<!--
****************************************************************************
- * Copyright (c) 1998-2016,2017 Free Software Foundation, Inc. *
+ * Copyright (c) 1998-2017,2018 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 *
* sale, use or other dealings in this Software without prior written *
* authorization. *
****************************************************************************
- * @Id: curs_termcap.3x,v 1.33 2017/01/07 19:25:15 tom Exp @
+ * @Id: curs_termcap.3x,v 1.40 2018/07/28 21:14:06 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 http://invisible-island.net/scripts/readme.html#others_scripts">
+<meta name="generator" content="Manpage converted by man2html - see https://invisible-island.net/scripts/readme.html#others_scripts">
<TITLE>curs_termcap 3x</TITLE>
<link rev=made href="mailto:bug-ncurses@gnu.org">
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<BODY>
<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>
+<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
+ <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>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(char</STRONG> <STRONG>*id);</STRONG>
- <STRONG>int</STRONG> <STRONG>tgetnum(char</STRONG> <STRONG>*id);</STRONG>
- <STRONG>char</STRONG> <STRONG>*tgetstr(char</STRONG> <STRONG>*id,</STRONG> <STRONG>char</STRONG> <STRONG>**area);</STRONG>
+ <STRONG>int</STRONG> <STRONG>tgetent(const</STRONG> <STRONG>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 pro-
- grams 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 capa-
- bilities of entries for which a terminfo entry has been
- compiled.
+ 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>
1 on success,
- 0 if there is no such entry (or that it is a generic
- type, having too little information for curses ap-
- plications to run), and
+ 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> library would store a copy of the terminal
- description in the area referenced by this pointer.
- However, ncurses stores its terminal descriptions
- in compiled binary form, which is not the same
+ <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-addressing.
+ <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 ze-
- ro if it is not available.
+ 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>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 re-
- turned string. The <EM>area</EM> parameter is used as follows:
+ 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> 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 also that the resulting buffer pointer is
- not NULL. If either check fails, the <EM>area</EM> parame-
- ter is ignored.
+ <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 re-
- turn value to the buffer pointed to by <EM>area</EM>, and
- the <EM>area</EM> value will be updated to point past the
- null ending this value.
+ <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 termi-
- nal description which is loaded into memory.
+ <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>tget-</STRONG>
- <STRONG>flag</STRONG>, <STRONG>tgetnum</STRONG> and <STRONG>tgetstr</STRONG> are compared in lookups.
+ 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.
+ 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 function such as <STRONG>printf</STRONG>.
+ <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-parame-
- ter cursor positioning capability, termcap applica-
- tions also use it for single-parameter capabilities.
+ <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 ter-
- minals use cursor 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.
+ 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).
+ <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).
- 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 term-
- cap or terminfo name.
+ 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 ter-
- minfo 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 ter-
- minal speed.
+ 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 in-
- teger return <STRONG>ERR</STRONG> upon failure and <STRONG>OK</STRONG> (SVr4 only specifies
- "an integer value other than <STRONG>ERR</STRONG>") upon successful comple-
- tion.
+ 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 no-
- tation, not the older and not-quite-compatible termcap no-
- tation. 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 con-
- figured to support termcap, will check if the string is
- indeed terminfo-style by looking for "%p" parameters or
- "$<..>" delays, and invoke a termcap-style parser if the
- string does not appear to be terminfo).
-
- Because terminfo conventions for representing padding in
- string capabilities differ from termcap's, <STRONG>tputs("50");</STRONG>
- will put out a literal "50" rather than busy-waiting for
- 50 milliseconds. Cope with it.
-
- Note that termcap has nothing analogous to terminfo's <STRONG>sgr</STRONG>
- string. One consequence of this is that termcap applica-
- tions assume me (terminfo <STRONG>sgr0</STRONG>) does not reset the alter-
- nate character set. This implementation checks for, and
- modifies the data shown to the termcap interface to accom-
- modate termcap's limitation in this respect.
+ If you call <STRONG>tgetstr</STRONG> to fetch <STRONG>ca</STRONG> or any other parameterized string, be
+ aware that it will be returned in terminfo notation, not the older and
+ not-quite-compatible termcap notation. This will not cause problems if
+ all you do with it is call <STRONG>tgoto</STRONG> or <STRONG>tparm</STRONG>, which both expand terminfo-
+ style strings as terminfo. (The <STRONG>tgoto</STRONG> function, if configured to sup-
+ port termcap, will check if the string is indeed terminfo-style by
+ looking for "%p" parameters or "$<..>" 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>
- The XSI Curses standard, Issue 4 describes these func-
- tions. However, they are marked TO BE WITHDRAWN and may
- be removed in future versions.
-
- 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 returned ever since SVr1. In par-
- ticular, 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
- compatibility 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 applications. However, termcap applications' use
- of those variables is poorly documented, e.g., not distin-
- guishing between input and output. In particular, some
- applications are reported to declare and/or modify <STRONG>ospeed</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. Tak-
- ing into account these issues:
-
- <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 description. You should not rely upon
- this behavior in portable programs. This implementa-
- tion disallows matches against single-character capa-
- bility names.
-
- <STRONG>o</STRONG> This implementation disallows matches by the termcap
- interface against extended capability names which are
- longer than two characters.
+ 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>.
- http://invisible-island.net/ncurses/tctest.html
+ https://invisible-island.net/ncurses/tctest.html
- <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>
<div class="nav">
<ul>
projects / ncurses.git / blobdiff