b9fb3c420b
Mon Feb 23 14:33:15 1998 Ian Lance Taylor <ian@cygnus.com>
* choose-temp.c: Fix handling of sys/file.h to work in libiberty.
From-SVN: r18240
152 lines
4.2 KiB
C
152 lines
4.2 KiB
C
/* 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 one function: choose_temp_base. */
|
|
|
|
/* This file lives in at least two places: libiberty and gcc.
|
|
Don't change one without the other. */
|
|
|
|
#if defined (IN_GCC) || defined (HAVE_CONFIG_H)
|
|
#include "config.h"
|
|
#endif
|
|
|
|
/* If we are in gcc, or we have a config.h, we assume that
|
|
HAVE_SYS_FILE_H tells us whether to include sys/file.h. However,
|
|
libiberty does not have a config.h, and instead arranges to define
|
|
NO_SYS_FILE_H on the command line when there is no sys/file.h. */
|
|
|
|
#if (defined (IN_GCC) || defined (HAVE_CONFIG_H)) ? defined (HAVE_SYS_FILE_H) : ! defined (NO_SYS_FILE_H)
|
|
#include <sys/types.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 <stdio.h> /* May get P_tmpdir. */
|
|
|
|
#ifdef IN_GCC
|
|
#include "gansidecl.h"
|
|
extern char *xmalloc ();
|
|
#else
|
|
#include "ansidecl.h"
|
|
#include "libiberty.h"
|
|
#if defined (__MSDOS__) || defined (_WIN32)
|
|
#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. */
|
|
|
|
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 };
|
|
|
|
#ifndef MPW
|
|
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 = ".";
|
|
|
|
#else /* MPW */
|
|
base = ":";
|
|
#endif
|
|
|
|
len = strlen (base);
|
|
temp_filename = xmalloc (len + 1 /*DIR_SEPARATOR*/
|
|
+ strlen (TEMP_FILE) + 1);
|
|
strcpy (temp_filename, base);
|
|
|
|
#ifndef MPW
|
|
if (len != 0
|
|
&& temp_filename[len-1] != '/'
|
|
&& temp_filename[len-1] != DIR_SEPARATOR)
|
|
temp_filename[len++] = DIR_SEPARATOR;
|
|
#else /* MPW */
|
|
if (temp_filename[len-1] != ':')
|
|
temp_filename[len++] = ':';
|
|
#endif /* MPW */
|
|
strcpy (temp_filename + len, TEMP_FILE);
|
|
|
|
mktemp (temp_filename);
|
|
if (strlen (temp_filename) == 0)
|
|
abort ();
|
|
return temp_filename;
|
|
}
|