fe-exec.c File Reference

#include "postgres_fe.h"
#include <ctype.h>
#include <fcntl.h>
#include <limits.h>
#include <unistd.h>
#include "common/int.h"
#include "libpq-fe.h"
#include "libpq-int.h"
#include "mb/pg_wchar.h"

Include dependency graph for fe-exec.c:

Go to the source code of this file.

Macros
#define	PGRESULT_DATA_BLOCKSIZE   2048
#define	PGRESULT_ALIGN_BOUNDARY   MAXIMUM_ALIGNOF /* from configure */
#define	PGRESULT_BLOCK_OVERHEAD   Max(sizeof(PGresult_data), PGRESULT_ALIGN_BOUNDARY)
#define	PGRESULT_SEP_ALLOC_THRESHOLD   (PGRESULT_DATA_BLOCKSIZE / 2)
#define	ISFIRSTOCTDIGIT(CH)   ((CH) >= '0' && (CH) <= '3')
#define	ISOCTDIGIT(CH)   ((CH) >= '0' && (CH) <= '7')
#define	OCTVAL(CH)   ((CH) - '0')

Functions
static PGEvent *	dupEvents (PGEvent *events, int count, size_t *memSize)
static bool	pqAddTuple (PGresult *res, PGresAttValue *tup, const char **errmsgp)
static int	PQsendQueryInternal (PGconn *conn, const char *query, bool newQuery)
static bool	PQsendQueryStart (PGconn *conn, bool newQuery)
static int	PQsendQueryGuts (PGconn *conn, const char *command, const char *stmtName, int nParams, const Oid *paramTypes, const char *const *paramValues, const int *paramLengths, const int *paramFormats, int resultFormat)
static void	parseInput (PGconn *conn)
static PGresult *	getCopyResult (PGconn *conn, ExecStatusType copytype)
static bool	PQexecStart (PGconn *conn)
static PGresult *	PQexecFinish (PGconn *conn)
static int	PQsendTypedCommand (PGconn *conn, char command, char type, const char *target)
static int	check_field_number (const PGresult *res, int field_num)
static void	pqPipelineProcessQueue (PGconn *conn)
static int	pqPipelineSyncInternal (PGconn *conn, bool immediate_flush)
static int	pqPipelineFlush (PGconn *conn)
PGresult *	PQmakeEmptyPGresult (PGconn *conn, ExecStatusType status)
int	PQsetResultAttrs (PGresult *res, int numAttributes, PGresAttDesc *attDescs)
PGresult *	PQcopyResult (const PGresult *src, int flags)
int	PQsetvalue (PGresult *res, int tup_num, int field_num, char *value, int len)
void *	PQresultAlloc (PGresult *res, size_t nBytes)
void *	pqResultAlloc (PGresult *res, size_t nBytes, bool isBinary)
size_t	PQresultMemorySize (const PGresult *res)
char *	pqResultStrdup (PGresult *res, const char *str)
void	pqSetResultError (PGresult *res, PQExpBuffer errorMessage, int offset)
void	PQclear (PGresult *res)
void	pqClearAsyncResult (PGconn *conn)
void	pqSaveErrorResult (PGconn *conn)
static void	pqSaveWriteError (PGconn *conn)
PGresult *	pqPrepareAsyncResult (PGconn *conn)
void	pqInternalNotice (const PGNoticeHooks *hooks, const char *fmt,...)
void	pqSaveMessageField (PGresult *res, char code, const char *value)
int	pqSaveParameterStatus (PGconn *conn, const char *name, const char *value)
int	pqRowProcessor (PGconn *conn, const char **errmsgp)
static PGcmdQueueEntry *	pqAllocCmdQueueEntry (PGconn *conn)
static void	pqAppendCmdQueueEntry (PGconn *conn, PGcmdQueueEntry *entry)
static void	pqRecycleCmdQueueEntry (PGconn *conn, PGcmdQueueEntry *entry)
int	PQsendQuery (PGconn *conn, const char *query)
int	PQsendQueryContinue (PGconn *conn, const char *query)
int	PQsendQueryParams (PGconn *conn, const char *command, int nParams, const Oid *paramTypes, const char *const *paramValues, const int *paramLengths, const int *paramFormats, int resultFormat)
int	PQsendPrepare (PGconn *conn, const char *stmtName, const char *query, int nParams, const Oid *paramTypes)
int	PQsendQueryPrepared (PGconn *conn, const char *stmtName, int nParams, const char *const *paramValues, const int *paramLengths, const int *paramFormats, int resultFormat)
static bool	canChangeResultMode (PGconn *conn)
int	PQsetSingleRowMode (PGconn *conn)
int	PQsetChunkedRowsMode (PGconn *conn, int chunkSize)
int	PQconsumeInput (PGconn *conn)
int	PQisBusy (PGconn *conn)
PGresult *	PQgetResult (PGconn *conn)
PGresult *	PQexec (PGconn *conn, const char *query)
PGresult *	PQexecParams (PGconn *conn, const char *command, int nParams, const Oid *paramTypes, const char *const *paramValues, const int *paramLengths, const int *paramFormats, int resultFormat)
PGresult *	PQprepare (PGconn *conn, const char *stmtName, const char *query, int nParams, const Oid *paramTypes)
PGresult *	PQexecPrepared (PGconn *conn, const char *stmtName, int nParams, const char *const *paramValues, const int *paramLengths, const int *paramFormats, int resultFormat)
PGresult *	PQdescribePrepared (PGconn *conn, const char *stmt)
PGresult *	PQdescribePortal (PGconn *conn, const char *portal)
int	PQsendDescribePrepared (PGconn *conn, const char *stmt)
int	PQsendDescribePortal (PGconn *conn, const char *portal)
PGresult *	PQclosePrepared (PGconn *conn, const char *stmt)
PGresult *	PQclosePortal (PGconn *conn, const char *portal)
int	PQsendClosePrepared (PGconn *conn, const char *stmt)
int	PQsendClosePortal (PGconn *conn, const char *portal)
PGnotify *	PQnotifies (PGconn *conn)
int	PQputCopyData (PGconn *conn, const char *buffer, int nbytes)
int	PQputCopyEnd (PGconn *conn, const char *errormsg)
int	PQgetCopyData (PGconn *conn, char **buffer, int async)
int	PQgetline (PGconn *conn, char *buffer, int length)
int	PQgetlineAsync (PGconn *conn, char *buffer, int bufsize)
int	PQputline (PGconn *conn, const char *string)
int	PQputnbytes (PGconn *conn, const char *buffer, int nbytes)
int	PQendcopy (PGconn *conn)
PGresult *	PQfn (PGconn *conn, int fnid, int *result_buf, int *result_len, int result_is_int, const PQArgBlock *args, int nargs)
int	PQenterPipelineMode (PGconn *conn)
int	PQexitPipelineMode (PGconn *conn)
void	pqCommandQueueAdvance (PGconn *conn, bool isReadyForQuery, bool gotSync)
int	PQpipelineSync (PGconn *conn)
int	PQsendPipelineSync (PGconn *conn)
int	PQsendFlushRequest (PGconn *conn)
ExecStatusType	PQresultStatus (const PGresult *res)
char *	PQresStatus (ExecStatusType status)
char *	PQresultErrorMessage (const PGresult *res)
char *	PQresultVerboseErrorMessage (const PGresult *res, PGVerbosity verbosity, PGContextVisibility show_context)
char *	PQresultErrorField (const PGresult *res, int fieldcode)
int	PQntuples (const PGresult *res)
int	PQnfields (const PGresult *res)
int	PQbinaryTuples (const PGresult *res)
static int	check_tuple_field_number (const PGresult *res, int tup_num, int field_num)
static int	check_param_number (const PGresult *res, int param_num)
char *	PQfname (const PGresult *res, int field_num)
int	PQfnumber (const PGresult *res, const char *field_name)
Oid	PQftable (const PGresult *res, int field_num)
int	PQftablecol (const PGresult *res, int field_num)
int	PQfformat (const PGresult *res, int field_num)
Oid	PQftype (const PGresult *res, int field_num)
int	PQfsize (const PGresult *res, int field_num)
int	PQfmod (const PGresult *res, int field_num)
char *	PQcmdStatus (PGresult *res)
char *	PQoidStatus (const PGresult *res)
Oid	PQoidValue (const PGresult *res)
char *	PQcmdTuples (PGresult *res)
char *	PQgetvalue (const PGresult *res, int tup_num, int field_num)
int	PQgetlength (const PGresult *res, int tup_num, int field_num)
int	PQgetisnull (const PGresult *res, int tup_num, int field_num)
int	PQnparams (const PGresult *res)
Oid	PQparamtype (const PGresult *res, int param_num)
int	PQsetnonblocking (PGconn *conn, int arg)
int	PQisnonblocking (const PGconn *conn)
int	PQisthreadsafe (void)
int	PQflush (PGconn *conn)
void	PQfreemem (void *ptr)
void	PQfreeNotify (PGnotify *notify)
static size_t	PQescapeStringInternal (PGconn *conn, char *to, const char *from, size_t length, int *error, int encoding, bool std_strings)
size_t	PQescapeStringConn (PGconn *conn, char *to, const char *from, size_t length, int *error)
size_t	PQescapeString (char *to, const char *from, size_t length)
static char *	PQescapeInternal (PGconn *conn, const char *str, size_t len, bool as_ident)
char *	PQescapeLiteral (PGconn *conn, const char *str, size_t len)
char *	PQescapeIdentifier (PGconn *conn, const char *str, size_t len)
static char	get_hex (char c)
static unsigned char *	PQescapeByteaInternal (PGconn *conn, const unsigned char *from, size_t from_length, size_t *to_length, bool std_strings, bool use_hex)
unsigned char *	PQescapeByteaConn (PGconn *conn, const unsigned char *from, size_t from_length, size_t *to_length)
unsigned char *	PQescapeBytea (const unsigned char *from, size_t from_length, size_t *to_length)
unsigned char *	PQunescapeBytea (const unsigned char *strtext, size_t *retbuflen)

Variables
char *const	pgresStatus []
static const PGresult	OOM_result
static int	static_client_encoding = PG_SQL_ASCII
static bool	static_std_strings = false
static const char	hextbl [] = "0123456789abcdef"
static const int8	hexlookup [128]

Macro Definition Documentation

ISFIRSTOCTDIGIT

#define ISFIRSTOCTDIGIT

(

CH

)

((CH) >= '0' && (CH) <= '3')

Definition at line 4600 of file fe-exec.c.

ISOCTDIGIT

#define ISOCTDIGIT

(

CH

)

((CH) >= '0' && (CH) <= '7')

Definition at line 4601 of file fe-exec.c.

OCTVAL

#define OCTVAL

(

CH

)

((CH) - '0')

Definition at line 4602 of file fe-exec.c.

PGRESULT_ALIGN_BOUNDARY

#define PGRESULT_ALIGN_BOUNDARY   MAXIMUM_ALIGNOF /* from configure */

Definition at line 144 of file fe-exec.c.

PGRESULT_BLOCK_OVERHEAD

#define PGRESULT_BLOCK_OVERHEAD   Max(sizeof(PGresult_data), PGRESULT_ALIGN_BOUNDARY)

Definition at line 145 of file fe-exec.c.

PGRESULT_DATA_BLOCKSIZE

#define PGRESULT_DATA_BLOCKSIZE   2048

Definition at line 143 of file fe-exec.c.

PGRESULT_SEP_ALLOC_THRESHOLD

#define PGRESULT_SEP_ALLOC_THRESHOLD   (PGRESULT_DATA_BLOCKSIZE / 2)

Definition at line 146 of file fe-exec.c.

Function Documentation

canChangeResultMode()

static bool canChangeResultMode ( PGconn *  conn )

static

Definition at line 1942 of file fe-exec.c.

{
    /*
     * Only allow changing the mode when we have launched a query and not yet
     * received any results.
     */
    if (!conn)
        return false;
    if (conn->asyncStatus != PGASYNC_BUSY)
        return false;
    if (!conn->cmd_queue_head ||
        (conn->cmd_queue_head->queryclass != PGQUERY_SIMPLE &&
         conn->cmd_queue_head->queryclass != PGQUERY_EXTENDED))
        return false;
    if (pgHavePendingResult(conn))
        return false;
    return true;
}

References pg_conn::asyncStatus, pg_conn::cmd_queue_head, conn, PGASYNC_BUSY, pgHavePendingResult, PGQUERY_EXTENDED, PGQUERY_SIMPLE, and PGcmdQueueEntry::queryclass.

Referenced by PQsetChunkedRowsMode(), and PQsetSingleRowMode().

check_field_number()

static int check_field_number ( const PGresult *  res, int  field_num  )

static

Definition at line 3527 of file fe-exec.c.

{
    if (!res)
        return false;           /* no way to display error message... */
    if (field_num < 0 || field_num >= res->numAttributes)
    {
        pqInternalNotice(&res->noticeHooks,
                         "column number %d is out of range 0..%d",
                         field_num, res->numAttributes - 1);
        return false;
    }
    return true;
}

References pg_result::noticeHooks, pg_result::numAttributes, and pqInternalNotice().

Referenced by PQfformat(), PQfmod(), PQfname(), PQfsize(), PQftable(), PQftablecol(), PQftype(), and PQsetvalue().

check_param_number()

static int check_param_number ( const PGresult *  res, int  param_num  )

static

Definition at line 3565 of file fe-exec.c.

{
    if (!res)
        return false;           /* no way to display error message... */
    if (param_num < 0 || param_num >= res->numParameters)
    {
        pqInternalNotice(&res->noticeHooks,
                         "parameter number %d is out of range 0..%d",
                         param_num, res->numParameters - 1);
        return false;
    }
 
    return true;
}

References pg_result::noticeHooks, pg_result::numParameters, and pqInternalNotice().

Referenced by PQparamtype().

check_tuple_field_number()

static int check_tuple_field_number ( const PGresult *  res, int  tup_num, int  field_num  )

static

Definition at line 3542 of file fe-exec.c.

{
    if (!res)
        return false;           /* no way to display error message... */
    if (tup_num < 0 || tup_num >= res->ntups)
    {
        pqInternalNotice(&res->noticeHooks,
                         "row number %d is out of range 0..%d",
                         tup_num, res->ntups - 1);
        return false;
    }
    if (field_num < 0 || field_num >= res->numAttributes)
    {
        pqInternalNotice(&res->noticeHooks,
                         "column number %d is out of range 0..%d",
                         field_num, res->numAttributes - 1);
        return false;
    }
    return true;
}

References pg_result::noticeHooks, pg_result::ntups, pg_result::numAttributes, and pqInternalNotice().

Referenced by PQgetisnull(), PQgetlength(), and PQgetvalue().

dupEvents()

static PGEvent * dupEvents ( PGEvent *  events, int  count, size_t *  memSize  )

static

Definition at line 409 of file fe-exec.c.

{
    PGEvent    *newEvents;
    size_t      msize;
    int         i;
 
    if (!events || count <= 0)
        return NULL;
 
    msize = count * sizeof(PGEvent);
    newEvents = (PGEvent *) malloc(msize);
    if (!newEvents)
        return NULL;
 
    for (i = 0; i < count; i++)
    {
        newEvents[i].proc = events[i].proc;
        newEvents[i].passThrough = events[i].passThrough;
        newEvents[i].data = NULL;
        newEvents[i].resultInitialized = false;
        newEvents[i].name = strdup(events[i].name);
        if (!newEvents[i].name)
        {
            while (--i >= 0)
                free(newEvents[i].name);
            free(newEvents);
            return NULL;
        }
        msize += strlen(events[i].name) + 1;
    }
 
    *memSize += msize;
    return newEvents;
}

References PGEvent::data, free, i, malloc, name, PGEvent::name, PGEvent::passThrough, PGEvent::proc, and PGEvent::resultInitialized.

Referenced by PQcopyResult(), and PQmakeEmptyPGresult().

get_hex()

static char get_hex ( char  c )

inlinestatic

Definition at line 4425 of file fe-exec.c.

{
    int         res = -1;
 
    if (c > 0 && c < 127)
        res = hexlookup[(unsigned char) c];
 
    return (char) res;
}

References hexlookup.

Referenced by PQunescapeBytea().

getCopyResult()

static PGresult * getCopyResult ( PGconn *  conn, ExecStatusType  copytype  )

static

Definition at line 2241 of file fe-exec.c.

{
    /*
     * If the server connection has been lost, don't pretend everything is
     * hunky-dory; instead return a PGRES_FATAL_ERROR result, and reset the
     * asyncStatus to idle (corresponding to what we'd do if we'd detected I/O
     * error in the earlier steps in PQgetResult).  The text returned in the
     * result is whatever is in conn->errorMessage; we hope that was filled
     * with something relevant when the lost connection was detected.
     */
    if (conn->status != CONNECTION_OK)
    {
        pqSaveErrorResult(conn);
        conn->asyncStatus = PGASYNC_IDLE;
        return pqPrepareAsyncResult(conn);
    }
 
    /* If we have an async result for the COPY, return that */
    if (conn->result && conn->result->resultStatus == copytype)
        return pqPrepareAsyncResult(conn);
 
    /* Otherwise, invent a suitable PGresult */
    return PQmakeEmptyPGresult(conn, copytype);
}

References pg_conn::asyncStatus, conn, CONNECTION_OK, PGASYNC_IDLE, PQmakeEmptyPGresult(), pqPrepareAsyncResult(), pqSaveErrorResult(), pg_conn::result, pg_result::resultStatus, and pg_conn::status.

Referenced by PQgetResult().

parseInput()

static void parseInput ( PGconn *  conn )

static

Definition at line 2037 of file fe-exec.c.

{
    pqParseInput3(conn);
}

References conn, and pqParseInput3().

Referenced by PQgetResult(), PQisBusy(), PQnotifies(), and PQputCopyData().

pqAddTuple()

static bool pqAddTuple ( PGresult *  res, PGresAttValue *  tup, const char **  errmsgp  )

static

Definition at line 999 of file fe-exec.c.

{
    if (res->ntups >= res->tupArrSize)
    {
        /*
         * Try to grow the array.
         *
         * We can use realloc because shallow copying of the structure is
         * okay. Note that the first time through, res->tuples is NULL. While
         * ANSI says that realloc() should act like malloc() in that case,
         * some old C libraries (like SunOS 4.1.x) coredump instead. On
         * failure realloc is supposed to return NULL without damaging the
         * existing allocation. Note that the positions beyond res->ntups are
         * garbage, not necessarily NULL.
         */
        int         newSize;
        PGresAttValue **newTuples;
 
        /*
         * Since we use integers for row numbers, we can't support more than
         * INT_MAX rows.  Make sure we allow that many, though.
         */
        if (res->tupArrSize <= INT_MAX / 2)
            newSize = (res->tupArrSize > 0) ? res->tupArrSize * 2 : 128;
        else if (res->tupArrSize < INT_MAX)
            newSize = INT_MAX;
        else
        {
            *errmsgp = libpq_gettext("PGresult cannot support more than INT_MAX tuples");
            return false;
        }
 
        /*
         * Also, on 32-bit platforms we could, in theory, overflow size_t even
         * before newSize gets to INT_MAX.  (In practice we'd doubtless hit
         * OOM long before that, but let's check.)
         */
#if INT_MAX >= (SIZE_MAX / 2)
        if (newSize > SIZE_MAX / sizeof(PGresAttValue *))
        {
            *errmsgp = libpq_gettext("size_t overflow");
            return false;
        }
#endif
 
        if (res->tuples == NULL)
            newTuples = (PGresAttValue **)
                malloc(newSize * sizeof(PGresAttValue *));
        else
            newTuples = (PGresAttValue **)
                realloc(res->tuples, newSize * sizeof(PGresAttValue *));
        if (!newTuples)
            return false;       /* malloc or realloc failed */
        res->memorySize +=
            (newSize - res->tupArrSize) * sizeof(PGresAttValue *);
        res->tupArrSize = newSize;
        res->tuples = newTuples;
    }
    res->tuples[res->ntups] = tup;
    res->ntups++;
    return true;
}

References if(), libpq_gettext, malloc, pg_result::memorySize, pg_result::ntups, realloc, pg_result::tupArrSize, and pg_result::tuples.

Referenced by pqRowProcessor(), and PQsetvalue().

pqAllocCmdQueueEntry()

static PGcmdQueueEntry * pqAllocCmdQueueEntry ( PGconn *  conn )

static

Definition at line 1323 of file fe-exec.c.

{
    PGcmdQueueEntry *entry;
 
    if (conn->cmd_queue_recycle == NULL)
    {
        entry = (PGcmdQueueEntry *) malloc(sizeof(PGcmdQueueEntry));
        if (entry == NULL)
        {
            libpq_append_conn_error(conn, "out of memory");
            return NULL;
        }
    }
    else
    {
        entry = conn->cmd_queue_recycle;
        conn->cmd_queue_recycle = entry->next;
    }
    entry->next = NULL;
    entry->query = NULL;
 
    return entry;
}

References pg_conn::cmd_queue_recycle, conn, libpq_append_conn_error(), malloc, PGcmdQueueEntry::next, and PGcmdQueueEntry::query.

