#!/bin/bash

usage() {
    echo "usage: sztest [-hab] [-H SYS-HEADER] [-L LOCAL-HEADER] TYPE [CCFLAGS...]"
}

mode=size
sheaders=
lheaders=
while [ "${1:0:1}" = "-" ]; do
    opt="$1"
    shift
    case "$opt" in
	"-h")
	    usage
	    exit 0
	    ;;
	"-a")
	    mode=align
	    ;;
	"-b")
	    mode=both
	    ;;
	"-H")
	    sheaders="$sheaders $1"
	    shift
	    ;;
	"-L")
	    lheaders="$lheaders $1"
	    shift
	    ;;
    esac
done
if [ $# -lt 1 ]; then
    usage >&2
    exit 1
fi
type="$1"
shift
file="$(mktemp /tmp/sztestXXXXXX)"
cat >"$file.c" <<EOF
#include <stdio.h>
#include <stdint.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/stat.h>
EOF
for header in $sheaders; do
    echo "#include <$header>" >>"$file.c"
done
for header in $lheaders; do
    echo "#include \"$header\"" >>"$file.c"
done
cat >>"$file.c" <<EOF
int main(int argc, char **argv)
{
EOF
case "$mode" in
    size)
	echo "    printf(\"%zi\\n\", sizeof($type));" >>"$file.c"
	;;
    align)
	echo "    printf(\"%zi\\n\", __alignof__($type));" >>"$file.c"
	;;
    both)
	echo "    printf(\"%zi %zi\\n\", sizeof($type), __alignof__($type));" >>"$file.c"
	;;
esac
cat >>"$file.c" <<EOF
    return(0);
}
EOF

if ! gcc "$@" -iquote. -g -Wall -o "$file" "$file.c"; then
    rm -f "$file" "$file.c"
    exit 1
fi
"$file"
rm "$file" "$file.c"