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annotate src/stdlib/SDL_getenv.c @ 5260:b0f5108fda60

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Cleaned up the file a bit for tutorial viewing
author Sam Lantinga <slouken@libsdl.org>
date Fri, 11 Feb 2011 13:06:35 -0800
parents 327f181542f1
children b530ef003506
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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 #include "SDL_config.h"
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23
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24 #include "SDL_stdinc.h"
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25
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26 #ifndef HAVE_GETENV
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27
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28 #if defined(__WIN32__) && !defined(_WIN32_WCE)
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29
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30 #include "../core/windows/SDL_windows.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 size_t SDL_envmemlen = 0;
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36
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37 /* Put a variable into the environment */
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38 int
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39 SDL_setenv(const char *name, const char *value, int overwrite)
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40 {
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41 if (!overwrite) {
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42 char ch = 0;
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43 const size_t len = GetEnvironmentVariableA(name, &ch, sizeof (ch));
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44 if (len > 0) {
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45 return 0; /* asked not to overwrite existing value. */
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46 }
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47 }
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48 if (!SetEnvironmentVariableA(name, *value ? value : NULL)) {
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49 return -1;
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50 }
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51 return 0;
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52 }
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53
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54 /* Retrieve a variable named "name" from the environment */
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55 char *
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56 SDL_getenv(const char *name)
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57 {
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58 size_t bufferlen;
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59
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60 bufferlen =
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61 GetEnvironmentVariableA(name, SDL_envmem, (DWORD) SDL_envmemlen);
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62 if (bufferlen == 0) {
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63 return NULL;
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64 }
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65 if (bufferlen > SDL_envmemlen) {
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66 char *newmem = (char *) SDL_realloc(SDL_envmem, bufferlen);
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67 if (newmem == NULL) {
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68 return NULL;
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69 }
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70 SDL_envmem = newmem;
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71 SDL_envmemlen = bufferlen;
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72 GetEnvironmentVariableA(name, SDL_envmem, (DWORD) SDL_envmemlen);
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73 }
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74 return SDL_envmem;
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75 }
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76
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77 #else /* roll our own */
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78
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79 static char **SDL_env = (char **) 0;
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80
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81 /* Put a variable into the environment */
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82 int
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83 SDL_setenv(const char *name, const char *value, int overwrite)
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84 {
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85 int added;
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86 int len, i;
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87 char **new_env;
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88 char *new_variable;
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89
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90 /* A little error checking */
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91 if (!name || !value) {
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92 return (-1);
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93 }
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94
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95 /* See if it already exists */
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96 if (!overwrite && SDL_getenv(name)) {
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97 return 0;
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98 }
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99
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100 /* Allocate memory for the variable */
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101 len = SDL_strlen(name) + SDL_strlen(value) + 2;
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102 new_variable = (char *) SDL_malloc(len);
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103 if (!new_variable) {
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104 return (-1);
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105 }
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106
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107 SDL_snprintf(new_variable, len, "%s=%s", name, value);
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108 value = new_variable + SDL_strlen(name) + 1;
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109 name = new_variable;
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110
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111 /* Actually put it into the environment */
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112 added = 0;
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113 i = 0;
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114 if (SDL_env) {
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115 /* Check to see if it's already there... */
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116 len = (value - name);
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117 for (; SDL_env[i]; ++i) {
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118 if (SDL_strncmp(SDL_env[i], name, len) == 0) {
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119 break;
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120 }
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121 }
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122 /* If we found it, just replace the entry */
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123 if (SDL_env[i]) {
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124 SDL_free(SDL_env[i]);
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125 SDL_env[i] = new_variable;
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126 added = 1;
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127 }
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128 }
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129
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130 /* Didn't find it in the environment, expand and add */
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131 if (!added) {
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132 new_env = SDL_realloc(SDL_env, (i + 2) * sizeof(char *));
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133 if (new_env) {
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134 SDL_env = new_env;
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135 SDL_env[i++] = new_variable;
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136 SDL_env[i++] = (char *) 0;
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137 added = 1;
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138 } else {
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139 SDL_free(new_variable);
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140 }
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141 }
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142 return (added ? 0 : -1);
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143 }
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144
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145 /* Retrieve a variable named "name" from the environment */
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146 char *
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147 SDL_getenv(const char *name)
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148 {
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149 int len, i;
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150 char *value;
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151
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152 value = (char *) 0;
