(tail_bytes, tail_lines, tail_file, main):

Avoid setmode; use POSIX-specified routines instead.

diff --git a/src/tail.c b/src/tail.c
index f78f6f4..cb2b1b7 100644 (file)
--- a/src/tail.c
+++ b/src/tail.c
@@ -1127,10 +1127,6 @@ tail_bytes (const char *pretty_filename, int fd, uintmax_t n_bytes,
 {
   struct stat stats;
 
-  /* We need binary input, since `tail' relies on `lseek' and byte counts,
-     while binary output will preserve the style (Unix/DOS) of text file.  */
-  SET_BINARY2 (fd, STDOUT_FILENO);
-
   if (fstat (fd, &stats))
     {
       error (0, errno, _("cannot fstat %s"), quote (pretty_filename));
@@ -1197,10 +1193,6 @@ tail_lines (const char *pretty_filename, int fd, uintmax_t n_lines,
 {
   struct stat stats;
 
-  /* We need binary input, since `tail' relies on `lseek' and byte counts,
-     while binary output will preserve the style (Unix/DOS) of text file.  */
-  SET_BINARY2 (fd, STDOUT_FILENO);
-
   if (fstat (fd, &stats))
     {
       error (0, errno, _("cannot fstat %s"), quote (pretty_filename));
@@ -1283,9 +1275,11 @@ tail_file (struct File_spec *f, uintmax_t n_units)
     {
       have_read_stdin = true;
       fd = STDIN_FILENO;
+      if (O_BINARY && ! isatty (STDIN_FILENO))
+       freopen (NULL, "rb", stdin);
     }
   else
-    fd = open (f->name, O_RDONLY);
+    fd = open (f->name, O_RDONLY | O_BINARY);
 
   f->tailable = !(reopen_inaccessible_files && fd == -1);
 
@@ -1675,6 +1669,9 @@ main (int argc, char **argv)
       || (header_mode == multiple_files && n_files > 1))
     print_headers = true;
 
+  if (O_BINARY && ! isatty (STDOUT_FILENO))
+    freopen (NULL, "wb", stdout);
+
   for (i = 0; i < n_files; i++)
     ok &= tail_file (&F[i], n_units);