Alc/alcConfig.c

   1 /**
   2  * OpenAL cross platform audio library
   3  * Copyright (C) 1999-2007 by authors.
   4  * This library is free software; you can redistribute it and/or
   5  *  modify it under the terms of the GNU Library General Public
   6  *  License as published by the Free Software Foundation; either
   7  *  version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *  Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  *  License along with this library; if not, write to the
  16  *  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  *  Boston, MA  02111-1307, USA.
  18  * Or go to http://www.gnu.org/copyleft/lgpl.html
  19  */
  20
  21 #ifdef _WIN32
  22 #ifdef __MINGW32__
  23 #define _WIN32_IE 0x501
  24 #else
  25 #define _WIN32_IE 0x400
  26 #endif
  27 #endif
  28
  29 #include "config.h"
  30
  31 #include <stdlib.h>
  32 #include <stdio.h>
  33 #include <ctype.h>
  34 #include <string.h>
  35
  36 #include "alMain.h"
  37
  38 #ifdef _WIN32_IE
  39 #include <shlobj.h>
  40 #endif
  41
  42 typedef struct ConfigEntry {
  43     char *key;
  44     char *value;
  45 } ConfigEntry;
  46
  47 typedef struct ConfigBlock {
  48     char *name;
  49     ConfigEntry *entries;
  50     unsigned int entryCount;
  51 } ConfigBlock;
  52
  53 static ConfigBlock *cfgBlocks;
  54 static unsigned int cfgCount;
  55
  56 static char buffer[1024];
  57
  58 static void LoadConfigFromFile(FILE *f)
  59 {
  60     ConfigBlock *curBlock = cfgBlocks;
  61     ConfigEntry *ent;
  62
  63     while(fgets(buffer, sizeof(buffer), f))
  64     {
  65         int i = 0;
  66
  67         while(isspace(buffer[i]))
  68             i++;
  69         if(!buffer[i] || buffer[i] == '#')
  70             continue;
  71
  72         memmove(buffer, buffer+i, strlen(buffer+i)+1);
  73
  74         if(buffer[0] == '[')
  75         {
  76             ConfigBlock *nextBlock;
  77             unsigned int i;
  78
  79             i = 1;
  80             while(buffer[i] && buffer[i] != ']')
  81                 i++;
  82
  83             if(!buffer[i])
  84             {
  85                  ERR("config parse error: bad line \"%s\"\n", buffer);
  86                  continue;
  87             }
  88             buffer[i] = 0;
  89
  90             do {
  91                 i++;
  92                 if(buffer[i] && !isspace(buffer[i]))
  93                 {
  94                     if(buffer[i] != '#')
  95                         WARN("config warning: extra data after block: \"%s\"\n", buffer+i);
  96                     break;
  97                 }
  98             } while(buffer[i]);
  99
 100             nextBlock = NULL;
 101             for(i = 0;i < cfgCount;i++)
 102             {
 103                 if(strcasecmp(cfgBlocks[i].name, buffer+1) == 0)
 104                 {
 105                     nextBlock = cfgBlocks+i;
 106                     TRACE("found block '%s'\n", nextBlock->name);
 107                     break;
 108                 }
 109             }
 110
 111             if(!nextBlock)
 112             {
 113                 nextBlock = realloc(cfgBlocks, (cfgCount+1)*sizeof(ConfigBlock));
 114                 if(!nextBlock)
 115                 {
 116                      ERR("config parse error: error reallocating config blocks\n");
 117                      continue;
 118                 }
 119                 cfgBlocks = nextBlock;
 120                 nextBlock = cfgBlocks+cfgCount;
 121                 cfgCount++;
 122
 123                 nextBlock->name = strdup(buffer+1);
 124                 nextBlock->entries = NULL;
