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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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libc/str/strclen.c Normal file
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/*-*- 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/internal.h"
#include "libc/str/str.h"
/**
* Returns number of characters in UTF-8 string.
*/
size_t(strclen)(const char *s) { return strnclen(s, -1ull); }
noinline size_t(strnclen)(const char *s, size_t n) {
const unsigned char *p = (const unsigned char *)s;
size_t l = 0;
if (n) {
while (*p && n && iscont(*p)) ++p, --n;
while (*p) {
if (!iscont(*p++)) l++;
if (!--n) break;
}
}
return l;
}