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#!/bin/sh
#
# Copyright (c) 2026
# Project Tick. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
set -eu
LC_ALL=C
LANG=C
export LC_ALL LANG
ROOT=$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd)
ECHO_BIN=${ECHO_BIN:-"$ROOT/out/echo"}
TMPDIR=${TMPDIR:-/tmp}
WORKDIR=$(mktemp -d "$TMPDIR/echo-test.XXXXXX")
trap 'rm -rf "$WORKDIR"' EXIT INT TERM
fail() {
printf '%s\n' "FAIL: $1" >&2
exit 1
}
assert_status() {
name=$1
expected=$2
actual=$3
[ "$expected" -eq "$actual" ] || fail "$name: expected exit $expected got $actual"
}
assert_file_eq() {
name=$1
expected_text=$2
actual_file=$3
expected_file=$WORKDIR/expected.$$
printf '%s' "$expected_text" > "$expected_file"
if ! cmp -s "$expected_file" "$actual_file"; then
printf '%s\n' "FAIL: $name" >&2
printf '%s\n' "--- expected ---" >&2
od -An -tx1 -v "$expected_file" >&2
printf '%s\n' "--- actual ---" >&2
od -An -tx1 -v "$actual_file" >&2
exit 1
fi
}
run_case() {
name=$1
expected_status=$2
expected_stdout=$3
expected_stderr=$4
shift 4
stdout_file=$WORKDIR/stdout
stderr_file=$WORKDIR/stderr
if "$ECHO_BIN" "$@" >"$stdout_file" 2>"$stderr_file"; then
status=0
else
status=$?
fi
assert_status "$name status" "$expected_status" "$status"
assert_file_eq "$name stdout" "$expected_stdout" "$stdout_file"
assert_file_eq "$name stderr" "$expected_stderr" "$stderr_file"
}
[ -x "$ECHO_BIN" ] || fail "missing binary: $ECHO_BIN"
run_case "no arguments" 0 "
" ""
run_case "basic output" 0 "hello world
" "" "hello" "world"
run_case "bare -n suppresses newline" 0 "" "" "-n"
run_case "single leading -n" 0 "hello world" "" "-n" "hello" "world"
run_case "second -n is literal" 0 "-n literal" "" "-n" "-n" "literal"
run_case "double hyphen stays literal" 0 "--
" "" "--"
run_case "gnu-style -e stays literal" 0 "-e \t
" "" "-e" "\\t"
run_case "non-final backslash-c stays literal" 0 "left\\c right
" "" "left\\c" "right"
run_case "final backslash-c suppresses newline" 0 "hello" "" "hello\\c"
run_case "empty final backslash-c suppresses newline" 0 "" "" "\\c"
stdout_file=$WORKDIR/write-fail.stdout
stderr_file=$WORKDIR/write-fail.stderr
if (
exec 1>&-
"$ECHO_BIN" "write-test"
) >"$stdout_file" 2>"$stderr_file"; then
status=0
else
status=$?
fi
assert_status "write failure status" 1 "$status"
assert_file_eq "write failure stdout" "" "$stdout_file"
assert_file_eq "write failure stderr" "echo: write: Bad file descriptor
" "$stderr_file"
printf '%s\n' "PASS"
|
