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NSH dd command test with block devices

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1242 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo
2008-11-15 16:36:32 +00:00
parent 4a9e922943
commit d6aa80bbd0
6 changed files with 137 additions and 173 deletions
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examples/nsh/README.txt
+25 -2
View File
@@ -252,15 +252,38 @@ o cp <source-path> <dest-path>
o dd if=<infile> of=<outfile> [bs=<sectsize>] [count=<sectors>] [skip=<sectors>]
Copy blocks from <infile> to <outfile>.
Copy blocks from <infile> to <outfile>. <nfile> or <outfile> may
be the path to a standard file, a character device, or a block device.
Example:
Examples:
1. Read from character device, write to regular file. This will
create a new file of the specified size filled with zero.
nsh> dd if=/dev/zero of=/tmp/zeros bs=64 count=16
nsh> ls -l /tmp
/tmp:
-rw-rw-rw- 1024 ZEROS
2. Read from character device, write to block device. This will
fill the entire block device with zeros.
nsh> ls -l /dev
/dev:
brw-rw-rw- 0 ram0
crw-rw-rw- 0 zero
nsh> dd if=/dev/zero of=/dev/ram0
3. Read from a block devic, write to a character device. This
will read the entire block device and dump the contents in
the bit bucket.
nsh> ls -l /dev
/dev:
crw-rw-rw- 0 null
brw-rw-rw- 0 ram0
nsh> dd if=/dev/ram0 of=/dev/null
o echo [<string|$name> [<string|$name>...]]
Copy the sequence of strings and expanded environment variables to
examples/nsh/nsh_ddcmd.c
+63 -32
View File
@@ -209,11 +209,24 @@ static int dd_writeblk(struct dd_s *dd)
ssize_t nbytes;
off_t offset = (dd->sector - dd->skip) * dd->sectsize;
/* Write the sector at the specified offset */
nbytes = bchlib_write(DD_OUTHANDLE, (char*)dd->buffer, offset, dd->sectsize);
if (nbytes < 0)
{
nsh_output(dd->vtbl, g_fmtcmdfailed, g_dd, "bshlib_write", NSH_ERRNO);
return ERROR;
/* bchlib_write return -EFBIG on attempts to write past the end of
* the device.
*/
if (nbytes == -EFBIG)
{
dd->eof = TRUE; /* Set end-of-file */
}
else
{
nsh_output(dd->vtbl, g_fmtcmdfailed, g_dd, "bshlib_write", NSH_ERRNO_OF(-nbytes));
return ERROR;
}
}
return OK;
@@ -238,7 +251,7 @@ static int dd_writech(struct dd_s *dd)
nbytes = write(DD_OUTFD, buffer, dd->sectsize - written);
if (nbytes < 0)
{
nsh_output(dd->vtbl, g_fmtcmdfailed, g_dd, "write", NSH_ERRNO);
nsh_output(dd->vtbl, g_fmtcmdfailed, g_dd, "write", NSH_ERRNO_OF(-nbytes));
return ERROR;
}
@@ -263,11 +276,14 @@ static int dd_readblk(struct dd_s *dd)
nbytes = bchlib_read(DD_INHANDLE, (char*)dd->buffer, offset, dd->sectsize);
if (nbytes < 0)
{
nsh_output(dd->vtbl, g_fmtcmdfailed, g_dd, "bshlib_read", NSH_ERRNO);
nsh_output(dd->vtbl, g_fmtcmdfailed, g_dd, "bshlib_read", NSH_ERRNO_OF(-nbytes));
return ERROR;
}
/* bchlib_read return 0 on attempts to write past the end of the device. */
dd->nbytes = nbytes;
dd->eof = (nbytes == 0);
return OK;
}
#endif
@@ -287,7 +303,7 @@ static int dd_readch(struct dd_s *dd)
nbytes = read(DD_INFD, buffer, dd->sectsize - dd->nbytes);
if (nbytes < 0)
{
nsh_output(dd->vtbl, g_fmtcmdfailed, g_dd, "read", NSH_ERRNO);
nsh_output(dd->vtbl, g_fmtcmdfailed, g_dd, "read", NSH_ERRNO_OF(-nbytes));
return ERROR;
}
@@ -337,7 +353,7 @@ static inline int dd_infopen(const char *name, struct dd_s *dd)
type = dd_filetype(name);
if (type < 0)
{
nsh_output(dd->vtbl, g_fmtcmdfailed, g_dd, "stat", NSH_ERRNO);
nsh_output(dd->vtbl, g_fmtcmdfailed, g_dd, "stat", NSH_ERRNO_OF(-type));
return type;
}
@@ -449,9 +465,9 @@ static inline int dd_outfopen(const char *name, struct dd_s *dd)
int cmd_dd(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
{
struct dd_s dd;
const char *infile = NULL;
const char *outfile = NULL;
int ret;
char *infile = NULL;
char *outfile = NULL;
int ret = ERROR;
int i;
/* Initialize the dd structure */
@@ -490,11 +506,11 @@ int cmd_dd(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
{
if (strncmp(argv[i], "if=", 3) == 0)
{
infile = &argv[i][3];
infile = nsh_getfullpath(vtbl, &argv[i][3]);
}
else if (strncmp(argv[i], "of=", 3) == 0)
{
outfile = &argv[i][3];
outfile = nsh_getfullpath(vtbl, &argv[i][3]);
}
else if (strncmp(argv[i], "bs=", 3) == 0)
{
@@ -514,14 +530,14 @@ int cmd_dd(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
if (!infile || !outfile)
{
nsh_output(vtbl, g_fmtargrequired, g_dd);
return ERROR;
goto errout_with_paths;
}
#endif
if (dd.skip < 0 || dd.skip > dd.nsectors)
{
nsh_output(vtbl, g_fmtarginvalid, g_dd);
return ERROR;
goto errout_with_paths;
}
/* Allocate the I/O buffer */
@@ -530,7 +546,7 @@ int cmd_dd(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
if (!dd.buffer)
{
nsh_output(vtbl, g_fmtcmdoutofmemory, g_dd);
return ERROR;
goto errout_with_paths;
}
/* Open the input file */
@@ -538,7 +554,7 @@ int cmd_dd(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
ret = dd_infopen(infile, &dd);
if (ret < 0)
{
return ret;
goto errout_with_paths;
}
/* Open the output file */
@@ -562,38 +578,53 @@ int cmd_dd(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
goto errout_with_outf;
}
/* Pad with zero if necessary (at the end of file only) */
/* Has the incoming data stream ended? */
for (i = dd.nbytes; i < dd.sectsize; i++)
if (!dd.eof)
{
dd.buffer[i] = 0;
}
/* Pad with zero if necessary (at the end of file only) */
/* Write one sector to the output file */
if (dd.sector >= dd.skip)
{
ret = DD_WRITE(&dd);
if (ret < 0)
for (i = dd.nbytes; i < dd.sectsize; i++)
{
goto errout_with_outf;
dd.buffer[i] = 0;
}
/* Decrement to show that a sector was written */
/* Write one sector to the output file */
dd.nsectors--;
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++;
}
/* Increment the sector number */
dd.sector++;
}
ret = OK;
errout_with_outf:
DD_INCLOSE(&dd);
errout_with_inf:
DD_OUTCLOSE(&dd);
free(dd.buffer);
errout_with_paths:
if (infile)
{
free(infile);
}
if (outfile)
{
free(outfile);
}
return ret;
}