Mercurial > sdl-ios-xcode
annotate src/SDL_getenv.c @ 1269:905d5b482f2a
Some explanation on why SDL_RWFromFP doesn't always work on Win32
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 26 Jan 2006 06:10:34 +0000 |
| parents | f098b247299d |
| children | 05d5d36b71f4 |
| rev | line source |
|---|---|
| 249 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2004 (Happy New Year!)
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3 Copyright (C) 1997-2004 Sam Lantinga |
| 249 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 9 | |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
252
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Updated the source with the correct e-mail address
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20 slouken@libsdl.org |
| 249 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 0 | 27 |
| 28 /* Not all environments have a working getenv()/putenv() */ | |
| 29 | |
| 30 #ifdef TEST_MAIN | |
| 31 #define NEED_SDL_GETENV | |
| 32 #endif | |
| 33 | |
| 34 #include "SDL_getenv.h" | |
| 35 | |
| 36 #ifdef NEED_SDL_GETENV | |
| 37 | |
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38 #ifdef WIN32 |
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39 |
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40 #define WIN32_LEAN_AND_MEAN |
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41 #include <windows.h> |
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42 #include <malloc.h> |
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43 #include <string.h> |
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44 |
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45 /* Note this isn't thread-safe! */ |
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46 |
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47 static char *SDL_envmem = NULL; /* Ugh, memory leak */ |
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48 static DWORD SDL_envmemlen = 0; |
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49 |
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50 /* Put a variable of the form "name=value" into the environment */ |
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51 int SDL_putenv(const char *variable) |
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52 { |
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53 DWORD bufferlen; |
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54 char *value; |
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55 const char *sep; |
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56 |
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57 sep = strchr(variable, '='); |
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58 if ( sep == NULL ) { |
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59 return -1; |
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60 } |
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61 bufferlen = strlen(variable)+1; |
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62 if ( bufferlen > SDL_envmemlen ) { |
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63 char *newmem = (char *)realloc(SDL_envmem, bufferlen); |
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64 if ( newmem == NULL ) { |
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65 return -1; |
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66 } |
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67 SDL_envmem = newmem; |
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68 SDL_envmemlen = bufferlen; |
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69 } |
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70 strcpy(SDL_envmem, variable); |
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71 value = SDL_envmem + (sep - variable); |
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72 *value++ = '\0'; |
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73 if ( !SetEnvironmentVariable(SDL_envmem, *value ? value : NULL) ) { |
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74 return -1; |
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75 } |
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76 return 0; |
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77 } |
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78 |
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79 /* Retrieve a variable named "name" from the environment */ |
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80 char *SDL_getenv(const char *name) |
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81 { |
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82 DWORD bufferlen; |
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83 |
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84 bufferlen = GetEnvironmentVariable(name, SDL_envmem, SDL_envmemlen); |
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85 if ( bufferlen == 0 ) { |
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86 return NULL; |
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87 } |
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88 if ( bufferlen > SDL_envmemlen ) { |
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89 char *newmem = (char *)realloc(SDL_envmem, bufferlen); |
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90 if ( newmem == NULL ) { |
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91 return NULL; |
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92 } |
