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annotate lib/memcoll.c @ 9928:9a02133ad731

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Add tentative support for Linux libc5.
author Bruno Haible <bruno@clisp.org>
date Thu, 17 Apr 2008 02:01:23 +0200
parents bbbbbf4cd1c5
children e8d2c6fc33ad
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1 /* Locale-specific memory comparison.
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2
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3 Copyright (C) 1999, 2002, 2003, 2004, 2006 Free Software Foundation, Inc.
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4
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bbbbbf4cd1c5 Change copyright notice from GPLv2+ to GPLv3+.
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 3 of the License, or
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8 (at your option) any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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17
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18 /* Contributed by Paul Eggert <eggert@twinsun.com>. */
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19
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20 #include <config.h>
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21
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22 #include "memcoll.h"
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23
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24 #include <errno.h>
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25 #include <string.h>
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26
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27 /* Compare S1 (with length S1LEN) and S2 (with length S2LEN) according
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28 to the LC_COLLATE locale. S1 and S2 do not overlap, and are not
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29 adjacent. Perhaps temporarily modify the bytes after S1 and S2,
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30 but restore their original contents before returning. Set errno to an
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31 error number if there is an error, and to zero otherwise. */
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32 int
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33 memcoll (char *s1, size_t s1len, char *s2, size_t s2len)
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34 {
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35 int diff;
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36
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37 #if HAVE_STRCOLL
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38
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39 /* strcoll is slow on many platforms, so check for the common case
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40 where the arguments are bytewise equal. Otherwise, walk through
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41 the buffers using strcoll on each substring. */
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42
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43 if (s1len == s2len && memcmp (s1, s2, s1len) == 0)
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44 {
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45 errno = 0;
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46 diff = 0;
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47 }
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48 else
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49 {
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50 char n1 = s1[s1len];
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51 char n2 = s2[s2len];
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52
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53 s1[s1len++] = '\0';
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54 s2[s2len++] = '\0';
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55
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56 while (! (errno = 0, (diff = strcoll (s1, s2)) || errno))
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57 {
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58 /* strcoll found no difference, but perhaps it was fooled by NUL
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59 characters in the data. Work around this problem by advancing
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60 past the NUL chars. */
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61 size_t size1 = strlen (s1) + 1;
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62 size_t size2 = strlen (s2) + 1;
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63 s1 += size1;
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64 s2 += size2;
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65 s1len -= size1;
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66 s2len -= size2;
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67
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68 if (s1len == 0)
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69 {
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70 if (s2len != 0)
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71 diff = -1;
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72 break;
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73 }
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74 else if (s2len == 0)
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75 {
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76 diff = 1;
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77 break;
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78 }
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79 }
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80
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81 s1[s1len - 1] = n1;
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82 s2[s2len - 1] = n2;
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83 }
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84
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85 #else
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86
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87 diff = memcmp (s1, s2, s1len < s2len ? s1len : s2len);
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88 if (! diff)
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89 diff = s1len < s2len ? -1 : s1len != s2len;
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90 errno = 0;
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91
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92 #endif
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93
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94 return diff;
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95 }