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 "libaegisub/fs.h"
#include <sys/stat.h>
#include <errno.h>
#include <unistd.h>
#include <boost/filesystem/path.hpp>
namespace agi {
namespace acs {
void Check(agi::fs::path const& file, acs::Type type) {
struct stat file_stat;
int file_status = stat(file.c_str(), &file_stat);
if (file_status != 0) {
switch (errno) {
case ENOENT:
throw fs::FileNotFound(file);
case EACCES:
throw fs::ReadDenied(file);
case EIO:
throw fs::FileSystemUnknownError("Fatal I/O error in 'stat' on path: " + file.string());
}
}
switch (type) {
case FileRead:
case FileWrite:
if ((file_stat.st_mode & S_IFREG) == 0)
throw fs::NotAFile(file);
break;
case DirRead:
case DirWrite:
if ((file_stat.st_mode & S_IFDIR) == 0)
throw fs::NotADirectory(file);
break;
}
file_status = access(file.c_str(), R_OK);
if (file_status != 0)
throw fs::ReadDenied(file);
if (type == DirWrite || type == FileWrite) {
file_status = access(file.c_str(), W_OK);
if (file_status != 0)
throw fs::WriteDenied(file);
}
}
} // namespace acs
} // namespace agi