From 67582c8e1dedd808ac2fecc13728fc4edff96b5e Mon Sep 17 00:00:00 2001
From: Maschell <Maschell@gmx.de>
Date: Fri, 29 May 2020 17:37:01 +0200
Subject: [PATCH] Add initial support for hooks

---
 include/wums.h       |  1 +
 include/wums/hooks.h | 58 ++++++++++++++++++++++++++++++++++++++++++++
 share/wums.ld        |  6 +++++
 3 files changed, 65 insertions(+)
 create mode 100644 include/wums/hooks.h

diff --git a/include/wums.h b/include/wums.h
index 9a71c8e..7a26dc5 100644
--- a/include/wums.h
+++ b/include/wums.h
@@ -3,5 +3,6 @@
 
 #include "wums/common.h"
 #include "wums/exports.h"
+#include "wums/hooks.h"
 
 #endif /* WUMS_H_ */
\ No newline at end of file
diff --git a/include/wums/hooks.h b/include/wums/hooks.h
new file mode 100644
index 0000000..93296b1
--- /dev/null
+++ b/include/wums/hooks.h
@@ -0,0 +1,58 @@
+/* based on blsug.h
+ *   by Alex Chadwick
+ *
+ * Copyright (C) 2014, Alex Chadwick
+ * Modified by Maschell, 2018-2020
+ *
+ * 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.
+ */
+
+#pragma once
+
+#include "common.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define WUMS_HOOK_EX(type_def,original_func) \
+    extern const wums_hook_t wums_hooks_ ## original_func WUMS_SECTION("hooks"); \
+    const wums_hook_t wums_hooks_ ## original_func = { \
+        .type = type_def, \
+        .target = (const void*)&(original_func) \
+    }
+
+typedef enum wums_hook_type_t {
+    WUMS_HOOK_INIT,                   /* Called when exiting the plugin loader */
+} wums_hook_type_t;
+
+typedef struct wums_hook_t {
+    wums_hook_type_t type;       /*  Defines the type of the hook */
+    const void *target;                 /*  Address of our own, new function */
+} wums_hook_t;
+
+
+#define WUMS_INITIALIZE() \
+    void init_module(void);\
+    WUMS_HOOK_EX(WUMS_HOOK_INIT,init_module); \
+    void init_module()
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/share/wums.ld b/share/wums.ld
index e42c42f..f1be264 100644
--- a/share/wums.ld
+++ b/share/wums.ld
@@ -456,10 +456,16 @@ SECTIONS
 	  *(.wums.meta*)
       KEEP(*(.wums.meta*))
    } > datamem
+   
    .wums.exports : {
 	  *(.wums.exports*)
       KEEP(*(.wums.exports*))
    } > datamem
+   
+   .wums.hooks : {
+	  *(.wums.hooks*)
+      KEEP(*(.wums.hooks*))
+   } > datamem
     
    /DISCARD/ : {
       *(.abs)