/****************************************************************************
* nuttx/graphics/nxterm/nxterm_driver.c
*
* Copyright (C) 2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdbool.h>
#include <string.h>
#include <fcntl.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/fs/fs.h>
#include "nxterm.h"
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int nxterm_open(FAR struct file *filep);
static ssize_t nxterm_write(FAR struct file *filep, FAR const char *buffer,
size_t buflen);
/****************************************************************************
* Public Data
****************************************************************************/
/* This is the common NX driver file operations */
#ifdef CONFIG_NXTERM_NXKBDIN
const struct file_operations g_nxterm_drvrops =
{
nxterm_open, /* open */
0, /* close */
nxterm_read, /* read */
nxterm_write, /* write */
0, /* seek */
0 /* ioctl */
#ifndef CONFIG_DISABLE_POLL
,
nxterm_poll /* poll */
#endif
};
#else /* CONFIG_NXTERM_NXKBDIN */
const struct file_operations g_nxterm_drvrops =
{
nxterm_open, /* open */
0, /* close */
0, /* read */
nxterm_write, /* write */
0, /* seek */
0 /* ioctl */
#ifndef CONFIG_DISABLE_POLL
,
0 /* poll */
#endif
};
#endif /* CONFIG_NXTERM_NXKBDIN */
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: nxterm_open
****************************************************************************/
static int nxterm_open(FAR struct file *filep)
{
FAR struct inode *inode = filep->f_inode;
FAR struct nxterm_state_s *priv = inode->i_private;
DEBUGASSERT(filep && filep->f_inode);
/* Get the driver structure from the inode */
inode = filep->f_inode;
priv = (FAR struct nxterm_state_s *)inode->i_private;
DEBUGASSERT(priv);
/* Verify that the driver is opened for write-only access */
#ifndef CONFIG_NXTERM_NXKBDIN
if ((filep->f_oflags & O_RDOK) != 0)
{
gdbg("ERROR: Attempted open with read access\n");
return -EACCES;
}
#endif
/* Assign the driver structure to the file */
filep->f_priv = priv;
return OK;
}
/****************************************************************************
* Name: nxterm_write
****************************************************************************/
static ssize_t nxterm_write(FAR struct file *filep, FAR const char *buffer,
size_t buflen)
{
FAR struct nxterm_state_s *priv;
enum nxterm_vt100state_e state;
ssize_t remaining;
char ch;
int ret;
/* Recover our private state structure */
DEBUGASSERT(filep && filep->f_priv);
priv = (FAR struct nxterm_state_s *)filep->f_priv;
/* Get exclusive access */
ret = nxterm_semwait(priv);
if (ret < 0)
{
return ret;
}
/* Hide the cursor while we update the display */
nxterm_hidecursor(priv);
/* Loop writing each character to the display */
for (remaining = (ssize_t)buflen; remaining > 0; remaining--)
{
/* Get the next character from the user buffer */
ch = *buffer++;
/* Check if this character is part of a VT100 escape sequence */
do
{
/* Is the character part of a VT100 escape sequnce? */
state = nxterm_vt100(priv, ch);
switch (state)
{
/* Character is not part of a VT100 escape sequence (and no
* characters are buffer.
*/
default:
case VT100_NOT_CONSUMED:
{
/* We can output the character to the window */
nxterm_putc(priv, (uint8_t)ch);
}
break;
/* The full VT100 escape sequence was processed (and the new
* character was consumed)
*/
case VT100_PROCESSED:
/* Character was consumed as part of the VT100 escape processing
* (but the escape sequence is still incomplete.
*/
case VT100_CONSUMED:
{
/* Do nothing... the VT100 logic owns the character */
}
break;
/* Invalid/unsupported character in escape sequence */
case VT100_ABORT:
{
int i;
/* Add the first unhandled character to the window */
nxterm_putc(priv, (uint8_t)priv->seq[0]);
/* Move all buffer characters down one */
for (i = 1; i < priv->nseq; i++)
{
priv->seq[i-1] = priv->seq[i];
}
priv->nseq--;
/* Then loop again and check if what remains is part of a
* VT100 escape sequence. We could speed this up by
* checking if priv->seq[0] == ASCII_ESC.
*/
}
break;
}
}
while (state == VT100_ABORT);
}
/* Show the cursor at its new position */
nxterm_showcursor(priv);
nxterm_sempost(priv);
return (ssize_t)buflen;
}
/****************************************************************************
* Public Functions
****************************************************************************/