Alc/helpers.c

   1 /**
   2  * OpenAL cross platform audio library
   3  * Copyright (C) 2011 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 <time.h>
  33 #include <errno.h>
  34 #include <stdarg.h>
  35 #ifdef HAVE_MALLOC_H
  36 #include <malloc.h>
  37 #endif
  38
  39 #ifndef AL_NO_UID_DEFS
  40 #if defined(HAVE_GUIDDEF_H) || defined(HAVE_INITGUID_H)
  41 #define INITGUID
  42 #include <windows.h>
  43 #ifdef HAVE_GUIDDEF_H
  44 #include <guiddef.h>
  45 #else
  46 #include <initguid.h>
  47 #endif
  48
  49 DEFINE_GUID(KSDATAFORMAT_SUBTYPE_PCM,        0x00000001, 0x0000, 0x0010, 0x80,0x00, 0x00,0xaa,0x00,0x38,0x9b,0x71);
  50 DEFINE_GUID(KSDATAFORMAT_SUBTYPE_IEEE_FLOAT, 0x00000003, 0x0000, 0x0010, 0x80,0x00, 0x00,0xaa,0x00,0x38,0x9b,0x71);
  51
  52 DEFINE_GUID(IID_IDirectSoundNotify,   0xb0210783, 0x89cd, 0x11d0, 0xaf,0x08, 0x00,0xa0,0xc9,0x25,0xcd,0x16);
  53
  54 DEFINE_GUID(CLSID_MMDeviceEnumerator, 0xbcde0395, 0xe52f, 0x467c, 0x8e,0x3d, 0xc4,0x57,0x92,0x91,0x69,0x2e);
  55 DEFINE_GUID(IID_IMMDeviceEnumerator,  0xa95664d2, 0x9614, 0x4f35, 0xa7,0x46, 0xde,0x8d,0xb6,0x36,0x17,0xe6);
  56 DEFINE_GUID(IID_IAudioClient,         0x1cb9ad4c, 0xdbfa, 0x4c32, 0xb1,0x78, 0xc2,0xf5,0x68,0xa7,0x03,0xb2);
  57 DEFINE_GUID(IID_IAudioRenderClient,   0xf294acfc, 0x3146, 0x4483, 0xa7,0xbf, 0xad,0xdc,0xa7,0xc2,0x60,0xe2);
  58
  59 #ifdef HAVE_MMDEVAPI
  60 #include <devpropdef.h>
  61 DEFINE_DEVPROPKEY(DEVPKEY_Device_FriendlyName, 0xa45c254e, 0xdf1c, 0x4efd, 0x80,0x20, 0x67,0xd1,0x46,0xa8,0x50,0xe0, 14);
  62 #endif
  63 #endif
  64 #endif /* AL_NO_UID_DEFS */
  65
  66 #ifdef HAVE_DLFCN_H
  67 #include <dlfcn.h>
  68 #endif
  69 #ifdef HAVE_CPUID_H
  70 #include <cpuid.h>
  71 #endif
  72 #ifdef HAVE_SYS_SYSCONF_H
  73 #include <sys/sysconf.h>
  74 #endif
  75 #ifdef HAVE_FLOAT_H
  76 #include <float.h>
  77 #endif
  78 #ifdef HAVE_IEEEFP_H
  79 #include <ieeefp.h>
  80 #endif
  81
  82 #ifdef _WIN32_IE
  83 #include <shlobj.h>
  84 #endif
  85
  86 #include "alMain.h"
  87 #include "alu.h"
  88 #include "atomic.h"
  89 #include "uintmap.h"
  90 #include "vector.h"
  91 #include "alstring.h"
  92 #include "compat.h"
  93 #include "threads.h"
  94
  95
  96 extern inline ALuint NextPowerOf2(ALuint value);
  97 extern inline ALint fastf2i(ALfloat f);
  98 extern inline ALuint fastf2u(ALfloat f);
  99
 100
 101 ALuint CPUCapFlags = 0;
 102
 103
 104 void FillCPUCaps(ALuint capfilter)
 105 {
 106     ALuint caps = 0;
 107
 108 /* FIXME: We really should get this for all available CPUs in case different
 109  * CPUs have different caps (is that possible on one machine?). */
 110 #if defined(HAVE_CPUID_H) && (defined(__i386__) || defined(__x86_64__) || \
 111                               defined(_M_IX86) || defined(_M_X64))
 112     union {
 113         unsigned int regs[4];
 114         char str[sizeof(unsigned int[4])];
 115     } cpuinf[3];
 116
 117     if(!__get_cpuid(0, &cpuinf[0].regs[0], &cpuinf[0].regs[1], &cpuinf[0].regs[2], &cpuinf[0].regs[3]))
