HelenOS sources

root/kernel/genarch/src/srln/srln.c

DEFINITIONS

1. ksrln
2. srln_init
3. srln_wire

/*
 * Copyright (c) 2009 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup kernel_genarch
 * @{
 */
/**
 * @file
 * @brief Serial line processing.
 */

#include <assert.h>
#include <genarch/srln/srln.h>
#include <console/chardev.h>
#include <console/console.h>
#include <proc/thread.h>
#include <arch.h>
#include <str.h>
#include <stdlib.h>

static indev_operations_t srln_raw_ops = {
        .poll = NULL,
        .signal = NULL
};

static void ksrln(void *arg)
{
        srln_instance_t *instance = (srln_instance_t *) arg;
        bool cr = false;
        uint32_t escape = 0;

        while (true) {
                char32_t ch = indev_pop_character(&instance->raw);

                /* ANSI escape sequence processing */
                if (escape != 0) {
                        escape <<= 8;
                        escape |= ch & 0xff;

                        if ((escape == 0x1b4f) || (escape == 0x1b5b) || (escape == 0x1b5b33))
                                continue;

                        switch (escape) {
                        case 0x1b4f46:
                        case 0x1b5b46:
                                ch = U_END_ARROW;
                                escape = 0;
                                break;
                        case 0x1b4f48:
                        case 0x1b5b48:
                                ch = U_HOME_ARROW;
                                escape = 0;
                                break;
                        case 0x1b5b41:
                                ch = U_UP_ARROW;
                                escape = 0;
                                break;
                        case 0x1b5b42:
                                ch = U_DOWN_ARROW;
                                escape = 0;
                                break;
                        case 0x1b5b43:
                                ch = U_RIGHT_ARROW;
                                escape = 0;
                                break;
                        case 0x1b5b44:
                                ch = U_LEFT_ARROW;
                                escape = 0;
                                break;
                        case 0x1b5b337e:
                                ch = U_DELETE;
                                escape = 0;
                                break;
                        default:
                                escape = 0;
                        }
                }

                if (ch == 0x1b) {
                        escape = ch & 0xff;
                        continue;
                }

                /*
                 * Replace carriage return with line feed
                 * and suppress any following line feed
                 */
                if ((ch == '\n') && (cr)) {
                        cr = false;
                        continue;
                }

                if (ch == '\r') {
                        ch = '\n';
                        cr = true;
                } else
                        cr = false;

                /* Backspace */
                if (ch == 0x7f)
                        ch = '\b';

                indev_push_character(instance->sink, ch);
        }
}

srln_instance_t *srln_init(void)
{
        srln_instance_t *instance =
            malloc(sizeof(srln_instance_t));
        if (instance) {
                instance->thread = thread_create(ksrln, (void *) instance,
                    TASK, THREAD_FLAG_NONE, "ksrln");

                if (!instance->thread) {
                        free(instance);
                        return NULL;
                }

                instance->sink = NULL;
                indev_initialize("srln", &instance->raw, &srln_raw_ops);
        }

        return instance;
}

indev_t *srln_wire(srln_instance_t *instance, indev_t *sink)
{
        assert(instance);
        assert(sink);

        instance->sink = sink;
        thread_start(instance->thread);

        return &instance->raw;
}

/** @}
 */