Rev 511 | Rev 532 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 510 | jermar | 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 | |||
| 41 | /** Get string from character device. |
||
| 42 | * |
||
| 43 | * Read characters from character device until first occurrence |
||
| 44 | * of newline character. |
||
| 45 | * |
||
| 46 | * @param chardev Character device. |
||
| 517 | jermar | 47 | * @param buf Buffer where to store string terminated by '\0'. |
| 510 | jermar | 48 | * @param len Size of the buffer. |
| 517 | jermar | 49 | * |
| 50 | * @return Number of characters read. |
||
| 510 | jermar | 51 | */ |
| 517 | jermar | 52 | count_t gets(chardev_t *chardev, char *buf, size_t buflen) |
| 510 | jermar | 53 | { |
| 54 | index_t index = 0; |
||
| 55 | char ch; |
||
| 56 | |||
| 57 | while (index < buflen) { |
||
| 58 | ch = getc(chardev); |
||
| 59 | if (ch == '\n') { /* end of string => write 0, return */ |
||
| 517 | jermar | 60 | buf[index] = '\0'; |
| 61 | return (count_t) index; |
||
| 510 | jermar | 62 | } |
| 517 | jermar | 63 | buf[index++] = ch; |
| 510 | jermar | 64 | } |
| 517 | jermar | 65 | return (count_t) index; |
| 510 | jermar | 66 | } |
| 67 | |||
| 68 | /** Get character from character device. |
||
| 69 | * |
||
| 70 | * @param chardev Character device. |
||
| 71 | * |
||
| 72 | * @return Character read. |
||
| 73 | */ |
||
| 74 | __u8 getc(chardev_t *chardev) |
||
| 75 | { |
||
| 76 | __u8 ch; |
||
| 77 | ipl_t ipl; |
||
| 78 | |||
| 79 | waitq_sleep(&chardev->wq); |
||
| 80 | ipl = interrupts_disable(); |
||
| 81 | spinlock_lock(&chardev->lock); |
||
| 82 | ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN]; |
||
| 83 | chardev->counter--; |
||
| 84 | spinlock_unlock(&chardev->lock); |
||
| 85 | interrupts_restore(ipl); |
||
| 86 | |||
| 511 | jermar | 87 | chardev->op->resume(); |
| 510 | jermar | 88 | |
| 89 | return ch; |
||
| 90 | } |