1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 * 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 * 3. 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 <limits.h> 38 #include <errno.h> 39 #include <ctype.h> 40 #include <stdlib.h> 41 #include "xlocale_private.h" 42 43 /* 44 * Convert a string to a long long integer. 45 * 46 * Assumes that the upper and lower case 47 * alphabets and digits are each contiguous. 48 */ 49 long long 50 strtoll_l(const char * __restrict nptr, char ** __restrict endptr, int base, 51 locale_t locale) 52 { 53 const char *s; 54 unsigned long long acc; 55 char c; 56 unsigned long long cutoff; 57 int neg, any, cutlim; 58 FIX_LOCALE(locale); 59 60 /* 61 * Skip white space and pick up leading +/- sign if any. 62 * If base is 0, allow 0b for binary, 0x for hex, and 0 for 63 * octal, else assume decimal; if base is already 2, allow 64 * 0b; if base is already 16, allow 0x. 65 */ 66 s = nptr; 67 do { 68 c = *s++; 69 } while (isspace_l((unsigned char)c, locale)); 70 if (c == '-') { 71 neg = 1; 72 c = *s++; 73 } else { 74 neg = 0; 75 if (c == '+') 76 c = *s++; 77 } 78 if ((base == 0 || base == 16) && 79 c == '0' && (*s == 'x' || *s == 'X') && 80 ((s[1] >= '0' && s[1] <= '9') || 81 (s[1] >= 'A' && s[1] <= 'F') || 82 (s[1] >= 'a' && s[1] <= 'f'))) { 83 c = s[1]; 84 s += 2; 85 base = 16; 86 } 87 if ((base == 0 || base == 2) && 88 c == '0' && (*s == 'b' || *s == 'B') && 89 (s[1] >= '0' && s[1] <= '1')) { 90 c = s[1]; 91 s += 2; 92 base = 2; 93 } 94 if (base == 0) 95 base = c == '0' ? 8 : 10; 96 acc = any = 0; 97 if (base < 2 || base > 36) 98 goto noconv; 99 100 /* 101 * Compute the cutoff value between legal numbers and illegal 102 * numbers. That is the largest legal value, divided by the 103 * base. An input number that is greater than this value, if 104 * followed by a legal input character, is too big. One that 105 * is equal to this value may be valid or not; the limit 106 * between valid and invalid numbers is then based on the last 107 * digit. For instance, if the range for quads is 108 * [-9223372036854775808..9223372036854775807] and the input base 109 * is 10, cutoff will be set to 922337203685477580 and cutlim to 110 * either 7 (neg==0) or 8 (neg==1), meaning that if we have 111 * accumulated a value > 922337203685477580, or equal but the 112 * next digit is > 7 (or 8), the number is too big, and we will 113 * return a range error. 114 * 115 * Set 'any' if any `digits' consumed; make it negative to indicate 116 * overflow. 117 */ 118 cutoff = neg ? (unsigned long long)-(LLONG_MIN + LLONG_MAX) + LLONG_MAX 119 : LLONG_MAX; 120 cutlim = cutoff % base; 121 cutoff /= base; 122 for ( ; ; c = *s++) { 123 if (c >= '0' && c <= '9') 124 c -= '0'; 125 else if (c >= 'A' && c <= 'Z') 126 c -= 'A' - 10; 127 else if (c >= 'a' && c <= 'z') 128 c -= 'a' - 10; 129 else 130 break; 131 if (c >= base) 132 break; 133 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 134 any = -1; 135 else { 136 any = 1; 137 acc *= base; 138 acc += c; 139 } 140 } 141 if (any < 0) { 142 acc = neg ? LLONG_MIN : LLONG_MAX; 143 errno = ERANGE; 144 } else if (!any) { 145 noconv: 146 errno = EINVAL; 147 } else if (neg) 148 acc = -acc; 149 if (endptr != NULL) 150 *endptr = (char *)(any ? s - 1 : nptr); 151 return (acc); 152 } 153 long long 154 strtoll(const char * __restrict nptr, char ** __restrict endptr, int base) 155 { 156 return strtoll_l(nptr, endptr, base, __get_locale()); 157 } 158