goldberg_emulator/overlay_experimental/System/System_internals.cpp

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2022-08-05 08:06:42 +02:00
/*
* Copyright (C) Nemirtingas
* This file is part of System.
*
* System is free software; you can redistribute it
* and/or modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* System 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. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with System; if not, see
* <http://www.gnu.org/licenses/>.
*/
#include "System_internals.h"
#if defined(SYSTEM_OS_WINDOWS)
#define WIN32_LEAN_AND_MEAN
#define VC_EXTRALEAN
#define NOMINMAX
#include <Windows.h>
namespace System {
}
#elif defined(SYSTEM_OS_LINUX)
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
namespace System {
SYSTEM_HIDE_API(std::string, SYSTEM_CALL_DEFAULT) ExpandSymlink(std::string file_path)
{
struct stat file_stat;
std::string link_target;
ssize_t name_len = 128;
while(lstat(file_path.c_str(), &file_stat) >= 0 && S_ISLNK(file_stat.st_mode) == 1)
{
do
{
name_len *= 2;
link_target.resize(name_len);
name_len = readlink(file_path.c_str(), &link_target[0], link_target.length());
} while (name_len == link_target.length());
link_target.resize(name_len);
file_path = std::move(link_target);
}
return file_path;
}
}
#endif