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-rw-r--r--hw/xfree86/common/xisb.c172
1 files changed, 172 insertions, 0 deletions
diff --git a/hw/xfree86/common/xisb.c b/hw/xfree86/common/xisb.c
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+++ b/hw/xfree86/common/xisb.c
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+/*
+ * 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;
+}