WebSVN – HelenOS-historic – Diff – /kernel/trunk/generic/src/lib/func.c


/*
 * Copyright (C) 2001-2004 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.
 */
 
/**
 * @file    func.c
 * @brief   Miscellaneous functions.
 */
 
#include <func.h>
#include <print.h>
#include <cpu.h>
#include <arch/asm.h>
#include <arch.h>
#include <typedefs.h>
#include <console/kconsole.h>
 
atomic_t haltstate = {0}; /**< Halt flag */
 
 
/** Halt wrapper
 *
 * Set halt flag and halt the cpu.
 *
 */
void halt()
{
#ifdef CONFIG_DEBUG
    bool rundebugger = false;
 
//      TODO test_and_set not defined on all arches
//  if (!test_and_set(&haltstate))
    if (!atomic_get(&haltstate)) {
        atomic_set(&haltstate, 1);
        rundebugger = true;
    }
#else
    atomic_set(&haltstate, 1);
#endif
 
    interrupts_disable();
#ifdef CONFIG_DEBUG
    if (rundebugger) {
        printf("\n");
        kconsole("panic"); /* Run kconsole as a last resort to user */
    }
#endif      
    if (CPU)
        printf("cpu%d: halted\n", CPU->id);
    else
        printf("cpu: halted\n");
    cpu_halt();
}
 
/** Return number of characters in a string.
 *
 * @param str NULL terminated string.
 *
 * @return Number of characters in str.
 */
size_t strlen(const char *str)
{
    int i;
   
    for (i = 0; str[i]; i++)
        ;
   
    return i;
}
 
/** Compare two NULL terminated strings
 *
 * Do a char-by-char comparison of two NULL terminated strings.
 * The strings are considered equal iff they consist of the same
 * characters on the minimum of their lengths and specified maximal
 * length.
 *
 * @param src First string to compare.
 * @param dst Second string to compare.
 * @param len Maximal length for comparison.
 *
 * @return 0 if the strings are equal, -1 if first is smaller, 1 if second smaller.
 *
 */
int strncmp(const char *src, const char *dst, size_t len)
{
    int i;
   
    i = 0;
    for (;*src && *dst && i < len;src++,dst++,i++) {
        if (*src < *dst)
            return -1;
        if (*src > *dst)
            return 1;
    }
    if (i == len || *src == *dst)
        return 0;
    if (!*src)
        return -1;
    return 1;
}
 
/** Copy NULL terminated string.
 *
 * Copy at most 'len' characters from string 'src' to 'dest'.
 * If 'src' is shorter than 'len', '\0' is inserted behind the
 * last copied character.
 *
 * @param src Source string.
 * @param dst Destination buffer.
 * @param len Size of destination buffer.
 */
void strncpy(char *dest, const char *src, size_t len)
{
    int i;
    for (i = 0; i < len; i++) {
        if (!(dest[i] = src[i]))
            return;
    }
    dest[i-1] = '\0';
}
 
/** Convert ascii representation to __native
 *
 * Supports 0x for hexa & 0 for octal notation.
 * Does not check for overflows, does not support negative numbers
 *
 * @param text Textual representation of number
 * @return Converted number or 0 if no valid number ofund
 */
__native atoi(const char *text)
{
    int base = 10;
    __native result = 0;
 
    if (text[0] == '0' && text[1] == 'x') {
        base = 16;
        text += 2;
    } else if (text[0] == '0')
        base = 8;
 
    while (*text) {
        if (base != 16 && \
            ((*text >= 'A' && *text <= 'F' )
             || (*text >='a' && *text <='f')))
            break;
        if (base == 8 && *text >='8')
            break;
 
        if (*text >= '0' && *text <= '9') {
            result *= base;
            result += *text - '0';
        } else if (*text >= 'A' && *text <= 'F') {
            result *= base;
            result += *text - 'A' + 10;
        } else if (*text >= 'a' && *text <= 'f') {
            result *= base;
            result += *text - 'a' + 10;
        } else
            break;
        text++;
    }
 
