WebSVN – HelenOS – Diff – /branches/dd/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';
}
 
/** Copy string.
 *
 * Copy string from src address to dst address.  The copying is done
 * char-by-char until the null character. The source and destination memory
 * areas cannot overlap.
 *
 * @param src       Source string to copy from.
 * @param dst       Destination string to copy to.
 *
 * @return      Address of the destination string.
 */
char *strcpy(char *dest, const char *src)
{
    char *orig = dest;
   
    while ((*dest++ = *src++) != '\0');
 
    return orig;
}
 
/** 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;
}
 
/** Find last 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 *strrchr(const char *s, int i)
{
    const char *start;
 
    start = s;
    if (*s == '\0') return NULL;
 
    while (*s != '\0') ++s;
 
    while (s != start) {
        --s;
        if (*s == i) return (char *) s;
    }
 
    return NULL;
}
 
/** @}
 */
 

Rev 4011	Rev 4012
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	size_t strlen(const char *str)	51	size_t strlen(const char *str)
52	{	52	{
53	int i;	53	int i;
54		54
55	for (i = 0; str[i]; i++)	55	for (i = 0; str[i]; i++)
56	;	56	;
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	if (!*src)	83	if (!*src)
84	return -1;	84	return -1;
85	return 1;	85	return 1;
86	}	86	}
87		87
88		88
89	/** Compare two NULL terminated strings	89	/** Compare two NULL terminated strings
90	*	90	*
91	* Do a char-by-char comparison of two NULL terminated strings.	91	* Do a char-by-char comparison of two NULL terminated strings.
92	* The strings are considered equal iff they consist of the same	92	* The strings are considered equal iff they consist of the same
93	* characters on the minimum of their lengths and specified maximal	93	* characters on the minimum of their lengths and specified maximal
94	* length.	94	* length.
95	*	95	*
96	* @param src First string to compare.	96	* @param src First string to compare.
97	* @param dst Second string to compare.	97	* @param dst Second string to compare.
98	* @param len Maximal length for comparison.	98	* @param len Maximal length for comparison.
99	*	99	*
100	* @return 0 if the strings are equal, -1 if first is smaller, 1 if second smaller.	100	* @return 0 if the strings are equal, -1 if first is smaller, 1 if second smaller.
101	*	101	*
102	*/	102	*/
103	int strncmp(const char src, const char dst, size_t len)	103	int strncmp(const char src, const char dst, size_t len)
104	{	104	{
105	unsigned int i;	105	unsigned int i;
106		106
107	for (i = 0; (src) && (dst) && (i < len); src++, dst++, i++) {	107	for (i = 0; (src) && (dst) && (i < len); src++, dst++, i++) {
108	if (src < dst)	108	if (src < dst)
109	return -1;	109	return -1;
110	if (src > dst)	110	if (src > dst)
111	return 1;	111	return 1;
112	}	112	}
113	if (i == len \|\| src == dst)	113	if (i == len \|\| src == dst)
114	return 0;	114	return 0;
115	if (!*src)	115	if (!*src)
116	return -1;	116	return -1;
117	return 1;	117	return 1;
118	}	118	}
119		119
120		120
121		121
122	/** Copy NULL terminated string.	122	/** Copy NULL terminated string.
123	*	123	*
124	* Copy at most 'len' characters from string 'src' to 'dest'.	124	* Copy at most 'len' characters from string 'src' to 'dest'.
125	* If 'src' is shorter than 'len', '\0' is inserted behind the	125	* If 'src' is shorter than 'len', '\0' is inserted behind the
126	* last copied character.	126	* last copied character.
127	*	127	*
128	* @param src Source string.	128	* @param src Source string.
129	* @param dest Destination buffer.	129	* @param dest Destination buffer.
130	* @param len Size of destination buffer.	130	* @param len Size of destination buffer.
131	*/	131	*/
132	void strncpy(char dest, const char src, size_t len)	132	void strncpy(char dest, const char src, size_t len)
133	{	133	{
134	unsigned int i;	134	unsigned int i;
135		135
136	for (i = 0; i < len; i++) {	136	for (i = 0; i < len; i++) {
137	if (!(dest[i] = src[i]))	137	if (!(dest[i] = src[i]))
138	return;	138	return;
139	}	139	}
140		140
141	dest[i - 1] = '\0';	141	dest[i - 1] = '\0';
142	}	142	}
143		143
144	/** Copy string.	144	/** Copy string.
145	*	145	*
146	* Copy string from src address to dst address. The copying is done	146	* Copy string from src address to dst address. The copying is done
147	* char-by-char until the null character. The source and destination memory	147	* char-by-char until the null character. The source and destination memory
148	* areas cannot overlap.	148	* areas cannot overlap.
149	*	149	*
150	* @param src Source string to copy from.	150	* @param src Source string to copy from.
151	* @param dst Destination string to copy to.	151	* @param dst Destination string to copy to.
152	*	152	*
153	* @return Address of the destination string.	153	* @return Address of the destination string.
154	*/	154	*/
155	char strcpy(char dest, const char *src)	155	char strcpy(char dest, const char *src)
156	{	156	{
157	char *orig = dest;	157	char *orig = dest;
158		158
159	while ((dest++ = src++) != '\0');	159	while ((dest++ = src++) != '\0');
160		160
161	return orig;	161	return orig;
162	}	162	}
163		163
-		164	/** Find first occurence of character in string.
-		165	*
-		166	* @param s String to search.
-		167	* @param i Character to look for.
-		168	*
-		169	* @return Pointer to character in @a s or NULL if not found.
-		170	*/
-		171	extern char strchr(const char s, int i)
-		172	{
-		173	while (*s != '\0') {
-		174	if (s == i) return (char ) s;
-		175	++s;
-		176	}
-		177
-		178	return NULL;
-		179	}
-		180
-		181	/** Find last occurence of character in string.
-		182	*
-		183	* @param s String to search.
-		184	* @param i Character to look for.
-		185	*
-		186	* @return Pointer to character in @a s or NULL if not found.
-		187	*/
-		188	extern char strrchr(const char s, int i)
-		189	{
-		190	const char *start;
-		191
-		192	start = s;
-		193	if (*s == '\0') return NULL;
-		194
-		195	while (*s != '\0') ++s;
-		196
-		197	while (s != start) {
-		198	--s;
-		199	if (s == i) return (char ) s;
-		200	}
-		201
-		202	return NULL;
-		203	}
-		204
164	/** @}	205	/** @}
165	*/	206	*/
166		207

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(root)/branches/dd/kernel/generic/src/lib/string.c @ 4688 – Rev 4011 → 4012