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authorDJ Delorie <dj@delorie.com>2001-03-21 20:12:30 +0000
committerDJ Delorie <dj@delorie.com>2001-03-21 20:12:30 +0000
commit313b5f131f05e7b86ae5c99311fed0a0b7771f61 (patch)
tree6c666700e4ad3a9c0b1e952bd2dd789d476cacea /libiberty/make-temp-file.c
parentf58a596adbb9556a2e241083d51ca40f7b598d5f (diff)
downloadgdb-313b5f131f05e7b86ae5c99311fed0a0b7771f61.tar.gz
merge from gcc
Diffstat (limited to 'libiberty/make-temp-file.c')
-rw-r--r--libiberty/make-temp-file.c160
1 files changed, 160 insertions, 0 deletions
diff --git a/libiberty/make-temp-file.c b/libiberty/make-temp-file.c
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+/* 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., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, 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
+
+#ifndef R_OK
+#define R_OK 4
+#define W_OK 2
+#define X_OK 1
+#endif
+
+#include "libiberty.h"
+extern int mkstemps PARAMS ((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 const char *try PARAMS ((const char *, const char *));
+
+static const char *
+try (dir, base)
+ const char *dir, *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;
+
+char *
+choose_tmpdir ()
+{
+ const char *base = 0;
+ char *tmpdir;
+ unsigned int len;
+
+ if (memoized_tmpdir)
+ return memoized_tmpdir;
+
+ 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 /var/tmp, /usr/tmp, then /tmp. */
+ base = try (vartmp, base);
+ base = try (usrtmp, base);
+ base = try (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 = xmalloc (len + 2);
+ strcpy (tmpdir, base);
+ tmpdir[len] = DIR_SEPARATOR;
+ tmpdir[len+1] = '\0';
+
+ memoized_tmpdir = tmpdir;
+ return tmpdir;
+}
+
+/* Return a temporary file name (as a string) or NULL if unable to create
+ one. SUFFIX is a suffix to append to the file name. The string is
+ malloced, and the temporary file has been created. */
+
+char *
+make_temp_file (suffix)
+ 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 = xmalloc (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);
+ /* 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;
+}