Method WritePatchFile

Src/DiffWrapper.cpp:1742–1857

* @brief Write out a patch file. * Writes patch file using already computed diffutils script. Converts path * delimiters from \ to / since we want to keep compatibility with patch-tools. * @param [in] script list of changes. * @param [in] inf file_data table containing filenames */

 * @param [in] inf file_data table containing filenames
 */
void CDiffWrapper::WritePatchFile(struct change * script, file_data * inf)
{
	file_data inf_patch[2] = { inf[0], inf[1] };

	// Get paths, primarily use alternative paths, only if they are empty
	// use full filepaths
	String path1(m_alternativePaths[0]);
	String path2(m_alternativePaths[1]);
	if (path1.empty())
		path1 = m_files[0];
	if (path2.empty())
		path2 = m_files[1];
	path1 = paths::ToUnixPath(path1);
	path2 = paths::ToUnixPath(path2);
	auto strdupPath = [](const String& path, const void *buffer, size_t buffered_chars) -> char*
	{
		FileTextEncoding encoding = codepage_detect::Guess(_T(""), buffer, buffered_chars, 1);
		if (encoding.m_unicoding != ucr::NONE)
			encoding.SetUnicoding(ucr::UTF8);
		ucr::buffer buf(256);
		ucr::convert(ucr::CP_TCHAR, reinterpret_cast<const unsigned char *>(path.c_str()), static_cast<int>(path.size() * sizeof(tchar_t)), encoding.m_codepage, &buf);
		return strdup(reinterpret_cast<const char *>(buf.ptr));
	};
	inf_patch[0].name = strdupPath(path1, inf_patch[0].buffer, inf_patch[0].buffered_chars);
	inf_patch[1].name = strdupPath(path2, inf_patch[1].buffer, inf_patch[1].buffered_chars);

	// If paths in m_s1File and m_s2File point to original files, then we can use
	// them to fix potentially meaningless stats from potentially temporary files,
	// resulting from whatever transforms may have taken place.
	// If not, then we can't help it, and hence assert that this won't happen.
	if (!m_bPathsAreTemp)
	{
		mywstat(m_files[0].c_str(), &inf_patch[0].stat);
		mywstat(m_files[1].c_str(), &inf_patch[1].stat);
	}
	else
	{
		assert(false);
	}

	outfile = nullptr;
	if (!m_sPatchFile.empty())
	{
		const tchar_t *mode = (m_bAppendFiles ? _T("a+") : _T("w+"));
		if (cio::tfopen_s(&outfile, m_sPatchFile, mode) != 0)
			outfile = nullptr;
	}

	if (outfile == nullptr)
	{
		m_status.bPatchFileFailed = true;
		return;
	}

	if (paths::IsNullDeviceName(ucr::toTString(inf[0].name)))
	{
		free((void *)inf_patch[0].name);
		inf_patch[0].name = strdup("/dev/null");