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61 lines
3.2 KiB
C
61 lines
3.2 KiB
C
/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8 -*-│
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│ vi: set noet ft=c ts=8 sw=8 fenc=utf-8 :vi │
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╚──────────────────────────────────────────────────────────────────────────────╝
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│ │
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│ Musl Libc │
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│ Copyright © 2005-2014 Rich Felker, et al. │
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│ │
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│ Permission is hereby granted, free of charge, to any person obtaining │
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│ a copy of this software and associated documentation files (the │
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│ "Software"), to deal in the Software without restriction, including │
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│ without limitation the rights to use, copy, modify, merge, publish, │
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│ distribute, sublicense, and/or sell copies of the Software, and to │
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│ permit persons to whom the Software is furnished to do so, subject to │
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│ the following conditions: │
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│ │
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│ The above copyright notice and this permission notice shall be │
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│ included in all copies or substantial portions of the Software. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
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│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
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│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
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│ IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY │
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│ CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, │
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│ TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE │
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│ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. │
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│ │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/str/unicode.h"
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__static_yoink("musl_libc_notice");
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// clang-format off
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static const unsigned char table[] = {
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#include "nonspacing.inc"
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};
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static const unsigned char wtable[] = {
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#include "wide.inc"
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};
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int wcwidth(wchar_t wc)
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{
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if ((int)wc < 0xff) {
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if ((int)wc >= 0)
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return ((wc+1) & 0x7f) >= 0x21 ? 1 : wc ? -1 : 0;
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return -1;
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}
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if ((wc & 0xfffeffffU) < 0xfffe) {
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if ((table[table[wc>>8]*32+((wc&255)>>3)]>>(wc&7))&1)
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return 0;
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if ((wtable[wtable[wc>>8]*32+((wc&255)>>3)]>>(wc&7))&1)
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return 2;
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return 1;
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}
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if ((wc & 0xfffe) == 0xfffe)
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return -1;
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if (wc-0x20000U < 0x20000)
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return 2;
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if (wc == 0xe0001 || wc-0xe0020U < 0x5f || wc-0xe0100U < 0xef)
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return 0;
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return 1;
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}
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