fix: MCPCをvendored fork化しMCP準拠と接続安定性を改善

- Git submoduleを廃止してMCPCを直接管理
- Windowsで254リクエスト付近に発生する切断を修正
- JSON-RPC 2.0エラー応答を標準化
- tool schemaとruntimeの必須・任意引数を一致
- 1000回連続呼び出しの回帰テストを追加

1 files changed, 75 insertions, 0 deletions

diff --git a/third_party/mcpc/src/ext_string.h b/third_party/mcpc/src/ext_string.h
new file mode 100644
index 0000000..87cc198
--- /dev/null
+++ b/third_party/mcpc/src/ext_string.h
@@ -0,0 +1,75 @@
+// This file is part of the mcpc library.
+//
+// Copyright (C) 2025 Michael Lee <micl2e2 AT proton.me>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do so,
+// subject to the following conditions: 
+// 
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software. 
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+#ifndef h__string
+#define h__string
+
+#include <string.h>
+#include <stddef.h>
+#include <string.h>
+#include <ctype.h>
+
+#include <mcpc/_c23_keywords.h>
+#include <mcpc/_c23_uchar.h>
+
+#define u8c1(a) u8##"" a
+#define u8c2(a, b) u8##"" a b
+#define u8c3(a, b, c) u8##"" a b c
+#define u8c4(a, b, c, d) u8##"" a b c d
+#define u8c5(a, b, c, d, e) u8##"" a b c d e
+#define u8c6(a, b, c, d, e, f) u8##"" a b c d e f
+#define u8c7(a, b, c, d, e, f, g) u8##"" a b c d e f g
+
+inline static bool
+u8streq(const char8_t* a, const char8_t* b)
+{
+  const char* const aa = (const char* const)a;
+  const char* const bb = (const char* const)b;
+  return strcmp(aa, bb) == 0;
+}
+
+inline static size_t
+u8strlen(const char8_t* u8s)
+{
+  const char* s = (const char*)u8s;
+  return strlen(s);
+}
+
+static inline int
+u8strcmp (const char8_t *s1, const char8_t *s2)
+{
+  return strcmp ((const char *) s1, (const char *) s2);
+}
+
+static inline int
+u8strncmp (const char8_t *s1, const char8_t *s2, size_t n)
+{
+  return strncmp ((const char *) s1, (const char *) s2, n);
+}
+
+static inline bool
+beg_with_alph(const char8_t* const u8s)
+{
+  const char* const s = (const char* const)u8s;
+  return s[0] == '/' || isalpha((int)s[0]);
+}
+
+#endif