38 lines
2.4 KiB
C
38 lines
2.4 KiB
C
/*-*- 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/unicode/unicode.h"
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/**
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* Returns cell width of monospace character.
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*/
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int wcwidth(wchar_t ucs) {
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if (ucs == 0) return 0;
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if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0)) {
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return -1;
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} else if (0 <= ucs && ucs < kCombiningCharsBits &&
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!!(kCombiningChars[ucs >> 3] & (1 << (ucs & 7)))) {
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return 0;
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} else if (0 <= ucs && ucs < kEastAsianWidthBits) {
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return 1 + !!(kEastAsianWidth[ucs >> 3] & (1 << (ucs & 7)));
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} else {
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return 1;
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}
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}
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