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Sourcecode: fhist version File versions

crlf.c

/*
 *    fhist - file history and comparison tools
 *    Copyright (C) 2000, 2002 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 <error.h>
#include <input/crlf.h>
#include <input/private.h>
#include <trace.h>


typedef struct input_crlf_ty input_crlf_ty;
struct input_crlf_ty
{
      input_ty    inherited;
      input_ty    *fp;
      long        pos;
      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';
            }
      }
      if (c >= 0)
            this->pos++;
#ifdef DEBUG
      if (c < 0)
            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 long
itell(input_ty *fp)
{
      input_crlf_ty     *this;

      this = (input_crlf_ty *)fp;
      trace(("input_crlf::tell => %ld\n", this->pos));
      return this->pos;
}


static const char *
name(input_ty *p)
{
      input_crlf_ty     *this;

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


static long
length(input_ty *p)
{
      trace(("input_crlf::length => -1\n"));
      return -1;
}


static input_vtbl_ty vtbl =
{
      sizeof(input_crlf_ty),
      destruct,
      input_generic_read,
      get,
      itell,
      name,
      length,
};


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->pos = 0;
      this->delete_on_close = delete_on_close;
      trace(("return %08lX\n", (long)result));
      trace(("}\n"));
      return result;
}

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