1 /* 2 * Copyright (C) 2007,2008 Alex Shulgin 3 * 4 * This file is part of png++ the C++ wrapper for libpng. PNG++ is free 5 * software; the exact copying conditions are as follows: 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright notice, 11 * this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN 23 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 25 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 #ifndef PNGPP_ERROR_HPP_INCLUDED 32 #define PNGPP_ERROR_HPP_INCLUDED 33 34 /* check if we have strerror_s or strerror_r, prefer the former which is C11 std */ 35 #ifdef __STDC_LIB_EXT1__ 36 #define __STDC_WANT_LIB_EXT1__ 1 37 #include <string.h> 38 39 #define HAVE_STRERROR_S 1 40 #else 41 #undef HAVE_STRERROR_S 42 #endif 43 44 #include <string> 45 #include <stdexcept> 46 #include <cerrno> 47 #include <cstdlib> 48 #include <cstring> 49 50 namespace png 51 { 52 53 /** 54 * \brief Exception class to represent runtime errors related to 55 * png++ operation. 56 */ 57 class error 58 : public std::runtime_error 59 { 60 public: 61 /** 62 * \param message error description 63 */ error(std::string const & message)64 explicit error(std::string const& message) 65 : std::runtime_error(message) 66 { 67 } 68 }; 69 70 /** 71 * \brief Exception class to represent standard library errors 72 * (generally IO). 73 * 74 * \see reader, writer 75 */ 76 class std_error 77 : public std::runtime_error 78 { 79 public: 80 /** 81 * Constructs an std_error object. The \a message string is 82 * appended with <tt>": "</tt> and the error description as 83 * returned by \c strerror(\a error). 84 * 85 * \param message error description 86 * \param error error number 87 */ std_error(std::string const & message,int errnum=errno)88 explicit std_error(std::string const& message, int errnum = errno) 89 : std::runtime_error((message + ": ") + thread_safe_strerror(errnum)) 90 { 91 } 92 93 protected: thread_safe_strerror(int errnum)94 static std::string thread_safe_strerror(int errnum) 95 { 96 #define ERRBUF_SIZE 512 97 char buf[ERRBUF_SIZE] = { 0 }; 98 99 #ifdef HAVE_STRERROR_S 100 strerror_s(buf, ERRBUF_SIZE, errnum); 101 return std::string(buf); 102 #else 103 #if ((_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !_GNU_SOURCE) || (!__GLIBC__) 104 strerror_r(errnum, buf, ERRBUF_SIZE); 105 return std::string(buf); 106 #else 107 /* GNU variant can return a pointer to static buffer instead of buf */ 108 return std::string(strerror_r(errnum, buf, ERRBUF_SIZE)); 109 #endif 110 #endif 111 112 #undef ERRBUF_SIZE 113 } 114 }; 115 116 } // namespace png 117 118 #endif // PNGPP_ERROR_HPP_INCLUDED 119