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annotate src/stdlib/SDL_getenv.c @ 3581:15eea7a1fa97

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Implemented SDL_setenv(), moved SDL_putenv() to compat. Fixes Bugzilla #779.
author Ryan C. Gordon <icculus@icculus.org>
date Wed, 16 Dec 2009 10:59:51 +0000
parents 99210400e8b9
children 65f66674b7fb
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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99210400e8b9 Updated copyright date
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3 Copyright (C) 1997-2009 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 /* Allocate memory for the variable */
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97 len = SDL_strlen(name) + SDL_strlen(value) + 2;
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98 new_variable = (char *) SDL_malloc(len);
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99 if (!new_variable) {
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100 return (-1);
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101 }
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102
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103 SDL_snprintf(new_variable, len, "%s=%s", name, value);
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104 value = new_variable + SDL_strlen(name) + 1;
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105 name = new_variable;
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106
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107 /* Actually put it into the environment */
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108 added = 0;
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109 i = 0;
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110 if (SDL_env) {
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111 /* Check to see if it's already there... */
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112 len = (value - name);
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113 for (; SDL_env[i]; ++i) {
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114 if (SDL_strncmp(SDL_env[i], name, len) == 0) {
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115 break;
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116 }
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117 }
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118 /* If we found it, just replace the entry */
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119 if (SDL_env[i]) {
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120 if (!overwrite) {
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121 SDL_free(new_variable);
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122 return 0;
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123 }
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124 SDL_free(SDL_env[i]);
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125 SDL_env[i] = new_variable;
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126 added = 1;
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127 }
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128 }
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129
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130 /* Didn't find it in the environment, expand and add */
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131 if (!added) {
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132 new_env = SDL_realloc(SDL_env, (i + 2) * sizeof(char *));
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133 if (new_env) {
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134 SDL_env = new_env;
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135 SDL_env[i++] = new_variable;
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136 SDL_env[i++] = (char *) 0;
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diff changeset
137 added = 1;
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diff changeset
138 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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139 SDL_free(new_variable);
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140 }
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diff changeset
141 }
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142 return (added ? 0 : -1);
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143 }
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diff changeset
144
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diff changeset
145 /* Retrieve a variable named "name" from the environment */
1895
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146 char *
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
147 SDL_getenv(const char *name)
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148 {
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diff changeset
149 int len, i;
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150 char *value;
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151
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152 value = (char *) 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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153 if (SDL_env) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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154 len = SDL_strlen(name);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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155 for (i = 0; SDL_env[i] && !value; ++i) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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156 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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157 (SDL_env[i][len] == '=')) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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158 value = &SDL_env[i][len + 1];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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159 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
160 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
161 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
162 return value;
1330
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163 }
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diff changeset
164
1402
d910939febfa Use consistent identifiers for the various platforms we support.
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165 #endif /* __WIN32__ */
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166
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167 #endif /* !HAVE_GETENV */
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168
3581
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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diff changeset
169
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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170 /* We have a real environment table, but no real setenv? Fake it w/ putenv. */
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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171 #if (defined(HAVE_GETENV) && defined(HAVE_PUTENV) && !defined(HAVE_SETENV))
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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172 int
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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173 SDL_setenv(const char *name, const char *value, int overwrite)
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diff changeset
174 {
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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diff changeset
175 size_t len;
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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diff changeset
176 char *new_variable;
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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diff changeset
177
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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diff changeset
178 if (getenv(name) != NULL) {
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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diff changeset
179 if (overwrite) {
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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diff changeset
180 unsetenv(name);
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
Ryan C. Gordon <icculus@icculus.org>
parents: 2859
diff changeset
181 } else {
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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diff changeset
182 return 0; /* leave the existing one there. */
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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diff changeset
183 }
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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diff changeset
184 }
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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diff changeset
185
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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parents: 2859
diff changeset
186 /* 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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diff changeset
187 len = SDL_strlen(name) + SDL_strlen(value) + 2;
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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188 new_variable = (char *) SDL_malloc(len);
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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diff changeset
189 if (!new_variable) {
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
190 return (-1);
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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parents: 2859
diff changeset
191 }
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
192
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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diff changeset
193 SDL_snprintf(new_variable, len, "%s=%s", name, value);
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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diff changeset
194 return putenv(new_variable);
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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diff changeset
195 }
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
196 #endif
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
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diff changeset
197
15eea7a1fa97 Implemented SDL_setenv(), moved SDL_putenv() to compat.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
198
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199 #ifdef TEST_MAIN
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200 #include <stdio.h>
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diff changeset
201
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202 int
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
203 main(int argc, char *argv[])
1330
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204 {
1895
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205 char *value;
1330
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diff changeset
206
1895
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diff changeset
207 printf("Checking for non-existent variable... ");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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208 fflush(stdout);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
209 if (!SDL_getenv("EXISTS")) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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210 printf("okay\n");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
211 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
212 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
213 }
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
214 printf("Setting FIRST=VALUE1 in the environment... ");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
215 fflush(stdout);
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
216 if (SDL_putenv("FIRST=VALUE1") == 0) {
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
217 printf("okay\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
218 } else {
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 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
220 }
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
221 printf("Getting FIRST from the environment... ");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
222 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
223 value = SDL_getenv("FIRST");
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
224 if (value && (SDL_strcmp(value, "VALUE1") == 0)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1472
diff changeset
225 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
226 } else {
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
227 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
228 }
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
229 printf("Setting SECOND=VALUE2 in the environment... ");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
230 fflush(stdout);
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
231 if (SDL_putenv("SECOND=VALUE2") == 0) {
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
232 printf("okay\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
233 } else {
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
234 printf("failed\n");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1472
diff changeset
235 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1472
diff changeset
236 printf("Getting SECOND from the environment... ");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1472
diff changeset
237 fflush(stdout);
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
238 value = SDL_getenv("SECOND");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1472
diff changeset
239 if (value && (SDL_strcmp(value, "VALUE2") == 0)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1472
diff changeset
240 printf("okay\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
241 } else {
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
242 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
243 }
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
244 printf("Setting FIRST=NOVALUE in the environment... ");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
245 fflush(stdout);
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
246 if (SDL_putenv("FIRST=NOVALUE") == 0) {
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
247 printf("okay\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
248 } else {
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
249 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
250 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1472
diff changeset
251 printf("Getting FIRST from the environment... ");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1472
diff changeset
252 fflush(stdout);
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
253 value = SDL_getenv("FIRST");
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
254 if (value && (SDL_strcmp(value, "NOVALUE") == 0)) {
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
255 printf("okay\n");
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256 } else {
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257 printf("failed\n");
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258 }
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259 printf("Checking for non-existent variable... ");
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260 fflush(stdout);
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261 if (!SDL_getenv("EXISTS")) {
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262 printf("okay\n");
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263 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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264 printf("failed\n");
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265 }
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266 return (0);
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450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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267 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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268 #endif /* TEST_MAIN */
1895
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269 /* vi: set ts=4 sw=4 expandtab: */