It slightly annoyed me that tbl -h suicided. Try to prevent that.
And while at it try to make -ms et al work.

Notes:
Sun May 1 13:18:17 EDT 2005 rsc
    Thanks.  Tbl is weird.


Reference: /n/sources/patch/applied/tbl-argcfix
Date: Fri Apr 29 23:28:55 CES 2005
Reviewed-by: rsc

--- /sys/src/cmd/tbl/t1.c	Fri Apr 29 23:27:51 2005
+++ /sys/src/cmd/tbl/t1.c	Fri Apr 29 23:27:48 2005
@@ -2,8 +2,8 @@
 #
 # include "t.h"
 
-# define MACROS "/usr/lib/tmac.s"
-# define PYMACS "/usr/lib/tmac.m"
+# define MACROS "/sys/lib/tmac/tmac.s"
+# define PYMACS "/sys/lib/tmac/tmac.m"
 
 
 # define ever (;;)
@@ -43,9 +43,11 @@
 	sargv = argv;
 	sargc--; 
 	sargv++;
-	if (sargc > 0)
-		swapin();
-	else {
+	if (sargc > 0) {
+		if(swapin() == 0)
+			exits("error");
+		
+	} else {
 		tabin = (Biobuf*)getcore(sizeof(Biobuf), 1);
 		Binit(tabin, 0, OREAD);
 	}