* Copyright 2025, Haiku, Inc. All rights reserved.
* Copyright 2008, Axel Dörfler, axeld@pinc-software.de.
* Distributed under the terms of the MIT license.
*/
#include <stdint.h>
#include <string.h>
#define LACKS_ZERO_BYTE(value) \
(((value - 0x01010101) & ~value & 0x80808080) == 0)
int
strncmp(char const *a, char const *b, size_t count)
{
if ((((addr_t)a) & 3) == 0 && (((addr_t)b) & 3) == 0) {
uint32_t *a32 = (uint32_t *)a;
uint32_t *b32 = (uint32_t *)b;
while (count >= 4 && *a32 == *b32 && LACKS_ZERO_BYTE((*a32))) {
a32++;
b32++;
count -= 4;
}
a = (const char *)a32;
b = (const char *)b32;
}
while (count > 0 && *a == *b && *a != 0) {
a++;
b++;
count--;
}
if (count == 0)
return 0;
return (unsigned char)*a - (unsigned char)*b;
}
