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/*
* Copyright (C) 2007,2008 Alex Shulgin
*
* This file is part of png++ the C++ wrapper for libpng. PNG++ is free
* software; the exact copying conditions are as follows:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef PNGPP_ERROR_HPP_INCLUDED
#define PNGPP_ERROR_HPP_INCLUDED
/* check if we have strerror_s or strerror_r, prefer the former which is C11 std */
#ifdef __STDC_LIB_EXT1__
#define __STDC_WANT_LIB_EXT1__ 1
#include <string.h>
#define HAVE_STRERROR_S 1
#else
#undef HAVE_STRERROR_S
#endif
#include <string>
#include <stdexcept>
#include <cerrno>
#include <cstdlib>
#include <cstring>
namespace png
{
/**
* \brief Exception class to represent runtime errors related to
* png++ operation.
*/
class error
: public std::runtime_error
{
public:
/**
* \param message error description
*/
explicit error(std::string const& message)
: std::runtime_error(message)
{
}
};
/**
* \brief Exception class to represent standard library errors
* (generally IO).
*
* \see reader, writer
*/
class std_error
: public std::runtime_error
{
public:
/**
* Constructs an std_error object. The \a message string is
* appended with <tt>": "</tt> and the error description as
* returned by \c strerror(\a error).
*
* \param message error description
* \param error error number
*/
explicit std_error(std::string const& message, int errnum = errno)
: std::runtime_error((message + ": ") + thread_safe_strerror(errnum))
{
}
protected:
static std::string thread_safe_strerror(int errnum)
{
#define ERRBUF_SIZE 512
#ifdef HAVE_STRERROR_S
char buf[ERRBUF_SIZE] = { 0 };
strerror_s(buf, ERRBUF_SIZE, errnum);
return std::string(buf);
#else
#if (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !_GNU_SOURCE
char buf[ERRBUF_SIZE] = { 0 };
strerror_r(errnum, buf, ERRBUF_SIZE);
return std::string(buf);
#elif _GNU_SOURCE
/* GNU variant can return a pointer to static buffer instead of buf */
char buf[ERRBUF_SIZE] = { 0 };
return std::string(strerror_r(errnum, buf, ERRBUF_SIZE));
#else
return std::string("An error occured with errnum ") +
std::to_string(errnum) +
". Converting to the appropriate error message is disabled"
"in this instance of the png++ library.";
#endif
#endif
#undef ERRBUF_SIZE
}
};
} // namespace png
#endif // PNGPP_ERROR_HPP_INCLUDED
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