Dmitriy Sergeyev provided a patch that made the SOCKS[45] code work better as

it now will read the full data sent from servers. The SOCKS-related code was
also moved to the new lib/socks.c source file.

lib/socks.h

@@ -0,0 +1,19 @@
+#ifndef __SOCKS_H
+#define __SOCKS_H
+
+/*
+ * This function logs in to a SOCKS4 proxy and sends the specifics to the
+ * final destination server.
+ */
+CURLcode Curl_SOCKS4(const char *proxy_name,
+                     struct connectdata *conn);
+
+/*
+ * This function logs in to a SOCKS5 proxy and sends the specifics to the
+ * final destination server.
+ */
+CURLcode Curl_SOCKS5(const char *proxy_name,
+                     const char *proxy_password,
+                     struct connectdata *conn);
+
+#endif