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ft_memmove.c
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ft_memmove.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_memmove.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: mbouthai <mbouthai@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2022/01/20 12:34:47 by mbouthai #+# #+# */
/* Updated: 2022/02/20 14:05:34 by mbouthai ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
static void *ft_memmove_left(unsigned char *dst, unsigned char *src, int n)
{
int index;
index = -1;
while (++index < n)
dst[index] = src[index];
return (dst);
}
static void *ft_memmove_right(unsigned char *dst, unsigned char *src, int n)
{
while (--n >= 0)
dst[n] = src[n];
return (dst);
}
void *ft_memmove(void *dst, const void *src, size_t n)
{
unsigned char *from;
unsigned char *to;
if (!dst && !src)
return (NULL);
from = (unsigned char *)src;
to = (unsigned char *)dst;
if (from > to && (size_t)(from - to) < n)
return (ft_memmove_left(to, from, n));
if (to > from && (size_t)(to - from) < n)
return (ft_memmove_right(to, from, n));
return (ft_memcpy(dst, src, n));
}