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
   6 #ifndef lint
   7 #ifndef NOID
   8 static char     elsieid[] = "@(#)scheck.c       8.19";
   9 #endif /* !defined lint */
  10 #endif /* !defined NOID */
  11
  12 /*LINTLIBRARY*/
  13
  14 #include "private.h"
  15
  16 const char *
  17 scheck(string, format)
  18 const char * const      string;
  19 const char * const      format;
  20 {
  21         register char *         fbuf;
  22         register const char *   fp;
  23         register char *         tp;
  24         register int            c;
  25         register const char *   result;
  26         char                    dummy;
  27
  28         result = "";
  29         if (string == NULL || format == NULL)
  30                 return result;
  31         fbuf = imalloc((int) (2 * strlen(format) + 4));
  32         if (fbuf == NULL)
  33                 return result;
  34         fp = format;
  35         tp = fbuf;
  36         while ((*tp++ = c = *fp++) != '\0') {
  37                 if (c != '%')
  38                         continue;
  39                 if (*fp == '%') {
  40                         *tp++ = *fp++;
  41                         continue;
  42                 }
  43                 *tp++ = '*';
  44                 if (*fp == '*')
  45                         ++fp;
  46                 while (is_digit(*fp))
  47                         *tp++ = *fp++;
  48                 if (*fp == 'l' || *fp == 'h')
  49                         *tp++ = *fp++;
  50                 else if (*fp == '[')
  51                         do *tp++ = *fp++;
  52                                 while (*fp != '\0' && *fp != ']');
  53                 if ((*tp++ = *fp++) == '\0')
  54                         break;
  55         }
  56         *(tp - 1) = '%';
  57         *tp++ = 'c';
  58         *tp = '\0';
  59         if (sscanf(string, fbuf, &dummy) != 1)
  60                 result = (char *) format;
  61         ifree(fbuf);
  62         return result;
  63 }