 118         ERR("Failed to get CPUID\n");
 119     else
 120     {
 121         unsigned int maxfunc = cpuinf[0].regs[0];
 122         unsigned int maxextfunc = 0;
 123
 124         if(__get_cpuid(0x80000000, &cpuinf[0].regs[0], &cpuinf[0].regs[1], &cpuinf[0].regs[2], &cpuinf[0].regs[3]))
 125             maxextfunc = cpuinf[0].regs[0];
 126         TRACE("Detected max CPUID function: 0x%x (ext. 0x%x)\n", maxfunc, maxextfunc);
 127
 128         TRACE("Vendor ID: \"%.4s%.4s%.4s\"\n", cpuinf[0].str+4, cpuinf[0].str+12, cpuinf[0].str+8);
 129         if(maxextfunc >= 0x80000004 &&
 130            __get_cpuid(0x80000002, &cpuinf[0].regs[0], &cpuinf[0].regs[1], &cpuinf[0].regs[2], &cpuinf[0].regs[3]) &&
 131            __get_cpuid(0x80000003, &cpuinf[1].regs[0], &cpuinf[1].regs[1], &cpuinf[1].regs[2], &cpuinf[1].regs[3]) &&
 132            __get_cpuid(0x80000004, &cpuinf[2].regs[0], &cpuinf[2].regs[1], &cpuinf[2].regs[2], &cpuinf[2].regs[3]))
 133             TRACE("Name: \"%.16s%.16s%.16s\"\n", cpuinf[0].str, cpuinf[1].str, cpuinf[2].str);
 134
 135         if(maxfunc >= 1 &&
 136            __get_cpuid(1, &cpuinf[0].regs[0], &cpuinf[0].regs[1], &cpuinf[0].regs[2], &cpuinf[0].regs[3]))
 137         {
 138             if((cpuinf[0].regs[3]&(1<<25)))
 139             {
 140                 caps |= CPU_CAP_SSE;
 141                 if((cpuinf[0].regs[3]&(1<<26)))
 142                 {
 143                     caps |= CPU_CAP_SSE2;
 144                     if((cpuinf[0].regs[2]&(1<<19)))
 145                         caps |= CPU_CAP_SSE4_1;
 146                 }
 147             }
 148         }
 149     }
 150 #elif defined(HAVE_WINDOWS_H)
 151     HMODULE k32 = GetModuleHandleA("kernel32.dll");
 152     BOOL (WINAPI*IsProcessorFeaturePresent)(DWORD ProcessorFeature);
 153     IsProcessorFeaturePresent = (BOOL(WINAPI*)(DWORD))GetProcAddress(k32, "IsProcessorFeaturePresent");
 154     if(!IsProcessorFeaturePresent)
 155         ERR("IsProcessorFeaturePresent not available; CPU caps not detected\n");
 156     else
 157     {
 158         if(IsProcessorFeaturePresent(PF_XMMI_INSTRUCTIONS_AVAILABLE))
 159         {
 160             caps |= CPU_CAP_SSE;
 161             if(IsProcessorFeaturePresent(PF_XMMI64_INSTRUCTIONS_AVAILABLE))
 162                 caps |= CPU_CAP_SSE2;
 163         }
 164     }
 165 #endif
 166 #ifdef HAVE_NEON
 167     /* Assume Neon support if compiled with it */
 168     caps |= CPU_CAP_NEON;
 169 #endif
 170
 171     TRACE("Extensions:%s%s%s%s%s\n",
 172         ((capfilter&CPU_CAP_SSE)    ? ((caps&CPU_CAP_SSE)    ? " +SSE"    : " -SSE")    : ""),
 173         ((capfilter&CPU_CAP_SSE2)   ? ((caps&CPU_CAP_SSE2)   ? " +SSE2"   : " -SSE2")   : ""),
 174         ((capfilter&CPU_CAP_SSE4_1) ? ((caps&CPU_CAP_SSE4_1) ? " +SSE4.1" : " -SSE4.1") : ""),
 175         ((capfilter&CPU_CAP_NEON)   ? ((caps&CPU_CAP_NEON)   ? " +Neon"   : " -Neon")   : ""),
 176         ((!capfilter) ? " -none-" : "")
 177     );
