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#
# Chet Ramey <chet.ramey@case.edu>
#
# Copyright 2002 Chester Ramey
#
# 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.
#
# TThis 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.
#
# substr -- a function to emulate the ancient ksh builtin
#
# -l == remove shortest from left
# -L == remove longest from left
# -r == remove shortest from right (the default)
# -R == remove longest from right
substr()
{
local flag pat str
local usage="usage: substr -lLrR pat string or substr string pat"
local options="l:L:r:R:"
OPTIND=1
while getopts "$options" c
do
case "$c" in
l | L | r | R)
flag="-$c"
pat="$OPTARG"
;;
'?')
echo "$usage"
return 1
;;
esac
done
if [ "$OPTIND" -gt 1 ] ; then
shift $(( $OPTIND -1 ))
fi
if [ "$#" -eq 0 ] || [ "$#" -gt 2 ] ; then
echo "substr: bad argument count"
return 2
fi
str="$1"
#
# We don't want -f, but we don't want to turn it back on if
# we didn't have it already
#
case "$-" in
"*f*")
;;
*)
fng=1
set -f
;;
esac
case "$flag" in
-l)
str="${str#$pat}" # substr -l pat string
;;
-L)
str="${str##$pat}" # substr -L pat string
;;
-r)
str="${str%$pat}" # substr -r pat string
;;
-R)
str="${str%%$pat}" # substr -R pat string
;;
*)
str="${str%$2}" # substr string pat
;;
esac
echo "$str"
#
# If we had file name generation when we started, re-enable it
#
if [ "$fng" = "1" ] ; then
set +f
fi
}
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