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/*
Copyright (c) 2018, Antonio SJ Musumeci <trapexit@spawn.link>
Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
#include "errno.hpp"
#include "fs_fstat.hpp"
#include "fs_lseek.hpp"
#include "fs_read.hpp"
#include "fs_write.hpp"
#include <vector>
using std::vector;
namespace l { static int writen(const int fd_, const char *buf_, const size_t size_) { ssize_t rv; size_t nleft;
nleft = size_; do { rv = fs::write(fd_,buf_,nleft); if((rv == -1) && (errno == EINTR)) continue; if(rv == -1) return -1;
nleft -= rv; buf_ += rv; } while(nleft > 0);
return size_; }
static int copydata_readwrite(const int src_fd_, const int dst_fd_, const size_t count_) { ssize_t nr; ssize_t nw; ssize_t bufsize; size_t totalwritten; vector<char> buf;
bufsize = (1024 * 1024); buf.resize(bufsize);
totalwritten = 0; while(totalwritten < count_) { nr = fs::read(src_fd_,&buf[0],bufsize); if(nr == 0) return totalwritten; if((nr == -1) && (errno == EINTR)) continue; if(nr == -1) return -1;
nw = l::writen(dst_fd_,&buf[0],nr); if(nw == -1) return -1;
totalwritten += nw; }
return totalwritten; } }
namespace fs { int copydata_readwrite(const int src_fd_, const int dst_fd_) { int rv; struct stat st;
rv = fs::fstat(src_fd_,&st); if(rv == -1) return -1;
return l::copydata_readwrite(src_fd_, dst_fd_, st.st_size); } }
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