diff options
| author | Marc Espie <espie@cvs.openbsd.org> | 1999-09-16 20:19:35 +0000 |
|---|---|---|
| committer | Marc Espie <espie@cvs.openbsd.org> | 1999-09-16 20:19:35 +0000 |
| commit | 11bfdccdb15a1e11d71fd52d99653b7dc969a35f (patch) | |
| tree | eeb67f4f8b30b5ea76458bd0f18d04e3203ff11c | |
| parent | 07ed1176daca5784243c78e389e312a142604513 (diff) | |
Do something sensible with division by 0 in expr.
Noticed by aaron@.
| -rw-r--r-- | usr.bin/m4/expr.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/usr.bin/m4/expr.c b/usr.bin/m4/expr.c index 5089d60e9b0..d2e3fce9827 100644 --- a/usr.bin/m4/expr.c +++ b/usr.bin/m4/expr.c @@ -1,4 +1,4 @@ -/* $OpenBSD: expr.c,v 1.7 1999/09/14 08:35:16 espie Exp $ */ +/* $OpenBSD: expr.c,v 1.8 1999/09/16 20:19:34 espie Exp $ */ /* $NetBSD: expr.c,v 1.7 1995/09/28 05:37:31 tls Exp $ */ /* @@ -41,7 +41,7 @@ #if 0 static char sccsid[] = "@(#)expr.c 8.2 (Berkeley) 4/29/95"; #else -static char rcsid[] = "$OpenBSD: expr.c,v 1.7 1999/09/14 08:35:16 espie Exp $"; +static char rcsid[] = "$OpenBSD: expr.c,v 1.8 1999/09/16 20:19:34 espie Exp $"; #endif #endif /* not lint */ @@ -338,10 +338,16 @@ term() vl *= vr; break; case '/': - vl /= vr; + if (vr == 0) + errx(1, "division by zero in eval."); + else + vl /= vr; break; case '%': - vl %= vr; + if (vr == 0) + errx(1, "modulo zero in eval."); + else + vl %= vr; break; } } |