form_userptr(), set_form_userptr() - associate application data with a form item
int set_form_userptr(FORM *form, char *userptr); char form_userptr(FORM *form);
Every form and every form item 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 the form user pointer field.
The function form_userptr(3) returns NULL on error.
The function set_form_userptr(3) returns one of the following:
The header file <form.h> automatically includes the header file <curses.h>.
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.