form_userptr - associate application data with a form item
int set_form_userptr(FORM *form, void *userptr);
void* form_userptr(const FORM *form);
Every form and every form item has a field that can be
used to hold application-specific data (that is, the formdriver
code leaves it alone). These functions get and set
the form user pointer field.
The function form_userptr returns NULL on error. The
function set_form_userptr returns one of the following:
E_OK The routine succeeded.
E_SYSTEM_ERROR [Toc] [Back]
System error occurred (see errno).
The header file <form.h> automatically includes the header
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.
Juergen Pfeifer. Manual pages and adaptation for new
curses by Eric S. Raymond.
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