libiberty/choose-temp.c

   1 /* Utility to pick a temporary filename prefix.
   2    Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
   3
   4 This file is part of the libiberty library.
   5 Libiberty is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU Library General Public
   7 License as published by the Free Software Foundation; either
   8 version 2 of the License, or (at your option) any later version.
   9
  10 Libiberty is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with libiberty; see the file COPYING.LIB.  If not,
  17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18 Boston, MA 02111-1307, USA.  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #include <stdio.h>      /* May get P_tmpdir.  */
  25 #ifdef HAVE_STDLIB_H
  26 #include <stdlib.h>
  27 #endif
  28 #ifdef HAVE_STRING_H
  29 #include <string.h>
  30 #endif
  31
  32 #include "libiberty.h"
  33 extern char *choose_tmpdir PARAMS ((void));
  34
  35 /* Name of temporary file.
  36    mktemp requires 6 trailing X's.  */
  37 #define TEMP_FILE "ccXXXXXX"
  38 #define TEMP_FILE_LEN (sizeof(TEMP_FILE) - 1)
  39
  40 /*
  41
  42 @deftypefn Extension char* choose_temp_base (void)
  43
  44 Return a prefix for temporary file names or @code{NULL} if unable to
  45 find one.  The current directory is chosen if all else fails so the
  46 program is exited if a temporary directory can't be found (@code{mktemp}
  47 fails).  The buffer for the result is obtained with @code{xmalloc}.
  48
  49 This function is provided for backwards compatability only.  Its use is
  50 not recommended.
  51
  52 @end deftypefn
  53
  54 */
  55
  56 char *
  57 choose_temp_base ()
  58 {
  59   const char *base = choose_tmpdir ();
  60   char *temp_filename;
  61   int len;
  62
  63   len = strlen (base);
  64   temp_filename = xmalloc (len + TEMP_FILE_LEN + 1);
  65   strcpy (temp_filename, base);
  66   strcpy (temp_filename + len, TEMP_FILE);
  67
  68   mktemp (temp_filename);
  69   if (strlen (temp_filename) == 0)
  70     abort ();
  71   return temp_filename;
  72 }