char * strchrnul(const char *, int) __ATTR_PURE__
The strchrnul() function is like strchr() except that if c is not found in
s, then it returns a pointer to the null byte at the
end of s, rather than
NULL. (Glibc, GNU extension.)
The strchrnul() function returns a pointer to the matched
character, or a pointer to the null byte at the end of
s (i.e.,
s+strlen(s)) if the character is not found.