Importing usr.bin/col
This commit is contained in:
Thomas Cort
Lionel Sambuc
parent
e232e0cbf0
commit
7b9673cd55
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@ -231,6 +231,7 @@
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./usr/bin/crc minix-sys
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./usr/bin/cron minix-sys
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./usr/bin/crontab minix-sys
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./usr/bin/col minix-sys
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./usr/bin/ctags minix-sys
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./usr/bin/cut minix-sys
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./usr/bin/datasizes minix-sys
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@ -1208,6 +1209,7 @@
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./usr/man/man1/cpio.1 minix-sys
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./usr/man/man1/crc.1 minix-sys
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./usr/man/man1/crontab.1 minix-sys
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./usr/man/man1/col.1 minix-sys
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./usr/man/man1/ctags.1 minix-sys
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./usr/man/man1/cut.1 minix-sys
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./usr/man/man1/date.1 minix-sys
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@ -124,6 +124,7 @@
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2012/10/17 12:00:00,usr.bin/bzip2recover
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2009/04/11 12:10:02,usr.bin/chpass
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2012/10/17 12:00:00,usr.bin/cksum
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2012/10/17 12:00:00,usr.bin/col
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2012/10/17 12:00:00,usr.bin/ctags
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2011/09/01 13:37:33,usr.bin/du
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2012/10/17 12:00:00,usr.bin/genassym
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@ -7,7 +7,7 @@ SUBDIR= \
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\
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bzip2 bzip2recover \
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chpass cksum \
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ctags \
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col ctags \
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du \
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\
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\
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@ -0,0 +1,6 @@
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# $NetBSD: Makefile,v 1.5 2009/04/14 22:15:18 lukem Exp $
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# @(#)Makefile 8.1 (Berkeley) 6/6/93
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PROG= col
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.include <bsd.prog.mk>
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@ -0,0 +1,48 @@
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# @(#)README 8.1 (Berkeley) 6/6/93
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col - filter out reverse line feeds.
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Options are:
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-b do not print any backspaces (last character written is printed)
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-f allow half line feeds in output, by default characters between
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lines are pushed to the line below
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-x do not compress spaces into tabs.
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-l num keep (at least) num lines in memory, 128 are kept by default
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In the 32V source code to col(1) the default behavior was to NOT compress
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spaces into tabs. There was a -h option which caused it to compress spaces
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into tabs. There was no -x flag.
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The 32V documentation, however, was consistent with the SVID (actually, V7
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at the time) and documented a -x flag (as defined above) while making no
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mention of a -h flag. Just before 4.3BSD went out, CSRG updated the manual
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page to reflect the way the code worked. Suspecting that this was probably
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the wrong way to go, this version adopts the SVID defaults, and no longer
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documents the -h option.
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The S5 -p flag is not supported because it isn't clear what it does (looks
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like a kludge introduced for a particular printer).
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Known differences between AT&T's col and this one (# is delimiter):
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Input AT&T col this col
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#\nabc\E7def\n# # def\nabc\r# # def\nabc\n#
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#a# ## #a\n#
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- last line always ends with at least one \n (or \E9)
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#1234567 8\n# #1234567\t8\n# #1234567 8\n#
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- single space not expanded to tab
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-f #a\E8b\n# #ab\n# # b\E9\ra\n#
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- can back up past first line (as far as you want) so you
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*can* have a super script on the first line
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#\E9_\ba\E8\nb\n# #\n_\bb\ba\n# #\n_\ba\bb\n#
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- always print last character written to a position,
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AT&T col claims to do this but doesn't.
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If a character is to be placed on a line that has been flushed, a warning
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is produced (the AT&T col is silent). The -l flag (not in AT&T col) can
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be used to increase the number of lines buffered to avoid the problem.
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General algorithm: a limited number of lines are buffered in a linked
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list. When a printable character is read, it is put in the buffer of
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the current line along with the column it's supposed to be in. When
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a line is flushed, the characters in the line are sorted according to
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column and then printed.
