Add an implementation of the tabs(1) utility, as required by SUSv3.
PR: 36126
This commit is contained in:
Tim J. Robbins
parent
8a9bbbc50a
commit
890a73ed39
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=97033
7
usr.bin/tabs/Makefile
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7
usr.bin/tabs/Makefile
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@ -0,0 +1,7 @@
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# $FreeBSD$
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PROG= tabs
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DPADD= ${LIBTERMCAP}
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LDADD= -ltermcap
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.include <bsd.prog.mk>
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147
usr.bin/tabs/tabs.1
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147
usr.bin/tabs/tabs.1
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.\" Copyright (c) 2002 Tim J. Robbins.
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.\" 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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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.\" $FreeBSD$
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.\"
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.Dd May 20, 2002
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.Dt TABS 1
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.Os
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.Sh NAME
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.Nm tabs
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.Nd set terminal tabs
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.Sh SYNOPSIS
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.Nm
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.Op Fl Ar n | Fl a | a2 | c | c2 | c3 | f | p | s | u
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.Op Cm +m Ns Op Ar n
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.Op Fl T Ar type
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.Nm
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.Op Fl T Ar type
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.Op Cm + Ns Op Ar n
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.Ar n1 Ns Op Ns , Ns Ar n2 , Ns ...
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.Sh DESCRIPTION
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The
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.Nm
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utility displays a series of characters that clear the hardware terminal
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tab settings then initialises tab stops at specified positions, and
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optionally adjusts the margin.
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.Pp
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In the first synopsis form, the tab stops set depend on the command line
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options used, and may be one of the predefined formats or at regular
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intervals.
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.Pp
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In the second synopsis form, tab stops are set at positions
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.Ar n1 , Ar n2 ,
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etc.
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If a position is preceded by a
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.Ql + ,
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it is relative to the previous position set.
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No more than 20 positions may be specified.
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.Pp
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If no tab stops are specified, the
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.Sq standard
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.Tn UNIX
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tab width of 8 is used.
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.Pp
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The options are as follows:
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.Bl -tag -width indent
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.It Fl Ar n
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Set a tab stop every
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.Ar n
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columns.
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If
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.Ar n
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is 0, the tab stops are cleared but no new ones are set.
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.It Fl a
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Assembler format (columns 1, 10, 16, 36, 72).
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.It Fl a2
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Assembler format (columns 1, 10, 16, 40, 72).
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.It Fl c
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COBOL normal format (columns 1, 8, 12, 16, 20, 55)
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.It Fl c2
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COBOL compact format (columns 1, 6, 10, 14, 49)
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.It Fl c3
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COBOL compact format (columns 1, 6, 10, 14, 18, 22, 26, 30, 34, 38, 42, 46,
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50, 54, 58, 62, 67).
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.It Fl f
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FORTRAN format (columns 1, 7, 11, 15, 19, 23).
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.It Fl p
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PL/1 format (columns 1, 5, 9, 13, 17, 21, 25, 29, 33, 37, 41, 45, 49, 53,
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57, 61).
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.It Fl s
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SNOBOL format (columns 1, 10, 55).
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.It Fl u
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Assembler format (columns 1, 12, 20, 44).
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.It Xo
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.Cm +m Ns Op Ar n ,
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.Cm + Ns Op Ar n
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.Xc
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Set an
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.Ar n
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character left margin, or 10 if
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.Ar n
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is omitted.
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.It Fl T Ar type
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Output escape sequence for the terminal type
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.Ar type .
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.El
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.Sh ENVIRONMENT
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.Bl -tag -width indent
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.It Ev TERM
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Terminal type unless overridden by the
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.Fl T
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option.
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If the
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.Ev TERM
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environment variable is unset and the
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.Fl T
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option is not given,
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.Nm
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will fail.
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.El
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.Sh DIAGNOSTICS
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.Ex -std
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.Sh SEE ALSO
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.Xr expand 1 ,
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.Xr stty 1 ,
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.Xr tput 1 ,
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.Xr unexpand 1 ,
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.Xr termcap 5
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.Sh STANDARDS
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The
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.Nm
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utility conforms to
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.St -p1003.1-2001 .
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.Sh HISTORY
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A
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.Nm
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utility appeared in
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.At v7 .
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This implementation was introduced in
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.Fx 5.0 .
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.Sh BUGS
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The current
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.Xr termcap 5
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database does not define the
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.Ql ML
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(set left soft margin) capability for any terminals.
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234
usr.bin/tabs/tabs.c
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234
usr.bin/tabs/tabs.c
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/*-
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* Copyright (c) 2002 Tim J. Robbins.
