1 /* $NetBSD: strtoll.c,v 1.2 2017/01/28 21:31:50 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Copyright (c) 2011 The FreeBSD Foundation 8 * All rights reserved. 9 * Portions of this software were developed by David Chisnall 10 * under sponsorship from the FreeBSD Foundation. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #include <config.h> 38 39 #include <string.h> 40 41 #include <krb5/roken.h> 42 43 /* #include <sys/cdefs.h> */ 44 45 #include <limits.h> 46 #include <errno.h> 47 #include <ctype.h> 48 #include <stdlib.h> 49 #include <stdint.h> 50 51 /* 52 * Convert a string to a long long integer. 53 * 54 * Assumes that the upper and lower case 55 * alphabets and digits are each contiguous. 56 */ 57 ROKEN_LIB_FUNCTION long long ROKEN_LIB_CALL 58 strtoll(const char * nptr, char ** endptr, int base) 59 { 60 const char *s; 61 unsigned long long acc; 62 char c; 63 unsigned long long cutoff; 64 int neg, any, cutlim; 65 66 /* 67 * Skip white space and pick up leading +/- sign if any. 68 * If base is 0, allow 0x for hex and 0 for octal, else 69 * assume decimal; if base is already 16, allow 0x. 70 */ 71 s = nptr; 72 do { 73 c = *s++; 74 } while (isspace((unsigned char)c)); 75 if (c == '-') { 76 neg = 1; 77 c = *s++; 78 } else { 79 neg = 0; 80 if (c == '+') 81 c = *s++; 82 } 83 if ((base == 0 || base == 16) && 84 c == '0' && (*s == 'x' || *s == 'X') && 85 ((s[1] >= '0' && s[1] <= '9') || 86 (s[1] >= 'A' && s[1] <= 'F') || 87 (s[1] >= 'a' && s[1] <= 'f'))) { 88 c = s[1]; 89 s += 2; 90 base = 16; 91 } 92 if (base == 0) 93 base = c == '0' ? 8 : 10; 94 acc = any = 0; 95 if (base < 2 || base > 36) 96 goto noconv; 97 98 /* 99 * Compute the cutoff value between legal numbers and illegal 100 * numbers. That is the largest legal value, divided by the 101 * base. An input number that is greater than this value, if 102 * followed by a legal input character, is too big. One that 103 * is equal to this value may be valid or not; the limit 104 * between valid and invalid numbers is then based on the last 105 * digit. For instance, if the range for quads is 106 * [-9223372036854775808..9223372036854775807] and the input base 107 * is 10, cutoff will be set to 922337203685477580 and cutlim to 108 * either 7 (neg==0) or 8 (neg==1), meaning that if we have 109 * accumulated a value > 922337203685477580, or equal but the 110 * next digit is > 7 (or 8), the number is too big, and we will 111 * return a range error. 112 * 113 * Set 'any' if any `digits' consumed; make it negative to indicate 114 * overflow. 115 */ 116 cutoff = neg ? (unsigned long long)-(LLONG_MIN + LLONG_MAX) + LLONG_MAX 117 : LLONG_MAX; 118 cutlim = cutoff % base; 119 cutoff /= base; 120 for ( ; ; c = *s++) { 121 if (c >= '0' && c <= '9') 122 c -= '0'; 123 else if (c >= 'A' && c <= 'Z') 124 c -= 'A' - 10; 125 else if (c >= 'a' && c <= 'z') 126 c -= 'a' - 10; 127 else 128 break; 129 if (c >= base) 130 break; 131 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 132 any = -1; 133 else { 134 any = 1; 135 acc *= base; 136 acc += c; 137 } 138 } 139 if (any < 0) { 140 acc = neg ? LLONG_MIN : LLONG_MAX; 141 errno = ERANGE; 142 } else if (!any) { 143 noconv: 144 errno = EINVAL; 145 } else if (neg) 146 acc = -acc; 147 if (endptr != NULL) 148 *endptr = (char *)(any ? s - 1 : nptr); 149 return (acc); 150 } 151 152