annotate mcabber/mcabber/utf8.c @ 2347:db8de1b464d3 default tip

Reordered some lines of code for clarity
author franky
date Sat, 18 May 2019 20:41:52 +0200
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children
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1 /*
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2 * utf8.c -- UTF-8 routines
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3 *
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4 * Copyright (C) 2006 Reimar Döffinger <Reimar.Doeffinger@stud.uni-karlsruhe.de>
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5 *
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6 * This program is free software; you can redistribute it and/or modify
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7 * it under the terms of the GNU General Public License as published by
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8 * the Free Software Foundation; either version 2 of the License, or (at
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9 * your option) any later version.
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10 *
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11 * This program is distributed in the hope that it will be useful, but
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12 * WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 * General Public License for more details.
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15 *
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16 * You should have received a copy of the GNU General Public License
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17 * along with this program; if not, write to the Free Software
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Fabio Alessandro Locati <fabio@locati.cc>
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18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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19 * 02110-1301 USA
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20 */
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21
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22 #include "utf8.h"
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23
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24 char *prev_char(char *str, const char *limit)
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25 {
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26 if (str <= limit)
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27 return str;
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28 str--;
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29 if (utf8_mode)
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30 while ((str > limit) && ((*str & 0xc0) == 0x80))
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31 str--;
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32 return str;
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33 }
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34
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35 char *next_char(char *str)
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36 {
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37 if (!*str)
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38 return str;
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39 str++;
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40 if (utf8_mode)
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41 while ((*str & 0xc0) == 0x80)
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42 str++;
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43 return str;
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44 }
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45
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46 unsigned get_char(const char *str)
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47 {
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48 unsigned char *strp = (unsigned char *)str;
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49 unsigned c = *strp++;
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50 unsigned mask = 0x80;
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51 int len = -1;
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52 if (!utf8_mode)
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53 return c;
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54 while (c & mask) {
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55 mask >>= 1;
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56 len++;
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57 }
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58 if (len <= 0 || len > 4)
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59 goto no_utf8;
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60 c &= mask - 1;
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61 while ((*strp & 0xc0) == 0x80) {
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62 if (len-- <= 0)
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63 goto no_utf8;
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64 c = (c << 6) | (*strp++ & 0x3f);
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65 }
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66 if (len)
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67 goto no_utf8;
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68 return c;
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69
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70 no_utf8:
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71 return *str;
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72 }
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73
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74 char *put_char(char *str, unsigned c)
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75 {
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76 int mask = 0xffffffc0;
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77 int i = 4;
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78 char code[5];
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79 if (!utf8_mode || c < 128) {
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80 *str++ = c;
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81 return str;
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82 }
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83 while (c & mask) {
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84 code[i--] = 0x80 | (c & 0x3f);
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85 c >>= 6;
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86 mask >>= 1;
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87 if (i < 0) {
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88 *str++ = '?';
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89 return str;
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90 }
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91 }
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92 code[i] = (mask << 1) | c;
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93 for (; i < 5; i++)
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94 *str++ = code[i];
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95 return str;
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96 }
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97
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98 /* vim: set et cindent cinoptions=>2\:2(0 ts=2 sw=2: For Vim users... */