1 /*
2 * Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers.
3 * All rights reserved.
4 * Copyright (c) 1983, 1995-1997 Eric P. Allman. All rights reserved.
5 * Copyright (c) 1987, 1988, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * By using this file, you agree to the terms and conditions set
9 * forth in the LICENSE file which can be found at the top level of
10 * the sendmail distribution.
11 *
12 */
13
14 #pragma ident "%Z%%M% %I% %E% SMI"
15
16 #include <sm/gen.h>
17 SM_RCSID("@(#)$Id: strcasecmp.c,v 1.12 2001/08/27 22:09:15 gshapiro Exp $")
18
19 #include <sm/config.h>
20 #include <sm/string.h>
21 #include <string.h>
22
23 /*
24 ** SM_STRCASECMP -- 8-bit clean version of strcasecmp
25 **
26 ** Thank you, vendors, for making this all necessary.
27 */
28
29 /*
30 ** This array is designed for mapping upper and lower case letter
31 ** together for a case independent comparison. The mappings are
32 ** based upon ascii character sequences.
33 */
34
35 const unsigned char charmap[] =
36 {
37 0000, 0001, 0002, 0003, 0004, 0005, 0006, 0007,
38 0010, 0011, 0012, 0013, 0014, 0015, 0016, 0017,
39 0020, 0021, 0022, 0023, 0024, 0025, 0026, 0027,
40 0030, 0031, 0032, 0033, 0034, 0035, 0036, 0037,
41 0040, 0041, 0042, 0043, 0044, 0045, 0046, 0047,
42 0050, 0051, 0052, 0053, 0054, 0055, 0056, 0057,
43 0060, 0061, 0062, 0063, 0064, 0065, 0066, 0067,
44 0070, 0071, 0072, 0073, 0074, 0075, 0076, 0077,
45 0100, 0141, 0142, 0143, 0144, 0145, 0146, 0147,
46 0150, 0151, 0152, 0153, 0154, 0155, 0156, 0157,
47 0160, 0161, 0162, 0163, 0164, 0165, 0166, 0167,
48 0170, 0171, 0172, 0133, 0134, 0135, 0136, 0137,
49 0140, 0141, 0142, 0143, 0144, 0145, 0146, 0147,
50 0150, 0151, 0152, 0153, 0154, 0155, 0156, 0157,
51 0160, 0161, 0162, 0163, 0164, 0165, 0166, 0167,
52 0170, 0171, 0172, 0173, 0174, 0175, 0176, 0177,
53 0200, 0201, 0202, 0203, 0204, 0205, 0206, 0207,
54 0210, 0211, 0212, 0213, 0214, 0215, 0216, 0217,
55 0220, 0221, 0222, 0223, 0224, 0225, 0226, 0227,
56 0230, 0231, 0232, 0233, 0234, 0235, 0236, 0237,
57 0240, 0241, 0242, 0243, 0244, 0245, 0246, 0247,
58 0250, 0251, 0252, 0253, 0254, 0255, 0256, 0257,
59 0260, 0261, 0262, 0263, 0264, 0265, 0266, 0267,
60 0270, 0271, 0272, 0273, 0274, 0275, 0276, 0277,
61 0300, 0301, 0302, 0303, 0304, 0305, 0306, 0307,
62 0310, 0311, 0312, 0313, 0314, 0315, 0316, 0317,
63 0320, 0321, 0322, 0323, 0324, 0325, 0326, 0327,
64 0330, 0331, 0332, 0333, 0334, 0335, 0336, 0337,
65 0340, 0341, 0342, 0343, 0344, 0345, 0346, 0347,
66 0350, 0351, 0352, 0353, 0354, 0355, 0356, 0357,
67 0360, 0361, 0362, 0363, 0364, 0365, 0366, 0367,
68 0370, 0371, 0372, 0373, 0374, 0375, 0376, 0377,
69 };
70
71 int
72 sm_strcasecmp(s1, s2)
73 const char *s1, *s2;
74 {
75 const unsigned char *us1 = (const unsigned char *)s1;
76 const unsigned char *us2 = (const unsigned char *)s2;
77
78 while (charmap[*us1] == charmap[*us2])
79 {
80 if (*us1 == '\0')
81 return 0;
82 ++us1;
83 ++us2;
84 }
85 return charmap[*us1] - charmap[*us2];
86 }
87
88 int
89 sm_strncasecmp(s1, s2, n)
90 const char *s1, *s2;
91 register size_t n;
92 {
93 if (n != 0)
94 {
95 register const unsigned char *cm = charmap;
96 register const unsigned char *us1 = (const unsigned char *)s1;
97 register const unsigned char *us2 = (const unsigned char *)s2;
98
99 do
100 {
101 if (cm[*us1] != cm[*us2++])
102 return (cm[*us1] - cm[*--us2]);
103 if (*us1++ == '\0')
104 break;
105 } while (--n != 0);
106 }
107 return 0;
108 }