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@ -0,0 +1,138 @@
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.\" $NetBSD: col.1,v 1.10 2012/03/22 07:58:18 wiz Exp $
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.\"
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.\" Copyright (c) 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" Michael Rendell.
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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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.\" @(#)col.1 8.1 (Berkeley) 6/29/93
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.\"
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.Dd February 22, 1999
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.Dt COL 1
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.Os
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.Sh NAME
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.Nm col
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.Nd filter reverse line feeds from input
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.Sh SYNOPSIS
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.Nm
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.Op Fl bfpx
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.Op Fl l Ar num
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.Sh DESCRIPTION
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.Nm
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filters out reverse (and half reverse) line feeds so that the output is
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in the correct order with only forward and half forward line
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feeds, and replaces white-space characters with tabs where possible.
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This can be useful in processing the output of
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.Xr nroff 1
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and
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.Xr tbl 1 .
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.Pp
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.Nm
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reads from the standard input and writes to the standard output.
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.Pp
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The options are as follows:
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.Bl -tag -width "-l num "
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.It Fl b
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Do not output any backspaces, printing only the last character
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written to each column position.
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.It Fl f
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Forward half line feeds are permitted (``fine'' mode).
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Normally characters printed on a half line boundary are printed
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on the following line.
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.It Fl p
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Force unknown control sequences to be passed through unchanged.
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Normally,
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.Nm
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will filter out any control sequences from the input other than those
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recognized and interpreted by itself, which are listed below.
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.It Fl x
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Output multiple spaces instead of tabs.
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.It Fl l Ar num
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Buffer at least
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.Ar num
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lines in memory.
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By default, 128 lines are buffered.
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.El
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.Pp
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The control sequences for carriage motion that
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.Nm
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understands and their decimal values are listed in the following
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table:
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.Pp
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.Bl -tag -width "carriage return" -compact
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.It ESC\-7
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reverse line feed (escape then 7)
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.It ESC\-8
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half reverse line feed (escape then 8)
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.It ESC\-9
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half forward line feed (escape then 9)
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.It backspace
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moves back one column (8); ignored in the first column
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.It carriage return
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(13)
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.It newline
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forward line feed (10); also does carriage return
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.It shift in
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shift to normal character set (15)
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.It shift out
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shift to alternative character set (14)
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.It space
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moves forward one column (32)
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.It tab
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moves forward to next tab stop (9)
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.It vertical tab
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reverse line feed (11)
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.El
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.Pp
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All unrecognized control characters and escape sequences are
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discarded.
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.Pp
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.Nm
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keeps track of the character set as characters are read and makes
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sure the character set is correct when they are output.
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.Pp
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If the input attempts to back up to the last flushed line,
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.Nm
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will display a warning message.
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.Sh SEE ALSO
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.Xr expand 1 ,
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.Xr nroff 1 ,
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.Xr tbl 1
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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 -xpg4.2 .
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The
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.Fl l
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option is an extension to the standard.
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.Sh HISTORY
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A
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.Nm
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command appeared in
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.At v6 .
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@ -0,0 +1,542 @@
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/* $NetBSD: col.c,v 1.17 2011/08/31 16:24:57 plunky Exp $ */
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/*-
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* Copyright (c) 1990, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Michael Rendell of the Memorial University of Newfoundland.
