stdio-common/tmpfile.c

   1 /* Copyright (C) 1991, 1993 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
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <stdio.h>
  21
  22
  23 /* This returns a new stream opened on a temporary file (generated
  24    by tmpnam) The file is opened with mode "w+b" (binary read/write).
  25    If we couldn't generate a unique filename or the file couldn't
  26    be opened, NULL is returned.  */
  27 FILE *
  28 DEFUN_VOID(tmpfile)
  29 {
  30   char *filename;
  31   FILE *f;
  32
  33   filename = __stdio_gen_tempname ((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 }