*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 021110-1307, USA.
+ * Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 0211-1301 USA
*
*/
*/
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
#include <ctype.h>
#include <unistd.h>
#include <stdio.h>
return NULL;
}
+static struct mount_option *option_dup(const struct mount_option *option)
+{
+ struct mount_option *new;
+
+ new = malloc(sizeof(*new));
+ if (!new)
+ return NULL;
+
+ new->next = NULL;
+ new->prev = NULL;
+
+ new->keyword = strdup(option->keyword);
+ if (!new->keyword)
+ goto fail;
+
+ new->value = NULL;
+ if (option->value) {
+ new->value = strdup(option->value);
+ if (!new->value) {
+ free(new->keyword);
+ goto fail;
+ }
+ }
+
+ return new;
+
+fail:
+ free(new);
+ return NULL;
+}
+
static void option_destroy(struct mount_option *option)
{
free(option->keyword);
return NULL;
}
+/**
+ * po_dup - duplicate an existing list of options
+ * @options: pointer to mount options
+ *
+ */
+struct mount_options *po_dup(struct mount_options *source)
+{
+ struct mount_options *target;
+ struct mount_option *current;
+
+ if (!source)
+ return NULL;
+
+ target = options_create();
+ if (options_empty(source) || target == NULL)
+ return target;
+
+ current = source->head;
+ while (target->count < source->count) {
+ struct mount_option *option;
+
+ option = option_dup(current);
+ if (!option) {
+ po_destroy(target);
+ return NULL;
+ }
+
+ options_tail_insert(target, option);
+ current = current->next;
+ }
+
+ return target;
+}
+
/**
* po_replace - replace mount options in one mount_options object with another
* @target: pointer to previously instantiated object to replace
}
/**
- * po_rightmost - determine the relative position of two options
+ * po_get_numeric - return numeric value of rightmost instance of keyword option
+ * @options: pointer to mount options
+ * @keyword: pointer to a C string containing option keyword for which to search
+ * @value: OUT: set to the value of the keyword
+ *
+ * This is specifically for parsing keyword options that take only a numeric
+ * value. If multiple instances of the same option are present in a mount
+ * option list, the rightmost instance is always the effective one.
+ *
+ * Returns:
+ * * PO_FOUND if the keyword was found and the value is numeric; @value is
+ * set to the keyword's value
+ * * PO_NOT_FOUND if the keyword was not found
+ * * PO_BAD_VALUE if the keyword was found, but the value is not numeric
+ *
+ * These last two are separate in case the caller wants to warn about bad mount
+ * options instead of silently using a default.
+ */
+#ifdef HAVE_STRTOL
+po_found_t po_get_numeric(struct mount_options *options, char *keyword, long *value)
+{
+ char *option, *endptr;
+ long tmp;
+
+ option = po_get(options, keyword);
+ if (option == NULL)
+ return PO_NOT_FOUND;
+
+ errno = 0;
+ tmp = strtol(option, &endptr, 10);
+ if (errno == 0 && endptr != option) {
+ *value = tmp;
+ return PO_FOUND;
+ }
+ return PO_BAD_VALUE;
+}
+#else /* HAVE_STRTOL */
+po_found_t po_get_numeric(struct mount_options *options, char *keyword, long *value)
+{
+ char *option;
+
+ option = po_get(options, keyword);
+ if (option == NULL)
+ return PO_NOT_FOUND;
+
+ *value = atoi(option);
+ return PO_FOUND;
+}
+#endif /* HAVE_STRTOL */
+
+/**
+ * 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;
+ 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;
}
/**