178 lines
4.4 KiB
C
178 lines
4.4 KiB
C
/* Utility to pick a temporary filename prefix.
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Copyright (C) 1996, 1997, 1998, 2001 Free Software Foundation, Inc.
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This file is part of the libiberty library.
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Libiberty is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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Libiberty is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with libiberty; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdio.h> /* May get P_tmpdir. */
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#include <sys/types.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#ifdef HAVE_SYS_FILE_H
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#include <sys/file.h> /* May get R_OK, etc. on some systems. */
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#endif
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#ifndef R_OK
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#define R_OK 4
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#define W_OK 2
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#define X_OK 1
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#endif
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#include "libiberty.h"
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extern int mkstemps (char *, int);
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/* '/' works just fine on MS-DOS based systems. */
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#ifndef DIR_SEPARATOR
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#define DIR_SEPARATOR '/'
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#endif
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/* Name of temporary file.
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mktemp requires 6 trailing X's. */
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#define TEMP_FILE "ccXXXXXX"
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#define TEMP_FILE_LEN (sizeof(TEMP_FILE) - 1)
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/* Subroutine of choose_tmpdir.
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If BASE is non-NULL, return it.
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Otherwise it checks if DIR is a usable directory.
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If success, DIR is returned.
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Otherwise NULL is returned. */
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static inline const char *try_dir (const char *, const char *);
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static inline const char *
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try_dir (const char *dir, const char *base)
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{
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if (base != 0)
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return base;
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if (dir != 0
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&& access (dir, R_OK | W_OK | X_OK) == 0)
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return dir;
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return 0;
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}
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static const char tmp[] = { DIR_SEPARATOR, 't', 'm', 'p', 0 };
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static const char usrtmp[] =
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{ DIR_SEPARATOR, 'u', 's', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 };
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static const char vartmp[] =
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{ DIR_SEPARATOR, 'v', 'a', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 };
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static char *memoized_tmpdir;
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/*
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@deftypefn Replacement char* choose_tmpdir ()
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Returns a pointer to a directory path suitable for creating temporary
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files in.
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@end deftypefn
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*/
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char *
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choose_tmpdir (void)
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{
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const char *base = 0;
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char *tmpdir;
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unsigned int len;
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if (memoized_tmpdir)
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return memoized_tmpdir;
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base = try_dir (getenv ("TMPDIR"), base);
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base = try_dir (getenv ("TMP"), base);
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base = try_dir (getenv ("TEMP"), base);
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#ifdef P_tmpdir
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base = try_dir (P_tmpdir, base);
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#endif
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/* Try /tmp, /var/tmp, then /usr/tmp. */
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base = try_dir (tmp, base);
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base = try_dir (vartmp, base);
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base = try_dir (usrtmp, base);
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/* If all else fails, use the current directory! */
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if (base == 0)
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base = ".";
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/* Append DIR_SEPARATOR to the directory we've chosen
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and return it. */
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len = strlen (base);
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tmpdir = XNEWVEC (char, len + 2);
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strcpy (tmpdir, base);
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tmpdir[len] = DIR_SEPARATOR;
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tmpdir[len+1] = '\0';
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memoized_tmpdir = tmpdir;
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return tmpdir;
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}
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/*
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@deftypefn Replacement char* make_temp_file (const char *@var{suffix})
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Return a temporary file name (as a string) or @code{NULL} if unable to
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create one. @var{suffix} is a suffix to append to the file name. The
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string is @code{malloc}ed, and the temporary file has been created.
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@end deftypefn
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*/
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char *
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make_temp_file (const char *suffix)
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{
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const char *base = choose_tmpdir ();
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char *temp_filename;
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int base_len, suffix_len;
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int fd;
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if (suffix == 0)
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suffix = "";
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base_len = strlen (base);
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suffix_len = strlen (suffix);
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temp_filename = XNEWVEC (char, base_len
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+ TEMP_FILE_LEN
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+ suffix_len + 1);
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strcpy (temp_filename, base);
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strcpy (temp_filename + base_len, TEMP_FILE);
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strcpy (temp_filename + base_len + TEMP_FILE_LEN, suffix);
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fd = mkstemps (temp_filename, suffix_len);
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/* If mkstemps failed, then something bad is happening. Maybe we should
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issue a message about a possible security attack in progress? */
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if (fd == -1)
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abort ();
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/* Similarly if we can not close the file. */
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if (close (fd))
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abort ();
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return temp_filename;
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}
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