mirror of https://github.com/trapexit/mergerfs.git
96 lines
2.4 KiB
C++
96 lines
2.4 KiB
C++
/*
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ISC License
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Copyright (c) 2018, Antonio SJ Musumeci <trapexit@spawn.link>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "errno.hpp"
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#include "fs_open.hpp"
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#include "fs_path.hpp"
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#include "rnd.hpp"
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#include <limits.h>
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#include <cstdlib>
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#include <string>
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#include <tuple>
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#define PAD_LEN 16
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#define MAX_ATTEMPTS 3
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static char const CHARS[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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static size_t const CHARS_SIZE = (sizeof(CHARS) - 1);
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namespace l
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{
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static
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std::string
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generate_tmp_path(std::string const base_)
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{
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fs::Path path;
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std::string filename;
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filename = '.';
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for(int i = 0; i < PAD_LEN; i++)
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filename += CHARS[RND::rand64(CHARS_SIZE)];
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path = base_;
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path /= filename;
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return path.string();
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}
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}
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namespace fs
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{
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std::tuple<int,std::string>
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mktemp_in_dir(std::string const dirpath_,
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int const flags_)
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{
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int fd;
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int count;
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int flags;
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std::string tmp_filepath;
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fd = -1;
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count = MAX_ATTEMPTS;
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flags = (flags_ | O_EXCL | O_CREAT | O_TRUNC);
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while(count-- > 0)
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{
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tmp_filepath = l::generate_tmp_path(dirpath_);
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fd = fs::open(tmp_filepath,flags,S_IWUSR);
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if((fd == -1) && (errno == EEXIST))
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continue;
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if(fd == -1)
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return std::make_tuple(-errno,std::string());
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return std::make_tuple(fd,tmp_filepath);
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}
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return std::make_tuple(-EEXIST,std::string());
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}
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std::tuple<int,std::string>
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mktemp(std::string const filepath_,
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int const flags_)
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{
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ghc::filesystem::path filepath{filepath_};
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return fs::mktemp_in_dir(filepath.parent_path(),flags_);
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}
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}
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