70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
/* 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 char* fromchar_unicode(unsigned int* uc, const char* s) {
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unsigned char* p;
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unsigned int v;
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unsigned char n;
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if (*(p = (void*)s) <= 0x7f) {
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*uc = *s;
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return s + 1;
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}
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memcpy(&v, s, 4);
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*uc = 0;
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if (IS_LITTLE_ENDIAN) {
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if ((v&0x0000c0e0) == 0x000080c0) {
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n = 2;
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*uc |= *(p++)&0x1f;
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} else {
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if ((v&0x00c0c0f0) == 0x008080e0) {
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n = 3;
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*uc |= *(p++)&0x0f;
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} else if ((v&0xc0c0c0f8) == 0x808080f0) {
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n = 4;
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*uc |= *(p++)&0x07;
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*uc <<= 6;
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*uc |= *(p++)&0x3f;
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} else return (void*)(size_t)(*uc = 0);
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*uc <<= 6;
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*uc |= *(p++)&0x3f;
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}
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} else {
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if ((v&0xe0c00000) == 0xc0800000) {
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n = 2;
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*uc |= *(p++)&0x1f;
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} else {
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if ((v&0xf8c0c0c0) == 0xf0808080) {
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n = 3;
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*uc |= *(p++)&0x0f;
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} else if ((v&0xf0c0c000) == 0xe0808000) {
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n = 4;
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*uc |= *(p++)&0x07;
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*uc <<= 6;
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*uc |= *(p++)&0x3f;
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} else return (void*)(size_t)(*uc = 0);
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*uc <<= 6;
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*uc |= *(p++)&0x3f;
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}
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}
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*uc <<= 6;
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*uc |= *(p++)&0x3f;
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#ifndef UNICODE_CHARSIZE_CHECK_DISABLE
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if ((n == 2 && *uc > 0x0007ff) ||
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(n == 3 && *uc > 0x00ffff) ||
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(n == 4 && *uc > 0x10ffff))
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return (void*)(size_t)(*uc = 0);
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#endif
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return s + n;
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}
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