oid.c

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/*-------------------------------------------------------------------------
 *
 * oid.c
 *    Functions for the built-in type Oid ... also oidvector.
 *
 * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 *
 * IDENTIFICATION
 *    src/backend/utils/adt/oid.c
 *
 *-------------------------------------------------------------------------
 */
#include "postgres.h"

#include <ctype.h>
#include <limits.h>

#include "catalog/pg_type.h"
#include "libpq/pqformat.h"
#include "nodes/value.h"
#include "utils/array.h"
#include "utils/builtins.h"


#define OidVectorSize(n)    (offsetof(oidvector, values) + (n) * sizeof(Oid))


/*****************************************************************************
 *   USER I/O ROUTINES                                                       *
 *****************************************************************************/

static Oid
oidin_subr(const char *s, char **endloc)
{
    unsigned long cvt;
    char       *endptr;
    Oid         result;

    if (*s == '\0')
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
                 errmsg("invalid input syntax for type %s: \"%s\"",
                        "oid", s)));

    errno = 0;
    cvt = strtoul(s, &endptr, 10);

    /*
     * strtoul() normally only sets ERANGE.  On some systems it also may set
     * EINVAL, which simply means it couldn't parse the input string. This is
     * handled by the second "if" consistent across platforms.
     */
    if (errno && errno != ERANGE && errno != EINVAL)
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
                 errmsg("invalid input syntax for type %s: \"%s\"",
                        "oid", s)));

    if (endptr == s && *s != '\0')
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
                 errmsg("invalid input syntax for type %s: \"%s\"",
                        "oid", s)));

    if (errno == ERANGE)
        ereport(ERROR,
                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                 errmsg("value \"%s\" is out of range for type %s",
                        s, "oid")));

    if (endloc)
    {
        /* caller wants to deal with rest of string */
        *endloc = endptr;
    }
    else
    {
        /* allow only whitespace after number */
        while (*endptr && isspace((unsigned char) *endptr))
            endptr++;
        if (*endptr)
            ereport(ERROR,
                    (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
                     errmsg("invalid input syntax for type %s: \"%s\"",
                            "oid", s)));
    }

    result = (Oid) cvt;

    /*
     * Cope with possibility that unsigned long is wider than Oid, in which
     * case strtoul will not raise an error for some values that are out of
     * the range of Oid.
     *
     * For backwards compatibility, we want to accept inputs that are given
     * with a minus sign, so allow the input value if it matches after either
     * signed or unsigned extension to long.
     *
     * To ensure consistent results on 32-bit and 64-bit platforms, make sure
     * the error message is the same as if strtoul() had returned ERANGE.
     */
#if OID_MAX != ULONG_MAX
    if (cvt != (unsigned long) result &&
        cvt != (unsigned long) ((int) result))
        ereport(ERROR,
                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                 errmsg("value \"%s\" is out of range for type %s",
                        s, "oid")));
#endif

    return result;
}

Datum
oidin(PG_FUNCTION_ARGS)
{
    char       *s = PG_GETARG_CSTRING(0);
    Oid         result;

    result = oidin_subr(s, NULL);
    PG_RETURN_OID(result);
}

Datum
oidout(PG_FUNCTION_ARGS)
{
    Oid         o = PG_GETARG_OID(0);
    char       *result = (char *) palloc(12);

    snprintf(result, 12, "%u", o);
    PG_RETURN_CSTRING(result);
}

/*
 *      oidrecv         - converts external binary format to oid
 */
Datum
oidrecv(PG_FUNCTION_ARGS)
{
    StringInfo  buf = (StringInfo) PG_GETARG_POINTER(0);

    PG_RETURN_OID((Oid) pq_getmsgint(buf, sizeof(Oid)));
}

/*
 *      oidsend         - converts oid to binary format
 */
Datum
oidsend(PG_FUNCTION_ARGS)
{
    Oid         arg1 = PG_GETARG_OID(0);
    StringInfoData buf;

    pq_begintypsend(&buf);
    pq_sendint32(&buf, arg1);
    PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
}

/*
 * construct oidvector given a raw array of Oids
 *
 * If oids is NULL then caller must fill values[] afterward
 */
oidvector *
buildoidvector(const Oid *oids, int n)
{
    oidvector  *result;

    result = (oidvector *) palloc0(OidVectorSize(n));

    if (n > 0 && oids)
        memcpy(result->values, oids, n * sizeof(Oid));

