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510 jermar 1 
/*
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 * Copyright (C) 2003 Josef Cejka
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 * Copyright (C) 2005 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <console/console.h>
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#include <console/chardev.h>
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#include <synch/waitq.h>
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#include <synch/spinlock.h>
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#include <arch/types.h>
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#include <typedefs.h>
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#include <arch.h>
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#include <func.h>
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#include <print.h>
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#include <atomic.h>
510 jermar 40 
 
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#define BUFLEN 2048
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static char debug_buffer[BUFLEN];
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static size_t offset = 0;
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/** Initialize stdout to something that does not print, but does not fail
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 *
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 * Save data in some buffer so that it could be retrieved in the debugger
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 */
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static void null_putchar(chardev_t *d, const char ch)
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{
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    if (offset >= BUFLEN)
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        offset = 0;
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    debug_buffer[offset++] = ch;
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}
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static chardev_operations_t null_stdout_ops = {
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    .write = null_putchar
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};
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chardev_t null_stdout = {
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    .name = "null",
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    .op = &null_stdout_ops
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};
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510 jermar 63 
/** Standard input character device. */
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chardev_t *stdin = NULL;
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chardev_t *stdout = &null_stdout;
510 jermar 66 
 
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/** Get character from character device. Do not echo character.
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 *
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 * @param chardev Character device.
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 *
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 * @return Character read.
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 */
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__u8 _getc(chardev_t *chardev)
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{
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    __u8 ch;
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    ipl_t ipl;
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    if (atomic_get(&haltstate)) {
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        /* If we are here, we are hopefully on the processor, that
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         * issued the 'halt' command, so proceed to read the character
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         * directly from input
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         */
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        if (chardev->op->read)
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            return chardev->op->read(chardev);
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        /* no other way of interacting with user, halt */
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        if (CPU)
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            printf("cpu%d: ", CPU->id);
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        else
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            printf("cpu: ");
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        printf("halted - no kconsole\n");
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        cpu_halt();
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    }
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    waitq_sleep(&chardev->wq);
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    ipl = interrupts_disable();
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    spinlock_lock(&chardev->lock);
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    ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN];
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    chardev->counter--;
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    spinlock_unlock(&chardev->lock);
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    interrupts_restore(ipl);
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    chardev->op->resume(chardev);
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    return ch;
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}
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510 jermar 107 
/** Get string from character device.
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 *
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 * Read characters from character device until first occurrence
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 * of newline character.
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 *
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 * @param chardev Character device.
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 * @param buf Buffer where to store string terminated by '\0'.
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 * @param len Size of the buffer.
517 jermar 115 
 *
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 * @return Number of characters read.
510 jermar 117 
 */
517 jermar 118 
count_t gets(chardev_t *chardev, char *buf, size_t buflen)
510 jermar 119 
{
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    index_t index = 0;
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    char ch;
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    while (index < buflen) {
588 palkovsky 124 
        ch = _getc(chardev);
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        if (ch == '\b') {
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            if (index > 0) {
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                index--;
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                /* Space backspace, space */
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                putchar('\b');
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                putchar(' ');
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                putchar('\b');
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            }
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            continue;
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        }
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        putchar(ch);
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510 jermar 137 
        if (ch == '\n') { /* end of string => write 0, return */
517 jermar 138 
            buf[index] = '\0';
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            return (count_t) index;
510 jermar 140 
        }
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        buf[index++] = ch;
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    }
517 jermar 143 
    return (count_t) index;
510 jermar 144 
}
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588 palkovsky 146 
/** Get character from device & echo it to screen */
510 jermar 147 
__u8 getc(chardev_t *chardev)
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{
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    __u8 ch;
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588 palkovsky 151 
    ch = _getc(chardev);
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    putchar(ch);
510 jermar 153 
    return ch;
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}
575 palkovsky 155 
 
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void putchar(char c)
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{
607 palkovsky 158 
    if (stdout->op->write)
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        stdout->op->write(stdout, c);
575 palkovsky 160 
}