Und genau dieses Problem passiert dann:

Character string constants of 32 bytes or less are always passed with a length of 32 bytes (padded on the right with blanks). If a character constant is longer than 32 bytes, the whole length of the constant is passed. If the parameter is defined to contain more than 32 bytes, the calling program must pass a constant that contains exactly that number of bytes. Constants longer than 32 characters are not padded to the length expected by the receiving program.