stdio-common/tmpnam_r.c

   1 /* Copyright (C) 1991, 1993, 1996, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <stdio.h>
  20 #include <string.h>
  21
  22
  23 /* Generate a unique filename in P_tmpdir.  If S is NULL return NULL.
  24    This makes this function thread safe.  */
  25 char *
  26 tmpnam_r (char *s)
  27 {
  28   if (s == NULL)
  29     return NULL;
  30
  31   /* In the following call we use the buffer pointed to by S if
  32      non-NULL although we don't know the size.  But we limit the size
  33      to L_tmpnam characters in any case.  */
  34   return __stdio_gen_tempname (s, L_tmpnam, (const char *) NULL,
  35                                (const char *) NULL, 0,
  36                                (size_t *) NULL, (FILE **) NULL, 0);
  37 }