From 3a0391a9a1a6946eb58c723630f29f760f122bc9 Mon Sep 17 00:00:00 2001 From: paul Date: Sat, 17 Jul 2004 11:51:29 +0000 Subject: 2004-07-17 Paul Jakma * if.c: (if_cmp_func) Add comment suggested by Greg Troxel. --- lib/if.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) (limited to 'lib') diff --git a/lib/if.c b/lib/if.c index 2e36eff3..d80e2347 100644 --- a/lib/if.c +++ b/lib/if.c @@ -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 */ -- cgit v1.2.1