/*\
 *  libLB - The LBPP support library
 *  Copyright (C) 2001   Anthony Liguori <ajl13@bellatlantic.net>
 *
 *  libLB is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  libLB 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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
\*/

#include <assert.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdlib.h>
#include <ctype.h>

#include "lb.h"
#include "basic_io.h"


void LB_INITIO_0(LBContext *cxt)
{
  LBDevice *dev = 0;

  dev = lb_register_dev(cxt, "input", "stdio");
  dev->dev_type = LB_DEV_STREAM | LB_DEV_RDONLY;

  dev->open = (LBDevOpen)&lb_open_file_input;
  dev->close = (LBDevClose)&lb_close_file;

  dev->eof = (LBDevEOF)&lb_eof_file;
  dev->lof = (LBDevLOF)&lb_lof_file;

  dev->read_str = (LBDevReadStr)&lb_read_file_str;
  dev->read_db = (LBDevReadDb)&lb_read_file_db;

  dev = lb_register_dev(cxt, "output", "stdio");
  dev->dev_type = LB_DEV_STREAM | LB_DEV_RDWR;

  dev->open = (LBDevOpen)&lb_open_file_output;
  dev->close = (LBDevClose)&lb_close_file;

  dev->eof = (LBDevEOF)&lb_eof_file;
  dev->lof = (LBDevLOF)&lb_lof_file;

  dev->read_str = (LBDevReadStr)&lb_read_file_str;
  dev->read_db = (LBDevReadDb)&lb_read_file_db;
  dev->write_str = (LBDevWriteStr)&lb_write_file_str;
  dev->write_db = (LBDevWriteDb)&lb_write_file_db;
}

int lb_open_file_input(LBContext *cxt, char *name, Variable *handle)
{
  handle->data.hnd.data = fopen(name, "r");

  return (handle->data.hnd.data != 0);
}

int lb_open_file_output(LBContext *cxt, char *name, Variable *handle)
{
  handle->data.hnd.data = fopen(name, "w+");

  return (handle->data.hnd.data != 0);
}

void lb_close_file(LBContext *cxt, FILE *f)
{
  fclose(f);
}

int lb_eof_file(LBContext *cxt, FILE *f)
{
  return feof(f);
}

int lb_lof_file(LBContext *cxt, FILE *f)
{
  return 0;
}

LBString lb_read_file_str(LBContext *cxt, FILE *f, size_t size)
{
  LBString ret;

  if (size > 0)
    {
      ret = lbstr_empty(size);

      fread(ret->data, ret->size, 1, f);
    }
  else
    {
      ret = lbstr_empty(1024);

      fgets(ret->data, ret->size + 1, f);

      ret->size = strlen(ret->data);

      if (ret->data[ret->size - 1] == '\n')
	{
	  ret->size--;
	  if (ret->data[ret->size - 1] == '\r')
	    {
	      ret->size--;
	    }

	  ret->data[ret->size] = 0;
	}
    }

  return ret;
}

int lb_write_file_str(LBContext *cxt, FILE *f, LBString str)
{
  fwrite(str->data, str->size, 1, f);
  return 0;
}

double lb_read_file_db(LBContext *cxt, FILE *f)
{
  char buf[30];
  int i = 0;

  while (i < (sizeof(buf) - 1) && 
	 (isdigit((buf[i] = getc(f))) || buf[i] == '.'));

  if (i == (sizeof(buf) - 1))
    {
      ungetc(buf[i], f);
    }
  buf[i] = 0;

  return atof(buf);
}

int lb_write_file_db(LBContext *cxt, FILE *f, double db)
{
  fprintf(f, "%f", db);
  return 4;
}