WebSVN – HelenOS – Diff – /branches/dynload/kernel/generic/src/lib/string.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.
 */
 
/** @addtogroup generic
 * @{
 */
 
/**
 * @file
 * @brief Miscellaneous functions.
 */
 
#include <string.h>
#include <print.h>
#include <cpu.h>
#include <arch/asm.h>
#include <arch.h>
#include <console/kconsole.h>
 
/** 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.
 *
 * @param src First string to compare.
 * @param dst Second string to compare.
 *
 * @return 0 if the strings are equal, -1 if first is smaller, 1 if second smaller.
 *
 */
int strcmp(const char *src, const char *dst)
{
    for (; *src && *dst; src++, dst++) {
        if (*src < *dst)
            return -1;
        if (*src > *dst)
            return 1;
    }
    if (*src == *dst)
        return 0;
   
    if (!*src)
        return -1;
   
    return 1;
}
 
 
/** 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)
{
    unsigned int i;
   
    for (i = 0; (*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 dest Destination buffer.
 * @param len  Size of destination buffer.
 *
 */
void strncpy(char *dest, const char *src, size_t len)
{
    unsigned int i;
   
    for (i = 0; i < len; i++) {
        if (!(dest[i] = src[i]))
            return;
    }
   
    dest[i - 1] = '\0';
}
 
/** Find first occurence of character in string.
 *
 * @param s String to search.
 * @param i Character to look for.
 *
 * @return Pointer to character in @a s or NULL if not found.
 */
extern char *strchr(const char *s, int i)
{
    while (*s != '\0') {
        if (*s == i)
            return (char *) s;
        ++s;
    }
   
