text: /* Utility to pick a temporary filename prefix.
     Copyright (C) 1996, 1997, 1998, 2001 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
  #ifdef HAVE_SYS_FILE_H
  #include <sys/file.h>   /* May get R_OK, etc. on some systems.  */
  #endif
  /* APPLE LOCAL begin mainline candidate */
  #include <errno.h>
  #ifdef NEED_DECLARATION_ERRNO
  extern int errno;
  #endif
  /* APPLE LOCAL end mainline candidate */
  
  #ifndef R_OK
  #define R_OK 4
  #define W_OK 2
  #define X_OK 1
  #endif
  
  #include "libiberty.h"
  extern int mkstemps (char *, int);
  
  /* '/' works just fine on MS-DOS based systems.  */
  #ifndef DIR_SEPARATOR
  #define DIR_SEPARATOR '/'
  #endif
  
  /* Name of temporary file.
     mktemp requires 6 trailing X's.  */
  #define TEMP_FILE "ccXXXXXX"
  #define TEMP_FILE_LEN (sizeof(TEMP_FILE) - 1)
  
  /* Subroutine of choose_tmpdir.
     If BASE is non-NULL, return it.
     Otherwise it checks if DIR is a usable directory.
     If success, DIR is returned.
     Otherwise NULL is returned.  */
  
  static inline const char *try_dir (const char *, const char *);
  
  static inline const char *
  try_dir (const char *dir, const char *base)
  {
    if (base != 0)
      return base;
    if (dir != 0
        && access (dir, R_OK | W_OK | X_OK) == 0)
      return dir;
    return 0;
  }
  
  static const char tmp[] = { DIR_SEPARATOR, 't', 'm', 'p', 0 };
  static const char usrtmp[] =
  { DIR_SEPARATOR, 'u', 's', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 };
  static const char vartmp[] =
  { DIR_SEPARATOR, 'v', 'a', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 };
  
  static char *memoized_tmpdir;
  
  /*
  
  @deftypefn Replacement char* choose_tmpdir ()
  
  Returns a pointer to a directory path suitable for creating temporary
  files in.
  
  @end deftypefn
  
  */
  
  char *
  choose_tmpdir (void)
  {
    const char *base = 0;
    char *tmpdir;
    unsigned int len;
  
    if (memoized_tmpdir)
      return memoized_tmpdir;
  
    base = try_dir (getenv ("TMPDIR"), base);
    base = try_dir (getenv ("TMP"), base);
    base = try_dir (getenv ("TEMP"), base);
  
  #ifdef P_tmpdir
    base = try_dir (P_tmpdir, base);
  #endif
  
    /* Try /var/tmp, /usr/tmp, then /tmp.  */
    base = try_dir (vartmp, base);
    base = try_dir (usrtmp, base);
    base = try_dir (tmp, base);
   
    /* If all else fails, use the current directory!  */
    if (base == 0)
      base = ".";
  
    /* Append DIR_SEPARATOR to the directory we've chosen
       and return it.  */
    len = strlen (base);
    tmpdir = XNEWVEC (char, len + 2);
    strcpy (tmpdir, base);
    tmpdir[len] = DIR_SEPARATOR;
    tmpdir[len+1] = '\0';
  
    memoized_tmpdir = tmpdir;
    return tmpdir;
  }
  
  /*
  
  @deftypefn Replacement char* make_temp_file (const char *@var{suffix})
  
  Return a temporary file name (as a string) or @code{NULL} if unable to
  create one.  @var{suffix} is a suffix to append to the file name.  The
  string is @code{malloc}ed, and the temporary file has been created.
  
  @end deftypefn
  
  */
  
  char *
  make_temp_file (const char *suffix)
  {
    const char *base = choose_tmpdir ();
    char *temp_filename;
    int base_len, suffix_len;
    int fd;
  
    if (suffix == 0)
      suffix = "";
  
    base_len = strlen (base);
    suffix_len = strlen (suffix);
  
    temp_filename = XNEWVEC (char, base_len
  			   + TEMP_FILE_LEN
  			   + suffix_len + 1);
    strcpy (temp_filename, base);
    strcpy (temp_filename + base_len, TEMP_FILE);
    strcpy (temp_filename + base_len + TEMP_FILE_LEN, suffix);
  
    fd = mkstemps (temp_filename, suffix_len);
  
    /* APPLE LOCAL begin mainline candidate */
    /* If mkstemps failed something bad is happening, send an error message
       and exit.  */
    if (fd == -1)
      {
        fprintf (stderr, "Failed to open temp file in %s, error: %s\n", base, xstrerror(errno));
        xexit (1);
      }
    /* Similarly if we can not close the file.  */
    if (close (fd))
      {
        fprintf (stderr, "Failed to close temp file in %s, error: %s\n", base, xstrerror(errno));
        xexit (1);
      }
    /* APPLE LOCAL end mainline candidate */
    return temp_filename;
  }
  