1 files changed, 147 insertions, 0 deletions
diff --git a/libiberty/choose-temp.c b/libiberty/choose-temp.c
new file mode 100644
index 00000000000..798de4822a5
--- /dev/null
+++ b/libiberty/choose-temp.c
@@ -0,0 +1,147 @@
+/* Utility to pick a temporary filename prefix.
+   Copyright (C) 1996 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.  */
+
+#ifndef 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 "config.h"
+#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 prefered 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, returh 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)
+#ifdef VMS
+    base = "[";
+#else
+    base = ".";
+#endif
+
+#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;
+}