1 files changed, 25 insertions, 0 deletions

diff --git a/tests/filesys/extended/grow-sparse.c b/tests/filesys/extended/grow-sparse.c
new file mode 100644
index 0000000..6eab210
--- /dev/null
+++ b/tests/filesys/extended/grow-sparse.c
@@ -0,0 +1,25 @@
+/* Tests that seeking past the end of a file and writing will
+   properly zero out the region in between. */
+
+#include <syscall.h>
+#include "tests/lib.h"
+#include "tests/main.h"
+
+static char buf[76543];
+
+void
+test_main (void) 
+{
+  const char *file_name = "testfile";
+  char zero = 0;
+  int fd;
+  
+  CHECK (create (file_name, 0), "create \"%s\"", file_name);
+  CHECK ((fd = open (file_name)) > 1, "open \"%s\"", file_name);
+  msg ("seek \"%s\"", file_name);
+  seek (fd, sizeof buf - 1);
+  CHECK (write (fd, &zero, 1) > 0, "write \"%s\"", file_name);
+  msg ("close \"%s\"", file_name);
+  close (fd);
+  check_file (file_name, buf, sizeof buf);
+}