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+/* sane - Scanner Access Now Easy.
+
+ Copyright (C) 2019 Povilas Kanapickas <povilas@radix.lt>
+
+ This file is part of the SANE package.
+
+ This program is free software; you can redistribute it and/or
+ modify it under the terms of the GNU General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ MA 02111-1307, USA.
+
+ As a special exception, the authors of SANE give permission for
+ additional uses of the libraries contained in this release of SANE.
+
+ The exception is that, if you link a SANE library with other files
+ to produce an executable, this does not by itself cause the
+ resulting executable to be covered by the GNU General Public
+ License. Your use of that executable is in no way restricted on
+ account of linking the SANE library code into it.
+
+ This exception does not, however, invalidate any other reasons why
+ the executable file might be covered by the GNU General Public
+ License.
+
+ If you submit changes to SANE to the maintainers to be included in
+ a subsequent release, you agree by submitting the changes that
+ those changes may be distributed with this exception intact.
+
+ If you write modifications of your own for SANE, it is your choice
+ whether to permit this exception to apply to your modifications.
+ If you do not wish that, delete this exception notice.
+*/
+
+#ifndef BACKEND_GENESYS_ERROR_H
+#define BACKEND_GENESYS_ERROR_H
+
+#include "../include/sane/config.h"
+#include "../include/sane/sane.h"
+#include "../include/sane/sanei_backend.h"
+
+#include <stdexcept>
+#include <cstdarg>
+#include <cstring>
+#include <string>
+#include <new>
+
+#define DBG_error0 0 /* errors/warnings printed even with devuglevel 0 */
+#define DBG_error 1 /* fatal errors */
+#define DBG_init 2 /* initialization and scanning time messages */
+#define DBG_warn 3 /* warnings and non-fatal errors */
+#define DBG_info 4 /* informational messages */
+#define DBG_proc 5 /* starting/finishing functions */
+#define DBG_io 6 /* io functions */
+#define DBG_io2 7 /* io functions that are called very often */
+#define DBG_data 8 /* log image data */
+
+namespace genesys {
+
+class SaneException : public std::exception {
+public:
+ SaneException(SANE_Status status);
+ SaneException(SANE_Status status, const char* format, ...)
+ #ifdef __GNUC__
+ __attribute__((format(printf, 3, 4)))
+ #endif
+ ;
+
+ SaneException(const char* format, ...)
+ #ifdef __GNUC__
+ __attribute__((format(printf, 2, 3)))
+ #endif
+ ;
+
+ SANE_Status status() const;
+ const char* what() const noexcept override;
+
+private:
+
+ void set_msg();
+ void set_msg(const char* format, std::va_list vlist);
+
+ std::string msg_;
+ SANE_Status status_;
+};
+
+// call a function and throw an exception on error
+#define TIE(function) \
+ do { \
+ SANE_Status tmp_status = function; \
+ if (tmp_status != SANE_STATUS_GOOD) { \
+ throw ::genesys::SaneException(tmp_status); \
+ } \
+ } while (false)
+
+class DebugMessageHelper {
+public:
+ static constexpr unsigned MAX_BUF_SIZE = 120;
+
+ DebugMessageHelper(const char* func);
+ DebugMessageHelper(const char* func, const char* format, ...)
+ #ifdef __GNUC__
+ __attribute__((format(printf, 3, 4)))
+ #endif
+ ;
+
+ ~DebugMessageHelper();
+
+ void status(const char* msg) { vstatus("%s", msg); }
+ void vstatus(const char* format, ...)
+ #ifdef __GNUC__
+ __attribute__((format(printf, 2, 3)))
+ #endif
+ ;
+
+ void clear() { msg_[0] = '\n'; }
+
+ void log(unsigned level, const char* msg);
+ void vlog(unsigned level, const char* format, ...)
+ #ifdef __GNUC__
+ __attribute__((format(printf, 3, 4)))
+ #endif
+ ;
+
+private:
+ const char* func_ = nullptr;
+ char msg_[MAX_BUF_SIZE];
+ unsigned num_exceptions_on_enter_ = 0;
+};
+
+
+#if defined(__GNUC__) || defined(__clang__)
+#define GENESYS_CURRENT_FUNCTION __PRETTY_FUNCTION__
+#elif defined(__FUNCSIG__)
+#define GENESYS_CURRENT_FUNCTION __FUNCSIG__
+#else
+#define GENESYS_CURRENT_FUNCTION __func__
+#endif
+
+#define DBG_HELPER(var) DebugMessageHelper var(GENESYS_CURRENT_FUNCTION)
+#define DBG_HELPER_ARGS(var, ...) DebugMessageHelper var(GENESYS_CURRENT_FUNCTION, __VA_ARGS__)
+
+template<class F>
+SANE_Status wrap_exceptions_to_status_code(const char* func, F&& function)
+{
+ try {
+ function();
+ return SANE_STATUS_GOOD;
+ } catch (const SaneException& exc) {
+ DBG(DBG_error, "%s: got error: %s\n", func, exc.what());
+ return exc.status();
+ } catch (const std::bad_alloc& exc) {
+ (void) exc;
+ DBG(DBG_error, "%s: failed to allocate memory\n", func);
+ return SANE_STATUS_NO_MEM;
+ } catch (const std::exception& exc) {
+ DBG(DBG_error, "%s: got uncaught exception: %s\n", func, exc.what());
+ return SANE_STATUS_INVAL;
+ } catch (...) {
+ DBG(DBG_error, "%s: got unknown uncaught exception\n", func);
+ return SANE_STATUS_INVAL;
+ }
+}
+
+template<class F>
+void catch_all_exceptions(const char* func, F&& function)
+{
+ try {
+ function();
+ } catch (const SaneException& exc) {
+ DBG(DBG_error, "%s: got exception: %s\n", func, exc.what());
+ } catch (const std::bad_alloc& exc) {
+ DBG(DBG_error, "%s: got exception: could not allocate memory: %s\n", func, exc.what());
+ } catch (const std::exception& exc) {
+ DBG(DBG_error, "%s: got uncaught exception: %s\n", func, exc.what());
+ } catch (...) {
+ DBG(DBG_error, "%s: got unknown uncaught exception\n", func);
+ }
+}
+
+inline void wrap_status_code_to_exception(SANE_Status status)
+{
+ if (status == SANE_STATUS_GOOD)
+ return;
+ throw SaneException(status);
+}
+
+} // namespace genesys
+
+#endif // BACKEND_GENESYS_ERROR_H