1 /* $NetBSD: strtoull.c,v 1.3 2023/06/19 21:41:45 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 #ifndef HAVE_STRTOULL 44 45 /* #include <sys/cdefs.h> */ 46 47 #include <limits.h> 48 #include <errno.h> 49 #include <ctype.h> 50 #include <stdlib.h> 51 #include <stdint.h> 52 53 /* 54 * Convert a string to an unsigned long long integer. 55 * 56 * Assumes that the upper and lower case 57 * alphabets and digits are each contiguous. 58 */ 59 ROKEN_LIB_FUNCTION unsigned long long ROKEN_LIB_CALL 60 strtoull(const char * nptr, char ** endptr, int base) 61 { 62 const char *s; 63 unsigned long long acc; 64 char c; 65 unsigned long long cutoff; 66 int neg, any, cutlim; 67 68 /* 69 * See strtoq for comments as to the logic used. 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 cutoff = ULLONG_MAX / base; 99 cutlim = ULLONG_MAX % base; 100 for ( ; ; c = *s++) { 101 if (c >= '0' && c <= '9') 102 c -= '0'; 103 else if (c >= 'A' && c <= 'Z') 104 c -= 'A' - 10; 105 else if (c >= 'a' && c <= 'z') 106 c -= 'a' - 10; 107 else 108 break; 109 if (c >= base) 110 break; 111 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 112 any = -1; 113 else { 114 any = 1; 115 acc *= base; 116 acc += c; 117 } 118 } 119 if (any < 0) { 120 acc = ULLONG_MAX; 121 errno = ERANGE; 122 } else if (!any) { 123 noconv: 124 errno = EINVAL; 125 } else if (neg) 126 acc = -acc; 127 if (endptr != NULL) 128 *endptr = (char *)(any ? s - 1 : nptr); 129 return (acc); 130 } 131 #endif /* !HAVE_STRTOULL */ 132