1985
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1 /*
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2 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 /*
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26 * Class-Path Wildcards
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27 *
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28 * The syntax for wildcards is a single asterisk. The class path
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29 * foo/"*", e.g., loads all jar files in the directory named foo.
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30 * (This requires careful quotation when used in shell scripts.)
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31 *
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32 * Only files whose names end in .jar or .JAR are matched.
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33 * Files whose names end in .zip, or which have a particular
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34 * magic number, regardless of filename extension, are not
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35 * matched.
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36 *
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37 * Files are considered regardless of whether or not they are
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38 * "hidden" in the UNIX sense, i.e., have names beginning with '.'.
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39 *
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40 * A wildcard only matches jar files, not class files in the same
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41 * directory. If you want to load both class files and jar files from
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42 * a single directory foo then you can say foo:foo/"*", or foo/"*":foo
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43 * if you want the jar files to take precedence.
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44 *
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45 * Subdirectories are not searched recursively, i.e., foo/"*" only
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46 * looks for jar files in foo, not in foo/bar, foo/baz, etc.
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47 *
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48 * Expansion of wildcards is done early, prior to the invocation of a
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49 * program's main method, rather than late, during the class-loading
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50 * process itself. Each element of the input class path containing a
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51 * wildcard is replaced by the (possibly empty) sequence of elements
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52 * generated by enumerating the jar files in the named directory. If
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53 * the directory foo contains a.jar, b.jar, and c.jar,
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54 * e.g., then the class path foo/"*" is expanded into
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55 * foo/a.jar:foo/b.jar:foo/c.jar, and that string would be the value
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56 * of the system property java.class.path.
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57 *
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58 * The order in which the jar files in a directory are enumerated in
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59 * the expanded class path is not specified and may vary from platform
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60 * to platform and even from moment to moment on the same machine. A
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61 * well-constructed application should not depend upon any particular
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62 * order. If a specific order is required then the jar files can be
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63 * enumerated explicitly in the class path.
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64 *
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65 * The CLASSPATH environment variable is not treated any differently
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66 * from the -classpath (equiv. -cp) command-line option,
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67 * i.e. wildcards are honored in all these cases.
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68 *
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69 * Class-path wildcards are not honored in the Class-Path jar-manifest
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70 * header.
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71 *
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72 * Class-path wildcards are honored not only by the Java launcher but
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73 * also by most other command-line tools that accept class paths, and
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74 * in particular by javac and javadoc.
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75 *
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76 * Class-path wildcards are not honored in any other kind of path, and
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77 * especially not in the bootstrap class path, which is a mere
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78 * artifact of our implementation and not something that developers
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79 * should use.
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80 *
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81 * Classpath wildcards are only expanded in the Java launcher code,
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82 * supporting the use of wildcards on the command line and in the
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83 * CLASSPATH environment variable. We do not support the use of
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84 * wildcards by applications that embed the JVM.
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85 */
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86
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87 #include <stddef.h>
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88 #include <stdio.h>
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89 #include <stdlib.h>
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90 #include <string.h>
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91 #include <sys/types.h>
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92 #include "java.h" /* Strictly for PATH_SEPARATOR/FILE_SEPARATOR */
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93 #include "jli_util.h"
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94
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95 #ifdef _WIN32
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96 #include <windows.h>
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97 #else /* Unix */
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98 #include <unistd.h>
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99 #include <dirent.h>
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100 #endif /* Unix */
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101
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102 static int
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103 exists(const char* filename)
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104 {
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105 #ifdef _WIN32
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106 return _access(filename, 0) == 0;
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107 #else
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108 return access(filename, F_OK) == 0;
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109 #endif
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110 }
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111
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112 #define NEW_(TYPE) ((TYPE) JLI_MemAlloc(sizeof(struct TYPE##_)))
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113
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114 /*
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115 * Wildcard directory iteration.
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116 * WildcardIterator_for(wildcard) returns an iterator.
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117 * Each call to that iterator's next() method returns the basename
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118 * of an entry in the wildcard's directory. The basename's memory
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119 * belongs to the iterator. The caller is responsible for prepending
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120 * the directory name and file separator, if necessary.
