Diffutils 3.2 call xfreopen with its first argument NULL, expecting
the underlying reopen to handle this. However, the MS runtime does
not implement the Posix semantics of such a call, and so, for example,
MinGW-compiled cmp fails when invoked to compare its stdin with a
file:
D:\gnu\diffutils-3.2\src>cat cmp.c | cmp cmp.c -
cmp: failed to reopen `stdin' with mode `rb': No such file or directory
The following change fixes this:
2012-05-05 Eli Zaretskii <e...@gnu.org>
* lib/freopen.c [_WIN32]: Include io.h and fcntl.h.
(rpl_freopen) [_WIN32]: If the first argument is NULL, call
_setmode to switch STREAM to either binary or text mode, as
specified by MODE.
--- lib/freopen.c~0 2011-09-02 01:35:11.000000000 +0300
+++ lib/freopen.c 2012-05-05 13:46:36.389000000 +0300
@@ -37,11 +37,23 @@ orig_freopen (const char *filename, cons
#include <string.h>
+#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+#include <io.h>
+#include <fcntl.h>
+#endif
+
FILE *
rpl_freopen (const char *filename, const char *mode, FILE *stream)
{
#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
- if (filename != NULL && strcmp (filename, "/dev/null") == 0)
+ if (filename == NULL)
+ {
+ if (strchr (mode, 'b'))
+ return _setmode (_fileno (stream), _O_BINARY) == -1 ? NULL : stream;
+ else
+ return _setmode (_fileno (stream), _O_TEXT) == -1 ? NULL : stream;
+ }
+ else if (strcmp (filename, "/dev/null") == 0)
filename = "NUL";
#endif
