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annotate lib/strcasecmp.c @ 17363:5a51fb7777a9

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sys_select, sys_time: port 2013-01-30 Solaris 2.6 fix to Cygwin Problem reported by Marco Atzeri in <http://lists.gnu.org/archive/html/bug-gnulib/2013-03/msg00000.html>. * lib/sys_select.in.h [HAVE_SYS_SELECT_H && _CYGWIN_SYS_TIME_H]: Simply delegate to the system <sys/select.h> in this case too. Also, pay attention to _GL_SYS_SELECT_H_REDIRECT_FROM_SYS_TIME_H only if OSF/1, since otherwise Cygwin breaks, and it doesn't seem to be needed on Solaris either. * lib/sys_time.in.h [_CYGWIN_SYS_TIME_H]: Simply delgate to the system <sys/time.h> in this case.
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 19 Mar 2013 09:08:47 -0700
parents e542fd46ad6f
children 344018b6e5d7
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1 /* Case-insensitive string comparison function.
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2 Copyright (C) 1998-1999, 2005-2007, 2009-2013 Free Software Foundation, Inc.
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3
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4 This program is free software; you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 2, or (at your option)
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7 any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program; if not, see <http://www.gnu.org/licenses/>. */
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16
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17 #include <config.h>
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18
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19 /* Specification. */
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20 #include <string.h>
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21
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22 #include <ctype.h>
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23 #include <limits.h>
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24
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25 #define TOLOWER(Ch) (isupper (Ch) ? tolower (Ch) : (Ch))
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26
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27 /* Compare strings S1 and S2, ignoring case, returning less than, equal to or
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28 greater than zero if S1 is lexicographically less than, equal to or greater
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29 than S2.
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30 Note: This function does not work with multibyte strings! */
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31
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32 int
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33 strcasecmp (const char *s1, const char *s2)
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34 {
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35 const unsigned char *p1 = (const unsigned char *) s1;
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36 const unsigned char *p2 = (const unsigned char *) s2;
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37 unsigned char c1, c2;
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38
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39 if (p1 == p2)
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40 return 0;
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41
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42 do
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43 {
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44 c1 = TOLOWER (*p1);
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45 c2 = TOLOWER (*p2);
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47 if (c1 == '\0')
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48 break;
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49
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50 ++p1;
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51 ++p2;
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52 }
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53 while (c1 == c2);
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54
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55 if (UCHAR_MAX <= INT_MAX)
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56 return c1 - c2;
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57 else
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58 /* On machines where 'char' and 'int' are types of the same size, the
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59 difference of two 'unsigned char' values - including the sign bit -
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60 doesn't fit in an 'int'. */
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61 return (c1 > c2 ? 1 : c1 < c2 ? -1 : 0);
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62 }