#include "lib9.h" #define UVLONG_MAX	((uvlong)1<<63) uvlongstrtoull(const char *nptr, char **endptr, int base){	const char *p;	uvlong n, nn, m;	int c, ovfl, v, neg, ndig; 	p = nptr;	neg = 0;	n = 0;	ndig = 0;	ovfl = 0; 	/*	 * White space	 */	for(;; p++) {		switch(*p) {		case ' ':		case '\t':		case '\n':		case '\f':		case '\r':		case '\v':			continue;		}		break;	} 	/*	 * Sign	 */	if(*p == '-' || *p == '+')		if(*p++ == '-')			neg = 1; 	/*	 * Base	 */	if(base == 0) {		base = 10;		if(*p == '0') {			base = 8;			if(p[1] == 'x' || p[1] == 'X'){				p += 2;				base = 16;			}		}	} else	if(base == 16 && *p == '0') {		if(p[1] == 'x' || p[1] == 'X')			p += 2;	} else	if(base < 0 || 36 < base)		goto Return; 	/*	 * Non-empty sequence of digits	 */	m = UVLONG_MAX/base;	for(;; p++,ndig++) {		c = *p;		v = base;		if('0' <= c && c <= '9')			v = c - '0';		else		if('a' <= c && c <= 'z')			v = c - 'a' + 10;		else		if('A' <= c && c <= 'Z')			v = c - 'A' + 10;		if(v >= base)			break;		if(n > m)			ovfl = 1;		nn = n*base + v;		if(nn < n)			ovfl = 1;		n = nn;	} Return:	if(ndig == 0)		p = nptr;	if(endptr)		*endptr = (char*)p;	if(ovfl)		return UVLONG_MAX;	if(neg)		return -n;	return n;}