|E_OK||The routine succeeded.|
|Routine detected an incorrect or out-of-range argument.|
|Routine was called from an initialization or termination function.|
|Contents of a field are not valid.|
|The form driver could not process the request.|
|System error occurred (see errno).|
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.
Juergen Pfeifer. Manual pages and adaptation for new curses by Eric S. Raymond.