fix crash in dselect on window resize

ChangeLog

@@ -1,3 +1,7 @@
+Wed Oct 13 17:51:17 CEST 1999 Wichert Akkerman <wakkerma@debian.org>
+
+  * Merge patch from Ben Collins to fix windowresizing in dselect
+
 Tue Oct 12 17:15:08 CEST 1999 Wichert Akkerman <wakkerma@debian.org>
 
   * don't die if we can't open a package in dpkg-scanpackages, just print

dselect/dselect.h

@@ -27,6 +27,17 @@
 
 #include <signal.h>
 
+#if defined(SIGWINCH) && defined(TIOCGWINSZ) && defined(NCURSES_VERSION)
+#define CAN_RESIZE 1
+#else
+#define CAN_RESIZE 0
+#endif
+
+#if CAN_RESIZE
+static RETSIGTYPE adjust(int sig);
+static int          interrupted;
+#endif
+
 struct helpmenuentry {
   char key;
   const struct helpmessage *msg;

dselect/main.cc

@@ -96,6 +96,32 @@ static void usage(void) {
        stdout)) werr("stdout");
 }
 
+#if CAN_RESIZE
+/*
+ * This uses functions that are "unsafe", but it seems to work on SunOS and
+ * Linux.  The 'wrefresh(curscr)' is needed to force the refresh to start from
+ * the top of the screen -- some xterms mangle the bitmap while resizing.
+ *
+ * Borrowed from the ncurses example view.c
+ */
+static RETSIGTYPE adjust(int sig)
+{
+  if (waiting || sig == 0) {
+    struct winsize size;
+
+    if (ioctl(fileno(stdout), TIOCGWINSZ, &size) == 0) {
+      resizeterm(size.ws_row, size.ws_col);
+      wrefresh(curscr);       /* Linux needs this */
+      show_all();
+    }
+    interrupted = FALSE;
+  } else {
+    interrupted = TRUE;
+  }
+  (void) signal(SIGWINCH, adjust);        /* some systems need this */
+}
+#endif  /* CAN_RESIZE */
+
 /* These are called by C code, so need to have C calling convention */
 extern "C" {
 
@@ -280,6 +306,10 @@ urqresult urq_quit(void) {
 int main(int, const char *const *argv) {
   jmp_buf ejbuf;
 
+#if CAN_RESIZE
+  (void) signal(SIGWINCH, adjust); /* arrange interrupts to resize */
+#endif
+
   if (setjmp(ejbuf)) { /* expect warning about possible clobbering of argv */
     cursesoff();
     error_unwind(ehflag_bombout); exit(2);

dselect/pkglist.cc

@@ -493,6 +493,10 @@ pkginfo **packagelist::display() {
 
   if (debug) fprintf(debug,"packagelist[%p]::display() entering loop\n",this);
   for (;;) {
+#if CAN_RESIZE
+    if (interrupted)
+      adjust(0);
+#endif
     if (whatinfo_height) wcursyncup(whatinfowin);
     if (doupdate() == ERR) ohshite("doupdate failed");
     signallist= this;