10SN/A/* $OpenBSD: strtoll.c,v 1.6 2005/11/10 10:00:17 espie Exp $ */ 22362SN/A/*- 30SN/A * Copyright (c) 1992 The Regents of the University of California. 40SN/A * All rights reserved. 50SN/A * 60SN/A * Redistribution and use in source and binary forms, with or without 72362SN/A * modification, are permitted provided that the following conditions 80SN/A * are met: 92362SN/A * 1. Redistributions of source code must retain the above copyright 100SN/A * notice, this list of conditions and the following disclaimer. 110SN/A * 2. Redistributions in binary form must reproduce the above copyright 120SN/A * notice, this list of conditions and the following disclaimer in the 130SN/A * documentation and/or other materials provided with the distribution. 140SN/A * 3. Neither the name of the University nor the names of its contributors 150SN/A * may be used to endorse or promote products derived from this software 160SN/A * without specific prior written permission. 170SN/A * 180SN/A * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 190SN/A * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 200SN/A * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 212362SN/A * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 222362SN/A * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 232362SN/A * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 240SN/A * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 250SN/A * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 260SN/A * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 270SN/A * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 280SN/A * SUCH DAMAGE. 290SN/A */ 300SN/A 310SN/A/* OPENBSD ORIGINAL: lib/libc/stdlib/strtoll.c */ 320SN/A 330SN/A#include "includes.h" 340SN/A#ifndef HAVE_STRTOLL 350SN/A 360SN/A#include <sys/types.h> 370SN/A 380SN/A#include <ctype.h> 390SN/A#include <errno.h> 400SN/A#include <limits.h> 410SN/A#include <stdlib.h> 420SN/A 430SN/A/* 440SN/A * Convert a string to a long long. 450SN/A * 460SN/A * Ignores `locale' stuff. Assumes that the upper and lower case 470SN/A * alphabets and digits are each contiguous. 480SN/A */ 490SN/Along long 500SN/Astrtoll(const char *nptr, char **endptr, int base) 510SN/A{ 520SN/A const char *s; 530SN/A long long acc, cutoff; 540SN/A int c; 550SN/A int neg, any, cutlim; 560SN/A 570SN/A /* 580SN/A * Skip white space and pick up leading +/- sign if any. 590SN/A * If base is 0, allow 0x for hex and 0 for octal, else 600SN/A * assume decimal; if base is already 16, allow 0x. 610SN/A */ 620SN/A s = nptr; 630SN/A do { 640SN/A c = (unsigned char) *s++; 65 } while (isspace(c)); 66 if (c == '-') { 67 neg = 1; 68 c = *s++; 69 } else { 70 neg = 0; 71 if (c == '+') 72 c = *s++; 73 } 74 if ((base == 0 || base == 16) && 75 c == '0' && (*s == 'x' || *s == 'X')) { 76 c = s[1]; 77 s += 2; 78 base = 16; 79 } 80 if (base == 0) 81 base = c == '0' ? 8 : 10; 82 83 /* 84 * Compute the cutoff value between legal numbers and illegal 85 * numbers. That is the largest legal value, divided by the 86 * base. An input number that is greater than this value, if 87 * followed by a legal input character, is too big. One that 88 * is equal to this value may be valid or not; the limit 89 * between valid and invalid numbers is then based on the last 90 * digit. For instance, if the range for long longs is 91 * [-9223372036854775808..9223372036854775807] and the input base 92 * is 10, cutoff will be set to 922337203685477580 and cutlim to 93 * either 7 (neg==0) or 8 (neg==1), meaning that if we have 94 * accumulated a value > 922337203685477580, or equal but the 95 * next digit is > 7 (or 8), the number is too big, and we will 96 * return a range error. 97 * 98 * Set any if any `digits' consumed; make it negative to indicate 99 * overflow. 100 */ 101 cutoff = neg ? LLONG_MIN : LLONG_MAX; 102 cutlim = cutoff % base; 103 cutoff /= base; 104 if (neg) { 105 if (cutlim > 0) { 106 cutlim -= base; 107 cutoff += 1; 108 } 109 cutlim = -cutlim; 110 } 111 for (acc = 0, any = 0;; c = (unsigned char) *s++) { 112 if (isdigit(c)) 113 c -= '0'; 114 else if (isalpha(c)) 115 c -= isupper(c) ? 'A' - 10 : 'a' - 10; 116 else 117 break; 118 if (c >= base) 119 break; 120 if (any < 0) 121 continue; 122 if (neg) { 123 if (acc < cutoff || (acc == cutoff && c > cutlim)) { 124 any = -1; 125 acc = LLONG_MIN; 126 errno = ERANGE; 127 } else { 128 any = 1; 129 acc *= base; 130 acc -= c; 131 } 132 } else { 133 if (acc > cutoff || (acc == cutoff && c > cutlim)) { 134 any = -1; 135 acc = LLONG_MAX; 136 errno = ERANGE; 137 } else { 138 any = 1; 139 acc *= base; 140 acc += c; 141 } 142 } 143 } 144 if (endptr != 0) 145 *endptr = (char *) (any ? s - 1 : nptr); 146 return (acc); 147} 148#endif /* HAVE_STRTOLL */ 149