int8.h File Reference

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

Function Documentation

scanint8()

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, pg_mul_s64_overflow(), pg_sub_s64_overflow(), generate_unaccent_rules::str, and unlikely.

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

{
    const char *ptr = str;
    int64       tmp = 0;
    bool        neg = false;

    /*
     * Do our own scan, rather than relying on sscanf which might be broken
     * for long long.
     *
     * As INT64_MIN can't be stored as a positive 64 bit integer, accumulate
     * value as a negative number.
     */

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

    /* handle sign */
    if (*ptr == '-')
    {
        ptr++;
        neg = true;
    }
    else if (*ptr == '+')
        ptr++;

    /* require at least one digit */
    if (unlikely(!isdigit((unsigned char) *ptr)))
        goto invalid_syntax;

    /* process digits */
    while (*ptr && isdigit((unsigned char) *ptr))
    {
        int8        digit = (*ptr++ - '0');

        if (unlikely(pg_mul_s64_overflow(tmp, 10, &tmp)) ||
            unlikely(pg_sub_s64_overflow(tmp, digit, &tmp)))
            goto out_of_range;
    }

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

    if (unlikely(*ptr != '\0'))
        goto invalid_syntax;

    if (!neg)
    {
        /* could fail if input is most negative number */
        if (unlikely(tmp == PG_INT64_MIN))
            goto out_of_range;
        tmp = -tmp;
    }

    *result = tmp;
    return true;

out_of_range:
    if (!errorOK)
        ereport(ERROR,
                (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
                 errmsg("value \"%s\" is out of range for type %s",
                        str, "bigint")));
    return false;

invalid_syntax:
    if (!errorOK)
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
                 errmsg("invalid input syntax for type %s: \"%s\"",
                        "bigint", str)));
    return false;
}