diff options
Diffstat (limited to 'src/mem/ft_memccpy.c')
| -rw-r--r-- | src/mem/ft_memccpy.c | 58 |
1 files changed, 47 insertions, 11 deletions
diff --git a/src/mem/ft_memccpy.c b/src/mem/ft_memccpy.c index 8ce656a..2f6525a 100644 --- a/src/mem/ft_memccpy.c +++ b/src/mem/ft_memccpy.c @@ -6,26 +6,62 @@ /* By: cacharle <marvin@42.fr> +#+ +:+ +#+ */ /* +#+#+#+#+#+ +#+ */ /* Created: 2019/10/07 10:01:53 by cacharle #+# #+# */ -/* Updated: 2020/01/17 10:54:03 by cacharle ### ########.fr */ +/* Updated: 2020/04/01 21:50:29 by charles ### ########.fr */ /* */ /* ************************************************************************** */ #include "libft.h" +#define HIMAGIC 0x8080808080808080L +#define LOMAGIC 0x0101010101010101L + void *ft_memccpy(void *dest, const void *src, int c, size_t n) { - size_t i; - t_ftbyte *cast_dest; - t_ftbyte *cast_src; + uint64_t buf; + uint64_t lw; - cast_dest = (t_ftbyte*)dest; - cast_src = (t_ftbyte*)src; - i = -1; - while (++i < n) + 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) { - cast_dest[i] = cast_src[i]; - if (cast_dest[i] == (unsigned char)c) - return (cast_dest + i + 1); + 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); } |