tmpnam.c revision 60484 
1#include <stdio.h>
2
3#ifndef L_tmpnam
4#define L_tmpnam 100
5#endif
6#ifndef P_tmpdir
7#define P_tmpdir "/usr/tmp"
8#endif
9
10static char tmpnam_buffer[L_tmpnam];
11static int tmpnam_counter;
12
13extern int getpid ();
14
15char *
16tmpnam (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}
40