42 lines
2.4 KiB
C
42 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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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/unicode/unicode.h"
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extern const uint8_t kEastAsianWidth[];
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extern const uint32_t kEastAsianWidthBits;
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extern const uint8_t kCombiningChars[];
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extern const uint32_t kCombiningCharsBits;
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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 ((0 <= ucs && ucs < 32) || (0x7f <= ucs && 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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