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annotate src/stdlib/SDL_getenv.c @ 1358:c71e05b4dc2e

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More header massaging... works great on Windows. ;-)
author Sam Lantinga <slouken@libsdl.org>
date Fri, 10 Feb 2006 06:48:43 +0000
parents 22f39393668a
children c0a74f199ecf
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
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22f39393668a Fixed build problem with SDL_string.c
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23 #include "SDL_stdinc.h"
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24
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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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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_strcpy(SDL_envmem, variable);
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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 = (char *)SDL_malloc(SDL_strlen(variable)+1);
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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 SDL_strcpy(new_variable, variable);
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119
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120 /* Actually put it into the environment */
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121 added = 0;
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122 i = 0;
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123 if ( SDL_env ) {
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124 /* Check to see if it's already there... */
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125 len = (value - name);
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126 for ( ; SDL_env[i]; ++i ) {
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127 if ( SDL_strncmp(SDL_env[i], name, len) == 0 ) {
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128 break;
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129 }
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130 }
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131 /* If we found it, just replace the entry */
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132 if ( SDL_env[i] ) {
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133 SDL_free(SDL_env[i]);
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134 SDL_env[i] = new_variable;
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135 added = 1;
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diff changeset
136 }
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137 }
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diff changeset
138
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139 /* Didn't find it in the environment, expand and add */
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diff changeset
140 if ( ! added ) {
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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diff changeset
141 new_env = SDL_realloc(SDL_env, (i+2)*sizeof(char *));
1330
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142 if ( new_env ) {
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143 SDL_env = new_env;
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diff changeset
144 SDL_env[i++] = new_variable;
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diff changeset
145 SDL_env[i++] = (char *)0;
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parents:
diff changeset
146 added = 1;
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parents:
diff changeset
147 } else {
1341
d02b552e5304 Configure dynamically generates SDL_config.h
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diff changeset
148 SDL_free(new_variable);
1330
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149 }
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150 }
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diff changeset
151 return (added ? 0 : -1);
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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152 }
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153
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154 /* Retrieve a variable named "name" from the environment */
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diff changeset
155 char *SDL_getenv(const char *name)
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parents:
diff changeset
156 {
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
157 int len, i;
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
158 char *value;
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diff changeset
159
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diff changeset
160 value = (char *)0;
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diff changeset
161 if ( SDL_env ) {
1341
d02b552e5304 Configure dynamically generates SDL_config.h
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parents: 1336
diff changeset
162 len = SDL_strlen(name);
1330
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diff changeset
163 for ( i=0; SDL_env[i] && !value; ++i ) {
1341
d02b552e5304 Configure dynamically generates SDL_config.h
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parents: 1336
diff changeset
164 if ( (SDL_strncmp(SDL_env[i], name, len) == 0) &&
1330
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diff changeset
165 (SDL_env[i][len] == '=') ) {
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parents:
diff changeset
166 value = &SDL_env[i][len+1];
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parents:
diff changeset
167 }
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parents:
diff changeset
168 }
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parents:
diff changeset
169 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
170 return value;
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
171 }
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172
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diff changeset
173 #endif /* WIN32 */
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174
1331
1cbaeee565b1 A few fixes to get this building on Linux again
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parents: 1330
diff changeset
175 #endif /* !HAVE_GETENV */
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176
1330
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diff changeset
177 #ifdef TEST_MAIN
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diff changeset
178 #include <stdio.h>
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179
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diff changeset
180 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
181 {
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diff changeset
182 char *value;
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diff changeset
183
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diff changeset
184 printf("Checking for non-existent variable... ");
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diff changeset
185 fflush(stdout);
1341
d02b552e5304 Configure dynamically generates SDL_config.h
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diff changeset
186 if ( ! SDL_getenv("EXISTS") ) {
1330
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diff changeset
187 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
188 } else {
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
189 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
190 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
191 printf("Setting FIRST=VALUE1 in the environment... ");
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
192 fflush(stdout);
1341
d02b552e5304 Configure dynamically generates SDL_config.h
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diff changeset
193 if ( SDL_putenv("FIRST=VALUE1") == 0 ) {
1330
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diff changeset
194 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
195 } else {
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
196 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
197 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
198 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
199 fflush(stdout);
1341
d02b552e5304 Configure dynamically generates SDL_config.h
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diff changeset
200 value = SDL_getenv("FIRST");
d02b552e5304 Configure dynamically generates SDL_config.h
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diff changeset
201 if ( value && (SDL_strcmp(value, "VALUE1") == 0) ) {
1330
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parents:
diff changeset
202 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
203 } else {
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
204 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
205 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
206 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
207 fflush(stdout);
1341
d02b552e5304 Configure dynamically generates SDL_config.h
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parents: 1336
diff changeset
208 if ( SDL_putenv("SECOND=VALUE2") == 0 ) {
1330
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parents:
diff changeset
209 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
210 } 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
211 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
212 }
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 printf("Getting SECOND from the environment... ");
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 fflush(stdout);
1341
d02b552e5304 Configure dynamically generates SDL_config.h
Sam Lantinga <slouken@libsdl.org>
parents: 1336
diff changeset
215 value = SDL_getenv("SECOND");
d02b552e5304 Configure dynamically generates SDL_config.h
Sam Lantinga <slouken@libsdl.org>
parents: 1336
diff changeset
216 if ( value && (SDL_strcmp(value, "VALUE2") == 0) ) {
1330
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parents:
diff changeset
217 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
218 } 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
219 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
220 }
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 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
222 fflush(stdout);
1341
d02b552e5304 Configure dynamically generates SDL_config.h
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parents: 1336
diff changeset
223 if ( SDL_putenv("FIRST=NOVALUE") == 0 ) {
1330
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
224 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
225 } 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
226 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
227 }
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 printf("Getting FIRST from the environment... ");
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 fflush(stdout);
1341
d02b552e5304 Configure dynamically generates SDL_config.h
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parents: 1336
diff changeset
230 value = SDL_getenv("FIRST");
d02b552e5304 Configure dynamically generates SDL_config.h
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parents: 1336
diff changeset
231 if ( value && (SDL_strcmp(value, "NOVALUE") == 0) ) {
1330
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
232 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
233 } 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
234 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
235 }
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 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
237 fflush(stdout);
1341
d02b552e5304 Configure dynamically generates SDL_config.h
Sam Lantinga <slouken@libsdl.org>
parents: 1336
diff changeset
238 if ( ! SDL_getenv("EXISTS") ) {
1330
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 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
240 } 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
241 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
242 }
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 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
244 }
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 #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
246