cosmopolitan/libc/nexgen32e/tinystrncmp.ncabi.c

36 lines
2.2 KiB
C

/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/limits.h"
#include "libc/nexgen32e/tinystrcmp.h"
/**
* Compares strings w/ limit & no-clobber abi guarantee.
*/
int(tinystrncmp)(const char *s1, const char *s2, size_t n) {
size_t i;
if (!n) return 0;
i = SIZE_MAX;
while (s1[++i]) {
if (s1[i] != s2[i]) break;
if (!--n) break;
}
return (int)(unsigned char)s1[i] - (int)(unsigned char)s2[i];
}