WebSVN – HelenOS – Diff – /tags/0.2.0.4/uspace/libc/generic/string.c


/*
 * Copyright (c) 2005 Martin Decky
 * 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 libc
 * @{
 */
/** @file
 */
 
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <limits.h>
#include <align.h>
 
 
/* Dummy implementation of mem/ functions */
 
void *memset(void *s, int c, size_t n)
{
    char *os = s;
   
    while (n--)
        *(os++) = c;
   
    return s;
}
 
struct along {
    unsigned long n;
} __attribute__ ((packed));
 
static void *unaligned_memcpy(void *dst, const void *src, size_t n)
{
    int i, j;
    struct along *adst = dst;
    const struct along *asrc = src;
 
    for (i = 0; i < n / sizeof(unsigned long); i++)
        adst[i].n = asrc[i].n;
       
    for (j = 0; j < n % sizeof(unsigned long); j++)
        ((unsigned char *) (((unsigned long *) dst) + i))[j] = ((unsigned char *) (((unsigned long *) src) + i))[j];
       
    return (char *) src;
}
 
void *memcpy(void *dst, const void *src, size_t n)
{
    int i, j;
 
    if (((long) dst & (sizeof(long) - 1)) || ((long) src & (sizeof(long) - 1)))
        return unaligned_memcpy(dst, src, n);
 
    for (i = 0; i < n / sizeof(unsigned long); i++)
        ((unsigned long *) dst)[i] = ((unsigned long *) src)[i];
       
    for (j = 0; j < n % sizeof(unsigned long); j++)
        ((unsigned char *) (((unsigned long *) dst) + i))[j] = ((unsigned char *) (((unsigned long *) src) + i))[j];
       
    return (char *) src;
}
 
void *memmove(void *dst, const void *src, size_t n)
{
    int i, j;
   
    if (src > dst)
        return memcpy(dst, src, n);
 
    for (j = (n % sizeof(unsigned long)) - 1; j >= 0; j--)
        ((unsigned char *) ((unsigned long *) dst))[j] = ((unsigned char *) ((unsigned long *) src))[j];
 
    for (i = n / sizeof(unsigned long) - 1; i >=0 ; i--)
        ((unsigned long *) dst)[i] = ((unsigned long *) src)[i];
       
    return (char *) src;
}
 
/** Compare two memory areas.
 *
 * @param s1    Pointer to the first area to compare.
 * @param s2    Pointer to the second area to compare.
 * @param len   Size of the first area in bytes. Both areas must have the same
 *      length.
 * @return  If len is 0, return zero. If the areas match, return zero.
 *      Otherwise return non-zero.
 */
int bcmp(const char *s1, const char *s2, size_t len)
{
    for (; len && *s1++ == *s2++; len--)
        ;
    return len;
}
 
/** Count the number of characters in the string, not including terminating 0.
 * @param str string
 * @return number of characters in string.
 */
size_t strlen(const char *str)
{
    size_t counter = 0;
 
    while (str[counter] != 0)
        counter++;
 
    return counter;
}
 
int strcmp(const char *a, const char *b)
{
    int c = 0;
   
    while (a[c] && b[c] && (!(a[c] - b[c])))
        c++;
   
    return (a[c] - b[c]);
   
}
 
 
/** Return pointer to the first occurence of character c in string
 * @param str scanned string
 * @param c searched character (taken as one byte)
 * @return pointer to the matched character or NULL if it is not found in given string.
 */
char *strchr(const char *str, int c)
{
    while (*str != '\0') {
        if (*str == (char) c)
            return (char *) str;
        str++;
    }
 
    return NULL;
}
 
/** Return pointer to the last occurence of character c in string
 * @param str scanned string
 * @param c searched character (taken as one byte)
 * @return pointer to the matched character or NULL if it is not found in given string.
 */
char *strrchr(const char *str, int c)
{
    char *retval = NULL;
 
