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/* Utility to pick a temporary filename prefix.

   Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.

This file is part of the libiberty library.

Libiberty is free software; you can redistribute it and/or

modify it under the terms of the GNU Library General Public

License as published by the Free Software Foundation; either

version 2 of the License, or (at your option) any later version.

Libiberty is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

Library General Public License for more details.

You should have received a copy of the GNU Library General Public

License along with libiberty; see the file COPYING.LIB.  If not,

write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,

Boston, MA 02110-1301, USA.  */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <stdio.h>      /* May get P_tmpdir.  */

#include <sys/types.h>

#ifdef HAVE_UNISTD_H

#include <unistd.h>

#endif

#ifdef HAVE_STDLIB_H

#include <stdlib.h>

#endif

#ifdef HAVE_STRING_H

#include <string.h>

#endif

#include "libiberty.h"

extern char *choose_tmpdir (void);

/* Name of temporary file.

   mktemp requires 6 trailing X's.  */

#define TEMP_FILE "ccXXXXXX"

#define TEMP_FILE_LEN (sizeof(TEMP_FILE) - 1)

/*

@deftypefn Extension char* choose_temp_base (void)

Return a prefix for temporary file names or @code{NULL} if unable to

find one.  The current directory is chosen if all else fails so the

program is exited if a temporary directory can't be found (@code{mktemp}

fails).  The buffer for the result is obtained with @code{xmalloc}.

This function is provided for backwards compatibility only.  Its use is

not recommended.

@end deftypefn

*/

char *

choose_temp_base (void)

{

  const char *base = choose_tmpdir ();

  char *temp_filename;

  int len;

  len = strlen (base);

  temp_filename = XNEWVEC (char, len + TEMP_FILE_LEN + 1);

  strcpy (temp_filename, base);

  strcpy (temp_filename + len, TEMP_FILE);

  if (mktemp (temp_filename) == 0)

    abort ();

  return temp_filename;

}