px4-firmware/apps/nshlib/nsh_console.h

/****************************************************************************
 * apps/nshlib/nsh_console.h
 *
 *   Copyright (C) 2007-2012 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.
 *
 ****************************************************************************/

#ifndef __APPS_NSHLIB_NSH_CONSOLE_H
#define __APPS_NSHLIB_NSH_CONSOLE_H

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <sys/types.h>

#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include <errno.h>

/****************************************************************************
 * Definitions
 ****************************************************************************/
/* Method access macros */

#define nsh_clone(v)           (v)->clone(v)
#define nsh_release(v)         (v)->release(v)
#define nsh_write(v,b,n)       (v)->write(v,b,n)
#define nsh_linebuffer(v)      (v)->linebuffer(v)
#define nsh_redirect(v,f,s)    (v)->redirect(v,f,s)
#define nsh_undirect(v,s)      (v)->undirect(v,s)
#define nsh_exit(v,s)          (v)->exit(v,s)

#ifdef CONFIG_CPP_HAVE_VARARGS
# define nsh_output(v, fmt...) (v)->output(v, ##fmt)
#else
# define nsh_output            vtbl->output
#endif

/* Size of info to be saved in call to nsh_redirect */

#define SAVE_SIZE (sizeof(int) + sizeof(FILE*) + sizeof(bool))

/* Are we using the NuttX console for I/O?  Or some other character device? */

#ifdef CONFIG_NSH_CONDEV
#  define INFD(p)      ((p)->cn_confd)
#  define INSTREAM(p)  ((p)->cn_constream)
#  define OUTFD(p)     ((p)->cn_confd)
#  define OUTSTREAM(p) ((p)->cn_constream)
#else
#  define INFD(p)      0
#  define INSTREAM(p)  stdin
#  define OUTFD(p)     1
#  define OUTSTREAM(p) stdout
#endif

/****************************************************************************
 * Public Types
 ****************************************************************************/
/* This describes a generic console front-end */

struct nsh_vtbl_s
{
  /* This function pointers are "hooks" into the front end logic to
   * handle things like output of command results, redirection, etc.
   * -- all of which must be done in a way that is unique to the nature
   * of the front end.
   */

#ifndef CONFIG_NSH_DISABLEBG
  FAR struct nsh_vtbl_s *(*clone)(FAR struct nsh_vtbl_s *vtbl);
  void (*addref)(FAR struct nsh_vtbl_s *vtbl);
  void (*release)(FAR struct nsh_vtbl_s *vtbl);
#endif
  ssize_t (*write)(FAR struct nsh_vtbl_s *vtbl, FAR const void *buffer, size_t nbytes);
  int (*output)(FAR struct nsh_vtbl_s *vtbl, const char *fmt, ...);
  FAR char *(*linebuffer)(FAR struct nsh_vtbl_s *vtbl);
  void (*redirect)(FAR struct nsh_vtbl_s *vtbl, int fd, FAR uint8_t *save);
  void (*undirect)(FAR struct nsh_vtbl_s *vtbl, FAR uint8_t *save);
  void (*exit)(FAR struct nsh_vtbl_s *vtbl, int exitstatus) noreturn_function;

  /* Parser state data */

  struct nsh_parser_s np;
};

/* This structure describes a console front-end that is based on stdin and
 * stdout (which is all of the supported console types at the time being).
 */

struct console_stdio_s
{
  /* NSH front-end call table */

  struct nsh_vtbl_s cn_vtbl;

  /* NSH input/output streams */

#ifdef CONFIG_NSH_CONDEV
  int    cn_confd;     /* Console I/O file descriptor */
#endif
  int    cn_outfd;     /* Output file descriptor (possibly redirected) */
#ifdef CONFIG_NSH_CONDEV
  FILE  *cn_constream; /* Console I/O stream (possibly redirected) */
#endif
  FILE  *cn_outstream; /* Output stream */

  /* Line input buffer */

  char   cn_line[CONFIG_NSH_LINELEN];
};



/****************************************************************************
 * Public Data
 ****************************************************************************/

/****************************************************************************
 * Public Function Prototypes
 ****************************************************************************/

/* Defined in nsh_console.c *************************************************/

FAR struct console_stdio_s *nsh_newconsole(void);

#endif /* __APPS_NSHLIB_NSH_CONSOLE_H */