merge from gcc

1 files changed, 160 insertions, 0 deletions

diff --git a/libiberty/make-temp-file.c b/libiberty/make-temp-file.c
new file mode 100644
index 00000000000..67efed16a58
--- /dev/null
+++ b/libiberty/make-temp-file.c
@@ -0,0 +1,160 @@
+/* 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;
+}