    while (*str != '\0') {
        if (*str == (char) c)
            retval = (char *) str;
        str++;
    }
 
    return (char *) retval;
}
 
/** Convert string to a number.
 * Core of strtol and strtoul functions.
 * @param nptr pointer to string
 * @param endptr if not NULL, function stores here pointer to the first invalid character
 * @param base zero or number between 2 and 36 inclusive
 * @param sgn its set to 1 if minus found
 * @return result of conversion.
 */
static unsigned long _strtoul(const char *nptr, char **endptr, int base, char *sgn)
{
    unsigned char c;
    unsigned long result = 0;
    unsigned long a, b;
    const char *str = nptr;
    const char *tmpptr;
   
    while (isspace(*str))
        str++;
   
    if (*str == '-') {
        *sgn = 1;
        ++str;
    } else if (*str == '+')
        ++str;
   
    if (base) {
        if ((base == 1) || (base > 36)) {
            /* FIXME: set errno to EINVAL */
            return 0;
        }
        if ((base == 16) && (*str == '0') && ((str[1] == 'x') || (str[1] == 'X'))) {
            str += 2;
        }
    } else {
        base = 10;
       
        if (*str == '0') {
            base = 8;
            if ((str[1] == 'X') || (str[1] == 'x'))  {
                base = 16;
                str += 2;
            }
        }
    }
   
    tmpptr = str;
 
    while (*str) {
        c = *str;
        c = (c >= 'a' ? c - 'a' + 10 : (c >= 'A' ? c - 'A' + 10 : (c <= '9' ? c - '0' : 0xff)));
        if (c > base) {
            break;
        }
       
        a = (result & 0xff) * base + c;
        b = (result >> 8) * base + (a >> 8);
       
        if (b > (ULONG_MAX >> 8)) {
            /* overflow */
            /* FIXME: errno = ERANGE*/
            return ULONG_MAX;
        }
   
        result = (b << 8) + (a & 0xff);
        ++str;
    }
   
    if (str == tmpptr) {
        /* no number was found => first invalid character is the first character of the string */
        /* FIXME: set errno to EINVAL */
        str = nptr;
        result = 0;
    }
   
    if (endptr)
        *endptr = (char *) str;
 
    if (nptr == str) {
        /*FIXME: errno = EINVAL*/
        return 0;
    }
 
    return result;
}
 
/** Convert initial part of string to long int according to given base.
 * The number may begin with an arbitrary number of whitespaces followed by optional sign (`+' or `-').
 * If the base is 0 or 16, the prefix `0x' may be inserted and the number will be taken as hexadecimal one.
 * If the base is 0 and the number begin with a zero, number will be taken as octal one (as with base 8).
 * Otherwise the base 0 is taken as decimal.
 * @param nptr pointer to string
 * @param endptr if not NULL, function stores here pointer to the first invalid character
 * @param base zero or number between 2 and 36 inclusive
 * @return result of conversion.
 */
long int strtol(const char *nptr, char **endptr, int base)
{
    char sgn = 0;
    unsigned long number = 0;
   
    number = _strtoul(nptr, endptr, base, &sgn);
 
    if (number > LONG_MAX) {
        if ((sgn) && (number == (unsigned long) (LONG_MAX) + 1)) {
            /* FIXME: set 0 to errno */
            return number;     
        }
        /* FIXME: set ERANGE to errno */
        return (sgn ? LONG_MIN : LONG_MAX);
    }
   
    return (sgn ? -number : number);
}
 
 
/** Convert initial part of string to unsigned long according to given base.
 * The number may begin with an arbitrary number of whitespaces followed by optional sign (`+' or `-').
 * If the base is 0 or 16, the prefix `0x' may be inserted and the number will be taken as hexadecimal one.
 * If the base is 0 and the number begin with a zero, number will be taken as octal one (as with base 8).
 * Otherwise the base 0 is taken as decimal.
 * @param nptr pointer to string
 * @param endptr if not NULL, function stores here pointer to the first invalid character
 * @param base zero or number between 2 and 36 inclusive
 * @return result of conversion.
 */
unsigned long strtoul(const char *nptr, char **endptr, int base)
{
    char sgn = 0;
    unsigned long number = 0;
   
