strtoul.c revision 227753
11573Srgrimes/* 21573Srgrimes * Copyright (c) 1990, 1993 31573Srgrimes * The Regents of the University of California. All rights reserved. 41573Srgrimes * 5227753Stheraven * Copyright (c) 2011 The FreeBSD Foundation 6227753Stheraven * All rights reserved. 7227753Stheraven * Portions of this software were developed by David Chisnall 8227753Stheraven * under sponsorship from the FreeBSD Foundation. 9227753Stheraven * 101573Srgrimes * Redistribution and use in source and binary forms, with or without 111573Srgrimes * modification, are permitted provided that the following conditions 121573Srgrimes * are met: 131573Srgrimes * 1. Redistributions of source code must retain the above copyright 141573Srgrimes * notice, this list of conditions and the following disclaimer. 151573Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 161573Srgrimes * notice, this list of conditions and the following disclaimer in the 171573Srgrimes * documentation and/or other materials provided with the distribution. 181573Srgrimes * 4. Neither the name of the University nor the names of its contributors 191573Srgrimes * may be used to endorse or promote products derived from this software 201573Srgrimes * without specific prior written permission. 211573Srgrimes * 221573Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 231573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 241573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 251573Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 261573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 271573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 281573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 291573Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 301573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 311573Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 321573Srgrimes * SUCH DAMAGE. 331573Srgrimes */ 341573Srgrimes 351573Srgrimes#if defined(LIBC_SCCS) && !defined(lint) 361573Srgrimesstatic char sccsid[] = "@(#)strtoul.c 8.1 (Berkeley) 6/4/93"; 371573Srgrimes#endif /* LIBC_SCCS and not lint */ 3892986Sobrien#include <sys/cdefs.h> 3992986Sobrien__FBSDID("$FreeBSD: head/lib/libc/stdlib/strtoul.c 227753 2011-11-20 14:45:42Z theraven $"); 401573Srgrimes 411573Srgrimes#include <limits.h> 421573Srgrimes#include <ctype.h> 431573Srgrimes#include <errno.h> 441573Srgrimes#include <stdlib.h> 45227753Stheraven#include "xlocale_private.h" 461573Srgrimes 471573Srgrimes/* 481573Srgrimes * Convert a string to an unsigned long integer. 491573Srgrimes * 5082975Sache * Assumes that the upper and lower case 511573Srgrimes * alphabets and digits are each contiguous. 521573Srgrimes */ 531573Srgrimesunsigned long 54227753Stheravenstrtoul_l(const char * __restrict nptr, char ** __restrict endptr, int base, locale_t locale) 551573Srgrimes{ 5687016Sache const char *s; 5787016Sache unsigned long acc; 5887494Sache char c; 5987016Sache unsigned long cutoff; 6087494Sache int neg, any, cutlim; 61227753Stheraven FIX_LOCALE(locale); 621573Srgrimes 631573Srgrimes /* 641573Srgrimes * See strtol for comments as to the logic used. 651573Srgrimes */ 6682975Sache s = nptr; 671573Srgrimes do { 681573Srgrimes c = *s++; 69227753Stheraven } while (isspace_l((unsigned char)c, locale)); 701573Srgrimes if (c == '-') { 711573Srgrimes neg = 1; 721573Srgrimes c = *s++; 7382975Sache } else { 7482975Sache neg = 0; 7582975Sache if (c == '+') 7682975Sache c = *s++; 7782975Sache } 781573Srgrimes if ((base == 0 || base == 16) && 79140536Sache c == '0' && (*s == 'x' || *s == 'X') && 80140577Sache ((s[1] >= '0' && s[1] <= '9') || 81140577Sache (s[1] >= 'A' && s[1] <= 'F') || 82140577Sache (s[1] >= 'a' && s[1] <= 'f'))) { 831573Srgrimes c = s[1]; 841573Srgrimes s += 2; 851573Srgrimes base = 16; 861573Srgrimes } 871573Srgrimes if (base == 0) 881573Srgrimes base = c == '0' ? 8 : 10; 8982982Sache acc = any = 0; 9087023Sfenner if (base < 2 || base > 36) 9182975Sache goto noconv; 9282975Sache 9382975Sache cutoff = ULONG_MAX / base; 9482975Sache cutlim = ULONG_MAX % base; 9582982Sache for ( ; ; c = *s++) { 9687494Sache if (c >= '0' && c <= '9') 9787494Sache c -= '0'; 9887494Sache else if (c >= 'A' && c <= 'Z') 9987494Sache c -= 'A' - 10; 10087494Sache else if (c >= 'a' && c <= 'z') 10187494Sache c -= 'a' - 10; 1021573Srgrimes else 1031573Srgrimes break; 10487494Sache if (c >= base) 1051573Srgrimes break; 10687494Sache if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 1071573Srgrimes any = -1; 1081573Srgrimes else { 1091573Srgrimes any = 1; 1101573Srgrimes acc *= base; 11187494Sache acc += c; 1121573Srgrimes } 1131573Srgrimes } 1141573Srgrimes if (any < 0) { 1151573Srgrimes acc = ULONG_MAX; 1161573Srgrimes errno = ERANGE; 11782975Sache } else if (!any) { 11882975Sachenoconv: 11982975Sache errno = EINVAL; 1201573Srgrimes } else if (neg) 1211573Srgrimes acc = -acc; 12282975Sache if (endptr != NULL) 1231573Srgrimes *endptr = (char *)(any ? s - 1 : nptr); 1241573Srgrimes return (acc); 1251573Srgrimes} 126227753Stheravenunsigned long 127227753Stheravenstrtoul(const char * __restrict nptr, char ** __restrict endptr, int base) 128227753Stheraven{ 129227753Stheraven return strtoul_l(nptr, endptr, base, __get_locale()); 130227753Stheraven} 131