| 0,0 → 1,90 |
|---|
| /* |
| * Copyright (C) 2003 Josef Cejka |
| * Copyright (C) 2005 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. |
| */ |
| |
| #include <console/console.h> |
| #include <console/chardev.h> |
| #include <synch/waitq.h> |
| #include <synch/spinlock.h> |
| #include <arch/types.h> |
| #include <typedefs.h> |
| #include <arch.h> |
| |
| /** Standard input character device. */ |
| chardev_t *stdin = NULL; |
| |
| /** Get string from character device. |
| * |
| * Read characters from character device until first occurrence |
| * of newline character. |
| * |
| * @param chardev Character device. |
| * @param buf Buffer where to store string terminated by '\0'. |
| * @param len Size of the buffer. |
| * |
| * @return Number of characters read. |
| */ |
| count_t gets(chardev_t *chardev, char *buf, size_t buflen) |
| { |
| index_t index = 0; |
| char ch; |
| |
| while (index < buflen) { |
| ch = getc(chardev); |
| if (ch == '\n') { /* end of string => write 0, return */ |
| buf[index] = '\0'; |
| return (count_t) index; |
| } |
| buf[index++] = ch; |
| } |
| return (count_t) index; |
| } |
| |
| /** Get character from character device. |
| * |
| * @param chardev Character device. |
| * |
| * @return Character read. |
| */ |
| __u8 getc(chardev_t *chardev) |
| { |
| __u8 ch; |
| ipl_t ipl; |
| |
| waitq_sleep(&chardev->wq); |
| ipl = interrupts_disable(); |
| spinlock_lock(&chardev->lock); |
| ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN]; |
| chardev->counter--; |
| spinlock_unlock(&chardev->lock); |
| interrupts_restore(ipl); |
| |
| chardev->op->resume(); |
| |
| return ch; |
| } |