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annotate lib/unistr/u8-mblen.c @ 17429:88b6febaed97

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tests: port large-fd POSIX spawn tests to OS X Problem reported by Daiki Ueno in <http://lists.gnu.org/archive/html/bug-gnulib/2013-06/msg00031.html>. * tests/test-posix_spawn_file_actions_addclose.c: * tests/test-posix_spawn_file_actions_adddup2.c: * tests/test-posix_spawn_file_actions_addopen.c: Include <limits.h>, for OPEN_MAX, if available. (big_fd): New static function. (main): Use it.
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 11 Jun 2013 00:10:21 -0700
parents e542fd46ad6f
children
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1 /* Look at first character in UTF-8 string.
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Eric Blake <eblake@redhat.com>
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2 Copyright (C) 1999-2000, 2002, 2006-2007, 2009-2013 Free Software
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Jim Meyering <meyering@redhat.com>
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3 Foundation, Inc.
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4 Written by Bruno Haible <bruno@clisp.org>, 2002.
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5
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6 This program is free software: you can redistribute it and/or modify it
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7 under the terms of the GNU Lesser General Public License as published
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8 by the Free Software Foundation; either version 3 of the License, or
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9 (at 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,
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12 but 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 Lesser 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 Lesser General Public License
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17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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18
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19 #include <config.h>
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20
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21 /* Specification. */
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22 #include "unistr.h"
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23
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24 int
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25 u8_mblen (const uint8_t *s, size_t n)
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26 {
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27 if (n > 0)
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28 {
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29 /* Keep in sync with unistr.h and u8-mbtouc-aux.c. */
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30 uint8_t c = *s;
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31
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32 if (c < 0x80)
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33 return (c != 0 ? 1 : 0);
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34 if (c >= 0xc2)
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35 {
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36 if (c < 0xe0)
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37 {
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38 if (n >= 2
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39 #if CONFIG_UNICODE_SAFETY
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40 && (s[1] ^ 0x80) < 0x40
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41 #endif
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42 )
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43 return 2;
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44 }
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45 else if (c < 0xf0)
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46 {
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47 if (n >= 3
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48 #if CONFIG_UNICODE_SAFETY
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49 && (s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
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50 && (c >= 0xe1 || s[1] >= 0xa0)
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51 && (c != 0xed || s[1] < 0xa0)
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52 #endif
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53 )
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54 return 3;
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55 }
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56 else if (c < 0xf8)
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57 {
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58 if (n >= 4
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59 #if CONFIG_UNICODE_SAFETY
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60 && (s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
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61 && (s[3] ^ 0x80) < 0x40
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62 && (c >= 0xf1 || s[1] >= 0x90)
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63 #if 1
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64 && (c < 0xf4 || (c == 0xf4 && s[1] < 0x90))
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65 #endif
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66 #endif
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67 )
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68 return 4;
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69 }
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70 #if 0
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71 else if (c < 0xfc)
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72 {
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73 if (n >= 5
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74 #if CONFIG_UNICODE_SAFETY
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75 && (s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
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76 && (s[3] ^ 0x80) < 0x40 && (s[4] ^ 0x80) < 0x40
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77 && (c >= 0xf9 || s[1] >= 0x88)
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78 #endif
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79 )
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80 return 5;
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81 }
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82 else if (c < 0xfe)
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83 {
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84 if (n >= 6
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85 #if CONFIG_UNICODE_SAFETY
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86 && (s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
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87 && (s[3] ^ 0x80) < 0x40 && (s[4] ^ 0x80) < 0x40
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88 && (s[5] ^ 0x80) < 0x40
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89 && (c >= 0xfd || s[1] >= 0x84)
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90 #endif
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91 )
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92 return 6;
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93 }
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94 #endif
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95 }
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96 }
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97 /* invalid or incomplete multibyte character */
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98 return -1;
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99 }