Add support for "find ... -exec foo {} \+".

From the manpage:

If terminated by a plus sign (``+''), the pathnames for which the
primary is evaluated are aggregated into sets, and utility will
be invoked once per set, similar to xargs(1).  If any invocation
exits with non-zero exit status, then find will eventually do so
as well, but this does not cause find to exit early.  The string
``{}'' must appear, and must appear last.  Each set is limited to
no more than 5,000 pathnames, and is also limited such that the
invocation of utility does not exceed ARG_MAX.

Code comes from NetBSD, written by John Hawkinson.  Tested by eivinde at
terraplane dot org and myself for quite some time.

ok miod@

1 files changed, 3 insertions, 1 deletions

diff --git a/usr.bin/find/extern.h b/usr.bin/find/extern.h
index 737436b5932..476ea0fecc4 100644
--- a/usr.bin/find/extern.h
+++ b/usr.bin/find/extern.h
@@ -1,4 +1,4 @@
-/* *      $OpenBSD: extern.h,v 1.16 2011/04/21 01:14:21 jacekm Exp $*/
+/* *      $OpenBSD: extern.h,v 1.17 2012/01/02 23:19:45 pascal Exp $*/
 /*-
  * Copyright (c) 1991, 1993
  *	The Regents of the University of California.  All rights reserved.
@@ -37,10 +37,12 @@ void	*emalloc(unsigned int);
 PLAN	*find_create(char ***);
 int	 find_execute(PLAN *, char **);
 PLAN	*find_formplan(char **);
+int	find_traverse(PLAN *, int (*)(PLAN *, void *), void *);
 PLAN	*not_squish(PLAN *);
 OPTION	*option(char *);
 PLAN	*or_squish(PLAN *);
 PLAN	*paren_squish(PLAN *);
+int	plan_cleanup(PLAN *, void *);
 struct stat;
 void	 printlong(char *, char *, struct stat *);
 int	 queryuser(char **);