c/string/byte/strtoul

Interprets an unsigned integer value in a byte string pointed to by.

The functions sets the pointer pointed to by to point to the character past the last character interpreted. If is a null pointer, it is ignored.

Return value
Integer value corresponding to the contents of on success. If the converted value falls out of range of corresponding return type, range error occurs (errno is set to ) and ulong_max or ullong_max is returned. If no conversion can be performed, is returned.