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121 * When done with the iterator, call the close method to clean up.
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122 */
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123 typedef struct WildcardIterator_* WildcardIterator;
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124
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125 #ifdef _WIN32
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126 struct WildcardIterator_
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127 {
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128 HANDLE handle;
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129 char *firstFile; /* Stupid FindFirstFile...FindNextFile */
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130 };
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131
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132 static WildcardIterator
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133 WildcardIterator_for(const char *wildcard)
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134 {
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135 WIN32_FIND_DATA find_data;
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136 WildcardIterator it = NEW_(WildcardIterator);
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137 HANDLE handle = FindFirstFile(wildcard, &find_data);
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138 if (handle == INVALID_HANDLE_VALUE)
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139 return NULL;
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140 it->handle = handle;
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141 it->firstFile = find_data.cFileName;
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142 return it;
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143 }
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144
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145 static char *
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146 WildcardIterator_next(WildcardIterator it)
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147 {
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148 WIN32_FIND_DATA find_data;
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149 if (it->firstFile != NULL) {
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150 char *firstFile = it->firstFile;
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151 it->firstFile = NULL;
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152 return firstFile;
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153 }
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154 return FindNextFile(it->handle, &find_data)
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155 ? find_data.cFileName : NULL;
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156 }
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157
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158 static void
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159 WildcardIterator_close(WildcardIterator it)
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160 {
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161 if (it) {
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162 FindClose(it->handle);
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163 JLI_MemFree(it->firstFile);
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164 JLI_MemFree(it);
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165 }
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166 }
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167
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168 #else /* Unix */
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169 struct WildcardIterator_
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170 {
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171 DIR *dir;
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172 };
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173
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174 static WildcardIterator
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175 WildcardIterator_for(const char *wildcard)
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176 {
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177 DIR *dir;
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178 int wildlen = strlen(wildcard);
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179 if (wildlen < 2) {
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180 dir = opendir(".");
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181 } else {
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182 char *dirname = JLI_StringDup(wildcard);
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183 dirname[wildlen - 1] = '\0';
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184 dir = opendir(dirname);
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185 JLI_MemFree(dirname);
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186 }
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187 if (dir == NULL)
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188 return NULL;
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189 else {
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190 WildcardIterator it = NEW_(WildcardIterator);
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191 it->dir = dir;
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192 return it;
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193 }
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194 }
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195
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196 static char *
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197 WildcardIterator_next(WildcardIterator it)
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198 {
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199 struct dirent* dirp = readdir(it->dir);
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200 return dirp ? dirp->d_name : NULL;
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201 }
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202
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203 static void
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204 WildcardIterator_close(WildcardIterator it)
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205 {
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206 if (it) {
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207 closedir(it->dir);
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208 JLI_MemFree(it);
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209 }
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210 }
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211 #endif /* Unix */
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212
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213 static int
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214 equal(const char *s1, const char *s2)
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215 {
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216 return strcmp(s1, s2) == 0;
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217 }
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218
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219 /*
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220 * FileList ADT - a dynamic list of C filenames
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221 */
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222 struct FileList_
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223 {
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224 char **files;
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225 int size;
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226 int capacity;
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227 };
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228 typedef struct FileList_ *FileList;
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229
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230 static FileList
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231 FileList_new(int capacity)
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232 {
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233 FileList fl = NEW_(FileList);
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234 fl->capacity = capacity;
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235 fl->files = (char **) JLI_MemAlloc(capacity * sizeof(fl->files[0]));
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236 fl->size = 0;
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237 return fl;
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238 }
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239
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240 #ifdef DEBUG_WILDCARD
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241 static void
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242 FileList_print(FileList fl)
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243 {
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244 int i;
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245 putchar('[');
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246 for (i = 0; i < fl->size; i++) {
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247 if (i > 0) printf(", ");
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248 printf("\"%s\"",fl->files[i]);
