annotate src/wildmat.c @ 223:ffb1848a39db noffle

[svn] * src/util.c: Improve (correct) error detection when updating timestamp file. * src/content.h, src/content.c: Return Boolean success/fail from Cont_write. Also ensure cont.first isn't polluted in the event of a failed update. * src/client.c,src/control.c,src/fetch.c,src/noffle.c,src/post.c, src/pseudo.c: If Cont_write fails, don't do actions that need it to have worked. Typically, don't update first and last article numbers in group database. * src/server.c: If groupinfo.lastupdate is unreadable or corrupt, spot this and report it and give an explicit error when processing NNTP NEWGROUPS command.
author bears
date Sun, 09 Dec 2001 12:31:57 +0000
parents 62b9392bceca
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 wildmat.c
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3
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4 Taken from the INN 2.2 distribution and slightly altered to fit the
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5 Noffle environment. Changes are:
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6 o Rename wildmat() to Wld_match().
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7 o Adjust includes.
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8
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9 $Id: wildmat.c 52 2000-05-06 16:53:25Z bears $
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10
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11 The entire INN distribution is covered by the following copyright
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12 notice. As this file originated in the INN distribution is it
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13 subject to the conditions of this notice.
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14
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15 Copyright 1991 Rich Salz.
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16 All rights reserved.
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17 $Revision: 52 $
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18
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19 Redistribution and use in any form are permitted provided that the
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20 following restrictions are are met:
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21 1. Source distributions must retain this entire copyright notice
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22 and comment.
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23 2. Binary distributions must include the acknowledgement ``This
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24 product includes software developed by Rich Salz'' in the
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25 documentation or other materials provided with the
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26 distribution. This must not be represented as an endorsement
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27 or promotion without specific prior written permission.
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28 3. The origin of this software must not be misrepresented, either
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29 by explicit claim or by omission. Credits must appear in the
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30 source and documentation.
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31 4. Altered versions must be plainly marked as such in the source
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32 and documentation and must not be misrepresented as being the
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33 original software.
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34 THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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35 WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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36 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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37
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38 */
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39
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40 /* $Revision: 52 $
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41 **
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42 ** Do shell-style pattern matching for ?, \, [], and * characters.
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43 ** Might not be robust in face of malformed patterns; e.g., "foo[a-"
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44 ** could cause a segmentation violation. It is 8bit clean.
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45 **
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46 ** Written by Rich $alz, mirror!rs, Wed Nov 26 19:03:17 EST 1986.
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47 ** Rich $alz is now <rsalz@osf.org>.
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48 ** April, 1991: Replaced mutually-recursive calls with in-line code
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49 ** for the star character.
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50 **
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51 ** Special thanks to Lars Mathiesen <thorinn@diku.dk> for the ABORT code.
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52 ** This can greatly speed up failing wildcard patterns. For example:
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53 ** pattern: -*-*-*-*-*-*-12-*-*-*-m-*-*-*
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54 ** text 1: -adobe-courier-bold-o-normal--12-120-75-75-m-70-iso8859-1
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55 ** text 2: -adobe-courier-bold-o-normal--12-120-75-75-X-70-iso8859-1
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56 ** Text 1 matches with 51 calls, while text 2 fails with 54 calls. Without
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57 ** the ABORT code, it takes 22310 calls to fail. Ugh. The following
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58 ** explanation is from Lars:
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59 ** The precondition that must be fulfilled is that DoMatch will consume
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60 ** at least one character in text. This is true if *p is neither '*' nor
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61 ** '\0'.) The last return has ABORT instead of FALSE to avoid quadratic
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62 ** behaviour in cases like pattern "*a*b*c*d" with text "abcxxxxx". With
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63 ** FALSE, each star-loop has to run to the end of the text; with ABORT
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64 ** only the last one does.
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65 **
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66 ** Once the control of one instance of DoMatch enters the star-loop, that
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67 ** instance will return either TRUE or ABORT, and any calling instance
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68 ** will therefore return immediately after (without calling recursively
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69 ** again). In effect, only one star-loop is ever active. It would be
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70 ** possible to modify the code to maintain this context explicitly,
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71 ** eliminating all recursive calls at the cost of some complication and
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72 ** loss of clarity (and the ABORT stuff seems to be unclear enough by
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73 ** itself). I think it would be unwise to try to get this into a
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74 ** released version unless you have a good test data base to try it out
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75 ** on.
