Windows2003-3790/inetsrv/iis/svcs/smtp/server/strcscmp.cxx

/*++

Copyright (c) 1991  Microsoft Corporation

Module Name:

    strcscmp.cxx

Abstract:

    This module implements case insensitive string comparison routines.

Author:

    Mike Massa (mikemas)           Sept 20, 1991

Revision History:

    Who         When        What
    --------    --------    ----------------------------------------------
    mikemas     9-20-91     created

Notes:

    Exports:
        None

--*/

#include "smtpinc.h"

#ident "@(#)strcasecmp.c        5.3     3/8/91"

/******************************************************************
 *
 *  SpiderTCP BIND
 *
 *  Copyright 1990  Spider Systems Limited
 *
 *  STRCASECMP.C
 *
 ******************************************************************/

/*
 *       /usr/projects/tcp/SCCS.rel3/rel/src/lib/net/0/s.strcasecmp.c
 *      @(#)strcasecmp.c        5.3
 *
 *      Last delta created      14:12:01 3/4/91
 *      This file extracted     11:20:35 3/8/91
 *
 *      Modifications:
 *
 *              GSS     24 Jul 90       New File
 */
/*
 * Copyright (c) 1987 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)strcasecmp.c        5.7 (Berkeley) 2/7/89";
#endif /* LIBC_SCCS and not lint */
/**************************************************************************/

#include <winsock.h>
//#include "winsockp.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 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', '\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',
};

int
strcasecmp(
    char *s1,
    char *s2
    )
{
        char *cm = charmap;
        unsigned char *us1 = (unsigned char *)s1;
        unsigned char *us2 = (unsigned char *)s2;

        while (cm[*us1] == cm[*us2++])
                if (*us1++ == '\0')
                        return(0);
        return(cm[*us1] - cm[*--us2]);
}

int
strncasecmp(
    char *s1,
    char *s2,
    int   n
    )
{
        char *cm = charmap;
        unsigned char *us1 = (unsigned char *)s1;
        unsigned char *us2 = (unsigned char *)s2;

        while (--n >= 0 && cm[*us1] == cm[*us2++])
                if (*us1++ == '\0')
                        return(0);
        return(n < 0 ? 0 : cm[*us1] - cm[*--us2]);
}