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249 }
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250 putchar(']');
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251 }
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252 #endif
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253
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254 static void
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255 FileList_free(FileList fl)
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256 {
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257 if (fl) {
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258 if (fl->files) {
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259 int i;
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260 for (i = 0; i < fl->size; i++)
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261 JLI_MemFree(fl->files[i]);
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262 JLI_MemFree(fl->files);
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263 }
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264 JLI_MemFree(fl);
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265 }
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266 }
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267
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268 static void
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269 FileList_ensureCapacity(FileList fl, int capacity)
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270 {
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271 if (fl->capacity < capacity) {
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272 while (fl->capacity < capacity)
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273 fl->capacity *= 2;
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274 fl->files = JLI_MemRealloc(fl->files,
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275 fl->capacity * sizeof(fl->files[0]));
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276 }
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277 }
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278
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279 static void
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280 FileList_add(FileList fl, char *file)
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281 {
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282 FileList_ensureCapacity(fl, fl->size+1);
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283 fl->files[fl->size++] = file;
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284 }
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285
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286 static void
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287 FileList_addSubstring(FileList fl, const char *beg, int len)
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288 {
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289 char *filename = (char *) JLI_MemAlloc(len+1);
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290 memcpy(filename, beg, len);
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291 filename[len] = '\0';
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292 FileList_ensureCapacity(fl, fl->size+1);
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293 fl->files[fl->size++] = filename;
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294 }
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295
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296 static char *
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297 FileList_join(FileList fl, char sep)
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298 {
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299 int i;
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300 int size;
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301 char *path;
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302 char *p;
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303 for (i = 0, size = 1; i < fl->size; i++)
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304 size += strlen(fl->files[i]) + 1;
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305
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306 path = JLI_MemAlloc(size);
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307
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308 for (i = 0, p = path; i < fl->size; i++) {
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309 int len = strlen(fl->files[i]);
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310 if (i > 0) *p++ = sep;
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311 memcpy(p, fl->files[i], len);
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312 p += len;
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313 }
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314 *p = '\0';
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315
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316 return path;
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317 }
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318
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319 static FileList
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320 FileList_split(const char *path, char sep)
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321 {
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322 const char *p, *q;
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323 int len = strlen(path);
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324 int count;
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325 FileList fl;
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326 for (count = 1, p = path; p < path + len; p++)
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327 count += (*p == sep);
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328 fl = FileList_new(count);
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329 for (p = path;;) {
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330 for (q = p; q <= path + len; q++) {
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331 if (*q == sep || *q == '\0') {
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332 FileList_addSubstring(fl, p, q - p);
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333 if (*q == '\0')
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334 return fl;
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335 p = q + 1;
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336 }
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337 }
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338 }
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339 }
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340
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341 static int
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342 isJarFileName(const char *filename)
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343 {
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344 int len = strlen(filename);
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345 return (len >= 4) &&
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346 (filename[len - 4] == '.') &&
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347 (equal(filename + len - 3, "jar") ||
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348 equal(filename + len - 3, "JAR")) &&
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349 /* Paranoia: Maybe filename is "DIR:foo.jar" */
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350 (strchr(filename, PATH_SEPARATOR) == NULL);
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351 }
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352
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353 static char *
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354 wildcardConcat(const char *wildcard, const char *basename)
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355 {
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356 int wildlen = strlen(wildcard);
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357 int baselen = strlen(basename);
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358 char *filename = (char *) JLI_MemAlloc(wildlen + baselen);
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359 /* Replace the trailing '*' with basename */
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360 memcpy(filename, wildcard, wildlen-1);
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361 memcpy(filename+wildlen-1, basename, baselen+1);
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362 return filename;
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363 }
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364
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365 static FileList
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366 wildcardFileList(const char *wildcard)
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367 {
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368 const char *basename;
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369 FileList fl = FileList_new(16);
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370 WildcardIterator it = WildcardIterator_for(wildcard);
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371 if (it == NULL)
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372 return NULL;
