Function mount_argf

freebsd/kern/vfs_mount.c:2315–2352

* Add an argument printf style */

 * Add an argument printf style
 */
struct mntarg *
mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...)
{
	va_list ap;
	struct mntaarg *maa;
	struct sbuf *sb;
	int len;

	if (ma == NULL) {
		ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
		SLIST_INIT(&ma->list);
	}
	if (ma->error)
		return (ma);

	ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
	    M_MOUNT, M_WAITOK);
	ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
	ma->v[ma->len].iov_len = strlen(name) + 1;
	ma->len++;

	sb = sbuf_new_auto();
	va_start(ap, fmt);
	sbuf_vprintf(sb, fmt, ap);
	va_end(ap);
	sbuf_finish(sb);
	len = sbuf_len(sb) + 1;
	maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO);
	SLIST_INSERT_HEAD(&ma->list, maa, next);
	bcopy(sbuf_data(sb), maa + 1, len);
	sbuf_delete(sb);

	ma->v[ma->len].iov_base = maa + 1;
	ma->v[ma->len].iov_len = len;
	ma->len++;

	return (ma);
}

/*
 * Add an argument which is a userland string.