[PATCH] Implement most ICCCM rules for selection handling.

From: Markus Wichmann <nullplan_AT_gmx.net>
Date: Sat, 11 Apr 2015 21:21:34 +0200

ICCCM mandates the use of real timestamps to interact with the
selection, to rule out race conditions if the clients are run at
different speeds. I have implemented the low hanging fruit, putting the
timestamps into text selection. Also, ICCCM mandates a check for whether
XSetSelectionOwner() worked. Not sure my version is correct, though.

---
 st.c | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)
diff --git a/st.c b/st.c
index b2bcfe9..18e8542 100644
--- a/st.c
+++ b/st.c
_AT_@ -423,7 +423,7 @@ static void xsettitle(char *);
 static void xresettitle(void);
 static void xsetpointermotion(int);
 static void xseturgency(int);
-static void xsetsel(char *);
+static void xsetsel(char *, Time);
 static void xtermclear(int, int, int, int);
 static void xunloadfont(Font *);
 static void xunloadfonts(void);
_AT_@ -449,7 +449,7 @@ static void selinit(void);
 static void selnormalize(void);
 static inline bool selected(int, int);
 static char *getsel(void);
-static void selcopy(void);
+static void selcopy(Time);
 static void selscroll(int, int);
 static void selsnap(int, int *, int *, int);
 static int x2col(int);
_AT_@ -984,8 +984,8 @@ getsel(void) {
 }
 
 void
-selcopy(void) {
-	xsetsel(getsel());
+selcopy(Time t) {
+	xsetsel(getsel(), t);
 }
 
 void
_AT_@ -997,7 +997,7 @@ selnotify(XEvent *e) {
 	XSelectionEvent *xsev;
 
 	ofs = 0;
-	xsev = (XSelectionEvent *)e;
+	xsev = &e->xselection;
 	if (xsev->property == None)
 	    return;
 	do {
_AT_@ -1083,6 +1083,9 @@ selrequest(XEvent *e) {
 	xev.selection = xsre->selection;
 	xev.target = xsre->target;
 	xev.time = xsre->time;
+        if (xsre->property == None)
+            xsre->property = xsre->target;
+
 	/* reject */
 	xev.property = None;
 
_AT_@ -1125,11 +1128,13 @@ selrequest(XEvent *e) {
 }
 
 void
-xsetsel(char *str) {
+xsetsel(char *str, Time t) {
 	free(sel.primary);
 	sel.primary = str;
 
-	XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
+	XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, t);
+        if (XGetSelectionOwner(xw.dpy, XA_PRIMARY) != xw.win)
+            selclear(0);
 }
 
 void
_AT_@ -1146,7 +1151,7 @@ brelease(XEvent *e) {
 			selclear(NULL);
 		} else {
 			getbuttoninfo(e);
-			selcopy();
+			selcopy(e->xbutton.time);
 		}
 		sel.mode = 0;
 		tsetdirt(sel.nb.y, sel.ne.y);
-- 
2.1.3
--J2SCkAp4GZ/dPZZf--

Received on Mon Sep 17 2001 - 00:00:00 CEST