#include <ctype.h>
int
isspecial(int c);
The isspecial() function tests for a special character.
The isspecial() function returns zero if the character tests false and
returns non-zero if the character tests true.
ctype(3), iswspecial(3), isalnum_l
The isspecial() function appeared in 4.4BSD.
BSD March 30, 2004 BSD