zmore.in

gzip源码

:
#!/bin/sh

# Copyright (C) 2001 Free Software Foundation
# Copyright (C) 1992, 1993 Jean-loup Gailly

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.

PATH="BINDIR:$PATH"; export PATH
if test "`echo -n a`" = "-n a"; then
  # looks like a SysV system:
  n1=''; n2='\c'
else
  n1='-n'; n2=''
fi
oldtty=`stty -g 2>/dev/null`
if stty -cbreak 2>/dev/null; then
  cb='cbreak'; ncb='-cbreak'
else
  # 'stty min 1' resets eof to ^a on both SunOS and SysV!
  cb='min 1 -icanon'; ncb='icanon eof ^d'
fi
if test $? -eq 0 -a -n "$oldtty"; then
   trap 'stty $oldtty 2>/dev/null; exit' 0 2 3 5 10 13 15
else
   trap 'stty $ncb echo 2>/dev/null; exit' 0 2 3 5 10 13 15
fi

if test $# = 0; then
    if test -t 0; then
	echo usage: zmore files...
    else
	gzip -cdfq | eval ${PAGER-more}
    fi
else
    FIRST=1
    for FILE
    do
	< "$FILE" || continue
	if test $FIRST -eq 0; then
		echo $n1 "--More--(Next file: $FILE)$n2"
		stty $cb -echo 2>/dev/null
		ANS=`dd bs=1 count=1 2>/dev/null` 
		stty $ncb echo 2>/dev/null
		echo " "
		if test "$ANS" = 'e' -o "$ANS" = 'q'; then
			exit
		fi
	fi
	if test "$ANS" != 's'; then
		echo "------> $FILE <------"
		gzip -cdfq "$FILE" | eval ${PAGER-more}
	fi
	if test -t; then
		FIRST=0
	fi
    done
fi