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31 * @Id: form_field_buffer.3x,v 1.27 2020/10/24 09:27:17 tom Exp @
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43 <H1 class="no-header">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>
50 </PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
51 <STRONG>form_field_buffer</STRONG> - field buffer control
54 </PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
55 <STRONG>#include</STRONG> <STRONG><form.h></STRONG>
57 <STRONG>int</STRONG> <STRONG>set_field_buffer(FIELD</STRONG> <STRONG>*</STRONG><EM>field</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>buf</EM><STRONG>,</STRONG> <STRONG>const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>value</EM><STRONG>);</STRONG>
58 <STRONG>char</STRONG> <STRONG>*field_buffer(const</STRONG> <STRONG>FIELD</STRONG> <STRONG>*</STRONG><EM>field</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>buffer</EM><STRONG>);</STRONG>
60 <STRONG>int</STRONG> <STRONG>set_field_status(FIELD</STRONG> <STRONG>*</STRONG><EM>field</EM><STRONG>,</STRONG> <STRONG>bool</STRONG> <EM>status</EM><STRONG>);</STRONG>
61 <STRONG>bool</STRONG> <STRONG>field_status(const</STRONG> <STRONG>FIELD</STRONG> <STRONG>*</STRONG><EM>field</EM><STRONG>);</STRONG>
63 <STRONG>int</STRONG> <STRONG>set_max_field(FIELD</STRONG> <STRONG>*</STRONG><EM>field</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>max</EM><STRONG>);</STRONG>
66 </PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
67 The function <STRONG>set_field_buffer</STRONG> sets the numbered buffer of the given
68 field to contain a given string:
70 <STRONG>o</STRONG> Buffer 0 is the displayed value of the field.
72 <STRONG>o</STRONG> Other numbered buffers may be allocated by applications through
73 the <STRONG>nbuf</STRONG> argument of (see <STRONG><A HREF="form_field_new.3x.html">form_field_new(3x)</A></STRONG>) but are not
74 manipulated by the forms library.
76 The function <STRONG>field_buffer</STRONG> returns a pointer to the contents of the
77 given numbered buffer:
79 <STRONG>o</STRONG> The buffer contents always have the same length, and are padded
80 with trailing spaces as needed to ensure this length is the
83 <STRONG>o</STRONG> The buffer may contain leading spaces, depending on how it was
86 <STRONG>o</STRONG> The buffer contents are set with <STRONG>set_field_buffer</STRONG>, or as a side
87 effect of any editing operations on the corresponding field.
89 <STRONG>o</STRONG> Editing operations are based on the <EM>window</EM> which displays the
90 field, rather than a <EM>string</EM>. The window contains only printable
91 characters, and is filled with blanks. If you want the raw
92 data, you must write your own routine that copies the value out
93 of the buffer and removes the leading and trailing spaces.
95 <STRONG>o</STRONG> Because editing operations change the content of the buffer to
96 correspond to the window, you should not rely on using buffers
97 for long-term storage of form data.
99 The function <STRONG>set_field_status</STRONG> sets the associated status flag of <EM>field</EM>;
100 <STRONG>field_status</STRONG> gets the current value. The status flag is set to a
101 nonzero value whenever the field changes.
103 The function <STRONG>set_max_field</STRONG> sets the maximum size for a dynamic field.
104 An argument of 0 turns off any maximum size threshold for that field.
107 </PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
108 The <STRONG>field_buffer</STRONG> function returns NULL on error. It sets <STRONG>errno</STRONG>
109 according to their success:
111 <STRONG>E_OK</STRONG> The routine succeeded.
113 <STRONG>E_BAD_ARGUMENT</STRONG>
114 Routine detected an incorrect or out-of-range argument.
116 The <STRONG>field_status</STRONG> function returns <STRONG>TRUE</STRONG> or <STRONG>FALSE</STRONG>.
118 The remaining routines return one of the following:
120 <STRONG>E_OK</STRONG> The routine succeeded.
122 <STRONG>E_SYSTEM_ERROR</STRONG>
123 System error occurred (see <STRONG>errno(3)</STRONG>).
125 <STRONG>E_BAD_ARGUMENT</STRONG>
126 Routine detected an incorrect or out-of-range argument.
129 </PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
130 <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG> and related pages whose names begin "form_" for detailed
131 descriptions of the entry points.
134 </PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
135 The header file <STRONG><form.h></STRONG> automatically includes the header file
137 When configured for wide characters, <STRONG>field_buffer</STRONG> returns a pointer to
138 temporary storage (allocated and freed by the library). The
139 application should not attempt to modify the data. It will be freed on
140 the next call to <STRONG>field_buffer</STRONG> to return the same buffer. <STRONG><curses.h></STRONG>.
143 </PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
144 These routines emulate the System V forms library. They were not
145 supported on Version 7 or BSD versions.
147 The <STRONG>set_max_field</STRONG> function checks for an ncurses extension
148 <STRONG>O_INPUT_FIELD</STRONG> which allows a dynamic field to shrink if the new limit
149 is smaller than the current field size.
152 </PRE><H2><a name="h2-AUTHORS">AUTHORS</a></H2><PRE>
153 Juergen Pfeifer. Manual pages and adaptation for new curses by Eric S.
158 <STRONG><A HREF="form_field_buffer.3x.html">form_field_buffer(3x)</A></STRONG>
162 <li><a href="#h2-NAME">NAME</a></li>
163 <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
164 <li><a href="#h2-DESCRIPTION">DESCRIPTION</a></li>
165 <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
166 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
167 <li><a href="#h2-NOTES">NOTES</a></li>
168 <li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
169 <li><a href="#h2-AUTHORS">AUTHORS</a></li>