.\"***************************************************************************
-.\" Copyright (c) 1998,2000 Free Software Foundation, Inc. *
+.\" Copyright (c) 1998-2001,2002 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 *
.\" authorization. *
.\"***************************************************************************
.\"
-.\" $Id: curs_termcap.3x,v 1.13 2000/07/01 20:10:57 tom Exp $
+.\" $Id: curs_termcap.3x,v 1.16 2002/02/16 19:26:41 tom Exp $
.TH curs_termcap 3X ""
.ds n 5
.SH NAME
.br
\fB#include <term.h>\fR
.br
-\fBint tgetent(const char *bp, char *name);\fR
+\fBextern char PC;\fR
+\fBextern char * UP;\fR
+\fBextern char * BC;\fR
+\fBextern @NCURSES_OSPEED@ ospeed;\fR
.br
-\fBint tgetflag(const char *id);\fR
+\fBint tgetent(char *bp, const char *name);\fR
.br
-\fBint tgetnum(const char *id);\fR
+\fBint tgetflag(char *id);\fR
.br
-\fBchar *tgetstr(const char *id, char **area);\fR
+\fBint tgetnum(char *id);\fR
+.br
+\fBchar *tgetstr(char *id, char **area);\fR
.br
\fBchar *tgoto(const char *cap, int col, int row);\fR
.br
and the \fIarea\fR value will be updated to point past the null ending
this value.
+Only the first two characters of the \fBid\fR parameter of
+\fBtgetflag\fR,
+\fBtgetnum\fR and
+\fBtgetstr\fR are compared in lookups.
+
The \fBtgoto\fR routine instantiates the parameters into the given capability.
The output from this routine is to be passed to \fBtputs\fR.
The \fBtputs\fR routine is described on the \fBcurs_terminfo\fR(3X) manual
page. It can retrieve capabilities by either termcap or terminfo name.
+The variables
+\fBPC\fR,
+\fBUP\fR and
+\fBBC\fR
+are set by \fBtgetent\fR to the terminfo entry's data for
+\fBpad_char\fR,
+\fBcursor_up\fR and
+\fBbackspace_if_not_bs\fR,
+respectively.
+\fBUP\fR is not used by ncurses.
+\fBPC\fR is used in the \fBtdelay_output\fR function.
+\fBBC\fR is used in the \fBtgoto\fR emulation.
+The variable \fBospeed\fR is set by ncurses in a system-specific coding
+to reflect the terminal speed.
+
.SH RETURN VALUE
Except where explicitly noted,
routines that return an integer return \fBERR\fR upon failure and \fBOK\fR
be aware that it will be returned in terminfo notation, not the older and
not-quite-compatible termcap notation. This won't cause problems if all
you do with it is call \fBtgoto\fR or \fBtparm\fR, which both expand
-terminfo-style.
+terminfo-style strings as terminfo.
+(The \fBtgoto\fR function, if configured 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, \fBtputs("50");\fR will put out a literal "50" rather
Neither the XSI Curses standard nor the SVr4 man pages documented the return
values of \fBtgetent\fR correctly, though all three were in fact returned ever
since SVr1.
+In particular, an omission in the XSI Curses documentation has been
+misinterpreted to mean that \fBtgetent\fR returns \fBOK\fR or \fBERR\fR.
+Because the purpose of these functions is to provide compatibility with
+the \fItermcap\fR 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 distinguishing between input and output.
+In particular, some applications are reported to declare and/or
+modify \fBospeed\fR.
.SH SEE ALSO
\fBcurses\fR(3X), \fBterminfo\fR(\*n), \fBputc\fR(3S).
.\"#
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