1 /* $NetBSD: strtoul.c,v 1.5 2014/12/10 04:37:59 christos Exp $ */ 2 3 /* 4 * Copyright (C) 2004, 2005, 2007, 2014 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. Neither the name of the University nor the names of its contributors 33 * may be used to endorse or promote products derived from this software 34 * without specific prior written permission. 35 * 36 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 37 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 39 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 40 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 41 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 42 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 44 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 45 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 46 * SUCH DAMAGE. 47 */ 48 49 /*! \file */ 50 #if defined(LIBC_SCCS) && !defined(lint) 51 static char sccsid[] = "@(#)strtoul.c 8.1 (Berkeley) 6/4/93"; 52 #endif /* LIBC_SCCS and not lint */ 53 54 /* Id: strtoul.c,v 1.7 2007/06/19 23:47:17 tbox Exp */ 55 56 #include <config.h> 57 58 #include <limits.h> 59 #include <ctype.h> 60 #include <errno.h> 61 62 #include <isc/stdlib.h> 63 #include <isc/util.h> 64 65 /*! 66 * Convert a string to an unsigned long integer. 67 * 68 * Ignores `locale' stuff. Assumes that the upper and lower case 69 * alphabets and digits are each contiguous. 70 */ 71 unsigned long 72 isc_strtoul(const char *nptr, char **endptr, int base) { 73 const char *s = nptr; 74 unsigned long acc; 75 unsigned char c; 76 unsigned long cutoff; 77 int neg = 0, any, cutlim; 78 79 /* 80 * See strtol for comments as to the logic used. 81 */ 82 do { 83 c = *s++; 84 } while (isspace(c)); 85 if (c == '-') { 86 neg = 1; 87 c = *s++; 88 } else if (c == '+') 89 c = *s++; 90 if ((base == 0 || base == 16) && 91 c == '0' && (*s == 'x' || *s == 'X')) { 92 c = s[1]; 93 s += 2; 94 base = 16; 95 } 96 if (base == 0) 97 base = c == '0' ? 8 : 10; 98 cutoff = (unsigned long)ULONG_MAX / (unsigned long)base; 99 cutlim = (unsigned long)ULONG_MAX % (unsigned long)base; 100 for (acc = 0, any = 0;; c = *s++) { 101 if (!isascii(c)) 102 break; 103 if (isdigit(c)) 104 c -= '0'; 105 else if (isalpha(c)) 106 c -= isupper(c) ? 'A' - 10 : 'a' - 10; 107 else 108 break; 109 if (c >= base) 110 break; 111 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 112 any = -1; 113 else { 114 any = 1; 115 acc *= base; 116 acc += c; 117 } 118 } 119 if (any < 0) { 120 acc = ULONG_MAX; 121 errno = ERANGE; 122 } else if (neg) 123 acc = -acc; 124 if (endptr != 0) 125 DE_CONST(any ? s - 1 : nptr, *endptr); 126 return (acc); 127 } 128