CERT-ARR36-C_b
In this section:
Synopsis
Do not compare two pointers that do not refer to the same array.
Enabled by default
Yes
Severity/Certainty
Medium/Medium
Full description
Do not subtract or compare two pointers that do not refer to the same array. This check is identical to MISRAC2004-17.3, MISRAC2012-Rule-18.3.
Coding standards
- CERT ARR36-C
Do not subtract or compare two pointers that do not refer to the same array
- MISRA C:2004 17.3
(Required) >, >=, <, <= shall not be applied to pointer types except where they point to the same array.
- MISRA C:2012 Rule-18.3
(Required) The relational operators >, >=, < and <= shall not be applied to objects of pointer type except where they point into the same object
Code examples
The following code example fails the check and will give a warning:
void example(void) {
int a[10];
int b[10];
int *p1 = &a[1];
if (p1 < b) {
}
}
The following code example passes the check and will not give a warning about this issue:
void example(void) {
int a[10];
int b[10];
int *p1 = &a[1];
if (p1 < a) {
}
}