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<H1 class="no-header">curs_termcap 3x</H1>
<PRE>
<STRONG><A HREF="curs_termcap.3x.html">curs_termcap(3x)</A></STRONG> <STRONG><A HREF="curs_termcap.3x.html">curs_termcap(3x)</A></STRONG>
</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
<STRONG>PC</STRONG>, <STRONG>UP</STRONG>, <STRONG>BC</STRONG>, <STRONG>ospeed</STRONG>, <STRONG>tgetent</STRONG>, <STRONG>tgetflag</STRONG>, <STRONG>tgetnum</STRONG>, <STRONG>tgetstr</STRONG>, <STRONG>tgoto</STRONG>, <STRONG>tputs</STRONG> -
direct <STRONG>curses</STRONG> interface to the terminfo capability database
</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
<STRONG>#include</STRONG> <STRONG><term.h></STRONG>
<STRONG>extern</STRONG> <STRONG>char</STRONG> <STRONG>PC;</STRONG>
<STRONG>extern</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG> <STRONG>UP;</STRONG>
<STRONG>extern</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG> <STRONG>BC;</STRONG>
<STRONG>extern</STRONG> <STRONG>short</STRONG> <STRONG>ospeed;</STRONG>
<STRONG>int</STRONG> <STRONG>tgetent(char</STRONG> <STRONG>*bp,</STRONG> <STRONG>const</STRONG> <STRONG>char</STRONG> <STRONG>*name);</STRONG>
<STRONG>int</STRONG> <STRONG>tgetflag(const</STRONG> <STRONG>char</STRONG> <STRONG>*id);</STRONG>
<STRONG>int</STRONG> <STRONG>tgetnum(const</STRONG> <STRONG>char</STRONG> <STRONG>*id);</STRONG>
<STRONG>char</STRONG> <STRONG>*tgetstr(const</STRONG> <STRONG>char</STRONG> <STRONG>*id,</STRONG> <STRONG>char</STRONG> <STRONG>**area);</STRONG>
<STRONG>char</STRONG> <STRONG>*tgoto(const</STRONG> <STRONG>char</STRONG> <STRONG>*cap,</STRONG> <STRONG>int</STRONG> <STRONG>col,</STRONG> <STRONG>int</STRONG> <STRONG>row);</STRONG>
<STRONG>int</STRONG> <STRONG>tputs(const</STRONG> <STRONG>char</STRONG> <STRONG>*str,</STRONG> <STRONG>int</STRONG> <STRONG>affcnt,</STRONG> <STRONG>int</STRONG> <STRONG>(*putc)(int));</STRONG>
</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
These routines are included as a conversion aid for programs that use
the <EM>termcap</EM> library. Their parameters are the same and the routines
are emulated using the <EM>terminfo</EM> database. Thus, they can only be used
to query the capabilities of entries for which a terminfo entry has
been compiled.
</PRE><H3><a name="h3-INITIALIZATION">INITIALIZATION</a></H3><PRE>
The <STRONG>tgetent</STRONG> routine loads the entry for <EM>name</EM>. It returns:
1 on success,
0 if there is no such entry (or that it is a generic type, having
too little information for curses applications to run), and
-1 if the terminfo database could not be found.
This differs from the <EM>termcap</EM> library in two ways:
<STRONG>o</STRONG> The emulation ignores the buffer pointer <EM>bp</EM>. The <EM>termcap</EM> li-
brary would store a copy of the terminal description in the area
referenced by this pointer. However, ncurses stores its termi-
nal descriptions in compiled binary form, which is not the same
thing.
<STRONG>o</STRONG> There is a difference in return codes. The <EM>termcap</EM> library does
not check if the terminal description is marked with the <EM>generic</EM>
capability, or if the terminal description has cursor-address-
ing.
</PRE><H3><a name="h3-CAPABILITY-VALUES">CAPABILITY VALUES</a></H3><PRE>
The <STRONG>tgetflag</STRONG> routine gets the boolean entry for <EM>id</EM>, or zero if it is
not available.
The <STRONG>tgetnum</STRONG> routine gets the numeric entry for <EM>id</EM>, or -1 if it is not
available.
