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overflow fix in modulo and division

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This commit is contained in:
albertodemichelis 2016-01-26 00:01:26 +08:00
parent d23b238093
commit 887f121555
1 changed files with 7 additions and 5 deletions
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12
squirrel/sqvm.cpp
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@ -68,12 +68,14 @@ bool SQVM::ARITH_OP(SQUnsignedInteger op,SQObjectPtr &trg,const SQObjectPtr &o1,
switch(op) {
case '+': res = i1 + i2; break;
case '-': res = i1 - i2; break;
case '/': if(i2 == 0) { Raise_Error(_SC("division by zero")); return false; }
res = i1 / i2;
case '/': if (i2 == 0) { Raise_Error(_SC("division by zero")); return false; }
else if (i2 == -1 && i1 == INT_MIN) { Raise_Error(_SC("integer overflow")); return false; }
res = i1 / i2;
break;
case '*': res = i1 * i2; break;
case '%': if(i2 == 0) { Raise_Error(_SC("modulo by zero")); return false; }
res = i1 % i2;
case '%': if (i2 == 0) { Raise_Error(_SC("modulo by zero")); return false; }
else if (i2 == -1 && i1 == INT_MIN) { res = 0; break; }
res = i1 % i2;
break;
default: res = 0xDEADBEEF;
}
@ -1217,7 +1219,7 @@ bool SQVM::Get(const SQObjectPtr &self, const SQObjectPtr &key, SQObjectPtr &des
if(sq_isnumeric(key)){
SQInteger n = tointeger(key);
SQInteger len = _string(self)->_len;
if (n < 0) { n += len; }
if (n < 0) { n += len; }
if (n >= 0 && n < len) {
dest = SQInteger(_stringval(self)[n]);
return true;