File: strncasecmp.c

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/* strcasecmp.c -- case insensitive string comparator
   Copyright (C) 1998, 1999 Free Software Foundation, Inc.
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.
 
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
 
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software Foundation,
   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */

#if HAVE_CONFIG_H
# include <config.h>
#endif

#define LENGTH_LIMIT

#ifdef LENGTH_LIMIT
# define STRXCASECMP_FUNCTION strncasecmp
# define STRXCASECMP_DECLARE_N , size_t n
# define LENGTH_LIMIT_EXPR(Expr) Expr
#else
# define STRXCASECMP_FUNCTION strcasecmp
# define STRXCASECMP_DECLARE_N /* empty */
# define LENGTH_LIMIT_EXPR(Expr) 0
#endif

#include <stddef.h>
#include <ctype.h>

#define TOLOWER(Ch) (isupper (Ch) ? tolower (Ch) : (Ch))

/* Compare {{no more than N characters of }}strings S1 and S2,
   ignoring case, returning less than, equal to or
   greater than zero if S1 is lexicographically less
   than, equal to or greater than S2.  */

int
STRXCASECMP_FUNCTION (const char *s1, const char *s2 STRXCASECMP_DECLARE_N)
{
    register const unsigned char *p1 = (const unsigned char *) s1;
    register const unsigned char *p2 = (const unsigned char *) s2;
    unsigned char c1, c2;

    if (p1 == p2 || LENGTH_LIMIT_EXPR (n == 0))
        return 0;

    do
    {
        c1 = TOLOWER (*p1);
        c2 = TOLOWER (*p2);

        if (LENGTH_LIMIT_EXPR (--n == 0) || c1 == '\0')
            break;

        ++p1;
        ++p2;
    }
    while (c1 == c2);

    return c1 - c2;
}