Fixed lock up when system time jumps backwards

Signed-off-by: Christoph Lohmann <20h@r-36.net>

1 files changed, 5 insertions, 2 deletions

diff --git a/st.c b/st.c
index 50b58a7..d0a6218 100644
--- a/st.c
+++ b/st.c
@@ -3687,6 +3687,8 @@ run(void) {
         gettimeofday(&last, NULL);
 
         for(xev = actionfps;;) {
+                long deltatime;
+
                 FD_ZERO(&rfd);
                 FD_SET(cmdfd, &rfd);
                 FD_SET(xfd, &rfd);
@@ -3720,8 +3722,9 @@ run(void) {
                         gettimeofday(&lastblink, NULL);
                         dodraw = 1;
                 }
-                if(TIMEDIFF(now, last) \
-                                > (xev? (1000/xfps) : (1000/actionfps))) {
+                deltatime = TIMEDIFF(now, last);
+                if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
+                                || deltatime < 0) {
                         dodraw = 1;
                         last = now;
                 }