tests/od/od-endian.sh

   1 #!/bin/sh
   2 # verify that od --endian works properly
   3
   4 # Copyright (C) 2014-2024 Free Software Foundation, Inc.
   5
   6 # This program is free software: you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation, either version 3 of the License, or
   9 # (at your option) any later version.
  10
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
  18
  19 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
  20 print_ver_ od
  21
  22 in='0123456789abcdef'
  23
  24 NL='
  25 '
  26
  27 # rev(1) is not generally available, so here's a simplistic
  28 # implementation sufficient for our purposes.
  29 rev() {
  30   while read line; do
  31     printf '%s' "$line" | sed "s/./&\\$NL/g" | tac | paste -s -d ''
  32   done
  33 }
  34
  35 in_swapped() { printf '%s' "$in" | sed "s/.\{$1\}/&\\$NL/g" | rev |tr -d '\n'; }
  36
  37 for e in little big; do
  38   test $e = little && eo=big || eo=little
  39   for s in 1 2 4 8 16; do
  40     for t in x f; do
  41       od -t $t$s --endian=$e /dev/null > /dev/null 2>&1 || continue
  42       printf '%s' "$in" | od -An -t $t$s --endian=$e  > out1
  43       in_swapped  "$s"  | od -An -t $t$s --endian=$eo > out2
  44       compare out1 out2 || fail=1
  45     done
  46   done
  47 done
  48
  49 Exit $fail