#!/bin/bash
# Verify that trying to process a nonexistent file results in failure.

if [[ $# != 1 ]]; then
   echo "$0 <split_png.exe>"
   exit 1
fi

SPLITTER=$1
MSG=$(mktemp -p .)
OUTPUT1=$(mktemp -p .)
OUTPUT2=$(mktemp -p .)

# Disable leak checking for ASAN, since we intentionally don't free memory.
export ASAN_OPTIONS=detect_leaks=0

function die
{
   echo "$1"
   rm -f "$MSG" "$OUTPUT1" "$OUTPUT2"
   exit 1
}

# Check exit status.
if ( "./$SPLITTER" nonexistent_file.png "$OUTPUT1" "$OUTPUT2" > "$MSG" ); then
   die "$LINENO: Unexpected success."
fi

# Check error message.
if ! ( grep -qF "nonexistent_file.png" "$MSG" ); then
   die "$LINENO: Did not identify failing input."
fi
if ! ( grep -qiF "read" "$MSG" ); then
   die "$LINENO: Did not identify failing operation."
fi

# Verify that we didn't try to write anything.
#
# mktemp would have created empty temporary files, here we check that
# they are still empty.
if [[ -s "$OUTPUT1" ]]; then
   die "$LINENO: Unexpected output file $OUTPUT1"
fi
if [[ -s "$OUTPUT2" ]]; then
   die "$LINENO: Unexpected output file $OUTPUT2"
fi

# Success, cleanup and exit quietly.
rm -f "$MSG" "$OUTPUT1" "$OUTPUT2"
exit 0