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30 * @Id: form_field_buffer.3x,v 1.19 2010/12/04 18:38:55 tom Exp @
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42 <H1>form_field_buffer 3x</H1>
45 <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 <H2><a name="h2-NAME">NAME</a></H2><PRE>
52 <STRONG>form_field_buffer</STRONG> - field buffer control
56 <H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
57 <STRONG>#include</STRONG> <STRONG><form.h></STRONG>
59 int set_field_buffer(FIELD *field, int buf, const char
61 char *field_buffer(const FIELD *field, int buffer);
62 int set_field_status(FIELD *field, bool status);
63 bool field_status(const FIELD *field);
64 int set_max_field(FIELD *field, int max);
68 <H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
69 The function <STRONG>set_field_buffer</STRONG> sets the numbered buffer of
70 the given field to contain a given string:
72 <STRONG>o</STRONG> Buffer 0 is the displayed value of the field.
74 <STRONG>o</STRONG> Other numbered buffers may be allocated by applica-
75 tions through the <STRONG>nbuf</STRONG> argument of (see
76 <STRONG><A HREF="form_field_new.3x.html">form_field_new(3x)</A></STRONG>) but are not manipulated by the
79 The function <STRONG>field_buffer</STRONG> returns a pointer to the con-
80 tents of the given numbered buffer:
82 <STRONG>o</STRONG> The buffer contents always have the same length,
83 and are padded with trailing spaces as needed to
84 ensure this length is the same.
86 <STRONG>o</STRONG> The buffer may contain leading spaces, depending on
89 <STRONG>o</STRONG> The buffer contents are set with <STRONG>set_field_buffer</STRONG>,
90 or as a side effect of any editing operations on
91 the corresponding field.
93 <STRONG>o</STRONG> Editing operations are based on the <EM>window</EM> which
94 displays the field, rather than a <EM>string</EM>. The win-
95 dow contains only printable characters, and is
96 filled with blanks. If you want the raw data, you
97 must write your own routine that copies the value
98 out of the buffer and removes the leading and
101 <STRONG>o</STRONG> Because editing operations change the content of
102 the buffer to correspond to the window, you should
103 not rely on using buffers for long-term storage of
106 The function <STRONG>set_field_status</STRONG> sets the associated status
107 flag of <EM>field</EM>; <STRONG>field_status</STRONG> gets the current value. The
108 status flag is set to a nonzero value whenever the field
111 The function <STRONG>set_max_field</STRONG> sets the maximum size for a
112 dynamic field. An argument of 0 turns off any maximum
113 size threshold for that field.
117 <H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
118 The <STRONG>field_buffer</STRONG> function returns NULL on error. It sets
119 errno according to their success:
121 <STRONG>E_OK</STRONG> The routine succeeded.
123 <STRONG>E_BAD_ARGUMENT</STRONG>
124 Routine detected an incorrect or out-of-range argu-
127 The <STRONG>field_status</STRONG> function returns <STRONG>TRUE</STRONG> or <STRONG>FALSE</STRONG>.
129 The remaining routines return one of the following:
131 <STRONG>E_OK</STRONG> The routine succeeded.
133 <STRONG>E_SYSTEM_ERROR</STRONG>
134 System error occurred (see <STRONG>errno</STRONG>).
136 <STRONG>E_BAD_ARGUMENT</STRONG>
137 Routine detected an incorrect or out-of-range argu-
142 <H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
143 <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG> and related pages whose names begin "form_" for
144 detailed descriptions of the entry points.
148 <H2><a name="h2-NOTES">NOTES</a></H2><PRE>
149 The header file <STRONG><form.h></STRONG> automatically includes the header
152 When configured for wide characters, <STRONG>field_buffer</STRONG> returns
153 a pointer to temporary storage (allocated and freed by the
154 library). The application should not attempt to modify
155 the data. It will be freed on the next call to <STRONG>field_buf-</STRONG>
156 <STRONG>fer</STRONG> to return the same buffer. <STRONG><curses.h></STRONG>.
160 <H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
161 These routines emulate the System V forms library. They
162 were not supported on Version 7 or BSD versions.
166 <H2><a name="h2-AUTHORS">AUTHORS</a></H2><PRE>
167 Juergen Pfeifer. Manual pages and adaptation for new
168 curses by Eric S. Raymond.
172 <STRONG><A HREF="form_field_buffer.3x.html">form_field_buffer(3x)</A></STRONG>
176 <li><a href="#h2-NAME">NAME</a></li>
177 <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
178 <li><a href="#h2-DESCRIPTION">DESCRIPTION</a></li>
179 <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
180 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
181 <li><a href="#h2-NOTES">NOTES</a></li>
182 <li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
183 <li><a href="#h2-AUTHORS">AUTHORS</a></li>