1/* 2 * Copyright (C) 2004, 2005, 2007, 2012 Internet Systems Consortium, Inc. ("ISC") 3 * Copyright (C) 2003 Internet Software Consortium. 4 * 5 * Permission to use, copy, modify, and/or distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH 10 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 11 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, 12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 13 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE 14 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 15 * PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18/* 19 * Copyright (c) 1990, 1993 20 * The Regents of the University of California. All rights reserved. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the above copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 3. All advertising materials mentioning features or use of this software 31 * must display the following acknowledgement: 32 * This product includes software developed by the University of 33 * California, Berkeley and its contributors. 34 * 4. Neither the name of the University nor the names of its contributors 35 * may be used to endorse or promote products derived from this software 36 * without specific prior written permission. 37 * 38 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 39 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 41 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 42 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 43 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 44 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 45 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 46 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 47 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 48 * SUCH DAMAGE. 49 */ 50 51/*! \file */ 52#if defined(LIBC_SCCS) && !defined(lint) 53static char sccsid[] = "@(#)strtoul.c 8.1 (Berkeley) 6/4/93"; 54#endif /* LIBC_SCCS and not lint */ 55 56/* $Id$ */ 57 58#include <config.h> 59 60#include <limits.h> 61#include <ctype.h> 62#include <errno.h> 63 64#include <lwres/stdlib.h> 65 66#define DE_CONST(konst, var) \ 67 do { \ 68 union { const void *k; void *v; } _u; \ 69 _u.k = konst; \ 70 var = _u.v; \ 71 } while (0) 72 73/*! 74 * Convert a string to an unsigned long integer. 75 * 76 * Ignores `locale' stuff. Assumes that the upper and lower case 77 * alphabets and digits are each contiguous. 78 */ 79unsigned long 80lwres_strtoul(const char *nptr, char **endptr, int base) { 81 const char *s = nptr; 82 unsigned long acc; 83 unsigned char c; 84 unsigned long cutoff; 85 int neg = 0, any, cutlim; 86 87 /* 88 * See strtol for comments as to the logic used. 89 */ 90 do { 91 c = *s++; 92 } while (isspace(c)); 93 if (c == '-') { 94 neg = 1; 95 c = *s++; 96 } else if (c == '+') 97 c = *s++; 98 if ((base == 0 || base == 16) && 99 c == '0' && (*s == 'x' || *s == 'X')) { 100 c = s[1]; 101 s += 2; 102 base = 16; 103 } 104 if (base == 0) 105 base = c == '0' ? 8 : 10; 106 cutoff = (unsigned long)ULONG_MAX / (unsigned long)base; 107 cutlim = (unsigned long)ULONG_MAX % (unsigned long)base; 108 for (acc = 0, any = 0;; c = *s++) { 109 if (!isascii(c)) 110 break; 111 if (isdigit(c)) 112 c -= '0'; 113 else if (isalpha(c)) 114 c -= isupper(c) ? 'A' - 10 : 'a' - 10; 115 else 116 break; 117 if (c >= base) 118 break; 119 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 120 any = -1; 121 else { 122 any = 1; 123 acc *= base; 124 acc += c; 125 } 126 } 127 if (any < 0) { 128 acc = ULONG_MAX; 129 errno = ERANGE; 130 } else if (neg) 131 acc = -acc; 132 if (endptr != 0) 133 DE_CONST(any ? s - 1 : nptr, *endptr); 134 return (acc); 135} 136