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  1. /*
  2.  * Copyright (C) 2003 Josef Cejka
  3.  * Copyright (C) 2005 Jakub Jermar
  4.  * All rights reserved.
  5.  *
  6.  * Redistribution and use in source and binary forms, with or without
  7.  * modification, are permitted provided that the following conditions
  8.  * are met:
  9.  *
  10.  * - Redistributions of source code must retain the above copyright
  11.  *   notice, this list of conditions and the following disclaimer.
  12.  * - Redistributions in binary form must reproduce the above copyright
  13.  *   notice, this list of conditions and the following disclaimer in the
  14.  *   documentation and/or other materials provided with the distribution.
  15.  * - The name of the author may not be used to endorse or promote products
  16.  *   derived from this software without specific prior written permission.
  17.  *
  18.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28.  */
  29.  
  30. #include <console/console.h>
  31. #include <console/chardev.h>
  32. #include <synch/waitq.h>
  33. #include <synch/spinlock.h>
  34. #include <arch/types.h>
  35. #include <typedefs.h>
  36. #include <arch.h>
  37. #include <func.h>
  38. #include <print.h>
  39.  
  40. /** Standard input character device. */
  41. chardev_t *stdin = NULL;
  42. chardev_t *stdout = NULL;
  43.  
  44. /** Get character from character device. Do not echo character.
  45.  *
  46.  * @param chardev Character device.
  47.  *
  48.  * @return Character read.
  49.  */
  50. __u8 _getc(chardev_t *chardev)
  51. {
  52.     __u8 ch;
  53.     ipl_t ipl;
  54.  
  55.     if (haltstate) {
  56.         /* If we are here, we are hopefully on the processor, that
  57.          * issued the 'halt' command, so proceed to read the character
  58.          * directly from input
  59.          */
  60.         if (chardev->op->read)
  61.             return chardev->op->read(chardev);
  62.         /* no other way of interacting with user, halt */
  63.         printf("cpu: halted - no kconsole\n");
  64.         cpu_halt();
  65.     }
  66.  
  67.     waitq_sleep(&chardev->wq);
  68.     ipl = interrupts_disable();
  69.     spinlock_lock(&chardev->lock);
  70.     ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN];
  71.     chardev->counter--;
  72.     spinlock_unlock(&chardev->lock);
  73.     interrupts_restore(ipl);
  74.  
  75.     chardev->op->resume(chardev);
  76.  
  77.     return ch;
  78. }
  79.  
  80. /** Get string from character device.
  81.  *
  82.  * Read characters from character device until first occurrence
  83.  * of newline character.
  84.  *
  85.  * @param chardev Character device.
  86.  * @param buf Buffer where to store string terminated by '\0'.
  87.  * @param len Size of the buffer.
  88.  *
  89.  * @return Number of characters read.
  90.  */
  91. count_t gets(chardev_t *chardev, char *buf, size_t buflen)
  92. {
  93.     index_t index = 0;
  94.     char ch;
  95.  
  96.     while (index < buflen) {
  97.         ch = _getc(chardev);
  98.         if (ch == '\b') {
  99.             if (index > 0) {
  100.                 index--;
  101.                 /* Space backspace, space */
  102.                 putchar('\b');
  103.                 putchar(' ');
  104.                 putchar('\b');
  105.             }
  106.             continue;
  107.         }
  108.         putchar(ch);
  109.  
  110.         if (ch == '\n') { /* end of string => write 0, return */
  111.             buf[index] = '\0';
  112.             return (count_t) index;
  113.         }
  114.         buf[index++] = ch;
  115.     }
  116.     return (count_t) index;
  117. }
  118.  
  119. /** Get character from device & echo it to screen */
  120. __u8 getc(chardev_t *chardev)
  121. {
  122.     __u8 ch;
  123.  
  124.     ch = _getc(chardev);
  125.     putchar(ch);
  126.     return ch;
  127. }
  128.  
  129. void putchar(char c)
  130. {
  131.     if (stdout->op->write)
  132.         stdout->op->write(stdout, c);
  133. }
  134.