 178     CPUCapFlags = caps & capfilter;
 179 }
 180
 181
 182 void *al_malloc(size_t alignment, size_t size)
 183 {
 184 #if defined(HAVE_ALIGNED_ALLOC)
 185     size = (size+(alignment-1))&~(alignment-1);
 186     return aligned_alloc(alignment, size);
 187 #elif defined(HAVE_POSIX_MEMALIGN)
 188     void *ret;
 189     if(posix_memalign(&ret, alignment, size) == 0)
 190         return ret;
 191     return NULL;
 192 #elif defined(HAVE__ALIGNED_MALLOC)
 193     return _aligned_malloc(size, alignment);
 194 #else
 195     char *ret = malloc(size+alignment);
 196     if(ret != NULL)
 197     {
 198         *(ret++) = 0x00;
 199         while(((ALintptrEXT)ret&(alignment-1)) != 0)
 200             *(ret++) = 0x55;
 201     }
 202     return ret;
 203 #endif
 204 }
 205
 206 void *al_calloc(size_t alignment, size_t size)
 207 {
 208     void *ret = al_malloc(alignment, size);
 209     if(ret) memset(ret, 0, size);
 210     return ret;
 211 }
 212
 213 void al_free(void *ptr)
 214 {
 215 #if defined(HAVE_ALIGNED_ALLOC) || defined(HAVE_POSIX_MEMALIGN)
 216     free(ptr);
 217 #elif defined(HAVE__ALIGNED_MALLOC)
 218     _aligned_free(ptr);
 219 #else
 220     if(ptr != NULL)
 221     {
 222         char *finder = ptr;
 223         do {
 224             --finder;
 225         } while(*finder == 0x55);
 226         free(finder);
 227     }
 228 #endif
 229 }
 230
 231
 232 void SetMixerFPUMode(FPUCtl *ctl)
 233 {
 234 #ifdef HAVE_FENV_H
 235     fegetenv(STATIC_CAST(fenv_t, ctl));
 236 #if defined(__GNUC__) && defined(HAVE_SSE)
 237     if((CPUCapFlags&CPU_CAP_SSE))
 238         __asm__ __volatile__("stmxcsr %0" : "=m" (*&ctl->sse_state));
 239 #endif
 240
 241 #ifdef FE_TOWARDZERO
 242     fesetround(FE_TOWARDZERO);
 243 #endif
 244 #if defined(__GNUC__) && defined(HAVE_SSE)
 245     if((CPUCapFlags&CPU_CAP_SSE))
 246     {
 247         int sseState = ctl->sse_state;
 248         sseState |= 0x6000; /* set round-to-zero */
 249         sseState |= 0x8000; /* set flush-to-zero */
 250         if((CPUCapFlags&CPU_CAP_SSE2))
 251             sseState |= 0x0040; /* set denormals-are-zero */
 252         __asm__ __volatile__("ldmxcsr %0" : : "m" (*&sseState));
 253     }
 254 #endif
 255
 256 #elif defined(HAVE___CONTROL87_2)
 257
 258     int mode;
 259     __control87_2(0, 0, &ctl->state, NULL);
 260     __control87_2(_RC_CHOP, _MCW_RC, &mode, NULL);
 261 #ifdef HAVE_SSE
 262     if((CPUCapFlags&CPU_CAP_SSE))
 263     {
 264         __control87_2(0, 0, NULL, &ctl->sse_state);
 265         __control87_2(_RC_CHOP|_DN_FLUSH, _MCW_RC|_MCW_DN, NULL, &mode);
 266     }
 267 #endif
 268
 269 #elif defined(HAVE__CONTROLFP)
 270
 271     ctl->state = _controlfp(0, 0);
 272     (void)_controlfp(_RC_CHOP, _MCW_RC);
 273 #endif
 274 }
 275
 276 void RestoreFPUMode(const FPUCtl *ctl)
 277 {
 278 #ifdef HAVE_FENV_H
 279     fesetenv(STATIC_CAST(fenv_t, ctl));
 280 #if defined(__GNUC__) && defined(HAVE_SSE)
 281     if((CPUCapFlags&CPU_CAP_SSE))