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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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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1990, 1993, 1994\
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The Regents of the University of California. All rights reserved.");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)col.c 8.5 (Berkeley) 5/4/95";
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#endif
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__RCSID("$NetBSD: col.c,v 1.17 2011/08/31 16:24:57 plunky Exp $");
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#endif /* not lint */
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#include <ctype.h>
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#include <err.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#define BS '\b' /* backspace */
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#define TAB '\t' /* tab */
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#define SPACE ' ' /* space */
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#define NL '\n' /* newline */
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#define CR '\r' /* carriage return */
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#define ESC '\033' /* escape */
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#define SI '\017' /* shift in to normal character set */
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#define SO '\016' /* shift out to alternate character set */
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#define VT '\013' /* vertical tab (aka reverse line feed) */
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#define RLF '\007' /* ESC-07 reverse line feed */
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#define RHLF '\010' /* ESC-010 reverse half-line feed */
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#define FHLF '\011' /* ESC-011 forward half-line feed */
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/* build up at least this many lines before flushing them out */
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#define BUFFER_MARGIN 32
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typedef char CSET;
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typedef struct char_str {
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#define CS_NORMAL 1
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#define CS_ALTERNATE 2
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short c_column; /* column character is in */
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CSET c_set; /* character set (currently only 2) */
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char c_char; /* character in question */
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} CHAR;
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typedef struct line_str LINE;
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struct line_str {
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CHAR *l_line; /* characters on the line */
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LINE *l_prev; /* previous line */
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LINE *l_next; /* next line */
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int l_lsize; /* allocated sizeof l_line */
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int l_line_len; /* strlen(l_line) */
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int l_needs_sort; /* set if chars went in out of order */
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int l_max_col; /* max column in the line */
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};
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static LINE *alloc_line(void);
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static void dowarn(int);
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static void flush_line(LINE *);
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static void flush_lines(int);
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static void flush_blanks(void);
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static void free_line(LINE *);
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__dead static void usage(void);
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__dead static void wrerr(void);
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static void *xmalloc(void *, size_t);
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static CSET last_set; /* char_set of last char printed */
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static LINE *lines;
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static int compress_spaces; /* if doing space -> tab conversion */
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static int fine; /* if `fine' resolution (half lines) */
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static int max_bufd_lines; /* max # lines to keep in memory */
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static int nblank_lines; /* # blanks after last flushed line */
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static int no_backspaces; /* if not to output any backspaces */
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static int pass_unknown_seqs; /* whether to pass unknown control sequences */
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#define PUTC(ch) \
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if (putchar(ch) == EOF) \
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wrerr();
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int
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main(int argc, char **argv)
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{
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int ch;
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CHAR *c;
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CSET cur_set; /* current character set */
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LINE *l; /* current line */
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int extra_lines; /* # of lines above first line */
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int cur_col; /* current column */
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int cur_line; /* line number of current position */
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int max_line; /* max value of cur_line */
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int this_line; /* line l points to */
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int nflushd_lines; /* number of lines that were flushed */
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int adjust, opt, warned;
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max_bufd_lines = 128;
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compress_spaces = 1; /* compress spaces into tabs */
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pass_unknown_seqs = 0; /* remove unknown escape sequences */
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while ((opt = getopt(argc, argv, "bfhl:px")) != -1)
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switch (opt) {
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case 'b': /* do not output backspaces */
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no_backspaces = 1;
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break;
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case 'f': /* allow half forward line feeds */
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fine = 1;
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break;
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case 'h': /* compress spaces into tabs */
