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dd_main.c: Add oseek optional argument.

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- If oseek=N passed, will seek N*bs on output file before writing.
This commit is contained in:
Denis Ryndine 2024-07-05 10:22:22 +10:00 committed by Xiang Xiao
parent ea64cefa33
commit 1852731df8
1 changed files with 19 additions and 2 deletions
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21
system/dd/dd_main.c
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@ -65,6 +65,7 @@ struct dd_s
int outfd; /* File descriptor of the output device */
uint32_t nsectors; /* Number of sectors to transfer */
uint32_t skip; /* The number of sectors skipped on input */
uint32_t seek; /* The number of sectors seeked on output */
bool eof; /* true: The end 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 */
@ -176,7 +177,7 @@ static void print_usage(void)
{
fprintf(stderr, "usage:\n");
fprintf(stderr, " %s if=<infile> of=<outfile> [bs=<sectsize>] "
"[count=<sectors>] [skip=<sectors>]\n", g_dd);
"[count=<sectors>] [skip=<sectors>] [seek=<sectors>]\n", g_dd);
}
/****************************************************************************
@ -226,6 +227,10 @@ int main(int argc, FAR char **argv)
{
dd.skip = atoi(&argv[i][5]);
}
else if (strncmp(argv[i], "seek=", 5) == 0)
{
dd.seek = atoi(&argv[i][5]);
}
}
if (infile == NULL || outfile == NULL)
@ -262,7 +267,7 @@ int main(int argc, FAR char **argv)
if (dd.skip)
{
ret = lseek(dd.infd, dd.skip * dd.sectsize, SEEK_SET);
if (ret < -1)
if (ret < 0)
{
fprintf(stderr, "%s: failed to lseek: %s\n",
g_dd, strerror(errno));
@ -271,6 +276,18 @@ int main(int argc, FAR char **argv)
}
}
if (dd.seek)
{
ret = lseek(dd.outfd, dd.seek * dd.sectsize, SEEK_SET);
if (ret < 0)
{
fprintf(stderr, "%s: failed to lseek on output: %s\n",
g_dd, strerror(errno));
ret = ERROR;
goto errout_with_outf;
}
}
/* Then perform the data transfer */
clock_gettime(CLOCK_MONOTONIC, &ts0);