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110 lines
2.4 KiB
110 lines
2.4 KiB
/*
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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_fstat.hpp"
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#include "fs_lseek.hpp"
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#include "fs_read.hpp"
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#include "fs_write.hpp"
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#include <vector>
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using std::vector;
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namespace l
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{
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static
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int
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writen(const int fd_,
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const char *buf_,
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const size_t size_)
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{
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ssize_t rv;
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size_t nleft;
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nleft = size_;
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do
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{
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rv = fs::write(fd_,buf_,nleft);
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if((rv == -1) && (errno == EINTR))
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continue;
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if(rv == -1)
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return -1;
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nleft -= rv;
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buf_ += rv;
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}
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while(nleft > 0);
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return size_;
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}
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static
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int
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copydata_readwrite(const int src_fd_,
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const int dst_fd_,
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const size_t count_)
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{
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ssize_t nr;
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ssize_t nw;
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ssize_t bufsize;
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size_t totalwritten;
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vector<char> buf;
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bufsize = (1024 * 1024);
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buf.resize(bufsize);
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totalwritten = 0;
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while(totalwritten < count_)
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{
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nr = fs::read(src_fd_,&buf[0],bufsize);
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if(nr == 0)
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return totalwritten;
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if((nr == -1) && (errno == EINTR))
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continue;
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if(nr == -1)
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return -1;
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nw = l::writen(dst_fd_,&buf[0],nr);
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if(nw == -1)
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return -1;
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totalwritten += nw;
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}
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return totalwritten;
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}
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}
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namespace fs
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{
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int
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copydata_readwrite(const int src_fd_,
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const int dst_fd_)
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{
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int rv;
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struct stat st;
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rv = fs::fstat(src_fd_,&st);
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if(rv == -1)
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return -1;
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return l::copydata_readwrite(src_fd_,
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dst_fd_,
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st.st_size);
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}
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}
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