1*d56b957cSMadhukar Pappireddy /*- 2*d56b957cSMadhukar Pappireddy * SPDX-License-Identifier: BSD-3-Clause 3*d56b957cSMadhukar Pappireddy * 4*d56b957cSMadhukar Pappireddy * Copyright (c) 1992, 1993 5*d56b957cSMadhukar Pappireddy * The Regents of the University of California. All rights reserved. 6*d56b957cSMadhukar Pappireddy * 7*d56b957cSMadhukar Pappireddy * Copyright (c) 2011 The FreeBSD Foundation 8*d56b957cSMadhukar Pappireddy * All rights reserved. 9*d56b957cSMadhukar Pappireddy * Portions of this software were developed by David Chisnall 10*d56b957cSMadhukar Pappireddy * under sponsorship from the FreeBSD Foundation. 11*d56b957cSMadhukar Pappireddy * 12*d56b957cSMadhukar Pappireddy * Redistribution and use in source and binary forms, with or without 13*d56b957cSMadhukar Pappireddy * modification, are permitted provided that the following conditions 14*d56b957cSMadhukar Pappireddy * are met: 15*d56b957cSMadhukar Pappireddy * 1. Redistributions of source code must retain the above copyright 16*d56b957cSMadhukar Pappireddy * notice, this list of conditions and the following disclaimer. 17*d56b957cSMadhukar Pappireddy * 2. Redistributions in binary form must reproduce the above copyright 18*d56b957cSMadhukar Pappireddy * notice, this list of conditions and the following disclaimer in the 19*d56b957cSMadhukar Pappireddy * documentation and/or other materials provided with the distribution. 20*d56b957cSMadhukar Pappireddy * 3. Neither the name of the University nor the names of its contributors 21*d56b957cSMadhukar Pappireddy * may be used to endorse or promote products derived from this software 22*d56b957cSMadhukar Pappireddy * without specific prior written permission. 23*d56b957cSMadhukar Pappireddy * 24*d56b957cSMadhukar Pappireddy * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25*d56b957cSMadhukar Pappireddy * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26*d56b957cSMadhukar Pappireddy * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27*d56b957cSMadhukar Pappireddy * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28*d56b957cSMadhukar Pappireddy * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29*d56b957cSMadhukar Pappireddy * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30*d56b957cSMadhukar Pappireddy * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31*d56b957cSMadhukar Pappireddy * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32*d56b957cSMadhukar Pappireddy * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33*d56b957cSMadhukar Pappireddy * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34*d56b957cSMadhukar Pappireddy * SUCH DAMAGE. 35*d56b957cSMadhukar Pappireddy */ 36*d56b957cSMadhukar Pappireddy 37*d56b957cSMadhukar Pappireddy #include <errno.h> 38*d56b957cSMadhukar Pappireddy #include <limits.h> 39*d56b957cSMadhukar Pappireddy #include <stddef.h> 40*d56b957cSMadhukar Pappireddy #include <stdlib.h> 41*d56b957cSMadhukar Pappireddy 42*d56b957cSMadhukar Pappireddy /* 43*d56b957cSMadhukar Pappireddy * Convert a string to an unsigned long long integer. 44*d56b957cSMadhukar Pappireddy * 45*d56b957cSMadhukar Pappireddy * Assumes that the upper and lower case 46*d56b957cSMadhukar Pappireddy * alphabets and digits are each contiguous. 