char.c File Reference

#include "postgres.h"
#include <limits.h>
#include "libpq/pqformat.h"
#include "utils/builtins.h"

Include dependency graph for char.c:

Go to the source code of this file.

Functions
Datum	charin (PG_FUNCTION_ARGS)
Datum	charout (PG_FUNCTION_ARGS)
Datum	charrecv (PG_FUNCTION_ARGS)
Datum	charsend (PG_FUNCTION_ARGS)
Datum	chareq (PG_FUNCTION_ARGS)
Datum	charne (PG_FUNCTION_ARGS)
Datum	charlt (PG_FUNCTION_ARGS)
Datum	charle (PG_FUNCTION_ARGS)
Datum	chargt (PG_FUNCTION_ARGS)
Datum	charge (PG_FUNCTION_ARGS)
Datum	chartoi4 (PG_FUNCTION_ARGS)
Datum	i4tochar (PG_FUNCTION_ARGS)
Datum	text_char (PG_FUNCTION_ARGS)
Datum	char_text (PG_FUNCTION_ARGS)

Function Documentation

Datum char_text

(

PG_FUNCTION_ARGS

)

Definition at line 195 of file char.c.

References palloc(), PG_GETARG_CHAR, PG_RETURN_TEXT_P, SET_VARSIZE, VARDATA, and VARHDRSZ.

{
    char        arg1 = PG_GETARG_CHAR(0);
    text       *result = palloc(VARHDRSZ + 1);

    /*
     * Convert \0 to an empty string, for consistency with charout (and
     * because the text stuff doesn't like embedded nulls all that well).
     */
    if (arg1 != '\0')
    {
        SET_VARSIZE(result, VARHDRSZ + 1);
        *(VARDATA(result)) = arg1;
    }
    else
        SET_VARSIZE(result, VARHDRSZ);

    PG_RETURN_TEXT_P(result);
}

Datum chareq

(

PG_FUNCTION_ARGS

)

Definition at line 99 of file char.c.

References PG_GETARG_CHAR, and PG_RETURN_BOOL.

{
    char        arg1 = PG_GETARG_CHAR(0);
    char        arg2 = PG_GETARG_CHAR(1);

    PG_RETURN_BOOL(arg1 == arg2);
}

Datum charge

(

PG_FUNCTION_ARGS

)

Definition at line 144 of file char.c.

References PG_GETARG_CHAR, and PG_RETURN_BOOL.

{
    char        arg1 = PG_GETARG_CHAR(0);
    char        arg2 = PG_GETARG_CHAR(1);

    PG_RETURN_BOOL((uint8) arg1 >= (uint8) arg2);
}

Datum chargt

(

PG_FUNCTION_ARGS

)

Definition at line 135 of file char.c.

References PG_GETARG_CHAR, and PG_RETURN_BOOL.

{
    char        arg1 = PG_GETARG_CHAR(0);
    char        arg2 = PG_GETARG_CHAR(1);

    PG_RETURN_BOOL((uint8) arg1 > (uint8) arg2);
}

Datum charin

(

PG_FUNCTION_ARGS

)

Definition at line 33 of file char.c.

References PG_GETARG_CSTRING, and PG_RETURN_CHAR.

{
    char       *ch = PG_GETARG_CSTRING(0);

    PG_RETURN_CHAR(ch[0]);
}

Datum charle

(

PG_FUNCTION_ARGS

)

Definition at line 126 of file char.c.

References PG_GETARG_CHAR, and PG_RETURN_BOOL.

{
    char        arg1 = PG_GETARG_CHAR(0);
    char        arg2 = PG_GETARG_CHAR(1);

    PG_RETURN_BOOL((uint8) arg1 <= (uint8) arg2);
}

Datum charlt

(

PG_FUNCTION_ARGS

)

Definition at line 117 of file char.c.

References PG_GETARG_CHAR, and PG_RETURN_BOOL.

{
    char        arg1 = PG_GETARG_CHAR(0);
    char        arg2 = PG_GETARG_CHAR(1);

    PG_RETURN_BOOL((uint8) arg1 < (uint8) arg2);
}

Datum charne

(

PG_FUNCTION_ARGS

)

Definition at line 108 of file char.c.

References PG_GETARG_CHAR, and PG_RETURN_BOOL.

{
    char        arg1 = PG_GETARG_CHAR(0);
    char        arg2 = PG_GETARG_CHAR(1);

    PG_RETURN_BOOL(arg1 != arg2);
}

Datum charout

(

PG_FUNCTION_ARGS

)

Definition at line 48 of file char.c.

References palloc(), PG_GETARG_CHAR, and PG_RETURN_CSTRING.

{
    char        ch = PG_GETARG_CHAR(0);
    char       *result = (char *) palloc(2);

    result[0] = ch;
    result[1] = '\0';
    PG_RETURN_CSTRING(result);
}

Datum charrecv

(

PG_FUNCTION_ARGS

)

Definition at line 66 of file char.c.

References buf, PG_GETARG_POINTER, PG_RETURN_CHAR, and pq_getmsgbyte().

{
    StringInfo  buf = (StringInfo) PG_GETARG_POINTER(0);

    PG_RETURN_CHAR(pq_getmsgbyte(buf));
}

Datum charsend

(

PG_FUNCTION_ARGS

)

Definition at line 77 of file char.c.

References buf, PG_GETARG_CHAR, PG_RETURN_BYTEA_P, pq_begintypsend(), pq_endtypsend(), and pq_sendbyte().

{
    char        arg1 = PG_GETARG_CHAR(0);
    StringInfoData buf;

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

Datum chartoi4

(

PG_FUNCTION_ARGS

)

Definition at line 154 of file char.c.

References PG_GETARG_CHAR, and PG_RETURN_INT32.

{
    char        arg1 = PG_GETARG_CHAR(0);

    PG_RETURN_INT32((int32) ((int8) arg1));
}

Datum i4tochar

(

PG_FUNCTION_ARGS

)

Definition at line 162 of file char.c.

References ereport, errcode(), errmsg(), ERROR, PG_GETARG_INT32, and PG_RETURN_CHAR.

{
    int32       arg1 = PG_GETARG_INT32(0);

    if (arg1 < SCHAR_MIN || arg1 > SCHAR_MAX)
        ereport(ERROR,
                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                 errmsg("\"char\" out of range")));

    PG_RETURN_CHAR((int8) arg1);
}

Datum text_char

(

PG_FUNCTION_ARGS

)

Definition at line 176 of file char.c.

References PG_GETARG_TEXT_PP, PG_RETURN_CHAR, VARDATA_ANY, and VARSIZE_ANY_EXHDR.

{
    text       *arg1 = PG_GETARG_TEXT_PP(0);
    char        result;

    /*
     * An empty input string is converted to \0 (for consistency with charin).
     * If the input is longer than one character, the excess data is silently
     * discarded.
     */
    if (VARSIZE_ANY_EXHDR(arg1) > 0)
        result = *(VARDATA_ANY(arg1));
    else
        result = '\0';

    PG_RETURN_CHAR(result);
}