| <!-- |
| * t |
| **************************************************************************** |
| * Copyright 2018-2021,2022 Thomas E. Dickey * |
| * Copyright 1998-2010,2017 Free Software Foundation, Inc. * |
| * * |
| * Permission is hereby granted, free of charge, to any person obtaining a * |
| * copy of this software and associated documentation files (the * |
| * "Software"), to deal in the Software without restriction, including * |
| * without limitation the rights to use, copy, modify, merge, publish, * |
| * distribute, distribute with modifications, sublicense, and/or sell * |
| * copies of the Software, and to permit persons to whom the Software is * |
| * furnished to do so, subject to the following conditions: * |
| * * |
| * The above copyright notice and this permission notice shall be included * |
| * in all copies or substantial portions of the Software. * |
| * * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * |
| * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * |
| * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * |
| * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * |
| * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * |
| * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * |
| * * |
| * Except as contained in this notice, the name(s) of the above copyright * |
| * holders shall not be used in advertising or otherwise to promote the * |
| * sale, use or other dealings in this Software without prior written * |
| * authorization. * |
| **************************************************************************** |
| * @Id: form_field_buffer.3x,v 1.30 2022/02/12 20:03:40 tom Exp @ |
| --> |
| <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"> |
| <HTML> |
| <HEAD> |
| <meta http-equiv="Content-Type" content="text/html; charset=us-ascii"> |
| <meta name="generator" content="Manpage converted by man2html - see https://invisible-island.net/scripts/readme.html#others_scripts"> |
| <TITLE>form_field_buffer 3x</TITLE> |
| <link rel="author" href="mailto:bug-ncurses@gnu.org"> |
| |
| </HEAD> |
| <BODY> |
| <H1 class="no-header">form_field_buffer 3x</H1> |
| <PRE> |
| <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> |
| |
| |
| |
| |
| </PRE><H2><a name="h2-NAME">NAME</a></H2><PRE> |
| <STRONG>form_field_buffer</STRONG> - field buffer control |
| |
| |
| </PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE> |
| <STRONG>#include</STRONG> <STRONG><form.h></STRONG> |
| |
| <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> |
| <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> |
| |
| <STRONG>int</STRONG> <STRONG>set_field_status(FIELD</STRONG> <STRONG>*</STRONG><EM>field</EM><STRONG>,</STRONG> <STRONG>bool</STRONG> <EM>status</EM><STRONG>);</STRONG> |
| <STRONG>bool</STRONG> <STRONG>field_status(const</STRONG> <STRONG>FIELD</STRONG> <STRONG>*</STRONG><EM>field</EM><STRONG>);</STRONG> |
| |
| <STRONG>int</STRONG> <STRONG>set_max_field(FIELD</STRONG> <STRONG>*</STRONG><EM>field</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>max</EM><STRONG>);</STRONG> |
| |
| |
| </PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE> |
| The function <STRONG>set_field_buffer</STRONG> sets the numbered buffer of the given |
| field to contain a given string: |
| |
| <STRONG>o</STRONG> Buffer 0 is the displayed value of the field. |
| |
| <STRONG>o</STRONG> Other numbered buffers may be allocated by applications through |
| the <STRONG>nbuf</STRONG> argument of (see <STRONG><A HREF="form_field_new.3x.html">form_field_new(3x)</A></STRONG>) but are not |
| manipulated by the forms library. |
| |
| The function <STRONG>field_buffer</STRONG> returns a pointer to the contents of the |
| given numbered buffer: |
| |
| <STRONG>o</STRONG> The buffer contents always have the same length, and are padded |
| with trailing spaces as needed to ensure this length is the |
| same. |
| |
| <STRONG>o</STRONG> The buffer may contain leading spaces, depending on how it was |
| set. |
| |
| <STRONG>o</STRONG> The buffer contents are set with <STRONG>set_field_buffer</STRONG>, or as a side |
| effect of any editing operations on the corresponding field. |
| |
| <STRONG>o</STRONG> Editing operations are based on the <EM>window</EM> which displays the |
| field, rather than a <EM>string</EM>. The window contains only printable |
| characters, and is filled with blanks. If you want the raw |
| data, you must write your own routine that copies the value out |
| of the buffer and removes the leading and trailing spaces. |
| |
| <STRONG>o</STRONG> Because editing operations change the content of the buffer to |
| correspond to the window, you should not rely on using buffers |
| for long-term storage of form data. |
| |
| The function <STRONG>set_field_status</STRONG> sets the associated status flag of <EM>field</EM>; |
| <STRONG>field_status</STRONG> gets the current value. The status flag is set to a |
| nonzero value whenever the field changes. |
| |
| The function <STRONG>set_max_field</STRONG> sets the maximum size for a dynamic field. |
| An argument of 0 turns off any maximum size threshold for that field. |
| |
| |
| </PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE> |
| The <STRONG>field_buffer</STRONG> function returns NULL on error. It sets <STRONG>errno</STRONG> |
| according to their success: |
| |
| <STRONG>E_OK</STRONG> The routine succeeded. |
| |
| <STRONG>E_BAD_ARGUMENT</STRONG> |
| Routine detected an incorrect or out-of-range argument. |
| |
| The <STRONG>field_status</STRONG> function returns <STRONG>TRUE</STRONG> or <STRONG>FALSE</STRONG>. |
| |
| The remaining routines return one of the following: |
| |
| <STRONG>E_OK</STRONG> The routine succeeded. |
| |
| <STRONG>E_SYSTEM_ERROR</STRONG> |
| System error occurred (see <STRONG>errno(3)</STRONG>). |
| |
| <STRONG>E_BAD_ARGUMENT</STRONG> |
| Routine detected an incorrect or out-of-range argument. |
| |
| |
| </PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE> |
| <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG> and related pages whose names begin "form_" for detailed |
| descriptions of the entry points. |
| |
| |
| </PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE> |
| The header file <STRONG><form.h></STRONG> automatically includes the header file |
| |
| When configured for wide characters, <STRONG>field_buffer</STRONG> returns a pointer to |
| temporary storage (allocated and freed by the library). The |
| application should not attempt to modify the data. It will be freed on |
| the next call to <STRONG>field_buffer</STRONG> to return the same buffer. <STRONG><curses.h></STRONG>. |
| |
| |
| </PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE> |
| These routines emulate the System V forms library. They were not |
| supported on Version 7 or BSD versions. |
| |
| The <STRONG>set_max_field</STRONG> function checks for an ncurses extension |
| <STRONG>O_INPUT_FIELD</STRONG> which allows a dynamic field to shrink if the new limit |
| is smaller than the current field size. |
| |
| |
| </PRE><H2><a name="h2-AUTHORS">AUTHORS</a></H2><PRE> |
| Juergen Pfeifer. Manual pages and adaptation for new curses by Eric S. |
| Raymond. |
| |
| |
| |
| <STRONG><A HREF="form_field_buffer.3x.html">form_field_buffer(3x)</A></STRONG> |
| </PRE> |
| <div class="nav"> |
| <ul> |
| <li><a href="#h2-NAME">NAME</a></li> |
| <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li> |
| <li><a href="#h2-DESCRIPTION">DESCRIPTION</a></li> |
| <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li> |
| <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li> |
| <li><a href="#h2-NOTES">NOTES</a></li> |
| <li><a href="#h2-PORTABILITY">PORTABILITY</a></li> |
| <li><a href="#h2-AUTHORS">AUTHORS</a></li> |
| </ul> |
| </div> |
| </BODY> |
| </HTML> |