Only attempt to truncate regular files in dd.

1 files changed, 4 insertions, 6 deletions

diff --git a/toys/pending/dd.c b/toys/pending/dd.c
index a7b7f5fd..8f4e711e 100644
--- a/toys/pending/dd.c
+++ b/toys/pending/dd.c
@@ -223,13 +223,11 @@ void dd_main()
   bs = TT.out.offset;
   if (!(TT.oflag & _DD_oflag_seek_bytes)) bs *= TT.out.sz;
   if (bs) {
+    struct stat st;
+
     xlseek(TT.out.fd, bs, SEEK_CUR);
-    if (trunc && ftruncate(TT.out.fd, bs)) {
-      struct stat st;
-      if (fstat(TT.out.fd, &st) < 0 || S_ISREG(st.st_mode) || S_ISDIR(st.st_mode)) {
-        perror_exit("unexpected ftruncate failure");
-      }
-    }
+    if (trunc && !fstat(TT.out.fd, &st) && S_ISREG(st.st_mode)
+      && ftruncate(TT.out.fd, bs)) perror_exit("unexpected ftruncate failure");
   }
 
   unsigned long long bytes_left = TT.c_count;