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31 * @Id: form_field_buffer.3x,v 1.19 2010/12/04 18:38:55 tom Exp @
35 <TITLE>form_field_buffer 3x</TITLE>
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40 <H1>form_field_buffer 3x</H1>
43 <!-- Manpage converted by man2html 3.0.1 -->
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>
51 <STRONG>form_field_buffer</STRONG> - field buffer control
55 <H2>SYNOPSIS</H2><PRE>
56 <STRONG>#include</STRONG> <STRONG><form.h></STRONG>
58 int set_field_buffer(FIELD *field, int buf, const char
60 char *field_buffer(const FIELD *field, int buffer);
61 int set_field_status(FIELD *field, bool status);
62 bool field_status(const FIELD *field);
63 int set_max_field(FIELD *field, int max);
67 <H2>DESCRIPTION</H2><PRE>
68 The function <STRONG>set_field_buffer</STRONG> sets the numbered buffer of
69 the given field to contain a given string:
71 <STRONG>o</STRONG> Buffer 0 is the displayed value of the field.
73 <STRONG>o</STRONG> Other numbered buffers may be allocated by applica-
74 tions through the <STRONG>nbuf</STRONG> argument of (see
75 <STRONG><A HREF="form_field_new.3x.html">form_field_new(3x)</A></STRONG>) but are not manipulated by the
78 The function <STRONG>field_buffer</STRONG> returns a pointer to the con-
79 tents of the given numbered buffer:
81 <STRONG>o</STRONG> The buffer contents always have the same length,
82 and are padded with trailing spaces as needed to
83 ensure this length is the same.
85 <STRONG>o</STRONG> The buffer may contain leading spaces, depending on
88 <STRONG>o</STRONG> The buffer contents are set with <STRONG>set_field_buffer</STRONG>,
89 or as a side effect of any editing operations on
90 the corresponding field.
92 <STRONG>o</STRONG> Editing operations are based on the <EM>window</EM> which
93 displays the field, rather than a <EM>string</EM>. The win-
94 dow contains only printable characters, and is
95 filled with blanks. If you want the raw data, you
96 must write your own routine that copies the value
97 out of the buffer and removes the leading and
100 <STRONG>o</STRONG> Because editing operations change the content of
101 the buffer to correspond to the window, you should
102 not rely on using buffers for long-term storage of
105 The function <STRONG>set_field_status</STRONG> sets the associated status
106 flag of <EM>field</EM>; <STRONG>field_status</STRONG> gets the current value. The
107 status flag is set to a nonzero value whenever the field
110 The function <STRONG>set_max_field</STRONG> sets the maximum size for a
111 dynamic field. An argument of 0 turns off any maximum
112 size threshold for that field.
116 <H2>RETURN VALUE</H2><PRE>
117 The <STRONG>field_buffer</STRONG> function returns NULL on error. It sets
118 errno according to their success:
120 <STRONG>E_OK</STRONG> The routine succeeded.
122 <STRONG>E_BAD_ARGUMENT</STRONG>
123 Routine detected an incorrect or out-of-range argu-
126 The <STRONG>field_status</STRONG> function returns <STRONG>TRUE</STRONG> or <STRONG>FALSE</STRONG>.
128 The remaining routines return one of the following:
130 <STRONG>E_OK</STRONG> The routine succeeded.
132 <STRONG>E_SYSTEM_ERROR</STRONG>
133 System error occurred (see <STRONG>errno</STRONG>).
135 <STRONG>E_BAD_ARGUMENT</STRONG>
136 Routine detected an incorrect or out-of-range argu-
141 <H2>SEE ALSO</H2><PRE>
142 <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG> and related pages whose names begin "form_" for
143 detailed descriptions of the entry points.
148 The header file <STRONG><form.h></STRONG> automatically includes the header
151 When configured for wide characters, <STRONG>field_buffer</STRONG> returns
152 a pointer to temporary storage (allocated and freed by the
153 library). The application should not attempt to modify
154 the data. It will be freed on the next call to <STRONG>field_buf-</STRONG>
155 <STRONG>fer</STRONG> to return the same buffer. <STRONG><curses.h></STRONG>.
159 <H2>PORTABILITY</H2><PRE>
160 These routines emulate the System V forms library. They
161 were not supported on Version 7 or BSD versions.
165 <H2>AUTHORS</H2><PRE>
166 Juergen Pfeifer. Manual pages and adaptation for new
167 curses by Eric S. Raymond.
171 <STRONG><A HREF="form_field_buffer.3x.html">form_field_buffer(3x)</A></STRONG>
175 Man(1) output converted with
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