Start work on cqueue implementation, create cleanup set of functions

1 files changed, 32 insertions, 0 deletions

diff --git a/src/shared.h b/src/shared.h
index b7fe7c3..1a629e6 100644
--- a/src/shared.h
+++ b/src/shared.h
@@ -50,4 +50,36 @@ int wwbuf(int fd, const unsigned char *buf, int len);
 // `dirname()` reimplementation that returns a malloc()'ed string. According to the `x___` naming scheme, exits/aborts on alloc error.
 char * xdirname(const char * const path);
 
+
+
+// Cleanup callback. Should act like `free()`, in that it doesn't crash if the pointer it's given is null
+typedef void (*cleanup_callback)(void*);
+
+// Cleanup struct. Stores a STATICALLY defined array of callbacks and void* arguments
+typedef struct cl {
+        cleanup_callback *funcs;
+        void **args;
+
+        int size;
+        int used;
+} cleanup;
+
+int cleanup_init(cleanup * const loc, int size, cleanup_callback funcs[], void *args[]);
+int cleanup_register(cleanup * const loc, cleanup_callback cb, void *arg);
+int cleanup_cndregister(cleanup * const loc, unsigned char flag, cleanup_callback cb, void *arg);
+int cleanup_clear(cleanup * const loc);
+cleanup_callback cleanup_peekf(cleanup * const loc);
+cleanup_callback cleanup_popf(cleanup * const loc);
+void * cleanup_peeka(cleanup * const loc);
+void * cleanup_popa(cleanup * const loc);
+int cleanup_fire(cleanup * const loc);
+
+/* Cleanup environment creator. Automatically defines the variables `__CLEANUP`, `__CLEANUP_FUNCS`, and `__CLEANUP_ARGS` and initializes
+// via `cleanup_init()` using these variables. */ 
+#define cleanup_create(size) \
+cleanup __CLEANUP; \
+cleanup_callback __CLEANUP_FUNCS[(size)]; \
+void *__CLEANUP_ARGS[(size)]; \
+cleanup_init(&__CLEANUP, (size), __CLEANUP_FUNCS, __CLEANUP_ARGS)
+
 #endif
\ No newline at end of file