From 9f759cc72014ab66da0e14318d4aa0c72e9311d9 Mon Sep 17 00:00:00 2001
From: Takashi Kusumi <tkusumi@zlab.co.jp>
Date: Fri, 5 Apr 2024 12:03:42 +0900
Subject: [PATCH] sort: fix performance issue on zero-sized pseudo files

Previously, an insufficient buffer size was chosen for zero-sized pseudo
files (e.g., /proc/kallsyms). Now, the buffer size is calculated using
INPUT_FILE_SIZE_GUESS when the file size is zero.
---
 src/sort.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/sort.c b/src/sort.c
index 329ed45dc..8d757da55 100644
--- a/src/sort.c
+++ b/src/sort.c
@@ -1538,7 +1538,7 @@ sort_buffer_size (FILE *const *fps, size_t nfps,
           != 0)
         sort_die (_("stat failed"), files[i]);
 
-      if (S_ISREG (st.st_mode))
+      if (S_ISREG (st.st_mode) && st.st_size != 0)
         file_size = st.st_size;
       else
         {
-- 
2.41.0