The <STRONG>tgetstr</STRONG> routine returns the string entry for <EM>id</EM>, or zero if it is
not available. Use <STRONG>tputs</STRONG> to output the returned string. The <EM>area</EM> pa-
rameter is used as follows:
<STRONG>o</STRONG> It is assumed to be the address of a pointer to a buffer managed
by the calling application.
<STRONG>o</STRONG> However, ncurses checks to ensure that <STRONG>area</STRONG> is not NULL, and al-
so that the resulting buffer pointer is not NULL. If either
check fails, the <EM>area</EM> parameter is ignored.
<STRONG>o</STRONG> If the checks succeed, ncurses also copies the return value to
the buffer pointed to by <EM>area</EM>, and the <EM>area</EM> value will be updat-
ed to point past the null ending this value.
<STRONG>o</STRONG> The return value itself is an address in the terminal descrip-
tion which is loaded into memory.
Only the first two characters of the <STRONG>id</STRONG> parameter of <STRONG>tgetflag</STRONG>, <STRONG>tgetnum</STRONG>
and <STRONG>tgetstr</STRONG> are compared in lookups.
</PRE><H3><a name="h3-FORMATTING-CAPABILITIES">FORMATTING CAPABILITIES</a></H3><PRE>
The <STRONG>tgoto</STRONG> routine expands the given capability using the parameters.
<STRONG>o</STRONG> Because the capability may have padding characters, the output of
<STRONG>tgoto</STRONG> should be passed to <STRONG>tputs</STRONG> rather than some other output func-
tion such as <STRONG>printf</STRONG>.
<STRONG>o</STRONG> While <STRONG>tgoto</STRONG> is assumed to be used for the two-parameter cursor po-
sitioning capability, termcap applications also use it for single-
parameter capabilities.
Doing this shows a quirk in <STRONG>tgoto</STRONG>: most hardware terminals use cur-
sor addressing with <EM>row</EM> first, but the original developers of the
termcap interface chose to put the <EM>column</EM> parameter first. The
<STRONG>tgoto</STRONG> function swaps the order of parameters. It does this also
for calls requiring only a single parameter. In that case, the
first parameter is merely a placeholder.
<STRONG>o</STRONG> Normally the ncurses library is compiled with terminfo support. In
that case, <STRONG>tgoto</STRONG> uses <STRONG><A HREF="curs_terminfo.3x.html">tparm(3x)</A></STRONG> (a more capable formatter).
However, <STRONG>tparm</STRONG> is not a <EM>termcap</EM> feature, and portable <EM>termcap</EM> ap-
plications should not rely upon its availability.
The <STRONG>tputs</STRONG> routine is described on the <STRONG><A HREF="curs_terminfo.3x.html">curs_terminfo(3x)</A></STRONG> manual page.
It can retrieve capabilities by either termcap or terminfo name.
</PRE><H3><a name="h3-GLOBAL-VARIABLES">GLOBAL VARIABLES</a></H3><PRE>
The variables <STRONG>PC</STRONG>, <STRONG>UP</STRONG> and <STRONG>BC</STRONG> are set by <STRONG>tgetent</STRONG> to the terminfo entry's
data for <STRONG>pad_char</STRONG>, <STRONG>cursor_up</STRONG> and <STRONG>backspace_if_not_bs</STRONG>, respectively. <STRONG>UP</STRONG>
is not used by ncurses. <STRONG>PC</STRONG> is used in the <STRONG>tdelay_output</STRONG> function. <STRONG>BC</STRONG>
is used in the <STRONG>tgoto</STRONG> emulation. The variable <STRONG>ospeed</STRONG> is set by ncurses
in a system-specific coding to reflect the terminal speed.
</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
Except where explicitly noted, routines that return an integer return
<STRONG>ERR</STRONG> upon failure and <STRONG>OK</STRONG> (SVr4 only specifies "an integer value other
than <STRONG>ERR</STRONG>") upon successful completion.
Routines that return pointers return <STRONG>NULL</STRONG> on error.
