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 #ifdef _WIN32_IE
  36 #include <shlobj.h>
  37 #endif
  38
  39 #include "alMain.h"
  40 #include "compat.h"
  41
  42
  43 typedef struct ConfigEntry {
  44     char *key;
  45     char *value;
  46 } ConfigEntry;
  47
  48 typedef struct ConfigBlock {
  49     ConfigEntry *entries;
  50     unsigned int entryCount;
  51 } ConfigBlock;
  52 static ConfigBlock cfgBlock;
  53
  54
  55 static char *lstrip(char *line)
  56 {
  57     while(isspace(line[0]))
  58         line++;
  59     return line;
  60 }
  61
  62 static char *rstrip(char *line)
  63 {
  64     size_t len = strlen(line);
  65     while(len > 0 && isspace(line[len-1]))
  66         len--;
  67     line[len] = 0;
  68     return line;
  69 }
  70
  71 static int readline(FILE *f, char **output, size_t *maxlen)
  72 {
  73     size_t len = 0;
  74     int c;
  75
  76     while((c=fgetc(f)) != EOF && (c == '\r' || c == '\n'))
  77         ;
  78     if(c == EOF)
  79         return 0;
  80
  81     do {
  82         if(len+1 >= *maxlen)
  83         {
  84             void *temp = NULL;
  85             size_t newmax;
  86
  87             newmax = (*maxlen ? (*maxlen)<<1 : 32);
  88             if(newmax > *maxlen)
  89                 temp = realloc(*output, newmax);
  90             if(!temp)
  91             {
  92                 ERR("Failed to realloc "SZFMT" bytes from "SZFMT"!\n", newmax, *maxlen);
  93                 return 0;
  94             }
  95
  96             *output = temp;
  97             *maxlen = newmax;
  98         }
  99         (*output)[len++] = c;
 100         (*output)[len] = '\0';
 101     } while((c=fgetc(f)) != EOF && c != '\r' && c != '\n');
 102
 103     return 1;
 104 }
 105
 106
 107 static char *expdup(const char *str)
 108 {
 109     char *output = NULL;
 110     size_t maxlen = 0;
 111     size_t len = 0;
 112
 113     while(*str != '\0')
 114     {
 115         const char *addstr;
 116         size_t addstrlen;
 117         size_t i;
 118
 119         if(str[0] != '$')
 120         {
 121             const char *next = strchr(str, '$');
 122             addstr = str;
 123             addstrlen = next ? (size_t)(next-str) : strlen(str);
 124
 125             str += addstrlen;
 126         }
 127         else
 128         {
 129             str++;
 130             if(*str == '$')
 131             {
 132                 const char *next = strchr(str+1, '$');
 133                 addstr = str;
 134                 addstrlen = next ? (size_t)(next-str) : strlen(str);
 135
 136                 str += addstrlen;
 137             }
 138             else
 139             {
 140                 char envname[1024];
 141                 size_t k = 0;
 142
 143                 while((isalnum(*str) || *str == '_') && k < sizeof(envname)-1)
 144                     envname[k++] = *(str++);
 145                 envname[k++] = '\0';
 146
 147                 if((addstr=getenv(envname)) == NULL)
 148                     continue;
 149                 addstrlen = strlen(addstr);
 150             }
 151         }
 152         if(addstrlen == 0)
 153             continue;
 154
 155         if(addstrlen >= maxlen-len)
 156         {
 157             void *temp = NULL;
 158             size_t newmax;
 159
 160             newmax = len+addstrlen+1;
 161             if(newmax > maxlen)
 162                 temp = realloc(output, newmax);
 163             if(!temp)
 164             {
 165                 ERR("Failed to realloc "SZFMT" bytes from "SZFMT"!\n", newmax, maxlen);
 166                 return output;
 167             }
 168
 169             output = temp;
 170             maxlen = newmax;
 171         }
 172
 173         for(i = 0;i < addstrlen;i++)
 174             output[len++] = addstr[i];
 175         output[len] = '\0';
 176     }
 177
 178     return output ? output : calloc(1, 1);
 179 }
 180
 181
 182 static void LoadConfigFromFile(FILE *f)
 183 {
 184     char curSection[128] = "";
 185     char *buffer = NULL;
 186     size_t maxlen = 0;
 187     ConfigEntry *ent;
 188
 189     while(readline(f, &buffer, &maxlen))
 190     {
 191         char *line, *comment;
 192         char key[256] = "";
 193         char value[256] = "";
 194
 195         comment = strchr(buffer, '#');
 196         if(comment) *(comment++) = 0;
 197
 198         line = rstrip(lstrip(buffer));
 199         if(!line[0])
 200             continue;
 201
 202         if(line[0] == '[')
 203         {
 204             char *section = line+1;
 205             char *endsection;
 206
 207             endsection = strchr(section, ']');
