/****************************************************************************
* nuttx/graphics/nxconsole/nxcon_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 "nxcon_internal.h"
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int nxcon_open(FAR struct file *filep);
static ssize_t nxcon_write(FAR struct file *filep, FAR const char *buffer,
size_t buflen);
/****************************************************************************
* Public Data
****************************************************************************/
/* This is the common NX driver file operations */
const struct file_operations g_nxcon_drvrops =
{
nxcon_open, /* open */
0, /* close */
0, /* read */
nxcon_write, /* write */
0, /* seek */
0 /* ioctl */
#ifndef CONFIG_DISABLE_POLL
, 0 /* poll */
#endif
};
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: nxcon_open
****************************************************************************/
static int nxcon_open(FAR struct file *filep)
{
FAR struct inode *inode = filep->f_inode;
FAR struct nxcon_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 nxcon_state_s *)inode->i_private;
DEBUGASSERT(priv);
/* Verify that the driver is opened for write-only access */
if ((filep->f_oflags & O_RDOK) != 0)
{
gdbg("Attempted open with read access\n");
return -EACCES;
}
/* Assign the driver structure to the file */
filep->f_priv = priv;
return OK;
}
/****************************************************************************
* Name: nxcon_write
****************************************************************************/
static ssize_t nxcon_write(FAR struct file *filep, FAR const char *buffer,
size_t buflen)
{
FAR struct nxcon_state_s *priv;
char ch;
int lineheight;
int ret;
/* Recover our private state structure */
DEBUGASSERT(filep && filep->f_priv);
priv = (FAR struct nxcon_state_s *)filep->f_priv;
/* Get exclusive access */
ret = sem_wait(&priv->exclsem);
if (ret < 0)
{
return ret;
}
/* Loop writing each character to the display */
lineheight = (priv->fheight + CONFIG_NXCONSOLE_LINESEPARATION);
while (buflen-- > 0)
{
/* Ignore carriage returns */
ch = *buffer++;
if (ch == '\r')
{
continue;
}
/* Will another character fit on this line? */
if (priv->fpos.x + priv->fwidth > priv->wndo.wsize.w)
{
#ifndef CONFIG_NXCONSOLE_NOWRAP
/* No.. move to the next line */
nxcon_newline(priv);
/* If we were about to output a newline character, then don't */
if (ch == '\n')
{
continue;
}
#else
/* No.. Ignore all further characters until a newline is encountered */
if (ch != '\n')
{
continue;
}
#endif
}
/* Check if we need to scroll up (handling a corner case where
* there may be more than one newline).
*/
while (priv->fpos.y >= priv->wndo.wsize.h - lineheight)
{
nxcon_scroll(priv, lineheight);
}
/* Finally, we can output the character */
nxcon_putc(priv, (uint8_t)ch);
}
sem_post(&priv->exclsem);
return buflen;
}
/****************************************************************************
* Public Functions
****************************************************************************/
