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28 .\"***************************************************************************
30 .\" $Id: form_fieldtype.3x,v 1.7 1998/11/29 01:07:16 Rick.Ohnemus Exp $
33 \fBform_fieldtype\fR - define validation-field types
35 \fB#include <form.h>\fR
37 FIELDTYPE *new_fieldtype(
38 bool (* const field_check)(FIELD *, const void *),
39 bool (* const char_check)(int, const void *));
41 int free_fieldtype(FIELDTYPE *fieldtype);
43 int set_fieldtype_arg(
45 void *(* const make_arg)(va_list *),
46 void *(* const copy_arg)(const void *),
47 void (* const free_arg)(void *));
49 int set_fieldtype_choice(
51 bool (* const next_choice)(FIELD *, const void *),
52 bool (* const prev_choice)(FIELD *, const void *));
54 FIELDTYPE *link_fieldtype(FIELDTYPE *type1,
58 The function \fBnew_fieldtype\fR creates a new field type usable for data
59 validation. You supply it with \fIfield_check\fR, a predicate to check the
60 validity of an entered data string whenever the user attempt to leave a field.
61 The (FIELD *) argument is passed in so the validation predicate can see the
62 field's buffer, sizes and other attributes; the second argument is an
63 argument-block structure, about which more below.
65 You also supply \fBnew_fieldtype\fR with \fIchar_check\fR,
66 a function to validate input characters as they are entered; it will be passed
67 the character to be checked and a pointer to an argument-block structure.
69 The function \fBfree_fieldtype\fR frees the space allocated for a given
72 The function \fBset_fieldtype\fR associates three storage-management functions
73 with a field type. The \fImak_arg\fR function is automatically applied to the
74 list of arguments you give \fBset_field_type\fR when attaching validation
75 to a field; its job is to bundle these into an allocated argument-block
76 object which can later be passed to validation predicated. The other two
77 hook arguments should copy and free argument-block structures. They will
78 be used by the forms-driver code. You must supply the \fImak_arg\fR function,
79 the other two are optional, you may supply NULL for them. In this case it
80 is assumed, that \fImak_arg\fR doesn't allocate memory but simply loads the
81 argument into a single scalar value.
83 The form driver requests \fBREQ_NEXT_CHOICE\fR and \fBREQ_PREV_CHOICE\fR assume
84 that the possible values of a field form an ordered set, and provide the forms
85 user with a way to move through the set. The \fBset_fieldtype_choice\fR
86 function allows forms programmers to define successor and predecessor functions
87 for the field type. These functions take the field pointer and an
88 argument-block structure as arguments.
90 The pointer-valued routines return NULL on error.
92 The integer-valued routines return one of the following codes on
96 The routine succeeded.
99 System error occurred (see \fBerrno\fR).
102 Routine detected an incorrect or out-of-range argument.
105 The field is already connected to a form.
107 \fBcurses\fR(3X), \fBform\fR(3X).
109 The header file \fB<form.h>\fR automatically includes the header file
112 All of the \fB(char *)\fR arguments of these functions should actually be
113 \fB(void *)\fR. The type has been left uncorrected for strict compatibility
116 These routines emulate the System V forms library. They were not supported on
117 Version 7 or BSD versions.
119 Juergen Pfeifer. Manual pages and adaptation for new curses by Eric
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