Referenced by pqPipelineSyncInternal(), PQsendPrepare(), PQsendQueryGuts(), PQsendQueryInternal(), and PQsendTypedCommand().

pqAppendCmdQueueEntry()

static void pqAppendCmdQueueEntry ( PGconn *  conn, PGcmdQueueEntry *  entry  )

static

Definition at line 1356 of file fe-exec.c.

{
    Assert(entry->next == NULL);
 
    if (conn->cmd_queue_head == NULL)
        conn->cmd_queue_head = entry;
    else
        conn->cmd_queue_tail->next = entry;
 
    conn->cmd_queue_tail = entry;
 
    switch (conn->pipelineStatus)
    {
        case PQ_PIPELINE_OFF:
        case PQ_PIPELINE_ON:
 
            /*
             * When not in pipeline aborted state, if there's a result ready
             * to be consumed, let it be so (that is, don't change away from
             * READY or READY_MORE); otherwise set us busy to wait for
             * something to arrive from the server.
             */
            if (conn->asyncStatus == PGASYNC_IDLE)
                conn->asyncStatus = PGASYNC_BUSY;
            break;
 
        case PQ_PIPELINE_ABORTED:
 
            /*
             * In aborted pipeline state, we don't expect anything from the
             * server (since we don't send any queries that are queued).
             * Therefore, if IDLE then do what PQgetResult would do to let
             * itself consume commands from the queue; if we're in any other
             * state, we don't have to do anything.
             */
            if (conn->asyncStatus == PGASYNC_IDLE ||
                conn->asyncStatus == PGASYNC_PIPELINE_IDLE)
                pqPipelineProcessQueue(conn);
            break;
    }
}

References Assert(), pg_conn::asyncStatus, pg_conn::cmd_queue_head, pg_conn::cmd_queue_tail, conn, PGcmdQueueEntry::next, PGASYNC_BUSY, PGASYNC_IDLE, PGASYNC_PIPELINE_IDLE, pg_conn::pipelineStatus, PQ_PIPELINE_ABORTED, PQ_PIPELINE_OFF, PQ_PIPELINE_ON, and pqPipelineProcessQueue().

Referenced by pqPipelineSyncInternal(), PQsendPrepare(), PQsendQueryGuts(), PQsendQueryInternal(), and PQsendTypedCommand().

PQbinaryTuples()

int PQbinaryTuples

(

const PGresult *

res

)

Definition at line 3514 of file fe-exec.c.

{
    if (!res)
        return 0;
    return res->binary;
}

References pg_result::binary.

Referenced by HandleCopyResult().

PQclear()

void PQclear

(

PGresult *

res

)

Definition at line 727 of file fe-exec.c.

{
    PGresult_data *block;
    int         i;
 
    /* As a convenience, do nothing for a NULL pointer */
    if (!res)
        return;
    /* Also, do nothing if the argument is OOM_result */
    if ((const PGresult *) res == &OOM_result)
        return;
 
    /* Close down any events we may have */
    for (i = 0; i < res->nEvents; i++)
    {
        /* only send DESTROY to successfully-initialized event procs */
        if (res->events[i].resultInitialized)
        {
            PGEventResultDestroy evt;
 
            evt.result = res;
            (void) res->events[i].proc(PGEVT_RESULTDESTROY, &evt,
                                       res->events[i].passThrough);
        }
        free(res->events[i].name);
    }
 
    free(res->events);
 
    /* Free all the subsidiary blocks */
    while ((block = res->curBlock) != NULL)
    {
        res->curBlock = block->next;
        free(block);
    }
 
    /* Free the top-level tuple pointer array */
    free(res->tuples);
 
    /* zero out the pointer fields to catch programming errors */
    res->attDescs = NULL;
    res->tuples = NULL;
    res->paramDescs = NULL;
    res->errFields = NULL;
    res->events = NULL;
    res->nEvents = 0;
    /* res->curBlock was zeroed out earlier */
 
    /* Free the PGresult structure itself */
    free(res);
}

References pg_result::attDescs, pg_result::curBlock, pg_result::errFields, pg_result::events, free, i, PGEvent::name, pg_result::nEvents, pgresult_data::next, OOM_result, pg_result::paramDescs, PGEvent::passThrough, PGEVT_RESULTDESTROY, PGEvent::proc, PGEventResultDestroy::result, PGEvent::resultInitialized, and pg_result::tuples.

Referenced by pqClearAsyncResult(), PQcopyResult(), PQexecFinish(), PQexecStart(), pqInternalNotice(), and PQmakeEmptyPGresult().

pqClearAsyncResult()

void pqClearAsyncResult

(

PGconn *

conn

)

Definition at line 785 of file fe-exec.c.

{
    PQclear(conn->result);
    conn->result = NULL;
    conn->error_result = false;
    PQclear(conn->saved_result);
    conn->saved_result = NULL;
}

References conn, pg_conn::error_result, PQclear(), pg_conn::result, and pg_conn::saved_result.

Referenced by getAnotherTuple(), getParamDescriptions(), getRowDescriptions(), pqClosePGconn(), PQconnectPoll(), pqGetErrorNotice3(), pqPipelineProcessQueue(), pqSaveErrorResult(), and PQsendQueryStart().

PQclosePortal()

PGresult * PQclosePortal	(	PGconn *	conn,
		const char *	portal
	)

Definition at line 2556 of file fe-exec.c.

{
    if (!PQexecStart(conn))
        return NULL;
    if (!PQsendTypedCommand(conn, PqMsg_Close, 'P', portal))
        return NULL;
    return PQexecFinish(conn);
}

References conn, PQexecFinish(), PQexecStart(), PqMsg_Close, and PQsendTypedCommand().

Referenced by test_prepared().

PQclosePrepared()

PGresult * PQclosePrepared	(	PGconn *	conn,
		const char *	stmt
	)

Definition at line 2538 of file fe-exec.c.

{
    if (!PQexecStart(conn))
        return NULL;
    if (!PQsendTypedCommand(conn, PqMsg_Close, 'S', stmt))
        return NULL;
    return PQexecFinish(conn);
}

References conn, PQexecFinish(), PQexecStart(), PqMsg_Close, PQsendTypedCommand(), and stmt.

Referenced by test_prepared().

PQcmdStatus()

char * PQcmdStatus

(

PGresult *

res

)

Definition at line 3769 of file fe-exec.c.

{
    if (!res)
        return NULL;
    return res->cmdStatus;
}

References pg_result::cmdStatus.

PQcmdTuples()

char * PQcmdTuples

(

PGresult *

res

)

Definition at line 3839 of file fe-exec.c.

{
    char       *p,
               *c;
 
    if (!res)
        return "";
 
    if (strncmp(res->cmdStatus, "INSERT ", 7) == 0)
    {
        p = res->cmdStatus + 7;
        /* INSERT: skip oid and space */
        while (*p && *p != ' ')
            p++;
        if (*p == 0)
            goto interpret_error;   /* no space? */
        p++;
    }
    else if (strncmp(res->cmdStatus, "SELECT ", 7) == 0 ||
             strncmp(res->cmdStatus, "DELETE ", 7) == 0 ||
             strncmp(res->cmdStatus, "UPDATE ", 7) == 0)
        p = res->cmdStatus + 7;
    else if (strncmp(res->cmdStatus, "FETCH ", 6) == 0 ||
             strncmp(res->cmdStatus, "MERGE ", 6) == 0)
        p = res->cmdStatus + 6;
    else if (strncmp(res->cmdStatus, "MOVE ", 5) == 0 ||
             strncmp(res->cmdStatus, "COPY ", 5) == 0)
        p = res->cmdStatus + 5;
    else
        return "";
 
    /* check that we have an integer (at least one digit, nothing else) */
    for (c = p; *c; c++)
    {
        if (!isdigit((unsigned char) *c))
            goto interpret_error;
    }
    if (c == p)
        goto interpret_error;
 
    return p;
 
interpret_error:
    pqInternalNotice(&res->noticeHooks,
                     "could not interpret result from server: %s",
                     res->cmdStatus);
    return "";
}

References pg_result::cmdStatus, pg_result::noticeHooks, and pqInternalNotice().

pqCommandQueueAdvance()

void pqCommandQueueAdvance	(	PGconn *	conn,
		bool	isReadyForQuery,
		bool	gotSync
	)

Definition at line 3159 of file fe-exec.c.

{
    PGcmdQueueEntry *prevquery;
 
    if (conn->cmd_queue_head == NULL)
        return;
 
    /*
     * If processing a query of simple query protocol, we only advance the
     * queue when we receive the ReadyForQuery message for it.
     */
    if (conn->cmd_queue_head->queryclass == PGQUERY_SIMPLE && !isReadyForQuery)
        return;
 
    /*
     * If we're waiting for a SYNC, don't advance the queue until we get one.
     */
    if (conn->cmd_queue_head->queryclass == PGQUERY_SYNC && !gotSync)
        return;
 
    /* delink element from queue */
    prevquery = conn->cmd_queue_head;
    conn->cmd_queue_head = conn->cmd_queue_head->next;
 
    /* If the queue is now empty, reset the tail too */
    if (conn->cmd_queue_head == NULL)
        conn->cmd_queue_tail = NULL;
 
    /* and make the queue element recyclable */
    prevquery->next = NULL;
    pqRecycleCmdQueueEntry(conn, prevquery);
}

References pg_conn::cmd_queue_head, pg_conn::cmd_queue_tail, conn, PGcmdQueueEntry::next, PGQUERY_SIMPLE, PGQUERY_SYNC, pqRecycleCmdQueueEntry(), and PGcmdQueueEntry::queryclass.

Referenced by PQgetResult(), and pqParseInput3().

PQconsumeInput()

int PQconsumeInput

(

PGconn *

conn

)

Definition at line 2001 of file fe-exec.c.

{
    if (!conn)
        return 0;
 
    /*
     * for non-blocking connections try to flush the send-queue, otherwise we
     * may never get a response for something that may not have already been
     * sent because it's in our write buffer!
     */
    if (pqIsnonblocking(conn))
    {
        if (pqFlush(conn) < 0)
            return 0;
    }
 
    /*
     * Load more data, if available. We do this no matter what state we are
     * in, since we are probably getting called because the application wants
     * to get rid of a read-select condition. Note that we will NOT block
     * waiting for more input.
     */
    if (pqReadData(conn) < 0)
        return 0;
 
    /* Parsing of the data waits till later. */
    return 1;
}

References conn, pqFlush(), pqIsnonblocking, and pqReadData().

Referenced by advanceConnectionState(), consume_query_cancel_impl(), CopyStreamReceive(), dblink_get_notify(), dblink_is_busy(), do_sql_command_end(), ecpg_process_output(), libpqrcv_receive(), libpqsrv_get_result(), main(), pgfdw_cancel_query_end(), pgfdw_exec_cleanup_query_end(), pgfdw_get_cleanup_result(), postgresForeignAsyncNotify(), PQconnectPoll(), PrintNotifications(), process_slot(), StreamLogicalLog(), test_nosync(), test_pipelined_insert(), test_uniqviol(), try_complete_step(), and wait_on_slots().

PQcopyResult()

PGresult * PQcopyResult	(	const PGresult *	src,
		int	flags
	)

Definition at line 319 of file fe-exec.c.

{
    PGresult   *dest;
    int         i;
 
    if (!src)
        return NULL;
 
    dest = PQmakeEmptyPGresult(NULL, PGRES_TUPLES_OK);
    if (!dest)
        return NULL;
 
    /* Always copy these over.  Is cmdStatus really useful here? */
    dest->client_encoding = src->client_encoding;
    strcpy(dest->cmdStatus, src->cmdStatus);
 
    /* Wants attrs? */
    if (flags & (PG_COPYRES_ATTRS | PG_COPYRES_TUPLES))
    {
        if (!PQsetResultAttrs(dest, src->numAttributes, src->attDescs))
        {
            PQclear(dest);
            return NULL;
        }
    }
 
    /* Wants to copy tuples? */
    if (flags & PG_COPYRES_TUPLES)
    {
        int         tup,
                    field;
 
        for (tup = 0; tup < src->ntups; tup++)
        {
            for (field = 0; field < src->numAttributes; field++)
            {
                if (!PQsetvalue(dest, tup, field,
                                src->tuples[tup][field].value,
                                src->tuples[tup][field].len))
                {
                    PQclear(dest);
                    return NULL;
                }
            }
        }
    }
 
    /* Wants to copy notice hooks? */
    if (flags & PG_COPYRES_NOTICEHOOKS)
        dest->noticeHooks = src->noticeHooks;
 
    /* Wants to copy PGEvents? */
    if ((flags & PG_COPYRES_EVENTS) && src->nEvents > 0)
    {
        dest->events = dupEvents(src->events, src->nEvents,
                                 &dest->memorySize);
        if (!dest->events)
        {
            PQclear(dest);
            return NULL;
        }
        dest->nEvents = src->nEvents;
    }
 
    /* Okay, trigger PGEVT_RESULTCOPY event */
    for (i = 0; i < dest->nEvents; i++)
    {
        /* We don't fire events that had some previous failure */
        if (src->events[i].resultInitialized)
        {
            PGEventResultCopy evt;
 
            evt.src = src;
            evt.dest = dest;
            if (dest->events[i].proc(PGEVT_RESULTCOPY, &evt,
                                     dest->events[i].passThrough))
                dest->events[i].resultInitialized = true;
        }
    }
 
    return dest;
}

References pg_result::attDescs, pg_result::client_encoding, pg_result::cmdStatus, generate_unaccent_rules::dest, PGEventResultCopy::dest, dupEvents(), pg_result::events, i, pgresAttValue::len, pg_result::nEvents, pg_result::noticeHooks, pg_result::ntups, pg_result::numAttributes, PG_COPYRES_ATTRS, PG_COPYRES_EVENTS, PG_COPYRES_NOTICEHOOKS, PG_COPYRES_TUPLES, PGEVT_RESULTCOPY, PGRES_TUPLES_OK, PQclear(), PQmakeEmptyPGresult(), PQsetResultAttrs(), PQsetvalue(), PGEvent::resultInitialized, PGEventResultCopy::src, pg_result::tuples, and pgresAttValue::value.

Referenced by pqRowProcessor().

PQdescribePortal()

PGresult * PQdescribePortal	(	PGconn *	conn,
		const char *	portal
	)

Definition at line 2491 of file fe-exec.c.

{
    if (!PQexecStart(conn))
        return NULL;
    if (!PQsendTypedCommand(conn, PqMsg_Describe, 'P', portal))
        return NULL;
    return PQexecFinish(conn);
}

References conn, PQexecFinish(), PQexecStart(), PqMsg_Describe, and PQsendTypedCommand().

Referenced by test_prepared().

PQdescribePrepared()

PGresult * PQdescribePrepared	(	PGconn *	conn,
		const char *	stmt
	)

Definition at line 2472 of file fe-exec.c.

{
    if (!PQexecStart(conn))
        return NULL;
    if (!PQsendTypedCommand(conn, PqMsg_Describe, 'S', stmt))
        return NULL;
    return PQexecFinish(conn);
}

References conn, PQexecFinish(), PQexecStart(), PqMsg_Describe, PQsendTypedCommand(), and stmt.

Referenced by DescribeQuery(), ECPGdescribe(), and test_prepared().

PQendcopy()

int PQendcopy

(

PGconn *

conn

)

Definition at line 2966 of file fe-exec.c.

{
    if (!conn)
        return 0;
 
    return pqEndcopy3(conn);
}

References conn, and pqEndcopy3().

Referenced by ecpg_check_PQresult(), initPopulateTable(), libpqrcv_endstreaming(), and readCommandResponse().

PQenterPipelineMode()

int PQenterPipelineMode

(

PGconn *

conn

)

Definition at line 3059 of file fe-exec.c.

{
    if (!conn)
        return 0;
 
    /* succeed with no action if already in pipeline mode */
    if (conn->pipelineStatus != PQ_PIPELINE_OFF)
        return 1;
 
    if (conn->asyncStatus != PGASYNC_IDLE)
    {
        libpq_append_conn_error(conn, "cannot enter pipeline mode, connection not idle");
        return 0;
    }
 
    conn->pipelineStatus = PQ_PIPELINE_ON;
 
    return 1;
}

References pg_conn::asyncStatus, conn, libpq_append_conn_error(), PGASYNC_IDLE, pg_conn::pipelineStatus, PQ_PIPELINE_OFF, and PQ_PIPELINE_ON.

Referenced by ExecQueryAndProcessResults(), executeMetaCommand(), test_disallowed_in_pipeline(), test_multi_pipelines(), test_nosync(), test_pipeline_abort(), test_pipeline_idle(), test_pipelined_insert(), test_prepared(), test_simple_pipeline(), test_singlerowmode(), test_transaction(), and test_uniqviol().

PQescapeBytea()

unsigned char * PQescapeBytea	(	const unsigned char *	from,
		size_t	from_length,
		size_t *	to_length
	)

Definition at line 4592 of file fe-exec.c.

{
    return PQescapeByteaInternal(NULL, from, from_length, to_length,
                                 static_std_strings,
                                 false /* can't use hex */ );
}

References PQescapeByteaInternal(), and static_std_strings.

PQescapeByteaConn()

unsigned char * PQescapeByteaConn	(	PGconn *	conn,
		const unsigned char *	from,
		size_t	from_length,
		size_t *	to_length
	)

Definition at line 4576 of file fe-exec.c.

{
    if (!conn)
        return NULL;
 
    if (conn->cmd_queue_head == NULL)
        pqClearConnErrorState(conn);
 
    return PQescapeByteaInternal(conn, from, from_length, to_length,
                                 conn->std_strings,
                                 (conn->sversion >= 90000));
}

References pg_conn::cmd_queue_head, conn, pqClearConnErrorState, PQescapeByteaInternal(), pg_conn::std_strings, and pg_conn::sversion.

PQescapeByteaInternal()

static unsigned char * PQescapeByteaInternal ( PGconn *  conn, const unsigned char *  from, size_t  from_length, size_t *  to_length, bool  std_strings, bool  use_hex  )

static

Definition at line 4452 of file fe-exec.c.

{
    const unsigned char *vp;
    unsigned char *rp;
    unsigned char *result;
    size_t      i;
    size_t      len;
    const size_t bslash_len = (std_strings ? 1 : 2);
 
    /*
     * Calculate the escaped length, watching for overflow as we do with
     * PQescapeInternal(). The following code relies on a small constant
     * bslash_len so that small additions and multiplications don't need their
     * own overflow checks.
     *
     * Start with the empty string, which has 1 char ('\0').
     */
    len = 1;
 
    if (use_hex)
    {
        /* We prepend "\x" and double each input character. */
        if (pg_add_size_overflow(len, bslash_len + 1, &len) ||
            pg_add_size_overflow(len, from_length, &len) ||
            pg_add_size_overflow(len, from_length, &len))
            goto overflow;
    }
    else
    {
        vp = from;
        for (i = from_length; i > 0; i--, vp++)
        {
            if (*vp < 0x20 || *vp > 0x7e)
            {
                if (pg_add_size_overflow(len, bslash_len + 3, &len))    /* octal "\ooo" */
                    goto overflow;
            }
            else if (*vp == '\'')
            {
                if (pg_add_size_overflow(len, 2, &len)) /* double each quote */
                    goto overflow;
            }
            else if (*vp == '\\')
            {
                if (pg_add_size_overflow(len, bslash_len * 2, &len))    /* double each backslash */
                    goto overflow;
            }
            else
            {
                if (pg_add_size_overflow(len, 1, &len))
                    goto overflow;
            }
        }
    }
 
    *to_length = len;
    rp = result = (unsigned char *) malloc(len);
    if (rp == NULL)
    {
        if (conn)
            libpq_append_conn_error(conn, "out of memory");
        return NULL;
    }
 
    if (use_hex)
    {
        if (!std_strings)
            *rp++ = '\\';
        *rp++ = '\\';
        *rp++ = 'x';
    }
 
    vp = from;
    for (i = from_length; i > 0; i--, vp++)
    {
        unsigned char c = *vp;
 
        if (use_hex)
        {
            *rp++ = hextbl[(c >> 4) & 0xF];
            *rp++ = hextbl[c & 0xF];
        }
        else if (c < 0x20 || c > 0x7e)
        {
            if (!std_strings)
                *rp++ = '\\';
            *rp++ = '\\';
            *rp++ = (c >> 6) + '0';
            *rp++ = ((c >> 3) & 07) + '0';
            *rp++ = (c & 07) + '0';
        }
        else if (c == '\'')
        {
            *rp++ = '\'';
            *rp++ = '\'';
        }
        else if (c == '\\')
        {
            if (!std_strings)
            {
                *rp++ = '\\';
                *rp++ = '\\';
            }
            *rp++ = '\\';
            *rp++ = '\\';
        }
        else
            *rp++ = c;
    }
    *rp = '\0';
 
    return result;
 
overflow:
    if (conn)
        libpq_append_conn_error(conn,
                                "escaped bytea size exceeds the maximum allowed (%zu)",
                                SIZE_MAX);
    return NULL;
}

References conn, hextbl, i, len, libpq_append_conn_error(), malloc, and pg_add_size_overflow().

