PATCH: 3.1.5-pws-17: window size

[Peter Stephenson <pws@ibmth.df.unipi.it>]

This is supposed to bring the 3.1.5 code up to the 3.0.6 code for window
changing.  It seems to fix the bug reported by Tatsuo Furukawa in 6148, or
at least it doesn't crash for me any more.  Unsetting COLUMNS, then setting
it to 0, then sending a SIGWINCH to the current process does seem to get
COLUMNS correct again.

--- Src/init.c.winsize	Sat May  8 14:48:41 1999
+++ Src/init.c	Sat May  8 14:48:46 1999
@@ -641,11 +641,13 @@
     wrappers = NULL;
 
 #ifdef TIOCGWINSZ
-    adjustwinsize();
+    adjustwinsize(0);
 #else
-    /* Using zero below sets the defaults from termcap */
-    setiparam("COLUMNS", 0);
-    setiparam("LINES", 0);
+    /* columns and lines are normally zero, unless something different *
+     * was inhereted from the environment.  If either of them are zero *
+     * the setiparam calls below set them to the defaults from termcap */
+    setiparam("COLUMNS", columns);
+    setiparam("LINES", lines);
 #endif
 
 #ifdef HAVE_GETRLIMIT
--- Src/jobs.c.winsize	Fri Mar 12 12:19:35 1999
+++ Src/jobs.c	Sat May  8 14:50:27 1999
@@ -199,7 +199,7 @@
 	if (mypgrp != pgrp && inforeground &&
 	    (jn->gleader == pgrp || (pgrp > 1 && kill(-pgrp, 0) == -1))) {
 	    attachtty(mypgrp);
-	    adjustwinsize();   /* check window size and adjust if necessary */
+	    adjustwinsize(0);   /* check window size and adjust if necessary */
 	}
     }
 
--- Src/params.c.winsize	Sat May  8 14:31:51 1999
+++ Src/params.c	Sat May  8 15:06:04 1999
@@ -1966,23 +1966,11 @@
 void
 zlevarsetfn(Param pm, long x)
 {
-    if ((long *)pm->u.data == & columns) {
-	if(x <= 0)
-	    x = tccolumns > 0 ? tccolumns : 80;
-	if (x > 2)
-	    termflags &= ~TERM_NARROW;
-	else
-	    termflags |= TERM_NARROW;
-    } else if ((long *)pm->u.data == & lines) {
-	if(x <= 0)
-	    x = tclines > 0 ? tclines : 24;
-	if (x > 2)
-	    termflags &= ~TERM_SHORT;
-	else
-	    termflags |= TERM_SHORT;
-    }
+    long *p = (long *)pm->u.data;
 
-    *((long *)pm->u.data) = x;
+    *p = x;
+    if (p == &lines || p == &columns)
+	adjustwinsize(2 + (p == &columns));
 }
 
 /* Function to set value of generic special scalar    *
--- Src/signals.c.winsize	Sat May  8 14:51:21 1999
+++ Src/signals.c	Sat May  8 14:51:32 1999
@@ -504,7 +504,7 @@
 
 #ifdef SIGWINCH
     case SIGWINCH:
-        adjustwinsize();  /* check window size and adjust */
+        adjustwinsize(1);  /* check window size and adjust */
 	if (sigtrapped[SIGWINCH])
 	    dotrap(SIGWINCH);
         break;
--- Src/utils.c.winsize	Wed May  5 09:34:38 1999
+++ Src/utils.c	Sat May  8 14:44:16 1999
@@ -852,27 +852,64 @@
 /**/
 int winchanged;
 #endif
- 
-/* check the size of the window and adjust if necessary */
+
+/* check the size of the window and adjust if necessary. *
+ * The value of from:					 *
+ *   0: called from update_job or setupvals		 *
+ *   1: called from the SIGWINCH handler		 *
+ *   2: the user have just changed LINES manually	 *
+ *   3: the user have just changed COLUMNS manually      */
 
 /**/
 void
-adjustwinsize(void)
+adjustwinsize(int from)
 {
-#ifdef TIOCGWINSZ
     int oldcols = columns, oldrows = lines;
 
+#ifdef TIOCGWINSZ
+    static int userlines, usercols;
+
     if (SHTTY == -1)
 	return;
 
-    ioctl(SHTTY, TIOCGWINSZ, (char *)&shttyinfo.winsize);
-    setiparam("COLUMNS", shttyinfo.winsize.ws_col);
-    setiparam("LINES", shttyinfo.winsize.ws_row);
-    if (zleactive && (oldcols != columns || oldrows != lines)) {
+    if (from == 2)
+	userlines = lines > 0;
+    if (from == 3)
+	usercols = columns > 0;
+
+    if (!ioctl(SHTTY, TIOCGWINSZ, (char *)&shttyinfo.winsize)) {
+	if (!userlines || from == 1)
+	    lines = shttyinfo.winsize.ws_row;
+	if (!usercols || from == 1)
+	    columns = shttyinfo.winsize.ws_col;
+    }
+#endif   /* TIOCGWINSZ */
+
+    if (lines <= 0)
+	lines = tclines > 0 ? tclines : 24;
+    if (columns <= 0)
+	columns = tccolumns > 0 ? tccolumns : 80;
+    if (lines > 2)
+	termflags &= ~TERM_SHORT;
+    else
+	termflags |= TERM_SHORT;
+    if (columns > 2)
+	termflags &= ~TERM_NARROW;
+    else
+	termflags |= TERM_NARROW;
+
+#ifdef TIOCGWINSZ
+    if (interact && from >= 2) {
+	shttyinfo.winsize.ws_row = lines;
+	shttyinfo.winsize.ws_col = columns;
+	ioctl(SHTTY, TIOCSWINSZ, (char *)&shttyinfo.winsize);
+    }
+#endif
+
+    if (zleactive && (from >= 2 || oldcols != columns || oldrows != lines)) {
 	resetneeded = winchanged = 1;
 	zrefresh();
     }
-#endif   /* TIOCGWINSZ */
 }
 
 /* Move a fd to a place >= 10 and mark the new fd in fdtable.  If the fd *

-- 
Peter Stephenson <pws@ibmth.df.unipi.it>       Tel: +39 050 844536
WWW:  http://www.ifh.de/~pws/
Dipartimento di Fisica, Via Buonarroti 2, 56127 Pisa, Italy