</PRE><H2><a name="h2-BUGS">BUGS</a></H2><PRE>
If you call <STRONG>tgetstr</STRONG> to fetch <STRONG>ca</STRONG> or any other parameterized string, be
aware that it will be returned in terminfo notation, not the older and
not-quite-compatible termcap notation. This will not cause problems if
all you do with it is call <STRONG>tgoto</STRONG> or <STRONG>tparm</STRONG>, which both expand terminfo-
style strings as terminfo. (The <STRONG>tgoto</STRONG> function, if configured to sup-
port termcap, will check if the string is indeed terminfo-style by
looking for "%p" parameters or "$<..>" delays, and invoke a termcap-
style parser if the string does not appear to be terminfo).
Because terminfo conventions for representing padding in string capa-
bilities differ from termcap's, <STRONG>tputs("50");</STRONG> will put out a literal
"50" rather than busy-waiting for 50 milliseconds. Cope with it.
Note that termcap has nothing analogous to terminfo's <STRONG>sgr</STRONG> string. One
consequence of this is that termcap applications assume me (terminfo
<STRONG>sgr0</STRONG>) does not reset the alternate character set. This implementation
checks for, and modifies the data shown to the termcap interface to ac-
commodate termcap's limitation in this respect.
</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
These functions are provided for supporting legacy applications, and
should not be used in new programs:
<STRONG>o</STRONG> The XSI Curses standard, Issue 4 describes these functions. Howev-
er, they are marked TO BE WITHDRAWN and may be removed in future
versions.
<STRONG>o</STRONG> X/Open Curses, Issue 5 (December 2007) marked the termcap interface
(along with <STRONG>vwprintw</STRONG> and <STRONG>vwscanw</STRONG>) as withdrawn.
Neither the XSI Curses standard nor the SVr4 man pages documented the
return values of <STRONG>tgetent</STRONG> correctly, though all three were in fact re-
turned ever since SVr1. In particular, an omission in the XSI Curses
documentation has been misinterpreted to mean that <STRONG>tgetent</STRONG> returns <STRONG>OK</STRONG>
or <STRONG>ERR</STRONG>. Because the purpose of these functions is to provide compati-
bility with the <EM>termcap</EM> library, that is a defect in XCurses, Issue 4,
Version 2 rather than in ncurses.
External variables are provided for support of certain termcap applica-
tions. However, termcap applications' use of those variables is poorly
documented, e.g., not distinguishing between input and output. In par-
ticular, some applications are reported to declare and/or modify <STRONG>os-</STRONG>
<STRONG>peed</STRONG>.
The comment that only the first two characters of the <STRONG>id</STRONG> parameter are
used escapes many application developers. The original BSD 4.2 termcap
library (and historical relics thereof) did not require a trailing null
NUL on the parameter name passed to <STRONG>tgetstr</STRONG>, <STRONG>tgetnum</STRONG> and <STRONG>tgetflag</STRONG>.
Some applications assume that the termcap interface does not require
the trailing NUL for the parameter name. Taking into account these is-
sues:
<STRONG>o</STRONG> As a special case, <STRONG>tgetflag</STRONG> matched against a single-character
identifier provided that was at the end of the terminal descrip-
tion. You should not rely upon this behavior in portable programs.
This implementation disallows matches against single-character ca-
pability names.
<STRONG>o</STRONG> This implementation disallows matches by the termcap interface
against extended capability names which are longer than two charac-
ters.
</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
<STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="terminfo.5.html">terminfo(5)</A></STRONG>, <STRONG><A HREF="term_variables.3x.html">term_variables(3x)</A></STRONG>, <STRONG>putc(3)</STRONG>.
https://invisible-island.net/ncurses/tctest.html
<STRONG><A HREF="curs_termcap.3x.html">curs_termcap(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>
<ul>
<li><a href="#h3-INITIALIZATION">INITIALIZATION</a></li>
<li><a href="#h3-CAPABILITY-VALUES">CAPABILITY VALUES</a></li>
<li><a href="#h3-FORMATTING-CAPABILITIES">FORMATTING CAPABILITIES</a></li>
<li><a href="#h3-GLOBAL-VARIABLES">GLOBAL VARIABLES</a></li>
</ul>
</li>
<li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
<li><a href="#h2-BUGS">BUGS</a></li>
<li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
<li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
</ul>
</div>
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