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373 while ((basename = WildcardIterator_next(it)) != NULL)
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374 if (isJarFileName(basename))
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375 FileList_add(fl, wildcardConcat(wildcard, basename));
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376 WildcardIterator_close(it);
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377 return fl;
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378 }
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379
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380 static int
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381 isWildcard(const char *filename)
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382 {
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383 int len = strlen(filename);
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384 return (len > 0) &&
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385 (filename[len - 1] == '*') &&
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386 (len == 1 || IS_FILE_SEPARATOR(filename[len - 2])) &&
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387 (! exists(filename));
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388 }
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389
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390 static void
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391 FileList_expandWildcards(FileList fl)
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392 {
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393 int i, j;
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394 for (i = 0; i < fl->size; i++) {
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395 if (isWildcard(fl->files[i])) {
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396 FileList expanded = wildcardFileList(fl->files[i]);
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397 if (expanded != NULL && expanded->size > 0) {
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398 JLI_MemFree(fl->files[i]);
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399 FileList_ensureCapacity(fl, fl->size + expanded->size);
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400 for (j = fl->size - 1; j >= i+1; j--)
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401 fl->files[j+expanded->size-1] = fl->files[j];
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402 for (j = 0; j < expanded->size; j++)
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403 fl->files[i+j] = expanded->files[j];
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404 i += expanded->size - 1;
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405 fl->size += expanded->size - 1;
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406 /* fl expropriates expanded's elements. */
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407 expanded->size = 0;
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408 }
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409 FileList_free(expanded);
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410 }
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411 }
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412 }
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413
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414 const char *
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415 JLI_WildcardExpandClasspath(const char *classpath)
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416 {
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417 char *expanded;
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418 FileList fl;
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419
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420 if (strchr(classpath, '*') == NULL)
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421 return classpath;
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422 fl = FileList_split(classpath, PATH_SEPARATOR);
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423 FileList_expandWildcards(fl);
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424 expanded = FileList_join(fl, PATH_SEPARATOR);
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425 FileList_free(fl);
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426 if (getenv("_JAVA_LAUNCHER_DEBUG") != 0)
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427 printf("Expanded wildcards:\n"
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428 " before: \"%s\"\n"
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429 " after : \"%s\"\n",
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430 classpath, expanded);
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431 return expanded;
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432 }
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433
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434 #ifdef DEBUG_WILDCARD
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435 static void
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436 wildcardExpandArgv(const char ***argv)
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437 {
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438 int i;
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439 for (i = 0; (*argv)[i]; i++) {
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440 if (equal((*argv)[i], "-cp") ||
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441 equal((*argv)[i], "-classpath")) {
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442 i++;
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443 (*argv)[i] = wildcardExpandClasspath((*argv)[i]);
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444 }
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445 }
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446 }
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447
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448 static void
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449 debugPrintArgv(char *argv[])
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450 {
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451 int i;
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452 putchar('[');
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453 for (i = 0; argv[i]; i++) {
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454 if (i > 0) printf(", ");
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455 printf("\"%s\"", argv[i]);
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456 }
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457 printf("]\n");
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458 }
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459
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460 int
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461 main(int argc, char *argv[])
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462 {
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463 argv[0] = "java";
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464 wildcardExpandArgv((const char***)&argv);
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465 debugPrintArgv(argv);
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466 /* execvp("java", argv); */
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467 return 0;
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468 }
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469 #endif /* DEBUG_WILDCARD */
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470
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471 /* Cute little perl prototype implementation....
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472
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473 my $sep = ($^O =~ /^(Windows|cygwin)/) ? ";" : ":";
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474
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475 sub expand($) {
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476 opendir DIR, $_[0] or return $_[0];
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477 join $sep, map {"$_[0]/$_"} grep {/\.(jar|JAR)$/} readdir DIR;
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478 }
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479
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480 sub munge($) {
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481 join $sep,
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482 map {(! -r $_ and s/[\/\\]+\*$//) ? expand $_ : $_} split $sep, $_[0];
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483 }
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484
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485 for (my $i = 0; $i < @ARGV - 1; $i++) {
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486 $ARGV[$i+1] = munge $ARGV[$i+1] if $ARGV[$i] =~ /^-c(p|lasspath)$/;
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487 }
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488
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489 $ENV{CLASSPATH} = munge $ENV{CLASSPATH} if exists $ENV{CLASSPATH};
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490 @ARGV = ("java", @ARGV);
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491 print "@ARGV\n";
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492 exec @ARGV;
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493
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494 */
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