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$Id: form_variables.3x,v 1.7 2020/12/12 14:45:16 tom Exp $
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 the form_fieldtype(3X) functions. 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 implementations of the form library. form(3X).