X-Git-Url: https://git.distorted.org.uk/u/mdw/putty/blobdiff_plain/ee07dce4bc01900faf5c9b14e14803705e239b5d..88ea89339783ee587180b645981967f6cb8bcd20:/windows/winsftp.c

diff --git a/windows/winsftp.c b/windows/winsftp.c
index e6b55c1d..33acaf62 100644
--- a/windows/winsftp.c
+++ b/windows/winsftp.c
@@ -486,15 +486,20 @@ extern int select_result(WPARAM, LPARAM);
 int do_eventsel_loop(HANDLE other_event)
 {
     int n, nhandles, nallhandles, netindex, otherindex;
-    long next, ticks;
+    unsigned long next, then;
+    long ticks;
     HANDLE *handles;
     SOCKET *sklist;
     int skcount;
-    long now = GETTICKCOUNT();
+    unsigned long now = GETTICKCOUNT();
 
     if (run_timers(now, &next)) {
-	ticks = next - GETTICKCOUNT();
-	if (ticks < 0) ticks = 0;  /* just in case */
+	then = now;
+	now = GETTICKCOUNT();
+	if (now - then > next - then)
+	    ticks = 0;
+	else
+	    ticks = next - now;
     } else {
 	ticks = INFINITE;
     }
@@ -606,7 +611,7 @@ int ssh_sftp_loop_iteration(void)
     if (p_WSAEventSelect == NULL) {
 	fd_set readfds;
 	int ret;
-	long now = GETTICKCOUNT();
+	unsigned long now = GETTICKCOUNT(), then;
 
 	if (sftp_ssh_socket == INVALID_SOCKET)
 	    return -1;		       /* doom */
@@ -615,13 +620,17 @@ int ssh_sftp_loop_iteration(void)
 	    select_result((WPARAM) sftp_ssh_socket, (LPARAM) FD_WRITE);
 
 	do {
-	    long next, ticks;
+	    unsigned long next;
+	    long ticks;
 	    struct timeval tv, *ptv;
 
 	    if (run_timers(now, &next)) {
-		ticks = next - GETTICKCOUNT();
-		if (ticks <= 0)
-		    ticks = 1;	       /* just in case */
+		then = now;
+		now = GETTICKCOUNT();
+		if (now - then > next - then)
+		    ticks = 0;
+		else
+		    ticks = next - now;
 		tv.tv_sec = ticks / 1000;
 		tv.tv_usec = ticks % 1000 * 1000;
 		ptv = &tv;