1  /* Utility to pick a temporary filename prefix.
       2     Copyright (C) 1996-2023 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., 51 Franklin Street - Fifth Floor,
      18  Boston, MA 02110-1301, USA.  */
      19  
      20  #ifdef HAVE_CONFIG_H
      21  #include "config.h"
      22  #endif
      23  
      24  #include <stdio.h>	/* May get P_tmpdir.  */
      25  #include <sys/types.h>
      26  #ifdef HAVE_UNISTD_H
      27  #include <unistd.h>
      28  #endif
      29  #ifdef HAVE_STDLIB_H
      30  #include <stdlib.h>
      31  #endif
      32  #ifdef HAVE_STRING_H
      33  #include <string.h>
      34  #endif
      35  
      36  #include "libiberty.h"
      37  
      38  /* Name of temporary file.
      39     mktemp requires 6 trailing X's.  */
      40  #define TEMP_FILE "ccXXXXXX"
      41  #define TEMP_FILE_LEN (sizeof(TEMP_FILE) - 1)
      42  
      43  /*
      44  
      45  @deftypefn Extension char* choose_temp_base (void)
      46  
      47  Return a prefix for temporary file names or @code{NULL} if unable to
      48  find one.  The current directory is chosen if all else fails so the
      49  program is exited if a temporary directory can't be found (@code{mktemp}
      50  fails).  The buffer for the result is obtained with @code{xmalloc}.
      51  
      52  This function is provided for backwards compatibility only.  Its use is
      53  not recommended.
      54  
      55  @end deftypefn
      56  
      57  */
      58  
      59  char *
      60  choose_temp_base (void)
      61  {
      62    const char *base = choose_tmpdir ();
      63    char *temp_filename;
      64    int len;
      65  
      66    len = strlen (base);
      67    temp_filename = XNEWVEC (char, len + TEMP_FILE_LEN + 1);
      68    strcpy (temp_filename, base);
      69    strcpy (temp_filename + len, TEMP_FILE);
      70  
      71    if (mktemp (temp_filename) == 0)
      72      abort ();
      73    return temp_filename;
      74  }