Referenced by PQescapeBytea(), and PQescapeByteaConn().

PQescapeIdentifier()

char * PQescapeIdentifier	(	PGconn *	conn,
		const char *	str,
		size_t	len
	)

Definition at line 4405 of file fe-exec.c.

{
    return PQescapeInternal(conn, str, len, true);
}

References conn, len, PQescapeInternal(), and str.

Referenced by create_publication(), create_subscription(), drop_publication(), enable_subscription(), escape_identifier(), initCreatePKeys(), initCreateTables(), main(), PQchangePassword(), psql_get_variable(), stringlist_to_identifierstr(), and vacuumlo().

PQescapeInternal()

static char * PQescapeInternal ( PGconn *  conn, const char *  str, size_t  len, bool  as_ident  )

static

Definition at line 4231 of file fe-exec.c.

{
    const char *s;
    char       *result;
    char       *rp;
    size_t      num_quotes = 0; /* single or double, depending on as_ident */
    size_t      num_backslashes = 0;
    size_t      input_len = strnlen(str, len);
    size_t      result_size;
    char        quote_char = as_ident ? '"' : '\'';
    bool        validated_mb = false;
 
    /* We must have a connection, else fail immediately. */
    if (!conn)
        return NULL;
 
    if (conn->cmd_queue_head == NULL)
        pqClearConnErrorState(conn);
 
    /*
     * Scan the string for characters that must be escaped and for invalidly
     * encoded data.
     */
    s = str;
    for (size_t remaining = input_len; remaining > 0; remaining--, s++)
    {
        if (*s == quote_char)
            ++num_quotes;
        else if (*s == '\\')
            ++num_backslashes;
        else if (IS_HIGHBIT_SET(*s))
        {
            int         charlen;
 
            /* Slow path for possible multibyte characters */
            charlen = pg_encoding_mblen_or_incomplete(conn->client_encoding,
                                                      s, remaining);
 
            if (charlen > remaining)
            {
                /* Multibyte character overruns allowable length. */
                libpq_append_conn_error(conn, "incomplete multibyte character");
                return NULL;
            }
 
            /*
             * If we haven't already, check that multibyte characters are
             * valid. It's important to verify that as invalid multi-byte
             * characters could e.g. be used to "skip" over quote characters,
             * e.g. when parsing character-by-character.
             *
             * We check validity once, for the whole remainder of the string,
             * when we first encounter any multi-byte character. Some
             * encodings have optimized implementations for longer strings.
             */
            if (!validated_mb)
            {
                if (pg_encoding_verifymbstr(conn->client_encoding, s, remaining)
                    != remaining)
                {
                    libpq_append_conn_error(conn, "invalid multibyte character");
                    return NULL;
                }
                validated_mb = true;
            }
 
            /* Adjust s, bearing in mind that for loop will increment it. */
            s += charlen - 1;
            remaining -= charlen - 1;
        }
    }
 
    /*
     * Allocate output buffer. Protect against overflow, in case the caller
     * has allocated a large fraction of the available size_t.
     */
    if (pg_add_size_overflow(input_len, num_quotes, &result_size) ||
        pg_add_size_overflow(result_size, 3, &result_size)) /* two quotes plus a NUL */
        goto overflow;
 
    if (!as_ident && num_backslashes > 0)
    {
        if (pg_add_size_overflow(result_size, num_backslashes, &result_size) ||
            pg_add_size_overflow(result_size, 2, &result_size)) /* for " E" prefix */
            goto overflow;
    }
 
    result = rp = (char *) malloc(result_size);
    if (rp == NULL)
    {
        libpq_append_conn_error(conn, "out of memory");
        return NULL;
    }
 
    /*
     * If we are escaping a literal that contains backslashes, we use the
     * escape string syntax so that the result is correct under either value
     * of standard_conforming_strings.  We also emit a leading space in this
     * case, to guard against the possibility that the result might be
     * interpolated immediately following an identifier.
     */
    if (!as_ident && num_backslashes > 0)
    {
        *rp++ = ' ';
        *rp++ = 'E';
    }
 
    /* Opening quote. */
    *rp++ = quote_char;
 
    /*
     * Use fast path if possible.
     *
     * We've already verified that the input string is well-formed in the
     * current encoding.  If it contains no quotes and, in the case of
     * literal-escaping, no backslashes, then we can just copy it directly to
     * the output buffer, adding the necessary quotes.
     *
     * If not, we must rescan the input and process each character
     * individually.
     */
    if (num_quotes == 0 && (num_backslashes == 0 || as_ident))
    {
        memcpy(rp, str, input_len);
        rp += input_len;
    }
    else
    {
        s = str;
        for (size_t remaining = input_len; remaining > 0; remaining--, s++)
        {
            if (*s == quote_char || (!as_ident && *s == '\\'))
            {
                *rp++ = *s;
                *rp++ = *s;
            }
            else if (!IS_HIGHBIT_SET(*s))
                *rp++ = *s;
            else
            {
                int         i = pg_encoding_mblen(conn->client_encoding, s);
 
                while (1)
                {
                    *rp++ = *s;
                    if (--i == 0)
                        break;
                    remaining--;
                    ++s;        /* for loop will provide the final increment */
                }
            }
        }
    }
 
    /* Closing quote and terminating NUL. */
    *rp++ = quote_char;
    *rp = '\0';
 
    return result;
 
overflow:
    libpq_append_conn_error(conn,
                            "escaped string size exceeds the maximum allowed (%zu)",
                            SIZE_MAX);
    return NULL;
}

References pg_conn::client_encoding, pg_conn::cmd_queue_head, conn, i, IS_HIGHBIT_SET, len, libpq_append_conn_error(), malloc, pg_add_size_overflow(), pg_encoding_mblen(), pg_encoding_mblen_or_incomplete(), pg_encoding_verifymbstr(), pqClearConnErrorState, remaining, str, and strnlen().

Referenced by PQescapeIdentifier(), and PQescapeLiteral().

PQescapeLiteral()

char * PQescapeLiteral	(	PGconn *	conn,
		const char *	str,
		size_t	len
	)

Definition at line 4399 of file fe-exec.c.

{
    return PQescapeInternal(conn, str, len, false);
}

References conn, len, PQescapeInternal(), and str.

Referenced by check_and_drop_existing_subscriptions(), create_logical_replication_slot(), create_publication(), create_subscription(), DescribeQuery(), drop_replication_slot(), escape_literal(), libpqrcv_startstreaming(), PQchangePassword(), psql_get_variable(), set_locale_and_encoding(), set_replication_progress(), and test_gb18030_page_multiple().

PQescapeString()

size_t PQescapeString	(	char *	to,
		const char *	from,
		size_t	length
	)

Definition at line 4216 of file fe-exec.c.

{
    return PQescapeStringInternal(NULL, to, from, length, NULL,
                                  static_client_encoding,
                                  static_std_strings);
}

References PQescapeStringInternal(), static_client_encoding, and static_std_strings.

Referenced by escape_string(), get_comma_elts(), and quote_postgres().

PQescapeStringConn()

size_t PQescapeStringConn	(	PGconn *	conn,
		char *	to,
		const char *	from,
		size_t	length,
		int *	error
	)

Definition at line 4194 of file fe-exec.c.

{
    if (!conn)
    {
        /* force empty-string result */
        *to = '\0';
        if (error)
            *error = 1;
        return 0;
    }
 
    if (conn->cmd_queue_head == NULL)
        pqClearConnErrorState(conn);
 
    return PQescapeStringInternal(conn, to, from, length, error,
                                  conn->client_encoding,
                                  conn->std_strings);
}

References pg_conn::client_encoding, pg_conn::cmd_queue_head, conn, error(), pqClearConnErrorState, PQescapeStringInternal(), and pg_conn::std_strings.

Referenced by AppendStringCommandOption(), appendStringLiteralConn(), check_loadable_libraries(), do_lo_import(), and escape_string_conn().

PQescapeStringInternal()

static size_t PQescapeStringInternal ( PGconn *  conn, char *  to, const char *  from, size_t  length, int *  error, int  encoding, bool  std_strings  )

static

Definition at line 4088 of file fe-exec.c.

{
    const char *source = from;
    char       *target = to;
    size_t      remaining = strnlen(from, length);
    bool        already_complained = false;
 
    if (error)
        *error = 0;
 
    while (remaining > 0)
    {
        char        c = *source;
        int         charlen;
        int         i;
 
        /* Fast path for plain ASCII */
        if (!IS_HIGHBIT_SET(c))
        {
            /* Apply quoting if needed */
            if (SQL_STR_DOUBLE(c, !std_strings))
                *target++ = c;
            /* Copy the character */
            *target++ = c;
            source++;
            remaining--;
            continue;
        }
 
        /* Slow path for possible multibyte characters */
        charlen = pg_encoding_mblen_or_incomplete(encoding,
                                                  source, remaining);
 
        if (remaining < charlen ||
            pg_encoding_verifymbchar(encoding, source, charlen) == -1)
        {
            /*
             * Multibyte character is invalid.  It's important to verify that
             * as invalid multibyte characters could e.g. be used to "skip"
             * over quote characters, e.g. when parsing
             * character-by-character.
             *
             * Report an error if possible, and replace the character's first
             * byte with an invalid sequence. The invalid sequence ensures
             * that the escaped string will trigger an error on the
             * server-side, even if we can't directly report an error here.
             *
             * This isn't *that* crucial when we can report an error to the
             * caller; but if we can't or the caller ignores it, the caller
             * will use this string unmodified and it needs to be safe for
             * parsing.
             *
             * We know there's enough space for the invalid sequence because
             * the "to" buffer needs to be at least 2 * length + 1 long, and
             * at worst we're replacing a single input byte with two invalid
             * bytes.
             *
             * It would be a bit faster to verify the whole string the first
             * time we encounter a set highbit, but this way we can replace
             * just the invalid data, which probably makes it easier for users
             * to find the invalidly encoded portion of a larger string.
             */
            if (error)
                *error = 1;
            if (conn && !already_complained)
            {
                if (remaining < charlen)
                    libpq_append_conn_error(conn, "incomplete multibyte character");
                else
                    libpq_append_conn_error(conn, "invalid multibyte character");
                /* Issue a complaint only once per string */
                already_complained = true;
            }
 
            pg_encoding_set_invalid(encoding, target);
            target += 2;
 
            /*
             * Handle the following bytes as if this byte didn't exist. That's
             * safer in case the subsequent bytes contain important characters
             * for the caller (e.g. '>' in html).
             */
            source++;
            remaining--;
        }
        else
        {
            /* Copy the character */
            for (i = 0; i < charlen; i++)
            {
                *target++ = *source++;
                remaining--;
            }
        }
    }
 
    /* Write the terminating NUL character. */
    *target = '\0';
 
    return target - to;
}

References conn, encoding, error(), i, IS_HIGHBIT_SET, libpq_append_conn_error(), pg_encoding_mblen_or_incomplete(), pg_encoding_set_invalid(), pg_encoding_verifymbchar(), remaining, source, SQL_STR_DOUBLE, and strnlen().

Referenced by PQescapeString(), and PQescapeStringConn().

PQexec()

PGresult * PQexec	(	PGconn *	conn,
		const char *	query
	)

Definition at line 2279 of file fe-exec.c.

{
    if (!PQexecStart(conn))
        return NULL;
    if (!PQsendQuery(conn, query))
        return NULL;
    return PQexecFinish(conn);
}

References conn, PQexecFinish(), PQexecStart(), and PQsendQuery().

Referenced by _doSetSessionAuth(), _printTableAccessMethodNoStorage(), _selectOutputSchema(), _selectTableAccessMethod(), _selectTablespace(), check_and_drop_existing_subscriptions(), check_and_drop_publications(), check_loadable_libraries(), check_prepare_conn(), check_publisher(), check_subscriber(), connect_database(), create_logical_replication_slot(), create_publication(), create_subscription(), CreateReplicationSlot(), deallocate_one(), DescribeQuery(), drop_existing_subscription(), drop_failover_replication_slots(), drop_publication(), drop_replication_slot(), DropReplicationSlot(), ecpg_autostart_transaction(), ecpg_execute(), ecpg_is_type_an_array(), ECPGsetcommit(), ECPGtrans(), enable_subscription(), executeCommand(), executeMaintenanceCommand(), executeQuery(), executeQueryOrDie(), ExecuteSqlCommand(), ExecuteSqlQuery(), ExecuteSqlStatement(), executeStatement(), generate_object_name(), get_create_object_cmd(), get_primary_sysid(), get_publisher_databases(), GetConnection(), GetSlotInformation(), GetTableInfo(), init_libpq_conn(), initPopulateTable(), libpq_traverse_files(), lo_initialize(), lockTableForWorker(), lookup_object_oid(), main(), PQchangePassword(), PQencryptPasswordConn(), PQsetClientEncoding(), PSQLexec(), ReceiveXlogStream(), RetrieveDataDirCreatePerm(), RetrieveWalSegSize(), run_permutation(), run_simple_command(), run_simple_query(), RunIdentifySystem(), SendQuery(), server_is_in_recovery(), set_replication_progress(), setup_publisher(), sql_conn(), sql_exec(), StreamLogicalLog(), test_disallowed_in_pipeline(), test_pipeline_abort(), test_prepared(), test_transaction(), test_uniqviol(), tryExecuteStatement(), and vacuumlo().

PQexecFinish()

static PGresult * PQexecFinish ( PGconn *  conn )

static

Definition at line 2427 of file fe-exec.c.

{
    PGresult   *result;
    PGresult   *lastResult;
 
    /*
     * For backwards compatibility, return the last result if there are more
     * than one.  (We used to have logic here to concatenate successive error
     * messages, but now that happens automatically, since conn->errorMessage
     * will continue to accumulate errors throughout this loop.)
     *
     * We have to stop if we see copy in/out/both, however. We will resume
     * parsing after application performs the data transfer.
     *
     * Also stop if the connection is lost (else we'll loop infinitely).
     */
    lastResult = NULL;
    while ((result = PQgetResult(conn)) != NULL)
    {
        PQclear(lastResult);
        lastResult = result;
        if (result->resultStatus == PGRES_COPY_IN ||
            result->resultStatus == PGRES_COPY_OUT ||
            result->resultStatus == PGRES_COPY_BOTH ||
            conn->status == CONNECTION_BAD)
            break;
    }
 
    return lastResult;
}

References conn, CONNECTION_BAD, PGRES_COPY_BOTH, PGRES_COPY_IN, PGRES_COPY_OUT, PQclear(), PQgetResult(), pg_result::resultStatus, and pg_conn::status.

Referenced by PQclosePortal(), PQclosePrepared(), PQdescribePortal(), PQdescribePrepared(), PQexec(), PQexecParams(), PQexecPrepared(), and PQprepare().

PQexecParams()

PGresult * PQexecParams	(	PGconn *	conn,
		const char *	command,
		int	nParams,
		const Oid *	paramTypes,
		const char *const *	paramValues,
		const int *	paramLengths,
		const int *	paramFormats,
		int	resultFormat
	)

Definition at line 2293 of file fe-exec.c.

{
    if (!PQexecStart(conn))
        return NULL;
    if (!PQsendQueryParams(conn, command,
                           nParams, paramTypes, paramValues, paramLengths,
                           paramFormats, resultFormat))
        return NULL;
    return PQexecFinish(conn);
}

References conn, PQexecFinish(), PQexecStart(), and PQsendQueryParams().

Referenced by ecpg_execute(), get_table_relkind(), libpq_fetch_file(), main(), and wait_for_connection_state().

PQexecPrepared()

PGresult * PQexecPrepared	(	PGconn *	conn,
		const char *	stmtName,
		int	nParams,
		const char *const *	paramValues,
		const int *	paramLengths,
		const int *	paramFormats,
		int	resultFormat
	)

Definition at line 2340 of file fe-exec.c.

{
    if (!PQexecStart(conn))
        return NULL;
    if (!PQsendQueryPrepared(conn, stmtName,
                             nParams, paramValues, paramLengths,
                             paramFormats, resultFormat))
        return NULL;
    return PQexecFinish(conn);
}

References conn, PQexecFinish(), PQexecStart(), and PQsendQueryPrepared().

Referenced by ecpg_execute(), and try_complete_step().

PQexecStart()

static bool PQexecStart ( PGconn *  conn )

static

Definition at line 2361 of file fe-exec.c.

{
    PGresult   *result;
 
    if (!conn)
        return false;
 
    /*
     * Since this is the beginning of a query cycle, reset the error state.
     * However, in pipeline mode with something already queued, the error
     * buffer belongs to that command and we shouldn't clear it.
     */
    if (conn->cmd_queue_head == NULL)
        pqClearConnErrorState(conn);
 
    if (conn->pipelineStatus != PQ_PIPELINE_OFF)
    {
        libpq_append_conn_error(conn, "synchronous command execution functions are not allowed in pipeline mode");
        return false;
    }
 
    /*
     * Silently discard any prior query result that application didn't eat.
     * This is probably poor design, but it's here for backward compatibility.
     */
    while ((result = PQgetResult(conn)) != NULL)
    {
        ExecStatusType resultStatus = result->resultStatus;
 
        PQclear(result);        /* only need its status */
        if (resultStatus == PGRES_COPY_IN)
        {
            /* get out of a COPY IN state */
            if (PQputCopyEnd(conn,
                             libpq_gettext("COPY terminated by new PQexec")) < 0)
                return false;
            /* keep waiting to swallow the copy's failure message */
        }
        else if (resultStatus == PGRES_COPY_OUT)
        {
            /*
             * Get out of a COPY OUT state: we just switch back to BUSY and
             * allow the remaining COPY data to be dropped on the floor.
             */
            conn->asyncStatus = PGASYNC_BUSY;
            /* keep waiting to swallow the copy's completion message */
        }
        else if (resultStatus == PGRES_COPY_BOTH)
        {
            /* We don't allow PQexec during COPY BOTH */
            libpq_append_conn_error(conn, "PQexec not allowed during COPY BOTH");
            return false;
        }
        /* check for loss of connection, too */
        if (conn->status == CONNECTION_BAD)
            return false;
    }
 
    /* OK to send a command */
    return true;
}

References pg_conn::asyncStatus, pg_conn::cmd_queue_head, conn, CONNECTION_BAD, libpq_append_conn_error(), libpq_gettext, PGASYNC_BUSY, PGRES_COPY_BOTH, PGRES_COPY_IN, PGRES_COPY_OUT, pg_conn::pipelineStatus, PQ_PIPELINE_OFF, PQclear(), pqClearConnErrorState, PQgetResult(), PQputCopyEnd(), pg_result::resultStatus, and pg_conn::status.

Referenced by PQclosePortal(), PQclosePrepared(), PQdescribePortal(), PQdescribePrepared(), PQexec(), PQexecParams(), PQexecPrepared(), and PQprepare().

PQexitPipelineMode()

int PQexitPipelineMode

(

PGconn *

conn

)

Definition at line 3090 of file fe-exec.c.

{
    if (!conn)
        return 0;
 
    if (conn->pipelineStatus == PQ_PIPELINE_OFF &&
        (conn->asyncStatus == PGASYNC_IDLE ||
         conn->asyncStatus == PGASYNC_PIPELINE_IDLE) &&
        conn->cmd_queue_head == NULL)
        return 1;
 
    switch (conn->asyncStatus)
    {
        case PGASYNC_READY:
        case PGASYNC_READY_MORE:
            /* there are some uncollected results */
            libpq_append_conn_error(conn, "cannot exit pipeline mode with uncollected results");
            return 0;
 
        case PGASYNC_BUSY:
            libpq_append_conn_error(conn, "cannot exit pipeline mode while busy");
            return 0;
 
        case PGASYNC_IDLE:
        case PGASYNC_PIPELINE_IDLE:
            /* OK */
            break;
 
        case PGASYNC_COPY_IN:
        case PGASYNC_COPY_OUT:
        case PGASYNC_COPY_BOTH:
            libpq_append_conn_error(conn, "cannot exit pipeline mode while in COPY");
    }
 
    /* still work to process */
    if (conn->cmd_queue_head != NULL)
    {
        libpq_append_conn_error(conn, "cannot exit pipeline mode with uncollected results");
        return 0;
    }
 
    conn->pipelineStatus = PQ_PIPELINE_OFF;
    conn->asyncStatus = PGASYNC_IDLE;
 
    /* Flush any pending data in out buffer */
    if (pqFlush(conn) < 0)
        return 0;               /* error message is setup already */
    return 1;
}

References pg_conn::asyncStatus, pg_conn::cmd_queue_head, conn, libpq_append_conn_error(), PGASYNC_BUSY, PGASYNC_COPY_BOTH, PGASYNC_COPY_IN, PGASYNC_COPY_OUT, PGASYNC_IDLE, PGASYNC_PIPELINE_IDLE, PGASYNC_READY, PGASYNC_READY_MORE, pg_conn::pipelineStatus, PQ_PIPELINE_OFF, and pqFlush().

Referenced by discardUntilSync(), ExecQueryAndProcessResults(), readCommandResponse(), test_disallowed_in_pipeline(), test_multi_pipelines(), test_pipeline_abort(), test_pipeline_idle(), test_pipelined_insert(), test_prepared(), test_simple_pipeline(), test_singlerowmode(), and test_transaction().

