@deftypefn Supplemental char* strstr (const char *@var{string}, const char *@var{sub})
This function searches for the substring @var{sub} in the string
-@var{string}, not including the terminating NUL characters. A pointer
-to the first occurance of @var{sub} is returned, or NULL if the
+@var{string}, not including the terminating null characters. A pointer
+to the first occurrence of @var{sub} is returned, or NULL if the
substring is absent. If @var{sub} points to a string with zero
length, the function returns @var{string}.