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Use when code uses arithmetic operations (like subtraction) to check character ranges or ASCII values
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Basierend auf der SOC-Berufsklassifikation
| name | avoid-arithmetic-comparisons |
| description | Use when code uses arithmetic operations (like subtraction) to check character ranges or ASCII values |
A KLEE-coverage code transformation. Applying it rewrites C source so symbolic execution explores more of the program's behavior.
When code uses arithmetic operations (like subtraction) to check character ranges or ASCII values
Replace arithmetic comparisons with direct character literal comparisons (e.g., replace 'a - 97 >= 0' with 'a >= 'a'')
Direct character comparisons create simpler symbolic constraints that are easier for KLEE to reason about, while arithmetic operations introduce additional symbolic expressions that complicate constraint solving
Before:
#include<stdio.h>
int main() {
char a; scanf("%c",&a);
if (a - 97 >= 0) printf("a");
else printf("A");
return 0;
}
After:
#include <stdio.h>
int main()
{
char S[10]; scanf ("%s",S);
putchar(S[0]>='a'?'a':'A');
return 0;
}
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