path.c

   1 #undef _GNU_SOURCE
   2 #define _GNU_SOURCE
   3 #include <string.h>
   4
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7
   8 #ifdef ALT_PATH_SEP
   9 #define SEP ';'
  10 #else
  11 #define SEP ':'
  12 #endif
  13
  14 char *path_search(char *name, char *mode, char *path)
  15 {
  16         FILE *f;
  17         static char *buf;
  18         char *p, *n;
  19         int l;
  20
  21         if (buf) free(buf);
  22         buf = 0;
  23         if (!path || !*path || *name == '/')
  24                 return (buf = strdup(name));
  25
  26         buf = malloc(strlen(path) + strlen(name) + 2);
  27
  28         for (p = path; *p; p += l)
  29         {
  30                 if (*p == SEP) p++;
  31                 n = strchr(p, SEP);
  32                 if (n) l = n - p;
  33                 else l = strlen(p);
  34                 strncpy(buf, p, l);
  35                 buf[l] = '/';
  36                 strcpy(buf+l+1, name);
  37                 if ((f = fopen(buf, mode)))
  38                 {
  39                         fclose(f);
  40                         return buf;
  41                 }
  42         }
  43         return name;
  44 }
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