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