PQfformat()

int PQfformat	(	const PGresult *	res,
		int	field_num
	)

Definition at line 3725 of file fe-exec.c.

{
    if (!check_field_number(res, field_num))
        return 0;
    if (res->attDescs)
        return res->attDescs[field_num].format;
    else
        return 0;
}

References pg_result::attDescs, check_field_number(), and pgresAttDesc::format.

Referenced by ecpg_get_data(), ecpg_store_result(), and process_queued_fetch_requests().

PQflush()

int PQflush

(

PGconn *

conn

)

Definition at line 4017 of file fe-exec.c.

{
    if (!conn || conn->status == CONNECTION_BAD)
        return -1;
    return pqFlush(conn);
}

References conn, CONNECTION_BAD, pqFlush(), and pg_conn::status.

Referenced by CheckCopyStreamStop(), ExecQueryAndProcessResults(), HandleEndOfCopyStream(), libpqrcv_endstreaming(), libpqrcv_send(), prepareToTerminate(), ProcessWALDataMsg(), sendFeedback(), test_nosync(), test_pipelined_insert(), and test_uniqviol().

PQfmod()

int PQfmod	(	const PGresult *	res,
		int	field_num
	)

Definition at line 3758 of file fe-exec.c.

{
    if (!check_field_number(res, field_num))
        return 0;
    if (res->attDescs)
        return res->attDescs[field_num].atttypmod;
    else
        return 0;
}

References pg_result::attDescs, pgresAttDesc::atttypmod, and check_field_number().

Referenced by DescribeQuery(), and ECPGget_desc().

PQfn()

PGresult * PQfn	(	PGconn *	conn,
		int	fnid,
		int *	result_buf,
		int *	result_len,
		int	result_is_int,
		const PQArgBlock *	args,
		int	nargs
	)

Definition at line 2997 of file fe-exec.c.

{
    *result_len = 0;
 
    if (!conn)
        return NULL;
 
    /*
     * Since this is the beginning of a query cycle, reset the error state.
     * However, in pipeline mode with something already queued, the error
     * buffer belongs to that command and we shouldn't clear it.
     */
    if (conn->cmd_queue_head == NULL)
        pqClearConnErrorState(conn);
 
    if (conn->pipelineStatus != PQ_PIPELINE_OFF)
    {
        libpq_append_conn_error(conn, "%s not allowed in pipeline mode", "PQfn");
        return NULL;
    }
 
    if (conn->sock == PGINVALID_SOCKET || conn->asyncStatus != PGASYNC_IDLE ||
        pgHavePendingResult(conn))
    {
        libpq_append_conn_error(conn, "connection in wrong state");
        return NULL;
    }
 
    return pqFunctionCall3(conn, fnid,
                           result_buf, result_len,
                           result_is_int,
                           args, nargs);
}

References generate_unaccent_rules::args, pg_conn::asyncStatus, pg_conn::cmd_queue_head, conn, libpq_append_conn_error(), PGASYNC_IDLE, pgHavePendingResult, PGINVALID_SOCKET, pg_conn::pipelineStatus, PQ_PIPELINE_OFF, pqClearConnErrorState, pqFunctionCall3(), and pg_conn::sock.

Referenced by lo_close(), lo_creat(), lo_create(), lo_lseek(), lo_lseek64(), lo_open(), lo_read(), lo_tell(), lo_tell64(), lo_truncate(), lo_truncate64(), lo_unlink(), and lo_write().

PQfname()

char * PQfname	(	const PGresult *	res,
		int	field_num
	)

Definition at line 3584 of file fe-exec.c.

{
    if (!check_field_number(res, field_num))
        return NULL;
    if (res->attDescs)
        return res->attDescs[field_num].name;
    else
        return NULL;
}

References pg_result::attDescs, check_field_number(), and pgresAttDesc::name.

PQfnumber()

int PQfnumber	(	const PGresult *	res,
		const char *	field_name
	)

Definition at line 3606 of file fe-exec.c.

{
    char       *field_case;
    bool        in_quotes;
    bool        all_lower = true;
    const char *iptr;
    char       *optr;
    int         i;
 
    if (!res)
        return -1;
 
    /*
     * Note: it is correct to reject a zero-length input string; the proper
     * input to match a zero-length field name would be "".
     */
    if (field_name == NULL ||
        field_name[0] == '\0' ||
        res->attDescs == NULL)
        return -1;
 
    /*
     * Check if we can avoid the strdup() and related work because the
     * passed-in string wouldn't be changed before we do the check anyway.
     */
    for (iptr = field_name; *iptr; iptr++)
    {
        char        c = *iptr;
 
        if (c == '"' || c != pg_tolower((unsigned char) c))
        {
            all_lower = false;
            break;
        }
    }
 
    if (all_lower)
        for (i = 0; i < res->numAttributes; i++)
            if (strcmp(field_name, res->attDescs[i].name) == 0)
                return i;
 
    /* Fall through to the normal check if that didn't work out. */
 
    /*
     * Note: this code will not reject partially quoted strings, eg
     * foo"BAR"foo will become fooBARfoo when it probably ought to be an error
     * condition.
     */
    field_case = strdup(field_name);
    if (field_case == NULL)
        return -1;              /* grotty */
 
    in_quotes = false;
    optr = field_case;
    for (iptr = field_case; *iptr; iptr++)
    {
        char        c = *iptr;
 
        if (in_quotes)
        {
            if (c == '"')
            {
                if (iptr[1] == '"')
                {
                    /* doubled quotes become a single quote */
                    *optr++ = '"';
                    iptr++;
                }
                else
                    in_quotes = false;
            }
            else
                *optr++ = c;
        }
        else if (c == '"')
            in_quotes = true;
        else
        {
            c = pg_tolower((unsigned char) c);
            *optr++ = c;
        }
    }
    *optr = '\0';
 
    for (i = 0; i < res->numAttributes; i++)
    {
        if (strcmp(field_case, res->attDescs[i].name) == 0)
        {
            free(field_case);
            return i;
        }
    }
    free(field_case);
    return -1;
}

References pg_result::attDescs, free, i, pgresAttDesc::name, pg_result::numAttributes, and pg_tolower().

Referenced by append_depends_on_extension(), binary_upgrade_set_type_oids_by_type_oid(), buildMatViewRefreshDependencies(), check_for_connection_status(), check_for_pg_role_prefix(), check_new_cluster_replication_slots(), collectComments(), collectSecLabels(), describeOneTableDetails(), dropRoles(), dumpAgg(), dumpBaseType(), dumpCollation(), dumpCompositeType(), dumpCompositeTypeColComments(), dumpConversion(), dumpDatabase(), dumpDomain(), dumpEnumType(), dumpFunc(), dumpOpclass(), dumpOpfamily(), dumpOpr(), dumpRangeType(), dumpRelationStats_dumper(), dumpRoleMembership(), dumpRoles(), dumpTableSchema(), dumpTSConfig(), dumpUserMappings(), get_db_infos(), get_subscription_info(), get_tablespace_paths(), get_template0_info(), getAccessMethods(), getAggregates(), getCasts(), getCollations(), getConstraints(), getConversions(), getDefaultACLs(), getDependencies(), getDomainConstraints(), getEventTriggers(), getExtendedStatistics(), getExtensionMembership(), getExtensions(), getForeignDataWrappers(), getForeignServers(), getFuncs(), getIndexes(), getInherits(), getLOs(), getNamespaces(), getOpclasses(), getOperators(), getOpfamilies(), getPolicies(), getProcLangs(), getPublicationNamespaces(), getPublications(), getPublicationTables(), getRules(), getSubscriptionRelations(), getSubscriptions(), getTableAttrs(), getTables(), getTransforms(), getTriggers(), getTSConfigurations(), getTSDictionaries(), getTSParsers(), getTSTemplates(), getTypes(), old_9_6_invalidate_hash_indexes(), process_data_type_check(), process_extension_updates(), process_incompat_polymorphics(), process_inconsistent_notnull(), process_isn_and_int8_passing_mismatch(), process_old_cluster_logical_slot_infos(), process_old_sub_state_check(), process_rel_infos(), process_unicode_update(), process_user_defined_encoding_conversions(), process_user_defined_postfix_ops(), process_with_oids_check(), processExtensionTables(), set_frozenxids(), and show_binary_results().

PQfreemem()

void PQfreemem

(

void *

ptr

)

Definition at line 4049 of file fe-exec.c.

{
    free(ptr);
}

References free.

Referenced by check_and_drop_existing_subscriptions(), create_logical_replication_slot(), create_publication(), create_subscription(), dblink_get_notify(), DescribeQuery(), do_connect(), drop_publication(), drop_replication_slot(), dumpTableData_copy(), ecpg_process_output(), enable_subscription(), escape_identifier(), escape_literal(), exec_command_errverbose(), get_base_conninfo(), handleCopyOut(), HandleCopyStream(), initCreatePKeys(), initCreateTables(), libpqrcv_check_conninfo(), libpqrcv_disconnect(), libpqrcv_get_dbname_from_conninfo(), libpqrcv_receive(), libpqrcv_startstreaming(), main(), PQchangePassword(), PQfreeNotify(), PrintNotifications(), psql_get_variable(), ReceiveCopyData(), set_locale_and_encoding(), set_replication_progress(), StreamLogicalLog(), stringlist_to_identifierstr(), try_complete_step(), and vacuumlo().

PQfreeNotify()

void PQfreeNotify

(

PGnotify *

notify

)

Definition at line 4066 of file fe-exec.c.

{
    PQfreemem(notify);
}

References PQfreemem().

PQfsize()

int PQfsize	(	const PGresult *	res,
		int	field_num
	)

Definition at line 3747 of file fe-exec.c.

{
    if (!check_field_number(res, field_num))
        return 0;
    if (res->attDescs)
        return res->attDescs[field_num].typlen;
    else
        return 0;
}

References pg_result::attDescs, check_field_number(), and pgresAttDesc::typlen.

Referenced by ecpg_build_compat_sqlda(), and ECPGget_desc().

PQftable()

Oid PQftable	(	const PGresult *	res,
		int	field_num
	)

Definition at line 3703 of file fe-exec.c.

{
    if (!check_field_number(res, field_num))
        return InvalidOid;
    if (res->attDescs)
        return res->attDescs[field_num].tableid;
    else
        return InvalidOid;
}

References pg_result::attDescs, check_field_number(), InvalidOid, and pgresAttDesc::tableid.

PQftablecol()

int PQftablecol	(	const PGresult *	res,
		int	field_num
	)

Definition at line 3714 of file fe-exec.c.

{
    if (!check_field_number(res, field_num))
        return 0;
    if (res->attDescs)
        return res->attDescs[field_num].columnid;
    else
        return 0;
}

References pg_result::attDescs, check_field_number(), and pgresAttDesc::columnid.

PQftype()

Oid PQftype	(	const PGresult *	res,
		int	field_num
	)

Definition at line 3736 of file fe-exec.c.

{
    if (!check_field_number(res, field_num))
        return InvalidOid;
    if (res->attDescs)
        return res->attDescs[field_num].typid;
    else
        return InvalidOid;
}

References pg_result::attDescs, check_field_number(), InvalidOid, and pgresAttDesc::typid.

Referenced by DescribeQuery(), dumpTableData_insert(), ecpg_build_compat_sqlda(), ecpg_build_native_sqlda(), ecpg_store_result(), ECPGget_desc(), printCrosstab(), printQuery(), process_queued_fetch_requests(), sqlda_common_total_size(), and test_prepared().

PQgetCopyData()

int PQgetCopyData	(	PGconn *	conn,
		char **	buffer,
		int	async
	)

Definition at line 2833 of file fe-exec.c.

{
    *buffer = NULL;             /* for all failure cases */
    if (!conn)
        return -2;
    if (conn->asyncStatus != PGASYNC_COPY_OUT &&
        conn->asyncStatus != PGASYNC_COPY_BOTH)
    {
        libpq_append_conn_error(conn, "no COPY in progress");
        return -2;
    }
    return pqGetCopyData3(conn, buffer, async);
}

References pg_conn::asyncStatus, conn, libpq_append_conn_error(), PGASYNC_COPY_BOTH, PGASYNC_COPY_OUT, and pqGetCopyData3().

Referenced by CopyStreamReceive(), dumpTableData_copy(), ecpg_process_output(), handleCopyOut(), libpqrcv_receive(), ReceiveCopyData(), and StreamLogicalLog().

PQgetisnull()

int PQgetisnull	(	const PGresult *	res,
		int	tup_num,
		int	field_num
	)

Definition at line 3918 of file fe-exec.c.

{
    if (!check_tuple_field_number(res, tup_num, field_num))
        return 1;               /* pretend it is null */
    if (res->tuples[tup_num][field_num].len == NULL_LEN)
        return 1;
    else
        return 0;
}

References check_tuple_field_number(), pgresAttValue::len, NULL_LEN, and pg_result::tuples.

PQgetlength()

int PQgetlength	(	const PGresult *	res,
		int	tup_num,
		int	field_num
	)

Definition at line 3904 of file fe-exec.c.

{
    if (!check_tuple_field_number(res, tup_num, field_num))
        return 0;
    if (res->tuples[tup_num][field_num].len != NULL_LEN)
        return res->tuples[tup_num][field_num].len;
    else
        return 0;
}

References check_tuple_field_number(), pgresAttValue::len, NULL_LEN, and pg_result::tuples.

PQgetline()

int PQgetline	(	PGconn *	conn,
		char *	buffer,
		int	length
	)

Definition at line 2871 of file fe-exec.c.

{
    if (!buffer || length <= 0)
        return EOF;
    *buffer = '\0';
    /* length must be at least 3 to hold the \. terminator! */
    if (length < 3)
        return EOF;
 
    if (!conn)
        return EOF;
 
    return pqGetline3(conn, buffer, length);
}

References conn, and pqGetline3().

PQgetlineAsync()

int PQgetlineAsync	(	PGconn *	conn,
		char *	buffer,
		int	bufsize
	)

Definition at line 2918 of file fe-exec.c.

{
    if (!conn)
        return -1;
 
    return pqGetlineAsync3(conn, buffer, bufsize);
}

References bufsize, conn, and pqGetlineAsync3().

Referenced by pqGetline3().

PQgetResult()

PGresult * PQgetResult

(

PGconn *

conn

)

Definition at line 2079 of file fe-exec.c.

{
    PGresult   *res;
 
    if (!conn)
        return NULL;
 
    /* Parse any available data, if our state permits. */
    parseInput(conn);
 
    /* If not ready to return something, block until we are. */
    while (conn->asyncStatus == PGASYNC_BUSY)
    {
        int         flushResult;
 
        /*
         * If data remains unsent, send it.  Else we might be waiting for the
         * result of a command the backend hasn't even got yet.
         */
        while ((flushResult = pqFlush(conn)) > 0)
        {
            if (pqWait(false, true, conn))
            {
                flushResult = -1;
                break;
            }
        }
 
        /*
         * Wait for some more data, and load it.  (Note: if the connection has
         * been lost, pqWait should return immediately because the socket
         * should be read-ready, either with the last server data or with an
         * EOF indication.  We expect therefore that this won't result in any
         * undue delay in reporting a previous write failure.)
         */
        if (flushResult ||
            pqWait(true, false, conn) ||
            pqReadData(conn) < 0)
        {
            /* Report the error saved by pqWait or pqReadData */
            pqSaveErrorResult(conn);
            conn->asyncStatus = PGASYNC_IDLE;
            return pqPrepareAsyncResult(conn);
        }
 
        /* Parse it. */
        parseInput(conn);
 
        /*
         * If we had a write error, but nothing above obtained a query result
         * or detected a read error, report the write error.
         */
        if (conn->write_failed && conn->asyncStatus == PGASYNC_BUSY)
        {
            pqSaveWriteError(conn);
            conn->asyncStatus = PGASYNC_IDLE;
            return pqPrepareAsyncResult(conn);
        }
    }
 
    /* Return the appropriate thing. */
    switch (conn->asyncStatus)
    {
        case PGASYNC_IDLE:
            res = NULL;         /* query is complete */
            break;
        case PGASYNC_PIPELINE_IDLE:
            Assert(conn->pipelineStatus != PQ_PIPELINE_OFF);
 
            /*
             * We're about to return the NULL that terminates the round of
             * results from the current query; prepare to send the results of
             * the next query, if any, when we're called next.  If there's no
             * next element in the command queue, this gets us in IDLE state.
             */
            pqPipelineProcessQueue(conn);
            res = NULL;         /* query is complete */
            break;
 
        case PGASYNC_READY:
            res = pqPrepareAsyncResult(conn);
 
            /*
             * Normally pqPrepareAsyncResult will have left conn->result
             * empty.  Otherwise, "res" must be a not-full PGRES_TUPLES_CHUNK
             * result, which we want to return to the caller while staying in
             * PGASYNC_READY state.  Then the next call here will return the
             * empty PGRES_TUPLES_OK result that was restored from
             * saved_result, after which we can proceed.
             */
            if (conn->result)
            {
                Assert(res->resultStatus == PGRES_TUPLES_CHUNK);
                break;
            }
 
            /* Advance the queue as appropriate */
            pqCommandQueueAdvance(conn, false,
                                  res->resultStatus == PGRES_PIPELINE_SYNC);
 
            if (conn->pipelineStatus != PQ_PIPELINE_OFF)
            {
                /*
                 * We're about to send the results of the current query.  Set
                 * us idle now, and ...
                 */
                conn->asyncStatus = PGASYNC_PIPELINE_IDLE;
 
                /*
                 * ... in cases when we're sending a pipeline-sync result,
                 * move queue processing forwards immediately, so that next
                 * time we're called, we're prepared to return the next result
                 * received from the server.  In all other cases, leave the
                 * queue state change for next time, so that a terminating
                 * NULL result is sent.
                 *
                 * (In other words: we don't return a NULL after a pipeline
                 * sync.)
                 */
                if (res->resultStatus == PGRES_PIPELINE_SYNC)
                    pqPipelineProcessQueue(conn);
            }
            else
            {
                /* Set the state back to BUSY, allowing parsing to proceed. */
                conn->asyncStatus = PGASYNC_BUSY;
            }
            break;
        case PGASYNC_READY_MORE:
            res = pqPrepareAsyncResult(conn);
            /* Set the state back to BUSY, allowing parsing to proceed. */
            conn->asyncStatus = PGASYNC_BUSY;
            break;
        case PGASYNC_COPY_IN:
            res = getCopyResult(conn, PGRES_COPY_IN);
            break;
        case PGASYNC_COPY_OUT:
            res = getCopyResult(conn, PGRES_COPY_OUT);
            break;
        case PGASYNC_COPY_BOTH:
            res = getCopyResult(conn, PGRES_COPY_BOTH);
            break;
        default:
            libpq_append_conn_error(conn, "unexpected asyncStatus: %d", (int) conn->asyncStatus);
            pqSaveErrorResult(conn);
            conn->asyncStatus = PGASYNC_IDLE;   /* try to restore valid state */
            res = pqPrepareAsyncResult(conn);
            break;
    }
 
    /* Time to fire PGEVT_RESULTCREATE events, if there are any */
    if (res && res->nEvents > 0)
        (void) PQfireResultCreateEvents(conn, res);
 
    return res;
}

References Assert(), pg_conn::asyncStatus, conn, getCopyResult(), libpq_append_conn_error(), pg_result::nEvents, parseInput(), PGASYNC_BUSY, PGASYNC_COPY_BOTH, PGASYNC_COPY_IN, PGASYNC_COPY_OUT, PGASYNC_IDLE, PGASYNC_PIPELINE_IDLE, PGASYNC_READY, PGASYNC_READY_MORE, PGRES_COPY_BOTH, PGRES_COPY_IN, PGRES_COPY_OUT, PGRES_PIPELINE_SYNC, PGRES_TUPLES_CHUNK, pg_conn::pipelineStatus, PQ_PIPELINE_OFF, pqCommandQueueAdvance(), PQfireResultCreateEvents(), pqFlush(), pqPipelineProcessQueue(), pqPrepareAsyncResult(), pqReadData(), pqSaveErrorResult(), pqSaveWriteError(), pqWait(), pg_conn::result, pg_result::resultStatus, and pg_conn::write_failed.

Referenced by PQexecFinish(), and PQexecStart().

PQgetvalue()

char * PQgetvalue	(	const PGresult *	res,
		int	tup_num,
		int	field_num
	)

Definition at line 3893 of file fe-exec.c.

{
    if (!check_tuple_field_number(res, tup_num, field_num))
        return NULL;
    return res->tuples[tup_num][field_num].value;
}

References check_tuple_field_number(), pg_result::tuples, and pgresAttValue::value.

pqInternalNotice()

void pqInternalNotice	(	const PGNoticeHooks *	hooks,
		const char *	fmt,
			...
	)

Definition at line 944 of file fe-exec.c.

