From: Paul Eggert <eggert@cs.ucla.edu>
Date: Wed, 23 Jul 2025 05:05:17 +0000 (-0700)
Subject: tail: simplify -c+ on regular files
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c667ca229f3bed2b6d2ea16312f607d8d385e4c3;p=thirdparty%2Fcoreutils.git

tail: simplify -c+ on regular files

* src/tail.c (tail_bytes): Simplify the -c+N case by treating
regular files like other files; if the lseek fails for whatever
reason, fall back on the unoptimized version instead of reporting
a fatal error.
---

diff --git a/src/tail.c b/src/tail.c
index ac66c9aa50..caf67a0500 100644
--- a/src/tail.c
+++ b/src/tail.c
@@ -1858,9 +1858,7 @@ tail_bytes (char const *pretty_filename, int fd, uintmax_t n_bytes,
   if (from_start)
     {
       if (! presume_input_pipe && n_bytes <= OFF_T_MAX
-          && ((S_ISREG (stats.st_mode)
-               && xlseek (fd, n_bytes, SEEK_CUR, pretty_filename) >= 0)
-              || lseek (fd, n_bytes, SEEK_CUR) != -1))
+          && 0 <= lseek (fd, n_bytes, SEEK_CUR))
         *read_pos += n_bytes;
       else
         {