    number = _strtoul(nptr, endptr, base, &sgn);
 
    return (sgn ? -number : number);
}
 
char *strcpy(char *dest, const char *src)
{
    char *orig = dest;
   
    while ((*(dest++) = *(src++)));
    return orig;
}
 
char *strncpy(char *dest, const char *src, size_t n)
{
    char *orig = dest;
   
    while ((*(dest++) = *(src++)) && --n);
    return orig;
}
 
/** @}
 */
 

Rev 2072	Rev 2130
1	/*	1	/*
2	* Copyright (c) 2005 Martin Decky	2	* Copyright (c) 2005 Martin Decky
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 libc	29	/** @addtogroup libc
30	* @{	30	* @{
31	*/	31	*/
32	/** @file	32	/** @file
33	*/	33	*/
34		34
35	#include <string.h>	35	#include <string.h>
36	#include <unistd.h>	36	#include <unistd.h>
37	#include <ctype.h>	37	#include <ctype.h>
38	#include <limits.h>	38	#include <limits.h>
39	#include <align.h>	39	#include <align.h>
40		40
41		41
42	/* Dummy implementation of mem/ functions */	42	/* Dummy implementation of mem/ functions */
43		43
44	void memset(void s, int c, size_t n)	44	void memset(void s, int c, size_t n)
45	{	45	{
46	char *os = s;	46	char *os = s;
47		47
48	while (n--)	48	while (n--)
49	*(os++) = c;	49	*(os++) = c;
50		50
51	return s;	51	return s;
52	}	52	}
53		53
54	struct along {	54	struct along {
55	unsigned long n;	55	unsigned long n;
56	} __attribute__ ((packed));	56	} __attribute__ ((packed));
57		57
58	static void unaligned_memcpy(void dst, const void *src, size_t n)	58	static void unaligned_memcpy(void dst, const void *src, size_t n)
59	{	59	{
60	int i, j;	60	int i, j;
61	struct along *adst = dst;	61	struct along *adst = dst;
62	const struct along *asrc = src;	62	const struct along *asrc = src;
63		63
64	for (i = 0; i < n / sizeof(unsigned long); i++)	64	for (i = 0; i < n / sizeof(unsigned long); i++)
65	adst[i].n = asrc[i].n;	65	adst[i].n = asrc[i].n;
66		66
67	for (j = 0; j < n % sizeof(unsigned long); j++)	67	for (j = 0; j < n % sizeof(unsigned long); j++)
68	((unsigned char ) (((unsigned long ) dst) + i))[j] = ((unsigned char ) (((unsigned long ) src) + i))[j];	68	((unsigned char ) (((unsigned long ) dst) + i))[j] = ((unsigned char ) (((unsigned long ) src) + i))[j];
69		69
70	return (char *) src;	70	return (char *) src;
71	}	71	}
72		72
73	void memcpy(void dst, const void *src, size_t n)	73	void memcpy(void dst, const void *src, size_t n)
74	{	74	{
75	int i, j;	75	int i, j;
76		76
77	if (((long) dst & (sizeof(long) - 1)) \|\| ((long) src & (sizeof(long) - 1)))	77	if (((long) dst & (sizeof(long) - 1)) \|\| ((long) src & (sizeof(long) - 1)))
78	return unaligned_memcpy(dst, src, n);	78	return unaligned_memcpy(dst, src, n);
79		79
80	for (i = 0; i < n / sizeof(unsigned long); i++)	80	for (i = 0; i < n / sizeof(unsigned long); i++)
81	((unsigned long ) dst)[i] = ((unsigned long ) src)[i];	81	((unsigned long ) dst)[i] = ((unsigned long ) src)[i];
82		82
83	for (j = 0; j < n % sizeof(unsigned long); j++)	83	for (j = 0; j < n % sizeof(unsigned long); j++)
84	((unsigned char ) (((unsigned long ) dst) + i))[j] = ((unsigned char ) (((unsigned long ) src) + i))[j];	84	((unsigned char ) (((unsigned long ) dst) + i))[j] = ((unsigned char ) (((unsigned long ) src) + i))[j];
85		85
86	return (char *) src;	86	return (char *) src;
87	}	87	}
88		88
89	void memmove(void dst, const void *src, size_t n)	89	void memmove(void dst, const void *src, size_t n)
