scheck.c

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/*
 * This file is in the public domain, so clarified as of
 * 2006-07-17 by Arthur David Olson.
 *
 * IDENTIFICATION
 *    src/timezone/scheck.c
 */

#include "postgres_fe.h"

#include "private.h"


const char *
scheck(const char *string, const char *format)
{
    char       *fbuf;
    const char *fp;
    char       *tp;
    int         c;
    const char *result;
    char        dummy;

    result = "";
    if (string == NULL || format == NULL)
        return result;
    fbuf = imalloc((int) (2 * strlen(format) + 4));
    if (fbuf == NULL)
        return result;
    fp = format;
    tp = fbuf;
    while ((*tp++ = c = *fp++) != '\0')
    {
        if (c != '%')
            continue;
        if (*fp == '%')
        {
            *tp++ = *fp++;
            continue;
        }
        *tp++ = '*';
        if (*fp == '*')
            ++fp;
        while (is_digit(*fp))
            *tp++ = *fp++;
        if (*fp == 'l' || *fp == 'h')
            *tp++ = *fp++;
        else if (*fp == '[')
            do
                *tp++ = *fp++;
            while (*fp != '\0' && *fp != ']');
        if ((*tp++ = *fp++) == '\0')
            break;
    }
    *(tp - 1) = '%';
    *tp++ = 'c';
    *tp = '\0';
    if (sscanf(string, fbuf, &dummy) != 1)
        result = (char *) format;
    ifree(fbuf);
    return result;
}