1/* $Id: strtoul.c 276 2010-06-30 12:18:30Z nijtmans $ */ 2 3/* 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32#if 0 33static char sccsid[] = "@(#)strtoul.c 8.1 (Berkeley) 6/4/93"; 34__RCSID("$NetBSD: strtoul.c,v 1.16 2003/08/07 16:43:45 agc Exp $"); 35#endif 36 37#include <ctype.h> 38#include <errno.h> 39#include <limits.h> 40#include <stdlib.h> 41 42/* 43 * Convert a string to an unsigned long integer. 44 * 45 * Ignores `locale' stuff. Assumes that the upper and lower case 46 * alphabets and digits are each contiguous. 47 */ 48unsigned long 49strtoul(const char *nptr, char **endptr, int base) 50{ 51 const char *s; 52 unsigned long acc, cutoff; 53 int c; 54 int neg, any, cutlim; 55 56 /* 57 * See strtol for comments as to the logic used. 58 */ 59 s = nptr; 60 do { 61 c = (unsigned char) *s++; 62 } while (isspace(c)); 63 if (c == '-') { 64 neg = 1; 65 c = *s++; 66 } else { 67 neg = 0; 68 if (c == '+') 69 c = *s++; 70 } 71 if ((base == 0 || base == 16) && 72 c == '0' && (*s == 'x' || *s == 'X')) { 73 c = s[1]; 74 s += 2; 75 base = 16; 76 } 77 if (base == 0) 78 base = c == '0' ? 8 : 10; 79 80 cutoff = ULONG_MAX / (unsigned long)base; 81 cutlim = (int)(ULONG_MAX % (unsigned long)base); 82 for (acc = 0, any = 0;; c = (unsigned char) *s++) { 83 if (isdigit(c)) 84 c -= '0'; 85 else if (isalpha(c)) 86 c -= isupper(c) ? 'A' - 10 : 'a' - 10; 87 else 88 break; 89 if (c >= base) 90 break; 91 if (any < 0) 92 continue; 93 if (acc > cutoff || (acc == cutoff && c > cutlim)) { 94 any = -1; 95 acc = ULONG_MAX; 96 errno = ERANGE; 97 } else { 98 any = 1; 99 acc *= (unsigned long)base; 100 acc += c; 101 } 102 } 103 if (neg && any > 0) 104 acc = -acc; 105 if (endptr != 0) 106 /* LINTED interface specification */ 107 *endptr = (char *)(any ? s - 1 : nptr); 108 return (acc); 109} 110/* 111 * Local Variables: 112 * mode: c 113 * c-basic-offset: 8 114 * fill-column: 78 115 * End: 116 */ 117