cosmopolitan/libc/str/endswith.c

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2020-06-15 14:18:57 +00:00
/*-*- 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/str/str.h"
/**
* Returns true if s has suffix.
*
* @param s is a NUL-terminated string
* @param suffix is also NUL-terminated
*/
bool(endswith)(const char *s, const char *suffix) {
size_t l1, l2;
if (s == suffix) return true;
l1 = strlen(s);
l2 = strnlen(suffix, l1);
if (l2 > l1) return false;
return memcmp(s + (l1 - l2) * sizeof(char), suffix, l2 * sizeof(char)) == 0;
}