 282         __asm__ __volatile__("ldmxcsr %0" : : "m" (*&ctl->sse_state));
 283 #endif
 284
 285 #elif defined(HAVE___CONTROL87_2)
 286
 287     int mode;
 288     __control87_2(ctl->state, _MCW_RC, &mode, NULL);
 289 #ifdef HAVE_SSE
 290     if((CPUCapFlags&CPU_CAP_SSE))
 291         __control87_2(ctl->sse_state, _MCW_RC|_MCW_DN, NULL, &mode);
 292 #endif
 293
 294 #elif defined(HAVE__CONTROLFP)
 295
 296     _controlfp(ctl->state, _MCW_RC);
 297 #endif
 298 }
 299
 300
 301 #ifdef _WIN32
 302
 303 static WCHAR *FromUTF8(const char *str)
 304 {
 305     WCHAR *out = NULL;
 306     int len;
 307
 308     if((len=MultiByteToWideChar(CP_UTF8, 0, str, -1, NULL, 0)) > 0)
 309     {
 310         out = calloc(sizeof(WCHAR), len);
 311         MultiByteToWideChar(CP_UTF8, 0, str, -1, out, len);
 312     }
 313     return out;
 314 }
 315
 316
 317 void *LoadLib(const char *name)
 318 {
 319     HANDLE hdl = NULL;
 320     WCHAR *wname;
 321
 322     wname = FromUTF8(name);
 323     if(!wname)
 324         ERR("Failed to convert UTF-8 filename: \"%s\"\n", name);
 325     else
 326     {
 327         hdl = LoadLibraryW(wname);
 328         free(wname);
 329     }
 330     return hdl;
 331 }
 332 void CloseLib(void *handle)
 333 { FreeLibrary((HANDLE)handle); }
 334 void *GetSymbol(void *handle, const char *name)
 335 {
 336     void *ret;
 337
 338     ret = (void*)GetProcAddress((HANDLE)handle, name);
 339     if(ret == NULL)
 340         ERR("Failed to load %s\n", name);
 341     return ret;
 342 }
 343
 344 WCHAR *strdupW(const WCHAR *str)
 345 {
 346     const WCHAR *n;
 347     WCHAR *ret;
 348     size_t len;
 349
 350     n = str;
 351     while(*n) n++;
 352     len = n - str;
 353
 354     ret = calloc(sizeof(WCHAR), len+1);
 355     if(ret != NULL)
 356         memcpy(ret, str, sizeof(WCHAR)*len);
 357     return ret;
 358 }
 359
 360 FILE *al_fopen(const char *fname, const char *mode)
 361 {
 362     WCHAR *wname=NULL, *wmode=NULL;
 363     FILE *file = NULL;
 364
 365     wname = FromUTF8(fname);
 366     wmode = FromUTF8(mode);
 367     if(!wname)
 368         ERR("Failed to convert UTF-8 filename: \"%s\"\n", fname);
 369     else if(!wmode)
 370         ERR("Failed to convert UTF-8 mode: \"%s\"\n", mode);
 371     else
 372         file = _wfopen(wname, wmode);
 373
 374     free(wname);
 375     free(wmode);
 376
 377     return file;
 378 }
 379
 380 #else
 381
 382 #ifdef HAVE_DLFCN_H
 383
 384 void *LoadLib(const char *name)
 385 {
 386     const char *err;
 387     void *handle;
 388
 389     dlerror();
 390     handle = dlopen(name, RTLD_NOW);
 391     if((err=dlerror()) != NULL)
 392         handle = NULL;
 393     return handle;
 394 }
 395 void CloseLib(void *handle)
 396 { dlclose(handle); }
 397 void *GetSymbol(void *handle, const char *name)
 398 {
 399     const char *err;
 400     void *sym;
 401
 402     dlerror();
 403     sym = dlsym(handle, name);
 404     if((err=dlerror()) != NULL)
 405     {
