kopia lustrzana https://gitlab.com/sane-project/backends
216 wiersze
6.2 KiB
C++
216 wiersze
6.2 KiB
C++
/* sane - Scanner Access Now Easy.
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Copyright (C) 2019 Povilas Kanapickas <povilas@radix.lt>
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This file is part of the SANE package.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA.
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As a special exception, the authors of SANE give permission for
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additional uses of the libraries contained in this release of SANE.
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The exception is that, if you link a SANE library with other files
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to produce an executable, this does not by itself cause the
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resulting executable to be covered by the GNU General Public
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License. Your use of that executable is in no way restricted on
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account of linking the SANE library code into it.
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This exception does not, however, invalidate any other reasons why
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the executable file might be covered by the GNU General Public
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License.
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If you submit changes to SANE to the maintainers to be included in
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a subsequent release, you agree by submitting the changes that
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those changes may be distributed with this exception intact.
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If you write modifications of your own for SANE, it is your choice
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whether to permit this exception to apply to your modifications.
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If you do not wish that, delete this exception notice.
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*/
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#define DEBUG_DECLARE_ONLY
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#include "error.h"
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#include <cstdarg>
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namespace genesys {
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extern "C" void sanei_debug_msg(int level, int max_level, const char *be, const char *fmt,
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std::va_list ap);
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#if (defined(__GNUC__) || defined(__CLANG__)) && (defined(__linux__) || defined(__APPLE__))
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extern "C" char* __cxa_get_globals();
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#endif
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static unsigned num_uncaught_exceptions()
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{
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#if __cplusplus >= 201703L
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int count = std::uncaught_exceptions();
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return count >= 0 ? count : 0;
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#elif (defined(__GNUC__) || defined(__CLANG__)) && (defined(__linux__) || defined(__APPLE__))
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// the format of the __cxa_eh_globals struct is enshrined into the Itanium C++ ABI and it's
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// very unlikely we'll get issues referencing it directly
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char* cxa_eh_globals_ptr = __cxa_get_globals();
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return *reinterpret_cast<unsigned*>(cxa_eh_globals_ptr + sizeof(void*));
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#else
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return std::uncaught_exception() ? 1 : 0;
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#endif
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}
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SaneException::SaneException(SANE_Status status) : status_(status)
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{
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set_msg();
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}
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SaneException::SaneException(SANE_Status status, const char* format, ...) : status_(status)
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{
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std::va_list args;
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va_start(args, format);
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set_msg(format, args);
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va_end(args);
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}
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SaneException::SaneException(const char* format, ...) : status_(SANE_STATUS_INVAL)
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{
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std::va_list args;
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va_start(args, format);
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set_msg(format, args);
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va_end(args);
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}
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SANE_Status SaneException::status() const
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{
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return status_;
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}
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const char* SaneException::what() const noexcept
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{
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return msg_.c_str();
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}
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void SaneException::set_msg()
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{
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const char* status_msg = sane_strstatus(status_);
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std::size_t status_msg_len = std::strlen(status_msg);
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msg_.reserve(status_msg_len);
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msg_ = status_msg;
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}
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void SaneException::set_msg(const char* format, std::va_list vlist)
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{
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const char* status_msg = sane_strstatus(status_);
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std::size_t status_msg_len = std::strlen(status_msg);
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std::va_list vlist2;
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va_copy(vlist2, vlist);
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int msg_len = std::vsnprintf(nullptr, 0, format, vlist2);
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va_end(vlist2);
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if (msg_len < 0) {
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const char* formatting_error_msg = "(error formatting arguments)";
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msg_.reserve(std::strlen(formatting_error_msg) + 3 + status_msg_len);
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msg_ = formatting_error_msg;
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msg_ += " : ";
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msg_ += status_msg;
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return;
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}
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msg_.reserve(msg_len + status_msg_len + 3);
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msg_.resize(msg_len + 1, ' ');
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std::vsnprintf(&msg_[0], msg_len + 1, format, vlist);
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msg_.resize(msg_len, ' ');
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msg_ += " : ";
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msg_ += status_msg;
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}
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DebugMessageHelper::DebugMessageHelper(const char* func)
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{
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func_ = func;
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num_exceptions_on_enter_ = num_uncaught_exceptions();
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msg_[0] = '\0';
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DBG(DBG_proc, "%s: start\n", func_);
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}
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DebugMessageHelper::DebugMessageHelper(const char* func, const char* format, ...)
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{
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func_ = func;
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num_exceptions_on_enter_ = num_uncaught_exceptions();
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msg_[0] = '\0';
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DBG(DBG_proc, "%s: start\n", func_);
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DBG(DBG_proc, "%s: ", func_);
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std::va_list args;
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va_start(args, format);
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sanei_debug_msg(DBG_proc, DBG_LEVEL, STRINGIFY(BACKEND_NAME), format, args);
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va_end(args);
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DBG(DBG_proc, "\n");
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}
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DebugMessageHelper::~DebugMessageHelper()
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{
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if (num_exceptions_on_enter_ < num_uncaught_exceptions()) {
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if (msg_[0] != '\0') {
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DBG(DBG_error, "%s: failed during %s\n", func_, msg_);
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} else {
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DBG(DBG_error, "%s: failed\n", func_);
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}
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} else {
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DBG(DBG_proc, "%s: completed\n", func_);
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}
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}
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void DebugMessageHelper::vstatus(const char* format, ...)
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{
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std::va_list args;
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va_start(args, format);
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std::vsnprintf(msg_, MAX_BUF_SIZE, format, args);
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va_end(args);
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}
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void DebugMessageHelper::log(unsigned level, const char* msg)
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{
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DBG(level, "%s: %s\n", func_, msg);
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}
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void DebugMessageHelper::vlog(unsigned level, const char* format, ...)
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{
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std::string msg;
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std::va_list args;
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va_start(args, format);
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int msg_len = std::vsnprintf(nullptr, 0, format, args);
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va_end(args);
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if (msg_len < 0) {
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DBG(level, "%s: error formatting error message: %s\n", func_, format);
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return;
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}
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msg.resize(msg_len + 1, ' ');
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va_start(args, format);
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std::vsnprintf(&msg.front(), msg.size(), format, args);
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va_end(args);
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msg.resize(msg_len, ' '); // strip the null character
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DBG(level, "%s: %s\n", func_, msg.c_str());
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}
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} // namespace genesys
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