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#include "write.hpp"
// io/write.cpp - Output to files
//
// Copyright © 2013 Ben Longbons <b.r.longbons@gmail.com>
//
// This file is part of The Mana World (Athena server)
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
#include <sys/uio.h>
#include <fcntl.h>
#include <unistd.h>
#include "../strings/xstring.hpp"
#include "../poison.hpp"
namespace io
{
WriteFile::WriteFile(FD f, bool linebuffered)
: fd(f), lb(linebuffered), buflen(0)
{}
WriteFile::WriteFile(ZString name, bool linebuffered)
: fd(FD::open(name, O_WRONLY | O_CREAT | O_TRUNC, 0666)), lb(linebuffered), buflen(0)
{}
WriteFile::~WriteFile()
{
if (fd != FD())
{
if (!close())
{
abort();
}
}
}
void WriteFile::put(char c)
{
really_put(&c, 1);
}
void WriteFile::really_put(const char *dat, size_t len)
{
if (len + buflen <= sizeof(buf))
{
std::copy(dat, dat + len, buf + buflen);
buflen += len;
goto maybe_linebuffered;
}
{
size_t offset = 0;
while (offset < buflen)
{
// iovec is used for both reading and writing,
// so it declares the pointer to non-const.
iovec iov[2] =
{
{buf + offset, buflen - offset},
{const_cast<char *>(dat), len},
};
ssize_t rv = fd.writev(iov, 2);
if (rv <= 0)
goto write_fail;
offset += rv;
}
offset -= buflen;
dat += offset;
len -= offset;
}
while (len > sizeof(buf))
{
ssize_t rv = fd.write(dat, len);
if (rv <= 0)
goto write_fail;
dat += rv;
len -= rv;
}
std::copy(dat, dat + len, buf);
buflen = len;
maybe_linebuffered:
if (lb)
{
auto rbegin = std::reverse_iterator<char *>(buf + buflen);
auto rend = std::reverse_iterator<char *>(buf);
auto last_nl = std::find(rbegin, rend, '\n');
if (last_nl != rend)
{
size_t offset = 0;
size_t remaining = rend - last_nl;
while (remaining)
{
ssize_t rv = fd.write(buf + offset, remaining);
if (rv <= 0)
goto write_fail;
offset += rv;
remaining -= rv;
}
std::copy(buf + offset, buf + buflen, buf);
buflen -= offset;
}
}
return;
write_fail:
fd.close();
fd = FD();
return;
}
void WriteFile::put_line(XString xs)
{
really_put(xs.data(), xs.size());
if (!xs.endswith('\n'))
put('\n');
}
bool WriteFile::close()
{
size_t off = 0;
while (off < buflen)
{
ssize_t rv = fd.write(buf + off, buflen - off);
if (rv <= 0)
{
fd.close();
fd = FD();
return false;
}
off += rv;
}
FD f = fd;
fd = FD();
return f.close() == 0;
}
bool WriteFile::is_open()
{
return fd != FD();
}
AppendFile::AppendFile(ZString name, bool linebuffered)
: WriteFile(FD::open(name, O_WRONLY | O_CREAT | O_APPEND, 0666), linebuffered)
{}
int do_vprint(WriteFile& out, const char *fmt, va_list ap)
{
int len;
{
va_list ap2;
va_copy(ap2, ap);
len = vsnprintf(nullptr, 0, fmt, ap2);
va_end(ap2);
}
char buffer[len + 1];
vsnprintf(buffer, len + 1, fmt, ap);
out.really_put(buffer, len);
return len;
}
} // namespace io
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