Function mount_arg

freebsd/kern/vfs_mount.c:2383–2407

* Plain argument. * * If length is -1, treat value as a C string. */

 * If length is -1, treat value as a C string.
 */
struct mntarg *
mount_arg(struct mntarg *ma, const char *name, const void *val, 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++;

	ma->v[ma->len].iov_base = (void *)(uintptr_t)val;
	if (len < 0)
		ma->v[ma->len].iov_len = strlen(val) + 1;
	else
		ma->v[ma->len].iov_len = len;
	ma->len++;
	return (ma);
}

/*
 * Free a mntarg structure