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annotate src/stdlib/SDL_getenv.c @ 1379:c0a74f199ecf

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Use only safe string functions
author Sam Lantinga <slouken@libsdl.org>
date Sun, 19 Feb 2006 23:46:34 +0000
parents c71e05b4dc2e
children d910939febfa
rev   line source
1330
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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
1354
22f39393668a Fixed build problem with SDL_string.c
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23 #include "SDL_stdinc.h"
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24
1331
1cbaeee565b1 A few fixes to get this building on Linux again
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25 #ifndef HAVE_GETENV
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26
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27 #if defined(WIN32) && !defined(_WIN32_WCE)
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28
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29 #include "SDL_windows.h"
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30
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31 /* Note this isn't thread-safe! */
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32
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33 static char *SDL_envmem = NULL; /* Ugh, memory leak */
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34 static DWORD SDL_envmemlen = 0;
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35
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36 /* Put a variable of the form "name=value" into the environment */
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37 int SDL_putenv(const char *variable)
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38 {
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39 DWORD bufferlen;
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40 char *value;
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41 const char *sep;
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42
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3692456e7b0f Use SDL_ prefixed versions of C library functions.
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43 sep = SDL_strchr(variable, '=');
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44 if ( sep == NULL ) {
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45 return -1;
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46 }
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47 bufferlen = SDL_strlen(variable)+1;
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48 if ( bufferlen > SDL_envmemlen ) {
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49 char *newmem = (char *)SDL_realloc(SDL_envmem, bufferlen);
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50 if ( newmem == NULL ) {
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51 return -1;
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52 }
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53 SDL_envmem = newmem;
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54 SDL_envmemlen = bufferlen;
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55 }
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56 SDL_strlcpy(SDL_envmem, variable, bufferlen);
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57 value = SDL_envmem + (sep - variable);
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58 *value++ = '\0';
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59 if ( !SetEnvironmentVariable(SDL_envmem, *value ? value : NULL) ) {
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60 return -1;
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61 }
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62 return 0;
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63 }
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64
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65 /* Retrieve a variable named "name" from the environment */
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66 char *SDL_getenv(const char *name)
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67 {
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68 DWORD bufferlen;
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69
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70 bufferlen = GetEnvironmentVariable(name, SDL_envmem, SDL_envmemlen);
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71 if ( bufferlen == 0 ) {
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72 return NULL;
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73 }
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74 if ( bufferlen > SDL_envmemlen ) {
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75 char *newmem = (char *)SDL_realloc(SDL_envmem, bufferlen);
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76 if ( newmem == NULL ) {
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77 return NULL;
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78 }
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79 SDL_envmem = newmem;
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80 SDL_envmemlen = bufferlen;
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81 GetEnvironmentVariable(name, SDL_envmem, SDL_envmemlen);
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82 }
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83 return SDL_envmem;
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84 }
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85
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86 #else /* roll our own */
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87
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88 static char **SDL_env = (char **)0;
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89
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90 /* Put a variable of the form "name=value" into the environment */
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91 int SDL_putenv(const char *variable)
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92 {
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93 const char *name, *value;
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94 int added;
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95 int len, i;
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96 char **new_env;
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97 char *new_variable;
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98
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99 /* A little error checking */
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100 if ( ! variable ) {
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101 return(-1);
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102 }
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103 name = variable;
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104 for ( value=variable; *value && (*value != '='); ++value ) {
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105 /* Keep looking for '=' */ ;
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106 }
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107 if ( *value ) {
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108 ++value;
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109 } else {
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110 return(-1);
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111 }
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112
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113 /* Allocate memory for the variable */
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114 new_variable = SDL_strdup(variable);
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115 if ( ! new_variable ) {
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116 return(-1);
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117 }
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118
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119 /* Actually put it into the environment */
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120 added = 0;
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121 i = 0;
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122 if ( SDL_env ) {
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123 /* Check to see if it's already there... */
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124 len = (value - name);
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125 for ( ; SDL_env[i]; ++i ) {
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126 if ( SDL_strncmp(SDL_env[i], name, len) == 0 ) {
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127 break;
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128 }
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129 }
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130 /* If we found it, just replace the entry */
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131 if ( SDL_env[i] ) {
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132 SDL_free(SDL_env[i]);
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133 SDL_env[i] = new_variable;
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134 added = 1;
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135 }
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136 }
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137
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138 /* Didn't find it in the environment, expand and add */
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139 if ( ! added ) {
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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140 new_env = SDL_realloc(SDL_env, (i+2)*sizeof(char *));
1330
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141 if ( new_env ) {
