Sat Apr 20 17:07:17 1996 Ulrich Drepper <drepper@cygnus.com>
[kopensolaris-gnu/glibc.git] / time / scheck.c
1 #ifndef lint
2 #ifndef NOID
3 static char     elsieid[] = "@(#)scheck.c       8.13";
4 #endif /* !defined lint */
5 #endif /* !defined NOID */
6
7 /*LINTLIBRARY*/
8
9 #include "private.h"
10
11 extern char *   imalloc P((int n));
12 extern void     ifree P((char * p));
13
14 char *
15 scheck(string, format)
16 const char * const      string;
17 char * const            format;
18 {
19         register char *         fbuf;
20         register const char *   fp;
21         register char *         tp;
22         register int            c;
23         register char *         result;
24         char                    dummy;
25         static char             nada;
26
27         result = &nada;
28         if (string == NULL || format == NULL)
29                 return result;
30         fbuf = imalloc((int) (2 * strlen(format) + 4));
31         if (fbuf == NULL)
32                 return result;
33         fp = format;
34         tp = fbuf;
35         while ((*tp++ = c = *fp++) != '\0') {
36                 if (c != '%')
37                         continue;
38                 if (*fp == '%') {
39                         *tp++ = *fp++;
40                         continue;
41                 }
42                 *tp++ = '*';
43                 if (*fp == '*')
44                         ++fp;
45                 while (is_digit(*fp))
46                         *tp++ = *fp++;
47                 if (*fp == 'l' || *fp == 'h')
48                         *tp++ = *fp++;
49                 else if (*fp == '[')
50                         do *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 }