xref: /titanic_52/usr/src/cmd/lp/lib/lp/cs_strncmp.c (revision 88447a05f537aabe9a1bc3d5313f22581ec992a7)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
23 /*	  All Rights Reserved  	*/
24 
25 
26 #ident	"%Z%%M%	%I%	%E% SMI"	/* SVr4.0 1.5	*/
27 /* EMACS_MODES: !fill, lnumb, !overwrite, !nodelete, !picture */
28 
29 #include "ctype.h"
30 
31 /*
32  * Compare strings (at most n bytes) ignoring case
33  *	returns: s1>s2; >0  s1==s2; 0  s1<s2; <0
34  */
35 
36 int
37 #if	defined(__STDC__)
38 cs_strncmp(
39 	char *			s1,
40 	char *			s2,
41 	int			n
42 )
43 #else
44 cs_strncmp(s1, s2, n)
45 register char *s1, *s2;
46 register n;
47 #endif
48 {
49 	if(s1 == s2)
50 		return(0);
51 	while(--n >= 0 && toupper(*s1) == toupper(*s2++))
52 		if(*s1++ == '\0')
53 			return(0);
54 	return((n < 0)? 0: (toupper(*s1) - toupper(*--s2)));
55 }
56