Revert "poll-win32"

[gnulib.git] / lib / relocatable.c

diff --git a/lib/relocatable.c b/lib/relocatable.c
index 5e1dde6..09ff8c9 100644 (file)
--- a/lib/relocatable.c
+++ b/lib/relocatable.c
@@ -1,5 +1,5 @@
 /* Provide relocatable packages.
-   Copyright (C) 2003-2006 Free Software Foundation, Inc.
+   Copyright (C) 2003-2006, 2008 Free Software Foundation, Inc.
    Written by Bruno Haible <bruno@clisp.org>, 2003.
 
    This program is free software; you can redistribute it and/or modify it
@@ -160,17 +160,18 @@ set_relocation_prefix (const char *orig_prefix_arg, const char *curr_prefix_arg)
 /* Convenience function:
    Computes the current installation prefix, based on the original
    installation prefix, the original installation directory of a particular
-   file, and the current pathname of this file.  Returns NULL upon failure.  */
+   file, and the current pathname of this file.
+   Returns it, freshly allocated.  Returns NULL upon failure.  */
 #ifdef IN_LIBRARY
 #define compute_curr_prefix local_compute_curr_prefix
 static
 #endif
-const char *
+char *
 compute_curr_prefix (const char *orig_installprefix,
                     const char *orig_installdir,
                     const char *curr_pathname)
 {
-  const char *curr_installdir;
+  char *curr_installdir;
   const char *rel_installdir;
 
   if (curr_pathname == NULL)
@@ -254,8 +255,11 @@ compute_curr_prefix (const char *orig_installprefix,
       }
 
     if (rp > rel_installdir)
-      /* Unexpected: The curr_installdir does not end with rel_installdir.  */
-      return NULL;
+      {
+       /* Unexpected: The curr_installdir does not end with rel_installdir.  */
+       free (curr_installdir);
+       return NULL;
+      }
 
     {
       size_t curr_prefix_len = cp - curr_installdir;
@@ -264,11 +268,16 @@ compute_curr_prefix (const char *orig_installprefix,
       curr_prefix = (char *) xmalloc (curr_prefix_len + 1);
 #ifdef NO_XMALLOC
       if (curr_prefix == NULL)
-       return NULL;
+       {
+         free (curr_installdir);
+         return NULL;
+       }
 #endif
       memcpy (curr_prefix, curr_installdir, curr_prefix_len);
       curr_prefix[curr_prefix_len] = '\0';
 
+      free (curr_installdir);
+
       return curr_prefix;
     }
   }
@@ -400,7 +409,9 @@ get_shared_library_fullname ()
 #endif /* PIC */
 
 /* Returns the pathname, relocated according to the current installation
-   directory.  */
+   directory.
+   The returned string is either PATHNAME unmodified or a freshly allocated
+   string that you can free with free() after casting it to 'char *'.  */
 const char *
 relocate (const char *pathname)
 {
@@ -420,15 +431,19 @@ relocate (const char *pathname)
         orig_prefix.  */
       const char *orig_installprefix = INSTALLPREFIX;
       const char *orig_installdir = INSTALLDIR;
-      const char *curr_prefix_better;
+      char *curr_prefix_better;
 
       curr_prefix_better =
        compute_curr_prefix (orig_installprefix, orig_installdir,
                             get_shared_library_fullname ());
-      if (curr_prefix_better == NULL)
-       curr_prefix_better = curr_prefix;
 
-      set_relocation_prefix (orig_installprefix, curr_prefix_better);
+      set_relocation_prefix (orig_installprefix,
+                            curr_prefix_better != NULL
+                            ? curr_prefix_better
+                            : curr_prefix);
+
+      if (curr_prefix_better != NULL)
+       free (curr_prefix_better);
 
       initialized = 1;
     }
@@ -442,9 +457,19 @@ relocate (const char *pathname)
       && strncmp (pathname, orig_prefix, orig_prefix_len) == 0)
     {
       if (pathname[orig_prefix_len] == '\0')
-       /* pathname equals orig_prefix.  */
-       return curr_prefix;
-      if (ISSLASH (pathname[orig_prefix_len]))
+       {
+         /* pathname equals orig_prefix.  */
+         char *result = (char *) xmalloc (strlen (curr_prefix) + 1);
+
+#ifdef NO_XMALLOC
+         if (result != NULL)
+#endif
+           {
+             strcpy (result, curr_prefix);
+             return result;
+           }
+       }
+      else if (ISSLASH (pathname[orig_prefix_len]))
        {
          /* pathname starts with orig_prefix.  */
          const char *pathname_tail = &pathname[orig_prefix_len];