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annotate src/libvterm/src/utf8.h @ 20518:a4652d7ec99f v8.2.0813

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patch 8.2.0813: libvterm code is slightly different from upstream Commit: https://github.com/vim/vim/commit/591cec8366e87a172495c362477cbf5de8d399f0 Author: Bram Moolenaar <Bram@vim.org> Date: Fri May 22 22:06:06 2020 +0200 patch 8.2.0813: libvterm code is slightly different from upstream Problem: libvterm code is slightly different from upstream. Solution: Use upstream text to avoid future merge problems. Mainly comment style changes.
author Bram Moolenaar <Bram@vim.org>
date Fri, 22 May 2020 22:15:04 +0200
parents 811a12a78164
children
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1 /* The following functions copied and adapted from libtermkey
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2 *
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3 * http://www.leonerd.org.uk/code/libtermkey/
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4 */
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5 unsigned int utf8_seqlen(long codepoint);
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6
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7 #if defined(DEFINE_INLINES) || USE_INLINE
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8 INLINE unsigned int utf8_seqlen(long codepoint)
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9 {
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10 if(codepoint < 0x0000080) return 1;
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11 if(codepoint < 0x0000800) return 2;
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12 if(codepoint < 0x0010000) return 3;
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13 if(codepoint < 0x0200000) return 4;
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14 if(codepoint < 0x4000000) return 5;
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15 return 6;
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16 }
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17 #endif
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18
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19 /* Does NOT NUL-terminate the buffer */
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20 int fill_utf8(long codepoint, char *str);
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21
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22 #if defined(DEFINE_INLINES) || USE_INLINE
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23 INLINE int fill_utf8(long codepoint, char *str)
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24 {
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25 int nbytes = utf8_seqlen(codepoint);
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26
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27 // This is easier done backwards
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28 int b = nbytes;
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29 while(b > 1) {
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30 b--;
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31 str[b] = 0x80 | (codepoint & 0x3f);
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32 codepoint >>= 6;
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33 }
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34
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35 switch(nbytes) {
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36 case 1: str[0] = (codepoint & 0x7f); break;
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37 case 2: str[0] = 0xc0 | (codepoint & 0x1f); break;
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38 case 3: str[0] = 0xe0 | (codepoint & 0x0f); break;
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39 case 4: str[0] = 0xf0 | (codepoint & 0x07); break;
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40 case 5: str[0] = 0xf8 | (codepoint & 0x03); break;
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41 case 6: str[0] = 0xfc | (codepoint & 0x01); break;
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42 }
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43
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44 return nbytes;
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45 }
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46 #endif
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47 /* end copy */