    return result;
}
 

Rev 1100	Rev 1264
1	/*	1	/*
2	* Copyright (C) 2001-2004 Jakub Jermar	2	* Copyright (C) 2001-2004 Jakub Jermar
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
-		29	/**
-		30	* @file func.c
-		31	* @brief Miscellaneous functions.
-		32	*/
-		33
29	#include <func.h>	34	#include <func.h>
30	#include <print.h>	35	#include <print.h>
31	#include <cpu.h>	36	#include <cpu.h>
32	#include <arch/asm.h>	37	#include <arch/asm.h>
33	#include <arch.h>	38	#include <arch.h>
34	#include <typedefs.h>	39	#include <typedefs.h>
35	#include <console/kconsole.h>	40	#include <console/kconsole.h>
36		41
37	atomic_t haltstate = {0}; /*< Halt flag /	42	atomic_t haltstate = {0}; /*< Halt flag /
38		43
39		44
40	/** Halt wrapper	45	/** Halt wrapper
41	*	46	*
42	* Set halt flag and halt the cpu.	47	* Set halt flag and halt the cpu.
43	*	48	*
44	*/	49	*/
45	void halt()	50	void halt()
46	{	51	{
47	#ifdef CONFIG_DEBUG	52	#ifdef CONFIG_DEBUG
48	bool rundebugger = false;	53	bool rundebugger = false;
49		54
50	// TODO test_and_set not defined on all arches	55	// TODO test_and_set not defined on all arches
51	// if (!test_and_set(&haltstate))	56	// if (!test_and_set(&haltstate))
52	if (!atomic_get(&haltstate)) {	57	if (!atomic_get(&haltstate)) {
53	atomic_set(&haltstate, 1);	58	atomic_set(&haltstate, 1);
54	rundebugger = true;	59	rundebugger = true;
55	}	60	}
56	#else	61	#else
57	atomic_set(&haltstate, 1);	62	atomic_set(&haltstate, 1);
58	#endif	63	#endif
59		64
60	interrupts_disable();	65	interrupts_disable();
61	#ifdef CONFIG_DEBUG	66	#ifdef CONFIG_DEBUG
62	if (rundebugger) {	67	if (rundebugger) {
63	printf("\n");	68	printf("\n");
64	kconsole("panic"); /* Run kconsole as a last resort to user */	69	kconsole("panic"); /* Run kconsole as a last resort to user */
65	}	70	}
66	#endif	71	#endif
67	if (CPU)	72	if (CPU)
68	printf("cpu%d: halted\n", CPU->id);	73	printf("cpu%d: halted\n", CPU->id);
69	else	74	else
70	printf("cpu: halted\n");	75	printf("cpu: halted\n");
71	cpu_halt();	76	cpu_halt();
72	}	77	}
73		78
74	/** Return number of characters in a string.	79	/** Return number of characters in a string.
75	*	80	*
76	* @param str NULL terminated string.	81	* @param str NULL terminated string.
77	*	82	*
78	* @return Number of characters in str.	83	* @return Number of characters in str.
79	*/	84	*/
80	size_t strlen(const char *str)	85	size_t strlen(const char *str)
81	{	86	{
82	int i;	87	int i;
83		88
84	for (i = 0; str[i]; i++)	89	for (i = 0; str[i]; i++)
85	;	90	;
86		91
87	return i;	92	return i;
88	}	93	}
89		94
90	/** Compare two NULL terminated strings	95	/** Compare two NULL terminated strings
91	*	96	*
92	* Do a char-by-char comparison of two NULL terminated strings.	97	* Do a char-by-char comparison of two NULL terminated strings.
93	* The strings are considered equal iff they consist of the same	98	* The strings are considered equal iff they consist of the same
94	* characters on the minimum of their lengths and specified maximal	99	* characters on the minimum of their lengths and specified maximal
95	* length.	100	* length.
96	*	101	*
97	* @param src First string to compare.	102	* @param src First string to compare.
98	* @param dst Second string to compare.	103	* @param dst Second string to compare.
99	* @param len Maximal length for comparison.	104	* @param len Maximal length for comparison.
100	*	105	*
101	* @return 0 if the strings are equal, -1 if first is smaller, 1 if second smaller.	106	* @return 0 if the strings are equal, -1 if first is smaller, 1 if second smaller.
102	*	107	*
103	*/	108	*/
104	int strncmp(const char src, const char dst, size_t len)	109	int strncmp(const char src, const char dst, size_t len)
105	{	110	{
106	int i;	111	int i;
