From 6e1533c9439283c70ead0d72fb6ed2d9fe6954df Mon Sep 17 00:00:00 2001
From: Mineplay <tristanfranssen@strawhats.nl>
Date: Sat, 19 Apr 2025 06:49:34 -0500
Subject: [PATCH] feat(allocator): implemented realloc function

---
 Include/Hallocy/Core/Allocator.h |  1 +
 Src/Core/Allocator.c             | 22 ++++++++++++++++++++++
 Tests/Main.c                     |  7 +++++++
 3 files changed, 30 insertions(+)

diff --git a/Include/Hallocy/Core/Allocator.h b/Include/Hallocy/Core/Allocator.h
index e3ab9c0..85c0111 100644
--- a/Include/Hallocy/Core/Allocator.h
+++ b/Include/Hallocy/Core/Allocator.h
@@ -32,6 +32,7 @@ void *hallocy_allocate(size_t size, bool zero_memory);
 
 static inline void *hallocy_malloc(size_t size) { return hallocy_allocate(size, false); }
 static inline void *hallocy_calloc(size_t size, size_t count) { return  hallocy_allocate(size * count, true); }
+void *hallocy_realloc(void *memory_pointer, size_t size);
 HallocyError hallocy_free(void *pointer);
 
 #endif
\ No newline at end of file
diff --git a/Src/Core/Allocator.c b/Src/Core/Allocator.c
index 42b88b4..96ee44f 100644
--- a/Src/Core/Allocator.c
+++ b/Src/Core/Allocator.c
@@ -229,6 +229,28 @@ void *hallocy_allocate(size_t size, bool zero_memory) {
     return (void*)(memory_pointer + 1);
 }
 
+void *hallocy_realloc(void *memory_pointer, size_t size) {
+    if (memory_pointer == NULL) {
+        return hallocy_allocate(size, false);
+    }
+
+    if (size == 0) {
+        hallocy_free(memory_pointer);
+        return NULL;
+    }
+
+    HallocyMemoryHeader *memory_header = ((HallocyMemoryHeader*)memory_pointer) - 1;
+    if (memory_header->size - sizeof(HallocyMemoryHeader) >= size) {
+        return memory_pointer;
+    }
+
+    void *new_memory = hallocy_allocate(size, false);
+    hallocy_copy_memory(new_memory, memory_pointer, memory_header->size);
+    hallocy_free(memory_pointer);
+    
+    return new_memory;
+}
+
 HallocyError hallocy_free(void *pointer) {
     if (pointer == NULL) {
         return HALLOCY_ERROR_INVALID_POINTER;
diff --git a/Tests/Main.c b/Tests/Main.c
index 934c082..65bb50b 100644
--- a/Tests/Main.c
+++ b/Tests/Main.c
@@ -70,6 +70,13 @@
         printf("text_copy_copy and text_copy are equal\n");
      }
 
+     text_copy_copy = (char*)hallocy_realloc(text_copy_copy, 40);
+     
+     hallocy_set_memory(text_copy_copy + 35, 'q', 4);
+     text_copy_copy[39] = '\0';
+
+     printf("%s\n", text_copy_copy);
+
      hallocy_free(text_copy_copy);
      hallocy_free(text_copy);
      hallocy_free(text);