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compress_spaces = 1;
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break;
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case 'l': /* buffered line count */
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if ((max_bufd_lines = atoi(optarg)) <= 0) {
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(void)fprintf(stderr,
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"col: bad -l argument %s.\n", optarg);
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exit(EXIT_FAILURE);
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}
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break;
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case 'p': /* pass unknown control sequences */
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pass_unknown_seqs = 1;
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break;
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case 'x': /* do not compress spaces into tabs */
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compress_spaces = 0;
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break;
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case '?':
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default:
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usage();
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}
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if (optind != argc)
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usage();
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/* this value is in half lines */
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max_bufd_lines *= 2;
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adjust = cur_col = extra_lines = warned = 0;
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cur_line = max_line = nflushd_lines = this_line = 0;
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cur_set = last_set = CS_NORMAL;
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lines = l = alloc_line();
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|
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while ((ch = getchar()) != EOF) {
|
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if (!isgraph(ch)) {
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switch (ch) {
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case BS: /* can't go back further */
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if (cur_col == 0)
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continue;
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--cur_col;
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continue;
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case CR:
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cur_col = 0;
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continue;
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case ESC: /* just ignore EOF */
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switch(getchar()) {
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case RLF:
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cur_line -= 2;
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break;
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case RHLF:
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cur_line--;
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break;
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case FHLF:
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cur_line++;
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if (cur_line > max_line)
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max_line = cur_line;
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}
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continue;
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case NL:
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cur_line += 2;
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if (cur_line > max_line)
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max_line = cur_line;
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cur_col = 0;
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continue;
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case SPACE:
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++cur_col;
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continue;
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case SI:
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cur_set = CS_NORMAL;
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continue;
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case SO:
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cur_set = CS_ALTERNATE;
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continue;
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case TAB: /* adjust column */
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cur_col |= 7;
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++cur_col;
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continue;
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case VT:
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cur_line -= 2;
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continue;
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}
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if (!pass_unknown_seqs)
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continue;
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}
|
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/* Must stuff ch in a line - are we at the right one? */
|
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if (cur_line != this_line - adjust) {
|
||||
LINE *lnew;
|
||||
int nmove;
|
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adjust = 0;
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nmove = cur_line - this_line;
|
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if (!fine) {
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/* round up to next line */
|
||||
if (cur_line & 1) {
|
||||
adjust = 1;
|
||||
nmove++;
|
||||
}
|
||||
}
|
||||
if (nmove < 0) {
|
||||
for (; nmove < 0 && l->l_prev; nmove++)
|
||||
l = l->l_prev;
|
||||
if (nmove) {
|
||||
if (nflushd_lines == 0) {
|
||||
/*
|
||||
* Allow backup past first
|
||||
* line if nothing has been
|
||||
* flushed yet.
|
||||
*/
|
||||
for (; nmove < 0; nmove++) {
|
||||
lnew = alloc_line();
|
||||
l->l_prev = lnew;
|
||||
lnew->l_next = l;
|
||||
l = lines = lnew;
|
||||
extra_lines++;
|
||||
}
|
||||
} else {
|
||||
if (!warned++)
|
||||
dowarn(cur_line);
|
||||
cur_line -= nmove;
|
||||
}
|
||||
}
|
||||
} else {
|
||||
/* may need to allocate here */
|
||||
for (; nmove > 0 && l->l_next; nmove--)
|
||||
l = l->l_next;
|
||||
for (; nmove > 0; nmove--) {
|
||||
lnew = alloc_line();
|
||||
lnew->l_prev = l;
|
||||
l->l_next = lnew;
|
||||
l = lnew;
|
||||
}
|
||||
}
|
||||
this_line = cur_line + adjust;
|
||||
nmove = this_line - nflushd_lines;
|
||||
if (nmove >= max_bufd_lines + BUFFER_MARGIN) {
|
||||
nflushd_lines += nmove - max_bufd_lines;
|
||||
flush_lines(nmove - max_bufd_lines);
|
||||
}
|
||||
}
|
||||
/* grow line's buffer? */
|
||||
if (l->l_line_len + 1 >= l->l_lsize) {
|
||||
int need;
|
||||
|
||||
need = l->l_lsize ? l->l_lsize * 2 : 90;
|
||||
l->l_line = (CHAR *)xmalloc((void *) l->l_line,
|
||||
(unsigned) need * sizeof(CHAR));
|
||||
l->l_lsize = need;
|
||||
}
|
||||
c = &l->l_line[l->l_line_len++];
|
||||
c->c_char = ch;
|
||||
c->c_set = cur_set;
|
||||
c->c_column = cur_col;
|
||||
/*
|
||||
* If things are put in out of order, they will need sorting
|
||||
* when it is flushed.
