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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 attempt 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 associates three storage-man- agement functions with a field type. The mak_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 argu- ment-block structures. They will be used by the forms- driver code. 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 func- take the field pointer and an argument-block structure as arguments.
The pointer-valued routines return NULL on error. The integer-valued routines return one of the following codes on error: E_OK The routine succeeded. E_SYSTEM_ERROR System error occurred (see errno). E_BAD_ARGUMENT Routine detected an incorrect or out-of-range argu- ment. E_CONNECTED The field is already connected to a form.
curses(3X), form(3X).
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.E 2 I 1 E 1