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# Utility functions for working with columns in output of tools.
# Columns have a header. The header fields are separated by at least two spaces.
# These functions expect output like:
# <<
# Model: ATA TOSHIBA MK1652GS (scsi)
# Disk /dev/sda: 160GB
# Sector size (logical/physical): 512B/512B
# Partition Table: msdos
#
# Number Start End Size Type File system Flags
# 1 32.3kB 98.7MB 98.7MB primary ext3 boot
# 2 98.7MB 140GB 140GB primary lvm
# >>
set_separator() {
OIFS=$IFS
IFS="$1"
}
restore_separator() {
IFS=$OIFS
}
columns=
# produces a list of header=end pairs in $columns
init_columns() {
local line=$1
columns=""
local word=""
local wasspace=""
local len=${#line}
local i=0
while (( $i < $len )) ;
do
local char="${line:$i:1}"
if [[ "$wasspace" ]] && [[ "$char" = " " ]] ;then
if [[ "$word" ]] ; then
# word complete, write to list
let start=$i-${#word}
word=$( echo "$word" | tr '[:upper:]' '[:lower:]')
columns+="${word%% }=$start;"
word=""
fi
else
word="${word}${char}"
fi
if [[ "$char" = " " ]] ; then
wasspace="yes"
else
wasspace=""
fi
let i++
done
# last word
let start=$i-${#word}
word=$( echo "$word"| tr '[:upper:]' '[:lower:]')
columns+="${word%% }=$start;"
#echo "c:$columns"
}
# get_column_size $header
get_column_size() {
local start=$(get_column_start "$1")
local nextheader=$(get_next_header "$1")
if [[ -z "$nextheader" ]] ; then
echo "255"
return 0
fi
local end=$(get_column_start "$nextheader")
let local size=$end-$start
echo "$size"
}
# get_column_start $header
get_column_start() {
local pair
set_separator ";"
for pair in $columns ; do
local header=${pair%=*}
local hstart=${pair#*=}
if [[ "$header" = "$1" ]] ; then
echo "$hstart"
restore_separator
return 0
fi
done
restore_separator
return 1
}
# get_next_header $header
get_next_header() {
local pair
local previous
set_separator ";"
for pair in $columns ; do
local header=${pair%=*}
local hstart=${pair#*=}
if [[ "$previous" = "$1" ]] ; then
echo "$header"
restore_separator
return 0
fi
previous=$header
done
restore_separator
return 1
}
# get_columns $line $header1 $header2
# print the contents of the columns, separated by ;
get_columns() {
local line=$1
shift
local headers=$@
local value=""
for header in $headers ; do
local start=$(get_column_start "$header")
local size=$(get_column_size "$header")
#echo "$header $start $size"
value+="${line:$start:$size};"
done
echo "$value"
}