Import sendmail 8.12.2

1 files changed, 190 insertions, 0 deletions

diff --git a/contrib/sendmail/libsm/setvbuf.c b/contrib/sendmail/libsm/setvbuf.c
new file mode 100644
index 0000000..172a767
--- /dev/null
+++ b/contrib/sendmail/libsm/setvbuf.c
@@ -0,0 +1,190 @@
+/*
+ * 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: setvbuf.c,v 1.32 2001/09/11 04:04:49 gshapiro Exp $")
+#include <stdlib.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sm/io.h>
+#include <sm/heap.h>
+#include <sm/assert.h>
+#include <sm/conf.h>
+#include "local.h"
+
+/*
+**  SM_IO_SETVBUF -- set the buffering type for a file
+**
+**  Set one of the different kinds of buffering, optionally including
+**  a buffer.
+**  If 'size' is == 0 then an "optimal" size will be selected.
+**  If 'buf' is == NULL then space will be allocated at 'size'.
+**
+**	Parameters:
+**		fp -- the file that buffering is to be changed for
+**		timeout -- time allowed for completing the function
+**		buf -- buffer to use
+**		mode -- buffering method to use
+**		size -- size of 'buf'
+**
+**	Returns:
+**		Failure: SM_IO_EOF
+**		Success: 0 (zero)
+*/
+
+int
+sm_io_setvbuf(fp, timeout, buf, mode, size)
+	SM_FILE_T *fp;
+	int timeout;
+	char *buf;
+	int mode;
+	size_t size;
+{
+	int ret, flags;
+	size_t iosize;
+	int ttyflag;
+	int fd;
+	struct timeval to;
+
+	SM_REQUIRE_ISA(fp, SmFileMagic);
+
+	/*
+	**  Verify arguments.  The `int' limit on `size' is due to this
+	**  particular implementation.  Note, buf and size are ignored
+	**  when setting SM_IO_NBF.
+	*/
+
+	if (mode != SM_IO_NBF)
+		if ((mode != SM_IO_FBF && mode != SM_IO_LBF &&
+		    mode != SM_IO_NOW) || (int) size < 0)
+			return SM_IO_EOF;
+
+	/*
+	**  Write current buffer, if any.  Discard unread input (including
+	**  ungetc data), cancel line buffering, and free old buffer if
+	**  malloc()ed.  We also clear any eof condition, as if this were
+	**  a seek.
+	*/
+
+	ret = 0;
+	SM_CONVERT_TIME(fp, fd, timeout, &to);
+	(void) sm_flush(fp, &timeout);
+	if (HASUB(fp))
+		FREEUB(fp);
+	fp->f_r = fp->f_lbfsize = 0;
+	flags = fp->f_flags;
+	if (flags & SMMBF)
+	{
+		sm_free((void *) fp->f_bf.smb_base);
+		fp->f_bf.smb_base = NULL;
+	}
+	flags &= ~(SMLBF | SMNBF | SMMBF | SMOPT | SMNPT | SMFEOF | SMNOW |
+		   SMFBF);
+
+	/* If setting unbuffered mode, skip all the hard work. */
+	if (mode == SM_IO_NBF)
+		goto nbf;
+
+	/*
+	**  Find optimal I/O size for seek optimization.  This also returns
+	**  a `tty flag' to suggest that we check isatty(fd), but we do not
+	**  care since our caller told us how to buffer.
+	*/
+
+	flags |= sm_whatbuf(fp, &iosize, &ttyflag);
+	if (size == 0)
+	{
+		buf = NULL;	/* force local allocation */
+		size = iosize;
+	}
+
+	/* Allocate buffer if needed. */
+	if (buf == NULL)
+	{
+		if ((buf = sm_malloc(size)) == NULL)
+		{
+			/*
+			**  Unable to honor user's request.  We will return
+			**  failure, but try again with file system size.
+			*/
+
+			ret = SM_IO_EOF;
+			if (size != iosize)
+			{
+				size = iosize;
+				buf = sm_malloc(size);
+			}
+		}
+		if (buf == NULL)
+		{
+			/* No luck; switch to unbuffered I/O. */
+nbf:
+			fp->f_flags = flags | SMNBF;
+			fp->f_w = 0;
+			fp->f_bf.smb_base = fp->f_p = fp->f_nbuf;
+			fp->f_bf.smb_size = 1;
+			return ret;
+		}
+		flags |= SMMBF;
+	}
+
+	/*
+	**  Kill any seek optimization if the buffer is not the
+	**  right size.
+	**
+	**  SHOULD WE ALLOW MULTIPLES HERE (i.e., ok iff (size % iosize) == 0)?
+	*/
+
+	if (size != iosize)
+		flags |= SMNPT;
+
+	/*
+	**  Fix up the SM_FILE_T fields, and set sm_cleanup for output flush on
+	**  exit (since we are buffered in some way).
+	*/
+
+	if (mode == SM_IO_LBF)
+		flags |= SMLBF;
+	else if (mode == SM_IO_NOW)
+		flags |= SMNOW;
+	else if (mode == SM_IO_FBF)
+		flags |= SMFBF;
+	fp->f_flags = flags;
+	fp->f_bf.smb_base = fp->f_p = (unsigned char *)buf;
+	fp->f_bf.smb_size = size;
+	/* fp->f_lbfsize is still 0 */
+	if (flags & SMWR)
+	{
+		/*
+		**  Begin or continue writing: see sm_wsetup().  Note
+		**  that SMNBF is impossible (it was handled earlier).
+		*/
+
+		if (flags & SMLBF)
+		{
+			fp->f_w = 0;
+			fp->f_lbfsize = -fp->f_bf.smb_size;
+		}
+		else
+			fp->f_w = size;
+	}
+	else
+	{
+		/* begin/continue reading, or stay in intermediate state */
+		fp->f_w = 0;
+	}
+
+	atexit(sm_cleanup);
+	return ret;
+}