xref: /titanic_52/usr/src/lib/libresolv2/common/bsd/strcasecmp.c (revision 9525b14bcdeb5b5f6f95ab27c2f48f18bd2ec829)

#if defined(LIBC_SCCS) && !defined(lint)
static const char sccsid[] = "@(#)strcasecmp.c	8.1 (Berkeley) 6/4/93";
static const char rcsid[] = "$Id: strcasecmp.c,v 1.2 2005/04/27 04:56:12 sra Exp $";
#endif /* LIBC_SCCS and not lint */

/*
 * Copyright (c) 1987, 1993
 *    The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 * 	This product includes software developed by the University of
 * 	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "port_before.h"

#include <sys/param.h>
#include <sys/types.h>
#include <sys/cdefs.h>

#include <string.h>

#include "port_after.h"

#ifndef NEED_STRCASECMP
int __strcasecmp_unneeded__;
#else

/*%
 * 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 u_char charmap[] = {
	0000, 0001, 0002, 0003, 0004, 0005, 0006, 0007,
	0010, 0011, 0012, 0013, 0014, 0015, 0016, 0017,
	0020, 0021, 0022, 0023, 0024, 0025, 0026, 0027,
	0030, 0031, 0032, 0033, 0034, 0035, 0036, 0037,
	0040, 0041, 0042, 0043, 0044, 0045, 0046, 0047,
	0050, 0051, 0052, 0053, 0054, 0055, 0056, 0057,
	0060, 0061, 0062, 0063, 0064, 0065, 0066, 0067,
	0070, 0071, 0072, 0073, 0074, 0075, 0076, 0077,
	0100, 0141, 0142, 0143, 0144, 0145, 0146, 0147,
	0150, 0151, 0152, 0153, 0154, 0155, 0156, 0157,
	0160, 0161, 0162, 0163, 0164, 0165, 0166, 0167,
	0170, 0171, 0172, 0133, 0134, 0135, 0136, 0137,
	0140, 0141, 0142, 0143, 0144, 0145, 0146, 0147,
	0150, 0151, 0152, 0153, 0154, 0155, 0156, 0157,
	0160, 0161, 0162, 0163, 0164, 0165, 0166, 0167,
	0170, 0171, 0172, 0173, 0174, 0175, 0176, 0177,
	0200, 0201, 0202, 0203, 0204, 0205, 0206, 0207,
	0210, 0211, 0212, 0213, 0214, 0215, 0216, 0217,
	0220, 0221, 0222, 0223, 0224, 0225, 0226, 0227,
	0230, 0231, 0232, 0233, 0234, 0235, 0236, 0237,
	0240, 0241, 0242, 0243, 0244, 0245, 0246, 0247,
	0250, 0251, 0252, 0253, 0254, 0255, 0256, 0257,
	0260, 0261, 0262, 0263, 0264, 0265, 0266, 0267,
	0270, 0271, 0272, 0273, 0274, 0275, 0276, 0277,
	0300, 0301, 0302, 0303, 0304, 0305, 0306, 0307,
	0310, 0311, 0312, 0313, 0314, 0315, 0316, 0317,
	0320, 0321, 0322, 0323, 0324, 0325, 0326, 0327,
	0330, 0331, 0332, 0333, 0334, 0335, 0336, 0337,
	0340, 0341, 0342, 0343, 0344, 0345, 0346, 0347,
	0350, 0351, 0352, 0353, 0354, 0355, 0356, 0357,
	0360, 0361, 0362, 0363, 0364, 0365, 0366, 0367,
	0370, 0371, 0372, 0373, 0374, 0375, 0376, 0377
};

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

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

int
strncasecmp(const char *s1, const char *s2, size_t n) {
	if (n != 0) {
		const u_char *cm = charmap,
			     *us1 = (const u_char *)s1,
			     *us2 = (const u_char *)s2;

		do {
			if (cm[*us1] != cm[*us2++])
				return (cm[*us1] - cm[*--us2]);
			if (*us1++ == '\0')
				break;
		} while (--n != 0);
	}
	return (0);
}

#endif /*NEED_STRCASECMP*/

/*! \file */