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/sum.c b/src/sum.c
index 314656f53..4cb8f31aa 100644
--- a/src/sum.c
+++ b/src/sum.c
@@ -28,6 +28,7 @@
 #include "error.h"
 #include "human.h"
 #include "safe-read.h"
+#include "xfreopen.h"
 
 /* The official name of this program (e.g., no `g' prefix).  */
 #define PROGRAM_NAME "sum"
@@ -97,7 +98,7 @@ bsd_sum_file (const char *file, int print_name)
       fp = stdin;
       have_read_stdin = true;
       if (O_BINARY && ! isatty (STDIN_FILENO))
-	freopen (NULL, "rb", stdin);
+	xfreopen (NULL, "rb", stdin);
     }
   else
     {
@@ -165,7 +166,7 @@ sysv_sum_file (const char *file, int print_name)
       fd = STDIN_FILENO;
       have_read_stdin = true;
       if (O_BINARY && ! isatty (STDIN_FILENO))
-	freopen (NULL, "rb", stdin);
+	xfreopen (NULL, "rb", stdin);
     }
   else
     {