Add strtok_r stub for MinGW

Author: Levak

src/tools/geoip.c

@@ -27,6 +27,39 @@
 
 #ifdef __MINGW32__
 # include <Winsock.h>
+/* 
+ * public domain strtok_r() by Charlie Gordon
+ *
+ *   from comp.lang.c  9/14/2007
+ *
+ *      http://groups.google.com/group/comp.lang.c/msg/2ab1ecbb86646684
+ *
+ *     (Declaration that it's public domain):
+ *      http://groups.google.com/group/comp.lang.c/msg/7c7b39328fefab9c
+ */
+ 
+char* strtok_r(char *str, const char *delim, char **nextp)
+{
+    char *ret;
+
+    if (str == NULL)
+        str = *nextp;
+
+    str += strspn(str, delim);
+
+    if (*str == '\0')
+        return NULL;
+
+    ret = str;
+    str += strcspn(str, delim);
+
+    if (*str)
+        *str++ = '\0';
+
+    *nextp = str;
+
+    return ret;
+}
 #else
 # include <sys/socket.h>
 # include <netinet/in.h>