{
    char        msgBuf[1024];
    va_list     args;
    PGresult   *res;
 
    if (hooks->noticeRec == NULL)
        return;                 /* nobody home to receive notice? */
 
    /* Format the message */
    va_start(args, fmt);
    vsnprintf(msgBuf, sizeof(msgBuf), libpq_gettext(fmt), args);
    va_end(args);
    msgBuf[sizeof(msgBuf) - 1] = '\0';  /* make real sure it's terminated */
 
    /* Make a PGresult to pass to the notice receiver */
    res = PQmakeEmptyPGresult(NULL, PGRES_NONFATAL_ERROR);
    if (!res)
        return;
    res->noticeHooks = *hooks;
 
    /*
     * Set up fields of notice.
     */
    pqSaveMessageField(res, PG_DIAG_MESSAGE_PRIMARY, msgBuf);
    pqSaveMessageField(res, PG_DIAG_SEVERITY, libpq_gettext("NOTICE"));
    pqSaveMessageField(res, PG_DIAG_SEVERITY_NONLOCALIZED, "NOTICE");
    /* XXX should provide a SQLSTATE too? */
 
    /*
     * Result text is always just the primary message + newline.  If we can't
     * allocate it, substitute "out of memory", as in pqSetResultError.
     */
    res->errMsg = (char *) pqResultAlloc(res, strlen(msgBuf) + 2, false);
    if (res->errMsg)
        sprintf(res->errMsg, "%s\n", msgBuf);
    else
        res->errMsg = libpq_gettext("out of memory\n");
 
    /*
     * Pass to receiver, then free it.
     */
    res->noticeHooks.noticeRec(res->noticeHooks.noticeRecArg, res);
    PQclear(res);
}

References generate_unaccent_rules::args, pg_result::errMsg, libpq_gettext, pg_result::noticeHooks, PGNoticeHooks::noticeRec, PGNoticeHooks::noticeRecArg, PG_DIAG_MESSAGE_PRIMARY, PG_DIAG_SEVERITY, PG_DIAG_SEVERITY_NONLOCALIZED, PGRES_NONFATAL_ERROR, PQclear(), PQmakeEmptyPGresult(), pqResultAlloc(), pqSaveMessageField(), sprintf, and vsnprintf.

Referenced by check_field_number(), check_param_number(), check_tuple_field_number(), PQcmdTuples(), pqEndcopy3(), pqGetInt(), pqParseInput3(), pqPutInt(), and PQsetvalue().

PQisBusy()

int PQisBusy

(

PGconn *

conn

)

Definition at line 2048 of file fe-exec.c.

{
    if (!conn)
        return false;
 
    /* Parse any available data, if our state permits. */
    parseInput(conn);
 
    /*
     * PQgetResult will return immediately in all states except BUSY.  Also,
     * if we've detected read EOF and dropped the connection, we can expect
     * that PQgetResult will fail immediately.  Note that we do *not* check
     * conn->write_failed here --- once that's become set, we know we have
     * trouble, but we need to keep trying to read until we have a complete
     * server message or detect read EOF.
     */
    return conn->asyncStatus == PGASYNC_BUSY && conn->status != CONNECTION_BAD;
}

References pg_conn::asyncStatus, conn, CONNECTION_BAD, parseInput(), PGASYNC_BUSY, and pg_conn::status.

Referenced by advanceConnectionState(), consume_query_cancel_impl(), dblink_is_busy(), libpqsrv_get_result(), pgfdw_get_cleanup_result(), PQconnectPoll(), pqEndcopy3(), process_slot(), test_disallowed_in_pipeline(), test_pipelined_insert(), test_uniqviol(), try_complete_step(), and wait_on_slots().

PQisnonblocking()

int PQisnonblocking

(

const PGconn *

conn

)

Definition at line 4000 of file fe-exec.c.

{
    if (!conn || conn->status == CONNECTION_BAD)
        return false;
    return pqIsnonblocking(conn);
}

References conn, CONNECTION_BAD, pqIsnonblocking, and pg_conn::status.

Referenced by test_disallowed_in_pipeline(), and test_simple_pipeline().

PQisthreadsafe()

int PQisthreadsafe

(

void

)

Definition at line 4009 of file fe-exec.c.

{
    return true;
}

PQmakeEmptyPGresult()

PGresult * PQmakeEmptyPGresult	(	PGconn *	conn,
		ExecStatusType	status
	)

Definition at line 160 of file fe-exec.c.

{
    PGresult   *result;
 
    result = (PGresult *) malloc(sizeof(PGresult));
    if (!result)
        return NULL;
 
    result->ntups = 0;
    result->numAttributes = 0;
    result->attDescs = NULL;
    result->tuples = NULL;
    result->tupArrSize = 0;
    result->numParameters = 0;
    result->paramDescs = NULL;
    result->resultStatus = status;
    result->cmdStatus[0] = '\0';
    result->binary = 0;
    result->events = NULL;
    result->nEvents = 0;
    result->errMsg = NULL;
    result->errFields = NULL;
    result->errQuery = NULL;
    result->null_field[0] = '\0';
    result->curBlock = NULL;
    result->curOffset = 0;
    result->spaceLeft = 0;
    result->memorySize = sizeof(PGresult);
 
    if (conn)
    {
        /* copy connection data we might need for operations on PGresult */
        result->noticeHooks = conn->noticeHooks;
        result->client_encoding = conn->client_encoding;
 
        /* consider copying conn's errorMessage */
        switch (status)
        {
            case PGRES_EMPTY_QUERY:
            case PGRES_COMMAND_OK:
            case PGRES_TUPLES_OK:
            case PGRES_COPY_OUT:
            case PGRES_COPY_IN:
            case PGRES_COPY_BOTH:
            case PGRES_SINGLE_TUPLE:
            case PGRES_TUPLES_CHUNK:
                /* non-error cases */
                break;
            default:
                /* we intentionally do not use or modify errorReported here */
                pqSetResultError(result, &conn->errorMessage, 0);
                break;
        }
 
        /* copy events last; result must be valid if we need to PQclear */
        if (conn->nEvents > 0)
        {
            result->events = dupEvents(conn->events, conn->nEvents,
                                       &result->memorySize);
            if (!result->events)
            {
                PQclear(result);
                return NULL;
            }
            result->nEvents = conn->nEvents;
        }
    }
    else
    {
        /* defaults... */
        result->noticeHooks.noticeRec = NULL;
        result->noticeHooks.noticeRecArg = NULL;
        result->noticeHooks.noticeProc = NULL;
        result->noticeHooks.noticeProcArg = NULL;
        result->client_encoding = PG_SQL_ASCII;
    }
 
    return result;
}

References pg_result::attDescs, pg_result::binary, pg_result::client_encoding, pg_conn::client_encoding, pg_result::cmdStatus, conn, pg_result::curBlock, pg_result::curOffset, dupEvents(), pg_result::errFields, pg_result::errMsg, pg_conn::errorMessage, pg_result::errQuery, pg_result::events, pg_conn::events, malloc, pg_result::memorySize, pg_result::nEvents, pg_conn::nEvents, pg_result::noticeHooks, pg_conn::noticeHooks, PGNoticeHooks::noticeProc, PGNoticeHooks::noticeProcArg, PGNoticeHooks::noticeRec, PGNoticeHooks::noticeRecArg, pg_result::ntups, pg_result::null_field, pg_result::numAttributes, pg_result::numParameters, pg_result::paramDescs, PG_SQL_ASCII, PGRES_COMMAND_OK, PGRES_COPY_BOTH, PGRES_COPY_IN, PGRES_COPY_OUT, PGRES_EMPTY_QUERY, PGRES_SINGLE_TUPLE, PGRES_TUPLES_CHUNK, PGRES_TUPLES_OK, PQclear(), pqSetResultError(), pg_result::resultStatus, pg_result::spaceLeft, pg_result::tupArrSize, and pg_result::tuples.

Referenced by ECPGallocate_desc(), getCopyResult(), getCopyStart(), getParamDescriptions(), getRowDescriptions(), PQcopyResult(), pqFunctionCall3(), pqGetErrorNotice3(), pqInternalNotice(), pqParseInput3(), pqPipelineProcessQueue(), and pqPrepareAsyncResult().

PQnfields()

int PQnfields

(

const PGresult *

res

)

Definition at line 3506 of file fe-exec.c.

{
    if (!res)
        return 0;
    return res->numAttributes;
}

References pg_result::numAttributes.

PQnotifies()

PGnotify * PQnotifies

(

PGconn *

conn

)

Definition at line 2684 of file fe-exec.c.

{
    PGnotify   *event;
 
    if (!conn)
        return NULL;
 
    /* Parse any available data to see if we can extract NOTIFY messages. */
    parseInput(conn);
 
    event = conn->notifyHead;
    if (event)
    {
        conn->notifyHead = event->next;
        if (!conn->notifyHead)
            conn->notifyTail = NULL;
        event->next = NULL;     /* don't let app see the internal state */
    }
    return event;
}

References conn, pgNotify::next, pg_conn::notifyHead, pg_conn::notifyTail, and parseInput().

Referenced by dblink_get_notify(), ecpg_process_output(), main(), PrintNotifications(), and try_complete_step().

PQnparams()

int PQnparams

(

const PGresult *

res

)

Definition at line 3932 of file fe-exec.c.

{
    if (!res)
        return 0;
    return res->numParameters;
}

References pg_result::numParameters.

PQntuples()

int PQntuples

(

const PGresult *

res

)

Definition at line 3498 of file fe-exec.c.

{
    if (!res)
        return 0;
    return res->ntups;
}

References pg_result::ntups.

PQoidStatus()

char * PQoidStatus

(

const PGresult *

res

)

Definition at line 3782 of file fe-exec.c.

{
    /*
     * This must be enough to hold the result. Don't laugh, this is better
     * than what this function used to do.
     */
    static char buf[24];
 
    size_t      len;
 
    if (!res || strncmp(res->cmdStatus, "INSERT ", 7) != 0)
        return "";
 
    len = strspn(res->cmdStatus + 7, "0123456789");
    if (len > sizeof(buf) - 1)
        len = sizeof(buf) - 1;
    memcpy(buf, res->cmdStatus + 7, len);
    buf[len] = '\0';
 
    return buf;
}

References buf, pg_result::cmdStatus, and len.

PQoidValue()

Oid PQoidValue

(

const PGresult *

res

)

Definition at line 3810 of file fe-exec.c.

{
    char       *endptr = NULL;
    unsigned long result;
 
    if (!res ||
        strncmp(res->cmdStatus, "INSERT ", 7) != 0 ||
        res->cmdStatus[7] < '0' ||
        res->cmdStatus[7] > '9')
        return InvalidOid;
 
    result = strtoul(res->cmdStatus + 7, &endptr, 10);
 
    if (!endptr || (*endptr != ' ' && *endptr != '\0'))
        return InvalidOid;
    else
        return (Oid) result;
}

References pg_result::cmdStatus, and InvalidOid.

Referenced by ecpg_process_output(), and PrintQueryStatus().

PQparamtype()

Oid PQparamtype	(	const PGresult *	res,
		int	param_num
	)

Definition at line 3943 of file fe-exec.c.

{
    if (!check_param_number(res, param_num))
        return InvalidOid;
    if (res->paramDescs)
        return res->paramDescs[param_num].typid;
    else
        return InvalidOid;
}

References check_param_number(), InvalidOid, pg_result::paramDescs, and pgresParamDesc::typid.

pqPipelineFlush()

static int pqPipelineFlush ( PGconn *  conn )

static

Definition at line 4033 of file fe-exec.c.

{
    if ((conn->pipelineStatus != PQ_PIPELINE_ON) ||
        (conn->outCount >= OUTBUFFER_THRESHOLD))
        return pqFlush(conn);
    return 0;
}

References conn, OUTBUFFER_THRESHOLD, pg_conn::outCount, pg_conn::pipelineStatus, PQ_PIPELINE_ON, and pqFlush().

Referenced by pqPipelineSyncInternal(), PQsendFlushRequest(), PQsendPrepare(), PQsendQueryGuts(), and PQsendTypedCommand().

pqPipelineProcessQueue()

static void pqPipelineProcessQueue ( PGconn *  conn )

static

Definition at line 3197 of file fe-exec.c.

{
    switch (conn->asyncStatus)
    {
        case PGASYNC_COPY_IN:
        case PGASYNC_COPY_OUT:
        case PGASYNC_COPY_BOTH:
        case PGASYNC_READY:
        case PGASYNC_READY_MORE:
        case PGASYNC_BUSY:
            /* client still has to process current query or results */
            return;
 
        case PGASYNC_IDLE:
 
            /*
             * If we're in IDLE mode and there's some command in the queue,
             * get us into PIPELINE_IDLE mode and process normally.  Otherwise
             * there's nothing for us to do.
             */
            if (conn->cmd_queue_head != NULL)
            {
                conn->asyncStatus = PGASYNC_PIPELINE_IDLE;
                break;
            }
            return;
 
        case PGASYNC_PIPELINE_IDLE:
            Assert(conn->pipelineStatus != PQ_PIPELINE_OFF);
            /* next query please */
            break;
    }
 
    /*
     * Reset partial-result mode.  (Client has to set it up for each query, if
     * desired.)
     */
    conn->partialResMode = false;
    conn->singleRowMode = false;
    conn->maxChunkSize = 0;
 
    /*
     * If there are no further commands to process in the queue, get us in
     * "real idle" mode now.
     */
    if (conn->cmd_queue_head == NULL)
    {
        conn->asyncStatus = PGASYNC_IDLE;
        return;
    }
 
    /*
     * Reset the error state.  This and the next couple of steps correspond to
     * what PQsendQueryStart didn't do for this query.
     */
    pqClearConnErrorState(conn);
 
    /* Initialize async result-accumulation state */
    pqClearAsyncResult(conn);
 
    if (conn->pipelineStatus == PQ_PIPELINE_ABORTED &&
        conn->cmd_queue_head->queryclass != PGQUERY_SYNC)
    {
        /*
         * In an aborted pipeline we don't get anything from the server for
         * each result; we're just discarding commands from the queue until we
         * get to the next sync from the server.
         *
         * The PGRES_PIPELINE_ABORTED results tell the client that its queries
         * got aborted.
         */
        conn->result = PQmakeEmptyPGresult(conn, PGRES_PIPELINE_ABORTED);
        if (!conn->result)
        {
            libpq_append_conn_error(conn, "out of memory");
            pqSaveErrorResult(conn);
            return;
        }
        conn->asyncStatus = PGASYNC_READY;
    }
    else
    {
        /* allow parsing to continue */
        conn->asyncStatus = PGASYNC_BUSY;
    }
}

References Assert(), pg_conn::asyncStatus, pg_conn::cmd_queue_head, conn, libpq_append_conn_error(), pg_conn::maxChunkSize, pg_conn::partialResMode, PGASYNC_BUSY, PGASYNC_COPY_BOTH, PGASYNC_COPY_IN, PGASYNC_COPY_OUT, PGASYNC_IDLE, PGASYNC_PIPELINE_IDLE, PGASYNC_READY, PGASYNC_READY_MORE, PGQUERY_SYNC, PGRES_PIPELINE_ABORTED, pg_conn::pipelineStatus, PQ_PIPELINE_ABORTED, PQ_PIPELINE_OFF, pqClearAsyncResult(), pqClearConnErrorState, PQmakeEmptyPGresult(), pqSaveErrorResult(), PGcmdQueueEntry::queryclass, pg_conn::result, and pg_conn::singleRowMode.

Referenced by pqAppendCmdQueueEntry(), and PQgetResult().

PQpipelineSync()

int PQpipelineSync

(

PGconn *

conn

)

Definition at line 3289 of file fe-exec.c.

{
    return pqPipelineSyncInternal(conn, true);
}

References conn, and pqPipelineSyncInternal().

Referenced by discardUntilSync(), ExecQueryAndProcessResults(), executeMetaCommand(), test_multi_pipelines(), test_pipeline_abort(), test_pipelined_insert(), test_prepared(), test_simple_pipeline(), test_singlerowmode(), and test_transaction().

pqPipelineSyncInternal()

static int pqPipelineSyncInternal ( PGconn *  conn, bool  immediate_flush  )

static

Definition at line 3311 of file fe-exec.c.

{
    PGcmdQueueEntry *entry;
 
    if (!conn)
        return 0;
 
    if (conn->pipelineStatus == PQ_PIPELINE_OFF)
    {
        libpq_append_conn_error(conn, "cannot send pipeline when not in pipeline mode");
        return 0;
    }
 
    switch (conn->asyncStatus)
    {
        case PGASYNC_COPY_IN:
        case PGASYNC_COPY_OUT:
        case PGASYNC_COPY_BOTH:
            /* should be unreachable */
            appendPQExpBufferStr(&conn->errorMessage,
                                 "internal error: cannot send pipeline while in COPY\n");
            return 0;
        case PGASYNC_READY:
        case PGASYNC_READY_MORE:
        case PGASYNC_BUSY:
        case PGASYNC_IDLE:
        case PGASYNC_PIPELINE_IDLE:
            /* OK to send sync */
            break;
    }
 
    entry = pqAllocCmdQueueEntry(conn);
    if (entry == NULL)
        return 0;               /* error msg already set */
 
    entry->queryclass = PGQUERY_SYNC;
    entry->query = NULL;
 
    /* construct the Sync message */
    if (pqPutMsgStart(PqMsg_Sync, conn) < 0 ||
        pqPutMsgEnd(conn) < 0)
        goto sendFailed;
 
    /*
     * Give the data a push.  In nonblock mode, don't complain if we're unable
     * to send it all; PQgetResult() will do any additional flushing needed.
     * If immediate_flush is disabled, the data is pushed if we are past the
     * size threshold.
     */
    if (immediate_flush)
    {
        if (pqFlush(conn) < 0)
            goto sendFailed;
    }
    else
    {
        if (pqPipelineFlush(conn) < 0)
            goto sendFailed;
    }
 
    /* OK, it's launched! */
    pqAppendCmdQueueEntry(conn, entry);
 
    return 1;
 
sendFailed:
    pqRecycleCmdQueueEntry(conn, entry);
    /* error message should be set up already */
    return 0;
}

References appendPQExpBufferStr(), pg_conn::asyncStatus, conn, pg_conn::errorMessage, libpq_append_conn_error(), PGASYNC_BUSY, PGASYNC_COPY_BOTH, PGASYNC_COPY_IN, PGASYNC_COPY_OUT, PGASYNC_IDLE, PGASYNC_PIPELINE_IDLE, PGASYNC_READY, PGASYNC_READY_MORE, PGQUERY_SYNC, pg_conn::pipelineStatus, PQ_PIPELINE_OFF, pqAllocCmdQueueEntry(), pqAppendCmdQueueEntry(), pqFlush(), PqMsg_Sync, pqPipelineFlush(), pqPutMsgEnd(), pqPutMsgStart(), pqRecycleCmdQueueEntry(), PGcmdQueueEntry::query, and PGcmdQueueEntry::queryclass.

Referenced by PQpipelineSync(), and PQsendPipelineSync().

PQprepare()

PGresult * PQprepare	(	PGconn *	conn,
		const char *	stmtName,
		const char *	query,
		int	nParams,
		const Oid *	paramTypes
	)

Definition at line 2323 of file fe-exec.c.

{
    if (!PQexecStart(conn))
        return NULL;
    if (!PQsendPrepare(conn, stmtName, query, nParams, paramTypes))
        return NULL;
    return PQexecFinish(conn);
}

References conn, PQexecFinish(), PQexecStart(), and PQsendPrepare().

Referenced by DescribeQuery(), init_libpq_conn(), main(), prepare_common(), prepareCommand(), and test_uniqviol().

pqPrepareAsyncResult()

PGresult * pqPrepareAsyncResult

(

PGconn *

conn

)

Definition at line 857 of file fe-exec.c.

{
    PGresult   *res;
 
    res = conn->result;
    if (res)
    {
        /*
         * If the pre-existing result is an ERROR (presumably something
         * received from the server), assume that it represents whatever is in
         * conn->errorMessage, and advance errorReported.
         */
        if (res->resultStatus == PGRES_FATAL_ERROR)
            conn->errorReported = conn->errorMessage.len;
    }
    else
    {
        /*
         * We get here after internal-to-libpq errors.  We should probably
         * always have error_result = true, but if we don't, gin up some error
         * text.
         */
        if (!conn->error_result)
            libpq_append_conn_error(conn, "no error text available");
 
        /* Paranoia: be sure errorReported offset is sane */
        if (conn->errorReported < 0 ||
            conn->errorReported >= conn->errorMessage.len)
            conn->errorReported = 0;
 
        /*
         * Make a PGresult struct for the error.  We temporarily lie about the
         * result status, so that PQmakeEmptyPGresult doesn't uselessly copy
         * all of conn->errorMessage.
         */
        res = PQmakeEmptyPGresult(conn, PGRES_EMPTY_QUERY);
        if (res)
        {
            /*
             * Report whatever new error text we have, and advance
             * errorReported.
             */
            res->resultStatus = PGRES_FATAL_ERROR;
            pqSetResultError(res, &conn->errorMessage, conn->errorReported);
            conn->errorReported = conn->errorMessage.len;
        }
        else
        {
            /*
             * Ouch, not enough memory for a PGresult.  Fortunately, we have a
             * card up our sleeve: we can use the static OOM_result.  Casting
             * away const here is a bit ugly, but it seems best to declare
             * OOM_result as const, in hopes it will be allocated in read-only
             * storage.
             */
            res = unconstify(PGresult *, &OOM_result);
 
            /*
             * Don't advance errorReported.  Perhaps we'll be able to report
             * the text later.
             */
        }
    }
 
    /*
     * Replace conn->result with saved_result, if any.  In the normal case
     * there isn't a saved result and we're just dropping ownership of the
     * current result.  In partial-result mode this restores the situation to
     * what it was before we created the current partial result.
     */
    conn->result = conn->saved_result;
    conn->error_result = false; /* saved_result is never an error */
    conn->saved_result = NULL;
 
    return res;
}

References conn, pg_conn::error_result, pg_conn::errorMessage, pg_conn::errorReported, PQExpBufferData::len, libpq_append_conn_error(), OOM_result, PGRES_EMPTY_QUERY, PGRES_FATAL_ERROR, PQmakeEmptyPGresult(), pqSetResultError(), pg_conn::result, pg_result::resultStatus, pg_conn::saved_result, and unconstify.