90	{	90	{
91	int i, j;	91	int i, j;
92		92
93	if (src > dst)	93	if (src > dst)
94	return memcpy(dst, src, n);	94	return memcpy(dst, src, n);
95		95
96	for (j = (n % sizeof(unsigned long)) - 1; j >= 0; j--)	96	for (j = (n % sizeof(unsigned long)) - 1; j >= 0; j--)
97	((unsigned char ) ((unsigned long ) dst))[j] = ((unsigned char ) ((unsigned long ) src))[j];	97	((unsigned char ) ((unsigned long ) dst))[j] = ((unsigned char ) ((unsigned long ) src))[j];
98		98
99	for (i = n / sizeof(unsigned long) - 1; i >=0 ; i--)	99	for (i = n / sizeof(unsigned long) - 1; i >=0 ; i--)
100	((unsigned long ) dst)[i] = ((unsigned long ) src)[i];	100	((unsigned long ) dst)[i] = ((unsigned long ) src)[i];
101		101
102	return (char *) src;	102	return (char *) src;
103	}	103	}
104		104
105	/** Compare two memory areas.	105	/** Compare two memory areas.
106	*	106	*
107	* @param s1 Pointer to the first area to compare.	107	* @param s1 Pointer to the first area to compare.
108	* @param s2 Pointer to the second area to compare.	108	* @param s2 Pointer to the second area to compare.
109	* @param len Size of the first area in bytes. Both areas must have the same	109	* @param len Size of the first area in bytes. Both areas must have the same
110	* length.	110	* length.
111	* @return If len is 0, return zero. If the areas match, return zero.	111	* @return If len is 0, return zero. If the areas match, return zero.
112	* Otherwise return non-zero.	112	* Otherwise return non-zero.
113	*/	113	*/
114	int bcmp(const char s1, const char s2, size_t len)	114	int bcmp(const char s1, const char s2, size_t len)
115	{	115	{
116	for (; len && s1++ == s2++; len--)	116	for (; len && s1++ == s2++; len--)
117	;	117	;
118	return len;	118	return len;
119	}	119	}
120		120
121	/** Count the number of characters in the string, not including terminating 0.	121	/** Count the number of characters in the string, not including terminating 0.
122	* @param str string	122	* @param str string
123	* @return number of characters in string.	123	* @return number of characters in string.
124	*/	124	*/
125	size_t strlen(const char *str)	125	size_t strlen(const char *str)
126	{	126	{
127	size_t counter = 0;	127	size_t counter = 0;
128		128
129	while (str[counter] != 0)	129	while (str[counter] != 0)
130	counter++;	130	counter++;
131		131
132	return counter;	132	return counter;
133	}	133	}
134		134
135	int strcmp(const char a, const char b)	135	int strcmp(const char a, const char b)
136	{	136	{
137	int c = 0;	137	int c = 0;
138		138
139	while (a[c] && b[c] && (!(a[c] - b[c])))	139	while (a[c] && b[c] && (!(a[c] - b[c])))
140	c++;	140	c++;
141		141
142	return (a[c] - b[c]);	142	return (a[c] - b[c]);
143		143
144	}	144	}
145		145
146		146
147	/** Return pointer to the first occurence of character c in string	147	/** Return pointer to the first occurence of character c in string
148	* @param str scanned string	148	* @param str scanned string
149	* @param c searched character (taken as one byte)	149	* @param c searched character (taken as one byte)
150	* @return pointer to the matched character or NULL if it is not found in given string.	150	* @return pointer to the matched character or NULL if it is not found in given string.
151	*/	151	*/
