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nuttx-apps/nshlib/nsh_ddcmd.c

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/****************************************************************************
* apps/nshlib/nsh_ddcmd.c
*
* Copyright (C) 2008-2009, 2012, 2015 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 <sys/stat.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <debug.h>
#include <errno.h>
#include "nsh.h"
#include "nsh_console.h"
#if CONFIG_NFILE_DESCRIPTORS > 0 && !defined(CONFIG_NSH_DISABLE_DD)
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* If no sector size is specified wity BS=, then the following default value
* is used.
*/
#define DEFAULT_SECTSIZE 512
/* At present, piping of input and output are not support, i.e., both of=
* and if= arguments are required.
*/
#undef CAN_PIPE_FROM_STD
/****************************************************************************
* Private Types
****************************************************************************/
struct dd_s
{
FAR struct nsh_vtbl_s *vtbl;
int infd; /* File descriptor of the input device */
int outfd; /* File descriptor of the output device */
uint32_t nsectors; /* Number of sectors to transfer */
uint32_t sector; /* The current sector number */
uint32_t skip; /* The number of sectors skipped on input */
bool eof; /* true: The of the input or output file has been hit */
uint16_t sectsize; /* Size of one sector */
uint16_t nbytes; /* Number of valid bytes in the buffer */
uint8_t *buffer; /* Buffer of data to write to the output file */
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
static const char g_dd[] = "dd";
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: dd_write
****************************************************************************/
static int dd_write(struct dd_s *dd)
{
uint8_t *buffer = dd->buffer;
uint16_t written ;
ssize_t nbytes;
/* Is the out buffer full (or is this the last one)? */
written = 0;
do
{
nbytes = write(dd->outfd, buffer, dd->sectsize - written);
if (nbytes < 0)
{
FAR struct nsh_vtbl_s *vtbl = dd->vtbl;
nsh_output(vtbl, g_fmtcmdfailed, g_dd, "write", NSH_ERRNO_OF(-nbytes));
return ERROR;
}
written += nbytes;
buffer += nbytes;
}
while (written < dd->sectsize);
return OK;
}
/****************************************************************************
* Name: dd_read
****************************************************************************/
static int dd_read(struct dd_s *dd)
{
uint8_t *buffer = dd->buffer;
ssize_t nbytes;
dd->nbytes = 0;
do
{
nbytes = read(dd->infd, buffer, dd->sectsize - dd->nbytes);
if (nbytes < 0)
{
FAR struct nsh_vtbl_s *vtbl = dd->vtbl;
nsh_output(vtbl, g_fmtcmdfailed, g_dd, "read", NSH_ERRNO_OF(-nbytes));
return ERROR;
}
dd->nbytes += nbytes;
buffer += nbytes;
}
while (dd->nbytes < dd->sectsize && nbytes > 0);
dd->eof |= (dd->nbytes == 0);
return OK;
}
/****************************************************************************
* Name: dd_infopen
****************************************************************************/
static inline int dd_infopen(const char *name, struct dd_s *dd)
{
dd->infd = open(name, O_RDONLY);
if (dd->infd < 0)
{
FAR struct nsh_vtbl_s *vtbl = dd->vtbl;
nsh_output(vtbl, g_fmtcmdfailed, g_dd, "open", NSH_ERRNO);
return ERROR;
}
return OK;
}
/****************************************************************************
* Name: dd_outfopen
****************************************************************************/
static inline int dd_outfopen(const char *name, struct dd_s *dd)
{
dd->outfd = open(name, O_WRONLY|O_CREAT|O_TRUNC, 0644);
if (dd->outfd < 0)
{
nsh_output(dd->vtbl, g_fmtcmdfailed, g_dd, "open", NSH_ERRNO);
return ERROR;
}
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: cmd_dd
****************************************************************************/
int cmd_dd(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
{
struct dd_s dd;
char *infile = NULL;
char *outfile = NULL;
int ret = ERROR;
int i;
/* Initialize the dd structure */
memset(&dd, 0, sizeof(struct dd_s));
dd.vtbl = vtbl; /* For nsh_output */
dd.sectsize = DEFAULT_SECTSIZE; /* Sector size if 'bs=' not provided */
dd.nsectors = 0xffffffff; /* MAX_UINT32 */
/* If no IF= option is provided on the command line, then read
* from stdin.
*/
#ifdef CAN_PIPE_FROM_STD
dd->infd = 0; /* stdin */
#endif
/* If no OF= option is provided on the command line, then write
* to stdout.
*/
#ifdef CAN_PIPE_FROM_STD
dd->outfd = 1; /* stdout */
#endif
/* Parse command line parameters */
for (i = 1; i < argc; i++)
{
if (strncmp(argv[i], "if=", 3) == 0)
{
infile = nsh_getfullpath(vtbl, &argv[i][3]);
}
else if (strncmp(argv[i], "of=", 3) == 0)
{
outfile = nsh_getfullpath(vtbl, &argv[i][3]);
}
else if (strncmp(argv[i], "bs=", 3) == 0)
{
dd.sectsize = atoi(&argv[i][3]);
}
else if (strncmp(argv[i], "count=", 6) == 0)
{
dd.nsectors = atoi(&argv[i][6]);
}
else if (strncmp(argv[i], "skip=", 5) == 0)
{
dd.skip = atoi(&argv[i][5]);
}
}
#ifndef CAN_PIPE_FROM_STD
if (!infile || !outfile)
{
nsh_output(vtbl, g_fmtargrequired, g_dd);
goto errout_with_paths;
}
#endif
/* Allocate the I/O buffer */
dd.buffer = malloc(dd.sectsize);
if (!dd.buffer)
{
nsh_output(vtbl, g_fmtcmdoutofmemory, g_dd);
goto errout_with_paths;
}
/* Open the input file */
ret = dd_infopen(infile, &dd);
if (ret < 0)
{
goto errout_with_paths;
}
/* Open the output file */
ret = dd_outfopen(outfile, &dd);
if (ret < 0)
{
goto errout_with_inf;
}
/* Then perform the data transfer */
dd.sector = 0;
while (!dd.eof && dd.nsectors > 0)
{
/* Read one sector from from the input */
ret = dd_read(&dd);
if (ret < 0)
{
goto errout_with_outf;
}
/* Has the incoming data stream ended? */
if (!dd.eof)
{
/* Pad with zero if necessary (at the end of file only) */
for (i = dd.nbytes; i < dd.sectsize; i++)
{
dd.buffer[i] = 0;
}
/* Write one sector to the output file */
if (dd.sector >= dd.skip)
{
ret = dd_write(&dd);
if (ret < 0)
{
goto errout_with_outf;
}
/* Decrement to show that a sector was written */
dd.nsectors--;
}
/* Increment the sector number */
dd.sector++;
}
}
ret = OK;
errout_with_outf:
(void)close(dd.outfd);
errout_with_inf:
(void)close(dd.infd);
free(dd.buffer);
errout_with_paths:
if (infile)
{
free(infile);
}
if (outfile)
{
free(outfile);
}
return ret;
}
#endif /* CONFIG_NFILE_DESCRIPTORS && !CONFIG_NSH_DISABLE_DD */
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