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71c0306f08
+ modify initialization check for win32con driver to eliminate need for special case for TERM "unknown", using terminal database if available (prompted by discussion with Roumen Petrov). + for MinGW port, ensure that terminal driver is setup if tgetent() is called (patch by Roumen Petrov). + document tabs "-0" and "-8" options in manpage. + fix Debian "lintian" issues with manpages reported in http://lintian.debian.org/full/csmall@debian.org.html#ncurses
179 lines
7.3 KiB
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179 lines
7.3 KiB
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* @Id: form_field_buffer.3x,v 1.16 2010/07/31 16:09:36 tom Exp @
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<HTML>
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<HEAD>
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<TITLE>form_field_buffer 3x</TITLE>
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<link rev=made href="mailto:bug-ncurses@gnu.org">
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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</HEAD>
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<BODY>
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<H1>form_field_buffer 3x</H1>
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<HR>
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<PRE>
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<!-- Manpage converted by man2html 3.0.1 -->
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<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>
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</PRE>
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<H2>NAME</H2><PRE>
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<STRONG>form_field_buffer</STRONG> - field buffer control
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</PRE>
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<H2>SYNOPSIS</H2><PRE>
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<STRONG>#include</STRONG> <STRONG><form.h></STRONG>
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int set_field_buffer(FIELD *field, int buf, const char
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*value);
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char *field_buffer(const FIELD *field, int buffer);
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int set_field_status(FIELD *field, bool status);
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bool field_status(const FIELD *field);
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int set_max_field(FIELD *field, int max);
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</PRE>
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<H2>DESCRIPTION</H2><PRE>
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The function <STRONG>set_field_buffer</STRONG> sets the numbered buffer of
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the given field to contain a given string:
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- Buffer 0 is the displayed value of the field.
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- Other numbered buffers may be allocated by applica-
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tions through the <STRONG>nbuf</STRONG> argument of (see
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<STRONG><A HREF="form_field_new.3x.html">form_field_new(3x)</A></STRONG>) but are not manipulated by the
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forms library.
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The function <STRONG>field_buffer</STRONG> returns a pointer to the con-
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tents of the given numbered buffer:
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- The buffer contents always have the same length, and
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are padded with trailing spaces as needed to ensure
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this length is the same.
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- The buffer may contain leading spaces, depending on
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how it was set.
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- The buffer contents are set with <STRONG>set_field_buffer</STRONG>,
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or as a side effect of any editing operations on the
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corresponding field.
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- Editing operations are based on the <EM>window</EM> which
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displays the field, rather than a <EM>string</EM>. The win-
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dow contains only printable characters, and is
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filled with blanks. If you want the raw data, you
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must write your own routine that copies the value
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out of the buffer and removes the leading and trail-
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ing spaces.
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- Because editing operations change the content of the
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buffer to correspond to the window, you should not
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rely on using buffers for long-term storage of form
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data.
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The function <STRONG>set_field_status</STRONG> sets the associated status
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flag of <EM>field</EM>; <STRONG>field_status</STRONG> gets the current value. The
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status flag is set to a nonzero value whenever the field
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changes.
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The function <STRONG>set_max_field</STRONG> sets the maximum size for a
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dynamic field. An argument of 0 turns off any maximum
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size threshold for that field.
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</PRE>
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<H2>RETURN VALUE</H2><PRE>
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The <STRONG>field_buffer</STRONG> function returns NULL on error. It sets
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errno according to their success:
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<STRONG>E_OK</STRONG> The routine succeeded.
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<STRONG>E_BAD_ARGUMENT</STRONG>
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Routine detected an incorrect or out-of-range argu-
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ment.
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The <STRONG>field_status</STRONG> function returns <STRONG>TRUE</STRONG> or <STRONG>FALSE</STRONG>.
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The remaining routines return one of the following:
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<STRONG>E_OK</STRONG> The routine succeeded.
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<STRONG>E_SYSTEM_ERROR</STRONG>
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System error occurred (see <STRONG>errno</STRONG>).
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<STRONG>E_BAD_ARGUMENT</STRONG>
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Routine detected an incorrect or out-of-range argu-
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ment.
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</PRE>
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<H2>SEE ALSO</H2><PRE>
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<STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG> and related pages whose names begin "form_" for
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detailed descriptions of the entry points.
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</PRE>
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<H2>NOTES</H2><PRE>
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The header file <STRONG><form.h></STRONG> automatically includes the header
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file
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When configured for wide-characters, <STRONG>field_buffer</STRONG> returns
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a pointer to temporary storage (allocated and freed by the
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library). The application should not attempt to modify
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the data. It will be freed on the next call to <STRONG>field_buf-</STRONG>
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<STRONG>fer</STRONG> to return the same buffer. <STRONG><curses.h></STRONG>.
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</PRE>
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<H2>PORTABILITY</H2><PRE>
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These routines emulate the System V forms library. They
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were not supported on Version 7 or BSD versions.
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</PRE>
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<H2>AUTHORS</H2><PRE>
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Juergen Pfeifer. Manual pages and adaptation for new
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curses by Eric S. Raymond.
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<STRONG><A HREF="form_field_buffer.3x.html">form_field_buffer(3x)</A></STRONG>
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</PRE>
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<HR>
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<ADDRESS>
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Man(1) output converted with
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<a href="http://www.oac.uci.edu/indiv/ehood/man2html.html">man2html</a>
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</ADDRESS>
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