X-Git-Url: https://ncurses.scripts.mit.edu/?p=ncurses.git;a=blobdiff_plain;f=man%2Fform_fieldtype.3x;h=ee5f909d763f576dd557a83d459b0c46cba92ec1;hp=d93ba281a1c89128916f828100526d5def3c04a6;hb=95b3f94ec8b2da797e3e9a18fb49320daa5ab221;hpb=c633e5103a29a38532cf1925257b91cea33fd090 diff --git a/man/form_fieldtype.3x b/man/form_fieldtype.3x index d93ba281..ee5f909d 100644 --- a/man/form_fieldtype.3x +++ b/man/form_fieldtype.3x @@ -1,6 +1,7 @@ '\" t .\"*************************************************************************** -.\" Copyright (c) 1998,2000 Free Software Foundation, Inc. * +.\" Copyright 2018-2020,2021 Thomas E. Dickey * +.\" Copyright 1998-2006,2010 Free Software Foundation, Inc. * .\" * .\" Permission is hereby granted, free of charge, to any person obtaining a * .\" copy of this software and associated documentation files (the * @@ -27,100 +28,143 @@ .\" authorization. * .\"*************************************************************************** .\" -.\" $Id: form_fieldtype.3x,v 1.8 2000/07/15 22:02:03 tom Exp $ +.\" $Id: form_fieldtype.3x,v 1.30 2021/12/25 21:49:32 tom Exp $ +.de bP +.ie n .IP \(bu 4 +.el .IP \(bu 2 +.. .TH form_fieldtype 3X "" .SH NAME -\fBform_fieldtype\fR - define validation-field types +\fBform_fieldtype\fP \- define validation-field types .SH SYNOPSIS -\fB#include \fR +\fB#include \fP +.sp +\fBFIELDTYPE *new_fieldtype(\fP + \fBbool (* const \fP\fIfield_check\fP\fB)(FIELD *, const void *),\fP + \fBbool (* const \fP\fIchar_check\fP\fB)(int, const void *));\fP .br -FIELDTYPE *new_fieldtype( - bool (* const field_check)(FIELD *, const void *), - bool (* const char_check)(int, const void *)); -.br -int free_fieldtype(FIELDTYPE *fieldtype); -.br -int set_fieldtype_arg( - FIELDTYPE *fieldtype, - void *(* const make_arg)(va_list *), - void *(* const copy_arg)(const void *), - void (* const free_arg)(void *)); -.br -int set_fieldtype_choice( - FIELDTYPE *fieldtype - bool (* const next_choice)(FIELD *, const void *), - bool (* const prev_choice)(FIELD *, const void *)); -.br -FIELDTYPE *link_fieldtype(FIELDTYPE *type1, - FIELDTYPE *type2); +\fBint free_fieldtype(FIELDTYPE *\fP\fIfieldtype\fP\fB);\fP +.sp +\fBint set_fieldtype_arg(\fP + \fBFIELDTYPE *\fP\fIfieldtype\fP\fB,\fP + \fBvoid *(* const \fP\fImake_arg\fP\fB)(va_list *),\fP + \fBvoid *(* const \fP\fIcopy_arg\fP\fB)(const void *),\fP + \fBvoid (* const \fP\fIfree_arg\fP\fB)(void *));\fP .br +\fBint set_fieldtype_choice(\fP + \fBFIELDTYPE *\fP\fIfieldtype\fP\fB,\fP + \fBbool (* const \fP\fInext_choice\fP\fB)(FIELD *, const void *),\fP + \fBbool (* const \fP\fIprev_choice\fP\fB)(FIELD *, const void *));\fP +.sp +\fBFIELDTYPE *link_fieldtype(FIELDTYPE *\fP\fItype1\fP\fB,\fP + \fBFIELDTYPE *\fP\fItype2\fP\fB);\fP .SH DESCRIPTION -The function \fBnew_fieldtype\fR creates a new field type usable for data -validation. You supply it with \fIfield_check\fR, a predicate to check the -validity of an entered data string whenever the user attempt to leave a field. +.SS new_fieldtype +The function \fBnew_fieldtype\fP creates a new field type usable for data +validation. +Its parameters are function pointers: +.TP 5 +\fIfield_check\fP +This function checks the +validity of an entered data string whenever the user attempts to leave a field. +It has two arguments: +.RS +.bP 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 +field's buffer, sizes and other attributes. +.bP +The second argument is an argument-block structure, about which more below. - -You also supply \fBnew_fieldtype\fR with \fIchar_check\fR, -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 \fBfree_fieldtype\fR frees the space allocated for a given -validation type. - -The function \fBset_fieldtype\fR associates three storage-management functions -with a field type. The \fImak_arg\fR function is automatically applied to the -list of arguments you give \fBset_field_type\fR 