redhat man page for field_userptr

form_field_userptr(3X)													    form_field_userptr(3X)

NAME
       form_field_userptr - associate application data with a form field

SYNOPSIS
       #include <form.h>
       int set_field_userptr(FIELD *field, void*userptr);
       void *field_userptr(const FIELD *field);

DESCRIPTION
       Every  form  field  has	a field that can be used to hold application-specific data (that is, the form-driver code leaves it alone).  These
       functions get and set that field.

RETURN VALUE
       The function field_userptr returns NULL on error. The function set_field_userptr returns one of the following:

       E_OK The routine succeeded.

       E_SYSTEM_ERROR
	    System error occurred (see errno).

SEE ALSO
       curses(3X), form(3X).

NOTES
       The header file <form.h> automatically includes the header file <curses.h>.

PORTABILITY
       These routines emulate the System V forms library.  They were not supported on Version 7 or BSD versions.

       The user pointer should be a void pointer.  We leave it as a char pointer for SVr4 compatibility.

AUTHORS
       Juergen Pfeifer.  Manual pages and adaptation for new curses by Eric S. Raymond.

															    form_field_userptr(3X)