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btest portability fix

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address review comment about shifting corner-case
This commit is contained in:
Vern Paxson 2022-08-02 19:36:25 -07:00
parent ea3d25b380
commit c10885e5f9
2 changed files with 4 additions and 4 deletions
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6
src/Expr.cc
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@ -963,10 +963,10 @@ ValPtr BinaryExpr::Fold(Val* v1, Val* v2) const
{
if ( is_integral )
{
if ( i1 < 1 )
if ( i1 < 0 )
RuntimeError("left shifting a negative number is undefined");
i3 = i1 << i2;
i3 = i1 << static_cast<zeek_uint_t>(i2);
}
else if ( is_unsigned )
@ -979,7 +979,7 @@ ValPtr BinaryExpr::Fold(Val* v1, Val* v2) const
case EXPR_RSHIFT:
{
if ( is_integral )
i3 = i1 >> i2;
i3 = i1 >> static_cast<zeek_uint_t>(i2);
else if ( is_unsigned )
u3 = u1 >> u2;