mirror of https://github.com/OpenTTD/OpenTTD.git
114 lines
3.5 KiB
C++
114 lines
3.5 KiB
C++
/*
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* This file is part of OpenTTD.
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* OpenTTD 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, version 2.
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* OpenTTD 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.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file ini.cpp Definition of the IniItem class, related to reading/writing '*.ini' files. */
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#include "stdafx.h"
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#include "debug.h"
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#include "ini_type.h"
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#include "string_func.h"
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#include "fileio_func.h"
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#include <fstream>
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#ifdef __EMSCRIPTEN__
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# include <emscripten.h>
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#endif
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#if (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 199309L) || (defined(_XOPEN_SOURCE) && _XOPEN_SOURCE >= 500)
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# include <unistd.h>
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# include <fcntl.h>
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#endif
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#include <filesystem>
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#include "safeguards.h"
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/**
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* Create a new ini file with given group names.
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* @param list_group_names A list with group names that should be loaded as lists instead of variables. @see IGT_LIST
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*/
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IniFile::IniFile(const IniGroupNameList &list_group_names) : IniLoadFile(list_group_names)
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{
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}
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/**
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* Save the Ini file's data to the disk.
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* @param filename the file to save to.
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* @return true if saving succeeded.
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*/
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bool IniFile::SaveToDisk(const std::string &filename)
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{
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/*
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* First write the configuration to a (temporary) file and then rename
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* that file. This to prevent that when OpenTTD crashes during the save
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* you end up with a truncated configuration file.
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*/
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std::string file_new{ filename };
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file_new.append(".new");
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std::ofstream os(OTTD2FS(file_new).c_str());
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if (os.fail()) return false;
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for (const IniGroup &group : this->groups) {
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os << group.comment << "[" << group.name << "]\n";
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for (const IniItem &item : group.items) {
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os << item.comment;
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/* protect item->name with quotes if needed */
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if (item.name.find(' ') != std::string::npos ||
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item.name[0] == '[') {
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os << "\"" << item.name << "\"";
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} else {
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os << item.name;
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}
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os << " = " << item.value.value_or("") << "\n";
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}
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}
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os << this->comment;
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os.flush();
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os.close();
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if (os.fail()) return false;
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/*
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* POSIX (and friends) do not guarantee that when a file is closed it is
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* flushed to the disk. So we manually flush it do disk if we have the
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* APIs to do so. We only need to flush the data as the metadata itself
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* (modification date etc.) is not important to us; only the real data is.
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*/
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#if defined(_POSIX_SYNCHRONIZED_IO) && _POSIX_SYNCHRONIZED_IO > 0
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int f = open(file_new.c_str(), O_RDWR);
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int ret = fdatasync(f);
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close(f);
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if (ret != 0) return false;
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#endif
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std::error_code ec;
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std::filesystem::rename(OTTD2FS(file_new), OTTD2FS(filename), ec);
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if (ec) {
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Debug(misc, 0, "Renaming {} to {} failed; configuration not saved: {}", file_new, filename, ec.message());
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}
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#ifdef __EMSCRIPTEN__
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EM_ASM(if (window["openttd_syncfs"]) openttd_syncfs());
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#endif
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return true;
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}
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/* virtual */ FILE *IniFile::OpenFile(const std::string &filename, Subdirectory subdir, size_t *size)
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{
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/* Open the text file in binary mode to prevent end-of-line translations
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* done by ftell() and friends, as defined by K&R. */
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return FioFOpenFile(filename, "rb", subdir, size);
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}
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/* virtual */ void IniFile::ReportFileError(const char * const pre, const char * const buffer, const char * const post)
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{
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ShowInfo("{}{}{}", pre, buffer, post);
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}
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