    return NULL;
}
 
/** @}
 */
 

Rev 4014	Rev 4345
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	/** @addtogroup generic	29	/** @addtogroup generic
30	* @{	30	* @{
31	*/	31	*/
32		32
33	/**	33	/**
34	* @file	34	* @file
35	* @brief Miscellaneous functions.	35	* @brief Miscellaneous functions.
36	*/	36	*/
37		37
38	#include <string.h>	38	#include <string.h>
39	#include <print.h>	39	#include <print.h>
40	#include <cpu.h>	40	#include <cpu.h>
41	#include <arch/asm.h>	41	#include <arch/asm.h>
42	#include <arch.h>	42	#include <arch.h>
43	#include <console/kconsole.h>	43	#include <console/kconsole.h>
44		44
45	/** Return number of characters in a string.	45	/** Return number of characters in a string.
46	*	46	*
47	* @param str NULL terminated string.	47	* @param str NULL terminated string.
48	*	48	*
49	* @return Number of characters in str.	49	* @return Number of characters in str.
50	*	50	*
51	*/	51	*/
52	size_t strlen(const char *str)	52	size_t strlen(const char *str)
53	{	53	{
54	int i;	54	int i;
55		55
56	for (i = 0; str[i]; i++);	56	for (i = 0; str[i]; i++);
57		57
58	return i;	58	return i;
59	}	59	}
60		60
61	/** Compare two NULL terminated strings	61	/** Compare two NULL terminated strings
62	*	62	*
63	* Do a char-by-char comparison of two NULL terminated strings.	63	* Do a char-by-char comparison of two NULL terminated strings.
64	* The strings are considered equal iff they consist of the same	64	* The strings are considered equal iff they consist of the same
65	* characters on the minimum of their lengths.	65	* characters on the minimum of their lengths.
66	*	66	*
67	* @param src First string to compare.	67	* @param src First string to compare.
68	* @param dst Second string to compare.	68	* @param dst Second string to compare.
69	*	69	*
70	* @return 0 if the strings are equal, -1 if first is smaller, 1 if second smaller.	70	* @return 0 if the strings are equal, -1 if first is smaller, 1 if second smaller.
71	*	71	*
72	*/	72	*/
73	int strcmp(const char src, const char dst)	73	int strcmp(const char src, const char dst)
74	{	74	{
75	for (; src && dst; src++, dst++) {	75	for (; src && dst; src++, dst++) {
76	if (src < dst)	76	if (src < dst)
77	return -1;	77	return -1;
78	if (src > dst)	78	if (src > dst)
79	return 1;	79	return 1;
80	}	80	}
81	if (src == dst)	81	if (src == dst)
82	return 0;	82	return 0;
83		83
84	if (!*src)	84	if (!*src)
85	return -1;	85	return -1;
86		86
87	return 1;	87	return 1;
88	}	88	}
89		89
90		90
91	/** Compare two NULL terminated strings	91	/** Compare two NULL terminated strings
92	*	92	*
93	* Do a char-by-char comparison of two NULL terminated strings.	93	* Do a char-by-char comparison of two NULL terminated strings.
94	* The strings are considered equal iff they consist of the same	94	* The strings are considered equal iff they consist of the same
95	* characters on the minimum of their lengths and specified maximal	95	* characters on the minimum of their lengths and specified maximal
96	* length.	96	* length.
97	*	97	*
98	* @param src First string to compare.	98	* @param src First string to compare.
99	* @param dst Second string to compare.	99	* @param dst Second string to compare.
100	* @param len Maximal length for comparison.	100	* @param len Maximal length for comparison.
101	*	101	*
102	* @return 0 if the strings are equal, -1 if first is smaller, 1 if second smaller.	102	* @return 0 if the strings are equal, -1 if first is smaller, 1 if second smaller.
103	*	103	*
104	*/	104	*/
105	int strncmp(const char src, const char dst, size_t len)	105	int strncmp(const char src, const char dst, size_t len)
106	{	106	{
107	unsigned int i;	107	unsigned int i;
108		108
109	for (i = 0; (src) && (dst) && (i < len); src++, dst++, i++) {	109	for (i = 0; (src) && (dst) && (i < len); src++, dst++, i++) {
110	if (src < dst)	110	if (src < dst)
111	return -1;	111	return -1;
112		112
113	if (src > dst)	113	if (src > dst)
114	return 1;	114	return 1;
115	}	115	}
116		116
117	if (i == len \|\| src == dst)	117	if (i == len \|\| src == dst)
118	return 0;	118	return 0;
119		119
120	if (!*src)	120	if (!*src)
121	return -1;	121	return -1;
122		122
123	return 1;	123	return 1;
124	}	124	}
125		125
126		126
127		127
128	/** Copy NULL terminated string.	128	/** Copy NULL terminated string.
129	*	129	*
130	* Copy at most 'len' characters from string 'src' to 'dest'.	130	* Copy at most 'len' characters from string 'src' to 'dest'.
131	* If 'src' is shorter than 'len', '\0' is inserted behind the	131	* If 'src' is shorter than 'len', '\0' is inserted behind the
132	* last copied character.	132	* last copied character.
133	*	133	*
134	* @param src Source string.	134	* @param src Source string.
135	* @param dest Destination buffer.	135	* @param dest Destination buffer.
136	* @param len Size of destination buffer.	136	* @param len Size of destination buffer.
137	*	137	*
138	*/	138	*/
139	void strncpy(char dest, const char src, size_t len)	139	void strncpy(char dest, const char src, size_t len)
140	{	140	{
141	unsigned int i;	141	unsigned int i;
142		142
143	for (i = 0; i < len; i++) {	143	for (i = 0; i < len; i++) {
144	if (!(dest[i] = src[i]))	144	if (!(dest[i] = src[i]))
145	return;	145	return;
146	}	146	}
147		147
148	dest[i - 1] = '\0';	148	dest[i - 1] = '\0';
149	}	149	}
150		150
151	/** Find first occurence of character in string.	151	/** Find first occurence of character in string.
152	*	152	*
153	* @param s String to search.	153	* @param s String to search.
154	* @param i Character to look for.	154	* @param i Character to look for.
155	*	155	*
156	* @return Pointer to character in @a s or NULL if not found.	156	* @return Pointer to character in @a s or NULL if not found.
157	*/	157	*/
158	extern char strchr(const char s, int i)	158	extern char strchr(const char s, int i)
159	{	159	{
160	while (*s != '\0') {	160	while (*s != '\0') {
161	if (*s == i)	161	if (*s == i)
162	return (char *) s;	162	return (char *) s;
163	++s;	163	++s;
164	}	164	}
165		165
166	return NULL;	166	return NULL;
167	}	167	}
168		168
169	/** @}	169	/** @}
170	*/	170	*/
171		171

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(root)/branches/dynload/kernel/generic/src/lib/string.c – Rev 4014 → 4345