From b6c954318e95c8bc27fc27f6703c67be625b0ee4 Mon Sep 17 00:00:00 2001
From: millert <>
Date: Sat, 12 Jan 2002 16:24:35 +0000
Subject: [PATCH] If the user passes in "" as the string to resolve the lstat()
 will fail anyway so check for that.  Also convert "." to "" since that way we
 avoid the lstat() (which we don't need) and the subsequent chdir() and some
 dir checks.

---
 src/lib/libc/stdlib/realpath.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/lib/libc/stdlib/realpath.c b/src/lib/libc/stdlib/realpath.c
index a6195c1d..061f1a7e 100644
--- a/src/lib/libc/stdlib/realpath.c
+++ b/src/lib/libc/stdlib/realpath.c
@@ -35,7 +35,7 @@
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static char *rcsid = "$OpenBSD: realpath.c,v 1.5 2001/06/27 00:58:56 lebel Exp $";
+static char *rcsid = "$OpenBSD: realpath.c,v 1.6 2002/01/12 16:24:35 millert Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #include <sys/param.h>
@@ -70,6 +70,10 @@ realpath(path, resolved)
 		return (NULL);
 	}
 
+	/* Convert "." -> "" to optimize away a needless lstat() and chdir() */
+	if (path[0] == '.' && path[1] == '\0')
+		path = "";
+
 	/*
 	 * Find the dirname and basename from the path to be resolved.
 	 * Change directory to the dirname component.
@@ -98,7 +102,7 @@ loop:
 		p = resolved;
 
 	/* Deal with the last component. */
-	if (lstat(p, &sb) == 0) {
+	if (*p != '\0' && lstat(p, &sb) == 0) {
 		if (S_ISLNK(sb.st_mode)) {
 			if (++symlinks > MAXSYMLINKS) {
 				errno = ELOOP;