1/* $NetBSD: strtoul.c,v 1.1.1.1 2009/12/13 16:54:19 kardel Exp $ */ 2 3/* 4 * Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC") 5 * Copyright (C) 2003 Internet Software Consortium. 6 * 7 * Permission to use, copy, modify, and/or distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH 12 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 13 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, 14 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 15 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE 16 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 17 * PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20/* 21 * Copyright (c) 1990, 1993 22 * The Regents of the University of California. All rights reserved. 23 * 24 * Redistribution and use in source and binary forms, with or without 25 * modification, are permitted provided that the following conditions 26 * are met: 27 * 1. Redistributions of source code must retain the above copyright 28 * notice, this list of conditions and the following disclaimer. 29 * 2. Redistributions in binary form must reproduce the above copyright 30 * notice, this list of conditions and the following disclaimer in the 31 * documentation and/or other materials provided with the distribution. 32 * 3. All advertising materials mentioning features or use of this software 33 * must display the following acknowledgement: 34 * This product includes software developed by the University of 35 * California, Berkeley and its contributors. 36 * 4. Neither the name of the University nor the names of its contributors 37 * may be used to endorse or promote products derived from this software 38 * without specific prior written permission. 39 * 40 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 */ 52 53/*! \file */ 54#if defined(LIBC_SCCS) && !defined(lint) 55static char sccsid[] = "@(#)strtoul.c 8.1 (Berkeley) 6/4/93"; 56#endif /* LIBC_SCCS and not lint */ 57 58/* Id: strtoul.c,v 1.7 2007/06/19 23:47:17 tbox Exp */ 59 60#include <config.h> 61 62#include <limits.h> 63#include <ctype.h> 64#include <errno.h> 65 66#include <isc/stdlib.h> 67#include <isc/util.h> 68 69/*! 70 * Convert a string to an unsigned long integer. 71 * 72 * Ignores `locale' stuff. Assumes that the upper and lower case 73 * alphabets and digits are each contiguous. 74 */ 75unsigned long 76isc_strtoul(const char *nptr, char **endptr, int base) { 77 const char *s = nptr; 78 unsigned long acc; 79 unsigned char c; 80 unsigned long cutoff; 81 int neg = 0, any, cutlim; 82 83 /* 84 * See strtol for comments as to the logic used. 85 */ 86 do { 87 c = *s++; 88 } while (isspace(c)); 89 if (c == '-') { 90 neg = 1; 91 c = *s++; 92 } else if (c == '+') 93 c = *s++; 94 if ((base == 0 || base == 16) && 95 c == '0' && (*s == 'x' || *s == 'X')) { 96 c = s[1]; 97 s += 2; 98 base = 16; 99 } 100 if (base == 0) 101 base = c == '0' ? 8 : 10; 102 cutoff = (unsigned long)ULONG_MAX / (unsigned long)base; 103 cutlim = (unsigned long)ULONG_MAX % (unsigned long)base; 104 for (acc = 0, any = 0;; c = *s++) { 105 if (!isascii(c)) 106 break; 107 if (isdigit(c)) 108 c -= '0'; 109 else if (isalpha(c)) 110 c -= isupper(c) ? 'A' - 10 : 'a' - 10; 111 else 112 break; 113 if (c >= base) 114 break; 115 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 116 any = -1; 117 else { 118 any = 1; 119 acc *= base; 120 acc += c; 121 } 122 } 123 if (any < 0) { 124 acc = ULONG_MAX; 125 errno = ERANGE; 126 } else if (neg) 127 acc = -acc; 128 if (endptr != 0) 129 DE_CONST(any ? s - 1 : nptr, *endptr); 130 return (acc); 131} 132