 406         WARN("Failed to load %s: %s\n", name, err);
 407         sym = NULL;
 408     }
 409     return sym;
 410 }
 411
 412 #endif
 413 #endif
 414
 415
 416 void al_print(const char *type, const char *func, const char *fmt, ...)
 417 {
 418     va_list ap;
 419
 420     va_start(ap, fmt);
 421     fprintf(LogFile, "AL lib: %s %s: ", type, func);
 422     vfprintf(LogFile, fmt, ap);
 423     va_end(ap);
 424
 425     fflush(LogFile);
 426 }
 427
 428 #ifdef _WIN32
 429 static inline int is_slash(int c)
 430 { return (c == '\\' || c == '/'); }
 431
 432 FILE *OpenDataFile(const char *fname, const char *subdir)
 433 {
 434     static const int ids[2] = { CSIDL_APPDATA, CSIDL_COMMON_APPDATA };
 435     WCHAR *wname=NULL, *wsubdir=NULL;
 436     int i;
 437
 438     /* If the path is absolute, open it directly. */
 439     if(fname[0] != '\0' && fname[1] == ':' && is_slash(fname[2]))
 440     {
 441         FILE *f;
 442         if((f=al_fopen(fname, "rb")) != NULL)
 443         {
 444             TRACE("Opened %s\n", fname);
 445             return f;
 446         }
 447         WARN("Could not open %s\n", fname);
 448         return NULL;
 449     }
 450
 451     wname = FromUTF8(fname);
 452     wsubdir = FromUTF8(subdir);
 453     if(!wname)
 454         ERR("Failed to convert UTF-8 filename: \"%s\"\n", fname);
 455     else if(!wsubdir)
 456         ERR("Failed to convert UTF-8 subdir: \"%s\"\n", subdir);
 457     else for(i = 0;i < 2;i++)
 458     {
 459         WCHAR buffer[PATH_MAX];
 460         size_t len;
 461         FILE *f;
 462
 463         if(SHGetSpecialFolderPathW(NULL, buffer, ids[i], FALSE) == FALSE)
 464             continue;
 465
 466         len = lstrlenW(buffer);
 467         if(len > 0 && is_slash(buffer[len-1]))
 468             buffer[--len] = '\0';
 469         _snwprintf(buffer+len, PATH_MAX-len, L"/%ls/%ls", wsubdir, wname);
 470         len = lstrlenW(buffer);
 471         while(len > 0)
 472         {
 473             --len;
 474             if(buffer[len] == '/')
 475                 buffer[len] = '\\';
 476         }
 477
 478         if((f=_wfopen(buffer, L"rb")) != NULL)
 479         {
 480             TRACE("Opened %ls\n", buffer);
 481             return f;
 482         }
 483         WARN("Could not open %ls\n", buffer);
 484     }
 485     free(wname);
 486     free(wsubdir);
 487
 488     return NULL;
 489 }
 490 #else
 491 FILE *OpenDataFile(const char *fname, const char *subdir)
 492 {
 493     char buffer[PATH_MAX] = "";
 494     const char *str, *next;
 495     FILE *f;
 496
 497     if(fname[0] == '/')
 498     {
 499         if((f=al_fopen(fname, "rb")) != NULL)
 500         {
 501             TRACE("Opened %s\n", fname);
 502             return f;
 503         }
 504         WARN("Could not open %s\n", fname);
 505         return NULL;
 506     }
 507
 508     if((str=getenv("XDG_DATA_HOME")) != NULL && str[0] != '\0')
 509         snprintf(buffer, sizeof(buffer), "%s/%s/%s", str, subdir, fname);
