4 * Source code for the "strncasecmp" library routine.
6 * Copyright (c) 1988-1993 The Regents of the University of California.
7 * Copyright (c) 1995-1996 Sun Microsystems, Inc.
9 * See the file "license.terms" for information on usage and redistribution of
10 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
16 * This array is designed for mapping upper and lower case letter together for
17 * a case independent comparison. The mappings are based upon ASCII character
21 static const unsigned char charmap[] = {
22 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
23 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
24 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
25 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
26 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
27 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
28 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
29 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
30 0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
31 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
32 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
33 0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
34 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
35 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
36 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
37 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
38 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
39 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
40 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
41 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
42 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
43 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
44 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,
45 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
46 0xc0, 0xe1, 0xe2, 0xe3, 0xe4, 0xc5, 0xe6, 0xe7,
47 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
48 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
49 0xf8, 0xf9, 0xfa, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
50 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
51 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
52 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
53 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff,
57 * Here are the prototypes just in case they are not included in tclPort.h.
60 int strncasecmp(const char *s1, const char *s2, size_t n);
61 int strcasecmp(const char *s1, const char *s2);
64 *----------------------------------------------------------------------
68 * Compares two strings, ignoring case differences.
71 * Compares two null-terminated strings s1 and s2, returning -1, 0, or 1
72 * if s1 is lexicographically less than, equal to, or greater than s2.
77 *----------------------------------------------------------------------
82 const char *s1, /* First string. */
83 const char *s2) /* Second string. */
87 for ( ; ; s1++, s2++) {
88 u1 = (unsigned char) *s1;
89 u2 = (unsigned char) *s2;
90 if ((u1 == '\0') || (charmap[u1] != charmap[u2])) {
94 return charmap[u1] - charmap[u2];
98 *----------------------------------------------------------------------
102 * Compares two strings, ignoring case differences.
105 * Compares up to length chars of s1 and s2, returning -1, 0, or 1 if s1
106 * is lexicographically less than, equal to, or greater than s2 over
112 *----------------------------------------------------------------------
117 const char *s1, /* First string. */
118 const char *s2, /* Second string. */
119 size_t length) /* Maximum number of characters to compare
120 * (stop earlier if the end of either string
123 unsigned char u1, u2;
125 for (; length != 0; length--, s1++, s2++) {
126 u1 = (unsigned char) *s1;
127 u2 = (unsigned char) *s2;
128 if (charmap[u1] != charmap[u2]) {
129 return charmap[u1] - charmap[u2];