[PATCH] sed: fix handling of symlinks pointing to path with 128 chars

[Hauke Mehrtens]

* sed/utils.c:
(follow_symlink): Expand buf if buf_used == buf_size to call readlink on
path of len(path) == SSIZE_IDX_MAX too.
---
 NEWS        | 3 +++
 sed/utils.c | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/NEWS b/NEWS
index c6adcda..95c64f5 100644
--- a/NEWS
+++ b/NEWS
@@ -2,6 +2,9 @@ GNU sed NEWS                                    -*- outline -*-
 
 * Noteworthy changes in release ?.? (????-??-??) [?]
 
+** Bug fixes
+  'sed --follow-symlinks -i' works again on symlinks of 128 characters.
+  [bug introduced in sed 4.9]
 
 * Noteworthy changes in release 4.9 (2022-11-06) [stable]
 
diff --git a/sed/utils.c b/sed/utils.c
index 4bd6587..905c96a 100644
--- a/sed/utils.c
+++ b/sed/utils.c
@@ -344,7 +344,7 @@ follow_symlink (const char *fname)
       /* Put symlink contents into BUF + BUF_USED.  */
       while ((linklen = (buf_used < buf_size
                          ? readlink (fn, buf + buf_used, buf_size - buf_used)
-                         : 0))
+                         : buf_size))
              == buf_size)
         {
           buf = xpalloc (buf, &buf_size, 1, SSIZE_IDX_MAX, 1);
-- 
2.35.1