From ab193f788e40e3bc214a6c15e3bd5171dd7b163d Mon Sep 17 00:00:00 2001
From: millert <>
Date: Sat, 12 Jan 2002 16:24:35 +0000
Subject: 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(-)

(limited to 'src/lib')

diff --git a/src/lib/libc/stdlib/realpath.c b/src/lib/libc/stdlib/realpath.c
index a6195c1dcb..061f1a7ef1 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;
-- 
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