[src/trunk]: src/lib/libc/gen HACK: if calling dirname() with the results o...

[kre <kre%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/b1b3656dd757
branches:  trunk
changeset: 836108:b1b3656dd757
user:      kre <kre%NetBSD.org@localhost>
date:      Thu Sep 27 00:45:34 2018 +0000

description:
HACK:   if calling dirname() with the results of a previous dirname()
there is no need to copy the path into the output buffer, it is already
there....

All this has to change to become compat with a forthcoming POSIX update.

diffstat:

 lib/libc/gen/dirname.c |  7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diffs (28 lines):

diff -r 24a067677b6e -r b1b3656dd757 lib/libc/gen/dirname.c
--- a/lib/libc/gen/dirname.c    Wed Sep 26 22:33:35 2018 +0000
+++ b/lib/libc/gen/dirname.c    Thu Sep 27 00:45:34 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: dirname.c,v 1.13 2014/07/16 10:52:26 christos Exp $    */
+/*     $NetBSD: dirname.c,v 1.14 2018/09/27 00:45:34 kre Exp $ */
 
 /*-
  * Copyright (c) 1997, 2002 The NetBSD Foundation, Inc.
@@ -31,7 +31,7 @@
 
 #include <sys/cdefs.h>
 #if defined(LIBC_SCCS) && !defined(lint)
-__RCSID("$NetBSD: dirname.c,v 1.13 2014/07/16 10:52:26 christos Exp $");
+__RCSID("$NetBSD: dirname.c,v 1.14 2018/09/27 00:45:34 kre Exp $");
 #endif /* !LIBC_SCCS && !lint */
 
 #include "namespace.h"
@@ -83,7 +83,8 @@
 out:
        if (buf != NULL && buflen != 0) {
                buflen = MIN(len, buflen - 1);
-               memcpy(buf, path, buflen);
+               if (buf != path)
+                       memcpy(buf, path, buflen);
                buf[buflen] = '\0';
        }
        return len;