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Fix bug in like terms collection in expression simplification Like term collection would lose the actual "variable" part of the term if the second term collected happened to have no coefficient. This would cause the expression to take the value of the calculated coefficient which is obviously wrong. Thanks to hider <stego@satx.rr.com> for reporting the bug and providing a proper test case. Observation: this bug has been present since the first pre-release of lwtools 3.0 when the algebraic expression system was introduced. Apparently people tend not to create expressions that trigger the like terms handler. The specific conditions require the symbol to be undefined and the second operand to the addition has to have no coefficient so it's likely a fairly rare scenario. Still, it is somewhat surprising that nobody tripped on it before now.
author William Astle <lost@l-w.ca>
date Mon, 23 Jan 2017 22:58:36 -0700
parents e34c8bd6ea29
children b138b4005125
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0
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1 /*
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2 main.c
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3 Copyright © 2009 William Astle
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4
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5 This file is part of LWAR.
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6
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7 LWAR is free software: you can redistribute it and/or modify it under the
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8 terms of the GNU General Public License as published by the Free Software
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9 Foundation, either version 3 of the License, or (at your option) any later
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10 version.
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11
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12 This program is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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15 more details.
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16
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17 You should have received a copy of the GNU General Public License along with
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18 this program. If not, see <http://www.gnu.org/licenses/>.
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21 Implements the program startup code
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23 */
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24
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25 #include <errno.h>
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26 #include <stdio.h>
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27 #include <stdlib.h>
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28 #include <sys/types.h>
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29 #include <sys/stat.h>
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30
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31 #include <lw_cmdline.h>
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32 #include <lw_version.h>
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34 #include "lwar.h"
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35
386
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36 #ifdef _MSC_VER
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37 #include <lw_win.h> // windows build
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38 #else
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39 #include <unistd.h>
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40 #endif
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41
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42 // command line option handling
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43 #define PROGVER "lwar from " PACKAGE_STRING
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44 char *program_name;
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45
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46 static int parse_opts(int key, char *arg, void *state)
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47 {
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48 switch (key)
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49 {
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50 case 'd':
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51 // debug
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52 debug_level++;
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53 break;
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54
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55 case 'n':
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56 // filename only, no path
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57 filename_flag++;
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58 break;
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59
0
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60 case 'a':
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61 // add members
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62 operation = LWAR_OP_ADD;
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63 break;
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64
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65 case 'c':
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66 // create archive
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67 operation = LWAR_OP_CREATE;
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68 break;
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69
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70 case 'm':
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71 mergeflag = 1;
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72 break;
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73
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74 case 'r':
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75 // replace members
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76 operation = LWAR_OP_REPLACE;
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77 break;
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78
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79 case 'l':
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80 // list members
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81 operation = LWAR_OP_LIST;
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82 break;
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83
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84 case 'x':
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85 // extract members
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86 operation = LWAR_OP_EXTRACT;
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87 break;
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88
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89 case lw_cmdline_key_arg:
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90 if (archive_file)
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91 {
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92 // add archive member to list
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93 add_file_name(arg);
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94 }
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95 else
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96 archive_file = arg;
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97 break;
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98
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99 default:
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100 return lw_cmdline_err_unknown;
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101 }
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102 return 0;
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103 }
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104
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105 static struct lw_cmdline_options options[] =
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106 {
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107 { "replace", 'r', 0, 0,
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108 "Add or replace archive members" },
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109 { "extract", 'x', 0, 0,
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110 "Extract members from the archive" },
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111 { "add", 'a', 0, 0,
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112 "Add members to the archive" },
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113 { "list", 'l', 0, 0,
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114 "List the contents of the archive" },
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115 { "create", 'c', 0, 0,
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116 "Create new archive (or truncate existing one)" },
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117 { "merge", 'm', 0, 0,
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118 "Add the contents of archive arguments instead of the archives themselves" },
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119 { "nopaths", 'n', 0, 0,
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120 "Store only the filename when adding members and ignore the path, if any, when extracting members" },
0
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121 { "debug", 'd', 0, 0,
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122 "Set debug mode"},
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123 { 0 }
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124 };
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125
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126 static struct lw_cmdline_parser argparser =
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127 {
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128 options,
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129 parse_opts,
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130 "ARCHIVE [FILE ...]",
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131 "lwar, a library file manager for lwlink",
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132 PROGVER
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133 };
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134
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135 extern void do_list(void);
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136 extern void do_add(void);
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137 extern void do_remove(void);
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138 extern void do_replace(void);
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139 extern void do_extract(void);
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140
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141 // main function; parse command line, set up assembler state, and run the
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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142 // assembler on the first file
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143 int main(int argc, char **argv)
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144 {
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145 program_name = argv[0];
9
6eed14cccac9 Switched lwar to lw_cmdline and brought in lwlib
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146 lw_cmdline_parse(&argparser, argc, argv, 0, 0, NULL);
0
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147 if (archive_file == NULL)
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148 {
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149 fprintf(stderr, "You must specify an archive file.\n");
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150 exit(1);
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151 }
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152
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153 if (operation == 0)
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154 {
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155 fprintf(stderr, "You must specify an operation.\n");
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156 exit(1);
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157 }
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158
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159 if (operation == LWAR_OP_LIST || operation == LWAR_OP_REMOVE || operation == LWAR_OP_EXTRACT)
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160 {
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161 struct stat stbuf;
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162 // make sure the archive exists
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163 if (stat(archive_file, &stbuf) < 0)
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164 {
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165 fprintf(stderr, "Cannot open archive file %s:\n", archive_file);
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166 perror("");
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167 exit(2);
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168 }
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169 }
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170 if (operation == LWAR_OP_CREATE)
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171 {
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172 struct stat stbuf;
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173 // check if the archive exists
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174 if (stat(archive_file, &stbuf) < 0)
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175 {
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176 if (errno != ENOENT)
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177 {
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178 fprintf(stderr, "Cannot create archive file %s:\n", archive_file);
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179 perror("");
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180 exit(2);
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181 }
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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182 }
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183 else
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184 {
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185 if (unlink(archive_file) < 0)
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186 {
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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187 fprintf(stderr, "Cannot create archive file %s:\n", archive_file);
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188 perror("");
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189 exit(2);
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190 }
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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191
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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192 }
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193 }
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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194
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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195 switch (operation)
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196 {
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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197 case LWAR_OP_LIST:
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198 do_list();
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199 break;
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200
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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201 case LWAR_OP_ADD:
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202 case LWAR_OP_CREATE:
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203 do_add();
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204 break;
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205
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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206 case LWAR_OP_REMOVE:
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207 do_remove();
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208 break;
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209
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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210 case LWAR_OP_REPLACE:
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211 do_replace();
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212 break;
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213
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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214 case LWAR_OP_EXTRACT:
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215 do_extract();
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216 break;
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217 }
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218
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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219 exit(0);
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220 }