1/* The following functions copied and adapted from libtermkey
2 *
3 * http://www.leonerd.org.uk/code/libtermkey/
4 */
5static 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 */
16static 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