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annotate src/stdlib/SDL_getenv.c @ 3847:3d247fe1c234 SDL-1.2

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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 10 Jul 2006 21:03:59 +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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parents:
diff changeset
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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diff changeset
141 if ( ! added ) {
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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diff changeset
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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diff changeset
145 SDL_env[i++] = new_variable;
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parents:
diff changeset
146 SDL_env[i++] = (char *)0;
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diff changeset
147 added = 1;
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diff changeset
148 } else {
1341
d02b552e5304 Configure dynamically generates SDL_config.h
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diff changeset
149 SDL_free(new_variable);
1330
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150 }
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diff changeset
151 }
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diff changeset
152 return (added ? 0 : -1);
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
153 }
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154
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diff changeset
155 /* Retrieve a variable named "name" from the environment */
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diff changeset
156 char *SDL_getenv(const char *name)
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diff changeset
157 {
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diff changeset
158 int len, i;
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diff changeset
159 char *value;
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diff changeset
160
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diff changeset
161 value = (char *)0;
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diff changeset
162 if ( SDL_env ) {
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d02b552e5304 Configure dynamically generates SDL_config.h
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diff changeset
163 len = SDL_strlen(name);
1330
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diff changeset
164 for ( i=0; SDL_env[i] && !value; ++i ) {
1341
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diff changeset
165 if ( (SDL_strncmp(SDL_env[i], name, len) == 0) &&
1330
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diff changeset
166 (SDL_env[i][len] == '=') ) {
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diff changeset
167 value = &SDL_env[i][len+1];
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diff changeset
168 }
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169 }
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170 }
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diff changeset
171 return value;
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parents:
diff changeset
172 }
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diff changeset
173
1402
d910939febfa Use consistent identifiers for the various platforms we support.
Sam Lantinga <slouken@libsdl.org>
parents: 1379
diff changeset
174 #endif /* __WIN32__ */
1330
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175
1331
1cbaeee565b1 A few fixes to get this building on Linux again
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diff changeset
176 #endif /* !HAVE_GETENV */
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diff changeset
177
1330
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diff changeset
178 #ifdef TEST_MAIN
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diff changeset
179 #include <stdio.h>
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diff changeset
180
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diff changeset
181 int main(int argc, char *argv[])
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
182 {
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diff changeset
183 char *value;
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diff changeset
184
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diff changeset
185 printf("Checking for non-existent variable... ");
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diff changeset
186 fflush(stdout);
1341
d02b552e5304 Configure dynamically generates SDL_config.h
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diff changeset
187 if ( ! SDL_getenv("EXISTS") ) {
1330
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diff changeset
188 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
189 } else {
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
190 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
191 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
192 printf("Setting FIRST=VALUE1 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
193 fflush(stdout);
1341
d02b552e5304 Configure dynamically generates SDL_config.h
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diff changeset
194 if ( SDL_putenv("FIRST=VALUE1") == 0 ) {
1330
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diff changeset
195 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
196 } else {
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
197 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
198 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
199 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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diff changeset
200 fflush(stdout);
1341
d02b552e5304 Configure dynamically generates SDL_config.h
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diff changeset
201 value = SDL_getenv("FIRST");
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diff changeset
202 if ( value && (SDL_strcmp(value, "VALUE1") == 0) ) {
1330
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diff changeset
203 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
204 } else {
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
205 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
206 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
207 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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parents:
diff changeset
208 fflush(stdout);
1341
d02b552e5304 Configure dynamically generates SDL_config.h
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diff changeset
209 if ( SDL_putenv("SECOND=VALUE2") == 0 ) {
1330
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parents:
diff changeset
210 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
211 } 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
212 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
213 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
214 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
215 fflush(stdout);
1341
d02b552e5304 Configure dynamically generates SDL_config.h
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diff changeset
216 value = SDL_getenv("SECOND");
d02b552e5304 Configure dynamically generates SDL_config.h
Sam Lantinga <slouken@libsdl.org>
parents: 1336
diff changeset
217 if ( value && (SDL_strcmp(value, "VALUE2") == 0) ) {
1330
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parents:
diff changeset
218 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
219 } 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
220 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
221 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
222 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
223 fflush(stdout);
1341
d02b552e5304 Configure dynamically generates SDL_config.h
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parents: 1336
diff changeset
224 if ( SDL_putenv("FIRST=NOVALUE") == 0 ) {
1330
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diff changeset
225 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
226 } 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
227 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
228 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
229 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
230 fflush(stdout);
1341
d02b552e5304 Configure dynamically generates SDL_config.h
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parents: 1336
diff changeset
231 value = SDL_getenv("FIRST");
d02b552e5304 Configure dynamically generates SDL_config.h
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parents: 1336
diff changeset
232 if ( value && (SDL_strcmp(value, "NOVALUE") == 0) ) {
1330
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parents:
diff changeset
233 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
234 } 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
235 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
236 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
237 printf("Checking for non-existent variable... ");
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
238 fflush(stdout);
1341
d02b552e5304 Configure dynamically generates SDL_config.h
Sam Lantinga <slouken@libsdl.org>
parents: 1336
diff changeset
239 if ( ! SDL_getenv("EXISTS") ) {
1330
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
240 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
241 } 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
242 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
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 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
245 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
246 #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
247