Added HandlerSocket plugin

- Fixed compiler errors
- Modified Makefiles to be part of plugin directory
- Some minor changes in database.cpp to use the new MariaDB handler interface

plugin/handler_socket/libhsclient/escape.hpp

@@ -0,0 +1,65 @@
+
+// vim:sw=2:ai
+
+/*
+ * Copyright (C) 2010 DeNA Co.,Ltd.. All rights reserved.
+ * See COPYRIGHT.txt for details.
+ */
+
+#include <stdint.h>
+
+#include "string_buffer.hpp"
+#include "string_ref.hpp"
+#include "string_util.hpp"
+
+#ifndef DENA_ESCAPE_HPP
+#define DENA_ESCAPE_HPP
+
+namespace dena {
+
+void escape_string(char *& wp, const char *start, const char *finish);
+void escape_string(string_buffer& ar, const char *start, const char *finish);
+bool unescape_string(char *& wp, const char *start, const char *finish);
+  /* unescaped_string() works even if wp == start */
+bool unescape_string(string_buffer& ar, const char *start, const char *finish);
+
+uint32_t read_ui32(char *& start, char *finish);
+void write_ui32(string_buffer& buf, uint32_t v);
+
+inline bool
+is_null_expression(const char *start, const char *finish)
+{
+  return (finish == start + 1 && start[0] == 0);
+}
+
+inline void
+read_token(char *& start, char *finish)
+{
+  char *const p = memchr_char(start, '\t', finish - start);
+  if (p == 0) {
+    start = finish;
+  } else {
+    start = p;
+  }
+}
+
+inline void
+skip_token_delim_fold(char *& start, char *finish)
+{
+  while (start != finish && start[0] == '\t') {
+    ++start;
+  }
+}
+
+inline void
+skip_one(char *& start, char *finish)
+{
+  if (start != finish) {
+    ++start;
+  }
+}
+
+};
+
+#endif
+