dd: truncate file when using seek= - ubase - suckless linux base utils
HTML git clone git://git.suckless.org/ubase
DIR Log
DIR Files
DIR Refs
DIR README
DIR LICENSE
---
DIR commit 596663c1b1f140c10ba1facede783201d6a876a7
DIR parent e358d74a805829dddf987ff62f42c7631df48e88
HTML Author: Eivind Uggedal <eivind@uggedal.com>
Date: Tue, 15 Mar 2016 21:06:28 +0000
dd: truncate file when using seek=
Diffstat:
M dd.c | 9 +++++++++
1 file changed, 9 insertions(+), 0 deletions(-)
---
DIR diff --git a/dd.c b/dd.c
@@ -108,6 +108,15 @@ prepare_copy(struct dd_config *ddc, int *ifd, int *ofd)
return -1;
}
+ if (ddc->seek) {
+ if (fstat(*ofd, &st) < 0)
+ return -1;
+ if (!S_ISREG(st.st_mode))
+ ;
+ else if (ftruncate(*ofd, ddc->seek) < 0)
+ return -1;
+ }
+
if (lseek(*ifd, ddc->skip, SEEK_CUR) < 0) {
char buffer[ddc->bs];
for (uint64_t i = 0; i < ddc->skip; i += ddc->bs) {