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[/] [openrisc/] [trunk/] [gnu-old/] [binutils-2.18.50/] [libiberty/] [strncasecmp.c] - Blame information for rev 853

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1 38 julius
/*
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 * Copyright (c) 1987 Regents of the University of California.
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms are permitted
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 * provided that this notice is preserved and that due credit is given
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 * to the University of California at Berkeley. The name of the University
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 * may not be used to endorse or promote products derived from this
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 * software without specific written prior permission. This software
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 * is provided ``as is'' without express or implied warranty.
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 */
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/*
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@deftypefn Supplemental int strncasecmp (const char *@var{s1}, const char *@var{s2})
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A case-insensitive @code{strncmp}.
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@end deftypefn
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)strcasecmp.c        5.5 (Berkeley) 11/24/87";
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#endif /* LIBC_SCCS and not lint */
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#include <ansidecl.h>
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#include <stddef.h>
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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 unsigned 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', '\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', '\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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strncasecmp(const char *s1, const char *s2, register size_t n)
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{
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    register unsigned char u1, u2;
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    for (; n != 0; --n) {
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        u1 = (unsigned char) *s1++;
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        u2 = (unsigned char) *s2++;
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        if (charmap[u1] != charmap[u2]) {
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            return charmap[u1] - charmap[u2];
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        }
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        if (u1 == '\0') {
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            return 0;
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        }
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    }
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    return 0;
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}

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