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/* -*-c-*- -------------- mix_device.c :
* Implementation of the functions declared in mix_device.h
* ------------------------------------------------------------------
* Copyright (C) 2000 jose antonio ortega ruiz <jaortega@acm.org>
*
* 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 02111-1307, USA.
*
*/
#include "mix_file.h"
#include "mix_device.h"
/*
Actual definition of a mix device, which can be cast to
a mix file.
*/
struct mix_device_t
{
mix_iochannel_t *file;
mix_device_type_t type;
};
static const char *DEV_EXT_ = ".dev";
static const char *DEF_NAMES_[] = {
"tape0", "tape1", "tape2", "tape3", "tape4", "tape5", "tape6", "tape7",
"disk0", "disk1", "disk2", "disk3", "disk4", "disk5", "disk6", "disk7",
"cardrd", "cardwr", "printer", "console", "paper"
};
static const size_t SIZES_[] = {
100, 100, 100, 100, 100, 100, 100, 100,
100, 100, 100, 100, 100, 100, 100, 100,
16, 16, 24, 14, 14
};
static const mix_device_mode_t MODES_[] = {
mix_dev_BIN, mix_dev_BIN, mix_dev_BIN, mix_dev_BIN, mix_dev_BIN,
mix_dev_BIN, mix_dev_BIN, mix_dev_BIN, mix_dev_BIN, mix_dev_BIN,
mix_dev_BIN, mix_dev_BIN, mix_dev_BIN, mix_dev_BIN, mix_dev_BIN,
mix_dev_BIN, mix_dev_CHAR, mix_dev_CHAR, mix_dev_CHAR, mix_dev_CHAR,
mix_dev_CHAR
};
static const mix_fmode_t FMODES_[] = {
mix_io_RDWRT, mix_io_RDWRT, mix_io_RDWRT, mix_io_RDWRT,
mix_io_RDWRT, mix_io_RDWRT, mix_io_RDWRT, mix_io_RDWRT,
mix_io_RDWRT, mix_io_RDWRT, mix_io_RDWRT, mix_io_RDWRT,
mix_io_RDWRT, mix_io_RDWRT, mix_io_RDWRT, mix_io_RDWRT,
mix_io_READ, mix_io_WRITE, mix_io_WRITE, mix_io_RDWRT, mix_io_WRITE
};
#define GET_CHANNEL_(dev) (dev->file)
#define GET_FILE_(dev) ((mix_file_t *)(dev->file))
mix_device_t *
mix_device_new (mix_device_type_t type)
{
mix_device_t *result = g_new (mix_device_t, 1);
result->type = type;
if (type != mix_dev_CONSOLE) {
result->file = MIX_IOCHANNEL(mix_file_new_with_def_ext (DEF_NAMES_[type],
FMODES_[type],
DEV_EXT_));
} else
result->file = mix_io_new (stdout);
return result;
}
void
mix_device_delete (mix_device_t *dev)
{
if (dev != NULL)
{
if (dev->type != mix_dev_CONSOLE && GET_FILE_(dev) != NULL)
mix_file_delete (GET_FILE_(dev));
g_free (dev);
}
}
mix_device_t *
mix_device_new_with_name (mix_device_type_t type, const gchar *name)
{
mix_device_t *result = NULL;
g_return_val_if_fail (name != NULL, result);
result = g_new (mix_device_t, 1);
result->type = type;
if (type != mix_dev_CONSOLE)
{
result->file = MIX_IOCHANNEL(mix_file_new_with_def_ext (name,
FMODES_[type],
DEV_EXT_));
}
else
{
result->file = mix_io_new (stdout);
}
return result;
}
const char *
mix_device_get_name (mix_device_t *dev)
{
g_return_val_if_fail (dev != NULL, NULL);
return mix_file_base_name(GET_FILE_(dev));
}
/*
Get the device block size
*/
size_t
mix_device_block_size (mix_device_t *dev)
{
g_return_val_if_fail (dev != NULL, 0);
return SIZES_[dev->type];
}
/*
Get the device io mode
*/
mix_device_mode_t
mix_device_mode (mix_device_t *dev)
{
g_return_val_if_fail (dev != NULL, 0);
return MODES_[dev->type];
}
/*
Write a block to the device.
*/
gboolean
mix_device_write (mix_device_t *dev, const mix_word_t *block)
{
gboolean result;
g_return_val_if_fail (dev != NULL, FALSE);
g_return_val_if_fail (block != NULL, FALSE);
if (FMODES_[dev->type] == mix_io_READ) return FALSE;
if (MODES_[dev->type] == mix_dev_CHAR)
result = mix_io_write_word_array_as_char (GET_CHANNEL_ (dev),
block, SIZES_[dev->type]);
else
result = mix_io_write_word_array (GET_CHANNEL_ (dev),
block, SIZES_[dev->type]);
if (result && mix_device_mode(dev) == mix_dev_CHAR)
putc ('\n', mix_io_to_FILE (GET_CHANNEL_ (dev)));
fflush (mix_io_to_FILE (GET_CHANNEL_ (dev)));
return result;
}
gboolean
mix_device_read (mix_device_t *dev, mix_word_t *block)
{
g_return_val_if_fail (dev != NULL, FALSE);
g_return_val_if_fail (block != NULL, FALSE);
if (FMODES_[dev->type] == mix_io_WRITE) return FALSE;
if (MODES_[dev->type] == mix_dev_CHAR)
return mix_io_read_word_array_as_char (GET_CHANNEL_ (dev),
block, SIZES_[dev->type]);
else
return mix_io_read_word_array (GET_CHANNEL_ (dev),
block, SIZES_[dev->type]);
}
gboolean
mix_device_ioc (mix_device_t *dev, mix_short_t arg)
{
int m;
FILE *file;
g_return_val_if_fail (dev != NULL, FALSE);
m = mix_short_magnitude(arg);
if (mix_short_is_negative(arg)) m = -m;
m *= sizeof (mix_word_t) * SIZES_[dev->type];
file = mix_io_to_FILE (GET_CHANNEL_(dev));
if (dev->type >= mix_dev_TAPE_0 && dev->type <= mix_dev_TAPE_7)
{
if (m == 0) rewind (file);
else fseek (file, m, SEEK_CUR);
}
if (dev->type >= mix_dev_DISK_0 && dev->type <= mix_dev_DISK_7)
{
g_return_val_if_fail (m == 0, FALSE);
// position disk
}
if (dev->type == mix_dev_PAPER_TAPE)
{
g_return_val_if_fail (m == 0, FALSE);
rewind (file);
}
return TRUE;
}
gboolean
mix_device_busy (mix_device_t *dev)
{
return (dev != NULL && !mix_io_is_ready(GET_CHANNEL_(dev)));
}
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