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.\" $Id: form_variables.3,v 1.1 2023/10/17 09:52:10 nicm Exp $
.TH form_variables 3 2021-12-25 "ncurses 6.4" "Library calls"
.na
.hy 0
.SH NAME
\fBTYPE_ALNUM\fP,
\fBTYPE_ALPHA\fP,
\fBTYPE_ENUM\fP,
\fBTYPE_INTEGER\fP,
\fBTYPE_IPV4\fP,
\fBTYPE_NUMERIC\fP,
\fBTYPE_REGEXP\fP
\- form system global variables
.ad
.hy
.SH SYNOPSIS
.nf
\fB#include <form.h>\fP
.PP
\fBFIELDTYPE * TYPE_ALNUM;\fP
\fBFIELDTYPE * TYPE_ALPHA;\fP
\fBFIELDTYPE * TYPE_ENUM;\fP
\fBFIELDTYPE * TYPE_INTEGER;\fP
\fBFIELDTYPE * TYPE_IPV4;\fP
\fBFIELDTYPE * TYPE_NUMERIC;\fP
\fBFIELDTYPE * TYPE_REGEXP;\fP
.fi
.SH DESCRIPTION
These are building blocks for the form library,
defining fields that can be created using
the \fBform_fieldtype\fP(3) functions.
Each provides functions for field- and character-validation,
according to the given datatype.
.SS TYPE_ALNUM
This holds alphanumeric data.
.SS TYPE_ALPHA
This holds alphabetic data.
.SS TYPE_ENUM
This holds an enumerated type.
.SS TYPE_INTEGER
This holds a decimal integer.
.SS TYPE_IPV4
This holds an IPv4 internet address, e.g., "127.0.0.1".
.SS TYPE_NUMERIC
This holds a decimal number, with optional sign and decimal point.
.SS TYPE_REGEXP
This holds a regular expression.
.SH PORTABILITY
The \fBTYPE_IPV4\fP variable is an extension not provided by older
implementations of the form library.
.SH SEE ALSO
\fBform\fP(3).