1 files changed, 64 insertions, 0 deletions
diff --git a/comm/chat/modules/CLib.sys.mjs b/comm/chat/modules/CLib.sys.mjs
new file mode 100644
index 0000000000..35226b565b
--- /dev/null
+++ b/comm/chat/modules/CLib.sys.mjs
@@ -0,0 +1,64 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import { ctypes } from "resource://gre/modules/ctypes.sys.mjs";
+
+var OS = Services.appinfo.OS.toLowerCase();
+
+// type defs
+
+var FILE = ctypes.StructType("FILE");
+var fname_t = ctypes.char.ptr;
+var wchar_t = ctypes.char16_t;
+
+// Set the abi and path to CLib based on the OS.
+var libcAbi, libcPath;
+var strdup = "strdup";
+var fopen = "fopen";
+
+switch (OS) {
+  case "win32":
+  case "winnt":
+    libcAbi = ctypes.winapi_abi;
+    libcPath = ctypes.libraryName("msvcrt");
+    strdup = "_strdup";
+    fopen = "_wfopen";
+    fname_t = wchar_t.ptr;
+    break;
+  case "darwin":
+  case "dragonfly":
+  case "netbsd":
+  case "openbsd":
+    libcAbi = ctypes.default_abi;
+    libcPath = ctypes.libraryName("c");
+    break;
+  case "freebsd":
+    libcAbi = ctypes.default_abi;
+    libcPath = "libc.so.7";
+    break;
+  case "linux":
+    libcAbi = ctypes.default_abi;
+    libcPath = "libc.so.6";
+    break;
+  default:
+    throw new Error("Unknown OS");
+}
+
+var libc = ctypes.open(libcPath);
+
+export var CLib = {
+  FILE,
+  memcmp: libc.declare(
+    "memcmp",
+    libcAbi,
+    ctypes.int,
+    ctypes.void_t.ptr,
+    ctypes.void_t.ptr,
+    ctypes.size_t
+  ),
+  free: libc.declare("free", libcAbi, ctypes.void_t, ctypes.void_t.ptr),
+  strdup: libc.declare(strdup, libcAbi, ctypes.char.ptr, ctypes.char.ptr),
+  fclose: libc.declare("fclose", libcAbi, ctypes.int, FILE.ptr),
+  fopen: libc.declare(fopen, libcAbi, FILE.ptr, fname_t, fname_t),
+};