 510     else if((str=getenv("HOME")) != NULL && str[0] != '\0')
 511         snprintf(buffer, sizeof(buffer), "%s/.local/share/%s/%s", str, subdir, fname);
 512     if(buffer[0])
 513     {
 514         if((f=al_fopen(buffer, "rb")) != NULL)
 515         {
 516             TRACE("Opened %s\n", buffer);
 517             return f;
 518         }
 519         WARN("Could not open %s\n", buffer);
 520     }
 521
 522     if((str=getenv("XDG_DATA_DIRS")) == NULL || str[0] == '\0')
 523         str = "/usr/local/share/:/usr/share/";
 524
 525     next = str;
 526     while((str=next) != NULL && str[0] != '\0')
 527     {
 528         size_t len;
 529         next = strchr(str, ':');
 530
 531         if(!next)
 532             len = strlen(str);
 533         else
 534         {
 535             len = next - str;
 536             next++;
 537         }
 538
 539         if(len > sizeof(buffer)-1)
 540             len = sizeof(buffer)-1;
 541         strncpy(buffer, str, len);
 542         buffer[len] = '\0';
 543         snprintf(buffer+len, sizeof(buffer)-len, "/%s/%s", subdir, fname);
 544
 545         if((f=al_fopen(buffer, "rb")) != NULL)
 546         {
 547             TRACE("Opened %s\n", buffer);
 548             return f;
 549         }
 550         WARN("Could not open %s\n", buffer);
 551     }
 552
 553     return NULL;
 554 }
 555 #endif
 556
 557
 558 void SetRTPriority(void)
 559 {
 560     ALboolean failed = AL_FALSE;
 561
 562 #ifdef _WIN32
 563     if(RTPrioLevel > 0)
 564         failed = !SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_TIME_CRITICAL);
 565 #elif defined(HAVE_PTHREAD_SETSCHEDPARAM) && !defined(__OpenBSD__)
 566     if(RTPrioLevel > 0)
 567     {
 568         struct sched_param param;
 569         /* Use the minimum real-time priority possible for now (on Linux this
 570          * should be 1 for SCHED_RR) */
 571         param.sched_priority = sched_get_priority_min(SCHED_RR);
 572         failed = !!pthread_setschedparam(pthread_self(), SCHED_RR, &param);
 573     }
 574 #else
 575     /* Real-time priority not available */
 576     failed = (RTPrioLevel>0);
 577 #endif
 578     if(failed)
 579         ERR("Failed to set priority level for thread\n");
 580 }
 581
 582
 583 ALboolean vector_reserve(void *ptr, size_t base_size, size_t obj_count, size_t obj_size, ALboolean exact)
 584 {
 585     vector_ *vecptr = ptr;
 586     if((size_t)(*vecptr ? (*vecptr)->Capacity : 0) < obj_count)
 587     {
 588         ALsizei old_size = (*vecptr ? (*vecptr)->Size : 0);
 589         void *temp;
 590
 591         /* Limit vector sizes to the greatest power-of-two value that an
 592          * ALsizei can hold. */
 593         if(obj_count > (INT_MAX>>1)+1)
 594             return AL_FALSE;
 595
 596         /* Use the next power-of-2 size if we don't need to allocate the exact
 597          * amount. This is preferred when regularly increasing the vector since
 598          * it means fewer reallocations. Though it means it also wastes some
