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annotate src/stdlib/SDL_getenv.c @ 1662:782fd950bd46 SDL-1.3

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Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API. WARNING: None of the video drivers have been updated for the new API yet! The API is still under design and very fluid. The code is now run through a consistent indent format: indent -i4 -nut -nsc -br -ce The headers are being converted to automatically generate doxygen documentation.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 28 May 2006 13:04:16 +0000
parents 4aac8563c296
children 4da1ee79c9af
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 #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 of the form "name=value" into the environment */
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39 int
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40 SDL_putenv (const char *variable)
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41 {
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42 size_t bufferlen;
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43 char *value;
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44 const char *sep;
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45
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46 sep = SDL_strchr (variable, '=');
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47 if (sep == NULL) {
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48 return -1;
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49 }
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50 bufferlen = SDL_strlen (variable) + 1;
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51 if (bufferlen > SDL_envmemlen) {
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52 char *newmem = (char *) SDL_realloc (SDL_envmem, bufferlen);
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53 if (newmem == NULL) {
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54 return -1;
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55 }
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56 SDL_envmem = newmem;
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57 SDL_envmemlen = bufferlen;
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58 }
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59 SDL_strlcpy (SDL_envmem, variable, bufferlen);
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60 value = SDL_envmem + (sep - variable);
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61 *value++ = '\0';
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62 if (!SetEnvironmentVariable (SDL_envmem, *value ? value : NULL)) {
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63 return -1;
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64 }
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65 return 0;
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66 }
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67
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68 /* Retrieve a variable named "name" from the environment */
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69 char *
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70 SDL_getenv (const char *name)
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71 {
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72 size_t bufferlen;
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73
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74 bufferlen =
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75 GetEnvironmentVariable (name, SDL_envmem, (DWORD) SDL_envmemlen);
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76 if (bufferlen == 0) {
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77 return NULL;
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78 }
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79 if (bufferlen > SDL_envmemlen) {
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80 char *newmem = (char *) SDL_realloc (SDL_envmem, bufferlen);
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81 if (newmem == NULL) {
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82 return NULL;
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83 }
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84 SDL_envmem = newmem;
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85 SDL_envmemlen = bufferlen;
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86 GetEnvironmentVariable (name, SDL_envmem, (DWORD) SDL_envmemlen);
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87 }
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88 return SDL_envmem;
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89 }
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90
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91 #else /* roll our own */
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92
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93 static char **SDL_env = (char **) 0;
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94
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95 /* Put a variable of the form "name=value" into the environment */
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96 int
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97 SDL_putenv (const char *variable)
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98 {
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99 const char *name, *value;
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100 int added;
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101 int len, i;
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102 char **new_env;
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103 char *new_variable;
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104
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105 /* A little error checking */
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106 if (!variable) {
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107 return (-1);
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108 }
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109 name = variable;
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110 for (value = variable; *value && (*value != '='); ++value) {
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111 /* Keep looking for '=' */ ;
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112 }
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113 if (*value) {
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114 ++value;
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115 } else {
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116 return (-1);
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117 }
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118
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119 /* Allocate memory for the variable */
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120 new_variable = SDL_strdup (variable);
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121 if (!new_variable) {
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122 return (-1);
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123 }
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124
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125 /* Actually put it into the environment */
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126 added = 0;
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127 i = 0;
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128 if (SDL_env) {
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129 /* Check to see if it's already there... */
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130 len = (value - name);
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131 for (; SDL_env[i]; ++i) {
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132 if (SDL_strncmp (SDL_env[i], name, len) == 0) {
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133 break;
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134 }
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135 }
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136 /* If we found it, just replace the entry */
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137 if (SDL_env[i]) {
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138 SDL_free (SDL_env[i]);
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139 SDL_env[i] = new_variable;
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140 added = 1;
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141 }
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142 }
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143
1662
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144 /* Didn't find it in the environment, expand and add */
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145 if (!added) {
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146 new_env = SDL_realloc (SDL_env, (i + 2) * sizeof (char *));
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147 if (new_env) {
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148 SDL_env = new_env;
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149 SDL_env[i++] = new_variable;
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150 SDL_env[i++] = (char *) 0;
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151 added = 1;
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152 } else {
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153 SDL_free (new_variable);
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154 }
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155 }
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156 return (added ? 0 : -1);
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157 }
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158
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159 /* Retrieve a variable named "name" from the environment */
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160 char *
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161 SDL_getenv (const char *name)
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162 {
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163 int len, i;
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164 char *value;
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165
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166 value = (char *) 0;
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167 if (SDL_env) {
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168 len = SDL_strlen (name);
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169 for (i = 0; SDL_env[i] && !value; ++i) {
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170 if ((SDL_strncmp (SDL_env[i], name, len) == 0) &&
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171 (SDL_env[i][len] == '=')) {
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172 value = &SDL_env[i][len + 1];
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173 }
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174 }
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175 }
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diff changeset
176 return value;
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177 }
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178
1402
d910939febfa Use consistent identifiers for the various platforms we support.
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diff changeset
179 #endif /* __WIN32__ */
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180
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181 #endif /* !HAVE_GETENV */
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182
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183 #ifdef TEST_MAIN
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184 #include <stdio.h>
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185
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186 int
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187 main (int argc, char *argv[])
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188 {
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189 char *value;
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190
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191 printf ("Checking for non-existent variable... ");
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192 fflush (stdout);
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193 if (!SDL_getenv ("EXISTS")) {
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194 printf ("okay\n");
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195 } else {
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196 printf ("failed\n");
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197 }
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198 printf ("Setting FIRST=VALUE1 in the environment... ");
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199 fflush (stdout);
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200 if (SDL_putenv ("FIRST=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 ("Getting FIRST from the environment... ");
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206 fflush (stdout);
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207 value = SDL_getenv ("FIRST");
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208 if (value && (SDL_strcmp (value, "VALUE1") == 0)) {
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diff changeset
209 printf ("okay\n");
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210 } else {
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diff changeset
211 printf ("failed\n");
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212 }
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diff changeset
213 printf ("Setting SECOND=VALUE2 in the environment... ");
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214 fflush (stdout);
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diff changeset
215 if (SDL_putenv ("SECOND=VALUE2") == 0) {
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diff changeset
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 ("Getting SECOND from the environment... ");
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221 fflush (stdout);
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222 value = SDL_getenv ("SECOND");
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223 if (value && (SDL_strcmp (value, "VALUE2") == 0)) {
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224 printf ("okay\n");
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225 } else {
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226 printf ("failed\n");
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227 }
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diff changeset
228 printf ("Setting FIRST=NOVALUE in the environment... ");
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229 fflush (stdout);
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diff changeset
230 if (SDL_putenv ("FIRST=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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diff changeset
235 printf ("Getting FIRST from the environment... ");
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236 fflush (stdout);
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237 value = SDL_getenv ("FIRST");
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diff changeset
238 if (value && (SDL_strcmp (value, "NOVALUE") == 0)) {
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diff changeset
239 printf ("okay\n");
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240 } else {
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241 printf ("failed\n");
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242 }
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243 printf ("Checking for non-existent variable... ");
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244 fflush (stdout);
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245 if (!SDL_getenv ("EXISTS")) {
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246 printf ("okay\n");
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247 } else {
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248 printf ("failed\n");
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249 }
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250 return (0);
1330
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parents:
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251 }
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252 #endif /* TEST_MAIN */
1662
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253 /* vi: set ts=4 sw=4 expandtab: */