1248613Sdes/* $OpenBSD: strtoull.c,v 1.5 2005/08/08 08:05:37 espie Exp $ */ 2248613Sdes/*- 3248613Sdes * Copyright (c) 1992 The Regents of the University of California. 4248613Sdes * All rights reserved. 5248613Sdes * 6248613Sdes * Redistribution and use in source and binary forms, with or without 7248613Sdes * modification, are permitted provided that the following conditions 8248613Sdes * are met: 9248613Sdes * 1. Redistributions of source code must retain the above copyright 10248613Sdes * notice, this list of conditions and the following disclaimer. 11248613Sdes * 2. Redistributions in binary form must reproduce the above copyright 12248613Sdes * notice, this list of conditions and the following disclaimer in the 13248613Sdes * documentation and/or other materials provided with the distribution. 14248613Sdes * 3. Neither the name of the University nor the names of its contributors 15248613Sdes * may be used to endorse or promote products derived from this software 16248613Sdes * without specific prior written permission. 17248613Sdes * 18248613Sdes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19248613Sdes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20248613Sdes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21248613Sdes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22248613Sdes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23248613Sdes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24248613Sdes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25248613Sdes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26248613Sdes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27248613Sdes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28248613Sdes * SUCH DAMAGE. 29248613Sdes */ 30248613Sdes 31248613Sdes/* OPENBSD ORIGINAL: lib/libc/stdlib/strtoull.c */ 32248613Sdes 33248613Sdes#include "includes.h" 34248613Sdes#ifndef HAVE_STRTOULL 35248613Sdes 36248613Sdes#include <sys/types.h> 37248613Sdes 38248613Sdes#include <ctype.h> 39248613Sdes#include <errno.h> 40248613Sdes#include <limits.h> 41248613Sdes#include <stdlib.h> 42248613Sdes 43248613Sdes/* 44248613Sdes * Convert a string to an unsigned long long. 45248613Sdes * 46248613Sdes * Ignores `locale' stuff. Assumes that the upper and lower case 47248613Sdes * alphabets and digits are each contiguous. 48248613Sdes */ 49248613Sdesunsigned long long 50248613Sdesstrtoull(const char *nptr, char **endptr, int base) 51248613Sdes{ 52248613Sdes const char *s; 53248613Sdes unsigned long long acc, cutoff; 54248613Sdes int c; 55248613Sdes int neg, any, cutlim; 56248613Sdes 57248613Sdes /* 58248613Sdes * See strtoq for comments as to the logic used. 59248613Sdes */ 60248613Sdes s = nptr; 61248613Sdes do { 62248613Sdes c = (unsigned char) *s++; 63248613Sdes } while (isspace(c)); 64248613Sdes if (c == '-') { 65248613Sdes neg = 1; 66248613Sdes c = *s++; 67248613Sdes } else { 68248613Sdes neg = 0; 69248613Sdes if (c == '+') 70248613Sdes c = *s++; 71248613Sdes } 72248613Sdes if ((base == 0 || base == 16) && 73248613Sdes c == '0' && (*s == 'x' || *s == 'X')) { 74248613Sdes c = s[1]; 75248613Sdes s += 2; 76248613Sdes base = 16; 77248613Sdes } 78248613Sdes if (base == 0) 79248613Sdes base = c == '0' ? 8 : 10; 80248613Sdes 81248613Sdes cutoff = ULLONG_MAX / (unsigned long long)base; 82248613Sdes cutlim = ULLONG_MAX % (unsigned long long)base; 83248613Sdes for (acc = 0, any = 0;; c = (unsigned char) *s++) { 84248613Sdes if (isdigit(c)) 85248613Sdes c -= '0'; 86248613Sdes else if (isalpha(c)) 87248613Sdes c -= isupper(c) ? 'A' - 10 : 'a' - 10; 88248613Sdes else 89248613Sdes break; 90248613Sdes if (c >= base) 91248613Sdes break; 92248613Sdes if (any < 0) 93248613Sdes continue; 94248613Sdes if (acc > cutoff || (acc == cutoff && c > cutlim)) { 95248613Sdes any = -1; 96248613Sdes acc = ULLONG_MAX; 97248613Sdes errno = ERANGE; 98248613Sdes } else { 99248613Sdes any = 1; 100248613Sdes acc *= (unsigned long long)base; 101248613Sdes acc += c; 102248613Sdes } 103248613Sdes } 104248613Sdes if (neg && any > 0) 105248613Sdes acc = -acc; 106248613Sdes if (endptr != 0) 107248613Sdes *endptr = (char *) (any ? s - 1 : nptr); 108248613Sdes return (acc); 109248613Sdes} 110248613Sdes#endif /* !HAVE_STRTOULL */ 111