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23 results

strcasecmp.c

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  • strcasecmp.c 3.31 KiB
    /* $Id: strcasecmp.c,v 1.1 2002/07/18 04:13:59 momjian Exp $ */
    
    /*
     * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
     * Portions Copyright (c) 1987 Regents of the University of California.
     * All rights reserved.
     *
     * Redistribution and use in source and binary forms are permitted
     * provided that this notice is preserved and that due credit is given
     * to the University of California at Berkeley. The name of the University
     * may not be used to endorse or promote products derived from this
     * software without specific written prior permission. This software
     * is provided ``as is'' without express or implied warranty.
     */
    
    #if defined(LIBC_SCCS) && !defined(lint)
    static char sccsid[] = "@(#)strcasecmp.c	5.5 (Berkeley) 11/24/87";
    #endif   /* LIBC_SCCS and not lint */
    
    #include <sys/types.h>
    #include <string.h>
    
    /*
     * This array is designed for mapping upper and lower case letter
     * together for a case independent comparison.	The mappings are
    p * based upon ascii character sequences.
     */
    static unsigned char charmap[] = {
    	'\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007',
    	'\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017',
    	'\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027',
    	'\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037',
    	'\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047',
    	'\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057',
    	'\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067',
    	'\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077',
    	'\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
    	'\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
    	'\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
    	'\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137',
    	'\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
    	'\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
    	'\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
    	'\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177',
    	'\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207',
    	'\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217',
    	'\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227',
    	'\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237',
    	'\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247',
    	'\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257',
    	'\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267',
    	'\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277',
    	'\300', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
    	'\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
    	'\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
    	'\370', '\371', '\372', '\333', '\334', '\335', '\336', '\337',
    	'\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
    	'\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
    	'\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
    	'\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377',
    };
    
    int
    strcasecmp(char *s1, char *s2)
    {
    	unsigned char u1,
    				u2;
    
    	for (;;)
    	{
    		u1 = (unsigned char) *s1++;
    		u2 = (unsigned char) *s2++;
    		if (charmap[u1] != charmap[u2])
    			return charmap[u1] - charmap[u2];
    		if (u1 == '\0')
    			return 0;
    	}
    }