strccmp.c

Netscape NSPR库源码

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 * 
 * The Original Code is the Netscape Portable Runtime (NSPR).
 * 
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation.  Portions created by Netscape are 
 * Copyright (C) 1998-2000 Netscape Communications Corporation.  All
 * Rights Reserved.
 * 
 * Contributor(s):
 * 
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL"), in which case the provisions of the GPL are applicable 
 * instead of those above.  If you wish to allow use of your 
 * version of this file only under the terms of the GPL and not to
 * allow others to use your version of this file under the MPL,
 * indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by
 * the GPL.  If you do not delete the provisions above, a recipient
 * may use your version of this file under either the MPL or the
 * GPL.
 */

#include "plstr.h"

static const unsigned char uc[] =
{
    '\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',
    ' ',    '!',    '"',    '#',    '$',    '%',    '&',    '\'',
    '(',    ')',    '*',    '+',    ',',    '-',    '.',    '/',
    '0',    '1',    '2',    '3',    '4',    '5',    '6',    '7',
    '8',    '9',    ':',    ';',    '<',    '=',    '>',    '?',
    '@',    'A',    'B',    'C',    'D',    'E',    'F',    'G',
    'H',    'I',    'J',    'K',    'L',    'M',    'N',    'O',
    'P',    'Q',    'R',    'S',    'T',    'U',    'V',    'W',
    'X',    'Y',    'Z',    '[',    '\\',   ']',    '^',    '_',
    '`',    'A',    'B',    'C',    'D',    'E',    'F',    'G',
    'H',    'I',    'J',    'K',    'L',    'M',    'N',    'O',
    'P',    'Q',    'R',    'S',    'T',    'U',    'V',    'W',
    'X',    'Y',    'Z',    '{',    '|',    '}',    '~',    '\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', '\301', '\302', '\303', '\304', '\305', '\306', '\307',
    '\310', '\311', '\312', '\313', '\314', '\315', '\316', '\317',
    '\320', '\321', '\322', '\323', '\324', '\325', '\326', '\327',
    '\330', '\331', '\332', '\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'
};

PR_IMPLEMENT(PRIntn)
PL_strcasecmp(const char *a, const char *b)
{
    const unsigned char *ua = (const unsigned char *)a;
    const unsigned char *ub = (const unsigned char *)b;

    if( ((const char *)0 == a) || (const char *)0 == b ) 
        return (PRIntn)(a-b);

    while( (uc[*ua] == uc[*ub]) && ('\0' != *a) )
    {
        a++;
        ua++;
        ub++;
    }

    return (PRIntn)(uc[*ua] - uc[*ub]);
}

PR_IMPLEMENT(PRIntn)
PL_strncasecmp(const char *a, const char *b, PRUint32 max)
{
    const unsigned char *ua = (const unsigned char *)a;
    const unsigned char *ub = (const unsigned char *)b;

    if( ((const char *)0 == a) || (const char *)0 == b ) 
        return (PRIntn)(a-b);

    while( max && (uc[*ua] == uc[*ub]) && ('\0' != *a) )
    {
        a++;
        ua++;
        ub++;
        max--;
    }

    if( 0 == max ) return (PRIntn)0;

    return (PRIntn)(uc[*ua] - uc[*ub]);
}