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annotate lib/memcasecmp.c @ 4547:8f5277cd7865

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* memcasecmp.c: Remove unnecessary parentheses after 'defined'. (memcasecmp): Don't assume size_t fits in unsigned int. Remove casts and duplicate code.
author Paul Eggert <eggert@cs.ucla.edu>
date Thu, 14 Aug 2003 23:27:24 +0000
parents df44e79ce676
children a48fb0e98c8c
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1 /* Case-insensitive buffer comparator.
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2 Copyright (C) 1996, 1997, 2000, 2003 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, write to the Free Software Foundation,
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16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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17
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18 /* Written by Jim Meyering. */
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19
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20 #if 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 #include <ctype.h>
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25
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26 #if defined STDC_HEADERS || (!defined isascii && !defined HAVE_ISASCII)
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27 # define IN_CTYPE_DOMAIN(Char) 1
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28 #else
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29 # define IN_CTYPE_DOMAIN(Char) isascii (Char)
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30 #endif
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31 #define ISLOWER(Char) (IN_CTYPE_DOMAIN (Char) && islower (Char))
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32
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33 #if _LIBC || STDC_HEADERS
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34 # define TOUPPER(Char) toupper (Char)
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35 #else
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36 # define TOUPPER(Char) (ISLOWER (Char) ? toupper (Char) : (Char))
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37 #endif
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38
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39 #include "memcasecmp.h"
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40
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41 /* Like memcmp, but ignore differences in case.
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42 Convert to upper case (not lower) before comparing so that
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43 join -i works with sort -f. */
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44
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45 int
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46 memcasecmp (const void *vs1, const void *vs2, size_t n)
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47 {
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48 size_t i;
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49 char const *s1 = vs1;
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50 char const *s2 = vs2;
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51 for (i = 0; i < n; i++)
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52 {
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53 unsigned char u1 = s1[i];
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54 unsigned char u2 = s2[i];
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55 int diff = TOUPPER (u1) - TOUPPER (u2);
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56 if (diff)
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57 return diff;
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58 }
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59 return 0;
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60 }