static int drive_add(const char *file, const char *fmt, ...) { va_list ap; int index = drive_opt_get_free_idx(); if (nb_drives_opt >= MAX_DRIVES || index == -1) { fprintf(stderr, "qemu: too many drives\n"); exit(1); } drives_opt[index].file = file; va_start(ap, fmt); vsnprintf(drives_opt[index].opt, sizeof(drives_opt[0].opt), fmt, ap); va_end(ap); nb_drives_opt++; return index; }