152	char strchr(const char str, int c)	152	char strchr(const char str, int c)
153	{	153	{
154	while (*str != '\0') {	154	while (*str != '\0') {
155	if (*str == (char) c)	155	if (*str == (char) c)
156	return (char *) str;	156	return (char *) str;
157	str++;	157	str++;
158	}	158	}
159		159
160	return NULL;	160	return NULL;
161	}	161	}
162		162
163	/** Return pointer to the last occurence of character c in string	163	/** Return pointer to the last occurence of character c in string
164	* @param str scanned string	164	* @param str scanned string
165	* @param c searched character (taken as one byte)	165	* @param c searched character (taken as one byte)
166	* @return pointer to the matched character or NULL if it is not found in given string.	166	* @return pointer to the matched character or NULL if it is not found in given string.
167	*/	167	*/
168	char strrchr(const char str, int c)	168	char strrchr(const char str, int c)
169	{	169	{
170	char *retval = NULL;	170	char *retval = NULL;
171		171
172	while (*str != '\0') {	172	while (*str != '\0') {
173	if (*str == (char) c)	173	if (*str == (char) c)
174	retval = (char *) str;	174	retval = (char *) str;
175	str++;	175	str++;
176	}	176	}
177		177
178	return (char *) retval;	178	return (char *) retval;
179	}	179	}
180		180
181	/** Convert string to a number.	181	/** Convert string to a number.
182	* Core of strtol and strtoul functions.	182	* Core of strtol and strtoul functions.
183	* @param nptr pointer to string	183	* @param nptr pointer to string
184	* @param endptr if not NULL, function stores here pointer to the first invalid character	184	* @param endptr if not NULL, function stores here pointer to the first invalid character
185	* @param base zero or number between 2 and 36 inclusive	185	* @param base zero or number between 2 and 36 inclusive
186	* @param sgn its set to 1 if minus found	186	* @param sgn its set to 1 if minus found
187	* @return result of conversion.	187	* @return result of conversion.
188	*/	188	*/
189	static unsigned long _strtoul(const char nptr, char endptr, int base, char sgn)	189	static unsigned long _strtoul(const char nptr, char endptr, int base, char sgn)
190	{	190	{
191	unsigned char c;	191	unsigned char c;
192	unsigned long result = 0;	192	unsigned long result = 0;
193	unsigned long a, b;	193	unsigned long a, b;
194	const char *str = nptr;	194	const char *str = nptr;
195	const char *tmpptr;	195	const char *tmpptr;
196		196
197	while (isspace(*str))	197	while (isspace(*str))
198	str++;	198	str++;
199		199
200	if (*str == '-') {	200	if (*str == '-') {
201	*sgn = 1;	201	*sgn = 1;
202	++str;	202	++str;
203	} else if (*str == '+')	203	} else if (*str == '+')
204	++str;	204	++str;
205		205
206	if (base) {	206	if (base) {
207	if ((base == 1) \|\| (base > 36)) {	207	if ((base == 1) \|\| (base > 36)) {
208	/* FIXME: set errno to EINVAL */	208	/* FIXME: set errno to EINVAL */
209	return 0;	209	return 0;
210	}	210	}
211	if ((base == 16) && (*str == '0') && ((str[1] == 'x') \|\| (str[1] == 'X'))) {	211	if ((base == 16) && (*str == '0') && ((str[1] == 'x') \|\| (str[1] == 'X'))) {
212	str += 2;	212	str += 2;
213	}	213	}
214	} else {	214	} else {
215	base = 10;	215	base = 10;
216		216
217	if (*str == '0') {	217	if (*str == '0') {
218	base = 8;	218	base = 8;
219	if ((str[1] == 'X') \|\| (str[1] == 'x')) {	219	if ((str[1] == 'X') \|\| (str[1] == 'x')) {
