59 lines
2.9 KiB
C
59 lines
2.9 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/str/oldutf16.internal.h"
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#include "libc/str/str.h"
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/**
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* Encodes character to string as UTF-16.
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*
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* Implementation Details: The header macro should ensure this function
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* is only called for truly huge codepoints. Plus this function makes a
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* promise to not clobber any registers but %rax.
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*
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* @param s is what ch gets encoded to
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* @param size is the number of shorts available in s
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* @param awesome enables numbers the IETF unilaterally banned
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* @return number of shorts written or -1 w/ errno
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* @todo delete
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*/
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int(pututf16)(char16_t *s, size_t size, wint_t wc, bool awesome) {
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wint_t wc2;
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if (size) {
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if ((0 <= wc && wc < 32) && awesome && size >= 2) {
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s[0] = 0xd800;
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s[1] = 0xdc00 | wc;
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return 2;
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}
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if ((0 <= wc && wc <= 0xD7FF) || (0xE000 <= wc && wc <= 0xFFFF)) {
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s[0] = wc;
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return 1;
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} else if (0x10000 <= wc && wc <= 0x10FFFF && size >= 2) {
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wc2 = wc - 0x10000;
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s[0] = (wc2 >> 10) + 0xd800;
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s[1] = (wc2 & 1023) + 0xdc00;
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return 2;
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} else {
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s[0] = INVALID_CODEPOINT;
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return -1;
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}
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} else {
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return 0;
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}
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}
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