 599          * memory. */
 600         if(exact == AL_FALSE)
 601             obj_count = NextPowerOf2((ALuint)obj_count);
 602
 603         /* Need to be explicit with the caller type's base size, because it
 604          * could have extra padding before the start of the array (that is,
 605          * sizeof(*vector_) may not equal base_size). */
 606         temp = realloc(*vecptr, base_size + obj_size*obj_count);
 607         if(temp == NULL) return AL_FALSE;
 608
 609         *vecptr = temp;
 610         (*vecptr)->Capacity = (ALsizei)obj_count;
 611         (*vecptr)->Size = old_size;
 612     }
 613     return AL_TRUE;
 614 }
 615
 616 ALboolean vector_resize(void *ptr, size_t base_size, size_t obj_count, size_t obj_size)
 617 {
 618     vector_ *vecptr = ptr;
 619     if(*vecptr || obj_count > 0)
 620     {
 621         if(!vector_reserve(vecptr, base_size, obj_count, obj_size, AL_TRUE))
 622             return AL_FALSE;
 623         (*vecptr)->Size = (ALsizei)obj_count;
 624     }
 625     return AL_TRUE;
 626 }
 627
 628 ALboolean vector_insert(void *ptr, size_t base_size, size_t obj_size, void *ins_pos, const void *datstart, const void *datend)
 629 {
 630     vector_ *vecptr = ptr;
 631     if(datstart != datend)
 632     {
 633         ptrdiff_t ins_elem = ((char*)ins_pos - ((char*)(*vecptr) + base_size)) / obj_size;
 634         ptrdiff_t numins = ((const char*)datend - (const char*)datstart) / obj_size;
 635
 636         assert(numins > 0);
 637         if(INT_MAX-VECTOR_SIZE(*vecptr) <= numins ||
 638            !vector_reserve(vecptr, base_size, VECTOR_SIZE(*vecptr)+numins, obj_size, AL_TRUE))
 639             return AL_FALSE;
 640
 641         /* NOTE: ins_pos may have been invalidated if *vecptr moved. Use ins_elem instead. */
 642         if(ins_elem < (*vecptr)->Size)
 643         {
 644             memmove((char*)(*vecptr) + base_size + ((ins_elem+numins)*obj_size),
 645                     (char*)(*vecptr) + base_size + ((ins_elem       )*obj_size),
 646                     ((*vecptr)->Size-ins_elem)*obj_size);
 647         }
 648         memcpy((char*)(*vecptr) + base_size + (ins_elem*obj_size),
 649                datstart, numins*obj_size);
 650         (*vecptr)->Size += (ALsizei)numins;
 651     }
 652     return AL_TRUE;
 653 }
 654
 655
 656 extern inline void al_string_deinit(al_string *str);
 657 extern inline ALsizei al_string_length(const_al_string str);
 658 extern inline ALboolean al_string_empty(const_al_string str);
 659 extern inline const al_string_char_type *al_string_get_cstr(const_al_string str);
 660
 661 void al_string_clear(al_string *str)
 662 {
 663     /* Reserve one more character than the total size of the string. This is to
 664      * ensure we have space to add a null terminator in the string data so it
 665      * can be used as a C-style string. */
 666     VECTOR_RESERVE(*str, 1);
 667     VECTOR_RESIZE(*str, 0);
 668     *VECTOR_ITER_END(*str) = 0;
 669 }
