Mercurial > sdl-ios-xcode
annotate src/stdlib/SDL_getenv.c @ 1330:450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
using Visual C++ 2005
author | Sam Lantinga <slouken@libsdl.org> |
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date | Mon, 06 Feb 2006 08:28:51 +0000 |
parents | |
children | 1cbaeee565b1 |
rev | line source |
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1330
450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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1 /* |
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It's now possible to build SDL without any C runtime at all on Windows,
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2 SDL - Simple DirectMedia Layer |
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3 Copyright (C) 1997-2006 Sam Lantinga |
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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 Lesser General Public |
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7 License as published by the Free Software Foundation; either |
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8 version 2.1 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 Lesser 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 Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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 #include "SDL_stdlib.h" |
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24 #include "SDL_string.h" |
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25 |
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26 |
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27 #if defined(WIN32) && !defined(_WIN32_WCE) |
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28 |
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29 #include "SDL_windows.h" |
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30 #include "SDL_string.h" |
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31 |
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32 /* Note this isn't thread-safe! */ |
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33 |
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34 static char *SDL_envmem = NULL; /* Ugh, memory leak */ |
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35 static DWORD SDL_envmemlen = 0; |
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36 |
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37 /* Put a variable of the form "name=value" into the environment */ |
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38 int SDL_putenv(const char *variable) |
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39 { |
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40 DWORD bufferlen; |
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41 char *value; |
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42 const char *sep; |
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43 |
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44 sep = strchr(variable, '='); |
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45 if ( sep == NULL ) { |
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46 return -1; |
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47 } |
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48 bufferlen = strlen(variable)+1; |
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49 if ( bufferlen > SDL_envmemlen ) { |
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50 char *newmem = (char *)realloc(SDL_envmem, bufferlen); |
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51 if ( newmem == NULL ) { |
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52 return -1; |
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53 } |
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54 SDL_envmem = newmem; |
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55 SDL_envmemlen = bufferlen; |
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56 } |
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57 strcpy(SDL_envmem, variable); |
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58 value = SDL_envmem + (sep - variable); |
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59 *value++ = '\0'; |
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60 if ( !SetEnvironmentVariable(SDL_envmem, *value ? value : NULL) ) { |
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61 return -1; |
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62 } |
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63 return 0; |
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64 } |
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65 |
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66 /* Retrieve a variable named "name" from the environment */ |
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67 char *SDL_getenv(const char *name) |
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68 { |
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69 DWORD bufferlen; |
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70 |
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71 bufferlen = GetEnvironmentVariable(name, SDL_envmem, SDL_envmemlen); |
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72 if ( bufferlen == 0 ) { |
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73 return NULL; |
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74 } |
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75 if ( bufferlen > SDL_envmemlen ) { |
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76 char *newmem = (char *)realloc(SDL_envmem, bufferlen); |
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77 if ( newmem == NULL ) { |
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78 return NULL; |
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79 } |
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80 SDL_envmem = newmem; |
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81 SDL_envmemlen = bufferlen; |
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82 GetEnvironmentVariable(name, SDL_envmem, SDL_envmemlen); |
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83 } |
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84 return SDL_envmem; |
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85 } |
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86 |
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87 #else /* roll our own */ |
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88 |
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89 static char **SDL_env = (char **)0; |
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90 |
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91 /* Put a variable of the form "name=value" into the environment */ |
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92 int SDL_putenv(const char *variable) |
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93 { |
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94 const char *name, *value; |
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95 int added; |
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96 int len, i; |
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97 char **new_env; |
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98 char *new_variable; |
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99 |
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100 /* A little error checking */ |
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101 if ( ! variable ) { |
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102 return(-1); |
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103 } |
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104 name = variable; |
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105 for ( value=variable; *value && (*value != '='); ++value ) { |
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106 /* Keep looking for '=' */ ; |
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107 } |
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108 if ( *value ) { |
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109 ++value; |
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110 } else { |
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111 return(-1); |
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112 } |
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113 |
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114 /* Allocate memory for the variable */ |
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115 new_variable = (char *)malloc(strlen(variable)+1); |
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116 if ( ! new_variable ) { |
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117 return(-1); |
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118 } |
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119 strcpy(new_variable, variable); |
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120 |
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121 /* Actually put it into the environment */ |
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122 added = 0; |
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123 i = 0; |
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124 if ( SDL_env ) { |
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125 /* Check to see if it's already there... */ |
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126 len = (value - name); |
