# form_variables 3x 2023-10-07 ncurses 6.4 Library calls

    form_variables(3x)               Library calls              form_variables(3x)

## NAME

           TYPE_ALNUM,    TYPE_ALPHA,    TYPE_ENUM,    TYPE_INTEGER,    TYPE_IPV4,
           TYPE_NUMERIC, TYPE_REGEXP - form system global variables

## SYNOPSIS

           #include <form.h>

           FIELDTYPE * TYPE_ALNUM;
           FIELDTYPE * TYPE_ALPHA;
           FIELDTYPE * TYPE_ENUM;
           FIELDTYPE * TYPE_INTEGER;
           FIELDTYPE * TYPE_IPV4;
           FIELDTYPE * TYPE_NUMERIC;
           FIELDTYPE * TYPE_REGEXP;

## DESCRIPTION

           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.

### 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.

## PORTABILITY

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

## SEE ALSO

           form(3x)

    ncurses 6.4                       2023-10-07                form_variables(3x)