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31 * @Id: form_hook.3x,v 1.16 2020/10/18 00:06:29 tom Exp @
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43 <H1 class="no-header">form_hook 3X</H1>
45 <B><A HREF="form_hook.3X.html">form_hook(3X)</A></B> <B><A HREF="form_hook.3X.html">form_hook(3X)</A></B>
50 </PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
51 <B>form_hook</B> - set hooks for automatic invocation by applications
54 </PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
55 <B>#include</B> <B><form.h></B>
57 <B>int</B> <B>set_field_init(FORM</B> <B>*</B><I>form</I><B>,</B> <B>Form_Hook</B> <I>func</I><B>);</B>
58 <B>Form_Hook</B> <B>field_init(const</B> <B>FORM</B> <B>*</B><I>form</I><B>);</B>
60 <B>int</B> <B>set_field_term(FORM</B> <B>*</B><I>form</I><B>,</B> <B>Form_Hook</B> <I>func</I><B>);</B>
61 <B>Form_Hook</B> <B>field_term(const</B> <B>FORM</B> <B>*</B><I>form</I><B>);</B>
63 <B>int</B> <B>set_form_init(FORM</B> <B>*</B><I>form</I><B>,</B> <B>Form_Hook</B> <I>func</I><B>);</B>
64 <B>Form_Hook</B> <B>form_init(const</B> <B>FORM</B> <B>*</B><I>form</I><B>);</B>
66 <B>int</B> <B>set_form_term(FORM</B> <B>*</B><I>form</I><B>,</B> <B>Form_Hook</B> <I>func</I><B>);</B>
67 <B>Form_Hook</B> <B>form_term(const</B> <B>FORM</B> <B>*</B><I>form</I><B>);</B>
70 </PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
71 These functions make it possible to set hook functions to be called at
72 various points in the automatic processing of input event codes by
75 The function <B>set_field_init</B> sets a hook to be called at form-post time
76 and each time the selected field changes (after the change).
77 <B>field_init</B> returns the current field init hook, if any (<B>NULL</B> if there
80 The function <B>set_field_term</B> sets a hook to be called at form-unpost
81 time and each time the selected field changes (before the change).
82 <B>field_term</B> returns the current field term hook, if any (<B>NULL</B> if there
85 The function <B>set_form_init</B> sets a hook to be called at form-post time
86 and just after a page change once it is posted. <B>form_init</B> returns the
87 current form init hook, if any (<B>NULL</B> if there is no such hook).
89 The function <B>set_form_term</B> sets a hook to be called at form-unpost time
90 and just before a page change once it is posted. <B>form_init</B> returns the
91 current form term hook, if any (<B>NULL</B> if there is no such hook).
94 </PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
95 Routines that return pointers return <B>NULL</B> on error. Other routines
96 return one of the following:
98 <B>E_OK</B> The routine succeeded.
100 <B>E_SYSTEM_ERROR</B>
101 System error occurred (see <B>errno(3)</B>).
104 </PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
105 <B><A HREF="curses.3X.html">curses(3X)</A></B>, <B><A HREF="form.3X.html">form(3X)</A></B>.
108 </PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
109 The header file <B><form.h></B> automatically includes the header file
110 <B><curses.h></B>.
113 </PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
114 These routines emulate the System V forms library. They were not
115 supported on Version 7 or BSD versions.
118 </PRE><H2><a name="h2-AUTHORS">AUTHORS</a></H2><PRE>
119 Juergen Pfeifer. Manual pages and adaptation for new curses by Eric S.
124 <B><A HREF="form_hook.3X.html">form_hook(3X)</A></B>
128 <li><a href="#h2-NAME">NAME</a></li>
129 <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
130 <li><a href="#h2-DESCRIPTION">DESCRIPTION</a></li>
131 <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
132 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
133 <li><a href="#h2-NOTES">NOTES</a></li>
134 <li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
135 <li><a href="#h2-AUTHORS">AUTHORS</a></li>