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