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annotate lib/memcasecmp.c @ 6927:fa896bb33133

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* lib/memcasecmp.c: Include <limits.h>. (memcasecmp): Don't assume UCHAR_MAX <= INT_MAX. * lib/strtod.c (strtod): Don't assume isspace works on negative chars. Don't assume isdigit succeeds only on '0' through '9'. * lib/exclude.c (IN_CTYPE_DOMAIN, is_space): Remove; no longer needed. All uses of is_space replaced by isspace. * lib/fnmatch.c (ISASCII): Remove; no longer needed. All uses removed. (ISPRINT, ISDIGIT, ISALNUM, ISALPHA, ISCNTRL, ISLOWER, ISPUNCT): (ISSPACE, ISUPPER, ISXDIGIT): Remove; no longer needed. All uses replaced by isprint etc. * lib/getdate.y (IN_CTYPE_DOMAIN, ISSPACE, ISALPHA, ISLOWER): Likewise. * lib/getusershell.c (IN_CTYPE_DOMAIN, ISSPACE): Likewise. * lib/memcasecmp.c (IN_CTYPE_DOMAIN, ISLOWER, TOUPPER): Likewise. * lib/strtod.c (IN_CTYPE_DOMAIN, ISSPACE, ISDIGIT, TOLOWER): Likewise. * lib/strtol.c (IN_CTYPE_DOMAIN): Likewise. * lib/xstrtol.c (IN_CTYPE_DOMAIN, ISSPACE): Likewise. * m4/xstrtol.m4 (gl_PREREQ_XSTRTOL): Use AC_CHECK_DECLS_ONCE rather than AC_CHECK_DECLS for strtoimax and strtoumax. * m4/getusershell.m4 (gl_PREREQ_GETUSERSHELL): Remove; no longer needed. All uses removed. * m4/strtol.m4 (gl_PREREQ_STRTOL): Likewise. * m4/strtoul.m4 (gl_PREREQ_STRTOUL): Likewise. * m4/exclude.m4 (gl_EXCLUDE): Don't check for isascii; no longer needed. * m4/getdate.m4 (gl_GETDATE): Likewise. * m4/getusershell.m4 (gl_PREREQ_GETUSERSHELL): Likewise. * m4/memcasecmp.m4 (gl_MEMCASECMP): Likewise. * m4/strtod.m4 (gl_FUNC_STRTOD): Likewise. * m4/strtol.m4 (gl_PREREQ_STRTOL): Likewise. * m4/strtoul.m4 (gl_PREREQ_STRTOUL): Likewise. * m4/xstrtol.m4 (gl_PREREQ_XSTRTOL): Likewise. * m4/exclude.m4 (gl_EXCLUDE): Don't require AC_C_INLINE; no longer needed. * m4/calloc.m4 (_AC_FUNC_CALLOC_IF): Don't require AC_HEADER_STDC; no longer needed. * m4/exclude.m4 (gl_EXCLUDE): Likewise. * m4/getdate.m4 (gl_GETDATE): Likewise. * m4/getusershell.m4 (gl_PREREQ_GETUSERSHELL): Likewise. * m4/memcasecmp.m4 (gl_MEMCASECMP): Likewise. * m4/strtod.m4 (gl_FUNC_STRTOD): Likewise. * m4/strtol.m4 (gl_PREREQ_STRTOL): Likewise. * m4/xstrtol.m4 (gl_PREREQ_XSTRTOL): Likewise.
author Paul Eggert <eggert@cs.ucla.edu>
date Wed, 05 Jul 2006 23:35:19 +0000
parents 96c32553b4c6
children 8a1a9361108c
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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 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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 #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 #include "memcasecmp.h"
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25
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26 #include <ctype.h>
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27 #include <limits.h>
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28
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29 /* Like memcmp, but ignore differences in case.
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30 Convert to upper case (not lower) before comparing so that
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31 join -i works with sort -f. */
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32
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33 int
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34 memcasecmp (const void *vs1, const void *vs2, size_t n)
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35 {
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36 size_t i;
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37 char const *s1 = vs1;
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38 char const *s2 = vs2;
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39 for (i = 0; i < n; i++)
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40 {
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41 unsigned char u1 = s1[i];
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42 unsigned char u2 = s2[i];
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43 int U1 = toupper (u1);
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44 int U2 = toupper (u2);
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45 int diff = (UCHAR_MAX <= INT_MAX ? U1 - U2
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46 : U1 < U2 ? -1 : U2 < U1);
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47 if (diff)
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48 return diff;
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49 }
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50 return 0;
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51 }