al/extension.cpp

   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.,
  17  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  * Or go to http://www.gnu.org/copyleft/lgpl.html
  19  */
  20
  21 #include "config.h"
  22
  23 #include <cctype>
  24 #include <cstdlib>
  25 #include <cstring>
  26
  27 #include "AL/al.h"
  28 #include "AL/alc.h"
  29
  30 #include "alc/context.h"
  31 #include "alstring.h"
  32 #include "core/except.h"
  33 #include "opthelpers.h"
  34
  35
  36 AL_API ALboolean AL_APIENTRY alIsExtensionPresent(const ALchar *extName)
  37 START_API_FUNC
  38 {
  39     ContextRef context{GetContextRef()};
  40     if(unlikely(!context)) return AL_FALSE;
  41
  42     if(!extName)
  43         SETERR_RETURN(context, AL_INVALID_VALUE, AL_FALSE, "NULL pointer");
  44
  45     size_t len{strlen(extName)};
  46     const char *ptr{context->mExtensionList};
  47     while(ptr && *ptr)
  48     {
  49         if(al::strncasecmp(ptr, extName, len) == 0 && (ptr[len] == '\0' || isspace(ptr[len])))
  50             return AL_TRUE;
  51
  52         if((ptr=strchr(ptr, ' ')) != nullptr)
  53         {
  54             do {
  55                 ++ptr;
  56             } while(isspace(*ptr));
  57         }
  58     }
  59
  60     return AL_FALSE;
  61 }
  62 END_API_FUNC
  63
  64
  65 AL_API ALvoid* AL_APIENTRY alGetProcAddress(const ALchar *funcName)
  66 START_API_FUNC
  67 {
  68     if(!funcName) return nullptr;
  69     return alcGetProcAddress(nullptr, funcName);
  70 }
  71 END_API_FUNC
  72
  73 AL_API ALenum AL_APIENTRY alGetEnumValue(const ALchar *enumName)
  74 START_API_FUNC
  75 {
  76     if(!enumName) return static_cast<ALenum>(0);
  77     return alcGetEnumValue(nullptr, enumName);
  78 }
  79 END_API_FUNC