TYPE_ALNUM (3form)

#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.

TYPE_ALNUM

This holds alphanumeric data.

TYPE_ALPHA

This holds alphabetic data.

TYPE_ENUM

This holds an enumerated type.

TYPE_INTEGER

This holds a decimal integer.

TYPE_IPV4

This holds an IPv4 internet address, e.g., "127.0.0.1".

TYPE_NUMERIC

This holds a decimal number, with optional sign and decimal point.

TYPE_REGEXP

This holds a regular expression.

The TYPE_IPV4 variable is an extension not provided by older implementations of the form library.

form(3FORM).