79 lines
2.4 KiB
C
79 lines
2.4 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: tomoron <tomoron@student.42angouleme.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2024/12/02 14:41:22 by tomoron #+# #+# */
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/* Updated: 2024/12/03 18:57:50 by tomoron ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "includes/malloc.h"
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t_mem_chunk *get_alloc_chunk(t_alloc *alloc, t_mem_chunk *first, size_t size);
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int get_prev_alloc(t_alloc **alloc, t_alloc **res, t_alloc *cur);
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static void *realloc_recreate(t_alloc *alloc, size_t size)
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{
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void *new;
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new = malloc(size);
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if (alloc->size < size)
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size = alloc->size;
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ft_memcpy(new, alloc + 1, size);
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free(alloc + 1);
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return (new);
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}
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static void *realloc_prealloc(t_alloc *alloc, t_mem_chunk *chunk, \
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int is_small, size_t size)
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{
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t_alloc *prev;
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chunk = get_alloc_chunk(alloc, chunk, is_small);
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if (!chunk)
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return (0);
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if (!get_prev_alloc(&alloc, &prev, chunk->first))
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return (0);
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if (alloc->size >= size)
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{
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chunk->space_left += alloc->size - size;
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alloc->size = size;
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return (alloc + 1);
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}
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if ((size > (size_t)TINY_CHUNK_SIZE && is_small == 0)
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|| (size > SMALL_CHUNK_SIZE && is_small == 1)
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|| (t_ul)(alloc->next) - (t_ul)(alloc + 1) < size)
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return (realloc_recreate(alloc, size));
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chunk->space_left -= size - alloc->size;
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alloc->size = size;
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return (alloc + 1);
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}
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static void *realloc_large(t_alloc *alloc, size_t size)
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{
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t_alloc *prev;
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if (!get_prev_alloc(&alloc, &prev, g_allocs.large))
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return (0);
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return (realloc_recreate(alloc, size));
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}
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void *realloc(void *ptr, size_t size)
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{
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t_alloc *alloc;
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if (!ptr)
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return (malloc(size));
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alloc = (t_alloc *)ptr - 1;
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ptr = realloc_prealloc(alloc, g_allocs.tiny, 0, size);
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if (ptr)
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return (ptr);
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ptr = realloc_prealloc(alloc, g_allocs.small, 1, size);
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if (ptr)
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return (ptr);
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return (realloc_large(alloc, size));
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}
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