 125                 nextBlock->entryCount = 0;
 126
 127                 TRACE("found new block '%s'\n", nextBlock->name);
 128             }
 129             curBlock = nextBlock;
 130             continue;
 131         }
 132
 133         /* Look for the option name */
 134         i = 0;
 135         while(buffer[i] && buffer[i] != '#' && buffer[i] != '=' &&
 136               !isspace(buffer[i]))
 137             i++;
 138
 139         if(!buffer[i] || buffer[i] == '#' || i == 0)
 140         {
 141             ERR("config parse error: malformed option line: \"%s\"\n", buffer);
 142             continue;
 143         }
 144
 145         /* Seperate the option */
 146         if(buffer[i] != '=')
 147         {
 148             buffer[i++] = 0;
 149
 150             while(isspace(buffer[i]))
 151                 i++;
 152             if(buffer[i] != '=')
 153             {
 154                 ERR("config parse error: option without a value: \"%s\"\n", buffer);
 155                 continue;
 156             }
 157         }
 158         /* Find the start of the value */
 159         buffer[i++] = 0;
 160         while(isspace(buffer[i]))
 161             i++;
 162
 163         /* Check if we already have this option set */
 164         ent = curBlock->entries;
 165         while((unsigned int)(ent-curBlock->entries) < curBlock->entryCount)
 166         {
 167             if(strcasecmp(ent->key, buffer) == 0)
 168                 break;
 169             ent++;
 170         }
 171
 172         if((unsigned int)(ent-curBlock->entries) >= curBlock->entryCount)
 173         {
 174             /* Allocate a new option entry */
 175             ent = realloc(curBlock->entries, (curBlock->entryCount+1)*sizeof(ConfigEntry));
 176             if(!ent)
 177             {
 178                  ERR("config parse error: error reallocating config entries\n");
 179                  continue;
 180             }
 181             curBlock->entries = ent;
 182             ent = curBlock->entries + curBlock->entryCount;
 183             curBlock->entryCount++;
 184
 185             ent->key = strdup(buffer);
 186             ent->value = NULL;
 187         }
 188
 189         /* Look for the end of the line (Null term, new-line, or #-symbol) and
 190            eat up the trailing whitespace */
 191         memmove(buffer, buffer+i, strlen(buffer+i)+1);
 192
 193         i = 0;
 194         while(buffer[i] && buffer[i] != '#' && buffer[i] != '\n')
 195             i++;
 196         do {
 197             i--;
 198         } while(i >= 0 && isspace(buffer[i]));
 199         buffer[++i] = 0;
 200
 201         free(ent->value);
 202         ent->value = strdup(buffer);
 203
 204         TRACE("found '%s' = '%s'\n", ent->key, ent->value);
 205     }
 206 }
 207
 208 void ReadALConfig(void)
 209 {
 210     const char *str;
 211     FILE *f;
 212
 213     cfgBlocks = calloc(1, sizeof(ConfigBlock));
 214     cfgBlocks->name = strdup("general");
 215     cfgCount = 1;
 216
 217 #ifdef _WIN32
 218     if(SHGetSpecialFolderPathA(NULL, buffer, CSIDL_APPDATA, FALSE) != FALSE)
 219     {
 220         size_t p = strlen(buffer);
 221         snprintf(buffer+p, sizeof(buffer)-p, "\\alsoft.ini");
 222         f = fopen(buffer, "rt");
 223         if(f)
 224         {
 225             LoadConfigFromFile(f);
 226             fclose(f);
 227         }
 228     }
 229 #else
 230     f = fopen("/etc/openal/alsoft.conf", "r");
 231     if(f)
 232     {
 233         LoadConfigFromFile(f);
 234         fclose(f);
 235     }
 236     if((str=getenv("HOME")) != NULL && *str)
 237     {
