[25] | 1 | /* |
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| 2 | * strncasecmp.c -- |
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| 3 | * |
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| 4 | * Source code for the "strncasecmp" library routine. |
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| 5 | * |
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| 6 | * Copyright (c) 1988-1993 The Regents of the University of California. |
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| 7 | * Copyright (c) 1995-1996 Sun Microsystems, Inc. |
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| 8 | * |
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| 9 | * See the file "license.terms" for information on usage and redistribution of |
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| 10 | * this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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| 11 | * |
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| 12 | * RCS: @(#) $Id: strncasecmp.c,v 1.3 2007/04/16 13:36:34 dkf Exp $ |
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| 13 | */ |
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| 14 | |
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| 15 | #include "tclPort.h" |
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| 16 | |
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| 17 | /* |
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| 18 | * This array is designed for mapping upper and lower case letter together for |
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| 19 | * a case independent comparison. The mappings are based upon ASCII character |
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| 20 | * sequences. |
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| 21 | */ |
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| 22 | |
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| 23 | static unsigned char charmap[] = { |
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| 24 | 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, |
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| 25 | 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, |
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| 26 | 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, |
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| 27 | 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, |
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| 28 | 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, |
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| 29 | 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, |
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| 30 | 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, |
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| 31 | 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, |
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| 32 | 0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, |
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| 33 | 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, |
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| 34 | 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, |
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| 35 | 0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, |
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| 36 | 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, |
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| 37 | 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, |
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| 38 | 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, |
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| 39 | 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, |
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| 40 | 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, |
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| 41 | 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, |
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| 42 | 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, |
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| 43 | 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, |
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| 44 | 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, |
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| 45 | 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, |
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| 46 | 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, |
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| 47 | 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, |
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| 48 | 0xc0, 0xe1, 0xe2, 0xe3, 0xe4, 0xc5, 0xe6, 0xe7, |
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| 49 | 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, |
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| 50 | 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, |
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| 51 | 0xf8, 0xf9, 0xfa, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, |
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| 52 | 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, |
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| 53 | 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, |
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| 54 | 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, |
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| 55 | 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, |
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| 56 | }; |
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| 57 | |
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| 58 | /* |
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| 59 | * Here are the prototypes just in case they are not included in tclPort.h. |
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| 60 | */ |
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| 61 | |
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| 62 | int strncasecmp(CONST char *s1, CONST char *s2, size_t n); |
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| 63 | int strcasecmp(CONST char *s1, CONST char *s2); |
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| 64 | |
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| 65 | /* |
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| 66 | *---------------------------------------------------------------------- |
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| 67 | * |
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| 68 | * strcasecmp -- |
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| 69 | * |
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| 70 | * Compares two strings, ignoring case differences. |
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| 71 | * |
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| 72 | * Results: |
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| 73 | * Compares two null-terminated strings s1 and s2, returning -1, 0, or 1 |
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| 74 | * if s1 is lexicographically less than, equal to, or greater than s2. |
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| 75 | * |
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| 76 | * Side effects: |
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| 77 | * None. |
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| 78 | * |
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| 79 | *---------------------------------------------------------------------- |
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| 80 | */ |
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| 81 | |
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| 82 | int |
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| 83 | strcasecmp( |
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| 84 | CONST char *s1, /* First string. */ |
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| 85 | CONST char *s2) /* Second string. */ |
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| 86 | { |
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| 87 | unsigned char u1, u2; |
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| 88 | |
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| 89 | for ( ; ; s1++, s2++) { |
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| 90 | u1 = (unsigned char) *s1; |
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| 91 | u2 = (unsigned char) *s2; |
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| 92 | if ((u1 == '\0') || (charmap[u1] != charmap[u2])) { |
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| 93 | break; |
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| 94 | } |
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| 95 | } |
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| 96 | return charmap[u1] - charmap[u2]; |
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| 97 | } |
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| 98 | |
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| 99 | /* |
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| 100 | *---------------------------------------------------------------------- |
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| 101 | * |
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| 102 | * strncasecmp -- |
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| 103 | * |
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| 104 | * Compares two strings, ignoring case differences. |
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| 105 | * |
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| 106 | * Results: |
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| 107 | * Compares up to length chars of s1 and s2, returning -1, 0, or 1 if s1 |
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| 108 | * is lexicographically less than, equal to, or greater than s2 over |
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| 109 | * those characters. |
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| 110 | * |
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| 111 | * Side effects: |
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| 112 | * None. |
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| 113 | * |
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| 114 | *---------------------------------------------------------------------- |
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| 115 | */ |
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| 116 | |
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| 117 | int |
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| 118 | strncasecmp( |
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| 119 | CONST char *s1, /* First string. */ |
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| 120 | CONST char *s2, /* Second string. */ |
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| 121 | size_t length) /* Maximum number of characters to compare |
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| 122 | * (stop earlier if the end of either string |
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| 123 | * is reached). */ |
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| 124 | { |
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| 125 | unsigned char u1, u2; |
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| 126 | |
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| 127 | for (; length != 0; length--, s1++, s2++) { |
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| 128 | u1 = (unsigned char) *s1; |
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| 129 | u2 = (unsigned char) *s2; |
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| 130 | if (charmap[u1] != charmap[u2]) { |
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| 131 | return charmap[u1] - charmap[u2]; |
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| 132 | } |
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| 133 | if (u1 == '\0') { |
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| 134 | return 0; |
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| 135 | } |
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| 136 | } |
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| 137 | return 0; |
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| 138 | } |
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