diff options
| -rw-r--r-- | lib/if.c | 12 |
1 files changed, 11 insertions, 1 deletions
@@ -46,7 +46,14 @@ struct if_master int (*if_delete_hook) (struct interface *); } if_master; -/* Compare interface names */ +/* Compare interface names, returning an integer greater than, equal to, or + * less than 0, (following the strcmp convention), according to the + * relationship between ifp1 and ifp2. Interface names consist of an + * alphabetic prefix and a numeric suffix. The primary sort key is + * lexicographic by name, and then numeric by number. No number sorts + * before all numbers. Examples: de0 < de1, de100 < fxp0 < xl0, devpty < + * devpty0, de0 < del0 + */ int if_cmp_func (struct interface *ifp1, struct interface *ifp2) { @@ -67,6 +74,9 @@ if_cmp_func (struct interface *ifp1, struct interface *ifp2) if (l1 != l2) return (strcmp(p1, p2)); + /* Note that this relies on all numbers being less than all letters, so + * that de0 < del0. + */ res = strncmp(p1, p2, l1); /* names are different -> compare them */ |