merge from gcc

[pf3gnuchains/pf3gnuchains4x.git] / libiberty / make-relative-prefix.c

diff --git a/libiberty/make-relative-prefix.c b/libiberty/make-relative-prefix.c
index 4553a71..7239e7b 100644 (file)
--- a/libiberty/make-relative-prefix.c
+++ b/libiberty/make-relative-prefix.c
@@ -1,6 +1,6 @@
 /* Relative (relocatable) prefix support.
    Copyright (C) 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
-   1999, 2000, 2001, 2002, 2006 Free Software Foundation, Inc.
+   1999, 2000, 2001, 2002, 2006, 2012 Free Software Foundation, Inc.
 
 This file is part of libiberty.
 
@@ -58,6 +58,9 @@ relative prefix can be found, return @code{NULL}.
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
+#ifdef HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
 
 #include <string.h>
 
@@ -248,7 +251,11 @@ make_relative_prefix_1 (const char *progname, const char *bin_prefix,
          if (prefixlen < 2)
            prefixlen = 2;
 
-         nstore = (char *) alloca (prefixlen + strlen (progname) + 1);
+         nstore = (char *) alloca (prefixlen + strlen (progname) + 1
+#ifdef HAVE_HOST_EXECUTABLE_SUFFIX
+                                   + strlen (HOST_EXECUTABLE_SUFFIX)
+#endif
+                                   );
 
          startp = endp = temp;
          while (1)
@@ -263,7 +270,7 @@ make_relative_prefix_1 (const char *progname, const char *bin_prefix,
                    }
                  else
                    {
-                     strncpy (nstore, startp, endp - startp);
+                     memcpy (nstore, startp, endp - startp);
                      if (! IS_DIR_SEPARATOR (endp[-1]))
                        {
                          nstore[endp - startp] = DIR_SEPARATOR;
@@ -279,8 +286,14 @@ make_relative_prefix_1 (const char *progname, const char *bin_prefix,
 #endif
                      )
                    {
-                     progname = nstore;
-                     break;
+#if defined (HAVE_SYS_STAT_H) && defined (S_ISREG)
+                     struct stat st;
+                     if (stat (nstore, &st) >= 0 && S_ISREG (st.st_mode))
+#endif
+                       {
+                         progname = nstore;
+                         break;
+                       }
                    }
 
                  if (*endp == 0)