nuttx-apps/system/termcurses/termcurses.c

/************************************************************************************
 * drivers/termcurses/termcurses.c
 *
 *   Copyright (C) 2018 Ken Pettit. All rights reserved.
 *   Author: Ken Pettit <pettitkd@gmail.com>
 *
 * 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 <stdint.h>
#include <stdbool.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
#include <debug.h>

#include "tcurses_priv.h"

/************************************************************************************
 * Private Data
 ************************************************************************************/

static struct termcurses_dev_s *g_termcurses_devices[] =
{
#ifdef CONFIG_SYSTEM_TERMCURSES_VT100
  &g_vt100_tcurs,
#endif
  NULL
};

/************************************************************************************
 * Public Functions
 ************************************************************************************/

/************************************************************************************
 * Name: termcurses_initterm
 *
 * Description:
 *    Allocate and initialize a termcurses_s context based on the provided
 *    term_type string.  If the string is NULL, defaults to "vt100".
 *
 ************************************************************************************/

int termcurses_initterm(FAR const char *term_type, int in_fd, int out_fd,
                        FAR struct termcurses_s **dev)
{
  FAR struct termcurses_dev_s *pnext;
  int c;

  /* Set term_type if NULL provided */

  if (term_type == NULL)
    {
      /* Check the "TERM" env variable */

      term_type = getenv("TERM");
      if (term_type == NULL)
        {
          /* Default to vt100 as a last resort */

          term_type = (FAR const char *) "vt100";
        }
    }

  /* Find the selected term_type in the list of registered handlers */

  c = 0;
  pnext = g_termcurses_devices[c];
  while (pnext != NULL)
    {
      /* Test if this item matches the selected term_type */

      if (strstr(pnext->name, term_type) != NULL)
        {
          /* Allocate a new structure for this termcurses */

          if (*dev == NULL)
            {
              /* Call the termcurses_dev init function */

              *dev = pnext->ops->init(in_fd, out_fd);
            }

          return OK;
        }

      /* No match.  Check next item in linked list */

      pnext = g_termcurses_devices[++c];
    }

  /* Not found! */

  *dev = NULL;
  return -ENOSYS;
}

/************************************************************************************
 * Name: termcurses_deinitterm
 *
 * Description:
 *    Free all space for the termcurses terminal and perform any specific
 *    de-initialization tasks.
 *
 ************************************************************************************/

int termcurses_deinitterm(FAR struct termcurses_s *dev)
{
  struct termcurses_colors_s colors;

  /* Ensure terminal has default color scheme */

  colors.fg_red     = 255;
  colors.fg_green   = 255;
  colors.fg_blue    = 255;
  colors.bg_red     = 0;
  colors.bg_green   = 0;
  colors.bg_blue    = 0;
  colors.color_mask = 0xFF;
  termcurses_setcolors(dev, &colors);

  /* For now, simply free the memory */

  free(dev);

  return OK;
}

/************************************************************************************
 * Name: termcurses_moveyx
 *
 * Description:
 *   Move to location yx (row,col) on terminal
 *
 ************************************************************************************/

int termcurses_moveyx(FAR struct termcurses_s *term, int row, int col)
{
  FAR struct termcurses_dev_s *dev = (FAR struct termcurses_dev_s *) term;

  /* Call the dev function */

  if (dev->ops->move)
    {
      return dev->ops->move(term, TCURS_MOVE_YX, col, row);
    }

  return -ENOSYS;
}

/************************************************************************************
 * Name: termcurses_setcolors
 *
 * Description:
 *   Configure output text to render in the specified fg/bg colors.
 *
 ************************************************************************************/

int termcurses_setcolors(FAR struct termcurses_s *term,
                         FAR struct termcurses_colors_s *colors)
{
  FAR struct termcurses_dev_s *dev = (FAR struct termcurses_dev_s *) term;

  /* Call the dev function */

  if (dev->ops->setcolors)
    {
      return dev->ops->setcolors(term, colors);
    }

  return -ENOSYS;
}

/************************************************************************************
 * Name: termcurses_setattribute
 *
 * Description:
 *   Configure output text to render in the specified fg/bg colors.
 *
 ************************************************************************************/

int termcurses_setattribute(FAR struct termcurses_s *term, unsigned long attrib)
{
  FAR struct termcurses_dev_s *dev = (FAR struct termcurses_dev_s *) term;

  /* Call the dev function */

  if (dev->ops->setattrib)
    {
      return dev->ops->setattrib(term, attrib);
    }

  return -ENOSYS;
}

/************************************************************************************
 * Name: termcurses_getwinsize
 *
 * Description:
 *   Get size of terminal screen in terms of character rows and cols.
 *
 ************************************************************************************/

int termcurses_getwinsize(FAR struct termcurses_s *term, FAR struct winsize *winsz)
{
  FAR struct termcurses_dev_s *dev = (FAR struct termcurses_dev_s *) term;

  /* Call the dev function */

  if (dev->ops->getwinsize)
    {
      return dev->ops->getwinsize(term, winsz);
    }

  return -ENOSYS;
}

/************************************************************************************
 * Name: termcurses_getkeycode
 *
 * Description:
 *   Get a translated key code from the terminal input.
 *
 ************************************************************************************/

int termcurses_getkeycode(FAR struct termcurses_s *term, FAR int *specialkey,
      int *keymodifiers)
{
  FAR struct termcurses_dev_s *dev = (FAR struct termcurses_dev_s *) term;

  /* Call the dev function */

  if (dev->ops->getkeycode)
    {
      return dev->ops->getkeycode(term, specialkey, keymodifiers);
    }

  return -1;
}

/************************************************************************************
 * Name: termcurses_checkkey
 *
 * Description:
 *   Check if there is a key waiting to be processed.
 *
 ************************************************************************************/

bool termcurses_checkkey(FAR struct termcurses_s *term)
{
  FAR struct termcurses_dev_s *dev = (FAR struct termcurses_dev_s *) term;

  /* Call the dev function */

  if (dev->ops->checkkey)
    {
      return dev->ops->checkkey(term);
    }

  return 0;
}