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77 lines
1.7 KiB
77 lines
1.7 KiB
/*
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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_base_open.hpp"
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#include <cstdlib>
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#include <string>
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#include <limits.h>
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using std::string;
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#define PADLEN 6
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#define MAX_ATTEMPTS 10
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static
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string
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generate_tmp_path(const string &base_)
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{
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string tmp;
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tmp = base_;
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if((tmp.size() + PADLEN + 1) > PATH_MAX)
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tmp.resize(tmp.size() - PADLEN - 1);
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tmp += '.';
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for(int i = 0; i < PADLEN; i++)
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tmp += ('A' + (std::rand() % 26));
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return tmp;
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}
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namespace fs
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{
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int
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mktemp(string &base_,
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const int 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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string tmppath;
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fd = -1;
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count = MAX_ATTEMPTS;
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flags = (flags_ | O_EXCL | O_CREAT);
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while(count-- > 0)
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{
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tmppath = generate_tmp_path(base_);
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fd = fs::open(tmppath,flags,S_IWUSR);
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if((fd == -1) && (errno == EEXIST))
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continue;
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else if(fd != -1)
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base_ = tmppath;
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return fd;
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}
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return (errno=EEXIST,-1);
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}
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}
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