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annotate lib/strcasecmp.c @ 6056:4838606fdc03

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strcasecmp.c now uses mbuiter.
author Bruno Haible <bruno@clisp.org>
date Wed, 17 Aug 2005 14:01:07 +0000
parents 4cfaf4a21df2
children bbcddcd96f1f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* Case-insensitive string comparison function.
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2 Copyright (C) 1998, 1999, 2005 Free Software Foundation, Inc.
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3 Written by Bruno Haible <bruno@clisp.org>, 2005,
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4 based on earlier glibc code.
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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, or (at your option)
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9 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
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14 GNU 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 Foundation,
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18 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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19
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20 #ifdef HAVE_CONFIG_H
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21 # include <config.h>
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22 #endif
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23
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24 /* Specification. */
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25 #include "strcase.h"
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26
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27 #include <ctype.h>
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28
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29 #if HAVE_MBRTOWC
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30 # include "mbuiter.h"
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31 #endif
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32
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33 #define TOLOWER(Ch) (isupper (Ch) ? tolower (Ch) : (Ch))
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34
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35 /* Compare strings S1 and S2, ignoring case, returning less than, equal to or
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36 greater than zero if S1 is lexicographically less than, equal to or greater
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37 than S2.
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38 Note: This function may, in multibyte locales, return 0 for strings of
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39 different lengths! */
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40 int
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41 strcasecmp (const char *s1, const char *s2)
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42 {
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43 if (s1 == s2)
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44 return 0;
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45
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46 /* Be careful not to look at the entire extent of s1 or s2 until needed.
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47 This is useful because when two strings differ, the difference is
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48 most often already in the very few first characters. */
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49 #if HAVE_MBRTOWC
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50 if (MB_CUR_MAX > 1)
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51 {
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52 mbui_iterator_t iter1;
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53 mbui_iterator_t iter2;
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54
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55 mbui_init (iter1, s1);
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56 mbui_init (iter2, s2);
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57
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58 while (mbui_avail (iter1) && mbui_avail (iter2))
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59 {
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60 int cmp = mb_casecmp (mbui_cur (iter1), mbui_cur (iter2));
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61
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62 if (cmp != 0)
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63 return cmp;
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64
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65 mbui_advance (iter1);
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66 mbui_advance (iter2);
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67 }
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68 if (mbui_avail (iter1))
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69 /* s2 terminated before s1. */
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70 return 1;
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71 if (mbui_avail (iter2))
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72 /* s1 terminated before s2. */
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73 return -1;
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74 return 0;
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75 }
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76 else
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77 #endif
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78 {
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79 const unsigned char *p1 = (const unsigned char *) s1;
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80 const unsigned char *p2 = (const unsigned char *) s2;
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81 unsigned char c1, c2;
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82
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83 do
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84 {
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85 c1 = TOLOWER (*p1);
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86 c2 = TOLOWER (*p2);
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87
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88 if (c1 == '\0')
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89 break;
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90
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91 ++p1;
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92 ++p2;
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93 }
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94 while (c1 == c2);
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95
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96 return c1 - c2;
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97 }
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98 }