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76 */
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77 #include <stdio.h>
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78 #include <sys/types.h>
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79 #include "common.h"
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80 #include "log.h"
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81 #include "wildmat.h"
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82
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83 #define ABORT (-1)
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84
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85 /* What character marks an inverted character class? */
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86 #define NEGATE_CLASS '^'
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87 /* Is "*" a common pattern? */
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88 #define OPTIMIZE_JUST_STAR
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89 /* Do tar(1) matching rules, which ignore a trailing slash? */
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90 #undef MATCH_TAR_PATTERN
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91
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92
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93 /*
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94 ** Match text and p, return TRUE, FALSE, or ABORT.
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95 */
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96 static int DoMatch(const char *text, const char *p)
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97 {
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98 int last;
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99 int matched;
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100 int reverse;
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101
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102 for ( ; *p; text++, p++) {
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103 if (*text == '\0' && *p != '*')
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104 return ABORT;
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105 switch (*p) {
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106 case '\\':
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107 /* Literal match with following character. */
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108 p++;
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109 /* FALLTHROUGH */
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110 default:
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111 if (*text != *p)
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112 return FALSE;
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113 continue;
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114 case '?':
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115 /* Match anything. */
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116 continue;
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117 case '*':
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118 while (*++p == '*')
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119 /* Consecutive stars act just like one. */
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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120 continue;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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121 if (*p == '\0')
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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122 /* Trailing star matches everything. */
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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123 return TRUE;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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124 while (*text)
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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125 if ((matched = DoMatch(text++, p)) != FALSE)
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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126 return matched;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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127 return ABORT;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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128 case '[':
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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129 reverse = p[1] == NEGATE_CLASS ? TRUE : FALSE;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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130 if (reverse)
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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131 /* Inverted character class. */
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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132 p++;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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133 matched = FALSE;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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134 if (p[1] == ']' || p[1] == '-')
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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135 if (*++p == *text)
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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136 matched = TRUE;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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137 for (last = *p; *++p && *p != ']'; last = *p)
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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138 /* This next line requires a good C compiler. */
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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139 if (*p == '-' && p[1] != ']'
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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140 ? *text <= *++p && *text >= last : *text == *p)
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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141 matched = TRUE;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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142 if (matched == reverse)
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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143 return FALSE;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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144 continue;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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145 }
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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146 }
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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147
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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148 #ifdef MATCH_TAR_PATTERN
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149 if (*text == '/')
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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150 return TRUE;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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151 #endif /* MATCH_TAR_ATTERN */
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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152 return *text == '\0';
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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153 }
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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154
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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155
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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156 /*
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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157 ** User-level routine. Returns TRUE or FALSE.
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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158 */
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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159 Bool
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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160 Wld_match(const char *text, const char *pattern)
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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161 {
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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162 #ifdef OPTIMIZE_JUST_STAR
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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163 if (pattern[0] == '*' && pattern[1] == '\0')
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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164 return TRUE;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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165 #endif /* OPTIMIZE_JUST_STAR */
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166 return DoMatch(text, pattern) == TRUE;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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167 }
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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168
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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169
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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170
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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171 #if defined(WILDMAT_TEST)
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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172
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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173 /* Yes, we use gets not fgets. Sue me. */
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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174 extern char *gets();
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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175
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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176
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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177 int
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
178 main()
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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179 {
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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180 char p[80];
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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181 char text[80];
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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182
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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183 printf("Wildmat tester. Enter pattern, then strings to test.\n");
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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184 printf("A blank line gets prompts for a new pattern; a blank pattern\n");
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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185 printf("exits the program.\n");
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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186
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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187 for ( ; ; ) {
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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188 printf("\nEnter pattern: ");
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
189 (void)fflush(stdout);
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
190 if (gets(p) == NULL || p[0] == '\0')
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
191 break;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
192 for ( ; ; ) {
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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193 printf("Enter text: ");
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
194 (void)fflush(stdout);
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
195 if (gets(text) == NULL)
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
196 exit(0);
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
197 if (text[0] == '\0')
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
198 /* Blank line; go back and get a new pattern. */
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
199 break;
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
200 printf(" %s\n", Wld_match(text, p) ? "YES" : "NO");
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
201 }
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
202 }
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
203
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
204 exit(0);
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
205 /* NOTREACHED */
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
206 }
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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diff changeset
207 #endif /* defined(TEST) */