    /*
     * Attach standard array header.  For historical reasons, we set the index
     * lower bound to 0 not 1.
     */
    SET_VARSIZE(result, OidVectorSize(n));
    result->ndim = 1;
    result->dataoffset = 0;     /* never any nulls */
    result->elemtype = OIDOID;
    result->dim1 = n;
    result->lbound1 = 0;

    return result;
}

/*
 *      oidvectorin         - converts "num num ..." to internal form
 */
Datum
oidvectorin(PG_FUNCTION_ARGS)
{
    char       *oidString = PG_GETARG_CSTRING(0);
    oidvector  *result;
    int         n;

    result = (oidvector *) palloc0(OidVectorSize(FUNC_MAX_ARGS));

    for (n = 0; n < FUNC_MAX_ARGS; n++)
    {
        while (*oidString && isspace((unsigned char) *oidString))
            oidString++;
        if (*oidString == '\0')
            break;
        result->values[n] = oidin_subr(oidString, &oidString);
    }
    while (*oidString && isspace((unsigned char) *oidString))
        oidString++;
    if (*oidString)
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                 errmsg("oidvector has too many elements")));

    SET_VARSIZE(result, OidVectorSize(n));
    result->ndim = 1;
    result->dataoffset = 0;     /* never any nulls */
    result->elemtype = OIDOID;
    result->dim1 = n;
    result->lbound1 = 0;

    PG_RETURN_POINTER(result);
}

/*
 *      oidvectorout - converts internal form to "num num ..."
 */
Datum
oidvectorout(PG_FUNCTION_ARGS)
{
    oidvector  *oidArray = (oidvector *) PG_GETARG_POINTER(0);
    int         num,
                nnums = oidArray->dim1;
    char       *rp;
    char       *result;

    /* assumes sign, 10 digits, ' ' */
    rp = result = (char *) palloc(nnums * 12 + 1);
    for (num = 0; num < nnums; num++)
    {
        if (num != 0)
            *rp++ = ' ';
        sprintf(rp, "%u", oidArray->values[num]);
        while (*++rp != '\0')
            ;
    }
    *rp = '\0';
    PG_RETURN_CSTRING(result);
}

/*
 *      oidvectorrecv           - converts external binary format to oidvector
 */
Datum
oidvectorrecv(PG_FUNCTION_ARGS)
{
    LOCAL_FCINFO(locfcinfo, 3);
    StringInfo  buf = (StringInfo) PG_GETARG_POINTER(0);
    oidvector  *result;

    /*
     * Normally one would call array_recv() using DirectFunctionCall3, but
     * that does not work since array_recv wants to cache some data using
     * fcinfo->flinfo->fn_extra.  So we need to pass it our own flinfo
     * parameter.
     */
    InitFunctionCallInfoData(*locfcinfo, fcinfo->flinfo, 3,
                             InvalidOid, NULL, NULL);

    locfcinfo->args[0].value = PointerGetDatum(buf);
    locfcinfo->args[0].isnull = false;
    locfcinfo->args[1].value = ObjectIdGetDatum(OIDOID);
    locfcinfo->args[1].isnull = false;
    locfcinfo->args[2].value = Int32GetDatum(-1);
    locfcinfo->args[2].isnull = false;

    result = (oidvector *) DatumGetPointer(array_recv(locfcinfo));

    Assert(!locfcinfo->isnull);

    /* sanity checks: oidvector must be 1-D, 0-based, no nulls */
    if (ARR_NDIM(result) != 1 ||
        ARR_HASNULL(result) ||
        ARR_ELEMTYPE(result) != OIDOID ||
        ARR_LBOUND(result)[0] != 0)
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_BINARY_REPRESENTATION),
                 errmsg("invalid oidvector data")));

    /* check length for consistency with oidvectorin() */
    if (ARR_DIMS(result)[0] > FUNC_MAX_ARGS)
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                 errmsg("oidvector has too many elements")));

    PG_RETURN_POINTER(result);
}

/*
 *      oidvectorsend           - converts oidvector to binary format
 */
Datum
oidvectorsend(PG_FUNCTION_ARGS)
{
    return array_send(fcinfo);
}

