char buf[sizeof("arg")-1 + 2 + sizeof("-dot-prefix")];
snprintf(buf, sizeof(buf), "arg%u-dot-prefix", c->type - BUS_MATCH_ARG_NAMESPACE);
char buf[sizeof("arg")-1 + 2 + sizeof("-dot-prefix")];
snprintf(buf, sizeof(buf), "arg%u-dot-prefix", c->type - BUS_MATCH_ARG_NAMESPACE);