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// Copyright (C) 1999,2000 Bruce Guenter <bruce@untroubled.org>
//
// 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 2 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, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#include "fdbuf.h"
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
///////////////////////////////////////////////////////////////////////////////
// Globals
///////////////////////////////////////////////////////////////////////////////
fdobuf fout(1);
fdobuf ferr(2);
///////////////////////////////////////////////////////////////////////////////
// Class fdobuf
///////////////////////////////////////////////////////////////////////////////
fdobuf::fdobuf(int fdesc, bool dc, unsigned bufsz)
: fdbuf(fdesc, dc, bufsz),
bufpos(0)
{
}
fdobuf::fdobuf(const char* filename, int f, int mode, unsigned bufsz)
: fdbuf(open(filename, O_WRONLY | f, mode), true, bufsz),
bufpos(0)
{
if(fd == -1) {
flags = flag_error;
errnum = errno;
}
}
fdobuf::~fdobuf()
{
flush();
}
bool fdobuf::close()
{
if(!flush())
return false;
lock();
bool r = fdbuf::close();
unlock();
return r;
}
bool fdobuf::operator!() const
{
return error() || closed();
}
bool fdobuf::nflush(bool withsync)
{
if(flags)
return false;
while(bufstart < buflength) {
ssize_t written = _write(buf+bufstart, buflength-bufstart);
if(written < 0) {
flags |= flag_error;
errnum = errno;
return false;
}
else {
bufstart += written;
offset += written;
}
}
buflength = 0;
bufstart = 0;
bufpos = 0;
if(withsync && (fsync(fd) == -1)) {
flags |= flag_error;
errnum = errno;
return false;
}
return true;
}
bool fdobuf::flush()
{
lock();
bool r = nflush(false);
unlock();
return r;
}
bool fdobuf::sync()
{
lock();
bool r = nflush(true);
unlock();
return r;
}
bool fdobuf::write(char ch)
{
if(flags)
return false;
lock();
count = 0;
buf[bufpos++] = ch;
//if(buflength >= bufsize && !nflush(false)) {
// unlock();
// return false;
//}
if(bufpos >= buflength)
buflength = bufpos;
if(buflength >= bufsize && !nflush(false)) {
unlock();
return false;
}
count = 1;
unlock();
return true;
}
bool fdobuf::write_large(const char* data, unsigned datalen)
{
if(flags)
return false;
lock();
count = 0;
if(!nflush(false)) {
unlock();
return false;
}
while(datalen > 0) {
ssize_t written = _write(data, datalen);
if(written < 0) {
flags |= flag_error;
errnum = errno;
unlock();
return false;
}
datalen -= written;
data += written;
offset += written;
count += written;
}
unlock();
return true;
}
bool fdobuf::write(const char* data, unsigned datalen)
{
if(datalen >= bufsize)
return write_large(data, datalen);
if(flags)
return false;
lock();
const char* ptr = data;
count = 0;
// Amount is the number of bytes available in the buffer
unsigned amount = bufsize-bufpos;
while(datalen >= amount) {
// If we get here, this copy will completely fill the buffer,
// requiring a flush
memcpy(buf+bufpos, ptr, amount);
bufpos = bufsize;
buflength = bufsize;
datalen -= amount;
ptr += amount;
if(!nflush(false)) {
unlock();
return false;
}
count += amount;
amount = bufsize-bufpos;
}
// At this point, the remaining data will fit into the buffer
memcpy(buf+bufpos, ptr, datalen);
count += datalen;
bufpos += datalen;
if(bufpos > buflength) buflength = bufpos;
unlock();
return true;
}
ssize_t fdobuf::_write(const char* buf, ssize_t len)
{
return ::write(fd, buf, len);
}
///////////////////////////////////////////////////////////////////////////////
// Manipulators
///////////////////////////////////////////////////////////////////////////////
fdobuf& endl(fdobuf& fd)
{
fd.write("\n", 1);
fd.flush();
return fd;
}
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