Referenced by getCopyResult(), pqFunctionCall3(), and PQgetResult().

PQputCopyData()

int PQputCopyData	(	PGconn *	conn,
		const char *	buffer,
		int	nbytes
	)

Definition at line 2712 of file fe-exec.c.

{
    if (!conn)
        return -1;
    if (conn->asyncStatus != PGASYNC_COPY_IN &&
        conn->asyncStatus != PGASYNC_COPY_BOTH)
    {
        libpq_append_conn_error(conn, "no COPY in progress");
        return -1;
    }
 
    /*
     * Process any NOTICE or NOTIFY messages that might be pending in the
     * input buffer.  Since the server might generate many notices during the
     * COPY, we want to clean those out reasonably promptly to prevent
     * indefinite expansion of the input buffer.  (Note: the actual read of
     * input data into the input buffer happens down inside pqSendSome, but
     * it's not authorized to get rid of the data again.)
     */
    parseInput(conn);
 
    if (nbytes > 0)
    {
        /*
         * Try to flush any previously sent data in preference to growing the
         * output buffer.  If we can't enlarge the buffer enough to hold the
         * data, return 0 in the nonblock case, else hard error. (For
         * simplicity, always assume 5 bytes of overhead.)
         */
        if ((conn->outBufSize - conn->outCount - 5) < nbytes)
        {
            if (pqFlush(conn) < 0)
                return -1;
            if (pqCheckOutBufferSpace(conn->outCount + 5 + (size_t) nbytes,
                                      conn))
                return pqIsnonblocking(conn) ? 0 : -1;
        }
        /* Send the data (too simple to delegate to fe-protocol files) */
        if (pqPutMsgStart(PqMsg_CopyData, conn) < 0 ||
            pqPutnchar(buffer, nbytes, conn) < 0 ||
            pqPutMsgEnd(conn) < 0)
            return -1;
    }
    return 1;
}

References pg_conn::asyncStatus, conn, libpq_append_conn_error(), pg_conn::outBufSize, pg_conn::outCount, parseInput(), PGASYNC_COPY_BOTH, PGASYNC_COPY_IN, pqCheckOutBufferSpace(), pqFlush(), pqIsnonblocking, PqMsg_CopyData, pqPutMsgEnd(), pqPutMsgStart(), and pqPutnchar().

Referenced by BaseBackup(), ExecuteSqlCommandBuf(), handleCopyIn(), libpqrcv_send(), PQputnbytes(), and sendFeedback().

PQputCopyEnd()

int PQputCopyEnd	(	PGconn *	conn,
		const char *	errormsg
	)

Definition at line 2766 of file fe-exec.c.

{
    if (!conn)
        return -1;
    if (conn->asyncStatus != PGASYNC_COPY_IN &&
        conn->asyncStatus != PGASYNC_COPY_BOTH)
    {
        libpq_append_conn_error(conn, "no COPY in progress");
        return -1;
    }
 
    /*
     * Send the COPY END indicator.  This is simple enough that we don't
     * bother delegating it to the fe-protocol files.
     */
    if (errormsg)
    {
        /* Send COPY FAIL */
        if (pqPutMsgStart(PqMsg_CopyFail, conn) < 0 ||
            pqPuts(errormsg, conn) < 0 ||
            pqPutMsgEnd(conn) < 0)
            return -1;
    }
    else
    {
        /* Send COPY DONE */
        if (pqPutMsgStart(PqMsg_CopyDone, conn) < 0 ||
            pqPutMsgEnd(conn) < 0)
            return -1;
    }
 
    /*
     * If we sent the COPY command in extended-query mode, we must issue a
     * Sync as well.
     */
    if (conn->cmd_queue_head &&
        conn->cmd_queue_head->queryclass != PGQUERY_SIMPLE)
    {
        if (pqPutMsgStart(PqMsg_Sync, conn) < 0 ||
            pqPutMsgEnd(conn) < 0)
            return -1;
    }
 
    /* Return to active duty */
    if (conn->asyncStatus == PGASYNC_COPY_BOTH)
        conn->asyncStatus = PGASYNC_COPY_OUT;
    else
        conn->asyncStatus = PGASYNC_BUSY;
 
    /* Try to flush data */
    if (pqFlush(conn) < 0)
        return -1;
 
    return 1;
}

References pg_conn::asyncStatus, pg_conn::cmd_queue_head, conn, libpq_append_conn_error(), PGASYNC_BUSY, PGASYNC_COPY_BOTH, PGASYNC_COPY_IN, PGASYNC_COPY_OUT, PGQUERY_SIMPLE, pqFlush(), PqMsg_CopyDone, PqMsg_CopyFail, PqMsg_Sync, pqPutMsgEnd(), pqPutMsgStart(), pqPuts(), and PGcmdQueueEntry::queryclass.

Referenced by BaseBackup(), CheckCopyStreamStop(), EndDBCopyMode(), handleCopyIn(), HandleEndOfCopyStream(), libpqrcv_endstreaming(), PQexecStart(), prepareToTerminate(), and ProcessWALDataMsg().

PQputline()

int PQputline	(	PGconn *	conn,
		const char *	string
	)

Definition at line 2935 of file fe-exec.c.

{
    return PQputnbytes(conn, string, strlen(string));
}

References conn, and PQputnbytes().

Referenced by initPopulateTable().

PQputnbytes()

int PQputnbytes	(	PGconn *	conn,
		const char *	buffer,
		int	nbytes
	)

Definition at line 2945 of file fe-exec.c.

{
    if (PQputCopyData(conn, buffer, nbytes) > 0)
        return 0;
    else
        return EOF;
}

References conn, and PQputCopyData().

Referenced by PQputline().

pqRecycleCmdQueueEntry()

static void pqRecycleCmdQueueEntry ( PGconn *  conn, PGcmdQueueEntry *  entry  )

static

Definition at line 1403 of file fe-exec.c.

{
    if (entry == NULL)
        return;
 
    /* recyclable entries should not have a follow-on command */
    Assert(entry->next == NULL);
 
    if (entry->query)
    {
        free(entry->query);
        entry->query = NULL;
    }
 
    entry->next = conn->cmd_queue_recycle;
    conn->cmd_queue_recycle = entry;
}

References Assert(), pg_conn::cmd_queue_recycle, conn, free, PGcmdQueueEntry::next, and PGcmdQueueEntry::query.

Referenced by pqCommandQueueAdvance(), pqPipelineSyncInternal(), PQsendPrepare(), PQsendQueryGuts(), PQsendQueryInternal(), and PQsendTypedCommand().

PQresStatus()

char * PQresStatus

(

ExecStatusType

status

)

Definition at line 3436 of file fe-exec.c.

{
    if ((unsigned int) status >= lengthof(pgresStatus))
        return libpq_gettext("invalid ExecStatusType code");
    return pgresStatus[status];
}

References lengthof, libpq_gettext, and pgresStatus.

Referenced by BaseBackup(), confirm_result_status_impl(), consume_null_result_impl(), process_result(), test_pipeline_abort(), test_pipelined_insert(), test_prepared(), test_singlerowmode(), test_transaction(), and try_complete_step().

PQresultAlloc()

void * PQresultAlloc	(	PGresult *	res,
		size_t	nBytes
	)

Definition at line 544 of file fe-exec.c.

{
    /* Fail if argument is NULL or OOM_result */
    if (!res || (const PGresult *) res == &OOM_result)
        return NULL;
 
    return pqResultAlloc(res, nBytes, true);
}

References OOM_result, and pqResultAlloc().

Referenced by PQsetResultAttrs().

pqResultAlloc()

void * pqResultAlloc	(	PGresult *	res,
		size_t	nBytes,
		bool	isBinary
	)

Definition at line 564 of file fe-exec.c.

{
    char       *space;
    PGresult_data *block;
 
    if (!res)
        return NULL;
 
    if (nBytes <= 0)
        return res->null_field;
 
    /*
     * If alignment is needed, round up the current position to an alignment
     * boundary.
     */
    if (isBinary)
    {
        int         offset = res->curOffset % PGRESULT_ALIGN_BOUNDARY;
 
        if (offset)
        {
            res->curOffset += PGRESULT_ALIGN_BOUNDARY - offset;
            res->spaceLeft -= PGRESULT_ALIGN_BOUNDARY - offset;
        }
    }
 
    /* If there's enough space in the current block, no problem. */
    if (nBytes <= (size_t) res->spaceLeft)
    {
        space = res->curBlock->space + res->curOffset;
        res->curOffset += nBytes;
        res->spaceLeft -= nBytes;
        return space;
    }
 
    /*
     * If the requested object is very large, give it its own block; this
     * avoids wasting what might be most of the current block to start a new
     * block.  (We'd have to special-case requests bigger than the block size
     * anyway.)  The object is always given binary alignment in this case.
     */
    if (nBytes >= PGRESULT_SEP_ALLOC_THRESHOLD)
    {
        size_t      alloc_size;
 
        /* Don't wrap around with overly large requests. */
        if (nBytes > SIZE_MAX - PGRESULT_BLOCK_OVERHEAD)
            return NULL;
 
        alloc_size = nBytes + PGRESULT_BLOCK_OVERHEAD;
        block = (PGresult_data *) malloc(alloc_size);
        if (!block)
            return NULL;
        res->memorySize += alloc_size;
        space = block->space + PGRESULT_BLOCK_OVERHEAD;
        if (res->curBlock)
        {
            /*
             * Tuck special block below the active block, so that we don't
             * have to waste the free space in the active block.
             */
            block->next = res->curBlock->next;
            res->curBlock->next = block;
        }
        else
        {
            /* Must set up the new block as the first active block. */
            block->next = NULL;
            res->curBlock = block;
            res->spaceLeft = 0; /* be sure it's marked full */
        }
        return space;
    }
 
    /* Otherwise, start a new block. */
    block = (PGresult_data *) malloc(PGRESULT_DATA_BLOCKSIZE);
    if (!block)
        return NULL;
    res->memorySize += PGRESULT_DATA_BLOCKSIZE;
    block->next = res->curBlock;
    res->curBlock = block;
    if (isBinary)
    {
        /* object needs full alignment */
        res->curOffset = PGRESULT_BLOCK_OVERHEAD;
        res->spaceLeft = PGRESULT_DATA_BLOCKSIZE - PGRESULT_BLOCK_OVERHEAD;
    }
    else
    {
        /* we can cram it right after the overhead pointer */
        res->curOffset = sizeof(PGresult_data);
        res->spaceLeft = PGRESULT_DATA_BLOCKSIZE - sizeof(PGresult_data);
    }
 
    space = block->space + res->curOffset;
    res->curOffset += nBytes;
    res->spaceLeft -= nBytes;
    return space;
}

References pg_result::curBlock, pg_result::curOffset, malloc, pg_result::memorySize, pgresult_data::next, pg_result::null_field, PGRESULT_ALIGN_BOUNDARY, PGRESULT_BLOCK_OVERHEAD, PGRESULT_DATA_BLOCKSIZE, PGRESULT_SEP_ALLOC_THRESHOLD, pgresult_data::space, and pg_result::spaceLeft.

Referenced by getCopyStart(), getParamDescriptions(), getRowDescriptions(), pqInternalNotice(), PQresultAlloc(), pqResultStrdup(), pqRowProcessor(), pqSaveMessageField(), and PQsetvalue().

PQresultErrorField()

char * PQresultErrorField	(	const PGresult *	res,
		int	fieldcode
	)

Definition at line 3483 of file fe-exec.c.

{
    PGMessageField *pfield;
 
    if (!res)
        return NULL;
    for (pfield = res->errFields; pfield != NULL; pfield = pfield->next)
    {
        if (pfield->code == fieldcode)
            return pfield->contents;
    }
    return NULL;
}

References pgMessageField::code, pgMessageField::contents, pg_result::errFields, and pgMessageField::next.

PQresultErrorMessage()

char * PQresultErrorMessage

(

const PGresult *

res

)

Definition at line 3444 of file fe-exec.c.

{
    if (!res || !res->errMsg)
        return "";
    return res->errMsg;
}

References pg_result::errMsg.

PQresultMemorySize()

size_t PQresultMemorySize

(

const PGresult *

res

)

Definition at line 669 of file fe-exec.c.

{
    if (!res)
        return 0;
    return res->memorySize;
}

References pg_result::memorySize.

PQresultStatus()

ExecStatusType PQresultStatus

(

const PGresult *

res

)

Definition at line 3428 of file fe-exec.c.

{
    if (!res)
        return PGRES_FATAL_ERROR;
    return res->resultStatus;
}

References PGRES_FATAL_ERROR, and pg_result::resultStatus.

pqResultStrdup()

char * pqResultStrdup	(	PGresult *	res,
		const char *	str
	)

Definition at line 681 of file fe-exec.c.

{
    char       *space = (char *) pqResultAlloc(res, strlen(str) + 1, false);
 
    if (space)
        strcpy(space, str);
    return space;
}

References pqResultAlloc(), and str.

Referenced by getRowDescriptions(), pqGetErrorNotice3(), PQsetResultAttrs(), and pqSetResultError().

PQresultVerboseErrorMessage()

char * PQresultVerboseErrorMessage	(	const PGresult *	res,
		PGVerbosity	verbosity,
		PGContextVisibility	show_context
	)

Definition at line 3452 of file fe-exec.c.

{
    PQExpBufferData workBuf;
 
    /*
     * Because the caller is expected to free the result string, we must
     * strdup any constant result.  We use plain strdup and document that
     * callers should expect NULL if out-of-memory.
     */
    if (!res ||
        (res->resultStatus != PGRES_FATAL_ERROR &&
         res->resultStatus != PGRES_NONFATAL_ERROR))
        return strdup(libpq_gettext("PGresult is not an error result\n"));
 
    initPQExpBuffer(&workBuf);
 
    pqBuildErrorMessage3(&workBuf, res, verbosity, show_context);
 
    /* If insufficient memory to format the message, fail cleanly */
    if (PQExpBufferDataBroken(workBuf))
    {
        termPQExpBuffer(&workBuf);
        return strdup(libpq_gettext("out of memory\n"));
    }
 
    return workBuf.data;
}

References PQExpBufferData::data, initPQExpBuffer(), libpq_gettext, PGRES_FATAL_ERROR, PGRES_NONFATAL_ERROR, pqBuildErrorMessage3(), PQExpBufferDataBroken, pg_result::resultStatus, and termPQExpBuffer().

Referenced by exec_command_errverbose().

pqRowProcessor()

int pqRowProcessor	(	PGconn *	conn,
		const char **	errmsgp
	)

Definition at line 1223 of file fe-exec.c.

{
    PGresult   *res = conn->result;
    int         nfields = res->numAttributes;
    const PGdataValue *columns = conn->rowBuf;
    PGresAttValue *tup;
    int         i;
 
    /*
     * In partial-result mode, if we don't already have a partial PGresult
     * then make one by cloning conn->result (which should hold the correct
     * result metadata by now).  Then the original conn->result is moved over
     * to saved_result so that we can re-use it as a reference for future
     * partial results.  The saved result will become active again after
     * pqPrepareAsyncResult() returns the partial result to the application.
     */
    if (conn->partialResMode && conn->saved_result == NULL)
    {
        /* Copy everything that should be in the result at this point */
        res = PQcopyResult(res,
                           PG_COPYRES_ATTRS | PG_COPYRES_EVENTS |
                           PG_COPYRES_NOTICEHOOKS);
        if (!res)
            return 0;
        /* Change result status to appropriate special value */
        res->resultStatus = (conn->singleRowMode ? PGRES_SINGLE_TUPLE : PGRES_TUPLES_CHUNK);
        /* And stash it as the active result */
        conn->saved_result = conn->result;
        conn->result = res;
    }
 
    /*
     * Basically we just allocate space in the PGresult for each field and
     * copy the data over.
     *
     * Note: on malloc failure, we return 0 leaving *errmsgp still NULL, which
     * caller will take to mean "out of memory".  This is preferable to trying
     * to set up such a message here, because evidently there's not enough
     * memory for gettext() to do anything.
     */
    tup = (PGresAttValue *)
        pqResultAlloc(res, nfields * sizeof(PGresAttValue), true);
    if (tup == NULL)
        return 0;
 
    for (i = 0; i < nfields; i++)
    {
        int         clen = columns[i].len;
 
        if (clen < 0)
        {
            /* null field */
            tup[i].len = NULL_LEN;
            tup[i].value = res->null_field;
        }
        else
        {
            bool        isbinary = (res->attDescs[i].format != 0);
            char       *val;
 
            val = (char *) pqResultAlloc(res, (size_t) clen + 1, isbinary);
            if (val == NULL)
                return 0;
 
            /* copy and zero-terminate the data (even if it's binary) */
            memcpy(val, columns[i].value, clen);
            val[clen] = '\0';
 
            tup[i].len = clen;
            tup[i].value = val;
        }
    }
 
    /* And add the tuple to the PGresult's tuple array */
    if (!pqAddTuple(res, tup, errmsgp))
        return 0;
 
    /*
     * Success.  In partial-result mode, if we have enough rows then make the
     * result available to the client immediately.
     */
    if (conn->partialResMode && res->ntups >= conn->maxChunkSize)
        conn->asyncStatus = PGASYNC_READY_MORE;
 
    return 1;
}

References pg_conn::asyncStatus, pg_result::attDescs, conn, pgresAttDesc::format, i, pgresAttValue::len, pgDataValue::len, pg_conn::maxChunkSize, pg_result::ntups, pg_result::null_field, NULL_LEN, pg_result::numAttributes, pg_conn::partialResMode, PG_COPYRES_ATTRS, PG_COPYRES_EVENTS, PG_COPYRES_NOTICEHOOKS, PGASYNC_READY_MORE, PGRES_SINGLE_TUPLE, PGRES_TUPLES_CHUNK, pqAddTuple(), PQcopyResult(), pqResultAlloc(), pg_conn::result, pg_result::resultStatus, pg_conn::rowBuf, pg_conn::saved_result, pg_conn::singleRowMode, val, value, and pgresAttValue::value.

Referenced by getAnotherTuple().

pqSaveErrorResult()

void pqSaveErrorResult

(

PGconn *

conn

)

Definition at line 809 of file fe-exec.c.

{
    /* Drop any pending result ... */
    pqClearAsyncResult(conn);
    /* ... and set flag to remember to make an error result later */
    conn->error_result = true;
}

References conn, pg_conn::error_result, and pqClearAsyncResult().

Referenced by getAnotherTuple(), getCopyResult(), getParamDescriptions(), getRowDescriptions(), handleFatalError(), pqFunctionCall3(), pqGetNegotiateProtocolVersion3(), PQgetResult(), pqParseInput3(), pqPipelineProcessQueue(), and pqSaveWriteError().

pqSaveMessageField()

void pqSaveMessageField	(	PGresult *	res,
		char	code,
		const char *	value
	)

Definition at line 1066 of file fe-exec.c.

{
    PGMessageField *pfield;
 
    pfield = (PGMessageField *)
        pqResultAlloc(res,
                      offsetof(PGMessageField, contents) +
                      strlen(value) + 1,
                      true);
    if (!pfield)
        return;                 /* out of memory? */
    pfield->code = code;
    strcpy(pfield->contents, value);
    pfield->next = res->errFields;
    res->errFields = pfield;
}

References pgMessageField::code, pgMessageField::contents, pg_result::errFields, pgMessageField::next, pqResultAlloc(), and value.

Referenced by pqGetErrorNotice3(), and pqInternalNotice().

pqSaveParameterStatus()

int pqSaveParameterStatus	(	PGconn *	conn,
		const char *	name,
		const char *	value
	)

Definition at line 1091 of file fe-exec.c.

