498 lines
12 KiB
Groff
498 lines
12 KiB
Groff
.\" $NetBSD: termcap.3,v 1.29 2003/08/07 16:44:56 agc Exp $
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.\"
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.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)termcap.3 8.2 (Berkeley) 12/11/93
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.\"
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.Dd September 30, 1999
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.Dt TERMCAP 3
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.Os
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.Sh NAME
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.Nm tgetent ,
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.Nm tgetnum ,
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.Nm tgetflag ,
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.Nm tgetstr ,
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.Nm tgoto ,
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.Nm tputs
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.Nd terminal independent operation routines
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.Sh LIBRARY
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.Lb libtermcap
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.Sh SYNOPSIS
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.In termcap.h
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.Vt char PC;
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.Vt char *BC;
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.Vt char *UP;
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.Vt short ospeed;
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.Vt struct tinfo *info;
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.Ft int
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.Fn tgetent "char *bp" "const char *name"
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.Ft int
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.Fn tgetnum "const char *id"
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.Ft int
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.Fn tgetflag "const char *id"
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.Ft char *
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.Fn tgetstr "const char *id" "char **area"
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.Ft char *
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.Fn tgoto "const char *cm" "int destcol" "int destline"
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.Ft void
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.Fn tputs "const char *cp" "int affcnt" "int (*outc)(int)"
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.Ft int
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.Fn t_getent "struct tinfo **info" "const char *name"
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.Ft int
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.Fn t_getnum "struct tinfo *info" "const char *id"
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.Ft int
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.Fn t_getflag "struct tinfo *info" "const char *id"
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.Ft char *
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.Fn t_getstr "struct tinfo *info" "const char *id" "char **area" "size_t *limit"
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.Ft char *
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.Fn t_agetstr "struct tinfo *info" "const char *id"
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.Ft int
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.Fn t_getterm "struct tinfo *info" "char **area" "size_t *limit"
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.Ft int
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.Fn t_goto "struct tinfo *info" "const char *id" "int destcol" "int destline" "char *buffer" "size_t limit"
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.Ft int
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.Fn t_puts "struct tinfo *info" "const char *cp" "int affcnt" "void (*outc)(char, void *)" "void *args"
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.Ft void
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.Fn t_freent "struct tinfo *info"
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.Ft int
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.Fn t_setinfo "struct tinfo **info" "const char *entry"
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.Sh DESCRIPTION
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These functions extract and use capabilities from a terminal capability data
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base, usually
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.Pa /usr/share/misc/termcap ,
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the format of which is described in
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.Xr termcap 5 .
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These are low level routines;
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see
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.Xr curses 3
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for a higher level package.
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.Pp
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The
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.Fn tgetent
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function
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extracts the entry for terminal
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.Fa name
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into the buffer at
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.Fa bp .
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The
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.Fa bp
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argument
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should be a character buffer of size
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1024 and must be retained through all subsequent calls to
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.Fn tgetnum ,
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.Fn tgetflag ,
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and
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.Fn tgetstr .
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The
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.Fn tgetent
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function
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returns \-1 if none of the
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.Nm termcap
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data base files could be opened,
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0 if the terminal name given does not have an entry,
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and 1 if all goes well.
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It will look in the environment for a
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.Ev TERMCAP
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variable.
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If found, and the value does not begin with a slash, the value does
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not contain the ZZ capability (see
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.Em NOTES
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for a description of this capability),
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and the terminal type
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.Fa name
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is the same as the environment string
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.Ev TERM ,
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the
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.Ev TERMCAP
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string is used instead of reading a
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.Nm termcap
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file.
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If the value does contain the ZZ capability then the
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.Ev TERM
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environment string is used to read
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.Nm termcap ,
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if the read fails for any reason the value of
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.Ev TERMCAP
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will be used despite it containing ZZ.
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If
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.Ev TERMCAP
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does begin with a slash, the string is used as a path name
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of the
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.Nm termcap
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file to search.
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If
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.Ev TERMCAP
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does not begin with a slash and
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.Fa name
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is different from
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.Ev TERM ,
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.Fn tgetent
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searches the files
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.Pa $HOME/.termcap
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and
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.Pa /usr/share/misc/termcap ,
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in that order, unless the environment variable
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.Ev TERMPATH
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exists,
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in which case it specifies a list of file pathnames
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(separated by spaces or colons) to be searched instead.
