Merge branch 'feature/upstream' into develop

1 files changed, 199 insertions, 0 deletions

diff --git a/backend/genesys/error.h b/backend/genesys/error.h
new file mode 100644
index 0000000..5aba8cf
--- /dev/null
+++ b/backend/genesys/error.h
@@ -0,0 +1,199 @@
+/* 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