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-rw-r--r--nandwrite.c54
1 files changed, 34 insertions, 20 deletions
diff --git a/nandwrite.c b/nandwrite.c
index 14414b6..70579a3 100644
--- a/nandwrite.c
+++ b/nandwrite.c
@@ -52,11 +52,13 @@ static void display_help(int status)
" -m, --markbad Mark blocks bad if write fails\n"
" -n, --noecc Write without ecc\n"
" -N, --noskipbad Write without bad block skipping\n"
-" -o, --oob Image contains oob data\n"
-" -O, --onlyoob Image contains oob data and only write the oob part\n"
-" -s addr, --start=addr Set start address (default is 0)\n"
-" -p, --pad Pad to page size\n"
+" -o, --oob Input contains oob data\n"
+" -O, --onlyoob Input contains oob data and only write the oob part\n"
+" -s addr, --start=addr Set output start address (default is 0)\n"
+" -p, --pad Pad writes to page size\n"
" -b, --blockalign=1|2|4 Set multiple of eraseblocks to align to\n"
+" --input-skip=length Skip |length| bytes of the input file\n"
+" --input-size=length Only read |length| bytes of the input file\n"
" -q, --quiet Don't display progress messages\n"
" -h, --help Display this help and exit\n"
" --version Output version information and exit\n"
@@ -83,6 +85,8 @@ static void display_version(void)
static const char *standard_input = "-";
static const char *mtd_device, *img;
static long long mtdoffset = 0;
+static long long inputskip = 0;
+static long long inputsize = 0;
static bool quiet = false;
static bool writeoob = false;
static bool onlyoob = false;
@@ -101,7 +105,10 @@ static void process_options(int argc, char * const argv[])
int option_index = 0;
static const char short_options[] = "hb:mnNoOpqs:a";
static const struct option long_options[] = {
+ /* Order of these args with val==0 matters; see option_index. */
{"version", no_argument, 0, 0},
+ {"input-skip", required_argument, 0, 0},
+ {"input-size", required_argument, 0, 0},
{"help", no_argument, 0, 'h'},
{"blockalign", required_argument, 0, 'b'},
{"markbad", no_argument, 0, 'm'},
@@ -127,6 +134,12 @@ static void process_options(int argc, char * const argv[])
case 0: /* --version */
display_version();
break;
+ case 1: /* --input-skip */
+ inputskip = simple_strtoll(optarg, &error);
+ break;
+ case 2: /* --input-size */
+ inputsize = simple_strtoll(optarg, &error);
+ break;
}
break;
case 'q':
@@ -299,26 +312,27 @@ int main(int argc, char * const argv[])
pagelen = mtd.min_io_size + ((writeoob) ? mtd.oob_size : 0);
- /*
- * For the standard input case, the input size is merely an
- * invariant placeholder and is set to the write page
- * size. Otherwise, just use the input file size.
- *
- * TODO: Add support for the -l,--length=length option (see
- * previous discussion by Tommi Airikka <tommi.airikka@ericsson.com> at
- * <http://lists.infradead.org/pipermail/linux-mtd/2008-September/
- * 022913.html>
- */
-
if (ifd == STDIN_FILENO) {
- imglen = pagelen;
+ imglen = inputsize ? : pagelen;
+ if (inputskip) {
+ errmsg("seeking stdin does not work");
+ goto closeall;
+ }
} else {
- struct stat st;
- if (fstat(ifd, &st)) {
- sys_errmsg("unable to stat input image");
+ if (!inputsize) {
+ struct stat st;
+ if (fstat(ifd, &st)) {
+ sys_errmsg("unable to stat input image");
+ goto closeall;
+ }
+ imglen = st.st_size;
+ } else
+ imglen = inputsize;
+
+ if (inputskip && lseek(ifd, inputskip, SEEK_CUR) == -1) {
+ sys_errmsg("lseek input by %lld failed", inputskip);
goto closeall;
}
- imglen = st.st_size;
}
/* Check, if file is page-aligned */