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allocator/src/me_alloc/realloc.c

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+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   realloc.c                                          :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: maiboyer <maiboyer@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/07/10 16:48:19 by maiboyer          #+#    #+#             */
+/*   Updated: 2024/07/10 17:12:05 by maiboyer         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "aq/allocator.h"
+#include "aq/internal_vg_funcs.h"
+#include "aq/melloc_interal.h"
+#include "me/mem/mem.h"
+#include "me/types.h"
+#include <errno.h>
+
+static void	*_realloc_inner_copy(struct s_allocator_melloc *self, void *ptr, \
+								t_usize size, t_chunk *next)
+{
+	t_chunk	*chk;
+
+	chk = ptr - sizeof(*chk);
+	vg_mem_no_access(next, sizeof(*next));
+	next = m_realloc(self, NULL, size);
+	vg_mem_defined(chk, sizeof(*chk));
+	mem_move(next, ptr, chk->size);
+	vg_mem_no_access(chk, sizeof(*chk));
+	m_free(self, ptr);
+	return (next);
+}
+
+static void	*_realloc_inner(struct s_allocator_melloc *self, void *ptr, \
+				t_usize size)
+{
+	t_usize	old_size;
+	t_chunk	*chk;
+	t_chunk	*next;
+
+	chk = ptr - sizeof(*chk);
+	vg_mem_defined(chk, sizeof(*chk));
+	if (chk->size >= size)
+		return (vg_mem_no_access(chk, sizeof(*chk)), ptr);
+	next = get_next_block(chk, false);
+	(vg_mem_defined(next, sizeof(*next)), vg_mem_defined(chk, sizeof(*chk)));
+	if (next != NULL && !next->used && chk->size + next->size
+		+ sizeof(*next) >= size)
+	{
+		old_size = chk->size;
+		chk->size += next->size + sizeof(*next);
+		return (vg_mem_undefined(next, next->size + sizeof(*next)), \
+	vg_block_resize((void *)chk + sizeof(*chk), old_size, chk->size), \
+	vg_mem_no_access(chk, sizeof(*chk)), ptr);
+	}
+	else
+		return (_realloc_inner_copy(self, ptr, size, next));
+}
+
+static void	*_realloc_alloc(struct s_allocator_melloc *self, t_usize size)
+{
+	t_chunk	*chunk;
+
+	chunk = find_chunk_of_size(self, size);
+	if (chunk == NULL)
+	{
+		if (alloc_new_page(self, size + sizeof(t_chunk) * 2))
+			return (m_alloc_error(self, "Unable to alloc page"));
+		chunk = find_chunk_of_size(self, size);
+		if (chunk == NULL)
+			return (m_alloc_error(self, "Unable to find block"));
+	}
+	vg_mem_defined((void *)chunk, sizeof(*chunk));
+	chunk->used = true;
+	vg_mem_defined((void *)chunk + sizeof(*chunk), chunk->size);
+	mem_set_zero((void *)chunk + sizeof(*chunk), chunk->size);
+	vg_block_malloc((void *)chunk + sizeof(*chunk), chunk->size);
+	vg_mem_no_access((void *)chunk, sizeof(*chunk));
+	return ((void *)chunk + sizeof(*chunk));
+}
+
+void	*m_realloc(struct s_allocator_melloc *self, void *ptr, t_usize size)
+{
+	t_chunk	*chunk;
+	t_chunk	*next;
+
+	if (size > INT32_MAX - sizeof(t_chunk) * 10)
+		return (errno = ENOMEM, NULL);
+	size = round_to_pow2(size, PAGE_ALIGN);
+	if (ptr != NULL && size == 0)
+		return (m_free(self, ptr), NULL);
+	if (ptr == NULL)
+		return (_realloc_alloc(self, size));
+	else
+		return (_realloc_inner(self, ptr, size));
+}