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tutf8.c - iomenu - interactive terminal-based selection menu |
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git clone git://bitreich.org/iomenu git://hg6vgqziawt5s4dj.onion/iomenu (git://bitreich.org) |
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README |
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LICENSE |
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--- |
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tutf8.c (3175B) |
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--- |
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1 #include "utf8.h" |
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2 |
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3 #include <stddef.h> |
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4 #include <stdint.h> |
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5 |
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6 /* |
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7 * Copyright (c) 2008-2009 Bjoern Hoehrmann <bjoern@hoehrmann.de> |
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8 * |
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9 * Permission is hereby granted, free of charge, to any person obtaining a copy |
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10 * of this software and associated documentation files (the "Software"), to |
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11 * deal in the Software without restriction, including without limitation the |
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12 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
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13 * sell copies of the Software, and to permit persons to whom the Software is |
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14 * furnished to do so, subject to the following conditions: |
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15 * |
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16 * The above copyright notice and this permission notice shall be included in |
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17 * all copies or substantial portions of the Software. |
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18 * |
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19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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22 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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24 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
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25 * IN THE SOFTWARE. |
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26 */ |
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27 |
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28 size_t |
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29 utf8_encode(char *dest, uint32_t u) |
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30 { |
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31 size_t v, n, n2; |
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32 |
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33 if (u <= 0x7f) { |
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34 if (dest != NULL) |
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35 *dest = u; |
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36 return 1; |
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37 } |
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38 |
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39 for (v = 0x3f, n = 0; v >= u; ++n) |
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40 v = (v << 5) | 0x1f; |
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41 if (v >= 0x7fffffff) |
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42 return 0; /* cannot be encoded */ |
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43 |
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44 if (dest == NULL) |
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45 return 1 + n; |
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46 |
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47 *dest++ = (0xff << (7 - n)) | (u >> n * 6); |
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48 for (n2 = n - 1; n2 ; --n2) { |
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49 *dest++ = 0x80 | (u & 0x3f); |
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50 u >>= 6; |
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51 } |
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52 return 1 + n; |
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53 } |
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54 |
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55 /* Copyright (c) 2008-2009 Bjoern Hoehrmann <bjoern@hoehrmann.de> * |
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56 * See http://bjoern.hoehrmann.de/utf-8/decoder/dfa/ for details. */ |
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57 |
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58 static const uint8_t utf8d[] = { |
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59 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 00..1f */ |
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60 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 20..3f */ |
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61 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 40..5f */ |
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62 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 60..7f */ |
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63 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, /* 80..9f */ |
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64 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, /* a0..bf */ |
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65 8,8,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, /* c0..df */ |
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66 0xa,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x4,0x3,0x3, /* e0..ef */ |
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67 0xb,0x6,0x6,0x6,0x5,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8, /* f0..ff */ |
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68 0x0,0x1,0x2,0x3,0x5,0x8,0x7,0x1,0x1,0x1,0x4,0x6,0x1,0x1,0x1,0x1, /* s0..s0 */ |
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69 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,0,1,0,1,1,1,1,1,1, /* s1..s2 */ |
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70 1,2,1,1,1,1,1,2,1,2,1,1,1,1,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1, /* s3..s4 */ |
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71 1,2,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,1,1,1,1,3,1,3,1,1,1,1,1,1, /* s5..s6 */ |
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72 1,3,1,1,1,1,1,3,1,3,1,1,1,1,1,1,1,3,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* s7..s8 */ |
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73 }; |
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74 |
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75 uint32_t |
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76 utf8_decode(uint32_t *state, uint32_t *codep, uint32_t byte) |
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77 { |
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78 uint32_t type = utf8d[byte]; |
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79 |
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80 *codep = (*state != UTF8_ACCEPT) |
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81 ? (byte & 0x3fu) | (*codep << 6) |
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82 : (0xff >> type) & (byte); |
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83 *state = utf8d[256 + *state*16 + type]; |
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84 return *state; |
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85 } |
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