sizeof

#!/bin/sh

usage()
{
    cat >&2 <<__EOF__
Usage: $(basename $0) < type1 > < type2 > ...

Options:
  type          -- The name of a C type, e.g. size_t.
__EOF__

    exit ${1-1}
}

log()
{
    echo "$(basename $0): $1" >&2
}

if [ $# -eq 0 ]; then
    usage
fi

if which clang >/dev/null 2>&1; then
    CC=clang
else
    CC=gcc
fi

trap 'rm -f $CFILE $OFILE; exit 0' SIGHUP SIGINT SIGTERM EXIT

CFILE=$(mktemp -t $(basename $0))
OFILE=$(mktemp -t $(basename $0))
if [ -z "$CFILE" -o -z "$OFILE" ]; then
    log "Failed to create temporary file. Exiting."
    exit 1
fi

# XXX try to dynamically figure out where the defn/typedef for the type is
# by searching through headers in /usr/include and /usr/local/include
cat >> $CFILE <<__EOF__
#include <sys/types.h>
#include <sys/stat.h>

#include <fcntl.h>
#include <regex.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int
main(int argc, char **argv)
{

__EOF__

while [ $# -gt 0 ]; do
    printf '\tprintf("%s: %%zd\\n", sizeof(%s));\n' "$1" "$1" >> $CFILE
    shift
done

cat >> $CFILE <<__EOF__
        return (0);
}
__EOF__

if ! $CC -x c -o $OFILE $CFILE; then
    log "failed to compile test program $CFILE:"
    echo '--'
    cat $CFILE | sed 's/^/  /'
    echo '--'
    exit 1
fi

$OFILE