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/* c_streambuf class implementation (non-inline functions).
Copyright (C) 2001-2010 Roberto Bagnara <bagnara@cs.unipr.it>
Copyright (C) 2010-2011 BUGSENG srl (http://bugseng.com)
This file is part of the Parma Polyhedra Library (PPL).
The PPL 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.
The PPL 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., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1307, USA.
For the most up-to-date information see the Parma Polyhedra Library
site: http://www.cs.unipr.it/ppl/ . */
#include <ppl-config.h>
#include "c_streambuf.defs.hh"
namespace Parma_Polyhedra_Library {
c_streambuf::int_type
c_streambuf::uflow() {
int_type c = underflow();
nextc_buf = traits_type::eof();
return c;
}
c_streambuf::int_type
c_streambuf::underflow() {
const int_type eof = traits_type::eof();
if (traits_type::eq_int_type(nextc_buf, eof)) {
char buf;
if (cb_read(&buf, 1) == 1)
nextc_buf = buf;
else
nextc_buf = eof;
}
return nextc_buf;
}
std::streamsize
c_streambuf::xsgetn(char_type* s, std::streamsize n) {
if (n == 0)
return n;
const int_type eof = traits_type::eof();
int a;
if (traits_type::eq_int_type(nextc_buf, eof))
a = 0;
else {
s[0] = nextc_buf;
a = 1;
}
std::streamsize r = cb_read(s + a, n - a) + a;
if (r > 0)
ungetc_buf = traits_type::to_int_type(s[r - 1]);
else
ungetc_buf = traits_type::eof();
return r;
}
c_streambuf::int_type
c_streambuf::pbackfail(int_type c) {
const int_type eof = traits_type::eof();
nextc_buf = traits_type::eq_int_type(c, eof) ? ungetc_buf : c;
ungetc_buf = eof;
return nextc_buf;
}
std::streamsize
c_streambuf::xsputn(const char_type* s, std::streamsize n) {
return cb_write(s, n);
}
c_streambuf::int_type
c_streambuf::overflow(int_type c) {
const int_type eof = traits_type::eof();
if (traits_type::eq_int_type(c, eof))
return sync() ? eof : traits_type::not_eof(c);
else {
char buf = c;
if (cb_write(&buf, 1) == 1)
return c;
else
return eof;
}
}
int
c_streambuf::sync() {
return cb_sync();
}
} // namespace Parma_Polyhedra_Library
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