157 lines
4.2 KiB
C++
157 lines
4.2 KiB
C++
/* Copyright (C) 2009 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* =========================================================================
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* File : directory_posix.cpp
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* Project : 0 A.D.
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* Description : file layer on top of POSIX. avoids the need for
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* : absolute paths and provides fast I/O.
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* =========================================================================
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*/
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#include "precompiled.h"
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#include "file_system_posix.h"
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#include <vector>
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#include <algorithm>
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#include <string>
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#include "lib/path_util.h"
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#include "lib/file/path.h"
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#include "lib/posix/posix_filesystem.h"
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struct DirDeleter
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{
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void operator()(DIR* osDir) const
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{
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const int ret = closedir(osDir);
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debug_assert(ret == 0);
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}
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};
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// is name "." or ".."?
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static bool IsDummyDirectory(const char* name)
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{
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if(name[0] != '.')
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return false;
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return (name[1] == '\0' || (name[1] == '.' && name[2] == '\0'));
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}
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/*virtual*/ LibError FileSystem_Posix::GetDirectoryEntries(const Path& path, FileInfos* files, DirectoryNames* subdirectoryNames) const
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{
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// open directory
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errno = 0;
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DIR* pDir = opendir(path.external_file_string().c_str());
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if(!pDir)
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return LibError_from_errno(false);
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shared_ptr<DIR> osDir(pDir, DirDeleter());
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for(;;)
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{
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errno = 0;
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struct dirent* osEnt = readdir(osDir.get());
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if(!osEnt)
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{
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// no error, just no more entries to return
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if(!errno)
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return INFO::OK;
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return LibError_from_errno();
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}
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const char* name = osEnt->d_name;
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RETURN_ERR(path_component_validate(name));
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// get file information (mode, size, mtime)
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struct stat s;
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#if OS_WIN
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// .. wposix readdir has enough information to return dirent
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// status directly (much faster than calling stat).
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RETURN_ERR(readdir_stat_np(osDir.get(), &s));
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#else
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// .. call regular stat().
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errno = 0;
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const Path pathname(path/name);
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if(stat(pathname.external_directory_string().c_str(), &s) != 0)
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return LibError_from_errno();
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#endif
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if(files && S_ISREG(s.st_mode))
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files->push_back(FileInfo(name, s.st_size, s.st_mtime));
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else if(subdirectoryNames && S_ISDIR(s.st_mode) && !IsDummyDirectory(name))
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subdirectoryNames->push_back(name);
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}
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}
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LibError FileSystem_Posix::GetFileInfo(const Path& pathname, FileInfo* pfileInfo) const
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{
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char osPathname[PATH_MAX];
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path_copy(osPathname, pathname.external_directory_string().c_str());
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// if path ends in slash, remove it (required by stat)
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char* last_char = osPathname+strlen(osPathname)-1;
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if(path_is_dir_sep(*last_char))
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*last_char = '\0';
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errno = 0;
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struct stat s;
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memset(&s, 0, sizeof(s));
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if(stat(osPathname, &s) != 0)
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return LibError_from_errno();
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const char* name = path_name_only(osPathname);
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*pfileInfo = FileInfo(name, s.st_size, s.st_mtime);
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return INFO::OK;
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}
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LibError FileSystem_Posix::DeleteDirectory(const Path& path)
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{
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// note: we have to recursively empty the directory before it can
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// be deleted (required by Windows and POSIX rmdir()).
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FileInfos files; DirectoryNames subdirectoryNames;
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RETURN_ERR(GetDirectoryEntries(path, &files, &subdirectoryNames));
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// delete files
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for(size_t i = 0; i < files.size(); i++)
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{
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const Path pathname(path/files[i].Name());
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errno = 0;
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if(unlink(pathname.external_file_string().c_str()) != 0)
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return LibError_from_errno();
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}
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// recurse over subdirectoryNames
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for(size_t i = 0; i < subdirectoryNames.size(); i++)
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RETURN_ERR(DeleteDirectory(path/subdirectoryNames[i]));
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errno = 0;
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if(rmdir(path.external_directory_string().c_str()) != 0)
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return LibError_from_errno();
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return INFO::OK;
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}
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PIFileSystem_Posix CreateFileSystem_Posix()
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{
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return PIFileSystem_Posix(new FileSystem_Posix);
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}
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