From 320f600cd980230b2b2e34c7256c9564af6afae9 Mon Sep 17 00:00:00 2001
From: David Härdeman <david@hardeman.nu>
Date: Wed, 10 Jun 2020 19:01:39 +0200
Subject: Add some basic memory tracking infrastructure while hacking

---
 utils.c | 95 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)

(limited to 'utils.c')

diff --git a/utils.c b/utils.c
index 87ed0fe..b9a4bed 100644
--- a/utils.c
+++ b/utils.c
@@ -3,10 +3,105 @@
 #include <stdint.h>
 #include <limits.h>
 #include <arpa/inet.h>
+#include <string.h>
 
 #include "main.h"
 #include "utils.h"
 
+static unsigned total_malloc_count = 0;
+static int malloc_count = 0;
+
+LIST_HEAD(malloc_list);
+
+struct allocation {
+	void *caller;
+	void *ptr;
+	size_t size;
+	struct list_head list;
+};
+
+static void
+__add_allocation(void *caller, void *ptr, size_t size)
+{
+	struct allocation *a = malloc(sizeof(*a));
+
+	a->caller = caller;
+	a->ptr = ptr;
+	a->size = size;
+	list_add(&a->list, &malloc_list);
+}
+
+#define add_allocation(p, s) __add_allocation(__builtin_extract_return_addr(__builtin_return_address(0)), p, s)
+
+void *
+__zmalloc(size_t size)
+{
+	void *ptr;
+
+	fprintf(stderr, "zmalloc: Allocation size %zi\n", size);
+	ptr = calloc(1, size);
+	if (ptr) {
+		add_allocation(ptr, size);
+		total_malloc_count++;
+		malloc_count++;
+	}
+	return ptr;
+}
+
+char *
+__xstrdup(const char *s)
+{
+	char *r;
+
+	fprintf(stderr, "xstrdup: Allocation size %zi\n", strlen(s) + 1);
+	r = strdup(s);
+	if (r) {
+		add_allocation(r, strlen(s) + 1);
+		total_malloc_count++;
+		malloc_count++;
+	}
+	return r;
+}
+
+void
+xfree(void *ptr)
+{
+	struct allocation *a, *tmp;
+	unsigned delete_count = 0;
+
+	if (!ptr)
+		return;
+	free(ptr);
+	malloc_count--;
+
+	list_for_each_entry_safe(a, tmp, &malloc_list, list) {
+		if (a->ptr == ptr) {
+			list_del(&a->list);
+			free(a);
+			delete_count++;
+		}
+	}
+
+	if (delete_count != 1) {
+		error("Delete count is %u for ptr 0x%p\n", delete_count, ptr);
+		exit(EXIT_FAILURE);
+	}
+}
+
+void
+debug_resource_usage()
+{
+	struct allocation *a;
+
+	fprintf(stderr, "Still malloced %i (total %u)\n",
+		malloc_count, total_malloc_count);
+
+	list_for_each_entry(a, &malloc_list, list) {
+		fprintf(stderr, "* Allocation - caller: 0x%p, ptr: 0x%p, size %zu\n",
+			a->caller, a->ptr, a->size);
+	}
+}
+
 uint16_t sockaddr_port(struct sockaddr_in46 *addr)
 {
 	switch (addr->storage.ss_family) {
-- 
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