#!/bin/bash
# Author: Iain Douglas <centos@1n6.org.uk>

# Tests for cmp

function ExitFail {
    t_Log "FAIL"
    exit $FAIL
}
# Basic Tests

t_Log "Running $0 - cmp tests"

t_Log "Basic Check"
cmp -v &>/dev/null || ExitFail

FILE=/var/tmp/diffutils
# Cleanup just in case we exited without doing so earlier.
rm ${FILE}a ${FILE}b &>/dev/null

# Create some files to work with
cat << EOF >${FILE}a
This is some text to play with
EOF

cat << EOF >${FILE}b
This is some test to play with
EOF

# Basic check of 2 files
t_Log "Compare 2 files"
cmp ${FILE}a ${FILE}b | grep -q "byte 16, line 1" || ExitFail

t_Log "Compare 2 files -b"
cmp -b ${FILE}a ${FILE}b | grep -q " line 1 is 170 x 163 s" || ExitFail
t_Log "Check -i - skip bytes "

# Expect this to pass as the difference is at byte 16 
cmp -b -i 16 ${FILE}a ${FILE}b || ExitFail

t_Log "check -i skip1:skip2"
 
# Expect this to have a different output to earlier 
cmp -i 15:16 ${FILE}a ${FILE}b | grep -q "byte 1, line 1"|| ExitFail

# Chek that -n works 
t_Log "Check -n limit bytes"
cmp -n 15 ${FILE}a ${FILE}b || ExitFail

# Verbose output
t_Log "Check -l - verbose output"
cmp -l ${FILE}a ${FILE}b | grep -q "16 170 163" || ExitFail

# Silent - exit status only, first scheck that there is no output
t_Log "Check -s - silent mode"
cmp -s ${FILE}a ${FILE}b | wc -m | grep -q "^0" || ExitFail
cmp -i 16 -s ${FILE}a ${FILE}b 
t_CheckExitStatus $?

rm ${FILE}a ${FILE}b &>/dev/null