long  atol(const char *nptr){	int c; /* current char */	long total; /* current total */	int sign; /* if ''-'', then negative, otherwise positive */	/* skip whitespace */	while ( isspace((int)(unsigned char)*nptr) )	++nptr;	c = (int)(unsigned char)*nptr++;	sign = c; 	if (c == ''-'' || c == ''+'')		c = (int)(unsigned char)*nptr++; 	total = 0;	while (isdigit(c)) {	total = 10 * total + (c - ''0''); /* accumulate digit */	c = (int)(unsigned char)*nptr++; /* get next char */	}	if (sign == ''-'')		return -total;	else		return total; /* return result, negated if necessary */}

 

 

char* _itoa(int value, char* string, int radix){	char tmp[33];	char* tp = tmp;	int i;	unsigned v;	int sign;	char* sp;	if (radix > 36 || radix <= 1)	{		__set_errno(EDOM);		return 0;	}	sign = (radix == 10 && value < 0);	if (sign)		v = -value;	else		v = (unsigned)value;	while (v || tp == tmp)	{	i = v % radix;	v = v / radix;	if (i < 10)		*tp++ = i+''0'';	else		*tp++ = i + ''a'' - 10;	}	if (string == 0)		string = (char*)malloc((tp-tmp)+sign+1);	sp = string;	if (sign)		*sp++ = ''-'';	while (tp > tmp)	*sp++ = *--tp;	*sp = 0;		return string;}