{
    pgParameterStatus *pstatus;
    pgParameterStatus *prev;
 
    /*
     * Forget any old information about the parameter
     */
    for (pstatus = conn->pstatus, prev = NULL;
         pstatus != NULL;
         prev = pstatus, pstatus = pstatus->next)
    {
        if (strcmp(pstatus->name, name) == 0)
        {
            if (prev)
                prev->next = pstatus->next;
            else
                conn->pstatus = pstatus->next;
            free(pstatus);      /* frees name and value strings too */
            break;
        }
    }
 
    /*
     * Store new info as a single malloc block
     */
    pstatus = (pgParameterStatus *) malloc(sizeof(pgParameterStatus) +
                                           strlen(name) + strlen(value) + 2);
    if (pstatus)
    {
        char       *ptr;
 
        ptr = ((char *) pstatus) + sizeof(pgParameterStatus);
        pstatus->name = ptr;
        strcpy(ptr, name);
        ptr += strlen(name) + 1;
        pstatus->value = ptr;
        strcpy(ptr, value);
        pstatus->next = conn->pstatus;
        conn->pstatus = pstatus;
    }
    else
    {
        /* out of memory */
        return 0;
    }
 
    /*
     * Save values of settings that are of interest to libpq in fields of the
     * PGconn object.  We keep client_encoding and standard_conforming_strings
     * in static variables as well, so that PQescapeString and PQescapeBytea
     * can behave somewhat sanely (at least in single-connection-using
     * programs).
     */
    if (strcmp(name, "client_encoding") == 0)
    {
        conn->client_encoding = pg_char_to_encoding(value);
        /* if we don't recognize the encoding name, fall back to SQL_ASCII */
        if (conn->client_encoding < 0)
            conn->client_encoding = PG_SQL_ASCII;
        static_client_encoding = conn->client_encoding;
    }
    else if (strcmp(name, "standard_conforming_strings") == 0)
    {
        conn->std_strings = (strcmp(value, "on") == 0);
        static_std_strings = conn->std_strings;
    }
    else if (strcmp(name, "server_version") == 0)
    {
        /* We convert the server version to numeric form. */
        int         cnt;
        int         vmaj,
                    vmin,
                    vrev;
 
        cnt = sscanf(value, "%d.%d.%d", &vmaj, &vmin, &vrev);
 
        if (cnt == 3)
        {
            /* old style, e.g. 9.6.1 */
            conn->sversion = (100 * vmaj + vmin) * 100 + vrev;
        }
        else if (cnt == 2)
        {
            if (vmaj >= 10)
            {
                /* new style, e.g. 10.1 */
                conn->sversion = 100 * 100 * vmaj + vmin;
            }
            else
            {
                /* old style without minor version, e.g. 9.6devel */
                conn->sversion = (100 * vmaj + vmin) * 100;
            }
        }
        else if (cnt == 1)
        {
            /* new style without minor version, e.g. 10devel */
            conn->sversion = 100 * 100 * vmaj;
        }
        else
            conn->sversion = 0; /* unknown */
    }
    else if (strcmp(name, "default_transaction_read_only") == 0)
    {
        conn->default_transaction_read_only =
            (strcmp(value, "on") == 0) ? PG_BOOL_YES : PG_BOOL_NO;
    }
    else if (strcmp(name, "in_hot_standby") == 0)
    {
        conn->in_hot_standby =
            (strcmp(value, "on") == 0) ? PG_BOOL_YES : PG_BOOL_NO;
    }
    else if (strcmp(name, "scram_iterations") == 0)
    {
        conn->scram_sha_256_iterations = atoi(value);
    }
 
    return 1;
}

References pg_conn::client_encoding, conn, pg_conn::default_transaction_read_only, free, pg_conn::in_hot_standby, malloc, name, pgParameterStatus::name, pgParameterStatus::next, PG_BOOL_NO, PG_BOOL_YES, pg_char_to_encoding, PG_SQL_ASCII, pg_conn::pstatus, pg_conn::scram_sha_256_iterations, static_client_encoding, static_std_strings, pg_conn::std_strings, pg_conn::sversion, value, and pgParameterStatus::value.

Referenced by getParameterStatus().

pqSaveWriteError()

static void pqSaveWriteError ( PGconn *  conn )

static

Definition at line 826 of file fe-exec.c.

{
    /*
     * If write_err_msg is null because of previous strdup failure, do what we
     * can.  (It's likely our machinations here will get OOM failures as well,
     * but might as well try.)
     */
    if (conn->write_err_msg)
    {
        appendPQExpBufferStr(&conn->errorMessage, conn->write_err_msg);
        /* Avoid possibly appending the same message twice */
        conn->write_err_msg[0] = '\0';
    }
    else
        libpq_append_conn_error(conn, "write to server failed");
 
    pqSaveErrorResult(conn);
}

References appendPQExpBufferStr(), conn, pg_conn::errorMessage, libpq_append_conn_error(), pqSaveErrorResult(), and pg_conn::write_err_msg.

Referenced by PQgetResult().

PQsendClosePortal()

int PQsendClosePortal	(	PGconn *	conn,
		const char *	portal
	)

Definition at line 2586 of file fe-exec.c.

{
    return PQsendTypedCommand(conn, PqMsg_Close, 'P', portal);
}

References conn, PqMsg_Close, and PQsendTypedCommand().

Referenced by test_prepared().

PQsendClosePrepared()

int PQsendClosePrepared	(	PGconn *	conn,
		const char *	stmt
	)

Definition at line 2573 of file fe-exec.c.

{
    return PQsendTypedCommand(conn, PqMsg_Close, 'S', stmt);
}

References conn, PqMsg_Close, PQsendTypedCommand(), and stmt.

Referenced by ExecQueryAndProcessResults(), and test_prepared().

PQsendDescribePortal()

int PQsendDescribePortal	(	PGconn *	conn,
		const char *	portal
	)

Definition at line 2521 of file fe-exec.c.

{
    return PQsendTypedCommand(conn, PqMsg_Describe, 'P', portal);
}

References conn, PqMsg_Describe, and PQsendTypedCommand().

Referenced by test_prepared().

PQsendDescribePrepared()

int PQsendDescribePrepared	(	PGconn *	conn,
		const char *	stmt
	)

Definition at line 2508 of file fe-exec.c.

{
    return PQsendTypedCommand(conn, PqMsg_Describe, 'S', stmt);
}

References conn, PqMsg_Describe, PQsendTypedCommand(), and stmt.

Referenced by test_prepared().

PQsendFlushRequest()

int PQsendFlushRequest

(

PGconn *

conn

)

Definition at line 3388 of file fe-exec.c.

{
    if (!conn)
        return 0;
 
    /* Don't try to send if we know there's no live connection. */
    if (conn->status != CONNECTION_OK)
    {
        libpq_append_conn_error(conn, "no connection to the server");
        return 0;
    }
 
    /* Can't send while already busy, either, unless enqueuing for later */
    if (conn->asyncStatus != PGASYNC_IDLE &&
        conn->pipelineStatus == PQ_PIPELINE_OFF)
    {
        libpq_append_conn_error(conn, "another command is already in progress");
        return 0;
    }
 
    if (pqPutMsgStart(PqMsg_Flush, conn) < 0 ||
        pqPutMsgEnd(conn) < 0)
    {
        return 0;
    }
 
    /*
     * Give the data a push (in pipeline mode, only if we're past the size
     * threshold).  In nonblock mode, don't complain if we're unable to send
     * it all; PQgetResult() will do any additional flushing needed.
     */
    if (pqPipelineFlush(conn) < 0)
        return 0;
 
    return 1;
}

References pg_conn::asyncStatus, conn, CONNECTION_OK, libpq_append_conn_error(), PGASYNC_IDLE, pg_conn::pipelineStatus, PQ_PIPELINE_OFF, PqMsg_Flush, pqPipelineFlush(), pqPutMsgEnd(), pqPutMsgStart(), and pg_conn::status.

Referenced by ExecQueryAndProcessResults(), test_nosync(), test_pipeline_idle(), test_singlerowmode(), and test_uniqviol().

PQsendPipelineSync()

int PQsendPipelineSync

(

PGconn *

conn

)

Definition at line 3299 of file fe-exec.c.

{
    return pqPipelineSyncInternal(conn, false);
}

References conn, and pqPipelineSyncInternal().

Referenced by ExecQueryAndProcessResults(), executeMetaCommand(), and test_multi_pipelines().

PQsendPrepare()

int PQsendPrepare	(	PGconn *	conn,
		const char *	stmtName,
		const char *	query,
		int	nParams,
		const Oid *	paramTypes
	)

Definition at line 1553 of file fe-exec.c.

{
    PGcmdQueueEntry *entry = NULL;
 
    if (!PQsendQueryStart(conn, true))
        return 0;
 
    /* check the arguments */
    if (!stmtName)
    {
        libpq_append_conn_error(conn, "statement name is a null pointer");
        return 0;
    }
    if (!query)
    {
        libpq_append_conn_error(conn, "command string is a null pointer");
        return 0;
    }
    if (nParams < 0 || nParams > PQ_QUERY_PARAM_MAX_LIMIT)
    {
        libpq_append_conn_error(conn, "number of parameters must be between 0 and %d",
                                PQ_QUERY_PARAM_MAX_LIMIT);
        return 0;
    }
 
    entry = pqAllocCmdQueueEntry(conn);
    if (entry == NULL)
        return 0;               /* error msg already set */
 
    /* construct the Parse message */
    if (pqPutMsgStart(PqMsg_Parse, conn) < 0 ||
        pqPuts(stmtName, conn) < 0 ||
        pqPuts(query, conn) < 0)
        goto sendFailed;
 
    if (nParams > 0 && paramTypes)
    {
        int         i;
 
        if (pqPutInt(nParams, 2, conn) < 0)
            goto sendFailed;
        for (i = 0; i < nParams; i++)
        {
            if (pqPutInt(paramTypes[i], 4, conn) < 0)
                goto sendFailed;
        }
    }
    else
    {
        if (pqPutInt(0, 2, conn) < 0)
            goto sendFailed;
    }
    if (pqPutMsgEnd(conn) < 0)
        goto sendFailed;
 
    /* Add a Sync, unless in pipeline mode. */
    if (conn->pipelineStatus == PQ_PIPELINE_OFF)
    {
        if (pqPutMsgStart(PqMsg_Sync, conn) < 0 ||
            pqPutMsgEnd(conn) < 0)
            goto sendFailed;
    }
 
    /* remember we are doing just a Parse */
    entry->queryclass = PGQUERY_PREPARE;
 
    /* and remember the query text too, if possible */
    /* if insufficient memory, query just winds up NULL */
    entry->query = strdup(query);
 
    /*
     * Give the data a push (in pipeline mode, only if we're past the size
     * threshold).  In nonblock mode, don't complain if we're unable to send
     * it all; PQgetResult() will do any additional flushing needed.
     */
    if (pqPipelineFlush(conn) < 0)
        goto sendFailed;
 
    /* OK, it's launched! */
    pqAppendCmdQueueEntry(conn, entry);
 
    return 1;
 
sendFailed:
    pqRecycleCmdQueueEntry(conn, entry);
    /* error message should be set up already */
    return 0;
}

References conn, i, libpq_append_conn_error(), PGQUERY_PREPARE, pg_conn::pipelineStatus, PQ_PIPELINE_OFF, PQ_QUERY_PARAM_MAX_LIMIT, pqAllocCmdQueueEntry(), pqAppendCmdQueueEntry(), PqMsg_Parse, PqMsg_Sync, pqPipelineFlush(), pqPutInt(), pqPutMsgEnd(), pqPutMsgStart(), pqPuts(), pqRecycleCmdQueueEntry(), PQsendQueryStart(), PGcmdQueueEntry::query, and PGcmdQueueEntry::queryclass.

Referenced by ExecQueryAndProcessResults(), PQprepare(), prepare_foreign_modify(), test_pipelined_insert(), test_prepared(), and test_transaction().

PQsendQuery()

int PQsendQuery	(	PGconn *	conn,
		const char *	query
	)

Definition at line 1433 of file fe-exec.c.

{
    return PQsendQueryInternal(conn, query, true);
}

References conn, and PQsendQueryInternal().

Referenced by advanceConnectionState(), BaseBackup(), dblink_send_query(), do_sql_command_begin(), ExecQueryAndProcessResults(), fetch_more_data_begin(), libpqsrv_exec(), pgfdw_exec_cleanup_query_begin(), pgfdw_exec_query(), pgfdw_finish_pre_commit_cleanup(), PQexec(), process_slot(), run_command(), run_permutation(), run_reindex_command(), run_vacuum_command(), sendCommand(), storeQueryResult(), and test_disallowed_in_pipeline().

PQsendQueryContinue()

int PQsendQueryContinue	(	PGconn *	conn,
		const char *	query
	)

Definition at line 1439 of file fe-exec.c.

{
    return PQsendQueryInternal(conn, query, false);
}

References conn, and PQsendQueryInternal().

Referenced by PQconnectPoll().

PQsendQueryGuts()

static int PQsendQueryGuts ( PGconn *  conn, const char *  command, const char *  stmtName, int  nParams, const Oid *  paramTypes, const char *const *  paramValues, const int *  paramLengths, const int *  paramFormats, int  resultFormat  )

static

Definition at line 1774 of file fe-exec.c.

{
    int         i;
    PGcmdQueueEntry *entry;
 
    entry = pqAllocCmdQueueEntry(conn);
    if (entry == NULL)
        return 0;               /* error msg already set */
 
    /*
     * We will send Parse (if needed), Bind, Describe Portal, Execute, Sync
     * (if not in pipeline mode), using specified statement name and the
     * unnamed portal.
     */
 
    if (command)
    {
        /* construct the Parse message */
        if (pqPutMsgStart(PqMsg_Parse, conn) < 0 ||
            pqPuts(stmtName, conn) < 0 ||
            pqPuts(command, conn) < 0)
            goto sendFailed;
        if (nParams > 0 && paramTypes)
        {
            if (pqPutInt(nParams, 2, conn) < 0)
                goto sendFailed;
            for (i = 0; i < nParams; i++)
            {
                if (pqPutInt(paramTypes[i], 4, conn) < 0)
                    goto sendFailed;
            }
        }
        else
        {
            if (pqPutInt(0, 2, conn) < 0)
                goto sendFailed;
        }
        if (pqPutMsgEnd(conn) < 0)
            goto sendFailed;
    }
 
    /* Construct the Bind message */
    if (pqPutMsgStart(PqMsg_Bind, conn) < 0 ||
        pqPuts("", conn) < 0 ||
        pqPuts(stmtName, conn) < 0)
        goto sendFailed;
 
    /* Send parameter formats */
    if (nParams > 0 && paramFormats)
    {
        if (pqPutInt(nParams, 2, conn) < 0)
            goto sendFailed;
        for (i = 0; i < nParams; i++)
        {
            if (pqPutInt(paramFormats[i], 2, conn) < 0)
                goto sendFailed;
        }
    }
    else
    {
        if (pqPutInt(0, 2, conn) < 0)
            goto sendFailed;
    }
 
    if (pqPutInt(nParams, 2, conn) < 0)
        goto sendFailed;
 
    /* Send parameters */
    for (i = 0; i < nParams; i++)
    {
        if (paramValues && paramValues[i])
        {
            int         nbytes;
 
            if (paramFormats && paramFormats[i] != 0)
            {
                /* binary parameter */
                if (paramLengths)
                    nbytes = paramLengths[i];
                else
                {
                    libpq_append_conn_error(conn, "length must be given for binary parameter");
                    goto sendFailed;
                }
            }
            else
            {
                /* text parameter, do not use paramLengths */
                nbytes = strlen(paramValues[i]);
            }
            if (pqPutInt(nbytes, 4, conn) < 0 ||
                pqPutnchar(paramValues[i], nbytes, conn) < 0)
                goto sendFailed;
        }
        else
        {
            /* take the param as NULL */
            if (pqPutInt(-1, 4, conn) < 0)
                goto sendFailed;
        }
    }
    if (pqPutInt(1, 2, conn) < 0 ||
        pqPutInt(resultFormat, 2, conn))
        goto sendFailed;
    if (pqPutMsgEnd(conn) < 0)
        goto sendFailed;
 
    /* construct the Describe Portal message */
    if (pqPutMsgStart(PqMsg_Describe, conn) < 0 ||
        pqPutc('P', conn) < 0 ||
        pqPuts("", conn) < 0 ||
        pqPutMsgEnd(conn) < 0)
        goto sendFailed;
 
    /* construct the Execute message */
    if (pqPutMsgStart(PqMsg_Execute, conn) < 0 ||
        pqPuts("", conn) < 0 ||
        pqPutInt(0, 4, conn) < 0 ||
        pqPutMsgEnd(conn) < 0)
        goto sendFailed;
 
    /* construct the Sync message if not in pipeline mode */
    if (conn->pipelineStatus == PQ_PIPELINE_OFF)
    {
        if (pqPutMsgStart(PqMsg_Sync, conn) < 0 ||
            pqPutMsgEnd(conn) < 0)
            goto sendFailed;
    }
 
    /* remember we are using extended query protocol */
    entry->queryclass = PGQUERY_EXTENDED;
 
    /* and remember the query text too, if possible */
    /* if insufficient memory, query just winds up NULL */
    if (command)
        entry->query = strdup(command);
 
    /*
     * Give the data a push (in pipeline mode, only if we're past the size
     * threshold).  In nonblock mode, don't complain if we're unable to send
     * it all; PQgetResult() will do any additional flushing needed.
     */
    if (pqPipelineFlush(conn) < 0)
        goto sendFailed;
 
    /* OK, it's launched! */
    pqAppendCmdQueueEntry(conn, entry);
 
    return 1;
 
sendFailed:
    pqRecycleCmdQueueEntry(conn, entry);
    /* error message should be set up already */
    return 0;
}

References conn, i, libpq_append_conn_error(), PGQUERY_EXTENDED, pg_conn::pipelineStatus, PQ_PIPELINE_OFF, pqAllocCmdQueueEntry(), pqAppendCmdQueueEntry(), PqMsg_Bind, PqMsg_Describe, PqMsg_Execute, PqMsg_Parse, PqMsg_Sync, pqPipelineFlush(), pqPutc(), pqPutInt(), pqPutMsgEnd(), pqPutMsgStart(), pqPutnchar(), pqPuts(), pqRecycleCmdQueueEntry(), PGcmdQueueEntry::query, and PGcmdQueueEntry::queryclass.

Referenced by PQsendQueryParams(), and PQsendQueryPrepared().

PQsendQueryInternal()

static int PQsendQueryInternal ( PGconn *  conn, const char *  query, bool  newQuery  )

static

Definition at line 1445 of file fe-exec.c.

{
    PGcmdQueueEntry *entry = NULL;
 
    if (!PQsendQueryStart(conn, newQuery))
        return 0;
 
    /* check the argument */
    if (!query)
    {
        libpq_append_conn_error(conn, "command string is a null pointer");
        return 0;
    }
 
    if (conn->pipelineStatus != PQ_PIPELINE_OFF)
    {
        libpq_append_conn_error(conn, "%s not allowed in pipeline mode",
                                "PQsendQuery");
        return 0;
    }
 
    entry = pqAllocCmdQueueEntry(conn);
    if (entry == NULL)
        return 0;               /* error msg already set */
 
    /* Send the query message(s) */
    /* construct the outgoing Query message */
    if (pqPutMsgStart(PqMsg_Query, conn) < 0 ||
        pqPuts(query, conn) < 0 ||
        pqPutMsgEnd(conn) < 0)
    {
        /* error message should be set up already */
        pqRecycleCmdQueueEntry(conn, entry);
        return 0;
    }
 
    /* remember we are using simple query protocol */
    entry->queryclass = PGQUERY_SIMPLE;
    /* and remember the query text too, if possible */
    entry->query = strdup(query);
 
    /*
     * Give the data a push.  In nonblock mode, don't complain if we're unable
     * to send it all; PQgetResult() will do any additional flushing needed.
     */
    if (pqFlush(conn) < 0)
        goto sendFailed;
 
    /* OK, it's launched! */
    pqAppendCmdQueueEntry(conn, entry);
 
    return 1;
 
sendFailed:
    pqRecycleCmdQueueEntry(conn, entry);
    /* error message should be set up already */
    return 0;
}

References conn, libpq_append_conn_error(), PGQUERY_SIMPLE, pg_conn::pipelineStatus, PQ_PIPELINE_OFF, pqAllocCmdQueueEntry(), pqAppendCmdQueueEntry(), pqFlush(), PqMsg_Query, pqPutMsgEnd(), pqPutMsgStart(), pqPuts(), pqRecycleCmdQueueEntry(), PQsendQueryStart(), PGcmdQueueEntry::query, and PGcmdQueueEntry::queryclass.

Referenced by PQsendQuery(), and PQsendQueryContinue().

PQsendQueryParams()

int PQsendQueryParams	(	PGconn *	conn,
		const char *	command,
		int	nParams,
		const Oid *	paramTypes,
		const char *const *	paramValues,
		const int *	paramLengths,
		const int *	paramFormats,
		int	resultFormat
	)

Definition at line 1509 of file fe-exec.c.

