diff options
Diffstat (limited to 'src/iobuf.c')
-rw-r--r-- | src/iobuf.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/src/iobuf.c b/src/iobuf.c new file mode 100644 index 0000000..61ec9c1 --- /dev/null +++ b/src/iobuf.c @@ -0,0 +1,87 @@ +/***************************************************************************** + * + * mtdev - Multitouch Protocol Translation Library (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" +#include <unistd.h> +#include <poll.h> + +int mtdev_idle(struct mtdev *dev, int fd, int ms) +{ + struct mtdev_iobuf *buf = &dev->state->iobuf; + struct pollfd fds = { fd, POLLIN, 0 }; + return buf->head == buf->tail && poll(&fds, 1, ms) <= 0; +} + +int mtdev_fetch_event(struct mtdev *dev, int fd, struct input_event *ev) +{ + 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_empty(struct mtdev *dev) +{ + return evbuf_empty(&dev->state->outbuf); +} + +void mtdev_get_event(struct mtdev *dev, struct input_event* ev) +{ + evbuf_get(&dev->state->outbuf, ev); +} + +int mtdev_get(struct mtdev *dev, int fd, struct input_event* ev, int ev_max) +{ + struct input_event kev; + int ret, count = 0; + while (count < ev_max) { + while (mtdev_empty(dev)) { + ret = mtdev_fetch_event(dev, fd, &kev); + if (ret <= 0) + return count > 0 ? count : ret; + mtdev_put_event(dev, &kev); + } + mtdev_get_event(dev, &ev[count++]); + } + return count; +} |