Aliases in strtol

Question

This is how strtol should be declared in accordance with § 7.22.1.4 of C11 (n1570):

 #include <stdlib.h> long int strtol (const char *restrict nptr, char **restrict endptr, int base); 

To my knowledge, the restrict keyword means that the object referenced by lvalue *nptr will only be available with it or with its value directly derived from it.

However, many programmers and even experienced ones use strtol as follows:

 #include <stdlib.h> strtol (p, &p, 10); 

In this case **endptr == **&p == *p == *nptr , and the behavior is undefined. Right?

Answer 1

No. Nothing is available through **endptr in **endptr . Only *endptr , a completely separate entity, is available.