/*
 *      oidparse                - get OID from ICONST/FCONST node
 */
Oid
oidparse(Node *node)
{
    switch (nodeTag(node))
    {
        case T_Integer:
            return intVal(node);
        case T_Float:

            /*
             * Values too large for int4 will be represented as Float
             * constants by the lexer.  Accept these if they are valid OID
             * strings.
             */
            return oidin_subr(strVal(node), NULL);
        default:
            elog(ERROR, "unrecognized node type: %d", (int) nodeTag(node));
    }
    return InvalidOid;          /* keep compiler quiet */
}

/* qsort comparison function for Oids */
int
oid_cmp(const void *p1, const void *p2)
{
    Oid         v1 = *((const Oid *) p1);
    Oid         v2 = *((const Oid *) p2);

    if (v1 < v2)
        return -1;
    if (v1 > v2)
        return 1;
    return 0;
}


/*****************************************************************************
 *   PUBLIC ROUTINES                                                         *
 *****************************************************************************/

Datum
oideq(PG_FUNCTION_ARGS)
{
    Oid         arg1 = PG_GETARG_OID(0);
    Oid         arg2 = PG_GETARG_OID(1);

    PG_RETURN_BOOL(arg1 == arg2);
}

Datum
oidne(PG_FUNCTION_ARGS)
{
    Oid         arg1 = PG_GETARG_OID(0);
    Oid         arg2 = PG_GETARG_OID(1);

    PG_RETURN_BOOL(arg1 != arg2);
}

Datum
oidlt(PG_FUNCTION_ARGS)
{
    Oid         arg1 = PG_GETARG_OID(0);
    Oid         arg2 = PG_GETARG_OID(1);

    PG_RETURN_BOOL(arg1 < arg2);
}

Datum
oidle(PG_FUNCTION_ARGS)
{
    Oid         arg1 = PG_GETARG_OID(0);
    Oid         arg2 = PG_GETARG_OID(1);

    PG_RETURN_BOOL(arg1 <= arg2);
}

Datum
oidge(PG_FUNCTION_ARGS)
{
    Oid         arg1 = PG_GETARG_OID(0);
    Oid         arg2 = PG_GETARG_OID(1);

    PG_RETURN_BOOL(arg1 >= arg2);
}

Datum
oidgt(PG_FUNCTION_ARGS)
{
    Oid         arg1 = PG_GETARG_OID(0);
    Oid         arg2 = PG_GETARG_OID(1);

    PG_RETURN_BOOL(arg1 > arg2);
}

Datum
oidlarger(PG_FUNCTION_ARGS)
{
    Oid         arg1 = PG_GETARG_OID(0);
    Oid         arg2 = PG_GETARG_OID(1);

    PG_RETURN_OID((arg1 > arg2) ? arg1 : arg2);
}

Datum
oidsmaller(PG_FUNCTION_ARGS)
{
    Oid         arg1 = PG_GETARG_OID(0);
    Oid         arg2 = PG_GETARG_OID(1);

    PG_RETURN_OID((arg1 < arg2) ? arg1 : arg2);
}

Datum
oidvectoreq(PG_FUNCTION_ARGS)
{
    int32       cmp = DatumGetInt32(btoidvectorcmp(fcinfo));

    PG_RETURN_BOOL(cmp == 0);
}

Datum
oidvectorne(PG_FUNCTION_ARGS)
{
    int32       cmp = DatumGetInt32(btoidvectorcmp(fcinfo));

    PG_RETURN_BOOL(cmp != 0);
}

Datum
oidvectorlt(PG_FUNCTION_ARGS)
{
    int32       cmp = DatumGetInt32(btoidvectorcmp(fcinfo));

    PG_RETURN_BOOL(cmp < 0);
}

Datum
oidvectorle(PG_FUNCTION_ARGS)
{
    int32       cmp = DatumGetInt32(btoidvectorcmp(fcinfo));

    PG_RETURN_BOOL(cmp <= 0);
}

Datum
oidvectorge(PG_FUNCTION_ARGS)
{
    int32       cmp = DatumGetInt32(btoidvectorcmp(fcinfo));

    PG_RETURN_BOOL(cmp >= 0);
}

Datum
oidvectorgt(PG_FUNCTION_ARGS)
{
    int32       cmp = DatumGetInt32(btoidvectorcmp(fcinfo));

    PG_RETURN_BOOL(cmp > 0);
}