[PATCH] mtd-utils: nanddump: write requested length only

[Gary Bisson <bisson.gary@gmail.com>]

nanddump was always writing a whole page of data into the output
discarding the length actually requested. This patch allows to
write only the remaining length if oob is omitted. In case oob
is needed, it makes sense to copy the entire page.
---
 nanddump.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/nanddump.c b/nanddump.c
index 4ee7ed4..300aca6 100644
--- a/nanddump.c
+++ b/nanddump.c
@@ -445,8 +445,14 @@ int main(int argc, char * const argv[])
 						pretty_buf, PRETTY_BUF_LEN, true, canonical, ofs + i);
 				write(ofd, pretty_buf, strlen(pretty_buf));
 			}
-		} else
-			write(ofd, readbuf, bs);
+		} else {
+			/* Write requested length if oob is omitted */
+			size_t size_left = end_addr - ofs;
+			if (omitoob && (size_left < bs))
+				write(ofd, readbuf, size_left);
+			else
+				write(ofd, readbuf, bs);
+		}
 
 		if (omitoob)
 			continue;
-- 
1.8.5.1