granicus.if.org Git - postgresql/blob - src/timezone/scheck.c

   1 /*
   2  * This file is in the public domain, so clarified as of
   3  * 2006-07-17 by Arthur David Olson.
   4  *
   5  * IDENTIFICATION
   6  *        $PostgreSQL: pgsql/src/timezone/scheck.c,v 1.9 2008/02/16 21:16:04 tgl Exp $
   7  */
   8
   9 #include "postgres_fe.h"
  10
  11 #include "private.h"
  12
  13
  14 const char *
  15 scheck(const char *string, const char *format)
  16 {
  17         char       *fbuf;
  18         const char *fp;
  19         char       *tp;
  20         int                     c;
  21         const char *result;
  22         char            dummy;
  23
  24         result = "";
  25         if (string == NULL || format == NULL)
  26                 return result;
  27         fbuf = imalloc((int) (2 * strlen(format) + 4));
  28         if (fbuf == NULL)
  29                 return result;
  30         fp = format;
  31         tp = fbuf;
  32         while ((*tp++ = c = *fp++) != '\0')
  33         {
  34                 if (c != '%')
  35                         continue;
  36                 if (*fp == '%')
  37                 {
  38                         *tp++ = *fp++;
  39                         continue;
  40                 }
  41                 *tp++ = '*';
  42                 if (*fp == '*')
  43                         ++fp;
  44                 while (is_digit(*fp))
  45                         *tp++ = *fp++;
  46                 if (*fp == 'l' || *fp == 'h')
  47                         *tp++ = *fp++;
  48                 else if (*fp == '[')
  49                         do
  50                                 *tp++ = *fp++;
  51                         while (*fp != '\0' && *fp != ']');
  52                 if ((*tp++ = *fp++) == '\0')
  53                         break;
  54         }
  55         *(tp - 1) = '%';
  56         *tp++ = 'c';
  57         *tp = '\0';
  58         if (sscanf(string, fbuf, &dummy) != 1)
  59                 result = (char *) format;
  60         ifree(fbuf);
  61         return result;
  62 }