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Whenever multiple files are searched and a
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.Sy tc
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field occurs in the requested entry, the entry it names must be found
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in the same file or one of the succeeding files.
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This can speed up entry into programs that call
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.Fn tgetent ,
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as well as help debug new terminal descriptions
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or make one for your terminal if you can't write the file
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.Pa /usr/share/misc/termcap .
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.Pp
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The
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.Fn tgetnum
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function
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gets the numeric value of capability
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.Fa id ,
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returning \-1 if it is not given for the terminal.
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The
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.Fn tgetflag
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function
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returns 1 if the specified capability is present in
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the terminal's entry, 0 if it is not.
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The
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.Fn tgetstr
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function
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returns the string value of the capability
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.Fa id ,
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places it in the buffer at
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.Fa area ,
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and advances the
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.Fa area
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pointer.
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It decodes the abbreviations for this field described in
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.Xr termcap 5 ,
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except for cursor addressing and padding information.
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The
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.Fn tgetstr
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function
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returns
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.Dv NULL
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if the capability was not found.
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.Pp
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The
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.Fn tgoto
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function
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returns a cursor addressing string decoded from
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.Fa cm
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to go to column
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.Fa destcol
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in line
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.Fa destline .
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It uses the external variables
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.Va UP
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(from the
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.Sy up
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capability)
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and
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.Va BC
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(if
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.Sy bc
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is given rather than
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.Sy bs )
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if necessary to avoid placing
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.Sy \en ,
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.Sy ^D
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or
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.Sy ^@
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in
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the returned string.
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(Programs which call
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.Fn tgoto
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should be sure to turn off the
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.Dv XTABS
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bit(s),
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since
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.Fn tgoto
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may now output a tab.
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Note that programs using termcap should in general turn off
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.Dv XTABS
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anyway since some terminals use control-I for other functions,
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such as nondestructive space.)
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If a
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.Sy %
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sequence is given which is not understood, then
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.Fn tgoto
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returns
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.Pq Dv OOPS .
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.Pp
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The
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.Fn tputs
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function
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decodes the leading padding information of the string
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.Fa cp ;
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.Fa affcnt
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gives the number of lines affected by the operation, or 1 if this is
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not applicable,
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.Fa outc
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is a routine which is called with each character in turn.
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The external variable
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.Va ospeed
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should contain the output speed of the terminal as encoded by
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.Xr stty 3 .
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The external variable
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.Va PC
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should contain a pad character to be used (from the
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.Sy pc
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capability)
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if a null
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.Pq Sy ^@
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is inappropriate.
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.Pp
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The
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.Fn t_getent
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function operates in a similar manner to the
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.Fn tgetent
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function excepting that the
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.Fa info
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argument is a pointer to a pointer of the opaque type
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.Va tinfo .
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If the call to
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.Fn t_getent
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succeeds then the argument
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.Fa info
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will be updated with the address of an object that contains the termcap
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entry.
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This pointer can then be passed to calls of
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.Fn t_getnum ,
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.Fn t_getflag
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and
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.Fn t_getstr .
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When the information pointed to by
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.Fa info
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is no longer required any storage associated with the object can be
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released by calling
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.Fn t_freent .
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.Pp
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The functions
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.Fn t_getnum
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and
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.Fn t_getflag
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operate in the same manner as
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.Fn tgetnum
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and
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.Fn tgetflag
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with the exception that the pointer to the termcap object is passed along
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with the id of the capability required.
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.Pp
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The function
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.Fn t_getstr
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performs the same function as
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.Fn tgetstr
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but has a
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.Fa limit
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parameter that gives the number of characters that can be inserted in to
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the array pointed to by
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.Fa area .
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The
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.Fa limit
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argument is updated by the
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.Fn t_getstr
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call to give the number of characters that remain available in
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.Fa area .
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If the t_getstr call fails then
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.Dv NULL
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will be returned and errno set to indicate the failure,
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.Er ENOENT
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indicates there was no termcap entry for the given
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.Fa id ,
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.Er E2BIG
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indicates the retrieved entry would have overflowed
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.Fa area .
