1 /* The following functions copied and adapted from libtermkey 2 * 3 * http://www.leonerd.org.uk/code/libtermkey/ 4 */ 5 static inline unsigned int utf8_seqlen(long codepoint) 6 { 7 if(codepoint < 0x0000080) return 1; 8 if(codepoint < 0x0000800) return 2; 9 if(codepoint < 0x0010000) return 3; 10 if(codepoint < 0x0200000) return 4; 11 if(codepoint < 0x4000000) return 5; 12 return 6; 13 } 14 15 /* Does NOT NUL-terminate the buffer */ 16 static int fill_utf8(long codepoint, char *str) 17 { 18 int nbytes = utf8_seqlen(codepoint); 19 20 // This is easier done backwards 21 int b = nbytes; 22 while(b > 1) { 23 b--; 24 str[b] = 0x80 | (codepoint & 0x3f); 25 codepoint >>= 6; 26 } 27 28 switch(nbytes) { 29 case 1: str[0] = (codepoint & 0x7f); break; 30 case 2: str[0] = 0xc0 | (codepoint & 0x1f); break; 31 case 3: str[0] = 0xe0 | (codepoint & 0x0f); break; 32 case 4: str[0] = 0xf0 | (codepoint & 0x07); break; 33 case 5: str[0] = 0xf8 | (codepoint & 0x03); break; 34 case 6: str[0] = 0xfc | (codepoint & 0x01); break; 35 } 36 37 return nbytes; 38 } 39 /* end copy */ 40