220	base = 16;	220	base = 16;
221	str += 2;	221	str += 2;
222	}	222	}
223	}	223	}
224	}	224	}
225		225
226	tmpptr = str;	226	tmpptr = str;
227		227
228	while (*str) {	228	while (*str) {
229	c = *str;	229	c = *str;
230	c = (c >= 'a' ? c - 'a' + 10 : (c >= 'A' ? c - 'A' + 10 : (c <= '9' ? c - '0' : 0xff)));	230	c = (c >= 'a' ? c - 'a' + 10 : (c >= 'A' ? c - 'A' + 10 : (c <= '9' ? c - '0' : 0xff)));
231	if (c > base) {	231	if (c > base) {
232	break;	232	break;
233	}	233	}
234		234
235	a = (result & 0xff) * base + c;	235	a = (result & 0xff) * base + c;
236	b = (result >> 8) * base + (a >> 8);	236	b = (result >> 8) * base + (a >> 8);
237		237
238	if (b > (ULONG_MAX >> 8)) {	238	if (b > (ULONG_MAX >> 8)) {
239	/* overflow */	239	/* overflow */
240	/* FIXME: errno = ERANGE*/	240	/* FIXME: errno = ERANGE*/
241	return ULONG_MAX;	241	return ULONG_MAX;
242	}	242	}
243		243
244	result = (b << 8) + (a & 0xff);	244	result = (b << 8) + (a & 0xff);
245	++str;	245	++str;
246	}	246	}
247		247
248	if (str == tmpptr) {	248	if (str == tmpptr) {
249	/* no number was found => first invalid character is the first character of the string */	249	/* no number was found => first invalid character is the first character of the string */
250	/* FIXME: set errno to EINVAL */	250	/* FIXME: set errno to EINVAL */
251	str = nptr;	251	str = nptr;
252	result = 0;	252	result = 0;
253	}	253	}
254		254
255	if (endptr)	255	if (endptr)
256	endptr = (char ) str;	256	endptr = (char ) str;
257		257
258	if (nptr == str) {	258	if (nptr == str) {
259	/FIXME: errno = EINVAL/	259	/FIXME: errno = EINVAL/
260	return 0;	260	return 0;
261	}	261	}
262		262
263	return result;	263	return result;
264	}	264	}
265		265
266	/** Convert initial part of string to long int according to given base.	266	/** Convert initial part of string to long int according to given base.
267	* The number may begin with an arbitrary number of whitespaces followed by optional sign (`+' or `-').	267	* The number may begin with an arbitrary number of whitespaces followed by optional sign (`+' or `-').
268	* If the base is 0 or 16, the prefix `0x' may be inserted and the number will be taken as hexadecimal one.	268	* If the base is 0 or 16, the prefix `0x' may be inserted and the number will be taken as hexadecimal one.
269	* If the base is 0 and the number begin with a zero, number will be taken as octal one (as with base 8).	269	* If the base is 0 and the number begin with a zero, number will be taken as octal one (as with base 8).
270	* Otherwise the base 0 is taken as decimal.	270	* Otherwise the base 0 is taken as decimal.
271	* @param nptr pointer to string	271	* @param nptr pointer to string
272	* @param endptr if not NULL, function stores here pointer to the first invalid character	272	* @param endptr if not NULL, function stores here pointer to the first invalid character
273	* @param base zero or number between 2 and 36 inclusive	273	* @param base zero or number between 2 and 36 inclusive
274	* @return result of conversion.	274	* @return result of conversion.
275	*/	275	*/
276	long int strtol(const char nptr, char *endptr, int base)	276	long int strtol(const char nptr, char *endptr, int base)
277	{	277	{
278	char sgn = 0;	278	char sgn = 0;
279	unsigned long number = 0;	279	unsigned long number = 0;
