diff options
Diffstat (limited to 'usr.bin/pcc/cpp/cpy.y')
| -rw-r--r-- | usr.bin/pcc/cpp/cpy.y | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/usr.bin/pcc/cpp/cpy.y b/usr.bin/pcc/cpp/cpy.y index ed73fceebcc..37ba7371fbc 100644 --- a/usr.bin/pcc/cpp/cpy.y +++ b/usr.bin/pcc/cpp/cpy.y @@ -1,4 +1,4 @@ -/* $OpenBSD: cpy.y,v 1.2 2007/10/12 07:22:44 otto Exp $ */ +/* $OpenBSD: cpy.y,v 1.3 2007/10/12 18:14:14 stefan Exp $ */ /* * Copyright (c) 2004 Anders Magnusson (ragge@ludd.luth.se). @@ -275,6 +275,18 @@ eval(struct nd *tree) l = eval(tree->nd_left); r = eval(tree->nd_right); t = l.type || r.type; + if (tree->op == '/' || tree->op == '%') { + if ((t && r.v.uval == 0) || (!t && r.v.val == 0)) { + warning(tree->op == '/' ? "division by zero" : + "modulus by zero"); + if (t) + ret.v.uval = 0; + else + ret.v.val = 0; + ret.type = t; + goto out; + } + } switch (tree->op) { EVALBIN(EQ, ==, t, l, r, 0); EVALBIN(NE, !=, t, l, r, 0); @@ -285,7 +297,6 @@ eval(struct nd *tree) EVALBIN('+', +, t, l, r, t); EVALBIN('-', -, t, l, r, t); EVALBIN('*', *, t, l, r, t); - // XXX check /,% by zero EVALBIN('/', /, t, l, r, t); EVALBIN('%', %, t, l, r, t); EVALBIN('&', &, t, l, r, t); |