stdio-common/tmpfile.c

   1 /* Copyright (C) 1991, 1993, 1996 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
  21
  22 /* This returns a new stream opened on a temporary file (generated
  23    by tmpnam) The file is opened with mode "w+b" (binary read/write).
  24    If we couldn't generate a unique filename or the file couldn't
  25    be opened, NULL is returned.  */
  26 FILE *
  27 tmpfile ()
  28 {
  29   char buf[FILENAME_MAX];
  30   char *filename;
  31   FILE *f;
  32
  33   filename = __stdio_gen_tempname (buf, sizeof (buf), (char *) NULL, "tmpf", 0,
  34                                    (size_t *) NULL, &f);
  35   if (filename == NULL)
  36     return NULL;
  37
  38   /* Note that this relies on the Unix semantics that
  39      a file is not really removed until it is closed.  */
  40   (void) remove (filename);
  41
  42   return f;
  43 }