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895bff0617
nuttx/examples/nsh/nsh_serial.c
patacongo 895bff0617 Basic telnet NSH on ARM9 
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@852 42af7a65-404d-4744-a932-0658087f49c3
2008-08-29 21:14:45 +00:00

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/****************************************************************************
* examples/nsh/nsh_serial.h
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 Gregory Nutt 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 <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdarg.h>
#include "nsh.h"
/****************************************************************************
* Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
struct serial_s
{
struct nsh_vtbl_s ss_vtbl;
int ss_refs; /* Reference counts on the instance */
int ss_fd; /* Re-direct file descriptor */
FILE *ss_stream; /* Re-direct stream */
char ss_line[CONFIG_EXAMPLES_NSH_LINELEN];
};
struct serialsave_s
{
int ss_fd; /* Re-direct file descriptor */
FILE *ss_stream; /* Re-direct stream */
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static FAR struct nsh_vtbl_s *nsh_consoleclone(FAR struct nsh_vtbl_s *vtbl);
static void nsh_consoleaddref(FAR struct nsh_vtbl_s *vtbl);
static void nsh_consolerelease(FAR struct nsh_vtbl_s *vtbl);
static int nsh_consoleoutput(FAR struct nsh_vtbl_s *vtbl, const char *fmt, ...);
static FAR char *nsh_consolelinebuffer(FAR struct nsh_vtbl_s *vtbl);
static void nsh_consoleredirect(FAR struct nsh_vtbl_s *vtbl, int fd, FAR ubyte *save);
static void nsh_consoleundirect(FAR struct nsh_vtbl_s *vtbl, FAR ubyte *save);
static void nsh_consoleexit(FAR struct nsh_vtbl_s *vtbl);
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: nsh_allocstruct
****************************************************************************/
static inline FAR struct serial_s *nsh_allocstruct(void)
{
struct serial_s *pstate = (struct serial_s *)malloc(sizeof(struct serial_s));
if (pstate)
{
pstate->ss_vtbl.clone = nsh_consoleclone;
pstate->ss_vtbl.addref = nsh_consoleaddref;
pstate->ss_vtbl.release = nsh_consolerelease;
pstate->ss_vtbl.output = nsh_consoleoutput;
pstate->ss_vtbl.linebuffer = nsh_consolelinebuffer;
pstate->ss_vtbl.redirect = nsh_consoleredirect;
pstate->ss_vtbl.undirect = nsh_consoleundirect;
pstate->ss_vtbl.exit = nsh_consoleexit;
memset(&pstate->ss_vtbl.np, 0, sizeof(struct nsh_parser_s));
pstate->ss_refs = 1;
pstate->ss_fd = 1;
pstate->ss_stream = stdout;
}
return pstate;
}
/****************************************************************************
* Name: nsh_openifnotopen
****************************************************************************/
static int nsh_openifnotopen(struct serial_s *pstate)
{
/* The stream is open in a lazy fashion. This is done because the file
* descriptor may be opened on a different task than the stream.
*/
if (!pstate->ss_stream)
{
pstate->ss_stream = fdopen(pstate->ss_fd, "w");
if (!pstate->ss_stream)
{
return ERROR;
}
}
return 0;
}
/****************************************************************************
* Name: nsh_closeifnotclosed
****************************************************************************/
static void nsh_closeifnotclosed(struct serial_s *pstate)
{
if (pstate->ss_stream == stdout)
{
fflush(stdout);
pstate->ss_fd = 1;
}
else
{
if (pstate->ss_stream)
{
fflush(pstate->ss_stream);
fclose(pstate->ss_stream);
}
else if (pstate->ss_fd >= 0 && pstate->ss_fd != 1)
{
close(pstate->ss_fd);
}
pstate->ss_fd = -1;
pstate->ss_stream = NULL;
}
}
/****************************************************************************
* Name: nsh_consoleoutput
*
* Description:
* Print a string to the currently selected stream.
*
****************************************************************************/
static int nsh_consoleoutput(FAR struct nsh_vtbl_s *vtbl, const char *fmt, ...)
{
FAR struct serial_s *pstate = (FAR struct serial_s *)vtbl;
va_list ap;
int ret;
/* The stream is open in a lazy fashion. This is done because the file
* descriptor may be opened on a different task than the stream. The
* actual open will then occur with the first output from the new task.
