src/temp/mktemp.c

   1 #define _GNU_SOURCE
   2 #include <string.h>
   3 #include <stdlib.h>
   4 #include <errno.h>
   5 #include <sys/stat.h>
   6
   7 char *__randname(char *);
   8
   9 char *mktemp(char *template)
  10 {
  11         size_t l = strlen(template);
  12         int retries = 100;
  13         struct stat st;
  14
  15         if (l < 6 || memcmp(template+l-6, "XXXXXX", 6)) {
  16                 errno = EINVAL;
  17                 *template = 0;
  18                 return template;
  19         }
  20
  21         do {
  22                 __randname(template+l-6);
  23                 if (stat(template, &st)) {
  24                         if (errno != ENOENT) *template = 0;
  25                         return template;
  26                 }
  27         } while (--retries);
  28
  29         *template = 0;
  30         errno = EEXIST;
  31         return template;
  32 }