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/cat.c b/src/cat.c
index 9c1996a67..543e5cf13 100644
--- a/src/cat.c
+++ b/src/cat.c
@@ -39,6 +39,7 @@
 #include "full-write.h"
 #include "quote.h"
 #include "safe-read.h"
+#include "xfreopen.h"
 
 /* The official name of this program (e.g., no `g' prefix).  */
 #define PROGRAM_NAME "cat"
@@ -664,7 +665,7 @@ main (int argc, char **argv)
     {
       file_open_mode |= O_BINARY;
       if (O_BINARY && ! isatty (STDOUT_FILENO))
-	freopen (NULL, "wb", stdout);
+	xfreopen (NULL, "wb", stdout);
     }
 
   /* Check if any of the input files are the same as the output file.  */
@@ -684,7 +685,7 @@ main (int argc, char **argv)
 	  have_read_stdin = true;
 	  input_desc = STDIN_FILENO;
 	  if ((file_open_mode & O_BINARY) && ! isatty (STDIN_FILENO))
-	    freopen (NULL, "rb", stdin);
+	    xfreopen (NULL, "rb", stdin);
 	}
       else
 	{