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annotate lib/memcasecmp.c @ 9729:7ebb4a06fabd

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Fix typo in comment.
author Atsushi SAKAI <sakaia@jp.fujitsu.com>
date Thu, 28 Feb 2008 15:26:44 +0100
parents bbbbbf4cd1c5
children e8d2c6fc33ad
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1 /* Case-insensitive buffer comparator.
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2 Copyright (C) 1996, 1997, 2000, 2003, 2006 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 3 of the License, or
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7 (at your option) 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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17 /* Written by Jim Meyering. */
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18
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19 #include <config.h>
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20
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21 #include "memcasecmp.h"
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22
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23 #include <ctype.h>
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24 #include <limits.h>
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25
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26 /* Like memcmp, but ignore differences in case.
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27 Convert to upper case (not lower) before comparing so that
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28 join -i works with sort -f. */
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29
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30 int
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31 memcasecmp (const void *vs1, const void *vs2, size_t n)
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32 {
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33 size_t i;
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34 char const *s1 = vs1;
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35 char const *s2 = vs2;
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36 for (i = 0; i < n; i++)
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37 {
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38 unsigned char u1 = s1[i];
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39 unsigned char u2 = s2[i];
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40 int U1 = toupper (u1);
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41 int U2 = toupper (u2);
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42 int diff = (UCHAR_MAX <= INT_MAX ? U1 - U2
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43 : U1 < U2 ? -1 : U2 < U1);
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44 if (diff)
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45 return diff;
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46 }
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47 return 0;
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48 }