maint: use xsetmode, not xfreopen

This fixes a bug noted by Eric Blake.  Code was using xfreopen to
change files to binary mode, but this fails for stdout when in
append mode.  Such code should use xsetmode instead.  This affects
only the port on platforms like MS-Windows which distiguish text
from binary I/O.
* bootstrap.conf (gnulib_modules):
Remove xfreopen and add xsetmode.  Sort.
* src/base64.c (main):
* src/cat.c (main):
* src/cksum.c (cksum):
* src/head.c (head_file, main):
* src/md5sum.c (digest_file):
* src/od.c (open_next_file):
* src/split.c (main):
* src/sum.c (bsd_sum_file, sysv_sum_file):
* src/tac.c (tac_file, main):
* src/tail.c (tail_file):
* src/tee.c (tee_files):
* src/tr.c (main):
* src/wc.c (wc_file): Use xsetmode, not xfreopen.

1 files changed, 3 insertions, 5 deletions

diff --git a/src/tac.c b/src/tac.c
index 5c1b3e8a2..41c4f998a 100644
--- a/src/tac.c
+++ b/src/tac.c
@@ -48,7 +48,7 @@ tac -r -s '.\|
 #include "filenamecat.h"
 #include "safe-read.h"
 #include "stdlib--.h"
-#include "xfreopen.h"
+#include "xsetmode.h"
 
 /* The official name of this program (e.g., no 'g' prefix).  */
 #define PROGRAM_NAME "tac"
@@ -572,8 +572,7 @@ tac_file (const char *filename)
       have_read_stdin = true;
       fd = STDIN_FILENO;
       filename = _("standard input");
-      if (O_BINARY && ! isatty (STDIN_FILENO))
-        xfreopen (NULL, "rb", stdin);
+      xsetmode (STDIN_FILENO, O_BINARY);
     }
   else
     {
@@ -688,8 +687,7 @@ main (int argc, char **argv)
           ? (char const *const *) &argv[optind]
           : default_file_list);
 
-  if (O_BINARY && ! isatty (STDOUT_FILENO))
-    xfreopen (NULL, "wb", stdout);
+  xsetmode (STDOUT_FILENO, O_BINARY);
 
   {
     size_t i;