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93 SDL_envmem = newmem; |
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94 SDL_envmemlen = bufferlen; |
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95 GetEnvironmentVariable(name, SDL_envmem, SDL_envmemlen); |
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96 } |
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97 return SDL_envmem; |
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98 } |
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99 |
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100 #else /* roll our own */ |
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101 |
| 0 | 102 #include <stdlib.h> |
| 103 #include <string.h> | |
| 104 | |
| 105 static char **SDL_env = (char **)0; | |
| 106 | |
| 107 /* Put a variable of the form "name=value" into the environment */ | |
| 108 int SDL_putenv(const char *variable) | |
| 109 { | |
| 110 const char *name, *value; | |
| 111 int added; | |
| 112 int len, i; | |
| 113 char **new_env; | |
| 114 char *new_variable; | |
| 115 | |
| 116 /* A little error checking */ | |
| 117 if ( ! variable ) { | |
| 118 return(-1); | |
| 119 } | |
| 120 name = variable; | |
| 121 for ( value=variable; *value && (*value != '='); ++value ) { | |
| 122 /* Keep looking for '=' */ ; | |
| 123 } | |
| 124 if ( *value ) { | |
| 125 ++value; | |
| 126 } else { | |
| 127 return(-1); | |
| 128 } | |
| 129 | |
| 130 /* Allocate memory for the variable */ | |
| 131 new_variable = (char *)malloc(strlen(variable)+1); | |
| 132 if ( ! new_variable ) { | |
| 133 return(-1); | |
| 134 } | |
| 135 strcpy(new_variable, variable); | |
| 136 | |
| 137 /* Actually put it into the environment */ | |
| 138 added = 0; | |
| 139 i = 0; | |
| 140 if ( SDL_env ) { | |
| 141 /* Check to see if it's already there... */ | |
| 142 len = (value - name); | |
| 143 for ( ; SDL_env[i]; ++i ) { | |
| 144 if ( strncmp(SDL_env[i], name, len) == 0 ) { | |
| 145 break; | |
| 146 } | |
| 147 } | |
| 148 /* If we found it, just replace the entry */ | |
| 149 if ( SDL_env[i] ) { | |
| 150 free(SDL_env[i]); | |
| 151 SDL_env[i] = new_variable; | |
| 152 added = 1; | |
| 153 } | |
| 154 } | |
| 155 | |
| 156 /* Didn't find it in the environment, expand and add */ | |
| 157 if ( ! added ) { | |
| 158 new_env = realloc(SDL_env, (i+2)*sizeof(char *)); | |
| 159 if ( new_env ) { | |
| 160 SDL_env = new_env; | |
| 161 SDL_env[i++] = new_variable; | |
| 162 SDL_env[i++] = (char *)0; | |
| 163 added = 1; | |
| 164 } else { | |
| 165 free(new_variable); | |
| 166 } | |
| 167 } | |
| 168 return (added ? 0 : -1); | |
| 169 } | |
| 170 | |
| 171 /* Retrieve a variable named "name" from the environment */ | |
| 172 char *SDL_getenv(const char *name) | |
| 173 { | |
| 174 int len, i; | |
| 175 char *value; | |
| 176 | |
| 177 value = (char *)0; | |
| 178 if ( SDL_env ) { | |
| 179 len = strlen(name); | |
| 180 for ( i=0; SDL_env[i] && !value; ++i ) { | |
| 181 if ( (strncmp(SDL_env[i], name, len) == 0) && | |
| 182 (SDL_env[i][len] == '=') ) { | |
| 183 value = &SDL_env[i][len+1]; | |
| 184 } | |
| 185 } | |
| 186 } | |
| 187 return value; | |
| 188 } | |
| 189 | |
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190 #endif /* WIN32 */ |
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191 |
| 0 | 192 #endif /* NEED_GETENV */ |
| 193 | |
| 194 #ifdef TEST_MAIN | |
| 195 #include <stdio.h> | |
| 196 | |
| 197 int main(int argc, char *argv[]) | |
| 198 { | |
| 199 char *value; | |
| 200 | |
| 201 printf("Checking for non-existent variable... "); | |
| 202 fflush(stdout); | |
| 203 if ( ! getenv("EXISTS") ) { | |
| 204 printf("okay\n"); | |
| 205 } else { | |
| 206 printf("failed\n"); | |
| 207 } | |
| 208 printf("Setting FIRST=VALUE1 in the environment... "); | |
| 209 fflush(stdout); | |
| 210 if ( putenv("FIRST=VALUE1") == 0 ) { | |
| 211 printf("okay\n"); | |
| 212 } else { | |
| 213 printf("failed\n"); | |
| 214 } | |
| 215 printf("Getting FIRST from the environment... "); | |
| 216 fflush(stdout); | |
| 217 value = getenv("FIRST"); | |
| 218 if ( value && (strcmp(value, "VALUE1") == 0) ) { | |
| 219 printf("okay\n"); | |
| 220 } else { | |
| 221 printf("failed\n"); | |
| 222 } | |
| 223 printf("Setting SECOND=VALUE2 in the environment... "); | |
| 224 fflush(stdout); | |
| 225 if ( putenv("SECOND=VALUE2") == 0 ) { | |
| 226 printf("okay\n"); | |
| 227 } else { | |
| 228 printf("failed\n"); | |
| 229 } | |
| 230 printf("Getting SECOND from the environment... "); | |
| 231 fflush(stdout); | |
| 232 value = getenv("SECOND"); | |
| 233 if ( value && (strcmp(value, "VALUE2") == 0) ) { | |
| 234 printf("okay\n"); | |
| 235 } else { | |
| 236 printf("failed\n"); | |
| 237 } | |
| 238 printf("Setting FIRST=NOVALUE in the environment... "); | |
| 239 fflush(stdout); | |
| 240 if ( putenv("FIRST=NOVALUE") == 0 ) { | |
| 241 printf("okay\n"); | |
| 242 } else { | |
| 243 printf("failed\n"); | |
| 244 } | |
| 245 printf("Getting FIRST from the environment... "); | |
| 246 fflush(stdout); | |
| 247 value = getenv("FIRST"); | |
| 248 if ( value && (strcmp(value, "NOVALUE") == 0) ) { | |
| 249 printf("okay\n"); | |
| 250 } else { | |
| 251 printf("failed\n"); | |
| 252 } | |
| 253 printf("Checking for non-existent variable... "); | |
| 254 fflush(stdout); | |
| 255 if ( ! getenv("EXISTS") ) { | |
| 256 printf("okay\n"); | |
| 257 } else { | |
| 258 printf("failed\n"); | |
| 259 } | |
| 260 return(0); | |
| 261 } | |
| 262 #endif /* TEST_MAIN */ | |
| 263 |