1 files changed, 178 insertions, 0 deletions
diff --git a/src/compat52.h b/src/compat52.h
new file mode 100644
index 0000000..9b0a48e
--- /dev/null
+++ b/src/compat52.h
@@ -0,0 +1,178 @@
+/* ==========================================================================
+ * compat52.h - Routines for Lua 5.2 compatibility
+ * --------------------------------------------------------------------------
+ * Copyright (c) 2012  William Ahern
+ *
+ * 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.
+ * ==========================================================================
+ */
+
+
+#if LUA_VERSION_NUM < 503
+
+#define lua_getfield(L, i, f) (lua_getfield(L, (i), (f)), lua_type(L, -1))
+
+static int lua_isinteger(lua_State *L, int index) {
+  if (lua_type(L, index) == LUA_TNUMBER) {
+    lua_Number n = lua_tonumber(L, index);
+    lua_Integer i = lua_tointeger(L, index);
+    if (i == n)
+      return 1;
+  }
+  return 0;
+}
+
+#endif
+
+#if LUA_VERSION_NUM < 502
+
+#define LUA_OK 0
+
+
+static void luaL_setmetatable(lua_State *L, const char *tname) {
+	luaL_getmetatable(L, tname);
+	lua_setmetatable(L, -2);
+} /* luaL_setmetatable() */
+
+
+static int lua_absindex(lua_State *L, int idx) {
+	return (idx > 0 || idx <= LUA_REGISTRYINDEX)? idx : lua_gettop(L) + idx + 1;
+} /* lua_absindex() */
+
+
+static void *luaL_testudata(lua_State *L, int arg, const char *tname) {
+	void *p = lua_touserdata(L, arg);
+	int eq;
+
+	if (!p || !lua_getmetatable(L, arg))
+		return 0;
+
+	luaL_getmetatable(L, tname);
+	eq = lua_rawequal(L, -2, -1);
+	lua_pop(L, 2);
+
+	return (eq)? p : 0;
+} /* luaL_testudate() */
+
+
+static void luaL_setfuncs(lua_State *L, const luaL_Reg *l, int nup) {
+	int i, t = lua_absindex(L, -1 - nup);
+
+	for (; l->name; l++) {
+		for (i = 0; i < nup; i++)
+			lua_pushvalue(L, -nup);
+		lua_pushcclosure(L, l->func, nup);
+		lua_setfield(L, t, l->name);
+	}
+
+	lua_pop(L, nup);
+} /* luaL_setfuncs() */
+
+
+#define luaL_newlibtable(L, l) \
+	lua_createtable(L, 0, (sizeof (l) / sizeof *(l)) - 1)
+
+#define luaL_newlib(L, l) \
+	(luaL_newlibtable((L), (l)), luaL_setfuncs((L), (l), 0))
+
+
+static void luaL_requiref(lua_State *L, const char *modname, lua_CFunction openf, int glb) {
+	lua_pushcfunction(L, openf);
+	lua_pushstring(L, modname);
+	lua_call(L, 1, 1);
+
+	lua_getglobal(L, "package");
+	lua_getfield(L, -1, "loaded");
+	lua_pushvalue(L, -3);
+	lua_setfield(L, -2, modname);
+
+	lua_pop(L, 2);
+
+	if (glb) {
+		lua_pushvalue(L, -1);
+		lua_setglobal(L, modname);
+	}
+} /* luaL_requiref() */
+
+
+#define lua_resume(L, from, nargs) lua_resume((L), (nargs))
+
+
+static void lua_rawgetp(lua_State *L, int index, const void *p) {
+	index = lua_absindex(L, index);
+	lua_pushlightuserdata(L, (void *)p);
+	lua_rawget(L, index);
+} /* lua_rawgetp() */
+
+static void lua_rawsetp(lua_State *L, int index, const void *p) {
+	index = lua_absindex(L, index);
+	lua_pushlightuserdata(L, (void *)p);
+	lua_pushvalue(L, -2);
+	lua_rawset(L, index);
+	lua_pop(L, 1);
+} /* lua_rawsetp() */
+
+
+#ifndef LUA_UNSIGNED
+#define LUA_UNSIGNED unsigned
+#endif
+
+typedef LUA_UNSIGNED lua_Unsigned;
+
+
+static void lua_pushunsigned(lua_State *L, lua_Unsigned n) {
+	lua_pushnumber(L, (lua_Number)n);
+} /* lua_pushunsigned() */
+
+static lua_Unsigned luaL_checkunsigned(lua_State *L, int arg) {
+	return (lua_Unsigned)luaL_checknumber(L, arg);
+} /* luaL_checkunsigned() */
+
+
+static lua_Unsigned luaL_optunsigned(lua_State *L, int arg, lua_Unsigned def) {
+	return (lua_Unsigned)luaL_optnumber(L, arg, (lua_Number)def);
+} /* luaL_optunsigned() */
+
+
+#ifndef LUA_FILEHANDLE /* Not defined by earlier LuaJIT releases */
+#define LUA_FILEHANDLE "FILE*"
+#endif
+
+/*
+ * Lua 5.1 userdata is a simple FILE *, while LuaJIT is a struct with the
+ * first member a FILE *, similar to Lua 5.2.
+ */
+typedef struct luaL_Stream {
+	FILE *f;
+} luaL_Stream;
+
+
+#define lua_rawlen(...) lua_objlen(__VA_ARGS__)
+
+
+#define lua_pushstring(...) lua52_pushstring(__VA_ARGS__)
+
+static const char *lua52_pushstring(lua_State *L, const char *s) {
+	(lua_pushstring)(L, s);
+	return lua_tostring(L, -1);
+} /* lua52_pushstring() */
+
+
+#endif /* LUA_VERSION_NUM < 502 */