[src/trunk]: src/usr.bin/realpath If it isn't possible to determine the realp...

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

details:   https://anonhg.NetBSD.org/src/rev/81c4dabd77ff
branches:  trunk
changeset: 376003:81c4dabd77ff
user:      kre <kre%NetBSD.org@localhost>
date:      Thu May 25 17:24:17 2023 +0000

description:
If it isn't possible to determine the realpath() of ".", then simply
give up on attempting to resolve any relative path - there's no hope.

diffstat:

 usr.bin/realpath/realpath.c |  8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diffs (29 lines):

diff -r cac374840363 -r 81c4dabd77ff usr.bin/realpath/realpath.c
--- a/usr.bin/realpath/realpath.c       Thu May 25 17:20:14 2023 +0000
+++ b/usr.bin/realpath/realpath.c       Thu May 25 17:24:17 2023 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: realpath.c,v 1.2 2022/07/21 09:47:31 kre Exp $ */
+/*     $NetBSD: realpath.c,v 1.3 2023/05/25 17:24:17 kre Exp $ */
 /*-
  * SPDX-License-Identifier: BSD-3-Clause
  *
@@ -35,7 +35,7 @@
 #if 0
 __FBSDID("$FreeBSD: head/bin/realpath/realpath.c 326025 2017-11-20 19:49:47Z pfg $");
 #else
-__RCSID("$NetBSD: realpath.c,v 1.2 2022/07/21 09:47:31 kre Exp $");
+__RCSID("$NetBSD: realpath.c,v 1.3 2023/05/25 17:24:17 kre Exp $");
 #endif
 #endif /* not lint */
 
@@ -132,6 +132,10 @@ process(char *path)
 
        if (p == NULL) {
                p = realpath(".", buf);
+               if (p == NULL) {
+                       warnx("relative path; current location unknown");
+                       return false;
+               }
                if ((size_t)snprintf(buf2, sizeof buf2, "%s/%s", buf, path)
                    >= sizeof buf2) {
                        if (!qflag)