40 lines
2.3 KiB
C
40 lines
2.3 KiB
C
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/str/internal.h"
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#include "libc/str/str.h"
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/**
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* Returns number of characters in UTF-8 string.
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*/
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size_t(strclen)(const char *s) { return strnclen(s, -1ull); }
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noinline size_t(strnclen)(const char *s, size_t n) {
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const unsigned char *p = (const unsigned char *)s;
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size_t l = 0;
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if (n) {
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while (*p && n && iscont(*p)) ++p, --n;
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while (*p) {
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if (!iscont(*p++)) l++;
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if (!--n) break;
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}
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}
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return l;
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}
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