*/
if (nsh_openifnotopen(pstate) != 0)
{
return ERROR;
}
va_start(ap, fmt);
ret = vfprintf(pstate->ss_stream, fmt, ap);
va_end(ap);
return ret;
}
/****************************************************************************
* Name: nsh_consolelinebuffer
*
* Description:
* Return a reference to the current line buffer
*
****************************************************************************/
static FAR char *nsh_consolelinebuffer(FAR struct nsh_vtbl_s *vtbl)
{
FAR struct serial_s *pstate = (FAR struct serial_s *)vtbl;
return pstate->ss_line;
}
/****************************************************************************
* Name: nsh_consoleclone
*
* Description:
* Make an independent copy of the vtbl
*
****************************************************************************/
static FAR struct nsh_vtbl_s *nsh_consoleclone(FAR struct nsh_vtbl_s *vtbl)
{
FAR struct serial_s *pstate = (FAR struct serial_s *)vtbl;
FAR struct serial_s *pclone = nsh_allocstruct();
pclone->ss_fd = pstate->ss_fd;
pclone->ss_stream = NULL;
return &pclone->ss_vtbl;
}
/****************************************************************************
* Name: nsh_consoleaddref
*
* Description:
* Increment the reference count on the vtbl.
*
****************************************************************************/
static void nsh_consoleaddref(FAR struct nsh_vtbl_s *vtbl)
{
FAR struct serial_s *pstate = (FAR struct serial_s *)vtbl;
pstate->ss_refs++;
}
/****************************************************************************
* Name: nsh_consolerelease
*
* Description:
* Decrement the reference count on the vtbl, releasing it when the count
* decrements to zero.
*
****************************************************************************/
static void nsh_consolerelease(FAR struct nsh_vtbl_s *vtbl)
{
FAR struct serial_s *pstate = (FAR struct serial_s *)vtbl;
if (pstate->ss_refs > 1)
{
pstate->ss_refs--;
}
else
{
nsh_closeifnotclosed(pstate);
free(vtbl);
}
}
/****************************************************************************
* Name: nsh_consoleredirect
*
* Description:
* Set up for redirected output
*
****************************************************************************/
static void nsh_consoleredirect(FAR struct nsh_vtbl_s *vtbl, int fd, FAR ubyte *save)
{
FAR struct serial_s *pstate = (FAR struct serial_s *)vtbl;
FAR struct serialsave_s *ssave = (FAR struct serialsave_s *)save;
(void)nsh_openifnotopen(pstate);
fflush(pstate->ss_stream);
if (ssave)
{
ssave->ss_fd = pstate->ss_fd;
ssave->ss_stream = pstate->ss_stream;
}
else
{
fclose(pstate->ss_stream);
}
pstate->ss_fd = fd;
pstate->ss_stream = NULL;
}
/****************************************************************************
* Name: nsh_consoleredirect
*
* Description:
* Set up for redirected output
*
****************************************************************************/
static void nsh_consoleundirect(FAR struct nsh_vtbl_s *vtbl, FAR ubyte *save)
{
FAR struct serial_s *pstate = (FAR struct serial_s *)vtbl;
FAR struct serialsave_s *ssave = (FAR struct serialsave_s *)save;
nsh_closeifnotclosed(pstate);
pstate->ss_fd = ssave->ss_fd;
pstate->ss_stream = ssave->ss_stream;
}
/****************************************************************************
* Name: nsh_consoleexit
*
* Description:
* Exit the shell task
*
****************************************************************************/
static void nsh_consoleexit(FAR struct nsh_vtbl_s *vtbl)
{
exit(0);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nsh_main
****************************************************************************/
int nsh_consolemain(int argc, char *argv[])
{
FAR struct serial_s *pstate = nsh_allocstruct();
printf(g_nshgreeting);
fflush(pstate->ss_stream);
for (;;)
{
/* Display the prompt string */
fputs(g_nshprompt, pstate->ss_stream);
fflush(pstate->ss_stream);
/* Get the next line of input */
if (fgets(pstate->ss_line, CONFIG_EXAMPLES_NSH_LINELEN, stdin))
{
/* Parse process the command */
(void)nsh_parse(&pstate->ss_vtbl, pstate->ss_line);
fflush(pstate->ss_stream);
}
}
}
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