1 files changed, 39 insertions, 0 deletions
diff --git a/source/luametatex/source/luacore/luasocket/src/compat.c b/source/luametatex/source/luacore/luasocket/src/compat.c
new file mode 100644
index 000000000..34ffdaf71
--- /dev/null
+++ b/source/luametatex/source/luacore/luasocket/src/compat.c
@@ -0,0 +1,39 @@
+#include "luasocket.h"
+#include "compat.h"
+
+#if LUA_VERSION_NUM==501
+
+/*
+** Adapted from Lua 5.2
+*/
+void luasocket_setfuncs (lua_State *L, const luaL_Reg *l, int nup) {
+  luaL_checkstack(L, nup+1, "too many upvalues");
+  for (; l->name != NULL; l++) {  /* fill the table with given functions */
+    int i;
+    lua_pushstring(L, l->name);
+    for (i = 0; i < nup; i++)  /* copy upvalues to the top */
+      lua_pushvalue(L, -(nup+1));
+    lua_pushcclosure(L, l->func, nup);  /* closure with those upvalues */
+    lua_settable(L, -(nup + 3));
+  }
+  lua_pop(L, nup);  /* remove upvalues */
+}
+
+/*
+** Duplicated from Lua 5.2
+*/
+void *luasocket_testudata (lua_State *L, int ud, const char *tname) {
+  void *p = lua_touserdata(L, ud);
+  if (p != NULL) {  /* value is a userdata? */
+    if (lua_getmetatable(L, ud)) {  /* does it have a metatable? */
+      luaL_getmetatable(L, tname);  /* get correct metatable */
+      if (!lua_rawequal(L, -1, -2))  /* not the same? */
+        p = NULL;  /* value is a userdata with wrong metatable */
+      lua_pop(L, 2);  /* remove both metatables */
+      return p;
+    }
+  }
+  return NULL;  /* value is not a userdata with a metatable */
+}
+
+#endif