Provided by: ncurses-doc_6.1+20190803-1ubuntu1_all
form_fieldtype - define validation-field types
#include <form.h> FIELDTYPE *new_fieldtype( bool (* const field_check)(FIELD *, const void *), bool (* const char_check)(int, const void *)); int free_fieldtype(FIELDTYPE *fieldtype); int set_fieldtype_arg( FIELDTYPE *fieldtype, void *(* const make_arg)(va_list *), void *(* const copy_arg)(const void *), void (* const free_arg)(void *)); int set_fieldtype_choice( FIELDTYPE *fieldtype, bool (* const next_choice)(FIELD *, const void *), bool (* const prev_choice)(FIELD *, const void *)); FIELDTYPE *link_fieldtype(FIELDTYPE *type1, FIELDTYPE *type2);
The function new_fieldtype creates a new field type usable for data validation. You supply it with field_check, a predicate to check the validity of an entered data string whenever the user attempts to leave a field. The (FIELD *) argument is passed in so the validation predicate can see the field's buffer, sizes and other attributes; the second argument is an argument-block structure, about which more below. You also supply new_fieldtype with char_check, a function to validate input characters as they are entered; it will be passed the character to be checked and a pointer to an argument-block structure. The function free_fieldtype frees the space allocated for a given validation type. The function set_fieldtype_arg associates three storage-management functions with a field type. The make_arg function is automatically applied to the list of arguments you give set_field_type when attaching validation to a field; its job is to bundle these into an allocated argument-block object which can later be passed to validation predicated. The other two hook arguments should copy and free argument-block structures. They will be used by the forms-driver code. You must supply the make_arg function, the other two are optional, you may supply NULL for them. In this case it is assumed that make_arg does not allocate memory but simply loads the argument into a single scalar value. The function link_fieldtype creates a new field type from the two given types. They are connected by an logical 'OR'. The form driver requests REQ_NEXT_CHOICE and REQ_PREV_CHOICE assume that the possible values of a field form an ordered set, and provide the forms user with a way to move through the set. The set_fieldtype_choice function allows forms programmers to define successor and predecessor functions for the field type. These functions take the field pointer and an argument-block structure as arguments.
The pointer-valued routines return NULL on error. They set errno according to their success: E_OK The routine succeeded. E_BAD_ARGUMENT Routine detected an incorrect or out-of-range argument. E_SYSTEM_ERROR System error occurred, e.g., malloc failure. The integer-valued routines return one of the following codes on error: E_OK The routine succeeded. E_BAD_ARGUMENT Routine detected an incorrect or out-of-range argument. E_CONNECTED The field is already connected to a form. E_CURRENT The field is the current field. E_SYSTEM_ERROR System error occurred (see errno(3)).
The header file <form.h> automatically includes the header file <curses.h>. All of the (char *) arguments of these functions should actually be (void *). The type has been left uncorrected for strict compatibility with System V.
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. fieldtype(3FORM)