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/*

 * 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.

 */

/*

@deftypefn Supplemental int strncasecmp (const char *@var{s1}, const char *@var{s2})

A case-insensitive @code{strncmp}.

@end deftypefn

*/

#if defined(LIBC_SCCS) && !defined(lint)

static char sccsid[] = "@(#)strcasecmp.c        5.5 (Berkeley) 11/24/87";

#endif /* LIBC_SCCS and not lint */

#include <ansidecl.h>

#include <stddef.h>

/*

 * This array is designed for mapping upper and lower case letter

 * together for a case independent comparison.  The mappings are

 * based upon ascii character sequences.

 */

static const 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

strncasecmp(const char *s1, const char *s2, register size_t n)

{

    register unsigned char u1, u2;

    for (; n != 0; --n) {

        u1 = (unsigned char) *s1++;

        u2 = (unsigned char) *s2++;

        if (charmap[u1] != charmap[u2]) {

            return charmap[u1] - charmap[u2];

        }

        if (u1 == '\0') {

            return 0;

        }

    }

    return 0;

}