1 files changed, 100 insertions, 0 deletions
diff --git a/contrib/sendmail/libsm/fread.c b/contrib/sendmail/libsm/fread.c
new file mode 100644
index 0000000..1e651fd
--- /dev/null
+++ b/contrib/sendmail/libsm/fread.c
@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 2000-2001 Sendmail, 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: fread.c,v 1.28 2001/09/11 04:04:48 gshapiro Exp $")
+#include <string.h>
+#include <errno.h>
+#include <sm/io.h>
+#include <sm/assert.h>
+#include "local.h"
+
+/*
+**  SM_IO_READ -- read data from the file pointer
+**
+**	Parameters:
+**		fp -- file pointer to read from
+**		timeout -- time to complete the read
+**		buf -- location to place read data
+**		size -- size of each chunk of data
+**
+**	Returns:
+**		Failure: returns 0 (zero) _and_ sets errno
+**		Success: returns the number of whole chunks read.
+**
+**	A read returning 0 (zero) is only an indication of error when errno
+**	has been set.
+*/
+
+size_t
+sm_io_read(fp, timeout, buf, size)
+	SM_FILE_T *fp;
+	int timeout;
+	void *buf;
+	size_t size;
+{
+	register size_t resid = size;
+	register char *p;
+	register int r;
+
+	SM_REQUIRE_ISA(fp, SmFileMagic);
+
+	if (fp->f_read == NULL)
+	{
+		errno = ENODEV;
+		return 0;
+	}
+
+	/*
+	**  The ANSI standard requires a return value of 0 for a count
+	**  or a size of 0.  Peculiarily, it imposes no such requirements
+	**  on fwrite; it only requires read to be broken.
+	*/
+
+	if (resid == 0)
+		return 0;
+	if (fp->f_r < 0)
+		fp->f_r = 0;
+	p = buf;
+	while ((int) resid > (r = fp->f_r))
+	{
+		(void) memcpy((void *) p, (void *) fp->f_p, (size_t) r);
+		fp->f_p += r;
+		/* fp->f_r = 0 ... done in sm_refill */
+		p += r;
+		resid -= r;
+		if ((fp->f_flags & SMNOW) != 0 && r > 0)
+		{
+			/*
+			**  Take whatever we have available. Spend no more time
+			**  trying to get all that has been requested.
+			**  This is needed on some file types (such as
+			**  SASL) that would jam when given extra, untimely
+			**  reads.
+			*/
+
+			fp->f_r -= r;
+			return size - resid;
+		}
+		if (sm_refill(fp, timeout) != 0)
+		{
+			/* no more input: return partial result */
+			return size - resid;
+		}
+	}
+	(void) memcpy((void *) p, (void *) fp->f_p, resid);
+	fp->f_r -= resid;
+	fp->f_p += resid;
+	return size;
+}