use xfreopen in place of unchecked freopen

* bootstrap.conf (modules): Add xfreopen.
* src/cat.c (main): Include "xfreopen.h".  Use xfreopen.
* src/cksum.c (cksum): Likewise.
* src/head.c (head_file, main): Likewise.
* src/md5sum.c (digest_file): Likewise.
* src/od.c (open_next_file): Likewise.
* src/split.c (type_undef): Likewise.
* src/sum.c (bsd_sum_file, sysv_sum_file): Likewise.
* src/tac.c (tac_file, main): Likewise.
* src/tail.c (tail_file, main): Likewise.
* src/tee.c (tee_files): Likewise.
* src/tr.c (main): Likewise.
* src/wc.c (wc_file): Likewise.
* po/POTFILES.in: Add lib/xfreopen.c

1 files changed, 3 insertions, 2 deletions

diff --git a/src/tac.c b/src/tac.c
index c83986f59..be8f3abcc 100644
--- a/src/tac.c
+++ b/src/tac.c
@@ -48,6 +48,7 @@ tac -r -s '.\|
 #include "quotearg.h"
 #include "safe-read.h"
 #include "stdlib--.h"
+#include "xfreopen.h"
 
 /* The official name of this program (e.g., no `g' prefix).  */
 #define PROGRAM_NAME "tac"
@@ -533,7 +534,7 @@ tac_file (const char *filename)
       fd = STDIN_FILENO;
       filename = _("standard input");
       if (O_BINARY && ! isatty (STDIN_FILENO))
-	freopen (NULL, "rb", stdin);
+	xfreopen (NULL, "rb", stdin);
     }
   else
     {
@@ -647,7 +648,7 @@ main (int argc, char **argv)
 	  : default_file_list);
 
   if (O_BINARY && ! isatty (STDOUT_FILENO))
-    freopen (NULL, "wb", stdout);
+    xfreopen (NULL, "wb", stdout);
 
   {
     size_t i;