WebSVN – HelenOS-historic – Diff – /uspace/trunk/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.
 */
 
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <limits.h>
 
 
/* Dummy implementation of mem/ functions */
 
void * memset(void *s, int c, size_t n)
{
    char *os = s;
    while (n--)
        *(os++) = c;
    return s;
}
 
void * memcpy(void *dst, const void *src, size_t n)
{
    int i, j;
 
    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) + i))[j] = ((unsigned char *)(((unsigned long *) src) + i))[j];
 
    for (i = n/sizeof(unsigned long)-1; i >=0 ; i--)
        ((unsigned long *) dst)[i] = ((unsigned long *) src)[i];
       
    return (char *)src;
}
 
 
/** 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)
{
    while (*(dest++) = *(src++))
        ;
}
 
char *strncpy(char *dest, const char *src, size_t n)
{
    while ((*(dest++) = *(src++)) && --n)
        ;
}
 

Rev 1485	Rev 1530
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	#include <string.h>	29	#include <string.h>
30	#include <unistd.h>	30	#include <unistd.h>
31	#include <ctype.h>	31	#include <ctype.h>
32	#include <limits.h>	32	#include <limits.h>
33		33
34		34
35	/* Dummy implementation of mem/ functions */	35	/* Dummy implementation of mem/ functions */
36		36
37	void * memset(void *s, int c, size_t n)	37	void * memset(void *s, int c, size_t n)
38	{	38	{
39	char *os = s;	39	char *os = s;
40	while (n--)	40	while (n--)
41	*(os++) = c;	41	*(os++) = c;
42	return s;	42	return s;
43	}	43	}
44		44
45	void * memcpy(void dst, const void src, size_t n)	45	void * memcpy(void dst, const void src, size_t n)
46	{	46	{
47	int i, j;	47	int i, j;
48		48
49	for (i = 0; i < n/sizeof(unsigned long); i++)	49	for (i = 0; i < n/sizeof(unsigned long); i++)
50	((unsigned long ) dst)[i] = ((unsigned long ) src)[i];	50	((unsigned long ) dst)[i] = ((unsigned long ) src)[i];
51		51
52	for (j = 0; j < n%sizeof(unsigned long); j++)	52	for (j = 0; j < n%sizeof(unsigned long); j++)
53	((unsigned char )(((unsigned long ) dst) + i))[j] = ((unsigned char )(((unsigned long ) src) + i))[j];	53	((unsigned char )(((unsigned long ) dst) + i))[j] = ((unsigned char )(((unsigned long ) src) + i))[j];
54		54
55	return (char *)src;	55	return (char *)src;
56	}	56	}
57		57
58	void * memmove(void dst, const void src, size_t n)	58	void * memmove(void dst, const void src, size_t n)
59	{	59	{
60	int i, j;	60	int i, j;
61		61
62	if (src > dst)	62	if (src > dst)
63	return memcpy(dst, src, n);	63	return memcpy(dst, src, n);
64		64
65	for (j = (n%sizeof(unsigned long))-1; j >= 0; j--)	65	for (j = (n%sizeof(unsigned long))-1; j >= 0; j--)
66	((unsigned char )(((unsigned long ) dst) + i))[j] = ((unsigned char )(((unsigned long ) src) + i))[j];	66	((unsigned char )(((unsigned long ) dst) + i))[j] = ((unsigned char )(((unsigned long ) src) + i))[j];
67		67
68	for (i = n/sizeof(unsigned long)-1; i >=0 ; i--)	68	for (i = n/sizeof(unsigned long)-1; i >=0 ; i--)
69	((unsigned long ) dst)[i] = ((unsigned long ) src)[i];	69	((unsigned long ) dst)[i] = ((unsigned long ) src)[i];
70		70
71	return (char *)src;	71	return (char *)src;
72	}	72	}
73		73
74		74
75	/** Count the number of characters in the string, not including terminating 0.	75	/** Count the number of characters in the string, not including terminating 0.
76	* @param str string	76	* @param str string
77	* @return number of characters in string.	77	* @return number of characters in string.
78	*/	78	*/
79	size_t strlen(const char *str)	79	size_t strlen(const char *str)
80	{	80	{
