zic.tproj/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
   6 #ifndef lint
   7 #ifndef NOID
   8 static const char       elsieid[] = "@(#)scheck.c       8.19";
   9 #endif /* !defined lint */
  10 #endif /* !defined NOID */
  11
  12 #ifndef lint
  13 static const char rcsid[] =
  14   "$FreeBSD: head/contrib/tzcode/zic/scheck.c 192625 2009-05-23 06:31:50Z edwin $";
  15 #endif /* not lint */
  16
  17 /*LINTLIBRARY*/
  18
  19 #include "private.h"
  20
  21 const char *
  22 scheck(string, format)
  23 const char * const      string;
  24 const char * const      format;
  25 {
  26         register char *         fbuf;
  27         register const char *   fp;
  28         register char *         tp;
  29         register int            c;
  30         register const char *   result;
  31         char                    dummy;
  32
  33         result = "";
  34         if (string == NULL || format == NULL)
  35                 return result;
  36         fbuf = imalloc((int) (2 * strlen(format) + 4));
  37         if (fbuf == NULL)
  38                 return result;
  39         fp = format;
  40         tp = fbuf;
  41         while ((*tp++ = c = *fp++) != '\0') {
  42                 if (c != '%')
  43                         continue;
  44                 if (*fp == '%') {
  45                         *tp++ = *fp++;
  46                         continue;
  47                 }
  48                 *tp++ = '*';
  49                 if (*fp == '*')
  50                         ++fp;
  51                 while (is_digit(*fp))
  52                         *tp++ = *fp++;
  53                 if (*fp == 'l' || *fp == 'h')
  54                         *tp++ = *fp++;
  55                 else if (*fp == '[')
  56                         do *tp++ = *fp++;
  57                                 while (*fp != '\0' && *fp != ']');
  58                 if ((*tp++ = *fp++) == '\0')
  59                         break;
  60         }
  61         *(tp - 1) = '%';
  62         *tp++ = 'c';
  63         *tp = '\0';
  64         if (sscanf(string, fbuf, &dummy) != 1)
  65                 result = (char *) format;
  66         ifree(fbuf);
  67         return result;
  68 }