Initial load of mtdev project

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>

1 files changed, 69 insertions, 0 deletions

diff --git a/src/iobuf.c b/src/iobuf.c
new file mode 100644
index 0000000..6d238ec
--- /dev/null
+++ b/src/iobuf.c
@@ -0,0 +1,69 @@
+/*****************************************************************************
+ *
+ * mtdev - MT device event converter (MIT license)
+ *
+ * Copyright (C) 2010 Henrik Rydberg <rydberg@euromail.se>
+ * Copyright (C) 2010 Canonical Ltd.
+ *
+ * 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 (including the next
+ * paragraph) 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 AUTHORS OR COPYRIGHT HOLDERS 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.
+ *
+ ****************************************************************************/
+
+#include "iobuf.h"
+#include "state.h"
+
+int mtdev_fetch(struct mtdev *dev, struct input_event *ev, int fd)
+{
+        struct mtdev_iobuf *buf = &dev->state->iobuf;
+        int n = buf->head - buf->tail;
+        if (n < EVENT_SIZE) {
+                if (buf->tail && n > 0)
+                        memmove(buf->data, buf->data + buf->tail, n);
+                buf->head = n;
+                buf->tail = 0;
+                SYSCALL(n = read(fd, buf->data + buf->head,
+                                 DIM_BUFFER - buf->head));
+                if (n <= 0)
+                        return n;
+                buf->head += n;
+        }
+        if (buf->head - buf->tail < EVENT_SIZE)
+                return 0;
+        memcpy(ev, buf->data + buf->tail, EVENT_SIZE);
+        buf->tail += EVENT_SIZE;
+        return 1;
+}
+
+int mtdev_pull(struct mtdev *dev, int fd, int max_events)
+{
+        struct mtdev_state *state = dev->state;
+        struct input_event ev;
+        int ret, count = 0;
+        while (max_events-- && !evbuf_full(&state->inbuf)) {
+                ret = mtdev_fetch(dev, &ev, fd);
+                if (ret < 0)
+                        return ret;
+                if (ret == 0)
+                        break;
+                mtdev_put(dev, &ev);
+                count++;
+        }
+        return count;
+}