form_variables(3x)                                          form_variables(3x)
       TYPE_ALNUM, TYPE_ALPHA, TYPE_ENUM, TYPE_INTEGER, TYPE_IPV4,
       TYPE_NUMERIC, TYPE_REGEXP - form system global variables
       #include <form.h>
       FIELDTYPE * TYPE_ALNUM;
       FIELDTYPE * TYPE_ALPHA;
       FIELDTYPE * TYPE_ENUM;
       FIELDTYPE * TYPE_INTEGER;
       FIELDTYPE * TYPE_IPV4;
       FIELDTYPE * TYPE_NUMERIC;
       FIELDTYPE * TYPE_REGEXP;
       These are building blocks for the form library,  defining  fields  that
       can  be  created  using set_fieldtype(3x).  Each provides functions for
       field- and character-validation, according to the given datatype.
       This holds alphanumeric data.
       This holds alphabetic data.
       This holds an enumerated type.
       This holds a decimal integer.
       This holds an IPv4 internet address, e.g., "127.0.0.1".
       This holds a decimal number, with optional sign and decimal point.
       This holds a regular expression.
       The TYPE_IPV4 variable is an extension not provided by older  implemen-
       tations of the form library.
       form(3x).
                                                            form_variables(3x)