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47 lines
1 KiB
C
47 lines
1 KiB
C
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/* copyright (c) 2022 - 2023 grunfink / MIT license */
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#ifndef _XS_UNICODE_H
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#define _XS_UNICODE_H
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xs_str *xs_utf8_enc(xs_str *str, unsigned int cpoint);
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#ifdef XS_IMPLEMENTATION
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/** utf-8 **/
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xs_str *xs_utf8_enc(xs_str *str, unsigned int cpoint)
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/* encodes an Unicode codepoint to utf8 */
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{
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unsigned char tmp[4];
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int n = 0;
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if (cpoint < 0x80)
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tmp[n++] = cpoint & 0xff;
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else
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if (cpoint < 0x800) {
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tmp[n++] = 0xc0 | (cpoint >> 6);
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tmp[n++] = 0x80 | (cpoint & 0x3f);
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}
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else
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if (cpoint < 0x10000) {
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tmp[n++] = 0xe0 | (cpoint >> 12);
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tmp[n++] = 0x80 | ((cpoint >> 6) & 0x3f);
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tmp[n++] = 0x80 | (cpoint & 0x3f);
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}
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else
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if (cpoint < 0x200000) {
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tmp[n++] = 0xf0 | (cpoint >> 18);
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tmp[n++] = 0x80 | ((cpoint >> 12) & 0x3f);
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tmp[n++] = 0x80 | ((cpoint >> 6) & 0x3f);
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tmp[n++] = 0x80 | (cpoint & 0x3f);
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}
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return xs_append_m(str, (char *)tmp, n);
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}
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#endif /* XS_IMPLEMENTATION */
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#endif /* _XS_UNICODE_H */
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