|
||||
*/
|
||||
if (cur_col < l->l_max_col)
|
||||
l->l_needs_sort = 1;
|
||||
else
|
||||
l->l_max_col = cur_col;
|
||||
cur_col++;
|
||||
}
|
||||
if (max_line == 0)
|
||||
exit(EXIT_SUCCESS); /* no lines, so just exit */
|
||||
|
||||
/* goto the last line that had a character on it */
|
||||
for (; l->l_next; l = l->l_next)
|
||||
this_line++;
|
||||
flush_lines(this_line - nflushd_lines + extra_lines + 1);
|
||||
|
||||
/* make sure we leave things in a sane state */
|
||||
if (last_set != CS_NORMAL)
|
||||
PUTC('\017');
|
||||
|
||||
/* flush out the last few blank lines */
|
||||
nblank_lines = max_line - this_line;
|
||||
if (max_line & 1)
|
||||
nblank_lines++;
|
||||
else if (!nblank_lines)
|
||||
/* missing a \n on the last line? */
|
||||
nblank_lines = 2;
|
||||
flush_blanks();
|
||||
exit(EXIT_SUCCESS);
|
||||
/* NOTREACHED */
|
||||
}
|
||||
|
||||
static void
|
||||
flush_lines(int nflush)
|
||||
{
|
||||
LINE *l;
|
||||
|
||||
while (--nflush >= 0) {
|
||||
l = lines;
|
||||
lines = l->l_next;
|
||||
if (l->l_line) {
|
||||
flush_blanks();
|
||||
flush_line(l);
|
||||
}
|
||||
nblank_lines++;
|
||||
if (l->l_line)
|
||||
(void)free((void *)l->l_line);
|
||||
free_line(l);
|
||||
}
|
||||
if (lines)
|
||||
lines->l_prev = NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* Print a number of newline/half newlines. If fine flag is set, nblank_lines
|
||||
* is the number of half line feeds, otherwise it is the number of whole line
|
||||
* feeds.
|
||||
*/
|
||||
static void
|
||||
flush_blanks(void)
|
||||
{
|
||||
int half, i, nb;
|
||||
|
||||
half = 0;
|
||||
nb = nblank_lines;
|
||||
if (nb & 1) {
|
||||
if (fine)
|
||||
half = 1;
|
||||
else
|
||||
nb++;
|
||||
}
|
||||
nb /= 2;
|
||||
for (i = nb; --i >= 0;)
|
||||
PUTC('\n');
|
||||
if (half) {
|
||||
PUTC('\033');
|
||||
PUTC('9');
|
||||
if (!nb)
|
||||
PUTC('\r');
|
||||
}
|
||||
nblank_lines = 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Write a line to stdout taking care of space to tab conversion (-h flag)
|
||||
* and character set shifts.
|
||||
*/
|
||||
static void
|
||||
flush_line(LINE *l)
|
||||
{
|
||||
CHAR *c, *endc;
|
||||
int nchars, last_col, this_col;
|
||||
|
||||
last_col = 0;
|
||||
nchars = l->l_line_len;
|
||||
|
||||
if (l->l_needs_sort) {
|
||||
static CHAR *sorted;
|
||||
static int count_size, *count, i, save, sorted_size, tot;
|
||||
|
||||
/*
|
||||
* Do an O(n) sort on l->l_line by column being careful to
|
||||
* preserve the order of characters in the same column.
|
||||
*/
|
||||
if (l->l_lsize > sorted_size) {
|
||||
sorted_size = l->l_lsize;
|
||||
sorted = (CHAR *)xmalloc((void *)sorted,
|
||||
(unsigned)sizeof(CHAR) * sorted_size);
|
||||
}
|
||||
if (l->l_max_col >= count_size) {
|
||||
count_size = l->l_max_col + 1;
|
||||
count = (int *)xmalloc((void *)count,
|
||||
(unsigned)sizeof(int) * count_size);
|
||||
}
|
||||
(void)memset(count, 0, sizeof(int) * l->l_max_col + 1);
|
||||
for (i = nchars, c = l->l_line; --i >= 0; c++)
|
||||
count[c->c_column]++;
|
||||
|
||||
/*
|
||||
* calculate running total (shifted down by 1) to use as
|
||||
* indices into new line.
