40 lines
1.0 KiB
C
40 lines
1.0 KiB
C
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/* The following functions copied and adapted from libtermkey
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*
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* http://www.leonerd.org.uk/code/libtermkey/
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*/
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static inline unsigned int utf8_seqlen(long codepoint)
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{
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if(codepoint < 0x0000080) return 1;
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if(codepoint < 0x0000800) return 2;
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if(codepoint < 0x0010000) return 3;
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if(codepoint < 0x0200000) return 4;
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if(codepoint < 0x4000000) return 5;
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return 6;
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}
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/* Does NOT NUL-terminate the buffer */
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static int fill_utf8(long codepoint, char *str)
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{
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int nbytes = utf8_seqlen(codepoint);
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// This is easier done backwards
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int b = nbytes;
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while(b > 1) {
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b--;
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str[b] = 0x80 | (codepoint & 0x3f);
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codepoint >>= 6;
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}
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switch(nbytes) {
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case 1: str[0] = (codepoint & 0x7f); break;
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case 2: str[0] = 0xc0 | (codepoint & 0x1f); break;
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case 3: str[0] = 0xe0 | (codepoint & 0x0f); break;
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case 4: str[0] = 0xf0 | (codepoint & 0x07); break;
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case 5: str[0] = 0xf8 | (codepoint & 0x03); break;
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case 6: str[0] = 0xfc | (codepoint & 0x01); break;
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}
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return nbytes;
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}
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/* end copy */
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