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/* -*-c-*- -------------- xmix_device.c :
* Implementation of the functions declared in xmix_device.h
* ------------------------------------------------------------------
* Last change: Time-stamp: "2001-05-10 01:10:25 jao"
* ------------------------------------------------------------------
* Copyright (C) 2001 Free Software Foundation, Inc.
*
* 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 "xmix_device.h"
gchar *DEV_DIR_ = NULL;
const char *DEV_EXT_ = ".dev";
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"
};
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
};
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
};
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_WRITE, mix_io_WRITE
};
/* constructors */
void
construct_device_ (mix_device_t *result, mix_device_type_t type)
{
gchar *name;
name = DEV_DIR_ ? g_strdup_printf ("%s/%s", DEV_DIR_, DEF_NAMES_[type])
: g_strdup (DEF_NAMES_[type]);
construct_device_with_name_ (result, type, name);
g_free (name);
}
void
construct_device_with_name_ (mix_device_t *result,
mix_device_type_t type, const gchar *name)
{
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);
}
result->vtable = DEF_DEV_VTABLE_;
}
void
construct_device_with_file_ (mix_device_t *result,
mix_device_type_t type, FILE *file)
{
result->type = type;
result->file = mix_io_new (file);
result->vtable = DEF_DEV_VTABLE_;
}
/*
Write a block to the device.
*/
static gboolean
write_ (mix_device_t *dev, const mix_word_t *block)
{
gboolean result;
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;
}
static gboolean
read_ (mix_device_t *dev, mix_word_t *block)
{
gboolean result;
if (FMODES_[dev->type] == mix_io_WRITE) return FALSE;
if (MODES_[dev->type] == mix_dev_CHAR)
{
result = mix_io_read_word_array_as_char (GET_CHANNEL_ (dev),
block, SIZES_[dev->type]);
if (result)
{
int c;
FILE *f = mix_io_to_FILE (GET_CHANNEL_ (dev));
do {
c = getc (f);
} while (c != EOF && c != '\n');
}
}
else
result = mix_io_read_word_array (GET_CHANNEL_ (dev),
block, SIZES_[dev->type]);
return result;
}
static gboolean
ioc_ (mix_device_t *dev, mix_short_t arg)
{
int m;
FILE *file;
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;
}
static gboolean
busy_ (const mix_device_t *dev)
{
return (!mix_io_is_ready (GET_CHANNEL_(dev)));
}
static void
destroy_ (mix_device_t *dev)
{
if (dev->type != mix_dev_CONSOLE && GET_FILE_(dev) != NULL)
mix_file_delete (GET_FILE_(dev));
}
static mix_device_vtable_t VTABLE_ = {
write_, read_, ioc_, busy_, destroy_
};
const mix_device_vtable_t * DEF_DEV_VTABLE_ = &VTABLE_;
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