tcpdump.tproj/strcasecmp.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.0 (the 'License').  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License."
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Copyright (c) 1987 Regents of the University of California.
  26  * All rights reserved.
  27  *
  28  * Redistribution and use in source and binary forms are permitted
  29  * provided that this notice is preserved and that due credit is given
  30  * to the University of California at Berkeley. The name of the University
  31  * may not be used to endorse or promote products derived from this
  32  * software without specific written prior permission. This software
  33  * is provided ``as is'' without express or implied warranty.
  34  */
  35
  36 #if defined(LIBC_SCCS) && !defined(lint)
  37 static const char sccsid[] = "@(#)strcasecmp.c  5.5 (Berkeley) 11/24/87";
  38 #endif /* LIBC_SCCS and not lint */
  39
  40 #include <sys/types.h>
  41
  42 #include "interface.h"
  43
  44 /*
  45  * This array is designed for mapping upper and lower case letter
  46  * together for a case independent comparison.  The mappings are
  47  * based upon ascii character sequences.
  48  */
  49 static u_char charmap[] = {
  50         '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007',
  51         '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017',
  52         '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027',
  53         '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037',
  54         '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047',
  55         '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057',
  56         '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067',
  57         '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077',
  58         '\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
  59         '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
  60         '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
  61         '\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137',
  62         '\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
  63         '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
  64         '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
  65         '\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177',
  66         '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207',
  67         '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217',
  68         '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227',
  69         '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237',
  70         '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247',
  71         '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257',
  72         '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267',
  73         '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277',
  74         '\300', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
  75         '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
  76         '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
  77         '\370', '\371', '\372', '\333', '\334', '\335', '\336', '\337',
  78         '\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
  79         '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
  80         '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
  81         '\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377',
  82 };
  83
  84 __private_extern__
  85 int
  86 strcasecmp(s1, s2)
  87         const char *s1, *s2;
  88 {
  89         register u_char *cm = charmap,
  90                         *us1 = (u_char *)s1,
  91                         *us2 = (u_char *)s2;
  92
  93         while (cm[*us1] == cm[*us2++])
  94                 if (*us1++ == '\0')
  95                         return(0);
  96         return(cm[*us1] - cm[*--us2]);
  97 }
  98
  99 int
 100 strncasecmp(s1, s2, n)
 101         const char *s1, *s2;
 102         register int n;
 103 {
 104         register u_char *cm = charmap,
 105                         *us1 = (u_char *)s1,
 106                         *us2 = (u_char *)s2;
 107
 108         while (--n >= 0 && cm[*us1] == cm[*us2++])
 109                 if (*us1++ == '\0')
 110                         return(0);
 111         return(n < 0 ? 0 : cm[*us1] - cm[*--us2]);
 112 }