stricmp.c

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00001 /*
00002  * Copyright (C) 2004 by egnite Software GmbH. All rights reserved.
00003  *
00004  * Redistribution and use in source and binary forms, with or without
00005  * modification, are permitted provided that the following conditions
00006  * are met:
00007  *
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the copyright holders nor the names of
00014  *    contributors may be used to endorse or promote products derived
00015  *    from this software without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY EGNITE SOFTWARE GMBH AND CONTRIBUTORS
00018  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00019  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
00020  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL EGNITE
00021  * SOFTWARE GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
00022  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
00023  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
00024  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
00025  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00026  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
00027  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00028  * SUCH DAMAGE.
00029  *
00030  * For additional information see http://www.ethernut.de/
00031  *
00032  *-
00033  * Copyright (c) 1987, 1993
00034  *  The Regents of the University of California.  All rights reserved.
00035  *
00036  * Redistribution and use in source and binary forms, with or without
00037  * modification, are permitted provided that the following conditions
00038  * are met:
00039  * 1. Redistributions of source code must retain the above copyright
00040  *    notice, this list of conditions and the following disclaimer.
00041  * 2. Redistributions in binary form must reproduce the above copyright
00042  *    notice, this list of conditions and the following disclaimer in the
00043  *    documentation and/or other materials provided with the distribution.
00044  * 3. Neither the name of the University nor the names of its contributors
00045  *    may be used to endorse or promote products derived from this software
00046  *    without specific prior written permission.
00047  *
00048  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
00049  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00050  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00051  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
00052  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00053  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00054  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00055  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00056  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00057  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00058  * SUCH DAMAGE.
00059  */
00060 
00061 /*
00062  * $Log: stricmp.c,v $
00063  * Revision 1.2  2006/10/08 16:48:08  haraldkipp
00064  * Documentation fixed
00065  *
00066  * Revision 1.1  2004/09/08 10:24:00  haraldkipp
00067  * Generic C string library added
00068  *
00069  */
00070 
00071 #include <compiler.h>
00072 #include <string.h>
00073 
00078 
00079 typedef unsigned char u_char;
00080 
00081 /*
00082  * This array is designed for mapping upper and lower case letter
00083  * together for a case independent comparison.  The mappings are
00084  * based upon ascii character sequences.
00085  */
00086 static CONST u_char charmap[] = {
00087     '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007',
00088     '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017',
00089     '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027',
00090     '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037',
00091     '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047',
00092     '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057',
00093     '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067',
00094     '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077',
00095     '\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
00096     '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
00097     '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
00098     '\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137',
00099     '\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
00100     '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
00101     '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
00102     '\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177',
00103     '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207',
00104     '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217',
00105     '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227',
00106     '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237',
00107     '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247',
00108     '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257',
00109     '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267',
00110     '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277',
00111     '\300', '\301', '\302', '\303', '\304', '\305', '\306', '\307',
00112     '\310', '\311', '\312', '\313', '\314', '\315', '\316', '\317',
00113     '\320', '\321', '\322', '\323', '\324', '\325', '\326', '\327',
00114     '\330', '\331', '\332', '\333', '\334', '\335', '\336', '\337',
00115     '\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
00116     '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
00117     '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
00118     '\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377',
00119 };
00120 
00135 int stricmp(CONST char *s1, CONST char *s2)
00136 {
00137     CONST u_char *cm = charmap;
00138     CONST u_char *us1 = (CONST u_char *) s1;
00139     CONST u_char *us2 = (CONST u_char *) s2;
00140 
00141     while (cm[*us1] == cm[*us2++]) {
00142         if (*us1++ == '\0') {
00143             return 0;
00144         }
00145     }
00146 
00147     return cm[*us1] - cm[*--us2];
00148 }
00149 
00165 int strnicmp(CONST char *s1, CONST char *s2, size_t n)
00166 {
00167     if (n != 0) {
00168         CONST u_char *cm = charmap;
00169         CONST u_char *us1 = (CONST u_char *) s1;
00170         CONST u_char *us2 = (CONST u_char *) s2;
00171 
00172         do {
00173             if (cm[*us1] != cm[*us2++]) {
00174                 return cm[*us1] - cm[*--us2];
00175             }
00176             if (*us1++ == '\0') {
00177                 break;
00178             }
00179         } while (--n);
00180     }
00181     return 0;
00182 }
00183 

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