al/error.cpp

   1 /**
   2  * OpenAL cross platform audio library
   3  * Copyright (C) 1999-2000 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 "error.h"
  24
  25 #ifdef _WIN32
  26 #define WIN32_LEAN_AND_MEAN
  27 #include <windows.h>
  28 #endif
  29
  30 #include <atomic>
  31 #include <csignal>
  32 #include <cstdarg>
  33 #include <cstdio>
  34 #include <cstdlib>
  35 #include <cstring>
  36 #include <limits>
  37 #include <optional>
  38 #include <string>
  39 #include <utility>
  40 #include <vector>
  41
  42 #include "AL/al.h"
  43 #include "AL/alc.h"
  44
  45 #include "al/debug.h"
  46 #include "alc/alconfig.h"
  47 #include "alc/context.h"
  48 #include "alc/inprogext.h"
  49 #include "core/logging.h"
  50 #include "opthelpers.h"
  51 #include "strutils.h"
  52
  53
  54 namespace al {
  55 context_error::context_error(ALenum code, const char *msg, ...) : mErrorCode{code}
  56 {
  57     /* NOLINTBEGIN(*-array-to-pointer-decay) */
  58     std::va_list args;
  59     va_start(args, msg);
  60     setMessage(msg, args);
  61     va_end(args);
  62     /* NOLINTEND(*-array-to-pointer-decay) */
  63 }
  64 context_error::~context_error() = default;
  65 } /* namespace al */
  66
  67 void ALCcontext::setError(ALenum errorCode, const char *msg, ...)
  68 {
  69     auto message = std::vector<char>(256);
  70
  71     /* NOLINTBEGIN(*-array-to-pointer-decay) */
  72     std::va_list args, args2;
  73     va_start(args, msg);
  74     va_copy(args2, args);
  75     int msglen{std::vsnprintf(message.data(), message.size(), msg, args)};
  76     if(msglen >= 0 && static_cast<size_t>(msglen) >= message.size())
  77     {
  78         message.resize(static_cast<size_t>(msglen) + 1u);
  79         msglen = std::vsnprintf(message.data(), message.size(), msg, args2);
  80     }
  81     va_end(args2);
  82     va_end(args);
  83     /* NOLINTEND(*-array-to-pointer-decay) */
  84
  85     if(msglen >= 0)
  86         msg = message.data();
  87     else
  88     {
  89         msg = "<internal error constructing message>";
  90         msglen = static_cast<int>(strlen(msg));
  91     }
  92
  93     WARN("Error generated on context %p, code 0x%04x, \"%s\"\n",
  94         decltype(std::declval<void*>()){this}, errorCode, msg);
  95     if(TrapALError)
  96     {
  97 #ifdef _WIN32
  98         /* DebugBreak will cause an exception if there is no debugger */
  99         if(IsDebuggerPresent())
 100             DebugBreak();
 101 #elif defined(SIGTRAP)
 102         raise(SIGTRAP);
 103 #endif
 104     }
 105
 106     if(mLastThreadError.get() == AL_NO_ERROR)
 107         mLastThreadError.set(errorCode);
 108
 109     debugMessage(DebugSource::API, DebugType::Error, 0, DebugSeverity::High,
 110         {msg, static_cast<uint>(msglen)});
 111 }
 112
 113 /* Special-case alGetError since it (potentially) raises a debug signal and
 114  * returns a non-default value for a null context.
 115  */
 116 AL_API auto AL_APIENTRY alGetError() noexcept -> ALenum
 117 {
 118     if(auto context = GetContextRef()) LIKELY
 119         return alGetErrorDirect(context.get());
 120
 121     auto get_value = [](const char *envname, const char *optname) -> ALenum
 122     {
 123         auto optstr = al::getenv(envname);
 124         if(!optstr)
 125             optstr = ConfigValueStr({}, "game_compat", optname);
 126         if(optstr)
 127         {
 128             char *end{};
 129             auto value = std::strtoul(optstr->c_str(), &end, 0);
 130             if(end && *end == '\0' && value <= std::numeric_limits<ALenum>::max())
 131                 return static_cast<ALenum>(value);
 132             ERR("Invalid default error value: \"%s\"", optstr->c_str());
 133         }
 134         return AL_INVALID_OPERATION;
 135     };
 136     static const ALenum deferror{get_value("__ALSOFT_DEFAULT_ERROR", "default-error")};
 137
 138     WARN("Querying error state on null context (implicitly 0x%04x)\n", deferror);
 139     if(TrapALError)
 140     {
 141 #ifdef _WIN32
 142         if(IsDebuggerPresent())
 143             DebugBreak();
 144 #elif defined(SIGTRAP)
 145         raise(SIGTRAP);
 146 #endif
 147     }
 148     return deferror;
 149 }
 150
 151 FORCE_ALIGN ALenum AL_APIENTRY alGetErrorDirect(ALCcontext *context) noexcept
 152 {
 153     ALenum ret{context->mLastThreadError.get()};
 154     if(ret != AL_NO_ERROR) UNLIKELY
 155         context->mLastThreadError.set(AL_NO_ERROR);
 156     return ret;
 157 }