WebSVN – HelenOS-historic – Diff – /kernel/trunk/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;
chardev_t *stdout = NULL;
 
/** Get character from character device. Do not echo character.
 *
 * @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(chardev);
 
    return ch;
}
 
/** 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 == '\b') {
            if (index > 0) {
                index--;
                /* Space backspace, space */
                putchar('\b');
                putchar(' ');
                putchar('\b');
            }
            continue;
        }
        putchar(ch);
 
        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 device & echo it to screen */
__u8 getc(chardev_t *chardev)
{
    __u8 ch;
 
    ch = _getc(chardev);
    putchar(ch);
    return ch;
}
 
void putchar(char c)
{
    stdout->op->write(stdout, c);
}
 

Rev 588	Rev 601
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	chardev_t *stdout = NULL;	40	chardev_t *stdout = NULL;
41		41
42	/** Get character from character device.	42	/** Get character from character device. Do not echo character.
43	*	43	*
44	* @param chardev Character device.	44	* @param chardev Character device.
45	*	45	*
46	* @return Character read.	46	* @return Character read.
47	*/	47	*/
48	static __u8 _getc(chardev_t *chardev)	48	__u8 _getc(chardev_t *chardev)
49	{	49	{
50	__u8 ch;	50	__u8 ch;
51	ipl_t ipl;	51	ipl_t ipl;
52		52
53	waitq_sleep(&chardev->wq);	53	waitq_sleep(&chardev->wq);
54	ipl = interrupts_disable();	54	ipl = interrupts_disable();
55	spinlock_lock(&chardev->lock);	55	spinlock_lock(&chardev->lock);
56	ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN];	56	ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN];
57	chardev->counter--;	57	chardev->counter--;
58	spinlock_unlock(&chardev->lock);	58	spinlock_unlock(&chardev->lock);
59	interrupts_restore(ipl);	59	interrupts_restore(ipl);
60		60
61	chardev->op->resume(chardev);	61	chardev->op->resume(chardev);
62		62
63	return ch;	63	return ch;
64	}	64	}
65		65
66	/** Get string from character device.	66	/** Get string from character device.
67	*	67	*
68	* Read characters from character device until first occurrence	68	* Read characters from character device until first occurrence
69	* of newline character.	69	* of newline character.
70	*	70	*
71	* @param chardev Character device.	71	* @param chardev Character device.
72	* @param buf Buffer where to store string terminated by '\0'.	72	* @param buf Buffer where to store string terminated by '\0'.
73	* @param len Size of the buffer.	73	* @param len Size of the buffer.
74	*	74	*
75	* @return Number of characters read.	75	* @return Number of characters read.
76	*/	76	*/
77	count_t gets(chardev_t chardev, char buf, size_t buflen)	77	count_t gets(chardev_t chardev, char buf, size_t buflen)
78	{	78	{
79	index_t index = 0;	79	index_t index = 0;
80	char ch;	80	char ch;
81		81
82	while (index < buflen) {	82	while (index < buflen) {
83	ch = _getc(chardev);	83	ch = _getc(chardev);
84	if (ch == '\b') {	84	if (ch == '\b') {
85	if (index > 0) {	85	if (index > 0) {
86	index--;	86	index--;
87	/* Space backspace, space */	87	/* Space backspace, space */
88	putchar('\b');	88	putchar('\b');
89	putchar(' ');	89	putchar(' ');
90	putchar('\b');	90	putchar('\b');
91	}	91	}
92	continue;	92	continue;
93	}	93	}
94	putchar(ch);	94	putchar(ch);
95		95
96	if (ch == '\n') { /* end of string => write 0, return */	96	if (ch == '\n') { /* end of string => write 0, return */
97	buf[index] = '\0';	97	buf[index] = '\0';
98	return (count_t) index;	98	return (count_t) index;
99	}	99	}
100	buf[index++] = ch;	100	buf[index++] = ch;
101	}	101	}
102	return (count_t) index;	102	return (count_t) index;
103	}	103	}
104		104
105	/** Get character from device & echo it to screen */	105	/** Get character from device & echo it to screen */
106	__u8 getc(chardev_t *chardev)	106	__u8 getc(chardev_t *chardev)
107	{	107	{
108	__u8 ch;	108	__u8 ch;
109		109
110	ch = _getc(chardev);	110	ch = _getc(chardev);
111	putchar(ch);	111	putchar(ch);
112	return ch;	112	return ch;
113	}	113	}
114		114
115	void putchar(char c)	115	void putchar(char c)
116	{	116	{
117	stdout->op->write(stdout, c);	117	stdout->op->write(stdout, c);
118	}	118	}
119		119

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/generic/src/console/console.c – Rev 588 → 601