Avoid usage of PATH_MAX.

Submitted to bug-less@gnu.org.

From ef652341ed8b2c14ac40312ccd4ed329cb69fd0c Mon Sep 17 00:00:00 2001
From: Jan Nieuwenhuizen <janneke@gnu.org>
Date: Sat, 7 Mar 2020 14:57:19 +0100
Subject: [PATCH] Avoid usage of PATH_MAX.

* filename.c (lrealpath): Have realpath allocate the buffer.  Fixes
compilation on the Hurd and avoids possible buffer overflow on other
systems.
---
 filename.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/filename.c b/filename.c
index e420837..faa71b0 100644
--- a/filename.c
+++ b/filename.c
@@ -795,9 +795,9 @@ lrealpath(path)
 	char *path;
 {
 #if HAVE_REALPATH
-	char rpath[PATH_MAX];
-	if (realpath(path, rpath) != NULL)
-		return (save(rpath));
+	char *rpath = NULL;
+	if ((rpath = realpath(path, rpath)) != NULL)
+		return (rpath);
 #endif
 	return (save(path));
 }
-- 
2.24.0

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<div class='path'>path: <a href='/guix/log/?id=1f96da1f49e847fc3b001ae3bfccaba92a08fc6d'>root</a>/<a href='/guix/log/etc?id=1f96da1f49e847fc3b001ae3bfccaba92a08fc6d'>etc</a>/<a href='/guix/log/etc/manifests?id=1f96da1f49e847fc3b001ae3bfccaba92a08fc6d'>manifests</a>/<a href='/guix/log/etc/manifests/ungraft.scm?id=1f96da1f49e847fc3b001ae3bfccaba92a08fc6d'>ungraft.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/etc/manifests/ungraft.scm?id=1f96da1f49e847fc3b001ae3bfccaba92a08fc6d&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2024-12-18 18:32:41 +0100'>2024-12-18</span></td><td><a href='/guix/commit/etc/manifests/ungraft.scm?id=777fde8299d5b0050cae661d403374a7dd87f6ab'>etc: ungraft: Use ‘package-mapping’ directly.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/manifests/ungraft.scm (ungraft): New procedure.
&lt;top-level&gt;: Use it.  Remove ‘ungraft-all’.

Change-Id: I6f1badf06dad9116d4242c7d1fff5ca53e6522f8
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2024-12-12 23:23:34 +0100'>2024-12-12</span></td><td><a href='/guix/commit/etc/manifests/ungraft.scm?id=5e2daf4b10cdbb7b5b3a7b1a49b0dfdba4346748'>maint: Add ungrafting manifest.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/manifests/ungraft.scm: New file.
* Makefile.am (EXTRA_DIST): Add it.

Change-Id: If4aa7649721b93d3297ecd967d5db4a6b71ec6eb
</span></span></td><td>Ludovic Courtès</td></tr>