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annotate src/stdlib/SDL_getenv.c @ 3697:f7b03b6838cb

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Fixed bug #926 Updated copyright to LGPL version 2.1 and year 2010
author Sam Lantinga <slouken@libsdl.org>
date Sun, 24 Jan 2010 21:10:53 +0000
parents db4af3cb938e
children e8916fe9cfc8
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 #define WIN32_LEAN_AND_MEAN
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31 #include <windows.h>
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32
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33 /* Note this isn't thread-safe! */
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34
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35 static char *SDL_envmem = NULL; /* Ugh, memory leak */
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36 static size_t SDL_envmemlen = 0;
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37
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38 /* Put a variable into the environment */
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39 int
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40 SDL_setenv(const char *name, const char *value, int overwrite)
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41 {
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42 if (!overwrite) {
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43 char ch = 0;
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44 const size_t len = GetEnvironmentVariable(name, &ch, sizeof (ch));
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45 if (len > 0) {
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46 return 0; /* asked not to overwrite existing value. */
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47 }
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48 }
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49 if (!SetEnvironmentVariable(name, *value ? value : NULL)) {
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50 return -1;
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51 }
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52 return 0;
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53 }
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54
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55 /* Retrieve a variable named "name" from the environment */
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56 char *
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57 SDL_getenv(const char *name)
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58 {
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59 size_t bufferlen;
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60
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61 bufferlen =
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62 GetEnvironmentVariable(name, SDL_envmem, (DWORD) SDL_envmemlen);
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63 if (bufferlen == 0) {
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64 return NULL;
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65 }
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66 if (bufferlen > SDL_envmemlen) {
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67 char *newmem = (char *) SDL_realloc(SDL_envmem, bufferlen);
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68 if (newmem == NULL) {
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69 return NULL;
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70 }
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71 SDL_envmem = newmem;
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72 SDL_envmemlen = bufferlen;
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73 GetEnvironmentVariable(name, SDL_envmem, (DWORD) SDL_envmemlen);
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74 }
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75 return SDL_envmem;
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76 }
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77
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78 #else /* roll our own */
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79
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80 static char **SDL_env = (char **) 0;
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81
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82 /* Put a variable into the environment */
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83 int
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84 SDL_setenv(const char *name, const char *value, int overwrite)
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85 {
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86 int added;
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87 int len, i;
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88 char **new_env;
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89 char *new_variable;
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90
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91 /* A little error checking */
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92 if (!name || !value) {
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93 return (-1);
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94 }
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95
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96 /* See if it already exists */
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97 if (!overwrite && SDL_getenv(name)) {
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98 return 0;
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99 }
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100
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101 /* Allocate memory for the variable */
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102 len = SDL_strlen(name) + SDL_strlen(value) + 2;
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103 new_variable = (char *) SDL_malloc(len);
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104 if (!new_variable) {
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105 return (-1);
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106 }
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107
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108 SDL_snprintf(new_variable, len, "%s=%s", name, value);
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109 value = new_variable + SDL_strlen(name) + 1;
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110 name = new_variable;
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111
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112 /* Actually put it into the environment */
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113 added = 0;
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114 i = 0;
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115 if (SDL_env) {
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116 /* Check to see if it's already there... */
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117 len = (value - name);
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118 for (; SDL_env[i]; ++i) {
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119 if (SDL_strncmp(SDL_env[i], name, len) == 0) {
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120 break;
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121 }
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122 }
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123 /* If we found it, just replace the entry */
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124 if (SDL_env[i]) {
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125 SDL_free(SDL_env[i]);
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126 SDL_env[i] = new_variable;
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127 added = 1;
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128 }
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129 }
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130
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131 /* Didn't find it in the environment, expand and add */
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132 if (!added) {
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133 new_env = SDL_realloc(SDL_env, (i + 2) * sizeof(char *));
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134 if (new_env) {
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135 SDL_env = new_env;
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136 SDL_env[i++] = new_variable;
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137 SDL_env[i++] = (char *) 0;
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138 added = 1;
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139 } else {
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140 SDL_free(new_variable);
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141 }
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diff changeset
142 }
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143 return (added ? 0 : -1);
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144 }
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145
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146 /* Retrieve a variable named "name" from the environment */
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147 char *
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148 SDL_getenv(const char *name)
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149 {
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diff changeset
150 int len, i;
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151 char *value;
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152
