png++: error.hpp Source File

png++ 0.2.10

error.hpp
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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
57 class error
58 : public std::runtime_error
59 {
60 public:
64 explicit error(std::string const& message)
65 : std::runtime_error(message)
66 {
67 }
68 };
69
76 class std_error
77 : public std::runtime_error
78 {
79 public:
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:
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
png::std_error::std_error
std_error(std::string const &message, int errnum=errno)
Definition: error.hpp:88
png::error
Exception class to represent runtime errors related to png++ operation.
Definition: error.hpp:59
png::std_error::thread_safe_strerror
static std::string thread_safe_strerror(int errnum)
Definition: error.hpp:94
png::std_error
Exception class to represent standard library errors (generally IO).
Definition: error.hpp:78
png::error::error
error(std::string const &message)
Definition: error.hpp:64
png
Definition: color.hpp:37