{
    if (!PQsendQueryStart(conn, true))
        return 0;
 
    /* check the arguments */
    if (!command)
    {
        libpq_append_conn_error(conn, "command string is a null pointer");
        return 0;
    }
    if (nParams < 0 || nParams > PQ_QUERY_PARAM_MAX_LIMIT)
    {
        libpq_append_conn_error(conn, "number of parameters must be between 0 and %d",
                                PQ_QUERY_PARAM_MAX_LIMIT);
        return 0;
    }
 
    return PQsendQueryGuts(conn,
                           command,
                           "",  /* use unnamed statement */
                           nParams,
                           paramTypes,
                           paramValues,
                           paramLengths,
                           paramFormats,
                           resultFormat);
}

References conn, libpq_append_conn_error(), PQ_QUERY_PARAM_MAX_LIMIT, PQsendQueryGuts(), and PQsendQueryStart().

Referenced by create_cursor(), ExecQueryAndProcessResults(), execute_dml_stmt(), libpqsrv_exec_params(), PQexecParams(), send_cancellable_query_impl(), sendCommand(), test_multi_pipelines(), test_nosync(), test_pipeline_abort(), test_pipeline_idle(), test_pipelined_insert(), test_simple_pipeline(), test_singlerowmode(), and test_transaction().

PQsendQueryPrepared()

int PQsendQueryPrepared	(	PGconn *	conn,
		const char *	stmtName,
		int	nParams,
		const char *const *	paramValues,
		const int *	paramLengths,
		const int *	paramFormats,
		int	resultFormat
	)

Definition at line 1650 of file fe-exec.c.

{
    if (!PQsendQueryStart(conn, true))
        return 0;
 
    /* check the arguments */
    if (!stmtName)
    {
        libpq_append_conn_error(conn, "statement name is a null pointer");
        return 0;
    }
    if (nParams < 0 || nParams > PQ_QUERY_PARAM_MAX_LIMIT)
    {
        libpq_append_conn_error(conn, "number of parameters must be between 0 and %d",
                                PQ_QUERY_PARAM_MAX_LIMIT);
        return 0;
    }
 
    return PQsendQueryGuts(conn,
                           NULL,    /* no command to parse */
                           stmtName,
                           nParams,
                           NULL,    /* no param types */
                           paramValues,
                           paramLengths,
                           paramFormats,
                           resultFormat);
}

References conn, libpq_append_conn_error(), PQ_QUERY_PARAM_MAX_LIMIT, PQsendQueryGuts(), and PQsendQueryStart().

Referenced by ExecQueryAndProcessResults(), execute_foreign_modify(), PQexecPrepared(), process_queued_fetch_requests(), sendCommand(), test_pipelined_insert(), test_transaction(), and test_uniqviol().

PQsendQueryStart()

static bool PQsendQueryStart ( PGconn *  conn, bool  newQuery  )

static

Definition at line 1690 of file fe-exec.c.

{
    if (!conn)
        return false;
 
    /*
     * If this is the beginning of a query cycle, reset the error state.
     * However, in pipeline mode with something already queued, the error
     * buffer belongs to that command and we shouldn't clear it.
     */
    if (newQuery && conn->cmd_queue_head == NULL)
        pqClearConnErrorState(conn);
 
    /* Don't try to send if we know there's no live connection. */
    if (conn->status != CONNECTION_OK)
    {
        libpq_append_conn_error(conn, "no connection to the server");
        return false;
    }
 
    /* Can't send while already busy, either, unless enqueuing for later */
    if (conn->asyncStatus != PGASYNC_IDLE &&
        conn->pipelineStatus == PQ_PIPELINE_OFF)
    {
        libpq_append_conn_error(conn, "another command is already in progress");
        return false;
    }
 
    if (conn->pipelineStatus != PQ_PIPELINE_OFF)
    {
        /*
         * When enqueuing commands we don't change much of the connection
         * state since it's already in use for the current command. The
         * connection state will get updated when pqPipelineProcessQueue()
         * advances to start processing the queued message.
         *
         * Just make sure we can safely enqueue given the current connection
         * state. We can enqueue behind another queue item, or behind a
         * non-queue command (one that sends its own sync), but we can't
         * enqueue if the connection is in a copy state.
         */
        switch (conn->asyncStatus)
        {
            case PGASYNC_IDLE:
            case PGASYNC_PIPELINE_IDLE:
            case PGASYNC_READY:
            case PGASYNC_READY_MORE:
            case PGASYNC_BUSY:
                /* ok to queue */
                break;
 
            case PGASYNC_COPY_IN:
            case PGASYNC_COPY_OUT:
            case PGASYNC_COPY_BOTH:
                libpq_append_conn_error(conn, "cannot queue commands during COPY");
                return false;
        }
    }
    else
    {
        /*
         * This command's results will come in immediately. Initialize async
         * result-accumulation state
         */
        pqClearAsyncResult(conn);
 
        /* reset partial-result mode */
        conn->partialResMode = false;
        conn->singleRowMode = false;
        conn->maxChunkSize = 0;
    }
 
    /* ready to send command message */
    return true;
}

References pg_conn::asyncStatus, pg_conn::cmd_queue_head, conn, CONNECTION_OK, libpq_append_conn_error(), pg_conn::maxChunkSize, pg_conn::partialResMode, PGASYNC_BUSY, PGASYNC_COPY_BOTH, PGASYNC_COPY_IN, PGASYNC_COPY_OUT, PGASYNC_IDLE, PGASYNC_PIPELINE_IDLE, PGASYNC_READY, PGASYNC_READY_MORE, pg_conn::pipelineStatus, PQ_PIPELINE_OFF, pqClearAsyncResult(), pqClearConnErrorState, pg_conn::singleRowMode, and pg_conn::status.

Referenced by PQsendPrepare(), PQsendQueryInternal(), PQsendQueryParams(), PQsendQueryPrepared(), and PQsendTypedCommand().

PQsendTypedCommand()

static int PQsendTypedCommand ( PGconn *  conn, char  command, char  type, const char *  target  )

static

Definition at line 2606 of file fe-exec.c.

{
    PGcmdQueueEntry *entry = NULL;
 
    /* Treat null target as empty string */
    if (!target)
        target = "";
 
    if (!PQsendQueryStart(conn, true))
        return 0;
 
    entry = pqAllocCmdQueueEntry(conn);
    if (entry == NULL)
        return 0;               /* error msg already set */
 
    /* construct the Close message */
    if (pqPutMsgStart(command, conn) < 0 ||
        pqPutc(type, conn) < 0 ||
        pqPuts(target, conn) < 0 ||
        pqPutMsgEnd(conn) < 0)
        goto sendFailed;
 
    /* construct the Sync message */
    if (conn->pipelineStatus == PQ_PIPELINE_OFF)
    {
        if (pqPutMsgStart(PqMsg_Sync, conn) < 0 ||
            pqPutMsgEnd(conn) < 0)
            goto sendFailed;
    }
 
    /* remember if we are doing a Close or a Describe */
    if (command == PqMsg_Close)
    {
        entry->queryclass = PGQUERY_CLOSE;
    }
    else if (command == PqMsg_Describe)
    {
        entry->queryclass = PGQUERY_DESCRIBE;
    }
    else
    {
        libpq_append_conn_error(conn, "unrecognized message type \"%c\"", command);
        goto sendFailed;
    }
 
    /*
     * Give the data a push (in pipeline mode, only if we're past the size
     * threshold).  In nonblock mode, don't complain if we're unable to send
     * it all; PQgetResult() will do any additional flushing needed.
     */
    if (pqPipelineFlush(conn) < 0)
        goto sendFailed;
 
    /* OK, it's launched! */
    pqAppendCmdQueueEntry(conn, entry);
 
    return 1;
 
sendFailed:
    pqRecycleCmdQueueEntry(conn, entry);
    /* error message should be set up already */
    return 0;
}

References conn, libpq_append_conn_error(), PGQUERY_CLOSE, PGQUERY_DESCRIBE, pg_conn::pipelineStatus, PQ_PIPELINE_OFF, pqAllocCmdQueueEntry(), pqAppendCmdQueueEntry(), PqMsg_Close, PqMsg_Describe, PqMsg_Sync, pqPipelineFlush(), pqPutc(), pqPutMsgEnd(), pqPutMsgStart(), pqPuts(), pqRecycleCmdQueueEntry(), PQsendQueryStart(), PGcmdQueueEntry::queryclass, and type.

Referenced by PQclosePortal(), PQclosePrepared(), PQdescribePortal(), PQdescribePrepared(), PQsendClosePortal(), PQsendClosePrepared(), PQsendDescribePortal(), and PQsendDescribePrepared().

PQsetChunkedRowsMode()

int PQsetChunkedRowsMode	(	PGconn *	conn,
		int	chunkSize
	)

Definition at line 1982 of file fe-exec.c.

{
    if (chunkSize > 0 && canChangeResultMode(conn))
    {
        conn->partialResMode = true;
        conn->singleRowMode = false;
        conn->maxChunkSize = chunkSize;
        return 1;
    }
    else
        return 0;
}

References canChangeResultMode(), conn, pg_conn::maxChunkSize, pg_conn::partialResMode, and pg_conn::singleRowMode.

Referenced by ExecQueryAndProcessResults(), and test_singlerowmode().

PQsetnonblocking()

int PQsetnonblocking	(	PGconn *	conn,
		int	arg
	)

Definition at line 3961 of file fe-exec.c.

{
    bool        barg;
 
    if (!conn || conn->status == CONNECTION_BAD)
        return -1;
 
    barg = (arg ? true : false);
 
    /* early out if the socket is already in the state requested */
    if (barg == conn->nonblocking)
        return 0;
 
    /*
     * to guarantee constancy for flushing/query/result-polling behavior we
     * need to flush the send queue at this point in order to guarantee proper
     * behavior. this is ok because either they are making a transition _from_
     * or _to_ blocking mode, either way we can block them.
     *
     * Clear error state in case pqFlush adds to it, unless we're actively
     * pipelining, in which case it seems best not to.
     */
    if (conn->cmd_queue_head == NULL)
        pqClearConnErrorState(conn);
 
    /* if we are going from blocking to non-blocking flush here */
    if (pqFlush(conn))
        return -1;
 
    conn->nonblocking = barg;
 
    return 0;
}

References arg, pg_conn::cmd_queue_head, conn, CONNECTION_BAD, pg_conn::nonblocking, pqClearConnErrorState, pqFlush(), pg_conn::status, and true.

Referenced by test_cancel(), test_pipelined_insert(), and test_uniqviol().

PQsetResultAttrs()

int PQsetResultAttrs	(	PGresult *	res,
		int	numAttributes,
		PGresAttDesc *	attDescs
	)

Definition at line 250 of file fe-exec.c.

{
    int         i;
 
    /* Fail if argument is NULL or OOM_result */
    if (!res || (const PGresult *) res == &OOM_result)
        return false;
 
    /* If attrs already exist, they cannot be overwritten. */
    if (res->numAttributes > 0)
        return false;
 
    /* ignore no-op request */
    if (numAttributes <= 0 || !attDescs)
        return true;
 
    res->attDescs = (PGresAttDesc *)
        PQresultAlloc(res, numAttributes * sizeof(PGresAttDesc));
 
    if (!res->attDescs)
        return false;
 
    res->numAttributes = numAttributes;
    memcpy(res->attDescs, attDescs, numAttributes * sizeof(PGresAttDesc));
 
    /* deep-copy the attribute names, and determine format */
    res->binary = 1;
    for (i = 0; i < res->numAttributes; i++)
    {
        if (res->attDescs[i].name)
            res->attDescs[i].name = pqResultStrdup(res, res->attDescs[i].name);
        else
            res->attDescs[i].name = res->null_field;
 
        if (!res->attDescs[i].name)
            return false;
 
        if (res->attDescs[i].format == 0)
            res->binary = 0;
    }
 
    return true;
}

References pg_result::attDescs, pg_result::binary, pgresAttDesc::format, i, pgresAttDesc::name, pg_result::null_field, pg_result::numAttributes, OOM_result, PQresultAlloc(), and pqResultStrdup().

Referenced by PQcopyResult().

pqSetResultError()

void pqSetResultError	(	PGresult *	res,
		PQExpBuffer	errorMessage,
		int	offset
	)

Definition at line 698 of file fe-exec.c.

{
    char       *msg;
 
    if (!res)
        return;
 
    /*
     * We handle two OOM scenarios here.  The errorMessage buffer might be
     * marked "broken" due to having previously failed to allocate enough
     * memory for the message, or it might be fine but pqResultStrdup fails
     * and returns NULL.  In either case, just make res->errMsg point directly
     * at a constant "out of memory" string.
     */
    if (!PQExpBufferBroken(errorMessage))
        msg = pqResultStrdup(res, errorMessage->data + offset);
    else
        msg = NULL;
    if (msg)
        res->errMsg = msg;
    else
        res->errMsg = libpq_gettext("out of memory\n");
}

References PQExpBufferData::data, pg_result::errMsg, libpq_gettext, PQExpBufferBroken, and pqResultStrdup().

Referenced by pqGetErrorNotice3(), PQmakeEmptyPGresult(), and pqPrepareAsyncResult().

PQsetSingleRowMode()

int PQsetSingleRowMode

(

PGconn *

conn

)

Definition at line 1965 of file fe-exec.c.

{
    if (canChangeResultMode(conn))
    {
        conn->partialResMode = true;
        conn->singleRowMode = true;
        conn->maxChunkSize = 1;
        return 1;
    }
    else
        return 0;
}

References canChangeResultMode(), conn, pg_conn::maxChunkSize, pg_conn::partialResMode, and pg_conn::singleRowMode.

Referenced by process_queued_fetch_requests(), storeQueryResult(), test_pipeline_abort(), and test_singlerowmode().

PQsetvalue()

int PQsetvalue	(	PGresult *	res,
		int	tup_num,
		int	field_num,
		char *	value,
		int	len
	)

Definition at line 453 of file fe-exec.c.

{
    PGresAttValue *attval;
    const char *errmsg = NULL;
 
    /* Fail if argument is NULL or OOM_result */
    if (!res || (const PGresult *) res == &OOM_result)
        return false;
 
    /* Invalid field_num? */
    if (!check_field_number(res, field_num))
        return false;
 
    /* Invalid tup_num, must be <= ntups */
    if (tup_num < 0 || tup_num > res->ntups)
    {
        pqInternalNotice(&res->noticeHooks,
                         "row number %d is out of range 0..%d",
                         tup_num, res->ntups);
        return false;
    }
 
    /* need to allocate a new tuple? */
    if (tup_num == res->ntups)
    {
        PGresAttValue *tup;
        int         i;
 
        tup = (PGresAttValue *)
            pqResultAlloc(res, res->numAttributes * sizeof(PGresAttValue),
                          true);
 
        if (!tup)
            goto fail;
 
        /* initialize each column to NULL */
        for (i = 0; i < res->numAttributes; i++)
        {
            tup[i].len = NULL_LEN;
            tup[i].value = res->null_field;
        }
 
        /* add it to the array */
        if (!pqAddTuple(res, tup, &errmsg))
            goto fail;
    }
 
    attval = &res->tuples[tup_num][field_num];
 
    /* treat either NULL_LEN or NULL value pointer as a NULL field */
    if (len == NULL_LEN || value == NULL)
    {
        attval->len = NULL_LEN;
        attval->value = res->null_field;
    }
    else if (len <= 0)
    {
        attval->len = 0;
        attval->value = res->null_field;
    }
    else
    {
        attval->value = (char *) pqResultAlloc(res, (size_t) len + 1, true);
        if (!attval->value)
            goto fail;
        attval->len = len;
        memcpy(attval->value, value, len);
        attval->value[len] = '\0';
    }
 
    return true;
 
    /*
     * Report failure via pqInternalNotice.  If preceding code didn't provide
     * an error message, assume "out of memory" was meant.
     */
fail:
    if (!errmsg)
        errmsg = libpq_gettext("out of memory");
    pqInternalNotice(&res->noticeHooks, "%s", errmsg);
 
    return false;
}

References check_field_number(), errmsg(), i, pgresAttValue::len, len, libpq_gettext, pg_result::noticeHooks, pg_result::ntups, pg_result::null_field, NULL_LEN, pg_result::numAttributes, OOM_result, pqAddTuple(), pqInternalNotice(), pqResultAlloc(), pg_result::tuples, value, and pgresAttValue::value.

Referenced by PQcopyResult().

PQunescapeBytea()

unsigned char * PQunescapeBytea	(	const unsigned char *	strtext,
		size_t *	retbuflen
	)

Definition at line 4617 of file fe-exec.c.

{
    size_t      strtextlen,
                buflen;
    unsigned char *buffer,
               *tmpbuf;
    size_t      i,
                j;
 
    if (strtext == NULL)
        return NULL;
 
    strtextlen = strlen((const char *) strtext);
 
    if (strtext[0] == '\\' && strtext[1] == 'x')
    {
        const unsigned char *s;
        unsigned char *p;
 
        buflen = (strtextlen - 2) / 2;
        /* Avoid unportable malloc(0) */
        buffer = (unsigned char *) malloc(buflen > 0 ? buflen : 1);
        if (buffer == NULL)
            return NULL;
 
        s = strtext + 2;
        p = buffer;
        while (*s)
        {
            char        v1,
                        v2;
 
            /*
             * Bad input is silently ignored.  Note that this includes
             * whitespace between hex pairs, which is allowed by byteain.
             */
            v1 = get_hex(*s++);
            if (!*s || v1 == (char) -1)
                continue;
            v2 = get_hex(*s++);
            if (v2 != (char) -1)
                *p++ = (v1 << 4) | v2;
        }
 
        buflen = p - buffer;
    }
    else
    {
        /*
         * Length of input is max length of output, but add one to avoid
         * unportable malloc(0) if input is zero-length.
         */
        buffer = (unsigned char *) malloc(strtextlen + 1);
        if (buffer == NULL)
            return NULL;
 
        for (i = j = 0; i < strtextlen;)
        {
            switch (strtext[i])
            {
                case '\\':
                    i++;
                    if (strtext[i] == '\\')
                        buffer[j++] = strtext[i++];
                    else
                    {
                        if ((ISFIRSTOCTDIGIT(strtext[i])) &&
                            (ISOCTDIGIT(strtext[i + 1])) &&
                            (ISOCTDIGIT(strtext[i + 2])))
                        {
                            int         byte;
 
                            byte = OCTVAL(strtext[i++]);
                            byte = (byte << 3) + OCTVAL(strtext[i++]);
                            byte = (byte << 3) + OCTVAL(strtext[i++]);
                            buffer[j++] = byte;
                        }
                    }
 
                    /*
                     * Note: if we see '\' followed by something that isn't a
                     * recognized escape sequence, we loop around having done
                     * nothing except advance i.  Therefore the something will
                     * be emitted as ordinary data on the next cycle. Corner
                     * case: '\' at end of string will just be discarded.
                     */
                    break;
 
                default:
                    buffer[j++] = strtext[i++];
                    break;
            }
        }
        buflen = j;             /* buflen is the length of the dequoted data */
    }
 
    /* Shrink the buffer to be no larger than necessary */
    /* +1 avoids unportable behavior when buflen==0 */
    tmpbuf = realloc(buffer, buflen + 1);
 
    /* It would only be a very brain-dead realloc that could fail, but... */
    if (!tmpbuf)
    {
        free(buffer);
        return NULL;
    }
 
    *retbuflen = buflen;
    return tmpbuf;
}

References free, get_hex(), i, ISFIRSTOCTDIGIT, ISOCTDIGIT, j, malloc, OCTVAL, realloc, and tmpbuf.

Variable Documentation

hexlookup

const int8 hexlookup[128]

static

Initial value:

= {
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1,
    -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
}

Definition at line 4413 of file fe-exec.c.

Referenced by get_hex().

hextbl

const char hextbl[] = "0123456789abcdef"

static

Definition at line 4411 of file fe-exec.c.

Referenced by PQescapeByteaInternal().

OOM_result

const PGresult OOM_result

static

Initial value:

= {
    .resultStatus = PGRES_FATAL_ERROR,
    .client_encoding = PG_SQL_ASCII,
    .errMsg = "out of memory\n",
}

Definition at line 50 of file fe-exec.c.

Referenced by PQclear(), pqPrepareAsyncResult(), PQresultAlloc(), PQsetResultAttrs(), and PQsetvalue().

pgresStatus

char* const pgresStatus[]

Initial value:

= {
    "PGRES_EMPTY_QUERY",
    "PGRES_COMMAND_OK",
    "PGRES_TUPLES_OK",
    "PGRES_COPY_OUT",
    "PGRES_COPY_IN",
    "PGRES_BAD_RESPONSE",
    "PGRES_NONFATAL_ERROR",
    "PGRES_FATAL_ERROR",
    "PGRES_COPY_BOTH",
    "PGRES_SINGLE_TUPLE",
    "PGRES_PIPELINE_SYNC",
    "PGRES_PIPELINE_ABORTED",
    "PGRES_TUPLES_CHUNK"
}

Definition at line 33 of file fe-exec.c.

Referenced by PQresStatus().

static_client_encoding

int static_client_encoding = PG_SQL_ASCII

static

Definition at line 60 of file fe-exec.c.

Referenced by PQescapeString(), and pqSaveParameterStatus().

static_std_strings

bool static_std_strings = false

static

Definition at line 61 of file fe-exec.c.

Referenced by PQescapeBytea(), PQescapeString(), and pqSaveParameterStatus().