1258945Sroberto/* 2258945Sroberto * Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC") 3258945Sroberto * Copyright (C) 2003 Internet Software Consortium. 4258945Sroberto * 5258945Sroberto * Permission to use, copy, modify, and/or distribute this software for any 6258945Sroberto * purpose with or without fee is hereby granted, provided that the above 7258945Sroberto * copyright notice and this permission notice appear in all copies. 8258945Sroberto * 9258945Sroberto * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH 10258945Sroberto * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 11258945Sroberto * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, 12258945Sroberto * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 13258945Sroberto * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE 14258945Sroberto * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 15258945Sroberto * PERFORMANCE OF THIS SOFTWARE. 16258945Sroberto */ 17258945Sroberto 18258945Sroberto/* 19258945Sroberto * Copyright (c) 1990, 1993 20258945Sroberto * The Regents of the University of California. All rights reserved. 21258945Sroberto * 22258945Sroberto * Redistribution and use in source and binary forms, with or without 23258945Sroberto * modification, are permitted provided that the following conditions 24258945Sroberto * are met: 25258945Sroberto * 1. Redistributions of source code must retain the above copyright 26258945Sroberto * notice, this list of conditions and the following disclaimer. 27258945Sroberto * 2. Redistributions in binary form must reproduce the above copyright 28258945Sroberto * notice, this list of conditions and the following disclaimer in the 29258945Sroberto * documentation and/or other materials provided with the distribution. 30258945Sroberto * 3. All advertising materials mentioning features or use of this software 31258945Sroberto * must display the following acknowledgement: 32258945Sroberto * This product includes software developed by the University of 33258945Sroberto * California, Berkeley and its contributors. 34258945Sroberto * 4. Neither the name of the University nor the names of its contributors 35258945Sroberto * may be used to endorse or promote products derived from this software 36258945Sroberto * without specific prior written permission. 37258945Sroberto * 38258945Sroberto * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 39258945Sroberto * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 40258945Sroberto * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 41258945Sroberto * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 42258945Sroberto * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 43258945Sroberto * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 44258945Sroberto * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 45258945Sroberto * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 46258945Sroberto * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 47258945Sroberto * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 48258945Sroberto * SUCH DAMAGE. 49258945Sroberto */ 50258945Sroberto 51258945Sroberto/*! \file */ 52258945Sroberto#if defined(LIBC_SCCS) && !defined(lint) 53258945Srobertostatic char sccsid[] = "@(#)strtoul.c 8.1 (Berkeley) 6/4/93"; 54258945Sroberto#endif /* LIBC_SCCS and not lint */ 55258945Sroberto 56258945Sroberto/* $Id: strtoul.c,v 1.7 2007/06/19 23:47:17 tbox Exp $ */ 57258945Sroberto 58258945Sroberto#include <config.h> 59258945Sroberto 60258945Sroberto#include <limits.h> 61258945Sroberto#include <ctype.h> 62258945Sroberto#include <errno.h> 63258945Sroberto 64258945Sroberto#include <isc/stdlib.h> 65258945Sroberto#include <isc/util.h> 66258945Sroberto 67258945Sroberto/*! 68258945Sroberto * Convert a string to an unsigned long integer. 69258945Sroberto * 70258945Sroberto * Ignores `locale' stuff. Assumes that the upper and lower case 71258945Sroberto * alphabets and digits are each contiguous. 72258945Sroberto */ 73258945Srobertounsigned long 74258945Srobertoisc_strtoul(const char *nptr, char **endptr, int base) { 75258945Sroberto const char *s = nptr; 76258945Sroberto unsigned long acc; 77258945Sroberto unsigned char c; 78258945Sroberto unsigned long cutoff; 79258945Sroberto int neg = 0, any, cutlim; 80258945Sroberto 81258945Sroberto /* 82258945Sroberto * See strtol for comments as to the logic used. 83258945Sroberto */ 84258945Sroberto do { 85258945Sroberto c = *s++; 86258945Sroberto } while (isspace(c)); 87258945Sroberto if (c == '-') { 88258945Sroberto neg = 1; 89258945Sroberto c = *s++; 90258945Sroberto } else if (c == '+') 91258945Sroberto c = *s++; 92258945Sroberto if ((base == 0 || base == 16) && 93258945Sroberto c == '0' && (*s == 'x' || *s == 'X')) { 94258945Sroberto c = s[1]; 95258945Sroberto s += 2; 96258945Sroberto base = 16; 97258945Sroberto } 98258945Sroberto if (base == 0) 99258945Sroberto base = c == '0' ? 8 : 10; 100258945Sroberto cutoff = (unsigned long)ULONG_MAX / (unsigned long)base; 101258945Sroberto cutlim = (unsigned long)ULONG_MAX % (unsigned long)base; 102258945Sroberto for (acc = 0, any = 0;; c = *s++) { 103258945Sroberto if (!isascii(c)) 104258945Sroberto break; 105258945Sroberto if (isdigit(c)) 106258945Sroberto c -= '0'; 107258945Sroberto else if (isalpha(c)) 108258945Sroberto c -= isupper(c) ? 'A' - 10 : 'a' - 10; 109258945Sroberto else 110258945Sroberto break; 111258945Sroberto if (c >= base) 112258945Sroberto break; 113258945Sroberto if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 114258945Sroberto any = -1; 115258945Sroberto else { 116258945Sroberto any = 1; 117258945Sroberto acc *= base; 118258945Sroberto acc += c; 119258945Sroberto } 120258945Sroberto } 121258945Sroberto if (any < 0) { 122258945Sroberto acc = ULONG_MAX; 123258945Sroberto errno = ERANGE; 124258945Sroberto } else if (neg) 125258945Sroberto acc = -acc; 126258945Sroberto if (endptr != 0) 127258945Sroberto DE_CONST(any ? s - 1 : nptr, *endptr); 128258945Sroberto return (acc); 129258945Sroberto} 130