27,7 → 27,11 |
*/ |
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#include <string.h> |
#include <unistd.h> |
#include <ctype.h> |
#include <limits.h> |
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/* Dummy implementation of mem/ functions */ |
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void * memset(void *s, int c, size_t n) |
47,6 → 51,10 |
return dest; |
} |
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/** 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; |
57,3 → 65,172 |
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return counter; |
} |
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/** 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++; |
} |
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return NULL; |
} |
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/** 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; |
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while (*str != '\0') { |
if (*str == (char)c) |
retval = (char *)str; |
str++; |
} |
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return (char *)retval; |
} |
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/** 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; |
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while (isspace(*str)) |
str++; |
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if (*str == '-') { |
*sgn = 1; |
++str; |
} else if (*str == '+') |
++str; |
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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; |
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if (*str == '0') { |
base = 8; |
if ((str[1] == 'X') || (str[1] == 'x')) { |
base = 16; |
str += 2; |
} |
} |
} |
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tmpptr = str; |
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while (*str) { |
c = *str; |
c = ( c >= 'a'? c-'a'+10:(c >= 'A'?c-'A'+10:(c <= '9'?c-'0':0xff))); |
if (c > base) { |
break; |
} |
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a = (result & 0xff) * base + c; |
b = (result >> 8) * base + (a >> 8); |
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if (b > (ULONG_MAX >> 8)) { |
/* overflow */ |
/* FIXME: errno = ERANGE*/ |
return ULONG_MAX; |
} |
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result = (b << 8) + (a & 0xff); |
++str; |
} |
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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; |
} |
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if (endptr) |
*endptr = (char *)str; |
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if (nptr == str) { |
/*FIXME: errno = EINVAL*/ |
return 0; |
} |
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return result; |
} |
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/** 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; |
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number = _strtoul(nptr, endptr, base, &sgn); |
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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); |
} |
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return (sgn?-number:number); |
} |
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/** 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; |
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number = _strtoul(nptr, endptr, base, &sgn); |
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return (sgn?-number:number); |
} |