1 /* $OpenBSD: strtoull.c,v 1.5 2005/08/08 08:05:37 espie Exp $ */ 2 /*- 3 * Copyright (c) 1992 The Regents of the University of California. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/types.h> 32 33 #include <ctype.h> 34 #include <errno.h> 35 #include <limits.h> 36 #include <stdlib.h> 37 38 /* 39 * Convert a string to an unsigned long long. 40 * 41 * Ignores `locale' stuff. Assumes that the upper and lower case 42 * alphabets and digits are each contiguous. 43 */ 44 unsigned long long 45 strtoull(const char *nptr, char **endptr, int base) 46 { 47 const char *s; 48 unsigned long long acc, cutoff; 49 int c; 50 int neg, any, cutlim; 51 52 /* 53 * See strtoq for comments as to the logic used. 54 */ 55 s = nptr; 56 do { 57 c = (unsigned char) *s++; 58 } while (isspace(c)); 59 if (c == '-') { 60 neg = 1; 61 c = *s++; 62 } else { 63 neg = 0; 64 if (c == '+') 65 c = *s++; 66 } 67 if ((base == 0 || base == 16) && 68 c == '0' && (*s == 'x' || *s == 'X')) { 69 c = s[1]; 70 s += 2; 71 base = 16; 72 } 73 if (base == 0) 74 base = c == '0' ? 8 : 10; 75 76 cutoff = ULLONG_MAX / (unsigned long long)base; 77 cutlim = ULLONG_MAX % (unsigned long long)base; 78 for (acc = 0, any = 0;; c = (unsigned char) *s++) { 79 if (isdigit(c)) 80 c -= '0'; 81 else if (isalpha(c)) 82 c -= isupper(c) ? 'A' - 10 : 'a' - 10; 83 else 84 break; 85 if (c >= base) 86 break; 87 if (any < 0) 88 continue; 89 if (acc > cutoff || (acc == cutoff && c > cutlim)) { 90 any = -1; 91 acc = ULLONG_MAX; 92 errno = ERANGE; 93 } else { 94 any = 1; 95 acc *= (unsigned long long)base; 96 acc += c; 97 } 98 } 99 if (neg && any > 0) 100 acc = -acc; 101 if (endptr != 0) 102 *endptr = (char *) (any ? s - 1 : nptr); 103 return (acc); 104 } 105 106 #ifdef __weak_alias 107 __weak_alias(strtouq, strtoull); 108 #else 109 u_quad_t 110 strtouq(const char *nptr, char **endptr, int base) 111 { 112 113 return ((u_quad_t)strtoull(nptr, endptr, base)); 114 } 115 #endif 116