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V2542. MISRA. Function with a non-void return type should return a value from all exit paths.
This diagnostic rule is based on the software development guidelines developed by MISRA (Motor Industry Software Reliability Association).
The analyzer has detected a function with a non-void return type which doesn't return a value on all the paths of execution. According to the C/C++ standard, this can lead to undefined behavior.
Let's consider an example in which an undefined value is returned only occasionally:
BOOL IsInterestingString(char *s)
{
if (s == NULL)
return FALSE;
if (strlen(s) < 4)
return;
return (s[0] == '#') ? TRUE : FALSE;
}There is a typo in the code. If a string length is less than 4 characters, the function will return an undefined value. Correct variant:
BOOL IsInterestingString(char *s)
{
if (s == NULL)
return FALSE;
if (strlen(s) < 4)
return FALSE;
return (s[0] == '#') ? TRUE : FALSE;
}Note. The analyzer tries to identify the cases when the absence of the return value is not an error. Here's a code example, which will be considered safe:
int Foo()
{
...
exit(10);
}This diagnostic is classified as:
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