 238         snprintf(buffer, sizeof(buffer), "%s/.alsoftrc", str);
 239         f = fopen(buffer, "r");
 240         if(f)
 241         {
 242             LoadConfigFromFile(f);
 243             fclose(f);
 244         }
 245     }
 246 #endif
 247     if((str=getenv("ALSOFT_CONF")) != NULL && *str)
 248     {
 249         f = fopen(str, "r");
 250         if(f)
 251         {
 252             LoadConfigFromFile(f);
 253             fclose(f);
 254         }
 255     }
 256 }
 257
 258 void FreeALConfig(void)
 259 {
 260     unsigned int i;
 261
 262     for(i = 0;i < cfgCount;i++)
 263     {
 264         unsigned int j;
 265         for(j = 0;j < cfgBlocks[i].entryCount;j++)
 266         {
 267            free(cfgBlocks[i].entries[j].key);
 268            free(cfgBlocks[i].entries[j].value);
 269         }
 270         free(cfgBlocks[i].entries);
 271         free(cfgBlocks[i].name);
 272     }
 273     free(cfgBlocks);
 274     cfgBlocks = NULL;
 275     cfgCount = 0;
 276 }
 277
 278 const char *GetConfigValue(const char *blockName, const char *keyName, const char *def)
 279 {
 280     unsigned int i, j;
 281
 282     if(!keyName)
 283         return def;
 284
 285     if(!blockName)
 286         blockName = "general";
 287
 288     for(i = 0;i < cfgCount;i++)
 289     {
 290         if(strcasecmp(cfgBlocks[i].name, blockName) != 0)
 291             continue;
 292
 293         for(j = 0;j < cfgBlocks[i].entryCount;j++)
 294         {
 295             if(strcasecmp(cfgBlocks[i].entries[j].key, keyName) == 0)
 296             {
 297                 TRACE("Found %s:%s = \"%s\"\n", blockName, keyName,
 298                       cfgBlocks[i].entries[j].value);
 299                 if(cfgBlocks[i].entries[j].value[0])
 300                     return cfgBlocks[i].entries[j].value;
 301                 return def;
 302             }
 303         }
 304     }
 305
 306     TRACE("Key %s:%s not found\n", blockName, keyName);
 307     return def;
 308 }
 309
 310 int ConfigValueExists(const char *blockName, const char *keyName)
 311 {
 312     const char *val = GetConfigValue(blockName, keyName, "");
 313     return !!val[0];
 314 }
 315
 316 int ConfigValueStr(const char *blockName, const char *keyName, const char **ret)
 317 {
 318     const char *val = GetConfigValue(blockName, keyName, "");
 319     if(!val[0]) return 0;
 320
 321     *ret = val;
 322     return 1;
 323 }
 324
 325 int ConfigValueInt(const char *blockName, const char *keyName, int *ret)
 326 {
 327     const char *val = GetConfigValue(blockName, keyName, "");
 328     if(!val[0]) return 0;
 329
 330     *ret = strtol(val, NULL, 0);
 331     return 1;
 332 }
 333
 334 int ConfigValueUInt(const char *blockName, const char *keyName, unsigned int *ret)
 335 {
 336     const char *val = GetConfigValue(blockName, keyName, "");
 337     if(!val[0]) return 0;
 338
 339     *ret = strtoul(val, NULL, 0);
 340     return 1;
 341 }
 342
 343 int ConfigValueFloat(const char *blockName, const char *keyName, float *ret)
 344 {
 345     const char *val = GetConfigValue(blockName, keyName, "");
 346     if(!val[0]) return 0;
 347
 348 #ifdef HAVE_STRTOF
 349     *ret = strtof(val, NULL);
 350 #else
 351     *ret = (float)strtod(val, NULL);
 352 #endif
 353     return 1;
 354 }
 355
 356 int GetConfigValueBool(const char *blockName, const char *keyName, int def)
 357 {
 358     const char *val = GetConfigValue(blockName, keyName, "");
 359
 360     if(!val[0]) return !!def;
 361     return (strcasecmp(val, "true") == 0 || strcasecmp(val, "yes") == 0 ||
 362             strcasecmp(val, "on") == 0 || atoi(val) != 0);
 363 }