81	size_t counter = 0;	81	size_t counter = 0;
82		82
83	while (str[counter] != 0) {	83	while (str[counter] != 0) {
84	counter++;	84	counter++;
85	}	85	}
86		86
87	return counter;	87	return counter;
88	}	88	}
89		89
90	int strcmp(const char a,const char b)	90	int strcmp(const char a,const char b)
91	{	91	{
92	int c=0;	92	int c=0;
93		93
94	while(a[c]&&b[c]&&(!(a[c]-b[c]))) c++;	94	while(a[c]&&b[c]&&(!(a[c]-b[c]))) c++;
95		95
96	return a[c]-b[c];	96	return a[c]-b[c];
97		97
98	}	98	}
99		99
100		100
101		101
102	/** Return pointer to the first occurence of character c in string	102	/** Return pointer to the first occurence of character c in string
103	* @param str scanned string	103	* @param str scanned string
104	* @param c searched character (taken as one byte)	104	* @param c searched character (taken as one byte)
105	* @return pointer to the matched character or NULL if it is not found in given string.	105	* @return pointer to the matched character or NULL if it is not found in given string.
106	*/	106	*/
107	char strchr(const char str, int c)	107	char strchr(const char str, int c)
108	{	108	{
109	while (*str != '\0') {	109	while (*str != '\0') {
110	if (*str == (char)c)	110	if (*str == (char)c)
111	return (char *)str;	111	return (char *)str;
112	str++;	112	str++;
113	}	113	}
114		114
115	return NULL;	115	return NULL;
116	}	116	}
117		117
118	/** Return pointer to the last occurence of character c in string	118	/** Return pointer to the last occurence of character c in string
119	* @param str scanned string	119	* @param str scanned string
120	* @param c searched character (taken as one byte)	120	* @param c searched character (taken as one byte)
121	* @return pointer to the matched character or NULL if it is not found in given string.	121	* @return pointer to the matched character or NULL if it is not found in given string.
122	*/	122	*/
123	char strrchr(const char str, int c)	123	char strrchr(const char str, int c)
124	{	124	{
125	char *retval = NULL;	125	char *retval = NULL;
126		126
127	while (*str != '\0') {	127	while (*str != '\0') {
128	if (*str == (char)c)	128	if (*str == (char)c)
129	retval = (char *)str;	129	retval = (char *)str;
130	str++;	130	str++;
131	}	131	}
132		132
133	return (char *)retval;	133	return (char *)retval;
134	}	134	}
135		135
136	/** Convert string to a number.	136	/** Convert string to a number.
137	* Core of strtol and strtoul functions.	137	* Core of strtol and strtoul functions.
138	* @param nptr pointer to string	138	* @param nptr pointer to string
139	* @param endptr if not NULL, function stores here pointer to the first invalid character	139	* @param endptr if not NULL, function stores here pointer to the first invalid character
140	* @param base zero or number between 2 and 36 inclusive	140	* @param base zero or number between 2 and 36 inclusive
141	* @param sgn its set to 1 if minus found	141	* @param sgn its set to 1 if minus found
142	* @return result of conversion.	142	* @return result of conversion.
143	*/	143	*/
144	static unsigned long _strtoul(const char nptr, char endptr, int base, char sgn)	144	static unsigned long _strtoul(const char nptr, char endptr, int base, char sgn)
145	{	145	{
146	unsigned char c;	146	unsigned char c;
147	unsigned long result = 0;	147	unsigned long result = 0;
148	unsigned long a, b;	148	unsigned long a, b;
149	const char *str = nptr;	149	const char *str = nptr;
150	const char *tmpptr;	150	const char *tmpptr;
151		151
152	while (isspace(*str))	152	while (isspace(*str))
153	str++;	153	str++;
154		154
155	if (*str == '-') {	155	if (*str == '-') {
