annotate src/SDL_getenv.c @ 302:8a86bdf34f0f

Added Atari joystick support (thanks Patrice!)
author Sam Lantinga <slouken@libsdl.org>
date Thu, 07 Mar 2002 20:23:11 +0000
parents f6ffac90895c
children b8d311d90021
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
297
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga
249
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
0
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27
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28 /* Not all environments have a working getenv()/putenv() */
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29
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30 #ifdef TEST_MAIN
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31 #define NEED_SDL_GETENV
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32 #endif
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33
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34 #include "SDL_getenv.h"
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35
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36 #ifdef NEED_SDL_GETENV
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37
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38 #include <stdlib.h>
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39 #include <string.h>
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40
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41 static char **SDL_env = (char **)0;
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42
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43 /* Put a variable of the form "name=value" into the environment */
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44 int SDL_putenv(const char *variable)
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45 {
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46 const char *name, *value;
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47 int added;
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48 int len, i;
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49 char **new_env;
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50 char *new_variable;
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51
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52 /* A little error checking */
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53 if ( ! variable ) {
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54 return(-1);
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55 }
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56 name = variable;
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57 for ( value=variable; *value && (*value != '='); ++value ) {
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58 /* Keep looking for '=' */ ;
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59 }
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60 if ( *value ) {
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61 ++value;
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62 } else {
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63 return(-1);
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64 }
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65
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66 /* Allocate memory for the variable */
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67 new_variable = (char *)malloc(strlen(variable)+1);
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68 if ( ! new_variable ) {
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69 return(-1);
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70 }
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71 strcpy(new_variable, variable);
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72
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73 /* Actually put it into the environment */
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74 added = 0;
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75 i = 0;
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76 if ( SDL_env ) {
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77 /* Check to see if it's already there... */
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78 len = (value - name);
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79 for ( ; SDL_env[i]; ++i ) {
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80 if ( strncmp(SDL_env[i], name, len) == 0 ) {
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81 break;
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82 }
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83 }
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84 /* If we found it, just replace the entry */
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85 if ( SDL_env[i] ) {
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86 free(SDL_env[i]);
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87 SDL_env[i] = new_variable;
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88 added = 1;
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89 }
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90 }
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91
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92 /* Didn't find it in the environment, expand and add */
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93 if ( ! added ) {
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94 new_env = realloc(SDL_env, (i+2)*sizeof(char *));
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95 if ( new_env ) {
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96 SDL_env = new_env;
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97 SDL_env[i++] = new_variable;
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98 SDL_env[i++] = (char *)0;
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99 added = 1;
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100 } else {
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101 free(new_variable);
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102 }
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103 }
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104 return (added ? 0 : -1);
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105 }
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106
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107 /* Retrieve a variable named "name" from the environment */
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108 char *SDL_getenv(const char *name)
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109 {
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110 int len, i;
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111 char *value;
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112
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113 value = (char *)0;
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114 if ( SDL_env ) {
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115 len = strlen(name);
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116 for ( i=0; SDL_env[i] && !value; ++i ) {
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117 if ( (strncmp(SDL_env[i], name, len) == 0) &&
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118 (SDL_env[i][len] == '=') ) {
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119 value = &SDL_env[i][len+1];
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120 }
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121 }
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122 }
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123 return value;
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124 }
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125
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126 #endif /* NEED_GETENV */
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127
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128 #ifdef TEST_MAIN
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129 #include <stdio.h>
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130
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131 int main(int argc, char *argv[])
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132 {
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133 char *value;
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134
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135 printf("Checking for non-existent variable... ");
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136 fflush(stdout);
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137 if ( ! getenv("EXISTS") ) {
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138 printf("okay\n");
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139 } else {
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140 printf("failed\n");
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141 }
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142 printf("Setting FIRST=VALUE1 in the environment... ");
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143 fflush(stdout);
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144 if ( putenv("FIRST=VALUE1") == 0 ) {
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145 printf("okay\n");
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146 } else {
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147 printf("failed\n");
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148 }
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149 printf("Getting FIRST from the environment... ");
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150 fflush(stdout);
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151 value = getenv("FIRST");
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152 if ( value && (strcmp(value, "VALUE1") == 0) ) {
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153 printf("okay\n");
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154 } else {
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155 printf("failed\n");
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156 }
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157 printf("Setting SECOND=VALUE2 in the environment... ");
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158 fflush(stdout);
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159 if ( putenv("SECOND=VALUE2") == 0 ) {
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160 printf("okay\n");
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161 } else {
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162 printf("failed\n");
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163 }
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164 printf("Getting SECOND from the environment... ");
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165 fflush(stdout);
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166 value = getenv("SECOND");
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167 if ( value && (strcmp(value, "VALUE2") == 0) ) {
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168 printf("okay\n");
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169 } else {
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170 printf("failed\n");
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171 }
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172 printf("Setting FIRST=NOVALUE in the environment... ");
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173 fflush(stdout);
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174 if ( putenv("FIRST=NOVALUE") == 0 ) {
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175 printf("okay\n");
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176 } else {
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177 printf("failed\n");
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178 }
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179 printf("Getting FIRST from the environment... ");
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180 fflush(stdout);
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181 value = getenv("FIRST");
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182 if ( value && (strcmp(value, "NOVALUE") == 0) ) {
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183 printf("okay\n");
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184 } else {
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185 printf("failed\n");
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186 }
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187 printf("Checking for non-existent variable... ");
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188 fflush(stdout);
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189 if ( ! getenv("EXISTS") ) {
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190 printf("okay\n");
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191 } else {
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192 printf("failed\n");
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193 }
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194 return(0);
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195 }
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196 #endif /* TEST_MAIN */
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197