Mercurial > noffle
annotate src/wildmat.c @ 393:e113df4af08b noffle
[svn] added debconf-2.0 dependency option
author | godisch |
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date | Sat, 24 May 2003 07:30:38 +0100 |
parents | 62b9392bceca |
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rev | line source |
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43
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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 |
46 | 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. |
46 | 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 |
46 | 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" |
46 | 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. */ |
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120 continue; |
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121 if (*p == '\0') |
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122 /* Trailing star matches everything. */ |
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123 return TRUE; |
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124 while (*text) |
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125 if ((matched = DoMatch(text++, p)) != FALSE) |
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126 return matched; |
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127 return ABORT; |
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128 case '[': |
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129 reverse = p[1] == NEGATE_CLASS ? TRUE : FALSE; |
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130 if (reverse) |
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131 /* Inverted character class. */ |
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132 p++; |
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133 matched = FALSE; |
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134 if (p[1] == ']' || p[1] == '-') |
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135 if (*++p == *text) |
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136 matched = TRUE; |
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137 for (last = *p; *++p && *p != ']'; last = *p) |
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138 /* This next line requires a good C compiler. */ |
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139 if (*p == '-' && p[1] != ']' |
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140 ? *text <= *++p && *text >= last : *text == *p) |
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141 matched = TRUE; |
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142 if (matched == reverse) |
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143 return FALSE; |
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144 continue; |
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145 } |
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146 } |
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147 |
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148 #ifdef MATCH_TAR_PATTERN |
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149 if (*text == '/') |
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150 return TRUE; |
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151 #endif /* MATCH_TAR_ATTERN */ |
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152 return *text == '\0'; |
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153 } |
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154 |
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155 |
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156 /* |
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157 ** User-level routine. Returns TRUE or FALSE. |
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158 */ |
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159 Bool |
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160 Wld_match(const char *text, const char *pattern) |
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161 { |
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162 #ifdef OPTIMIZE_JUST_STAR |
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163 if (pattern[0] == '*' && pattern[1] == '\0') |
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164 return TRUE; |
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165 #endif /* OPTIMIZE_JUST_STAR */ |
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166 return DoMatch(text, pattern) == TRUE; |
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167 } |
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168 |
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169 |
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170 |
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171 #if defined(WILDMAT_TEST) |
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172 |
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173 /* Yes, we use gets not fgets. Sue me. */ |
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174 extern char *gets(); |
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175 |
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176 |
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177 int |
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178 main() |
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179 { |
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180 char p[80]; |
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181 char text[80]; |
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182 |
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183 printf("Wildmat tester. Enter pattern, then strings to test.\n"); |
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184 printf("A blank line gets prompts for a new pattern; a blank pattern\n"); |
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185 printf("exits the program.\n"); |
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186 |
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187 for ( ; ; ) { |
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188 printf("\nEnter pattern: "); |
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189 (void)fflush(stdout); |
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190 if (gets(p) == NULL || p[0] == '\0') |
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191 break; |
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192 for ( ; ; ) { |
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193 printf("Enter text: "); |
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194 (void)fflush(stdout); |
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195 if (gets(text) == NULL) |
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196 exit(0); |
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197 if (text[0] == '\0') |
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198 /* Blank line; go back and get a new pattern. */ |
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199 break; |
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200 printf(" %s\n", Wld_match(text, p) ? "YES" : "NO"); |
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201 } |
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202 } |
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203 |
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204 exit(0); |
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205 /* NOTREACHED */ |
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206 } |
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207 #endif /* defined(TEST) */ |