WebSVN – HelenOS – Diff – /branches/sparc/kernel/generic/src/console/console.c


/*
 * 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;
}
 

Rev 511	Rev 517
1	/*	1	/*
2	* Copyright (C) 2003 Josef Cejka	2	* Copyright (C) 2003 Josef Cejka
3	* Copyright (C) 2005 Jakub Jermar	3	* Copyright (C) 2005 Jakub Jermar
4	* All rights reserved.	4	* All rights reserved.
5	*	5	*
6	* Redistribution and use in source and binary forms, with or without	6	* Redistribution and use in source and binary forms, with or without
7	* modification, are permitted provided that the following conditions	7	* modification, are permitted provided that the following conditions
8	* are met:	8	* are met:
9	*	9	*
10	* - Redistributions of source code must retain the above copyright	10	* - Redistributions of source code must retain the above copyright
11	* notice, this list of conditions and the following disclaimer.	11	* notice, this list of conditions and the following disclaimer.
12	* - Redistributions in binary form must reproduce the above copyright	12	* - Redistributions in binary form must reproduce the above copyright
13	* notice, this list of conditions and the following disclaimer in the	13	* notice, this list of conditions and the following disclaimer in the
14	* documentation and/or other materials provided with the distribution.	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	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.	16	* derived from this software without specific prior written permission.
17	*	17	*
18	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	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	19	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	20	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	21	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	22	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	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	24	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	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	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.	27	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28	*/	28	*/
29		29
30	#include <console/console.h>	30	#include <console/console.h>
31	#include <console/chardev.h>	31	#include <console/chardev.h>
32	#include <synch/waitq.h>	32	#include <synch/waitq.h>
33	#include <synch/spinlock.h>	33	#include <synch/spinlock.h>
34	#include <arch/types.h>	34	#include <arch/types.h>
35	#include <typedefs.h>	35	#include <typedefs.h>
36	#include <arch.h>	36	#include <arch.h>
37		37
38	/** Standard input character device. */	38	/** Standard input character device. */
39	chardev_t *stdin = NULL;	39	chardev_t *stdin = NULL;
40		40
41	/** Get string from character device.	41	/** Get string from character device.
42	*	42	*
43	* Read characters from character device until first occurrence	43	* Read characters from character device until first occurrence
44	* of newline character.	44	* of newline character.
45	*	45	*
46	* @param chardev Character device.	46	* @param chardev Character device.
47	* @param string Buffer where to store string terminated by '\0'.	47	* @param buf Buffer where to store string terminated by '\0'.
48	* @param len Size of the buffer.	48	* @param len Size of the buffer.
-		49	*
-		50	* @return Number of characters read.
49	*/	51	*/
50	void gets(chardev_t chardev, __u8 string, size_t buflen)	52	count_t gets(chardev_t chardev, char buf, size_t buflen)
51	{	53	{
52	index_t index = 0;	54	index_t index = 0;
53	char ch;	55	char ch;
54		56
55	while (index < buflen) {	57	while (index < buflen) {
56	ch = getc(chardev);	58	ch = getc(chardev);
57	if (ch == '\n') { /* end of string => write 0, return */	59	if (ch == '\n') { /* end of string => write 0, return */
58	string[index] = '\0';	60	buf[index] = '\0';
59	return;	61	return (count_t) index;
60	}	62	}
61	string[index++] = ch;	63	buf[index++] = ch;
62	}	64	}
63	return;	65	return (count_t) index;
64	}	66	}
65		67
66	/** Get character from character device.	68	/** Get character from character device.
67	*	69	*
68	* @param chardev Character device.	70	* @param chardev Character device.
69	*	71	*
70	* @return Character read.	72	* @return Character read.
71	*/	73	*/
72	__u8 getc(chardev_t *chardev)	74	__u8 getc(chardev_t *chardev)
73	{	75	{
74	__u8 ch;	76	__u8 ch;
75	ipl_t ipl;	77	ipl_t ipl;
76		78
77	waitq_sleep(&chardev->wq);	79	waitq_sleep(&chardev->wq);
78	ipl = interrupts_disable();	80	ipl = interrupts_disable();
79	spinlock_lock(&chardev->lock);	81	spinlock_lock(&chardev->lock);
80	ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN];	82	ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN];
81	chardev->counter--;	83	chardev->counter--;
82	spinlock_unlock(&chardev->lock);	84	spinlock_unlock(&chardev->lock);
83	interrupts_restore(ipl);	85	interrupts_restore(ipl);
84		86
85	chardev->op->resume();	87	chardev->op->resume();
86		88
87	return ch;	89	return ch;
88	}	90	}
89		91

Subversion Repositories HelenOS

(root)/branches/sparc/kernel/generic/src/console/console.c @ 3862 – Rev 511 → 517