strcasecmp.c revision 218822
1189832Spjd/* 2189832Spjd * Copyright (c) 1987 Regents of the University of California. 3189832Spjd * All rights reserved. 4189832Spjd * 5189832Spjd * Redistribution and use in source and binary forms are permitted 6189832Spjd * provided that this notice is preserved and that due credit is given 7189832Spjd * to the University of California at Berkeley. The name of the University 8189832Spjd * may not be used to endorse or promote products derived from this 9189832Spjd * software without specific written prior permission. This software 10189832Spjd * is provided ``as is'' without express or implied warranty. 11189832Spjd */ 12189832Spjd 13189832Spjd/* 14189832Spjd 15189832Spjd@deftypefn Supplemental int strcasecmp (const char *@var{s1}, const char *@var{s2}) 16189832Spjd 17189832SpjdA case-insensitive @code{strcmp}. 18189832Spjd 19189832Spjd@end deftypefn 20189832Spjd 21189832Spjd*/ 22189832Spjd 23189832Spjd#if defined(LIBC_SCCS) && !defined(lint) 24189832Spjdstatic char sccsid[] = "@(#)strcasecmp.c 5.5 (Berkeley) 11/24/87"; 25189832Spjd#endif /* LIBC_SCCS and not lint */ 26189832Spjd 27189832Spjd#include <ansidecl.h> 28189832Spjd#include <stddef.h> 29189832Spjd 30189832Spjd/* 31189832Spjd * This array is designed for mapping upper and lower case letter 32189832Spjd * together for a case independent comparison. The mappings are 33189832Spjd * based upon ascii character sequences. 34189832Spjd */ 35189832Spjdtypedef unsigned char uc; 36189832Spjdstatic const unsigned char charmap[] = { 37189832Spjd (uc)'\000',(uc)'\001',(uc)'\002',(uc)'\003',(uc)'\004',(uc)'\005',(uc)'\006',(uc)'\007', 38189832Spjd (uc)'\010',(uc)'\011',(uc)'\012',(uc)'\013',(uc)'\014',(uc)'\015',(uc)'\016',(uc)'\017', 39189832Spjd (uc)'\020',(uc)'\021',(uc)'\022',(uc)'\023',(uc)'\024',(uc)'\025',(uc)'\026',(uc)'\027', 40189832Spjd (uc)'\030',(uc)'\031',(uc)'\032',(uc)'\033',(uc)'\034',(uc)'\035',(uc)'\036',(uc)'\037', 41189832Spjd (uc)'\040',(uc)'\041',(uc)'\042',(uc)'\043',(uc)'\044',(uc)'\045',(uc)'\046',(uc)'\047', 42189832Spjd (uc)'\050',(uc)'\051',(uc)'\052',(uc)'\053',(uc)'\054',(uc)'\055',(uc)'\056',(uc)'\057', 43189832Spjd (uc)'\060',(uc)'\061',(uc)'\062',(uc)'\063',(uc)'\064',(uc)'\065',(uc)'\066',(uc)'\067', 44189832Spjd (uc)'\070',(uc)'\071',(uc)'\072',(uc)'\073',(uc)'\074',(uc)'\075',(uc)'\076',(uc)'\077', 45189832Spjd (uc)'\100',(uc)'\141',(uc)'\142',(uc)'\143',(uc)'\144',(uc)'\145',(uc)'\146',(uc)'\147', 46189832Spjd (uc)'\150',(uc)'\151',(uc)'\152',(uc)'\153',(uc)'\154',(uc)'\155',(uc)'\156',(uc)'\157', 47189832Spjd (uc)'\160',(uc)'\161',(uc)'\162',(uc)'\163',(uc)'\164',(uc)'\165',(uc)'\166',(uc)'\167', 