 208             if(!endsection || section == endsection || endsection[1] != 0)
 209             {
 210                  ERR("config parse error: bad line \"%s\"\n", line);
 211                  continue;
 212             }
 213             *endsection = 0;
 214
 215             if(strcasecmp(section, "general") == 0)
 216                 curSection[0] = 0;
 217             else
 218             {
 219                 strncpy(curSection, section, sizeof(curSection)-1);
 220                 curSection[sizeof(curSection)-1] = 0;
 221             }
 222
 223             continue;
 224         }
 225
 226         if(sscanf(line, "%255[^=] = \"%255[^\"]\"", key, value) == 2 ||
 227            sscanf(line, "%255[^=] = '%255[^\']'", key, value) == 2 ||
 228            sscanf(line, "%255[^=] = %255[^\n]", key, value) == 2)
 229         {
 230             /* sscanf doesn't handle '' or "" as empty values, so clip it
 231              * manually. */
 232             if(strcmp(value, "\"\"") == 0 || strcmp(value, "''") == 0)
 233                 value[0] = 0;
 234         }
 235         else if(sscanf(line, "%255[^=] %255[=]", key, value) == 2)
 236         {
 237             /* Special case for 'key =' */
 238             value[0] = 0;
 239         }
 240         else
 241         {
 242             ERR("config parse error: malformed option line: \"%s\"\n\n", line);
 243             continue;
 244         }
 245         rstrip(key);
 246
 247         if(curSection[0] != 0)
 248         {
 249             size_t len = strlen(curSection);
 250             memmove(&key[len+1], key, sizeof(key)-1-len);
 251             key[len] = '/';
 252             memcpy(key, curSection, len);
 253         }
 254
 255         /* Check if we already have this option set */
 256         ent = cfgBlock.entries;
 257         while((unsigned int)(ent-cfgBlock.entries) < cfgBlock.entryCount)
 258         {
 259             if(strcasecmp(ent->key, key) == 0)
 260                 break;
 261             ent++;
 262         }
 263
 264         if((unsigned int)(ent-cfgBlock.entries) >= cfgBlock.entryCount)
 265         {
 266             /* Allocate a new option entry */
 267             ent = realloc(cfgBlock.entries, (cfgBlock.entryCount+1)*sizeof(ConfigEntry));
 268             if(!ent)
 269             {
 270                  ERR("config parse error: error reallocating config entries\n");
 271                  continue;
 272             }
 273             cfgBlock.entries = ent;
 274             ent = cfgBlock.entries + cfgBlock.entryCount;
 275             cfgBlock.entryCount++;
 276
 277             ent->key = strdup(key);
 278             ent->value = NULL;
 279         }
 280
 281         free(ent->value);
 282         ent->value = expdup(value);
 283
 284         TRACE("found '%s' = '%s'\n", ent->key, ent->value);
 285     }
 286
 287     free(buffer);
 288 }
 289
 290 #ifdef _WIN32
 291 void ReadALConfig(void)
 292 {
 293     WCHAR buffer[PATH_MAX];
 294     const WCHAR *str;
 295     FILE *f;
 296
 297     if(SHGetSpecialFolderPathW(NULL, buffer, CSIDL_APPDATA, FALSE) != FALSE)
 298     {
 299         size_t p = lstrlenW(buffer);
 300         _snwprintf(buffer+p, PATH_MAX-p, L"\\alsoft.ini");
 301
 302         TRACE("Loading config %ls...\n", buffer);
 303         f = _wfopen(buffer, L"rt");
 304         if(f)
 305         {
 306             LoadConfigFromFile(f);
 307             fclose(f);
 308         }
 309     }
 310
 311     if((str=_wgetenv(L"ALSOFT_CONF")) != NULL && *str)
 312     {
 313         TRACE("Loading config %ls...\n", str);
 314         f = _wfopen(str, L"rt");
 315         if(f)
 316         {
 317             LoadConfigFromFile(f);
 318             fclose(f);
 319         }
 320     }
 321 }
 322 #else
 323 void ReadALConfig(void)
 324 {
 325     char buffer[PATH_MAX];
 326     const char *str;
 327     FILE *f;
 328
 329     str = "/etc/openal/alsoft.conf";
 330
 331     TRACE("Loading config %s...\n", str);
 332     f = al_fopen(str, "r");
 333     if(f)
 334     {
 335         LoadConfigFromFile(f);
 336         fclose(f);
 337     }
 338
 339     if(!(str=getenv("XDG_CONFIG_DIRS")) || str[0] == 0)
 340         str = "/etc/xdg";
 341     strncpy(buffer, str, sizeof(buffer)-1);
 342     buffer[sizeof(buffer)-1] = 0;
 343     /* Go through the list in reverse, since "the order of base directories
 344      * denotes their importance; the first directory listed is the most
 345      * important". Ergo, we need to load the settings from the later dirs
 346      * first so that the settings in the earlier dirs override them.
