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Diffstat (limited to 'xs/src/png/error.hpp')
-rw-r--r-- | xs/src/png/error.hpp | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/xs/src/png/error.hpp b/xs/src/png/error.hpp new file mode 100644 index 000000000..c67f97630 --- /dev/null +++ b/xs/src/png/error.hpp @@ -0,0 +1,125 @@ +/* + * 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 |