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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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* This file exports two functions: choose_temp_base and make_temp_file. */
#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
#ifndef R_OK
#define R_OK 4
#define W_OK 2
#define X_OK 1
#endif
#include "libiberty.h"
extern int mkstemps ();
#ifndef IN_GCC
#if defined (__MSDOS__) || (defined (_WIN32) && ! defined (__CYGWIN__) && ! defined (_UWIN))
#define DIR_SEPARATOR '\\'
#endif
#endif
#ifndef DIR_SEPARATOR
#define DIR_SEPARATOR '/'
#endif
/* On MSDOS, write temp files in current dir
because there's no place else we can expect to use. */
/* ??? Although the current directory is tried as a last resort,
this is left in so that on MSDOS it is preferred to /tmp on the
off chance that someone requires this, since that was the previous
behaviour. */
#ifdef __MSDOS__
#ifndef P_tmpdir
#define P_tmpdir "."
#endif
#endif
/* Name of temporary file.
mktemp requires 6 trailing X's. */
#define TEMP_FILE "ccXXXXXX"
/* Subroutine of choose_temp_base.
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 char *
try (dir, base)
char *dir, *base;
{
if (base != 0)
return base;
if (dir != 0
&& access (dir, R_OK | W_OK | X_OK) == 0)
return dir;
return 0;
}
/* Return a prefix for temporary file names or 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 (mktemp fails).
The buffer for the result is obtained with xmalloc.
This function is provided for backwards compatability only. It use
is not recommended. */
char *
choose_temp_base ()
{
char *base = 0;
char *temp_filename;
int len;
static char tmp[] = { DIR_SEPARATOR, 't', 'm', 'p', 0 };
static char usrtmp[] = { DIR_SEPARATOR, 'u', 's', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 };
base = try (getenv ("TMPDIR"), base);
base = try (getenv ("TMP"), base);
base = try (getenv ("TEMP"), base);
#ifdef P_tmpdir
base = try (P_tmpdir, base);
#endif
/* Try /usr/tmp, then /tmp. */
base = try (usrtmp, base);
base = try (tmp, base);
/* If all else fails, use the current directory! */
if (base == 0)
base = ".";
len = strlen (base);
temp_filename = xmalloc (len + 1 /*DIR_SEPARATOR*/
+ strlen (TEMP_FILE) + 1);
strcpy (temp_filename, base);
if (len != 0
&& temp_filename[len-1] != '/'
&& temp_filename[len-1] != DIR_SEPARATOR)
temp_filename[len++] = DIR_SEPARATOR;
strcpy (temp_filename + len, TEMP_FILE);
mktemp (temp_filename);
if (strlen (temp_filename) == 0)
abort ();
return temp_filename;
}
/* Return a temporary file name (as a string) or NULL if unable to create
one. */
char *
make_temp_file (suffix)
const char *suffix;
{
char *base = 0;
char *temp_filename;
int base_len, suffix_len;
int fd;
static char tmp[] = { DIR_SEPARATOR, 't', 'm', 'p', 0 };
static char usrtmp[] = { DIR_SEPARATOR, 'u', 's', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 };
base = try (getenv ("TMPDIR"), base);
base = try (getenv ("TMP"), base);
base = try (getenv ("TEMP"), base);
#ifdef P_tmpdir
base = try (P_tmpdir, base);
#endif
/* Try /usr/tmp, then /tmp. */
base = try (usrtmp, base);
base = try (tmp, base);
/* If all else fails, use the current directory! */
if (base == 0)
base = ".";
base_len = strlen (base);
if (suffix)
suffix_len = strlen (suffix);
else
suffix_len = 0;
temp_filename = xmalloc (base_len + 1 /*DIR_SEPARATOR*/
+ strlen (TEMP_FILE)
+ suffix_len + 1);
strcpy (temp_filename, base);
if (base_len != 0
&& temp_filename[base_len-1] != '/'
&& temp_filename[base_len-1] != DIR_SEPARATOR)
temp_filename[base_len++] = DIR_SEPARATOR;
strcpy (temp_filename + base_len, TEMP_FILE);
if (suffix)
strcat (temp_filename, suffix);
fd = mkstemps (temp_filename, suffix_len);
/* If mkstemps failed, then something bad is happening. Maybe we should
issue a message about a possible security attack in progress? */
if (fd == -1)
abort ();
/* Similarly if we can not close the file. */
if (close (fd))
abort ();
return temp_filename;
}
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