#!/bin/sh
# This would malfunction in diff-3.4

. "${srcdir=.}/init.sh"; path_prepend_ ../src

# Some systems lack seq.
# A limited replacement for seq: handle 1 or 2 args; increment must be 1
seq()
{
  case $# in
    1) start=1  final=$1;;
    2) start=$1 final=$2;;
    *) echo you lose 1>&2; exit 1;;
  esac
  awk 'BEGIN{for(i='$start';i<='$final';i++) print i}' < /dev/null
}

echo a > a || framework_failure_
echo b > b || framework_failure_
echo c > c || framework_failure_
cat <<'EOF' > exp || framework_failure_
====
1:1c
  a
2:1c
  b
3:1c
  c
EOF

fail=0

diff3 a b c > out 2> err || fail=1
compare exp out || fail=1
compare /dev/null err || fail=1

# Repeat, but with all three files the same:
diff3 a a a > out 2> err || fail=1
compare /dev/null out || fail=1
compare /dev/null err || fail=1

# This would have provoked a nontrivial leak prior to diffutils-3.5,
# due to the nontrivial list of diff_block structs.
seq 10 40|sed 's/1$/x/' > d || framework_failure_
seq 10 40|sed 's/5$/y/' > e || framework_failure_
seq 10 40|sed 's/8$/z/' > f || framework_failure_
cat <<'EOF' > exp40 || framework_failure_
====1
1:2c
  1x
2:2c
3:2c
  11
====2
1:6c
3:6c
  15
2:6c
  1y
====3
1:9c
2:9c
  18
3:9c
  1z
====1
1:12c
  2x
2:12c
3:12c
  21
====2
1:16c
3:16c
  25
2:16c
  2y
====3
1:19c
2:19c
  28
3:19c
  2z
====1
1:22c
  3x
2:22c
3:22c
  31
====2
1:26c
3:26c
  35
2:26c
  3y
====3
1:29c
2:29c
  38
3:29c
  3z
EOF

diff3 d e f > out 2> err
compare exp40 out || fail=1
compare /dev/null err || fail=1

Exit $fail