47*d56b957cSMadhukar Pappireddy */ 48*d56b957cSMadhukar Pappireddy unsigned long long strtoull(const char *nptr, char **endptr, int base) 49*d56b957cSMadhukar Pappireddy { 50*d56b957cSMadhukar Pappireddy const char *s; 51*d56b957cSMadhukar Pappireddy unsigned long long acc; 52*d56b957cSMadhukar Pappireddy char c; 53*d56b957cSMadhukar Pappireddy unsigned long long cutoff; 54*d56b957cSMadhukar Pappireddy int neg, any, cutlim; 55*d56b957cSMadhukar Pappireddy 56*d56b957cSMadhukar Pappireddy /* 57*d56b957cSMadhukar Pappireddy * See strtoq for comments as to the logic used. 58*d56b957cSMadhukar Pappireddy */ 59*d56b957cSMadhukar Pappireddy s = nptr; 60*d56b957cSMadhukar Pappireddy do { 61*d56b957cSMadhukar Pappireddy c = *s++; 62*d56b957cSMadhukar Pappireddy } while (isspace((unsigned char)c)); 63*d56b957cSMadhukar Pappireddy if (c == '-') { 64*d56b957cSMadhukar Pappireddy neg = 1; 65*d56b957cSMadhukar Pappireddy c = *s++; 66*d56b957cSMadhukar Pappireddy } else { 67*d56b957cSMadhukar Pappireddy neg = 0; 68*d56b957cSMadhukar Pappireddy if (c == '+') 69*d56b957cSMadhukar Pappireddy c = *s++; 70*d56b957cSMadhukar Pappireddy } 71*d56b957cSMadhukar Pappireddy if ((base == 0 || base == 16) && 72*d56b957cSMadhukar Pappireddy c == '0' && (*s == 'x' || *s == 'X') && 73*d56b957cSMadhukar Pappireddy ((s[1] >= '0' && s[1] <= '9') || 74*d56b957cSMadhukar Pappireddy (s[1] >= 'A' && s[1] <= 'F') || 75*d56b957cSMadhukar Pappireddy (s[1] >= 'a' && s[1] <= 'f'))) { 76*d56b957cSMadhukar Pappireddy c = s[1]; 77*d56b957cSMadhukar Pappireddy s += 2; 78*d56b957cSMadhukar Pappireddy base = 16; 79*d56b957cSMadhukar Pappireddy } 80*d56b957cSMadhukar Pappireddy if (base == 0) 81*d56b957cSMadhukar Pappireddy base = c == '0' ? 8 : 10; 82*d56b957cSMadhukar Pappireddy acc = any = 0; 83*d56b957cSMadhukar Pappireddy 84*d56b957cSMadhukar Pappireddy cutoff = ULLONG_MAX / base; 85*d56b957cSMadhukar Pappireddy cutlim = ULLONG_MAX % base; 86*d56b957cSMadhukar Pappireddy for ( ; ; c = *s++) { 87*d56b957cSMadhukar Pappireddy if (c >= '0' && c <= '9') 88*d56b957cSMadhukar Pappireddy c -= '0'; 89*d56b957cSMadhukar Pappireddy else if (c >= 'A' && c <= 'Z') 90*d56b957cSMadhukar Pappireddy c -= 'A' - 10; 91*d56b957cSMadhukar Pappireddy else if (c >= 'a' && c <= 'z') 92*d56b957cSMadhukar Pappireddy c -= 'a' - 10; 93*d56b957cSMadhukar Pappireddy else 94*d56b957cSMadhukar Pappireddy break; 95*d56b957cSMadhukar Pappireddy if (c >= base) 96*d56b957cSMadhukar Pappireddy break; 97*d56b957cSMadhukar Pappireddy if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 98*d56b957cSMadhukar Pappireddy any = -1; 99*d56b957cSMadhukar Pappireddy else { 100*d56b957cSMadhukar Pappireddy any = 1; 101*d56b957cSMadhukar Pappireddy acc *= base; 102*d56b957cSMadhukar Pappireddy acc += c; 103*d56b957cSMadhukar Pappireddy } 104*d56b957cSMadhukar Pappireddy } 105*d56b957cSMadhukar Pappireddy if (any < 0) { 106*d56b957cSMadhukar Pappireddy acc = ULLONG_MAX; 107*d56b957cSMadhukar Pappireddy } else if (neg) 108*d56b957cSMadhukar Pappireddy acc = -acc; 109*d56b957cSMadhukar Pappireddy if (endptr != NULL) 110*d56b957cSMadhukar Pappireddy *endptr = (char *)(any ? s - 1 : nptr); 111*d56b957cSMadhukar Pappireddy return (acc); 112*d56b957cSMadhukar Pappireddy } 113