48189832Spjd (uc)'\170',(uc)'\171',(uc)'\172',(uc)'\133',(uc)'\134',(uc)'\135',(uc)'\136',(uc)'\137', 49189832Spjd (uc)'\140',(uc)'\141',(uc)'\142',(uc)'\143',(uc)'\144',(uc)'\145',(uc)'\146',(uc)'\147', 50189832Spjd (uc)'\150',(uc)'\151',(uc)'\152',(uc)'\153',(uc)'\154',(uc)'\155',(uc)'\156',(uc)'\157', 51189832Spjd (uc)'\160',(uc)'\161',(uc)'\162',(uc)'\163',(uc)'\164',(uc)'\165',(uc)'\166',(uc)'\167', 52189832Spjd (uc)'\170',(uc)'\171',(uc)'\172',(uc)'\173',(uc)'\174',(uc)'\175',(uc)'\176',(uc)'\177', 53189832Spjd (uc)'\200',(uc)'\201',(uc)'\202',(uc)'\203',(uc)'\204',(uc)'\205',(uc)'\206',(uc)'\207', 54189832Spjd (uc)'\210',(uc)'\211',(uc)'\212',(uc)'\213',(uc)'\214',(uc)'\215',(uc)'\216',(uc)'\217', 55189832Spjd (uc)'\220',(uc)'\221',(uc)'\222',(uc)'\223',(uc)'\224',(uc)'\225',(uc)'\226',(uc)'\227', 56189832Spjd (uc)'\230',(uc)'\231',(uc)'\232',(uc)'\233',(uc)'\234',(uc)'\235',(uc)'\236',(uc)'\237', 57189832Spjd (uc)'\240',(uc)'\241',(uc)'\242',(uc)'\243',(uc)'\244',(uc)'\245',(uc)'\246',(uc)'\247', 58189832Spjd (uc)'\250',(uc)'\251',(uc)'\252',(uc)'\253',(uc)'\254',(uc)'\255',(uc)'\256',(uc)'\257', 59189832Spjd (uc)'\260',(uc)'\261',(uc)'\262',(uc)'\263',(uc)'\264',(uc)'\265',(uc)'\266',(uc)'\267', 60189832Spjd (uc)'\270',(uc)'\271',(uc)'\272',(uc)'\273',(uc)'\274',(uc)'\275',(uc)'\276',(uc)'\277', 61189832Spjd (uc)'\300',(uc)'\341',(uc)'\342',(uc)'\343',(uc)'\344',(uc)'\345',(uc)'\346',(uc)'\347', 62189832Spjd (uc)'\350',(uc)'\351',(uc)'\352',(uc)'\353',(uc)'\354',(uc)'\355',(uc)'\356',(uc)'\357', 63189832Spjd (uc)'\360',(uc)'\361',(uc)'\362',(uc)'\363',(uc)'\364',(uc)'\365',(uc)'\366',(uc)'\367', 64189832Spjd (uc)'\370',(uc)'\371',(uc)'\372',(uc)'\333',(uc)'\334',(uc)'\335',(uc)'\336',(uc)'\337', 65189832Spjd (uc)'\340',(uc)'\341',(uc)'\342',(uc)'\343',(uc)'\344',(uc)'\345',(uc)'\346',(uc)'\347', 66189832Spjd (uc)'\350',(uc)'\351',(uc)'\352',(uc)'\353',(uc)'\354',(uc)'\355',(uc)'\356',(uc)'\357', 67189832Spjd (uc)'\360',(uc)'\361',(uc)'\362',(uc)'\363',(uc)'\364',(uc)'\365',(uc)'\366',(uc)'\367', 68189832Spjd (uc)'\370',(uc)'\371',(uc)'\372',(uc)'\373',(uc)'\374',(uc)'\375',(uc)'\376',(uc)'\377', 69189832Spjd}; 70189832Spjd 71189832Spjdint 72189832Spjdstrcasecmp(const char *s1, const char *s2) 73189832Spjd{ 74189832Spjd register unsigned char u1, u2; 75189832Spjd 76189832Spjd for (;;) { 77189832Spjd u1 = (unsigned char) *s1++; 78189832Spjd u2 = (unsigned char) *s2++; 79189832Spjd if (charmap[u1] != charmap[u2]) { 80189832Spjd return charmap[u1] - charmap[u2]; 81189832Spjd } 82189832Spjd if (u1 == '\0') { 83189832Spjd return 0; 84189832Spjd } 85189832Spjd } 86189832Spjd} 87189832Spjd 88189832Spjd