53 lines
1.2 KiB
C
53 lines
1.2 KiB
C
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/* This software is licensed by the MIT License, see LICENSE file */
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/* Copyright © 2022 Gregory Lirent */
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#include "build.h"
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const char16_t* fromchar16_unicode(unsigned int* uc, const char16_t* s) {
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unsigned char n;
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unsigned short* p;
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unsigned int v;
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*uc = n = 0;
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p = (void*)s;
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memcpy(&v, s, 4);
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if (IS_LITTLE_ENDIAN) {
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if ((v&0xfc00fc00) == 0xdc00d800) {
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*uc = *(p++)&0x03ff;
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*uc <<= 10;
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*uc |= (*p&0x03ff);
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*uc += 0x010000;
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n = 2;
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} else if ((v&0x0000f800) != 0x0000d800) {
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*uc = *p;
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n = 2;
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}
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} else {
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if ((v&0xfc00fc00) == 0xd800dc00) {
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*uc = *(p++)&0x03ff;
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*uc <<= 10;
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*uc |= (*p&0x03ff);
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*uc += 0x010000;
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n = 2;
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} else if ((v&0xf8000000) != 0xd8000000) {
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*uc = *p;
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n = 1;
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}
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}
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#ifndef UNICODE_CHARSIZE_CHECK_DISABLE
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if (n == 1 && *uc >= 0xd800 && *uc <= 0xdfff)
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return (void*)(size_t)(*uc = 0);
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#endif
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if (n) return s + n;
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return (void*)0;
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}
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