static int
signed_overflow (signed long value, unsigned bitsize)
{
- signed long max = (signed long)(1UL << (bitsize-1));
- return value < -max || value >= max;
+ signed long max = (signed long) ((1UL << (bitsize - 1)) - 1);
+ return value < -max - 1 || value > max;
}
static int
unsigned_overflow (unsigned long value, unsigned bitsize)
{
- return (value >> bitsize) != 0;
+ return value >> (bitsize - 1) >> 1 != 0;
}
static int