Import VX multicall utility and applets

tests/test_cmp.sh

@@ -0,0 +1,60 @@
+#!/bin/sh
+# tests/test_cmp.sh - Tests for cmp applet
+_test_name="cmp"
+. "$(dirname "$0")/harness.sh"
+_srcdir="$(cd "$(dirname "$0")/../src/cmp/tests" && pwd)"
+
+setup_tmpdir
+CMP="$VX cmp"
+
+echo "Running cmp tests..."
+
+# --- basic: identical files ---
+echo "0123456789abcdef" > a
+cp a a_copy
+check_exit "basic: identical files exit 0" 0 $CMP a a_copy
+
+# --- basic: different files ---
+echo "0123456789abcdeg" > b
+check_exit "basic: different files exit 1" 1 $CMP a b
+
+# --- stdin comparison ---
+check_exit "special: cmp a - (stdin identical)" 0 sh -c "$CMP a - < a"
+check_exit "special: cmp - a (stdin identical)" 0 sh -c "$CMP - a < a"
+check_exit "special: cmp a - (stdin different)" 1 sh -c "$CMP a - < b"
+check_exit "special: cmp - a (stdin different)" 1 sh -c "$CMP - a < b"
+
+# --- silent mode ---
+check_exit "silent: -s identical" 0 $CMP -s a a_copy
+check_exit "silent: -s different" 1 $CMP -s a b
+
+# --- byte offset skip ---
+echo -n '1234567890' > skip_a
+echo -n 'abc567890' > skip_b
+check_exit "skip: -i 4:3 matches" 0 $CMP -s -i 4:3 skip_a skip_b
+
+# --- limit (-n) ---
+echo -n "aaaabbbb" > lim_a
+echo -n "aaaaxxxx" > lim_b
+check_exit "limit: -n 4 identical" 0 $CMP -s -n 4 lim_a lim_b
+check_exit "limit: -n 5 different" 1 $CMP -s -n 5 lim_a lim_b
+check_exit "limit: full different" 1 $CMP -s lim_a lim_b
+
+# --- -b flag (print differing bytes) ---
+echo -n "abcd" > a
+echo -n "abdd" > b
+_got="$($CMP -b a b 2>/dev/null)" || true
+_exp="$(cat "$_srcdir/b_flag.out")"
+check_eq "$_got" "$_exp" "bflag: -b output matches"
+
+# --- -bl flags ---
+_got="$($CMP -bl a b 2>/dev/null)" || true
+_exp="$(cat "$_srcdir/bl_flag.out")"
+check_eq "$_got" "$_exp" "blflag: -bl output matches"
+
+# --- nonexistent file ---
+$CMP a NOFILE >/dev/null 2>&1
+_rc=$?
+check_eq "$_rc" "2" "error: nonexistent file exits 2"
+
+summary