The function set_field_opts sets all the given field's option bits
(field option bits may be logically-OR'ed together).
The function field_opts_on turns on the given option bits, and leaves
The function field_opts_off turns off the given option bits, and
leaves others alone.
The function field_opts returns the field's current option bits.
The following standard options are defined (all are on by default):
The field is visited during processing. If this option is off,
the field will not be reachable by navigation keys. Please
notice that an invisible field appears to be inactive also.
Skip to the next field when this one fills.
The field is cleared whenever a character is entered at the
The field can be edited.
Allow a blank field.
Validate field only if modified by user.
The field contents are displayed as data is entered.
Field buffers are fixed to field's original size. Turn this
option off to create a dynamic field.
The field is displayed. If this option is off, display of the
field is suppressed.
Words that do not fit on a line are wrapped to the next line.
Words are blank-separated.
These extension options are defined (extensions are off by default):
Permit dynamic fields to be justified, like static fields.
Preserve leading whitespace in the field buffer, which is
Except for field_opts, each routine returns one of the following:
E_OK The routine succeeded.
Routine detected an incorrect or out-of-range argument.
The field is the current field.
System error occurred (see errno).
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