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142 SDL_env = new_env;
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143 SDL_env[i++] = new_variable;
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144 SDL_env[i++] = (char *)0;
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145 added = 1;
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diff changeset
146 } else {
1341
d02b552e5304 Configure dynamically generates SDL_config.h
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diff changeset
147 SDL_free(new_variable);
1330
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148 }
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149 }
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diff changeset
150 return (added ? 0 : -1);
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151 }
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152
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153 /* Retrieve a variable named "name" from the environment */
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154 char *SDL_getenv(const char *name)
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diff changeset
155 {
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
156 int len, i;
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diff changeset
157 char *value;
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diff changeset
158
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diff changeset
159 value = (char *)0;
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diff changeset
160 if ( SDL_env ) {
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d02b552e5304 Configure dynamically generates SDL_config.h
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diff changeset
161 len = SDL_strlen(name);
1330
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162 for ( i=0; SDL_env[i] && !value; ++i ) {
1341
d02b552e5304 Configure dynamically generates SDL_config.h
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diff changeset
163 if ( (SDL_strncmp(SDL_env[i], name, len) == 0) &&
1330
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diff changeset
164 (SDL_env[i][len] == '=') ) {
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diff changeset
165 value = &SDL_env[i][len+1];
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166 }
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diff changeset
167 }
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diff changeset
168 }
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diff changeset
169 return value;
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170 }
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171
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diff changeset
172 #endif /* WIN32 */
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173
1331
1cbaeee565b1 A few fixes to get this building on Linux again
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diff changeset
174 #endif /* !HAVE_GETENV */
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175
1330
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176 #ifdef TEST_MAIN
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177 #include <stdio.h>
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178
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diff changeset
179 int main(int argc, char *argv[])
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diff changeset
180 {
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diff changeset
181 char *value;
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diff changeset
182
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diff changeset
183 printf("Checking for non-existent variable... ");
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diff changeset
184 fflush(stdout);
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diff changeset
185 if ( ! SDL_getenv("EXISTS") ) {
1330
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diff changeset
186 printf("okay\n");
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parents:
diff changeset
187 } else {
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
188 printf("failed\n");
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
189 }
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diff changeset
190 printf("Setting FIRST=VALUE1 in the environment... ");
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diff changeset
191 fflush(stdout);
1341
d02b552e5304 Configure dynamically generates SDL_config.h
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diff changeset
192 if ( SDL_putenv("FIRST=VALUE1") == 0 ) {
1330
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diff changeset
193 printf("okay\n");
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parents:
diff changeset
194 } else {
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
195 printf("failed\n");
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parents:
diff changeset
196 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
197 printf("Getting FIRST from the environment... ");
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diff changeset
198 fflush(stdout);
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d02b552e5304 Configure dynamically generates SDL_config.h
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diff changeset
199 value = SDL_getenv("FIRST");
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200 if ( value && (SDL_strcmp(value, "VALUE1") == 0) ) {
1330
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diff changeset
201 printf("okay\n");
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parents:
diff changeset
202 } else {
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
203 printf("failed\n");
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parents:
diff changeset
204 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
205 printf("Setting SECOND=VALUE2 in the environment... ");
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
206 fflush(stdout);
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d02b552e5304 Configure dynamically generates SDL_config.h
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diff changeset
207 if ( SDL_putenv("SECOND=VALUE2") == 0 ) {
1330
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diff changeset
208 printf("okay\n");
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
209 } else {
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
210 printf("failed\n");
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parents:
diff changeset
211 }
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
212 printf("Getting SECOND from the environment... ");
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
213 fflush(stdout);
1341
d02b552e5304 Configure dynamically generates SDL_config.h
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diff changeset
214 value = SDL_getenv("SECOND");
d02b552e5304 Configure dynamically generates SDL_config.h
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parents: 1336
diff changeset
215 if ( value && (SDL_strcmp(value, "VALUE2") == 0) ) {
1330
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parents:
diff changeset
216 printf("okay\n");
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parents:
diff changeset
217 } else {
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
218 printf("failed\n");
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
219 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
220 printf("Setting FIRST=NOVALUE in the environment... ");
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
221 fflush(stdout);
1341
d02b552e5304 Configure dynamically generates SDL_config.h
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diff changeset
222 if ( SDL_putenv("FIRST=NOVALUE") == 0 ) {
1330
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diff changeset
223 printf("okay\n");
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
224 } else {
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
225 printf("failed\n");
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
226 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
227 printf("Getting FIRST from the environment... ");
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
228 fflush(stdout);
1341
d02b552e5304 Configure dynamically generates SDL_config.h
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diff changeset
229 value = SDL_getenv("FIRST");
d02b552e5304 Configure dynamically generates SDL_config.h
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parents: 1336
diff changeset
230 if ( value && (SDL_strcmp(value, "NOVALUE") == 0) ) {
1330
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parents:
diff changeset
231 printf("okay\n");
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
232 } else {
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
233 printf("failed\n");
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
234 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
235 printf("Checking for non-existent variable... ");
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
236 fflush(stdout);
1341
d02b552e5304 Configure dynamically generates SDL_config.h
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parents: 1336
diff changeset
237 if ( ! SDL_getenv("EXISTS") ) {
1330
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parents:
diff changeset
238 printf("okay\n");
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
239 } else {
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
240 printf("failed\n");
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
241 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
242 return(0);
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
243 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
244 #endif /* TEST_MAIN */
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
245