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/*

@deftypefn Supplemental char* tmpnam (char *@var{s})

This function attempts to create a name for a temporary file, which

will be a valid file name yet not exist when @code{tmpnam} checks for

it.  @var{s} must point to a buffer of at least @code{L_tmpnam} bytes,

or be @code{NULL}.  Use of this function creates a security risk, and it must

not be used in new projects.  Use @code{mkstemp} instead.

@end deftypefn

*/

#include <stdio.h>

#ifndef L_tmpnam

#define L_tmpnam 100

#endif

#ifndef P_tmpdir

#define P_tmpdir "/usr/tmp"

#endif

static char tmpnam_buffer[L_tmpnam];

static int tmpnam_counter;

extern int getpid (void);

char *

tmpnam (char *s)

{

  int pid = getpid ();

  if (s == NULL)

    s = tmpnam_buffer;

  /*  Generate the filename and make sure that there isn't one called

      it already.  */

  while (1)

    {

      FILE *f;

      sprintf (s, "%s/%s%x.%x", P_tmpdir, "t", pid, tmpnam_counter);

      f = fopen (s, "r");

      if (f == NULL)

        break;

      tmpnam_counter++;

      fclose (f);

    }

  return s;

}