PNG conversion and parallel execution working.

xs/src/png/error.hpp

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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
+            char buf[ERRBUF_SIZE] = { 0 };
+
+#ifdef HAVE_STRERROR_S
+            strerror_s(buf, ERRBUF_SIZE, errnum);
+            return std::string(buf);
+#else
+#if (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !_GNU_SOURCE
+            strerror_r(errnum, buf, ERRBUF_SIZE);
+            return std::string(buf);
+#else
+            /* GNU variant can return a pointer to static buffer instead of buf */
+            return std::string(strerror_r(errnum, buf, ERRBUF_SIZE));
+#endif
+#endif
+
+#undef ERRBUF_SIZE
+        }
+    };
+
+} // namespace png
+
+#endif // PNGPP_ERROR_HPP_INCLUDED