Initial revision

1 files changed, 172 insertions, 0 deletions

diff --git a/hw/xfree86/common/xisb.c b/hw/xfree86/common/xisb.c
new file mode 100644
index 000000000..4132c7abf
--- /dev/null
+++ b/hw/xfree86/common/xisb.c
@@ -0,0 +1,172 @@
+/*
+ * Copyright (c) 1997  Metro Link Incorporated
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+ * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Except as contained in this notice, the name of the Metro Link shall not be
+ * used in advertising or otherwise to promote the sale, use or other dealings
+ * in this Software without prior written authorization from Metro Link.
+ *
+ */
+/* $XFree86: xc/programs/Xserver/hw/xfree86/common/xisb.c,v 1.5 2000/11/06 19:24:07 dawes Exp $ */
+
+/*
+	X Input Serial Buffer routines for use in any XInput driver that accesses
+	a serial device.
+*/
+
+
+/*****************************************************************************
+ *	Standard Headers
+ ****************************************************************************/
+
+#include <misc.h>
+#include <xf86.h>
+#include <xf86Version.h>
+#include <xf86_OSproc.h>
+#include <xf86_OSlib.h>
+#include <xf86Xinput.h>
+#include "xisb.h"
+
+/*****************************************************************************
+ *	Local Headers
+ ****************************************************************************/
+
+/*****************************************************************************
+ *	Variables without includable headers
+ ****************************************************************************/
+
+/*****************************************************************************
+ *	Local Variables
+ ****************************************************************************/
+
+/*****************************************************************************
+ *	Function Definitions
+ ****************************************************************************/
+
+XISBuffer *
+XisbNew (int fd, xf86ssize_t size)
+{
+	XISBuffer *b;
+
+	b = xalloc (sizeof (XISBuffer));
+	if (!b)
+		return (NULL);
+	b->buf = xalloc ((sizeof (unsigned char) * size));
+	if (!b->buf)
+	{
+		xfree (b);
+		return (NULL);
+	}
+
+	b->fd = fd;
+	b->trace = 0;
+	b->block_duration = 0;
+	b->current = 1;	/* force it to be past the end to trigger initial read */
+	b->end = 0;
+	b->buffer_size = size;
+	return (b);
+}
+
+void
+XisbFree (XISBuffer *b)
+{
+	xfree (b->buf);
+	xfree (b);
+}
+
+int
+XisbRead (XISBuffer *b)
+{
+	int ret;
+
+	if (b->current >= b->end)
+	{
+		if (b->block_duration >= 0)
+		{
+			if (xf86WaitForInput (b->fd, b->block_duration) < 1)
+				return (-1);
+		}
+		else
+		{
+			/*
+			 * automatically clear it so if XisbRead is called in a loop
+			 * the next call will make sure there is data with select and
+			 * thus prevent a blocking read
+			 */
+			b->block_duration = 0;
+		}
+		
+		ret = xf86ReadSerial (b->fd, b->buf, b->buffer_size);
+		switch (ret)
+		{
+			case 0:
+				return (-1); /* timeout */
+			case -1:
+				return (-2); /* error */
+			default:
+				b->end = ret;
+				b->current = 0;
+				break;
+		}
+	}
+	if (b->trace)
+		ErrorF ("read 0x%02x (%c)\n", b->buf[b->current], 
+			isprint(b->buf[b->current])?b->buf[b->current]:'.');
+
+	return (b->buf[b->current++]);
+}
+
+/* the only purpose of this function is to provide output tracing */
+xf86ssize_t
+XisbWrite (XISBuffer *b, unsigned char *msg, xf86ssize_t len)
+{
+    if (b->trace)
+    {
+        int i = 0;
+        for (i = 0; i < len; i++)
+            ErrorF ("\t\twrote 0x%02x (%c)\n", msg[i], msg[i]);
+    }
+    return (xf86WriteSerial (b->fd, msg, len));
+}
+
+/* turn tracing of this buffer on (1) or off (0) */
+void
+XisbTrace (XISBuffer *b, int trace)
+{
+	b->trace = trace;
+}
+
+/*
+ * specify a block_duration of -1 when you know the buffer's fd is ready to
+ * read. After a read, it is automatically set to 0 so that the next read
+ * will use check to select for data and prevent a block.
+ * It is the caller's responsibility to set the block_duration to -1 if it
+ * knows that there is data to read (because the main select loop triggered
+ * the read) and want's to avoid the unnecessary overhead of the select call
+ *
+ * a zero or positive block duration will cause the select to block for the
+ * give duration in usecs.
+ */
+
+void
+XisbBlockDuration (XISBuffer *b, int block_duration)
+{
+	b->block_duration = block_duration;
+}