48 lines
2.5 KiB
C
48 lines
2.5 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/errno.h"
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#include "libc/str/str.h"
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#include "libc/str/utf16.h"
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/* TODO: DELETE */
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/**
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* Decodes UTF-16 character.
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*
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* @param s is a NUL-terminated string
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* @return number of bytes (NUL counts as 1) or -1 w/ errno
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* @note synchronization is performed to skip leading continuations;
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* canonicalization and validation are performed to some extent
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* @todo delete
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*/
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forcealignargpointer unsigned(getutf16)(const char16_t *p, wint_t *wc) {
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unsigned skip = 0;
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while (IsUtf16Cont(p[skip])) skip++;
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if (IsUcs2(p[skip])) {
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*wc = p[skip];
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return skip + 1;
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} else if (!IsUtf16Cont(p[skip + 1])) {
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*wc = INVALID_CODEPOINT;
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return -1;
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} else {
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*wc = MergeUtf16(p[skip], p[skip + 1]);
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return skip + 2;
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}
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}
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