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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/*
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* tabs -- set terminal tabs
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*
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* This utility displays a series of characters that clears the terminal
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* hardware tab settings, then initialises them to specified values,
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* and optionally sets a soft margin.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/tty.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <locale.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <term.h>
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#include <unistd.h>
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/* Maximum number of tab stops allowed in table. */
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#define NSTOPS 20
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#define NELEMS(a) (sizeof(a) / sizeof(a[0]))
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/* Predefined formats, taken from IEEE Std 1003.1-2001. */
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static const struct {
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const char *name; /* Format name used on cmd. line */
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long stops[NSTOPS]; /* Column positions */
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} formats[] = {
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{ "a", { 1, 10, 16, 36, 72 } },
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{ "a2", { 1, 10, 16, 40, 72 } },
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{ "c", { 1, 8, 12, 16, 20, 55 } },
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{ "c2", { 1, 6, 10, 14, 49 } },
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{ "c3", { 1, 6, 10, 14, 18, 22, 26, 30, 34, 38, 42, 46, 50, 54, 58,
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62, 67 } },
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{ "f", { 1, 7, 11, 15, 19, 23 } },
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{ "p", { 1, 5, 9, 13, 17, 21, 25, 29, 33, 37, 41, 45, 49, 53, 57,
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61 } },
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{ "s", { 1, 10, 55 } },
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{ "u", { 1, 12, 20, 44 } }
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};
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static void gettabs(char *, long *, long *);
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static int ttywidth(void);
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static void usage(void);
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int
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main(int argc, char *argv[])
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{
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long cols, i, inc, j, margin, nstops, stops[NSTOPS];
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const char *cr, *ct, *st, *ML;
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char area[1024], *ap, *arg, *end;
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setlocale(LC_ALL, "");
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inc = 8;
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margin = 0;
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nstops = -1;
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while ((arg = *++argv) != NULL && (*arg == '-' || *arg == '+')) {
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if (*arg == '+') {
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/* +m[n] or +[n] */
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if (*++arg == 'm')
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arg++;
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if (*arg != '\0') {
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errno = 0;
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margin = strtol(arg, &end, 10);
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if (errno != 0 || *end != '\0' || margin < 0)
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errx(1, "%s: invalid margin width",
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arg);
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} else
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margin = 10;
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} else if (isdigit(arg[1])) {
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/* -n */
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errno = 0;
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inc = strtol(arg + 1, &end, 10);
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if (errno != 0 || *end != '\0' || inc < 0)
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errx(1, "%s: invalid increment", arg + 1);
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} else if (arg[1] == 'T') {
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/* -Ttype or -T type */
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if (arg[2] != '\0')
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setenv("TERM", arg + 2, 1);
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else {
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if ((arg = *++argv) == NULL)
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usage();
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setenv("TERM", arg, 1);
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}
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} else {
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/* Predefined format */
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for (i = 0; i < (int)NELEMS(formats); i++)
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if (strcmp(formats[i].name, arg + 1) == 0)
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break;
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if (i == NELEMS(formats))
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usage();
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for (j = nstops = 0; j < NSTOPS &&
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formats[i].stops[j] != 0; j++)
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stops[nstops++] = formats[i].stops[j];
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}
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}
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if (arg != NULL) {
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if (nstops != -1)
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usage();
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gettabs(arg, stops, &nstops);
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}
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/* Initialise terminal, get the strings we need */
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setupterm(NULL, 1, NULL);
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ap = area;
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if ((ct = tgetstr("ct", &ap)) == NULL)
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errx(1, "terminal cannot clear tabs");
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if ((st = tgetstr("st", &ap)) == NULL)
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errx(1, "terminal cannot set tabs");
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if ((cr = tgetstr("cr", &ap)) == NULL)
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cr = "\r";
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ML = tgetstr("ML", &ap);
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cols = ttywidth();
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/* Clear all tabs. */
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putp(cr);
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putp(ct);
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/*
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* Set soft margin.
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* XXX Does this actually work?
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*/
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if (ML != NULL) {
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printf("%*s", (int)margin, "");
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putp(ML);
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} else if (margin != 0)
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warnx("terminal cannot set left margin");
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/* Optionally output new tab stops. */
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if (nstops >= 0) {
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printf("%*s", (int)stops[0] - 1, "");
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putp(st);
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for (i = 1; i < nstops; i++) {
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printf("%*s", (int)(stops[i] - stops[i - 1]), "");
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putp(st);
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}
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} else if (inc > 0) {
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for (i = 0; i < cols / inc; i++) {
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putp(st);
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printf("%*s", (int)inc, "");
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}
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putp(st);
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}
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putp(cr);
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exit(0);
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}
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static void
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usage(void)
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{
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fprintf(stderr,
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"usage: tabs [-n|-a|-a2|-c|-c2|-c3|-f|-p|-s|-u] [+m[n]] [-T type]\n");
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fprintf(stderr,
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" tabs [-T type] [+[n]] n1,[n2,...]\n");
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exit(1);
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}
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static void
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gettabs(char *arg, long stops[], long *nstops)
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{
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char *tok, *end;
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long last, stop;
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for (last = *nstops = 0, tok = strtok(arg, ","); tok != NULL;
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tok = strtok(NULL, ",")) {
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if (*nstops >= NSTOPS)
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errx(1, "too many tab stops (limit %d)", NSTOPS);
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errno = 0;
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stop = strtol(tok, &end, 10);
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if (errno != 0 || *end != '\0' || stop <= 0)
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errx(1, "%s: invalid tab stop", tok);
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if (*tok == '+') {
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if (tok == arg)
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errx(1, "%s: first tab may not be relative",
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tok);
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stop += last;
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}
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if (last > stop)
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errx(1, "cannot go backwards");
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last = stops[(*nstops)++] = stop;
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}
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}
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static int
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ttywidth(void)
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{
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struct winsize ws;
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int width;
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if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) != -1)
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width = ws.ws_col;
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else if ((width = tgetnum("co")) == 0) {
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width = 80;
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warnx("cannot find terminal width; defaulted to %d", width);
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}
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return (width);
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}
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