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annotate src/stdlib/SDL_getenv.c @ 3957:b1d5b56aa549 SDL-1.2

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Date: Mon, 4 Jun 2007 06:17:59 +0000 (UTC) From: George Gensure <werkt0@gmail.com> Subject: [SDL] error removal patch for SDL_x11dyn.c I found that calling SDL_GetError when an error hasn't necessarily occurred is still reporting problems from loadso regarding dynamic functions in X11. I've added the following to my local copy to avoid revealing the 'many library lookup' approach adopted by x11dyn.c:
author Ryan C. Gordon <icculus@icculus.org>
date Wed, 13 Jun 2007 07:54:10 +0000
parents 4aac8563c296
children 782fd950bd46 c121d94672cb e85e65aec22f
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 SDL_putenv(const char *variable)
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40 {
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41 size_t bufferlen;
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42 char *value;
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43 const char *sep;
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44
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45 sep = SDL_strchr(variable, '=');
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46 if ( sep == NULL ) {
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47 return -1;
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48 }
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49 bufferlen = SDL_strlen(variable)+1;
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50 if ( bufferlen > SDL_envmemlen ) {
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51 char *newmem = (char *)SDL_realloc(SDL_envmem, bufferlen);
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52 if ( newmem == NULL ) {
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53 return -1;
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54 }
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55 SDL_envmem = newmem;
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56 SDL_envmemlen = bufferlen;
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57 }
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58 SDL_strlcpy(SDL_envmem, variable, bufferlen);
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59 value = SDL_envmem + (sep - variable);
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60 *value++ = '\0';
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61 if ( !SetEnvironmentVariable(SDL_envmem, *value ? value : NULL) ) {
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62 return -1;
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63 }
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64 return 0;
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65 }
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66
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67 /* Retrieve a variable named "name" from the environment */
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68 char *SDL_getenv(const char *name)
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69 {
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70 size_t bufferlen;
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71
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72 bufferlen = GetEnvironmentVariable(name, SDL_envmem, (DWORD)SDL_envmemlen);
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73 if ( bufferlen == 0 ) {
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74 return NULL;
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75 }
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76 if ( bufferlen > SDL_envmemlen ) {
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77 char *newmem = (char *)SDL_realloc(SDL_envmem, bufferlen);
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78 if ( newmem == NULL ) {
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79 return NULL;
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80 }
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81 SDL_envmem = newmem;
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82 SDL_envmemlen = bufferlen;
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83 GetEnvironmentVariable(name, SDL_envmem, (DWORD)SDL_envmemlen);
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84 }
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85 return SDL_envmem;
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86 }
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87
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88 #else /* roll our own */
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89
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90 static char **SDL_env = (char **)0;
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91
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92 /* Put a variable of the form "name=value" into the environment */
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93 int SDL_putenv(const char *variable)
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94 {
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95 const char *name, *value;
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96 int added;
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97 int len, i;
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98 char **new_env;
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99 char *new_variable;
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100
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101 /* A little error checking */
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102 if ( ! variable ) {
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103 return(-1);
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104 }
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105 name = variable;
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106 for ( value=variable; *value && (*value != '='); ++value ) {
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107 /* Keep looking for '=' */ ;
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108 }
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109 if ( *value ) {
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110 ++value;
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111 } else {
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112 return(-1);
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113 }
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114
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115 /* Allocate memory for the variable */
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116 new_variable = SDL_strdup(variable);
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117 if ( ! new_variable ) {
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118 return(-1);
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119 }
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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 ( SDL_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 SDL_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 ) {
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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142 new_env = SDL_realloc(SDL_env, (i+2)*sizeof(char *));
1330
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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 SDL_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 = SDL_strlen(name);
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164 for ( i=0; SDL_env[i] && !value; ++i ) {
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165 if ( (SDL_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
1402
d910939febfa Use consistent identifiers for the various platforms we support.
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174 #endif /* __WIN32__ */
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175
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176 #endif /* !HAVE_GETENV */
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177
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178 #ifdef TEST_MAIN
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179 #include <stdio.h>
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180
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181 int main(int argc, char *argv[])
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182 {
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183 char *value;
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184
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185 printf("Checking for non-existent variable... ");
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186 fflush(stdout);
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187 if ( ! SDL_getenv("EXISTS") ) {
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188 printf("okay\n");
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189 } else {
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190 printf("failed\n");
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191 }
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192 printf("Setting FIRST=VALUE1 in the environment... ");
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193 fflush(stdout);
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194 if ( SDL_putenv("FIRST=VALUE1") == 0 ) {
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195 printf("okay\n");
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196 } else {
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197 printf("failed\n");
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198 }
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199 printf("Getting FIRST from the environment... ");
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200 fflush(stdout);
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201 value = SDL_getenv("FIRST");
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202 if ( value && (SDL_strcmp(value, "VALUE1") == 0) ) {
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203 printf("okay\n");
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204 } else {
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205 printf("failed\n");
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206 }
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207 printf("Setting SECOND=VALUE2 in the environment... ");
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208 fflush(stdout);
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209 if ( SDL_putenv("SECOND=VALUE2") == 0 ) {
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210 printf("okay\n");
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211 } else {
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diff changeset
212 printf("failed\n");
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213 }
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214 printf("Getting SECOND from the environment... ");
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215 fflush(stdout);
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216 value = SDL_getenv("SECOND");
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217 if ( value && (SDL_strcmp(value, "VALUE2") == 0) ) {
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218 printf("okay\n");
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diff changeset
219 } else {
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220 printf("failed\n");
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221 }
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diff changeset
222 printf("Setting FIRST=NOVALUE in the environment... ");
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223 fflush(stdout);
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224 if ( SDL_putenv("FIRST=NOVALUE") == 0 ) {
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225 printf("okay\n");
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226 } else {
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227 printf("failed\n");
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228 }
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229 printf("Getting FIRST from the environment... ");
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230 fflush(stdout);
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231 value = SDL_getenv("FIRST");
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diff changeset
232 if ( value && (SDL_strcmp(value, "NOVALUE") == 0) ) {
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233 printf("okay\n");
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diff changeset
234 } else {
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235 printf("failed\n");
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diff changeset
236 }
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237 printf("Checking for non-existent variable... ");
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238 fflush(stdout);
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239 if ( ! SDL_getenv("EXISTS") ) {
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240 printf("okay\n");
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parents:
diff changeset
241 } else {
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parents:
diff changeset
242 printf("failed\n");
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parents:
diff changeset
243 }
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diff changeset
244 return(0);
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
245 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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246 #endif /* TEST_MAIN */
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
247