From 556cdce5c8a92c0fbb1d6d829edb28299b43c6e8 Mon Sep 17 00:00:00 2001
From: Jim Meyering <jim@meyering.net>
Date: Fri, 6 May 1994 15:28:01 +0000
Subject: [PATCH] .

---
 src/tail.c |  3 ++-
 src/wc.c   | 24 +++++++++++++++++++++---
 2 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/src/tail.c b/src/tail.c
index fd42a71532..727084ebad 100644
--- a/src/tail.c
+++ b/src/tail.c
@@ -968,7 +968,8 @@ tail_forever (names, nfiles)
 	     then keep looping.  */
 	  if (i != last)
 	    {
-	      write_header (names[i]);
+	      if (print_headers)
+		write_header (names[i]);
 	      last = i;
 	    }
 	  changed = 1;
diff --git a/src/wc.c b/src/wc.c
index 6480c7872a..904efe5c90 100644
--- a/src/wc.c
+++ b/src/wc.c
@@ -214,10 +214,28 @@ wc (fd, file)
 
   lines = words = chars = 0;
 
-  if (print_chars && !print_words && !print_lines
-      && fstat (fd, &stats) == 0 && S_ISREG (stats.st_mode))
+  /* When counting only bytes, save some line- and word-counting
+     overhead.  If FD is a `regular' Unix file, using fstat is enough
+     to get its size in bytes.  Otherwise, read blocks of BUFFER_SIZE
+     bytes at a time until EOF.  */
+  if (print_chars && !print_words && !print_lines)
     {
-      chars = stats.st_size;
+      if (fstat (fd, &stats) == 0 && S_ISREG (stats.st_mode))
+	{
+	  chars = stats.st_size;
+	}
+      else
+	{
+	  while ((bytes_read = safe_read (fd, buf, BUFFER_SIZE)) > 0)
+	    {
+	      chars += bytes_read;
+	    }
+	  if (bytes_read < 0)
+	    {
+	      error (0, errno, "%s", file);
+	      exit_status = 1;
+	    }
+	}
     }
   else
     {
-- 
2.47.3