sizeof -- sizeof a C struct

sizeof.sh

#!/bin/sh --
# sizeof STRUCT [HEADER...]
set -ue
if [ "$#" = 0 ];then
	cat >&2 <<-EOF
		USAGE: sizeof STRUCT [HEADER...]
		EXAMPLE: sizeof stat sys/stat.h
	EOF
	exit 1
fi
s=$1
shift
for t in struct union enum;do
	{
	printf '#include <%s>\n' "$@" stdio.h
	printf 'int main(){printf("%%zu\\n",sizeof(struct %s));}' "$s"
	} | tcc -run - 2>/dev/null && exit || :
done
{
printf '#include <%s>\n' "$@" stdio.h
printf 'int main(){printf("%%zu\\n",sizeof(%s));}' "$s"
} | tcc -run - || {
	printf 'sizeof: %s: Unknown type\n' "$s"
	printf 'sizeof: check headers and type name\n'
}