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153 value = (char *) 0;
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154 if (SDL_env) {
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155 len = SDL_strlen(name);
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156 for (i = 0; SDL_env[i] && !value; ++i) {
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157 if ((SDL_strncmp(SDL_env[i], name, len) == 0) &&
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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158 (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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159 value = &SDL_env[i][len + 1];
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160 }
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diff changeset
161 }
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diff changeset
162 }
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163 return value;
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164 }
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165
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166 #endif /* __WIN32__ */
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167
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168 #endif /* !HAVE_GETENV */
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169
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170
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171 /* We have a real environment table, but no real setenv? Fake it w/ putenv. */
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172 #if (defined(HAVE_GETENV) && defined(HAVE_PUTENV) && !defined(HAVE_SETENV))
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173 int
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174 SDL_setenv(const char *name, const char *value, int overwrite)
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175 {
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176 size_t len;
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diff changeset
177 char *new_variable;
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diff changeset
178
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179 if (getenv(name) != NULL) {
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180 if (overwrite) {
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diff changeset
181 unsetenv(name);
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diff changeset
182 } else {
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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diff changeset
183 return 0; /* leave the existing one there. */
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184 }
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185 }
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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186
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187 /* This leaks. Sorry. Get a better OS so we don't have to do this. */
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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188 len = SDL_strlen(name) + SDL_strlen(value) + 2;
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189 new_variable = (char *) SDL_malloc(len);
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190 if (!new_variable) {
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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diff changeset
191 return (-1);
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
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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194 SDL_snprintf(new_variable, len, "%s=%s", name, value);
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195 return putenv(new_variable);
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196 }
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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197 #endif
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198
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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diff changeset
199
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200 #ifdef TEST_MAIN
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201 #include <stdio.h>
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202
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203 int
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204 main(int argc, char *argv[])
1330
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205 {
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206 char *value;
1330
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diff changeset
207
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208 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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209 fflush(stdout);
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210 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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211 printf("okay\n");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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212 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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213 printf("failed\n");
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diff changeset
214 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
215 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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216 fflush(stdout);
3591
db4af3cb938e Updated test code to use SDL_setenv()
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diff changeset
217 if (SDL_setenv("FIRST", "VALUE1", 0) == 0) {
1895
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diff changeset
218 printf("okay\n");
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
219 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
220 printf("failed\n");
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
221 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
222 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
223 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
224 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
225 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
226 printf("okay\n");
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diff changeset
227 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
228 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
229 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
230 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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diff changeset
231 fflush(stdout);
3591
db4af3cb938e Updated test code to use SDL_setenv()
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diff changeset
232 if (SDL_setenv("SECOND", "VALUE2", 0) == 0) {
1895
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233 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
234 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
235 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
236 }
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
237 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
238 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
239 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
240 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
241 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
242 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
243 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
244 }
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
245 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
246 fflush(stdout);
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diff changeset
247 if (SDL_setenv("FIRST", "NOVALUE", 1) == 0) {
1895
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diff changeset
248 printf("okay\n");
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diff changeset
249 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
250 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
251 }
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
252 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
253 fflush(stdout);
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
254 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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parents: 1472
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255 if (value && (SDL_strcmp(value, "NOVALUE") == 0)) {
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256 printf("okay\n");
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257 } else {
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258 printf("failed\n");
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259 }
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260 printf("Checking for non-existent variable... ");
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261 fflush(stdout);
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262 if (!SDL_getenv("EXISTS")) {
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263 printf("okay\n");
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264 } else {
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265 printf("failed\n");
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266 }
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267 return (0);
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268 }
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269 #endif /* TEST_MAIN */
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270
1895
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271 /* vi: set ts=4 sw=4 expandtab: */