|
||||
*/
|
||||
for (tot = 0, i = 0; i <= l->l_max_col; i++) {
|
||||
save = count[i];
|
||||
count[i] = tot;
|
||||
tot += save;
|
||||
}
|
||||
|
||||
for (i = nchars, c = l->l_line; --i >= 0; c++)
|
||||
sorted[count[c->c_column]++] = *c;
|
||||
c = sorted;
|
||||
} else
|
||||
c = l->l_line;
|
||||
while (nchars > 0) {
|
||||
this_col = c->c_column;
|
||||
endc = c;
|
||||
do {
|
||||
++endc;
|
||||
} while (--nchars > 0 && this_col == endc->c_column);
|
||||
|
||||
/* if -b only print last character */
|
||||
if (no_backspaces)
|
||||
c = endc - 1;
|
||||
|
||||
if (this_col > last_col) {
|
||||
int nspace = this_col - last_col;
|
||||
|
||||
if (compress_spaces && nspace > 1) {
|
||||
int ntabs;
|
||||
|
||||
ntabs = ((last_col % 8) + nspace) / 8;
|
||||
if (ntabs) {
|
||||
nspace -= (ntabs * 8) - (last_col % 8);
|
||||
while (--ntabs >= 0)
|
||||
PUTC('\t');
|
||||
}
|
||||
}
|
||||
while (--nspace >= 0)
|
||||
PUTC(' ');
|
||||
last_col = this_col;
|
||||
}
|
||||
last_col++;
|
||||
|
||||
for (;;) {
|
||||
if (c->c_set != last_set) {
|
||||
switch (c->c_set) {
|
||||
case CS_NORMAL:
|
||||
PUTC('\017');
|
||||
break;
|
||||
case CS_ALTERNATE:
|
||||
PUTC('\016');
|
||||
}
|
||||
last_set = c->c_set;
|
||||
}
|
||||
PUTC(c->c_char);
|
||||
if (++c >= endc)
|
||||
break;
|
||||
PUTC('\b');
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#define NALLOC 64
|
||||
|
||||
static LINE *line_freelist;
|
||||
|
||||
static LINE *
|
||||
alloc_line(void)
|
||||
{
|
||||
LINE *l;
|
||||
int i;
|
||||
|
||||
if (!line_freelist) {
|
||||
l = (LINE *)xmalloc(NULL, sizeof(LINE) * NALLOC);
|
||||
line_freelist = l;
|
||||
for (i = 1; i < NALLOC; i++, l++)
|
||||
l->l_next = l + 1;
|
||||
l->l_next = NULL;
|
||||
}
|
||||
l = line_freelist;
|
||||
line_freelist = l->l_next;
|
||||
|
||||
(void)memset(l, 0, sizeof(LINE));
|
||||
return (l);
|
||||
}
|
||||
|
||||
static void
|
||||
free_line(LINE *l)
|
||||
{
|
||||
|
||||
l->l_next = line_freelist;
|
||||
line_freelist = l;
|
||||
}
|
||||
|
||||
static void *
|
||||
xmalloc(void *p, size_t size)
|
||||
{
|
||||
void *q;
|
||||
|
||||
if (!(q = (void *)realloc(p, size)))
|
||||
err(EXIT_FAILURE, "realloc");
|
||||
p = q;
|
||||
return (p);
|
||||
}
|
||||
|
||||
static void
|
||||
usage(void)
|
||||
{
|
||||
|
||||
(void)fprintf(stderr, "usage: col [-bfpx] [-l nline]\n");
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
|
||||
static void
|
||||
wrerr(void)
|
||||
{
|
||||
|
||||
(void)fprintf(stderr, "col: write error.\n");
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
|
||||
static void
|
||||
dowarn(int line)
|
||||
{
|
||||
|
||||
warnx("warning: can't back up %s",
|
||||
line < 0 ? "past first line" : "-- line already flushed");
|
||||
}
|
||||
Loading…
Reference in New Issue