Implement -used.

This doesn't agree with find's output, but I think find is buggy here.
For example, find -used +0 is returning fewer results than find -used 1,
which makes no sense given that 1 is greater than 0.

1 files changed, 15 insertions, 0 deletions

diff --git a/eval.c b/eval.c
index 81d2de7..aae82cd 100644
--- a/eval.c
+++ b/eval.c
@@ -174,6 +174,21 @@ bool eval_acnewer(const struct expr *expr, struct eval_state *state) {
 }
 
 /**
+ * -used test.
+ */
+bool eval_used(const struct expr *expr, struct eval_state *state) {
+	const struct stat *statbuf = fill_statbuf(state);
+	if (!statbuf) {
+		return false;
+	}
+
+	time_t diff = timespec_diff(&statbuf->st_atim, &statbuf->st_ctim);
+	diff /= 60*60*24;
+	printf("%d\n", (int)diff);
+	return do_cmp(expr, diff);
+}
+
+/**
  * -gid test.
  */
 bool eval_gid(const struct expr *expr, struct eval_state *state) {