1 /* 2 * Copyright (c) 1987, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 #include <string.h> 36 37 #if defined(LIBC_SCCS) && !defined(lint) 38 static char sccsid[] = "@(#)strcasecmp.c 8.1 (Berkeley) 6/4/93"; 39 #endif /* LIBC_SCCS and not lint */ 40 41 typedef unsigned char u_char; 42 43 /* 44 * This array is designed for mapping upper and lower case letter 45 * together for a case independent comparison. The mappings are 46 * based upon ascii character sequences. 47 */ 48 static const u_char charmap[] = { 49 '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007', 50 '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017', 51 '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027', 52 '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037', 53 '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047', 54 '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057', 55 '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067', 56 '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077', 57 '\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147', 58 '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157', 59 '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167', 60 '\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137', 61 '\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147', 62 '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157', 63 '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167', 64 '\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177', 65 '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207', 66 '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217', 67 '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227', 68 '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237', 69 '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247', 70 '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257', 71 '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267', 72 '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277', 73 '\300', '\301', '\302', '\303', '\304', '\305', '\306', '\307', 74 '\310', '\311', '\312', '\313', '\314', '\315', '\316', '\317', 75 '\320', '\321', '\322', '\323', '\324', '\325', '\326', '\327', 76 '\330', '\331', '\332', '\333', '\334', '\335', '\336', '\337', 77 '\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347', 78 '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357', 79 '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367', 80 '\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377', 81 }; 82 83 int 84 strcasecmp(s1, s2) 85 const char *s1, *s2; 86 { 87 register const u_char *cm = charmap, 88 *us1 = (const u_char *)s1, 89 *us2 = (const u_char *)s2; 90 91 while (cm[*us1] == cm[*us2++]) 92 if (*us1++ == '\0') 93 return (0); 94 return (cm[*us1] - cm[*--us2]); 95 } 96 97 int 98 strncasecmp(s1, s2, n) 99 const char *s1, *s2; 100 register size_t n; 101 { 102 if (n != 0) { 103 register const u_char *cm = charmap, 104 *us1 = (const u_char *)s1, 105 *us2 = (const u_char *)s2; 106 107 do { 108 if (cm[*us1] != cm[*us2++]) 109 return (cm[*us1] - cm[*--us2]); 110 if (*us1++ == '\0') 111 break; 112 } while (--n != 0); 113 } 114 return (0); 115 } 116