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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);
}
}