1 files changed, 115 insertions, 0 deletions
diff --git a/backend/genesys_error.cc b/backend/genesys_error.cc
new file mode 100644
index 0000000..c98a490
--- /dev/null
+++ b/backend/genesys_error.cc
@@ -0,0 +1,115 @@
+/* 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.
+*/
+
+#define DEBUG_DECLARE_ONLY
+
+#include "genesys_error.h"
+#include <cstdarg>
+#include <cstdio>
+
+extern "C" void sanei_debug_msg(int level, int max_level, const char *be, const char *fmt,
+                                va_list ap);
+
+#if (defined(__GNUC__) || defined(__CLANG__)) && (defined(__linux__) || defined(__APPLE__))
+extern "C" char* __cxa_get_globals();
+#endif
+
+static unsigned num_uncaught_exceptions()
+{
+#if __cplusplus >= 201703L
+    int count = std::uncaught_exceptions();
+    return count >= 0 ? count : 0;
+#elif (defined(__GNUC__) || defined(__CLANG__)) && (defined(__linux__) || defined(__APPLE__))
+    // the format of the __cxa_eh_globals struct is enshrined into the Itanium C++ ABI and it's
+    // very unlikely we'll get issues referencing it directly
+    char* cxa_eh_globals_ptr = __cxa_get_globals();
+    return *reinterpret_cast<unsigned*>(cxa_eh_globals_ptr + sizeof(void*));
+#else
+    return std::uncaught_exception() ? 1 : 0;
+#endif
+}
+
+DebugMessageHelper::DebugMessageHelper(const char* func)
+{
+    func_ = func;
+    num_exceptions_on_enter_ = num_uncaught_exceptions();
+    msg_[0] = '\0';
+    DBG(DBG_proc, "%s: start\n", func_);
+}
+
+DebugMessageHelper::DebugMessageHelper(const char* func, const char* format, ...)
+{
+    func_ = func;
+    num_exceptions_on_enter_ = num_uncaught_exceptions();
+    msg_[0] = '\0';
+    DBG(DBG_proc, "%s: start\n", func_);
+    DBG(DBG_proc, "%s: ", func_);
+
+    std::va_list args;
+    va_start(args, format);
+    sanei_debug_msg(DBG_proc, DBG_LEVEL, STRINGIFY(BACKEND_NAME), format, args);
+    va_end(args);
+    DBG(DBG_proc, "\n");
+}
+
+
+DebugMessageHelper::~DebugMessageHelper()
+{
+    if (num_exceptions_on_enter_ < num_uncaught_exceptions()) {
+        if (msg_[0] != '\0') {
+            DBG(DBG_error, "%s: failed during %s\n", func_, msg_);
+        } else {
+            DBG(DBG_error, "%s: failed\n", func_);
+        }
+    } else {
+        DBG(DBG_proc, "%s: completed\n", func_);
+    }
+}
+
+void DebugMessageHelper::vstatus(const char* format, ...)
+{
+    std::va_list args;
+    va_start(args, format);
+    std::vsnprintf(msg_, MAX_BUF_SIZE, format, args);
+    va_end(args);
+}