156	*sgn = 1;	156	*sgn = 1;
157	++str;	157	++str;
158	} else if (*str == '+')	158	} else if (*str == '+')
159	++str;	159	++str;
160		160
161	if (base) {	161	if (base) {
162	if ((base == 1) \|\| (base > 36)) {	162	if ((base == 1) \|\| (base > 36)) {
163	/* FIXME: set errno to EINVAL */	163	/* FIXME: set errno to EINVAL */
164	return 0;	164	return 0;
165	}	165	}
166	if ((base == 16) && (*str == '0') && ((str[1] == 'x') \|\| (str[1] == 'X'))) {	166	if ((base == 16) && (*str == '0') && ((str[1] == 'x') \|\| (str[1] == 'X'))) {
167	str += 2;	167	str += 2;
168	}	168	}
169	} else {	169	} else {
170	base = 10;	170	base = 10;
171		171
172	if (*str == '0') {	172	if (*str == '0') {
173	base = 8;	173	base = 8;
174	if ((str[1] == 'X') \|\| (str[1] == 'x')) {	174	if ((str[1] == 'X') \|\| (str[1] == 'x')) {
175	base = 16;	175	base = 16;
176	str += 2;	176	str += 2;
177	}	177	}
178	}	178	}
179	}	179	}
180		180
181	tmpptr = str;	181	tmpptr = str;
182		182
183	while (*str) {	183	while (*str) {
184	c = *str;	184	c = *str;
185	c = ( c >= 'a'? c-'a'+10:(c >= 'A'?c-'A'+10:(c <= '9'?c-'0':0xff)));	185	c = ( c >= 'a'? c-'a'+10:(c >= 'A'?c-'A'+10:(c <= '9'?c-'0':0xff)));
186	if (c > base) {	186	if (c > base) {
187	break;	187	break;
188	}	188	}
189		189
190	a = (result & 0xff) * base + c;	190	a = (result & 0xff) * base + c;
191	b = (result >> 8) * base + (a >> 8);	191	b = (result >> 8) * base + (a >> 8);
192		192
193	if (b > (ULONG_MAX >> 8)) {	193	if (b > (ULONG_MAX >> 8)) {
194	/* overflow */	194	/* overflow */
195	/* FIXME: errno = ERANGE*/	195	/* FIXME: errno = ERANGE*/
196	return ULONG_MAX;	196	return ULONG_MAX;
197	}	197	}
198		198
199	result = (b << 8) + (a & 0xff);	199	result = (b << 8) + (a & 0xff);
200	++str;	200	++str;
201	}	201	}
202		202
203	if (str == tmpptr) {	203	if (str == tmpptr) {
204	/* no number was found => first invalid character is the first character of the string */	204	/* no number was found => first invalid character is the first character of the string */
205	/* FIXME: set errno to EINVAL */	205	/* FIXME: set errno to EINVAL */
206	str = nptr;	206	str = nptr;
207	result = 0;	207	result = 0;
208	}	208	}
209		209
210	if (endptr)	210	if (endptr)
211	endptr = (char )str;	211	endptr = (char )str;
212		212
213	if (nptr == str) {	213	if (nptr == str) {
214	/FIXME: errno = EINVAL/	214	/FIXME: errno = EINVAL/
215	return 0;	215	return 0;
216	}	216	}
217		217
218	return result;	218	return result;
219	}	219	}
220		220
221	/** Convert initial part of string to long int according to given base.	221	/** Convert initial part of string to long int according to given base.
222	* The number may begin with an arbitrary number of whitespaces followed by optional sign (`+' or `-').	222	* The number may begin with an arbitrary number of whitespaces followed by optional sign (`+' or `-').
223	* If the base is 0 or 16, the prefix `0x' may be inserted and the number will be taken as hexadecimal one.	223	* If the base is 0 or 16, the prefix `0x' may be inserted and the number will be taken as hexadecimal one.
224	* If the base is 0 and the number begin with a zero, number will be taken as octal one (as with base 8).	224	* If the base is 0 and the number begin with a zero, number will be taken as octal one (as with base 8).
225	* Otherwise the base 0 is taken as decimal.	225	* Otherwise the base 0 is taken as decimal.
226	* @param nptr pointer to string	226	* @param nptr pointer to string
227	* @param endptr if not NULL, function stores here pointer to the first invalid character	227	* @param endptr if not NULL, function stores here pointer to the first invalid character
