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Check for division by zero and overflow / underflow.

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tim.schubert@tu-bs.de 2016-10-26 22:20:19 +02:00
parent f3799c90d0
commit 089fe12128
1 changed files with 12 additions and 3 deletions
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15
netcalc.c
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@ -127,15 +127,24 @@ int calc(unsigned int num1, unsigned int num2, char op, unsigned int *result)
// TODO check for over/under flow
switch (op) {
case '+':
*result = num1 + num2;
if (__builtin_uadd_overflow(num1, num2, result)) {
return -1;
}
break;
case '-':
*result = num1 - num2;
if (__builtin_usub_overflow(num1, num2, result)) {
return -1;
}
break;
case '*':
*result = num1 * num2;
if (__builtin_umul_overflow(num1, num2, result)) {
return -1;
}
break;
case '/':
if (num1 == 0 || num2 == 0) {
return -1;
}
*result = num1 / num2;
break;
default: