`gamealloc.c` (#33)

* C file

* match file

* review

1 files changed, 60 insertions, 0 deletions

diff --git a/src/code/gamealloc.c b/src/code/gamealloc.c
new file mode 100644
index 0000000..f953028
--- /dev/null
+++ b/src/code/gamealloc.c
@@ -0,0 +1,60 @@
+#include "gamealloc.h"
+#include "malloc.h"
+#include "libc/stdint.h"
+
+void func_800D3720_jp(GameAlloc* this) {
+    GameAllocEntry* iter = this->base.next;
+
+    while (&this->base != iter) {
+        iter = iter->next;
+    }
+}
+
+void* gamealloc_malloc(GameAlloc* this, size_t size) {
+    GameAllocEntry* ptr = malloc(size + sizeof(GameAllocEntry));
+
+    if (ptr != NULL) {
+        ptr->size = size;
+        ptr->prev = this->head;
+        this->head->next = ptr;
+        this->head = ptr;
+        ptr->next = &this->base;
+        this->base.prev = this->head;
+
+        return ptr + 1;
+    }
+
+    return NULL;
+}
+
+void gamealloc_free(GameAlloc* this, void* ptr) {
+    if (ptr != NULL) {
+        GameAllocEntry* entry = (GameAllocEntry*)ptr - 1;
+
+        entry->prev->next = entry->next;
+        entry->next->prev = entry->prev;
+        this->head = this->base.prev;
+        free(entry);
+    }
+}
+
+void gamealloc_cleanup(GameAlloc* this) {
+    GameAllocEntry* iter = this->base.next;
+
+    while (&this->base != iter) {
+        GameAllocEntry* cur = iter;
+
+        iter = iter->next;
+        free(cur);
+    }
+
+    this->head = &this->base;
+    this->base.next = &this->base;
+    this->base.prev = &this->base;
+}
+
+void gamealloc_init(GameAlloc* this) {
+    this->head = &this->base;
+    this->base.next = &this->base;
+    this->base.prev = &this->base;
+}