strtoull.c revision 82975
11573Srgrimes/*- 21573Srgrimes * Copyright (c) 1992, 1993 31573Srgrimes * The Regents of the University of California. All rights reserved. 41573Srgrimes * 51573Srgrimes * Redistribution and use in source and binary forms, with or without 61573Srgrimes * modification, are permitted provided that the following conditions 71573Srgrimes * are met: 81573Srgrimes * 1. Redistributions of source code must retain the above copyright 91573Srgrimes * notice, this list of conditions and the following disclaimer. 101573Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111573Srgrimes * notice, this list of conditions and the following disclaimer in the 121573Srgrimes * documentation and/or other materials provided with the distribution. 131573Srgrimes * 3. All advertising materials mentioning features or use of this software 141573Srgrimes * must display the following acknowledgement: 151573Srgrimes * This product includes software developed by the University of 161573Srgrimes * California, Berkeley and its contributors. 171573Srgrimes * 4. Neither the name of the University nor the names of its contributors 181573Srgrimes * may be used to endorse or promote products derived from this software 191573Srgrimes * without specific prior written permission. 201573Srgrimes * 211573Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241573Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281573Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301573Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311573Srgrimes * SUCH DAMAGE. 321573Srgrimes */ 331573Srgrimes 341573Srgrimes#if defined(LIBC_SCCS) && !defined(lint) 351573Srgrimesstatic char sccsid[] = "@(#)strtouq.c 8.1 (Berkeley) 6/4/93"; 361573Srgrimes#endif /* LIBC_SCCS and not lint */ 371573Srgrimes 3873152Sobrien#ifndef lint 3973152Sobrienstatic const char rcsid[] = 4073152Sobrien "$FreeBSD: head/lib/libc/stdlib/strtoull.c 82975 2001-09-04 16:39:11Z ache $"; 4173152Sobrien#endif 4273152Sobrien 431573Srgrimes#include <sys/types.h> 441573Srgrimes 451573Srgrimes#include <limits.h> 461573Srgrimes#include <errno.h> 471573Srgrimes#include <ctype.h> 481573Srgrimes#include <stdlib.h> 491573Srgrimes 501573Srgrimes/* 5173152Sobrien * Convert a string to an unsigned long long integer. 521573Srgrimes * 5382975Sache * Assumes that the upper and lower case 541573Srgrimes * alphabets and digits are each contiguous. 551573Srgrimes */ 5673152Sobrienunsigned long long 5773152Sobrienstrtoull(nptr, endptr, base) 581573Srgrimes const char *nptr; 591573Srgrimes char **endptr; 601573Srgrimes register int base; 611573Srgrimes{ 6282975Sache register const char *s; 6373152Sobrien register unsigned long long acc; 649845Sache register unsigned char c; 6582975Sache register unsigned long long cutoff; 661573Srgrimes register int neg, any, cutlim; 671573Srgrimes 681573Srgrimes /* 691573Srgrimes * See strtoq for comments as to the logic used. 701573Srgrimes */ 711573Srgrimes s = nptr; 721573Srgrimes do { 731573Srgrimes c = *s++; 741573Srgrimes } while (isspace(c)); 751573Srgrimes if (c == '-') { 761573Srgrimes neg = 1; 771573Srgrimes c = *s++; 788870Srgrimes } else { 791573Srgrimes neg = 0; 801573Srgrimes if (c == '+') 811573Srgrimes c = *s++; 821573Srgrimes } 831573Srgrimes if ((base == 0 || base == 16) && 841573Srgrimes c == '0' && (*s == 'x' || *s == 'X')) { 851573Srgrimes c = s[1]; 861573Srgrimes s += 2; 871573Srgrimes base = 16; 881573Srgrimes } 891573Srgrimes if (base == 0) 901573Srgrimes base = c == '0' ? 8 : 10; 9182975Sache any = 0; 9282975Sache if (base < 2 || base > 36) 9382975Sache goto noconv; 9482975Sache 9582975Sache cutoff = ULLONG_MAX / base; 9682975Sache cutlim = ULLONG_MAX % base; 9782975Sache for (acc = 0; ; c = *s++) { 989845Sache if (!isascii(c)) 999845Sache break; 1001573Srgrimes if (isdigit(c)) 1011573Srgrimes c -= '0'; 1021573Srgrimes else if (isalpha(c)) 1031573Srgrimes c -= isupper(c) ? 'A' - 10 : 'a' - 10; 1041573Srgrimes else 1051573Srgrimes break; 1061573Srgrimes if (c >= base) 1071573Srgrimes break; 10817141Sjkh if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 1091573Srgrimes any = -1; 1101573Srgrimes else { 1111573Srgrimes any = 1; 11282975Sache acc *= base; 1131573Srgrimes acc += c; 1141573Srgrimes } 1151573Srgrimes } 1161573Srgrimes if (any < 0) { 11773152Sobrien acc = ULLONG_MAX; 1181573Srgrimes errno = ERANGE; 11982975Sache } else if (!any) { 12082975Sachenoconv: 12182975Sache errno = EINVAL; 1221573Srgrimes } else if (neg) 1231573Srgrimes acc = -acc; 12482975Sache if (endptr != NULL) 1251573Srgrimes *endptr = (char *)(any ? s - 1 : nptr); 1261573Srgrimes return (acc); 1271573Srgrimes} 128