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82 lines
2.0 KiB
82 lines
2.0 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 "fs_copydata_readwrite.hpp"
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#include "errno.hpp"
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#include "fs_pread.hpp"
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#include "fs_pwriten.hpp"
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#include <vector>
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static
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s64
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_copydata_readwrite(const int src_fd_,
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const int dst_fd_,
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const u64 count_,
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const u64 bufsize_)
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{
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int err;
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s64 nr;
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s64 nw;
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s64 offset;
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std::vector<char> buf;
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if(bufsize_ == 0)
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return -EINVAL;
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buf.resize(bufsize_);
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offset = 0;
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while(offset < (s64)count_)
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{
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nr = fs::pread(src_fd_,&buf[0],buf.size(),offset);
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switch(nr)
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{
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case -EINTR:
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case -EAGAIN:
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continue;
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case 0:
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return offset;
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default:
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if(nr < 0)
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return nr;
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break;
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}
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nw = fs::pwriten(dst_fd_,&buf[0],nr,offset,&err);
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if(err < 0)
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return err;
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offset += nw;
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}
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return offset;
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}
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#define BUF_SIZE (256 * 1024)
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s64
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fs::copydata_readwrite(const int src_fd_,
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const int dst_fd_,
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const u64 count_)
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{
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return ::_copydata_readwrite(src_fd_,
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dst_fd_,
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count_,
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BUF_SIZE);
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}
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