 347      */
 348     while(1)
 349     {
 350         char *next = strrchr(buffer, ':');
 351         if(next) *(next++) = 0;
 352         else next = buffer;
 353
 354         if(next[0] != '/')
 355             WARN("Ignoring XDG config dir: %s\n", next);
 356         else
 357         {
 358             size_t len = strlen(next);
 359             strncpy(next+len, "/alsoft.conf", buffer+sizeof(buffer)-next-len);
 360             buffer[sizeof(buffer)-1] = 0;
 361
 362             TRACE("Loading config %s...\n", next);
 363             f = al_fopen(next, "r");
 364             if(f)
 365             {
 366                 LoadConfigFromFile(f);
 367                 fclose(f);
 368             }
 369         }
 370         if(next == buffer)
 371             break;
 372     }
 373
 374     if((str=getenv("HOME")) != NULL && *str)
 375     {
 376         snprintf(buffer, sizeof(buffer), "%s/.alsoftrc", str);
 377
 378         TRACE("Loading config %s...\n", buffer);
 379         f = al_fopen(buffer, "r");
 380         if(f)
 381         {
 382             LoadConfigFromFile(f);
 383             fclose(f);
 384         }
 385     }
 386
 387     if((str=getenv("XDG_CONFIG_HOME")) != NULL && str[0] != 0)
 388         snprintf(buffer, sizeof(buffer), "%s/%s", str, "alsoft.conf");
 389     else
 390     {
 391         buffer[0] = 0;
 392         if((str=getenv("HOME")) != NULL && str[0] != 0)
 393             snprintf(buffer, sizeof(buffer), "%s/.config/%s", str, "alsoft.conf");
 394     }
 395     if(buffer[0] != 0)
 396     {
 397         TRACE("Loading config %s...\n", buffer);
 398         f = al_fopen(buffer, "r");
 399         if(f)
 400         {
 401             LoadConfigFromFile(f);
 402             fclose(f);
 403         }
 404     }
 405
 406     if((str=getenv("ALSOFT_CONF")) != NULL && *str)
 407     {
 408         TRACE("Loading config %s...\n", str);
 409         f = al_fopen(str, "r");
 410         if(f)
 411         {
 412             LoadConfigFromFile(f);
 413             fclose(f);
 414         }
 415     }
 416 }
 417 #endif
 418
 419 void FreeALConfig(void)
 420 {
 421     unsigned int i;
 422
 423     for(i = 0;i < cfgBlock.entryCount;i++)
 424     {
 425         free(cfgBlock.entries[i].key);
 426         free(cfgBlock.entries[i].value);
 427     }
 428     free(cfgBlock.entries);
 429 }
 430
 431 const char *GetConfigValue(const char *blockName, const char *keyName, const char *def)
 432 {
 433     unsigned int i;
 434     char key[256];
 435
 436     if(!keyName)
 437         return def;
 438
 439     if(blockName && strcasecmp(blockName, "general") != 0)
 440         snprintf(key, sizeof(key), "%s/%s", blockName, keyName);
 441     else
 442     {
 443         strncpy(key, keyName, sizeof(key)-1);
 444         key[sizeof(key)-1] = 0;
 445     }
 446
 447     for(i = 0;i < cfgBlock.entryCount;i++)
 448     {
 449         if(strcasecmp(cfgBlock.entries[i].key, key) == 0)
 450         {
 451             TRACE("Found %s = \"%s\"\n", key, cfgBlock.entries[i].value);
 452             if(cfgBlock.entries[i].value[0])
 453                 return cfgBlock.entries[i].value;
 454             return def;
 455         }
 456     }
 457
 458     TRACE("Key %s not found\n", key);
 459     return def;
 460 }
 461
 462 int ConfigValueExists(const char *blockName, const char *keyName)
 463 {
 464     const char *val = GetConfigValue(blockName, keyName, "");
 465     return !!val[0];
 466 }
 467
 468 int ConfigValueStr(const char *blockName, const char *keyName, const char **ret)
 469 {
 470     const char *val = GetConfigValue(blockName, keyName, "");
 471     if(!val[0]) return 0;
 472
 473     *ret = val;
 474     return 1;
 475 }
 476
 477 int ConfigValueInt(const char *blockName, const char *keyName, int *ret)
 478 {
 479     const char *val = GetConfigValue(blockName, keyName, "");
 480     if(!val[0]) return 0;
 481
 482     *ret = strtol(val, NULL, 0);
 483     return 1;
 484 }
 485
 486 int ConfigValueUInt(const char *blockName, const char *keyName, unsigned int *ret)
 487 {
 488     const char *val = GetConfigValue(blockName, keyName, "");
 489     if(!val[0]) return 0;
 490
 491     *ret = strtoul(val, NULL, 0);
 492     return 1;
 493 }
 494
 495 int ConfigValueFloat(const char *blockName, const char *keyName, float *ret)
 496 {
 497     const char *val = GetConfigValue(blockName, keyName, "");
 498     if(!val[0]) return 0;
 499
 500 #ifdef HAVE_STRTOF
 501     *ret = strtof(val, NULL);
 502 #else
 503     *ret = (float)strtod(val, NULL);
 504 #endif
 505     return 1;
 506 }
 507
 508 int GetConfigValueBool(const char *blockName, const char *keyName, int def)
 509 {
 510     const char *val = GetConfigValue(blockName, keyName, "");
 511
 512     if(!val[0]) return !!def;
 513     return (strcasecmp(val, "true") == 0 || strcasecmp(val, "yes") == 0 ||
 514             strcasecmp(val, "on") == 0 || atoi(val) != 0);
 515 }