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127 for ( ; SDL_env[i]; ++i ) { |
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128 if ( strncmp(SDL_env[i], name, len) == 0 ) { |
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129 break; |
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130 } |
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131 } |
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132 /* If we found it, just replace the entry */ |
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133 if ( SDL_env[i] ) { |
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134 free(SDL_env[i]); |
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135 SDL_env[i] = new_variable; |
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136 added = 1; |
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137 } |
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138 } |
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139 |
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140 /* Didn't find it in the environment, expand and add */ |
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141 if ( ! added ) { |
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142 new_env = realloc(SDL_env, (i+2)*sizeof(char *)); |
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143 if ( new_env ) { |
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144 SDL_env = new_env; |
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145 SDL_env[i++] = new_variable; |
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146 SDL_env[i++] = (char *)0; |
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147 added = 1; |
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148 } else { |
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149 free(new_variable); |
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150 } |
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151 } |
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152 return (added ? 0 : -1); |
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153 } |
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154 |
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155 /* Retrieve a variable named "name" from the environment */ |
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156 char *SDL_getenv(const char *name) |
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157 { |
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158 int len, i; |
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159 char *value; |
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160 |
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161 value = (char *)0; |
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162 if ( SDL_env ) { |
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163 len = strlen(name); |
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164 for ( i=0; SDL_env[i] && !value; ++i ) { |
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165 if ( (strncmp(SDL_env[i], name, len) == 0) && |
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166 (SDL_env[i][len] == '=') ) { |
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167 value = &SDL_env[i][len+1]; |
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168 } |
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169 } |
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170 } |
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171 return value; |
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172 } |
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173 |
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174 #endif /* WIN32 */ |
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175 |
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|
176 #ifdef TEST_MAIN |
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177 #include <stdio.h> |
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178 |
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179 int main(int argc, char *argv[]) |
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180 { |
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181 char *value; |
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182 |
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183 printf("Checking for non-existent variable... "); |
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184 fflush(stdout); |
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185 if ( ! getenv("EXISTS") ) { |
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186 printf("okay\n"); |
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187 } else { |
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188 printf("failed\n"); |
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189 } |
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190 printf("Setting FIRST=VALUE1 in the environment... "); |
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191 fflush(stdout); |
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192 if ( putenv("FIRST=VALUE1") == 0 ) { |
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193 printf("okay\n"); |
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194 } else { |
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195 printf("failed\n"); |
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196 } |
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197 printf("Getting FIRST from the environment... "); |
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198 fflush(stdout); |
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199 value = getenv("FIRST"); |
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200 if ( value && (strcmp(value, "VALUE1") == 0) ) { |
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201 printf("okay\n"); |
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202 } else { |
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203 printf("failed\n"); |
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204 } |
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205 printf("Setting SECOND=VALUE2 in the environment... "); |
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206 fflush(stdout); |
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207 if ( putenv("SECOND=VALUE2") == 0 ) { |
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208 printf("okay\n"); |
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209 } else { |
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210 printf("failed\n"); |
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211 } |
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212 printf("Getting SECOND from the environment... "); |
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213 fflush(stdout); |
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214 value = getenv("SECOND"); |
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215 if ( value && (strcmp(value, "VALUE2") == 0) ) { |
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216 printf("okay\n"); |
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217 } else { |
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218 printf("failed\n"); |
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219 } |
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220 printf("Setting FIRST=NOVALUE in the environment... "); |
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221 fflush(stdout); |
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222 if ( putenv("FIRST=NOVALUE") == 0 ) { |
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223 printf("okay\n"); |
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224 } else { |
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225 printf("failed\n"); |
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226 } |
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227 printf("Getting FIRST from the environment... "); |
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228 fflush(stdout); |
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229 value = getenv("FIRST"); |
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230 if ( value && (strcmp(value, "NOVALUE") == 0) ) { |
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231 printf("okay\n"); |
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232 } else { |
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233 printf("failed\n"); |
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234 } |
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235 printf("Checking for non-existent variable... "); |
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236 fflush(stdout); |
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237 if ( ! getenv("EXISTS") ) { |
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238 printf("okay\n"); |
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239 } else { |
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240 printf("failed\n"); |
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|
241 } |
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242 return(0); |
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|
243 } |
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Sam Lantinga <slouken@libsdl.org>
parents:
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changeset
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244 #endif /* TEST_MAIN */ |
450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff
changeset
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245 |