280		280
281	number = _strtoul(nptr, endptr, base, &sgn);	281	number = _strtoul(nptr, endptr, base, &sgn);
282		282
283	if (number > LONG_MAX) {	283	if (number > LONG_MAX) {
284	if ((sgn) && (number == (unsigned long) (LONG_MAX) + 1)) {	284	if ((sgn) && (number == (unsigned long) (LONG_MAX) + 1)) {
285	/* FIXME: set 0 to errno */	285	/* FIXME: set 0 to errno */
286	return number;	286	return number;
287	}	287	}
288	/* FIXME: set ERANGE to errno */	288	/* FIXME: set ERANGE to errno */
289	return (sgn ? LONG_MIN : LONG_MAX);	289	return (sgn ? LONG_MIN : LONG_MAX);
290	}	290	}
291		291
292	return (sgn ? -number : number);	292	return (sgn ? -number : number);
293	}	293	}
294		294
295		295
296	/** Convert initial part of string to unsigned long according to given base.	296	/** Convert initial part of string to unsigned long according to given base.
297	* The number may begin with an arbitrary number of whitespaces followed by optional sign (`+' or `-').	297	* The number may begin with an arbitrary number of whitespaces followed by optional sign (`+' or `-').
298	* If the base is 0 or 16, the prefix `0x' may be inserted and the number will be taken as hexadecimal one.	298	* If the base is 0 or 16, the prefix `0x' may be inserted and the number will be taken as hexadecimal one.
299	* If the base is 0 and the number begin with a zero, number will be taken as octal one (as with base 8).	299	* If the base is 0 and the number begin with a zero, number will be taken as octal one (as with base 8).
300	* Otherwise the base 0 is taken as decimal.	300	* Otherwise the base 0 is taken as decimal.
301	* @param nptr pointer to string	301	* @param nptr pointer to string
302	* @param endptr if not NULL, function stores here pointer to the first invalid character	302	* @param endptr if not NULL, function stores here pointer to the first invalid character
303	* @param base zero or number between 2 and 36 inclusive	303	* @param base zero or number between 2 and 36 inclusive
304	* @return result of conversion.	304	* @return result of conversion.
305	*/	305	*/
306	unsigned long strtoul(const char nptr, char *endptr, int base)	306	unsigned long strtoul(const char nptr, char *endptr, int base)
307	{	307	{
308	char sgn = 0;	308	char sgn = 0;
309	unsigned long number = 0;	309	unsigned long number = 0;
310		310
311	number = _strtoul(nptr, endptr, base, &sgn);	311	number = _strtoul(nptr, endptr, base, &sgn);
312		312
313	return (sgn ? -number : number);	313	return (sgn ? -number : number);
314	}	314	}
315		315
316	char strcpy(char dest, const char *src)	316	char strcpy(char dest, const char *src)
317	{	317	{
318	char *orig = dest;	318	char *orig = dest;
319		319
320	while (((dest++) = (src++)));	320	while (((dest++) = (src++)));
321	return orig;	321	return orig;
322	}	322	}
323		323
324	char strncpy(char dest, const char *src, size_t n)	324	char strncpy(char dest, const char *src, size_t n)
325	{	325	{
326	char *orig = dest;	326	char *orig = dest;
327		327
328	while (((dest++) = (src++)) && --n);	328	while (((dest++) = (src++)) && --n);
329	return orig;	329	return orig;
330	}	330	}
331		331
332	/** @}	332	/** @}
333	*/	333	*/
334		334

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(root)/tags/0.2.0.4/uspace/libc/generic/string.c – Rev 2072 → 2130