/*
 *      cook - file construction tool
 *      Copyright (C) 1999, 2006, 2007 Peter Miller;
 *      All rights reserved.
 *
 *      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, USA.
 *
 * MANIFEST: functions for reading input and filtering out CR LF sequences
 */

#include <common/input/crlf.h>
#include <common/input/private.h>
#include <common/str.h>
#include <common/trace.h>


typedef struct input_crlf_ty input_crlf_ty;
struct input_crlf_ty
{
    input_ty        inherited;
    input_ty        *fp;
    int             delete_on_close;
};


static void
destruct(input_ty *p)
{
    input_crlf_ty   *this;

    trace(("input_crlf::destruct()\n{\n"));
    this = (input_crlf_ty *)p;
    input_pushback_transfer(this->fp, p);
    if (this->delete_on_close)
        input_delete(this->fp);
    this->fp = 0;       /* paranoia */
    trace(("}\n"));
}


static int
get(input_ty *p)
{
    input_crlf_ty   *this;
    int             c;

    trace(("input_crlf::get()\n{\n"));
    this = (input_crlf_ty *)p;
    c = input_getc(this->fp);
    if (c == '\r')
    {
        c = input_getc(this->fp);
        if (c != '\n')
        {
            input_ungetc(this->fp, c);
            c = '\r';
        }
    }
#ifdef DEBUG
    if (c == INPUT_EOF)
        trace(("return EOF;\n"));
    else if (c >= ' ' && c <= '~')
        trace(("return '%c';\n", c));
    else
        trace(("return 0x%02X;\n", c));
#endif
    trace(("}\n"));
    return c;
}


static string_ty *
filename(input_ty *p)
{
    input_crlf_ty   *this;

    trace(("input_crlf::filename\n"));
    this = (input_crlf_ty *)p;
    return input_filename(this->fp);
}


static input_vtbl_ty vtbl =
{
    sizeof(input_crlf_ty),
    destruct,
    input_generic_read,
    get,
    filename,
};


input_ty *
input_crlf(input_ty *fp, int delete_on_close)
{
    input_ty        *result;
    input_crlf_ty   *this;

    trace(("input_crlf(fp = %08lX)\n{\n", (long)fp));
    result = input_new(&vtbl);
    this = (input_crlf_ty *) result;
    this->fp = fp;
    this->delete_on_close = delete_on_close;
    trace(("return %08lX\n", (long)result));
    trace(("}\n"));
    return result;
}