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authorRichard Henderson <rth@redhat.com>1999-05-03 07:29:11 +0000
committerRichard Henderson <rth@redhat.com>1999-05-03 07:29:11 +0000
commit252b5132c753830d5fd56823373aed85f2a0db63 (patch)
tree1af963bfd8d3e55167b81def4207f175eaff3a56 /libiberty/choose-temp.c
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19990502 sourceware importbinu_ss_19990502
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diff --git a/libiberty/choose-temp.c b/libiberty/choose-temp.c
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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. */
+
+/* This file lives in at least two places: libiberty and gcc.
+ Don't change one without the other. */
+
+#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_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)
+#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)
+ 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;
+}