more win32tty fixes

There were still some significant startup message problems
with win32tty.

I've spent a lot of time in the debugger tracing through them all.
I think I've got them all worked out now, certainly the ones that
I was aware of.  There may be some I haven't discovered.
Testing welcomed of course!

This patch also attempts to diagnose the error where someone tries
to execute NetHack directly out of a zip file, and provide
them with a (hopefully) helpful message similar to what we
might end up telling them if they wrote in.  If you want
to test that part, you can comment out the line in the
Makefile that adds "dungeon" to nhdat, and delete the nhdat
in your binary and src directories, and "make install".
Then add the value of your TEMP environment variable as a
DATADIR statement in defaults.nh (here's mine):
	DATADIR=C:\DOCUME~1\ALLISO~1\LOCALS~1\Temp
The diagnostic code engages if the game fails to open
dungeon. It then checks to see if it the game dir is the
TEMP directory for your system, and if so it prints the
message.

sys/winnt/winnt.c

@@ -259,6 +259,62 @@ void win32_abort()
 #endif
 	abort();
 }
+
+static char interjection_buf[INTERJECTION_TYPES][1024];
+static int interjection[INTERJECTION_TYPES];
+
+void
+interject_assistance(num, interjection_type, ptr1, ptr2)
+int num;
+int interjection_type;
+genericptr_t ptr1;
+genericptr_t ptr2;
+{
+	switch(num) {
+	    case 1: {
+		char *panicmsg = (char *)ptr1;
+		char *datadir =  (char *)ptr2;
+		char *tempdir = nh_getenv("TEMP");
+		interjection_type = INTERJECT_PANIC;
+		interjection[INTERJECT_PANIC] = 1;
+		/*
+		 * ptr1 = the panic message about to be delivered.
+		 * ptr2 = the directory prefix of the dungeon file
+		 *        that failed to open.
+		 * Check to see if datadir matches tempdir or a
+		 * common windows temp location. If it does, inform
+		 * the user that they are probably trying to run the
+		 * game from within their unzip utility, so the required
+		 * files really don't exist at the location. Instruct
+		 * them to unpack them first.
+		 */
+		if (panicmsg && datadir) {
+		    if (!strncmpi(datadir, "C:\\WINDOWS\\TEMP", 15) ||
+			    strstri(datadir, "TEMP")   ||
+			    (tempdir && strstri(datadir, tempdir))) {
+			(void)strncpy(interjection_buf[INTERJECT_PANIC],
+			"\nThe nature of the error seems to indicate that you may\n"
+			"be attempting to execute the game by double-clicking on \n"
+			"it from within the download distribution zip file.\n\n"
+			"You have to unzip the contents of the zip file into a\n"
+			"folder on your system, and then run \"NetHack.exe\" or \n"
+			"\"NetHackW.exe\" from there.\n\n"
+			"If that is not the situation, you are encouraged to\n"
+			"report the error as shown above.\n\n", 1023);
+		    }
+		}
+	    }
+	    break;
+	}
+}
+
+void
+interject(interjection_type)
+int interjection_type;
+{
+	if (interjection_type >= 0 && interjection_type < INTERJECTION_TYPES)
+		msmsg(interjection_buf[interjection_type]);
+}
 #endif /* WIN32 */
 
 /*winnt.c*/