int8.h File Reference

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Functions
bool	scanint8 (const char *str, bool errorOK, int64 *result)

Function Documentation

bool scanint8	(	const char *	str,
		bool	errorOK,
		int64 *	result
	)

Definition at line 55 of file int8.c.

References ereport, errcode(), errmsg(), ERROR, PG_INT64_MIN, and sign.

Referenced by int8in(), make_const(), and parse_output_parameters().

{
    const char *ptr = str;
    int64       tmp = 0;
    int         sign = 1;

    /*
     * Do our own scan, rather than relying on sscanf which might be broken
     * for long long.
     */

    /* skip leading spaces */
    while (*ptr && isspace((unsigned char) *ptr))
        ptr++;

    /* handle sign */
    if (*ptr == '-')
    {
        ptr++;

        /*
         * Do an explicit check for INT64_MIN.  Ugly though this is, it's
         * cleaner than trying to get the loop below to handle it portably.
         */
        if (strncmp(ptr, "9223372036854775808", 19) == 0)
        {
            tmp = PG_INT64_MIN;
            ptr += 19;
            goto gotdigits;
        }
        sign = -1;
    }
    else if (*ptr == '+')
        ptr++;

    /* require at least one digit */
    if (!isdigit((unsigned char) *ptr))
    {
        if (errorOK)
            return false;
        else
            ereport(ERROR,
                    (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
                     errmsg("invalid input syntax for integer: \"%s\"",
                            str)));
    }

    /* process digits */
    while (*ptr && isdigit((unsigned char) *ptr))
    {
        int64       newtmp = tmp * 10 + (*ptr++ - '0');

        if ((newtmp / 10) != tmp)   /* overflow? */
        {
            if (errorOK)
                return false;
            else
                ereport(ERROR,
                        (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                         errmsg("value \"%s\" is out of range for type %s",
                                str, "bigint")));
        }
        tmp = newtmp;
    }

gotdigits:

    /* allow trailing whitespace, but not other trailing chars */
    while (*ptr != '\0' && isspace((unsigned char) *ptr))
        ptr++;

    if (*ptr != '\0')
    {
        if (errorOK)
            return false;
        else
            ereport(ERROR,
                    (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
                     errmsg("invalid input syntax for integer: \"%s\"",
                            str)));
    }

    *result = (sign < 0) ? -tmp : tmp;

    return true;
}