Aegisub/aegisub/libaegisub/unix/access.cpp

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// Copyright (c) 2010, Amar Takhar <verm@aegisub.org>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
/// @file access.cpp
/// @brief Unix access methods.
/// @ingroup libaegisub unix
#include "config.h"
#include "libaegisub/access.h"
#include <sys/stat.h>
#include <errno.h>
#include <iostream>
#include <fstream>
#include <unistd.h>
#include "libaegisub/util.h"
namespace agi {
namespace acs {
void CheckFileRead(const std::string &file) {
Check(file, acs::FileRead);
}
void CheckFileWrite(const std::string &file) {
Check(file, acs::FileWrite);
}
void CheckDirRead(const std::string &dir) {
Check(dir, acs::DirRead);
}
void CheckDirWrite(const std::string &dir) {
Check(dir, acs::DirWrite);
}
void Check(const std::string &file, acs::Type type) {
struct stat file_stat;
int file_status;
file_status = stat(file.c_str(), &file_stat);
if (file_status != 0) {
switch (errno) {
case ENOENT:
throw FileNotFoundError("File or path not found.");
break;
case EACCES:
throw Read("Access Denied to file, path or path component.");
break;
case EIO:
throw Fatal("Fatal I/O error occurred.");
break;
}
}
switch (type) {
case FileRead:
case FileWrite:
if ((file_stat.st_mode & S_IFREG) == 0)
throw NotAFile("Not a file.");
break;
case DirRead:
case DirWrite:
if ((file_stat.st_mode & S_IFDIR) == 0)
throw NotADirectory("Not a directory.");
break;
}
file_status = access(file.c_str(), R_OK);
if (file_status != 0)
throw Read("File or directory is not readable.");
if (type == DirWrite || type == FileWrite) {
file_status = access(file.c_str(), W_OK);
if (file_status != 0)
throw Write("File or directory is not writable.");
}
}
} // namespace acs
} // namespace agi