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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.  
  38. /** Standard input character device. */
  39. chardev_t *stdin = NULL;
  40. chardev_t *stdout = NULL;
  41.  
  42. /** Get character from character device.
  43.  *
  44.  * @param chardev Character device.
  45.  *
  46.  * @return Character read.
  47.  */
  48. static __u8 _getc(chardev_t *chardev)
  49. {
  50.     __u8 ch;
  51.     ipl_t ipl;
  52.  
  53.     waitq_sleep(&chardev->wq);
  54.     ipl = interrupts_disable();
  55.     spinlock_lock(&chardev->lock);
  56.     ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN];
  57.     chardev->counter--;
  58.     spinlock_unlock(&chardev->lock);
  59.     interrupts_restore(ipl);
  60.  
  61.     chardev->op->resume(chardev);
  62.  
  63.     return ch;
  64. }
  65.  
  66. /** Get string from character device.
  67.  *
  68.  * Read characters from character device until first occurrence
  69.  * of newline character.
  70.  *
  71.  * @param chardev Character device.
  72.  * @param buf Buffer where to store string terminated by '\0'.
  73.  * @param len Size of the buffer.
  74.  *
  75.  * @return Number of characters read.
  76.  */
  77. count_t gets(chardev_t *chardev, char *buf, size_t buflen)
  78. {
  79.     index_t index = 0;
  80.     char ch;
  81.  
  82.     while (index < buflen) {
  83.         ch = _getc(chardev);
  84.         if (ch == '\b') {
  85.             if (index > 0) {
  86.                 index--;
  87.                 /* Space backspace, space */
  88.                 putchar('\b');
  89.                 putchar(' ');
  90.                 putchar('\b');
  91.             }
  92.             continue;
  93.         }
  94.         putchar(ch);
  95.  
  96.         if (ch == '\n') { /* end of string => write 0, return */
  97.             buf[index] = '\0';
  98.             return (count_t) index;
  99.         }
  100.         buf[index++] = ch;
  101.     }
  102.     return (count_t) index;
  103. }
  104.  
  105. /** Get character from device & echo it to screen */
  106. __u8 getc(chardev_t *chardev)
  107. {
  108.     __u8 ch;
  109.  
  110.     ch = _getc(chardev);
  111.     putchar(ch);
  112.     return ch;
  113. }
  114.  
  115. void putchar(char c)
  116. {
  117.     stdout->op->write(stdout, c);
  118. }
  119.