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If t_getstr is called with
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.Fa area
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being
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.Dv NULL
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then the size required to hold the capability string will be returned in
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.Fa limit
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so the caller can allocate enough storage to hold the capability.
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.Pp
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The function
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.Fn t_agetstr
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performs the same function as
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.Fn t_getstr
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except it handles memory allocation automatically.
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The memory that
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.Fn t_agetstr
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allocates will be freed when
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.Fn t_freent
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is called.
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.Pp
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The function
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.Fn t_getterm
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returns a copy of the termcap name string of the termcap entry
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associated with
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.Fa info
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in the buffer pointed to by
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.Fa area .
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.Fn t_getterm
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returns 0 on success and \-1 on error.
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On error errno will be set to
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.Er EINVAL
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if the termcap entry in
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.Fa info
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is malformed or
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.Er E2BIG
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if the size of the name exceeds the size specified by
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.Fa limit .
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If
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.Fa area
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is
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.Dv NULL
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then the size required to hold the terminal name will be returned in
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.Fa limit
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allowing sufficient storage to be allocated.
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If
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.Fa limit
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is
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.Dv NULL
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then no bounds checking will be performed.
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.Pp
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The
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.Fn t_goto
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function is the same as the
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.Fn tgoto
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function excepting that the capabilities for
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.Sy up
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and
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.Sy bc
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are extracted from the
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.Fa info
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object and that the string formed by
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.Fn t_goto
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is placed in the
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.Fa buffer
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argument, the number of characters allowed to be placed in
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.Fa buffer
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is controlled by
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.Fa limit .
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If the expansion performed by
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.Fn t_goto
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would exceed the space in
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.Fa buffer
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then
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.Fn t_goto
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will return \-1 and set errno to
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.Er E2BIG .
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The function
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.Fn t_puts
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is similar to the
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.Fn tputs
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function excepting that
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.Fa info
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holds a pointer to the termcap object that was returned by a previous
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.Fn t_getent
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call, this object will be used to retrieve the
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.Sy pc
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attribute for the terminal.
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The
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.Fa outc
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function is a pointer to a function that will be called by
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.Fn t_puts
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to output each character in the
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.Fa cp
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string.
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The
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.Fa outc
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function will be called with two parameters.
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The first is the character
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to be printed and the second is an optional argument that was passed to
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.Fn t_puts
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in the
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.Fa args
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argument.
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The interpretation of the contents of
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.Fa args
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is dependent solely on the implementation of
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.Fa outc .
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.Pp
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The
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.Fn t_setinfo
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function allows the termcap entry contained in the
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.Fa entry
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string to be inserted into the the
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.Fa info
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structure.
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Memory sufficient to hold the contents of
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.Fa entry
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is automatically allocated.
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This allows the programmer to provide a fail over terminal capability
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string if fetching the termcap entry from the termcap database fails.
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The format of the string
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.Fa entry
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is assumed to be a valid termcap entry.
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.Pp
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NOTE: A special capability of
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.Fa ZZ
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is added to the end of the termcap entry retrieved.
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The number that follows this entry is the address of the buffer allocated
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to hold the full termcap entry.
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The caller may retrieve the pointer to the extended buffer by performing a
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.Fn tgetstr
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to retrieve the
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.Fa ZZ
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capability, the string is the output of a
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.Fn printf
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%p and may be converted back to a pointer using
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.Fn sscanf
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or similar.
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The ZZ capability is only necessary if the caller wishes to
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directly manipulate the termcap entry, all the termcap function calls
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automatically use the extended buffer to retrieve terminal capabilities.
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.Sh FILES
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.Bl -tag -width /usr/share/misc/termcap -compact
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.It Pa /usr/lib/libtermcap.a
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.Fl l Ar termcap
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library (also known as
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.Fl l Ar termlib )
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.It Pa /usr/share/misc/termcap
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standard terminal capability data base
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.It Pa $HOME/.termcap
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user's terminal capability data base
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.El
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.Sh SEE ALSO
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.Xr ex 1 ,
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.Xr curses 3 ,
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.Xr termcap 5
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.Sh HISTORY
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The
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.Nm termcap
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t_*() functions appeared in
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.Nx 1.5 .
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The rest of the
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.Nm termcap
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functions appeared in
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.Bx 4.0 .
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