Malloc/srcs/allocate/realloc.c at master · fedefloris/Malloc · GitHub

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/* ************************************************************************** */

/* */

/* ::: :::::::: */

/* realloc.c :+: :+: :+: */

/* +:+ +:+ +:+ */

/* By: ffloris <ffloris@student.42.fr> +#+ +:+ +#+ */

/* +#+#+#+#+#+ +#+ */

/* Created: 2018/04/03 13:39:16 by ffloris #+# #+# */

/* Updated: 2019/02/26 21:05:24 by ffloris ### ########.fr */

/* */

/* ************************************************************************** */

#include "malloc.h"

static void *reallocate_large_block(void *ptr, size_t size)

{

t_zone *zone;

zone = (t_zone*)ptr - 1;

if (zone->size - LARGE_ZONE_HEADER_SIZE >= size)

return (ptr);

if (!(ptr = allocate(size)))

return (NULL);

ft_memcpy(ptr, zone + 1, zone->size - LARGE_ZONE_HEADER_SIZE);

free_large_block(zone + 1);

return (ptr);

}

static void *reallocate_block(void *ptr, size_t size)

{

t_zone_type zone_type;

t_block *block;

t_zone *zone;

block = get_block_info(ptr, &zone, &zone_type);

if (IS_LARGE_ZONE(zone_type))

return (reallocate_large_block(ptr, size));

if (!block)

return (NULL);

if (BLOCK_SIZE(block->size_log2) - sizeof(t_block) >= size)

return (ptr);

if (!(ptr = allocate(size)))

return (NULL);

ft_memcpy(ptr, block + 1,

BLOCK_SIZE(block->size_log2) - sizeof(t_block));

free_block(block + 1);

return (ptr);

}

static void *reallocate(void *ptr, size_t size)

{

if (!ptr)

return (allocate(size));

if (!size)

{

free_block(ptr);

return (NULL);

}

return (reallocate_block(ptr, size));

}

void *realloc(void *ptr, size_t size)

{

pthread_mutex_lock(&g_mutex);

ptr = reallocate(ptr, size);

pthread_mutex_unlock(&g_mutex);

return (ptr);

}

Malloc/srcs/allocate/realloc.c at master · fedefloris/Malloc · GitHub

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