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30 * @Id: form_field_buffer.3x,v 1.20 2017/11/18 23:56:00 tom Exp @
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42 <H1 class="no-header">form_field_buffer 3x</H1>
44 <STRONG><A HREF="form_field_buffer.3x.html">form_field_buffer(3x)</A></STRONG> <STRONG><A HREF="form_field_buffer.3x.html">form_field_buffer(3x)</A></STRONG>
49 </PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
50 <STRONG>form_field_buffer</STRONG> - field buffer control
53 </PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
54 <STRONG>#include</STRONG> <STRONG><form.h></STRONG>
56 int set_field_buffer(FIELD *field, int buf, const char *value);
57 char *field_buffer(const FIELD *field, int buffer);
58 int set_field_status(FIELD *field, bool status);
59 bool field_status(const FIELD *field);
60 int set_max_field(FIELD *field, int max);
63 </PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
64 The function <STRONG>set_field_buffer</STRONG> sets the numbered buffer of the given
65 field to contain a given string:
67 <STRONG>o</STRONG> Buffer 0 is the displayed value of the field.
69 <STRONG>o</STRONG> Other numbered buffers may be allocated by applications through
70 the <STRONG>nbuf</STRONG> argument of (see <STRONG><A HREF="form_field_new.3x.html">form_field_new(3x)</A></STRONG>) but are not manip-
71 ulated by the forms library.
73 The function <STRONG>field_buffer</STRONG> returns a pointer to the contents of the
74 given numbered buffer:
76 <STRONG>o</STRONG> The buffer contents always have the same length, and are padded
77 with trailing spaces as needed to ensure this length is the
80 <STRONG>o</STRONG> The buffer may contain leading spaces, depending on how it was
83 <STRONG>o</STRONG> The buffer contents are set with <STRONG>set_field_buffer</STRONG>, or as a side
84 effect of any editing operations on the corresponding field.
86 <STRONG>o</STRONG> Editing operations are based on the <EM>window</EM> which displays the
87 field, rather than a <EM>string</EM>. The window contains only printable
88 characters, and is filled with blanks. If you want the raw
89 data, you must write your own routine that copies the value out
90 of the buffer and removes the leading and trailing spaces.
92 <STRONG>o</STRONG> Because editing operations change the content of the buffer to
93 correspond to the window, you should not rely on using buffers
94 for long-term storage of form data.
96 The function <STRONG>set_field_status</STRONG> sets the associated status flag of <EM>field</EM>;
97 <STRONG>field_status</STRONG> gets the current value. The status flag is set to a
98 nonzero value whenever the field changes.
100 The function <STRONG>set_max_field</STRONG> sets the maximum size for a dynamic field.
101 An argument of 0 turns off any maximum size threshold for that field.
104 </PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
105 The <STRONG>field_buffer</STRONG> function returns NULL on error. It sets errno accord-
106 ing to their success:
108 <STRONG>E_OK</STRONG> The routine succeeded.
110 <STRONG>E_BAD_ARGUMENT</STRONG>
111 Routine detected an incorrect or out-of-range argument.
113 The <STRONG>field_status</STRONG> function returns <STRONG>TRUE</STRONG> or <STRONG>FALSE</STRONG>.
115 The remaining routines return one of the following:
117 <STRONG>E_OK</STRONG> The routine succeeded.
119 <STRONG>E_SYSTEM_ERROR</STRONG>
120 System error occurred (see <STRONG>errno</STRONG>).
122 <STRONG>E_BAD_ARGUMENT</STRONG>
123 Routine detected an incorrect or out-of-range argument.
126 </PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
127 <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG> and related pages whose names begin "form_" for detailed
128 descriptions of the entry points.
131 </PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
132 The header file <STRONG><form.h></STRONG> automatically includes the header file
134 When configured for wide characters, <STRONG>field_buffer</STRONG> returns a pointer to
135 temporary storage (allocated and freed by the library). The applica-
136 tion should not attempt to modify the data. It will be freed on the
137 next call to <STRONG>field_buffer</STRONG> to return the same buffer. <STRONG><curses.h></STRONG>.
140 </PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
141 These routines emulate the System V forms library. They were not sup-
142 ported on Version 7 or BSD versions.
145 </PRE><H2><a name="h2-AUTHORS">AUTHORS</a></H2><PRE>
146 Juergen Pfeifer. Manual pages and adaptation for new curses by Eric S.
151 <STRONG><A HREF="form_field_buffer.3x.html">form_field_buffer(3x)</A></STRONG>
155 <li><a href="#h2-NAME">NAME</a></li>
156 <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
157 <li><a href="#h2-DESCRIPTION">DESCRIPTION</a></li>
158 <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
159 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
160 <li><a href="#h2-NOTES">NOTES</a></li>
161 <li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
162 <li><a href="#h2-AUTHORS">AUTHORS</a></li>