forked from Archive/PX4-Autopilot
258 lines
7.6 KiB
C
Executable File
258 lines
7.6 KiB
C
Executable File
/****************************************************************************
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* nuttx/graphics/nxconsole/nxcon_driver.c
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*
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* Copyright (C) 2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <stdbool.h>
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#include <string.h>
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#include <fcntl.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/fs/fs.h>
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#include "nxcon_internal.h"
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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static int nxcon_open(FAR struct file *filep);
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static ssize_t nxcon_write(FAR struct file *filep, FAR const char *buffer,
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size_t buflen);
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/* This is the common NX driver file operations */
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#ifdef CONFIG_NXCONSOLE_NXKBDIN
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const struct file_operations g_nxcon_drvrops =
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{
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nxcon_open, /* open */
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0, /* close */
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nxcon_read, /* read */
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nxcon_write, /* write */
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0, /* seek */
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0 /* ioctl */
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#ifndef CONFIG_DISABLE_POLL
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,
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nxcon_poll /* poll */
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#endif
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};
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#else /* CONFIG_NXCONSOLE_NXKBDIN */
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const struct file_operations g_nxcon_drvrops =
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{
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nxcon_open, /* open */
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0, /* close */
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0, /* read */
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nxcon_write, /* write */
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0, /* seek */
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0 /* ioctl */
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#ifndef CONFIG_DISABLE_POLL
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,
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0 /* poll */
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#endif
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};
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#endif /* CONFIG_NXCONSOLE_NXKBDIN */
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxcon_open
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****************************************************************************/
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static int nxcon_open(FAR struct file *filep)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct nxcon_state_s *priv = inode->i_private;
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DEBUGASSERT(filep && filep->f_inode);
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/* Get the driver structure from the inode */
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inode = filep->f_inode;
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priv = (FAR struct nxcon_state_s *)inode->i_private;
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DEBUGASSERT(priv);
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/* Verify that the driver is opened for write-only access */
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#ifndef CONFIG_NXCONSOLE_NXKBDIN
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if ((filep->f_oflags & O_RDOK) != 0)
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{
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gdbg("ERROR: Attempted open with read access\n");
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return -EACCES;
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}
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#endif
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/* Assign the driver structure to the file */
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filep->f_priv = priv;
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return OK;
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}
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/****************************************************************************
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* Name: nxcon_write
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****************************************************************************/
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static ssize_t nxcon_write(FAR struct file *filep, FAR const char *buffer,
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size_t buflen)
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{
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FAR struct nxcon_state_s *priv;
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enum nxcon_vt100state_e state;
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ssize_t remaining;
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char ch;
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int ret;
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/* Recover our private state structure */
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DEBUGASSERT(filep && filep->f_priv);
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priv = (FAR struct nxcon_state_s *)filep->f_priv;
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/* Get exclusive access */
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ret = nxcon_semwait(priv);
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if (ret < 0)
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{
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return ret;
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}
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/* Hide the cursor while we update the display */
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nxcon_hidecursor(priv);
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/* Loop writing each character to the display */
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for (remaining = (ssize_t)buflen; remaining > 0; remaining--)
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{
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/* Get the next character from the user buffer */
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ch = *buffer++;
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/* Check if this character is part of a VT100 escape sequence */
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do
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{
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/* Is the character part of a VT100 escape sequnce? */
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state = nxcon_vt100(priv, ch);
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switch (state)
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{
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/* Character is not part of a VT100 escape sequence (and no
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* characters are buffer.
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*/
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default:
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case VT100_NOT_CONSUMED:
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{
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/* We can output the character to the window */
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nxcon_putc(priv, (uint8_t)ch);
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}
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break;
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/* The full VT100 escape sequence was processed (and the new
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* character was consumed)
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*/
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case VT100_PROCESSED:
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/* Character was consumed as part of the VT100 escape processing
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* (but the escape sequence is still incomplete.
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*/
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case VT100_CONSUMED:
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{
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/* Do nothing... the VT100 logic owns the character */
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}
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break;
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/* Invalid/unsupported character in escape sequence */
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case VT100_ABORT:
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{
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int i;
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/* Add the first unhandled character to the window */
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nxcon_putc(priv, (uint8_t)priv->seq[0]);
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/* Move all buffer characters down one */
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for (i = 1; i < priv->nseq; i++)
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{
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priv->seq[i-1] = priv->seq[i];
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}
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priv->nseq--;
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/* Then loop again and check if what remains is part of a
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* VT100 escape sequence. We could speed this up by
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* checking if priv->seq[0] == ASCII_ESC.
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*/
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}
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break;
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}
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}
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while (state == VT100_ABORT);
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}
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/* Show the cursor at its new position */
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nxcon_showcursor(priv);
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nxcon_sempost(priv);
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return (ssize_t)buflen;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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