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153 if (SDL_env) {
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154 len = SDL_strlen(name);
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155 for (i = 0; SDL_env[i] && !value; ++i) {
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156 if ((SDL_strncmp(SDL_env[i], name, len) == 0) &&
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157 (SDL_env[i][len] == '=')) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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158 value = &SDL_env[i][len + 1];
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159 }
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160 }
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161 }
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162 return value;
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163 }
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164
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165 #endif /* __WIN32__ */
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166
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167 #endif /* !HAVE_GETENV */
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168
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169
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170 /* We have a real environment table, but no real setenv? Fake it w/ putenv. */
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171 #if (defined(HAVE_GETENV) && defined(HAVE_PUTENV) && !defined(HAVE_SETENV))
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172 int
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173 SDL_setenv(const char *name, const char *value, int overwrite)
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174 {
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175 size_t len;
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176 char *new_variable;
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diff changeset
177
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178 if (getenv(name) != NULL) {
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179 if (overwrite) {
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180 unsetenv(name);
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diff changeset
181 } else {
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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182 return 0; /* leave the existing one there. */
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183 }
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184 }
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185
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186 /* This leaks. Sorry. Get a better OS so we don't have to do this. */
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187 len = SDL_strlen(name) + SDL_strlen(value) + 2;
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188 new_variable = (char *) SDL_malloc(len);
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diff changeset
189 if (!new_variable) {
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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190 return (-1);
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191 }
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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192
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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193 SDL_snprintf(new_variable, len, "%s=%s", name, value);
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194 return putenv(new_variable);
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195 }
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196 #endif
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197
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diff changeset
198
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199 #ifdef TEST_MAIN
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200 #include <stdio.h>
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201
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202 int
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203 main(int argc, char *argv[])
1330
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204 {
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205 char *value;
1330
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206
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diff changeset
207 printf("Checking for non-existent variable... ");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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208 fflush(stdout);
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diff changeset
209 if (!SDL_getenv("EXISTS")) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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210 printf("okay\n");
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211 } else {
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212 printf("failed\n");
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diff changeset
213 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
214 printf("Setting FIRST=VALUE1 in the environment... ");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
215 fflush(stdout);
3591
db4af3cb938e Updated test code to use SDL_setenv()
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diff changeset
216 if (SDL_setenv("FIRST", "VALUE1", 0) == 0) {
1895
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diff changeset
217 printf("okay\n");
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diff changeset
218 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
219 printf("failed\n");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
220 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
221 printf("Getting FIRST from the environment... ");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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222 fflush(stdout);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
223 value = SDL_getenv("FIRST");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
224 if (value && (SDL_strcmp(value, "VALUE1") == 0)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
225 printf("okay\n");
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diff changeset
226 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
227 printf("failed\n");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
228 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
229 printf("Setting SECOND=VALUE2 in the environment... ");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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230 fflush(stdout);
3591
db4af3cb938e Updated test code to use SDL_setenv()
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diff changeset
231 if (SDL_setenv("SECOND", "VALUE2", 0) == 0) {
1895
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232 printf("okay\n");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
233 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
234 printf("failed\n");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1472
diff changeset
235 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
236 printf("Getting SECOND from the environment... ");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
237 fflush(stdout);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
238 value = SDL_getenv("SECOND");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1472
diff changeset
239 if (value && (SDL_strcmp(value, "VALUE2") == 0)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
240 printf("okay\n");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
241 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
242 printf("failed\n");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
243 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
244 printf("Setting FIRST=NOVALUE in the environment... ");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
245 fflush(stdout);
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diff changeset
246 if (SDL_setenv("FIRST", "NOVALUE", 1) == 0) {
1895
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diff changeset
247 printf("okay\n");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
248 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
249 printf("failed\n");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
250 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1472
diff changeset
251 printf("Getting FIRST from the environment... ");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
252 fflush(stdout);
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parents: 1472
diff changeset
253 value = SDL_getenv("FIRST");
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254 if (value && (SDL_strcmp(value, "NOVALUE") == 0)) {
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255 printf("okay\n");
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256 } else {
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257 printf("failed\n");
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258 }
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259 printf("Checking for non-existent variable... ");
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260 fflush(stdout);
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261 if (!SDL_getenv("EXISTS")) {
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262 printf("okay\n");
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263 } else {
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264 printf("failed\n");
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265 }
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266 return (0);
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267 }
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268 #endif /* TEST_MAIN */
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269
1895
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270 /* vi: set ts=4 sw=4 expandtab: */