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 \fImak_arg\fR function, -the other two are optional, you may supply NULL for them. In this case it -is assumed, that \fImak_arg\fR doesn't allocate memory but simply loads the +.RE +.TP 5 +\fIchar_check\fP +This function validates input characters as they are entered. +The form library passes it the character to be checked +and a pointer to an argument-block structure. +.SS free_fieldtype +.PP +The \fBfree_fieldtype\fP function +frees the space allocated for a given validation type by \fBnew_fieldtype\fP. +.SS set_fieldtype_arg +.PP +The function \fBset_fieldtype_arg\fP associates +three storage-management functions with a field type: +.TP 5 +\fImake_arg\fP +This function is automatically applied to the +list of arguments you give \fBset_field_type\fP when attaching validation +to a field. +It stores the arguments in an allocated argument-block +object which is used when validating input. +.TP 5 +\fIcopy_arg\fP +This function may be used by applications to copy argument-blocks. +.TP 5 +\fIfree_arg\fP +Frees an argument-block structure. +.PP +You must supply the \fImake_arg\fP function. +The other two are optional: you may supply NULL for them. +In this case, the form library assumes +that \fImake_arg\fP does not allocate memory but simply loads the argument into a single scalar value. - -The form driver requests \fBREQ_NEXT_CHOICE\fR and \fBREQ_PREV_CHOICE\fR assume +.SS set_fieldtype_choice +.PP +The form driver requests \fBREQ_NEXT_CHOICE\fP and \fBREQ_PREV_CHOICE\fP 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 \fBset_fieldtype_choice\fR +user with a way to move through the set. +.PP +The \fBset_fieldtype_choice\fP function allows forms programmers to define successor and predecessor functions -for the field type. These functions take the field pointer and an +for the field type. +These functions take the field pointer and an argument-block structure as arguments. +.SS link_fieldtype +.PP +The function \fBlink_fieldtype\fP creates +a new field type from the two given types. +They are connected by an logical 'OR'. .SH RETURN VALUE The pointer-valued routines return NULL on error. - +They set \fBerrno\fP according to their success: +.TP 5 +.B E_OK +The routine succeeded. +.TP 5 +.B E_BAD_ARGUMENT +Routine detected an incorrect or out-of-range argument. +.TP 5 +.B E_SYSTEM_ERROR +System error occurred, e.g., malloc failure. +.PP The integer-valued routines return one of the following codes on error: .TP 5 -\fBE_OK\fR +.B E_OK The routine succeeded. .TP 5 -\fBE_SYSTEM_ERROR\fR -System error occurred (see \fBerrno\fR). -.TP 5 -\fBE_BAD_ARGUMENT\fR +.B E_BAD_ARGUMENT Routine detected an incorrect or out-of-range argument. .TP 5 -\fBE_CONNECTED\fR +.B E_CONNECTED The field is already connected to a form. +.TP 5 +.B E_CURRENT +The field is the current field. +.TP 5 +.B E_SYSTEM_ERROR +System error occurred (see \fBerrno\fP(3)). .SH SEE ALSO -\fBcurses\fR(3X), \fBform\fR(3X). +\fBcurses\fP(3X), +\fBform\fP(3X), +\fBform_field_validation\fP(3X). .SH NOTES -The header file \fB\fR automatically includes the header file -\fB\fR. - -All of the \fB(char *)\fR arguments of these functions should actually be -\fB(void *)\fR. The type has been left uncorrected for strict compatibility -with System V. +The header file \fB\fP automatically includes the header file +\fB\fP. .SH PORTABILITY -These routines emulate the System V forms library. They were not supported on +These routines emulate the System V forms library. +They were not supported on Version 7 or BSD versions. .SH AUTHORS -Juergen Pfeifer. Manual pages and adaptation for new curses by Eric -S. Raymond. -.\"# -.\"# The following sets edit modes for GNU EMACS -.\"# Local Variables: -.\"# mode:nroff -.\"# fill-column:79 -.\"# End: +Juergen Pfeifer. +Manual pages and adaptation for new curses by Eric S. Raymond.