Synopsis:

       no_chars=db_fwidth(db_handle,field_nr/name)

Arguments:

       db_handle - The database handle

       fieldnr/name - The field number or field name

Description:   This function returns the field width for the given field_nr or field_name,  which is the number of characters required to hold the contents of the field.

Returns:   Returns the field width or a negative error code.