1 files changed, 84 insertions, 0 deletions
diff --git a/contrib/sendmail/libsm/wsetup.c b/contrib/sendmail/libsm/wsetup.c
new file mode 100644
index 000000000000..bcb4df7f4fc4
--- /dev/null
+++ b/contrib/sendmail/libsm/wsetup.c
@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2000-2002 Proofpoint, Inc. and its suppliers.
+ *      All rights reserved.
+ * Copyright (c) 1990, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Chris Torek.
+ *
+ * By using this file, you agree to the terms and conditions set
+ * forth in the LICENSE file which can be found at the top level of
+ * the sendmail distribution.
+ */
+
+#include <sm/gen.h>
+SM_RCSID("@(#)$Id: wsetup.c,v 1.21 2013-11-22 20:51:44 ca Exp $")
+#include <stdlib.h>
+#include <errno.h>
+#include <sm/io.h>
+#include "local.h"
+
+/*
+**  SM_WSETUP -- check writing is safe
+**
+**  Various output routines call wsetup to be sure it is safe to write,
+**  because either flags does not include SMMWR, or buf is NULL.
+**  Used in the macro "cantwrite" found in "local.h".
+**
+**	Parameters:
+**		fp -- the file pointer
+**
+**	Results:
+**		Failure: SM_IO_EOF and sets errno
+**		Success: 0 (zero)
+*/
+
+int
+sm_wsetup(fp)
+	register SM_FILE_T *fp;
+{
+	/* make sure stdio is set up */
+	if (!Sm_IO_DidInit)
+		sm_init();
+
+	/* If we are not writing, we had better be reading and writing. */
+	if ((fp->f_flags & SMWR) == 0)
+	{
+		if ((fp->f_flags & SMRW) == 0)
+		{
+			errno = EBADF;
+			return SM_IO_EOF;
+		}
+		if (fp->f_flags & SMRD)
+		{
+			/* clobber any ungetc data */
+			if (HASUB(fp))
+				FREEUB(fp);
+
+			/* discard read buffer */
+			fp->f_flags &= ~(SMRD|SMFEOF);
+			fp->f_r = 0;
+			fp->f_p = fp->f_bf.smb_base;
+		}
+		fp->f_flags |= SMWR;
+	}
+
+	/* Make a buffer if necessary, then set w. */
+	if (fp->f_bf.smb_base == NULL)
+		sm_makebuf(fp);
+	if (fp->f_flags & SMLBF)
+	{
+		/*
+		**  It is line buffered, so make lbfsize be -bufsize
+		**  for the sm_putc() macro.  We will change lbfsize back
+		**  to 0 whenever we turn off SMWR.
+		*/
+
+		fp->f_w = 0;
+		fp->f_lbfsize = -fp->f_bf.smb_size;
+	}
+	else
+		fp->f_w = fp->f_flags & SMNBF ? 0 : fp->f_bf.smb_size;
+	return 0;
+}