228	* @param base zero or number between 2 and 36 inclusive	228	* @param base zero or number between 2 and 36 inclusive
229	* @return result of conversion.	229	* @return result of conversion.
230	*/	230	*/
231	long int strtol(const char nptr, char *endptr, int base)	231	long int strtol(const char nptr, char *endptr, int base)
232	{	232	{
233	char sgn = 0;	233	char sgn = 0;
234	unsigned long number = 0;	234	unsigned long number = 0;
235		235
236	number = _strtoul(nptr, endptr, base, &sgn);	236	number = _strtoul(nptr, endptr, base, &sgn);
237		237
238	if (number > LONG_MAX) {	238	if (number > LONG_MAX) {
239	if ((sgn) && (number == (unsigned long)(LONG_MAX) + 1)) {	239	if ((sgn) && (number == (unsigned long)(LONG_MAX) + 1)) {
240	/* FIXME: set 0 to errno */	240	/* FIXME: set 0 to errno */
241	return number;	241	return number;
242	}	242	}
243	/* FIXME: set ERANGE to errno */	243	/* FIXME: set ERANGE to errno */
244	return (sgn?LONG_MIN:LONG_MAX);	244	return (sgn?LONG_MIN:LONG_MAX);
245	}	245	}
246		246
247	return (sgn?-number:number);	247	return (sgn?-number:number);
248	}	248	}
249		249
250		250
251	/** Convert initial part of string to unsigned long according to given base.	251	/** Convert initial part of string to unsigned long according to given base.
252	* The number may begin with an arbitrary number of whitespaces followed by optional sign (`+' or `-').	252	* The number may begin with an arbitrary number of whitespaces followed by optional sign (`+' or `-').
253	* If the base is 0 or 16, the prefix `0x' may be inserted and the number will be taken as hexadecimal one.	253	* If the base is 0 or 16, the prefix `0x' may be inserted and the number will be taken as hexadecimal one.
254	* If the base is 0 and the number begin with a zero, number will be taken as octal one (as with base 8).	254	* If the base is 0 and the number begin with a zero, number will be taken as octal one (as with base 8).
255	* Otherwise the base 0 is taken as decimal.	255	* Otherwise the base 0 is taken as decimal.
256	* @param nptr pointer to string	256	* @param nptr pointer to string
257	* @param endptr if not NULL, function stores here pointer to the first invalid character	257	* @param endptr if not NULL, function stores here pointer to the first invalid character
258	* @param base zero or number between 2 and 36 inclusive	258	* @param base zero or number between 2 and 36 inclusive
259	* @return result of conversion.	259	* @return result of conversion.
260	*/	260	*/
261	unsigned long strtoul(const char nptr, char *endptr, int base)	261	unsigned long strtoul(const char nptr, char *endptr, int base)
262	{	262	{
263	char sgn = 0;	263	char sgn = 0;
264	unsigned long number = 0;	264	unsigned long number = 0;
265		265
266	number = _strtoul(nptr, endptr, base, &sgn);	266	number = _strtoul(nptr, endptr, base, &sgn);
267		267
268	return (sgn?-number:number);	268	return (sgn?-number:number);
269	}	269	}
270		270
271	char strcpy(char dest, const char *src)	271	char strcpy(char dest, const char *src)
272	{	272	{
273	while ((dest++) = (src++))	273	while ((dest++) = (src++))
274	;	274	;
275	}	275	}
276		276
277	char strncpy(char dest, const char *src, size_t n)	277	char strncpy(char dest, const char *src, size_t n)
278	{	278	{
279	while ((dest++) = (src++) && --n)	279	while (((dest++) = (src++)) && --n)
280	;	280	;
281	}	281	}
282		282

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(root)/uspace/trunk/libc/generic/string.c @ 1649 – Rev 1485 → 1530