xref: /original-bsd/lib/libc/string/strcasecmp.c (revision 84bbc80e)
1 /*
2  * Copyright (c) 1987 Regents of the University of California.
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms are permitted
6  * provided that the above copyright notice and this paragraph are
7  * duplicated in all such forms and that any documentation,
8  * advertising materials, and other materials related to such
9  * distribution and use acknowledge that the software was developed
10  * by the University of California, Berkeley.  The name of the
11  * University may not be used to endorse or promote products derived
12  * from this software without specific prior written permission.
13  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
14  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
15  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
16  */
17 
18 #include <sys/stdc.h>
19 #include <string.h>
20 
21 #if defined(LIBC_SCCS) && !defined(lint)
22 static const char sccsid[] = "@(#)strcasecmp.c	5.8 (Berkeley) 05/16/90";
23 #endif /* LIBC_SCCS and not lint */
24 
25 typedef unsigned char u_char;
26 
27 /*
28  * This array is designed for mapping upper and lower case letter
29  * together for a case independent comparison.  The mappings are
30  * based upon ascii character sequences.
31  */
32 static const u_char charmap[] = {
33 	'\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007',
34 	'\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017',
35 	'\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027',
36 	'\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037',
37 	'\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047',
38 	'\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057',
39 	'\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067',
40 	'\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077',
41 	'\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
42 	'\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
43 	'\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
44 	'\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137',
45 	'\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
46 	'\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
47 	'\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
48 	'\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177',
49 	'\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207',
50 	'\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217',
51 	'\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227',
52 	'\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237',
53 	'\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247',
54 	'\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257',
55 	'\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267',
56 	'\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277',
57 	'\300', '\301', '\302', '\303', '\304', '\305', '\306', '\307',
58 	'\310', '\311', '\312', '\313', '\314', '\315', '\316', '\317',
59 	'\320', '\321', '\322', '\323', '\324', '\325', '\326', '\327',
60 	'\330', '\331', '\332', '\333', '\334', '\335', '\336', '\337',
61 	'\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
62 	'\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
63 	'\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
64 	'\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377',
65 };
66 
67 int
68 strcasecmp(s1, s2)
69 	const char *s1, *s2;
70 {
71 	register const u_char *cm = charmap,
72 			*us1 = (const u_char *)s1,
73 			*us2 = (const u_char *)s2;
74 
75 	while (cm[*us1] == cm[*us2++])
76 		if (*us1++ == '\0')
77 			return (0);
78 	return (cm[*us1] - cm[*--us2]);
79 }
80 
81 int
82 strncasecmp(s1, s2, n)
83 	const char *s1, *s2;
84 	register size_t n;
85 {
86 	if (n != 0) {
87 		register const u_char *cm = charmap,
88 				*us1 = (const u_char *)s1,
89 				*us2 = (const u_char *)s2;
90 
91 		do {
92 			if (cm[*us1] != cm[*us2++])
93 				return (cm[*us1] - cm[*--us2]);
94 			if (*us1++ == '\0')
95 				break;
96 		} while (--n != 0);
97 	}
98 	return (0);
99 }
100