107		112
108	i = 0;	113	i = 0;
109	for (;src && dst && i < len;src++,dst++,i++) {	114	for (;src && dst && i < len;src++,dst++,i++) {
110	if (src < dst)	115	if (src < dst)
111	return -1;	116	return -1;
112	if (src > dst)	117	if (src > dst)
113	return 1;	118	return 1;
114	}	119	}
115	if (i == len \|\| src == dst)	120	if (i == len \|\| src == dst)
116	return 0;	121	return 0;
117	if (!*src)	122	if (!*src)
118	return -1;	123	return -1;
119	return 1;	124	return 1;
120	}	125	}
121		126
122	/** Copy NULL terminated string.	127	/** Copy NULL terminated string.
123	*	128	*
124	* Copy at most 'len' characters from string 'src' to 'dest'.	129	* Copy at most 'len' characters from string 'src' to 'dest'.
125	* If 'src' is shorter than 'len', '\0' is inserted behind the	130	* If 'src' is shorter than 'len', '\0' is inserted behind the
126	* last copied character.	131	* last copied character.
127	*	132	*
128	* @param src Source string.	133	* @param src Source string.
129	* @param dst Destination buffer.	134	* @param dst Destination buffer.
130	* @param len Size of destination buffer.	135	* @param len Size of destination buffer.
131	*/	136	*/
132	void strncpy(char dest, const char src, size_t len)	137	void strncpy(char dest, const char src, size_t len)
133	{	138	{
134	int i;	139	int i;
135	for (i = 0; i < len; i++) {	140	for (i = 0; i < len; i++) {
136	if (!(dest[i] = src[i]))	141	if (!(dest[i] = src[i]))
137	return;	142	return;
138	}	143	}
139	dest[i-1] = '\0';	144	dest[i-1] = '\0';
140	}	145	}
141		146
142	/** Convert ascii representation to __native	147	/** Convert ascii representation to __native
143	*	148	*
144	* Supports 0x for hexa & 0 for octal notation.	149	* Supports 0x for hexa & 0 for octal notation.
145	* Does not check for overflows, does not support negative numbers	150	* Does not check for overflows, does not support negative numbers
146	*	151	*
147	* @param text Textual representation of number	152	* @param text Textual representation of number
148	* @return Converted number or 0 if no valid number ofund	153	* @return Converted number or 0 if no valid number ofund
149	*/	154	*/
150	__native atoi(const char *text)	155	__native atoi(const char *text)
151	{	156	{
152	int base = 10;	157	int base = 10;
153	__native result = 0;	158	__native result = 0;
154		159
155	if (text[0] == '0' && text[1] == 'x') {	160	if (text[0] == '0' && text[1] == 'x') {
156	base = 16;	161	base = 16;
157	text += 2;	162	text += 2;
158	} else if (text[0] == '0')	163	} else if (text[0] == '0')
159	base = 8;	164	base = 8;
160		165
161	while (*text) {	166	while (*text) {
162	if (base != 16 && \	167	if (base != 16 && \
163	((text >= 'A' && text <= 'F' )	168	((text >= 'A' && text <= 'F' )
164	\|\| (text >='a' && text <='f')))	169	\|\| (text >='a' && text <='f')))
165	break;	170	break;
166	if (base == 8 && *text >='8')	171	if (base == 8 && *text >='8')
167	break;	172	break;
168		173
169	if (text >= '0' && text <= '9') {	174	if (text >= '0' && text <= '9') {
170	result *= base;	175	result *= base;
171	result += *text - '0';	176	result += *text - '0';
172	} else if (text >= 'A' && text <= 'F') {	177	} else if (text >= 'A' && text <= 'F') {
173	result *= base;	178	result *= base;
174	result += *text - 'A' + 10;	179	result += *text - 'A' + 10;
175	} else if (text >= 'a' && text <= 'f') {	180	} else if (text >= 'a' && text <= 'f') {
176	result *= base;	181	result *= base;
177	result += *text - 'a' + 10;	182	result += *text - 'a' + 10;
178	} else	183	} else
179	break;	184	break;
180	text++;	185	text++;
181	}	186	}
182		187
183	return result;	188	return result;
184	}	189	}
185		190

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/generic/src/lib/func.c – Rev 1100 → 1264