feature: fork() (to be tested)

src/memory/user/vrealloc.c

@@ -0,0 +1,37 @@
+#include "alloc.h"
+#include "string.h"
+#include <stdint.h>
+
+// Prototype for kfree and umalloc
+void kfree(void *ptr);
+void *umalloc(uint32_t size);
+
+/*
+ * ptr: block to resize (undefined behavior if invalid)
+ * size: size needed by the user to get vreallocated
+ *
+ * If we have a size <= to the previous size, we don't have
+ * to do anything, we just change sub_size for info purposes
+ * and return the same pointer
+ * Else, we allocate a new block and copy the content of
+ * the previous block in the new one and kfree the old block
+ *
+ * ptr: returns the aligned pointer of the vreallocated block
+ */
+void *vrealloc(void *ptr, uint32_t size)
+{
+	void *new_ptr = NULL;
+	if (ptr == NULL)
+		return NULL;
+	Block *block = (Block *)((uint32_t)ptr - sizeof(Block));
+	if (block->size >= size) {
+		block->sub_size = size;
+		return (ptr);
+	}
+	new_ptr = umalloc(size);
+	if (new_ptr == NULL)
+		return NULL;
+	memmove(new_ptr, ptr, block->size);
+	ufree(ptr);
+	return (new_ptr);
+}