lib/input/remove_escaped_newlines.cc

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//
// nis-util - NIS Administration Utilities
// Copyright (C) 2012 Peter Miller
//
// 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, see <http://www.gnu.org/licenses/>.
//

#include <lib/input/remove_escaped_newlines.h>


input_remove_escaped_newlines::~input_remove_escaped_newlines()
{
}


input_remove_escaped_newlines::input_remove_escaped_newlines(
    const input::pointer &a_deeper
) :
    deeper(a_deeper)
{
}


input_remove_escaped_newlines::pointer
input_remove_escaped_newlines::create(const input::pointer &a_deeper)
{
    return pointer(new input_remove_escaped_newlines(a_deeper));
}


size_t
input_remove_escaped_newlines::read_inner(source_location &data_locn,
    void *vdata, size_t data_size)
{
    data_locn = deeper->get_source_location();
    unsigned char *data_begin = (unsigned char *)vdata;
    unsigned char *data = data_begin;
    unsigned char *data_end = data + data_size;
    while (data < data_end)
    {
        int c = deeper->get();
        if (c == input::eof)
            break;
        if (c == '\\')
        {
            int c2 = deeper->get();
            if (c2 == '\n')
            {
                // The line number count has discontinuities for each
                // escaped newline, so stop here.
                break;
            }
            deeper->unget(c2);
        }
        *data++ = c;
        if (c == '\n')
            break;
    }
    return (data - data_begin);
}


// vim: set ts=8 sw=4 et :