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 an unsigned long long integer. 45 * 46 * Assumes that the upper and lower case 47 * alphabets and digits are each contiguous. 48 */ 49 unsigned long long 50 strtoull_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 * See strtoq for comments as to the logic used. 62 */ 63 s = nptr; 64 do { 65 c = *s++; 66 } while (isspace_l((unsigned char)c, locale)); 67 if (c == '-') { 68 neg = 1; 69 c = *s++; 70 } else { 71 neg = 0; 72 if (c == '+') 73 c = *s++; 74 } 75 if ((base == 0 || base == 16) && 76 c == '0' && (*s == 'x' || *s == 'X') && 77 ((s[1] >= '0' && s[1] <= '9') || 78 (s[1] >= 'A' && s[1] <= 'F') || 79 (s[1] >= 'a' && s[1] <= 'f'))) { 80 c = s[1]; 81 s += 2; 82 base = 16; 83 } 84 if ((base == 0 || base == 2) && 85 c == '0' && (*s == 'b' || *s == 'B') && 86 (s[1] >= '0' && s[1] <= '1')) { 87 c = s[1]; 88 s += 2; 89 base = 2; 90 } 91 if (base == 0) 92 base = c == '0' ? 8 : 10; 93 acc = any = 0; 94 if (base < 2 || base > 36) 95 goto noconv; 96 97 cutoff = ULLONG_MAX / base; 98 cutlim = ULLONG_MAX % base; 99 for ( ; ; c = *s++) { 100 if (c >= '0' && c <= '9') 101 c -= '0'; 102 else if (c >= 'A' && c <= 'Z') 103 c -= 'A' - 10; 104 else if (c >= 'a' && c <= 'z') 105 c -= 'a' - 10; 106 else 107 break; 108 if (c >= base) 109 break; 110 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 111 any = -1; 112 else { 113 any = 1; 114 acc *= base; 115 acc += c; 116 } 117 } 118 if (any < 0) { 119 acc = ULLONG_MAX; 120 errno = ERANGE; 121 } else if (!any) { 122 noconv: 123 errno = EINVAL; 124 } else if (neg) 125 acc = -acc; 126 if (endptr != NULL) 127 *endptr = (char *)(any ? s - 1 : nptr); 128 return (acc); 129 } 130 unsigned long long 131 strtoull(const char * __restrict nptr, char ** __restrict endptr, int base) 132 { 133 return strtoull_l(nptr, endptr, base, __get_locale()); 134 } 135