compat: Added memrchr implementation

src/compat/memrchr.c

@@ -0,0 +1,21 @@
+/* memrchr.c
+ *
+ *   memrchr implementation for systems without it
+ *
+ *   Copyright (C) 2010   Henrik Hautakoski <henrik@fiktivkod.org>
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ */
+
+#include "string.h"
+
+void* memrchr(const void *s, int c, size_t n) {
+
+    for(s += n++; n; n--)
+        if (*((char*)s--) == c)
+            return (void*) s + 1;
+    return NULL;
+}

src/compat/string.h

@@ -0,0 +1,6 @@
+
+#include <string.h>
+
+#ifdef NO_MEMRCHR
+extern void* memrchr(const void *, int, size_t);
+#endif