 670
 671 static inline int al_string_compare(const al_string_char_type *str1, ALsizei str1len,
 672                                     const al_string_char_type *str2, ALsizei str2len)
 673 {
 674     ALsizei complen = mini(str1len, str2len);
 675     int ret = memcmp(str1, str2, complen);
 676     if(ret == 0)
 677     {
 678         if(str1len > str2len) return  1;
 679         if(str1len < str2len) return -1;
 680     }
 681     return ret;
 682 }
 683 int al_string_cmp(const_al_string str1, const_al_string str2)
 684 {
 685     return al_string_compare(&VECTOR_FRONT(str1), al_string_length(str1),
 686                              &VECTOR_FRONT(str2), al_string_length(str2));
 687 }
 688 int al_string_cmp_cstr(const_al_string str1, const al_string_char_type *str2)
 689 {
 690     return al_string_compare(&VECTOR_FRONT(str1), al_string_length(str1),
 691                              str2, (ALsizei)strlen(str2));
 692 }
 693
 694 void al_string_copy(al_string *str, const_al_string from)
 695 {
 696     ALsizei len = VECTOR_SIZE(from);
 697     VECTOR_RESERVE(*str, len+1);
 698     VECTOR_RESIZE(*str, 0);
 699     VECTOR_INSERT(*str, VECTOR_ITER_END(*str), VECTOR_ITER_BEGIN(from), VECTOR_ITER_BEGIN(from)+len);
 700     *VECTOR_ITER_END(*str) = 0;
 701 }
 702
 703 void al_string_copy_cstr(al_string *str, const al_string_char_type *from)
 704 {
 705     size_t len = strlen(from);
 706     VECTOR_RESERVE(*str, len+1);
 707     VECTOR_RESIZE(*str, 0);
 708     VECTOR_INSERT(*str, VECTOR_ITER_END(*str), from, from+len);
 709     *VECTOR_ITER_END(*str) = 0;
 710 }
 711
 712 void al_string_append_char(al_string *str, const al_string_char_type c)
 713 {
 714     VECTOR_RESERVE(*str, al_string_length(*str)+2);
 715     VECTOR_PUSH_BACK(*str, c);
 716     *VECTOR_ITER_END(*str) = 0;
 717 }
 718
 719 void al_string_append_cstr(al_string *str, const al_string_char_type *from)
 720 {
 721     size_t len = strlen(from);
 722     if(len != 0)
 723     {
 724         VECTOR_RESERVE(*str, al_string_length(*str)+len+1);
 725         VECTOR_INSERT(*str, VECTOR_ITER_END(*str), from, from+len);
 726         *VECTOR_ITER_END(*str) = 0;
 727     }
 728 }
 729
 730 void al_string_append_range(al_string *str, const al_string_char_type *from, const al_string_char_type *to)
 731 {
 732     if(to != from)
 733     {
 734         VECTOR_RESERVE(*str, al_string_length(*str)+(to-from)+1);
 735         VECTOR_INSERT(*str, VECTOR_ITER_END(*str), from, to);
 736         *VECTOR_ITER_END(*str) = 0;
 737     }
 738 }
 739
 740 #ifdef _WIN32
 741 void al_string_copy_wcstr(al_string *str, const wchar_t *from)
 742 {
 743     int len;
 744     if((len=WideCharToMultiByte(CP_UTF8, 0, from, -1, NULL, 0, NULL, NULL)) > 0)
 745     {
 746         VECTOR_RESERVE(*str, len);
 747         VECTOR_RESIZE(*str, len-1);
 748         WideCharToMultiByte(CP_UTF8, 0, from, -1, &VECTOR_FRONT(*str), len, NULL, NULL);
 749         *VECTOR_ITER_END(*str) = 0;
 750     }
 751 }
 752 #endif