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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. #include <arch/atomic.h>
  40.  
  41. /** Standard input character device. */
  42. chardev_t *stdin = NULL;
  43. chardev_t *stdout = NULL;
  44.  
  45. /** Get character from character device. Do not echo character.
  46.  *
  47.  * @param chardev Character device.
  48.  *
  49.  * @return Character read.
  50.  */
  51. __u8 _getc(chardev_t *chardev)
  52. {
  53.     __u8 ch;
  54.     ipl_t ipl;
  55.  
  56.     if (atomic_get(&haltstate)) {
  57.         /* If we are here, we are hopefully on the processor, that
  58.          * issued the 'halt' command, so proceed to read the character
  59.          * directly from input
  60.          */
  61.         if (chardev->op->read)
  62.             return chardev->op->read(chardev);
  63.         /* no other way of interacting with user, halt */
  64.         if (CPU)
  65.             printf("cpu%d: ", CPU->id);
  66.         else
  67.             printf("cpu: ");
  68.         printf("halted - no kconsole\n");
  69.         cpu_halt();
  70.     }
  71.  
  72.     waitq_sleep(&chardev->wq);
  73.     ipl = interrupts_disable();
  74.     spinlock_lock(&chardev->lock);
  75.     ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN];
  76.     chardev->counter--;
  77.     spinlock_unlock(&chardev->lock);
  78.     interrupts_restore(ipl);
  79.  
  80.     chardev->op->resume(chardev);
  81.  
  82.     return ch;
  83. }
  84.  
  85. /** Get string from character device.
  86.  *
  87.  * Read characters from character device until first occurrence
  88.  * of newline character.
  89.  *
  90.  * @param chardev Character device.
  91.  * @param buf Buffer where to store string terminated by '\0'.
  92.  * @param len Size of the buffer.
  93.  *
  94.  * @return Number of characters read.
  95.  */
  96. count_t gets(chardev_t *chardev, char *buf, size_t buflen)
  97. {
  98.     index_t index = 0;
  99.     char ch;
  100.  
  101.     while (index < buflen) {
  102.         ch = _getc(chardev);
  103.         if (ch == '\b') {
  104.             if (index > 0) {
  105.                 index--;
  106.                 /* Space backspace, space */
  107.                 putchar('\b');
  108.                 putchar(' ');
  109.                 putchar('\b');
  110.             }
  111.             continue;
  112.         }
  113.         putchar(ch);
  114.  
  115.         if (ch == '\n') { /* end of string => write 0, return */
  116.             buf[index] = '\0';
  117.             return (count_t) index;
  118.         }
  119.         buf[index++] = ch;
  120.     }
  121.     return (count_t) index;
  122. }
  123.  
  124. /** Get character from device & echo it to screen */
  125. __u8 getc(chardev_t *chardev)
  126. {
  127.     __u8 ch;
  128.  
  129.     ch = _getc(chardev);
  130.     putchar(ch);
  131.     return ch;
  132. }
  133.  
  134. void putchar(char c)
  135. {
  136.     if (stdout->op->write)
  137.         stdout->op->write(stdout, c);
  138. }
  139.