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/* $OpenBSD: strcasecmp.c,v 1.7 2015/08/31 02:53:57 guenther Exp $ */ |
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/* |
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* Copyright (c) 1987, 1993 |
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* The Regents of the University of California. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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#include <string.h> |
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typedef unsigned char u_char; |
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/* |
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* This array is designed for mapping upper and lower case letter |
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* together for a case independent comparison. The mappings are |
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* based upon ascii character sequences. |
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*/ |
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static const u_char charmap[] = { |
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'\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007', |
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'\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017', |
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'\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027', |
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'\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037', |
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'\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047', |
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'\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057', |
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'\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067', |
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'\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077', |
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'\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147', |
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'\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157', |
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'\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167', |
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'\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137', |
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'\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147', |
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'\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157', |
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'\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167', |
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'\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177', |
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'\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207', |
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'\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217', |
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'\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227', |
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'\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237', |
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'\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247', |
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'\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257', |
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'\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267', |
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'\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277', |
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'\300', '\301', '\302', '\303', '\304', '\305', '\306', '\307', |
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'\310', '\311', '\312', '\313', '\314', '\315', '\316', '\317', |
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'\320', '\321', '\322', '\323', '\324', '\325', '\326', '\327', |
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'\330', '\331', '\332', '\333', '\334', '\335', '\336', '\337', |
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'\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347', |
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'\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357', |
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'\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367', |
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'\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377', |
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}; |
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int |
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strcasecmp(const char *s1, const char *s2) |
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{ |
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const u_char *cm = charmap; |
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const u_char *us1 = (const u_char *)s1; |
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const u_char *us2 = (const u_char *)s2; |
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while (cm[*us1] == cm[*us2++]) |
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if (*us1++ == '\0') |
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return (0); |
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return (cm[*us1] - cm[*--us2]); |
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} |
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DEF_WEAK(strcasecmp); |
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int |
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strncasecmp(const char *s1, const char *s2, size_t n) |
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{ |
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if (n != 0) { |
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const u_char *cm = charmap; |
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const u_char *us1 = (const u_char *)s1; |
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const u_char *us2 = (const u_char *)s2; |
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do { |
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if (cm[*us1] != cm[*us2++]) |
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return (cm[*us1] - cm[*--us2]); |
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if (*us1++ == '\0') |
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break; |
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} while (--n != 0); |
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} |
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return (0); |
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} |
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DEF_WEAK(strncasecmp); |