#endif /* HAVE_STRTOL */
/**
- * po_rightmost - determine the relative position of two options
+ * po_rightmost - determine the relative position of several options
* @options: pointer to mount options
- * @key1: pointer to a C string containing an option keyword
- * @key2: pointer to a C string containing another option keyword
+ * @keys: pointer to an array of C strings containing option keywords
+ *
+ * This function can be used to determine which of several similar
+ * options will be the one to take effect.
*
* The kernel parses the mount option string from left to right.
* If an option is specified more than once (for example, "intr"
* and "nointr", the rightmost option is the last to be parsed,
* and it therefore takes precedence over previous similar options.
*
- * This function can be used to determine which of two similar
- * options will be the one to take effect.
+ * This can also distinguish among multiple synonymous options, such
+ * as "proto=," "udp" and "tcp."
+ *
+ * Returns the index into @keys of the option that is rightmost.
+ * If none of the options listed in @keys is present in @options, or
+ * if @options is NULL, returns -1.
*/
-po_rightmost_t po_rightmost(struct mount_options *options,
- char *key1, char *key2)
+int po_rightmost(struct mount_options *options, const char *keys[])
{
struct mount_option *option;
+ unsigned int i;
if (options) {
for (option = options->tail; option; option = option->prev) {
- if (key2 && strcmp(option->keyword, key2) == 0)
- return PO_KEY2_RIGHTMOST;
- if (key1 && strcmp(option->keyword, key1) == 0)
- return PO_KEY1_RIGHTMOST;
+ for (i = 0; keys[i] != NULL; i++)
+ if (strcmp(option->keyword, keys[i]) == 0)
+ return i;
}
}
- return PO_NEITHER_FOUND;
+ return -1;
}
/**