add a GLOB_KEEPSTAT option that retains a copy of the struct stat

information that is looked up while matching glob(3)s
Keeping this information around can make a big difference when
fetching it is expensive, e.g. in sftp which uses GLOB_ALTDIRFUNC
feedback millert@ jmc@
"get it in before the libc crank" deraadt@

src/include/glob.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: glob.h,v 1.10 2005/12/13 00:35:22 millert Exp $	*/
+/*	$OpenBSD: glob.h,v 1.11 2010/09/24 13:32:55 djm Exp $	*/
 /*	$NetBSD: glob.h,v 1.5 1994/10/26 00:55:56 cgd Exp $	*/
 
 /*
@@ -39,6 +39,7 @@
 #define	_GLOB_H_
 
 #include <sys/cdefs.h>
+#include <sys/stat.h>
 
 struct stat;
 typedef struct {
@@ -47,6 +48,7 @@ typedef struct {
 	int gl_offs;		/* Reserved at beginning of gl_pathv. */
 	int gl_flags;		/* Copy of flags parameter to glob. */
 	char **gl_pathv;	/* List of paths matching pattern. */
+	struct stat **gl_statv;	/* Stat entries corresponding to gl_pathv */
 				/* Copy of errfunc parameter to glob. */
 	int (*gl_errfunc)(const char *, int);
 
@@ -83,6 +85,7 @@ typedef struct {
 #define	GLOB_QUOTE	0x0400	/* Quote special chars with \. */
 #define	GLOB_TILDE	0x0800	/* Expand tilde names from the passwd file. */
 #define GLOB_LIMIT	0x2000	/* Limit pattern match output to ARG_MAX */
+#define	GLOB_KEEPSTAT	0x4000	/* Retain stat data for paths in gl_statv. */
 #define GLOB_ABEND	GLOB_ABORTED /* backward compatibility */
 #endif