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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_memccpy.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: cacharle <marvin@42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2019/10/07 10:01:53 by cacharle #+# #+# */
/* Updated: 2020/01/17 10:54:03 by cacharle ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
#define HIMAGIC 0x8080808080808080L
#define LOMAGIC 0x0101010101010101L
void *ft_memccpy(void *dest, const void *src, int c, size_t n)
{
uint64_t buf;
uint64_t lw;
if (dest == src)
return (dest);
c = (uint8_t)c;
while ((n & 0b111) != 0)
{
*(uint8_t*)dest = *(uint8_t*)src;
if (*(uint8_t*)dest == c)
return ((uint8_t*)dest + 1);
src++;
dest++;
n--;
}
buf = (uint64_t)c | (uint64_t)c << 8 | (uint64_t)c << 16
| (uint64_t)c << 24 | (uint64_t)c << 32 | (uint64_t)c << 40
| (uint64_t)c << 48 | (uint64_t)c << 56;
while (n > 0)
{
lw = *(uint64_t*)src ^ buf;
if ((lw - LOMAGIC) & ~lw & HIMAGIC)
{
if ( (((uint8_t*)dest)[0] = ((uint8_t*)src)[0]) == (uint8_t)c)
return ((uint8_t*)dest + 1);
if ( (((uint8_t*)dest)[1] = ((uint8_t*)src)[1]) == (uint8_t)c)
return ((uint8_t*)dest + 2);
if ( (((uint8_t*)dest)[2] = ((uint8_t*)src)[2]) == (uint8_t)c)
return ((uint8_t*)dest + 3);
if ( (((uint8_t*)dest)[3] = ((uint8_t*)src)[3]) == (uint8_t)c)
return ((uint8_t*)dest + 4);
if ( (((uint8_t*)dest)[4] = ((uint8_t*)src)[4]) == (uint8_t)c)
return ((uint8_t*)dest + 5);
if ( (((uint8_t*)dest)[5] = ((uint8_t*)src)[5]) == (uint8_t)c)
return ((uint8_t*)dest + 6);
if ( (((uint8_t*)dest)[6] = ((uint8_t*)src)[6]) == (uint8_t)c)
return ((uint8_t*)dest + 7);
if ( (((uint8_t*)dest)[7] = ((uint8_t*)src)[7]) == (uint8_t)c)
return ((uint8_t*)dest + 8);
}
else
*(uint64_t*)dest = *(uint64_t*)src;
n -= 8;
dest += 8;
src += 8;
}
return (NULL);
}
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