libiberty/tmpnam.c

   1 #include <stdio.h>
   2
   3 #ifndef L_tmpnam
   4 #define L_tmpname 100
   5 #endif
   6 #ifndef P_tmpdir
   7 #define P_tmpdir "/usr/tmp"
   8 #endif
   9
  10 static char tmpnam_buffer[L_tmpnam];
  11 static int tmpnam_counter;
  12
  13 extern int getpid ();
  14
  15 char *
  16 tmpnam (s)
  17      char *s;
  18 {
  19   int pid = getpid ();
  20
  21   if (s == NULL)
  22     s = tmpnam_buffer;
  23
  24   /*  Generate the filename and make sure that there isn't one called
  25       it already.  */
  26
  27   while (1)
  28     {
  29       FILE *f;
  30       sprintf (s, "%s/%s%x.%x", P_tmpdir, "t", pid, tmpnam_counter);
  31       f = fopen (s, "r");
  32       if (f == NULL)
  33         break;
  34       tmpnam_counter++;
  35       fclose (f);
  36     }
  37
  38   return s;
  39 }