1 /*- 2 * Copyright (c) 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)strtouq.c 8.1 (Berkeley) 6/4/93 34 * $FreeBSD: src/lib/libc/stdlib/strtoull.c,v 1.5.2.1 2001/03/02 09:45:20 obrien Exp $ 35 * $DragonFly: src/lib/libc/stdlib/strtoull.c,v 1.3 2003/09/06 08:10:46 asmodai Exp $ 36 */ 37 38 #include <sys/types.h> 39 40 #include <limits.h> 41 #include <errno.h> 42 #include <ctype.h> 43 #include <stdlib.h> 44 45 /* 46 * Convert a string to an unsigned long long integer. 47 * 48 * Ignores `locale' stuff. Assumes that the upper and lower case 49 * alphabets and digits are each contiguous. 50 */ 51 unsigned long long 52 strtoull(nptr, endptr, base) 53 const char *nptr; 54 char **endptr; 55 int base; 56 { 57 const char *s = nptr; 58 unsigned long long acc; 59 unsigned char c; 60 unsigned long long qbase, cutoff; 61 int neg, any, cutlim; 62 63 /* 64 * See strtoq for comments as to the logic used. 65 */ 66 s = nptr; 67 do { 68 c = *s++; 69 } while (isspace(c)); 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 c = s[1]; 81 s += 2; 82 base = 16; 83 } 84 if (base == 0) 85 base = c == '0' ? 8 : 10; 86 qbase = (unsigned)base; 87 cutoff = (unsigned long long)ULLONG_MAX / qbase; 88 cutlim = (unsigned long long)ULLONG_MAX % qbase; 89 for (acc = 0, any = 0;; c = *s++) { 90 if (!isascii(c)) 91 break; 92 if (isdigit(c)) 93 c -= '0'; 94 else if (isalpha(c)) 95 c -= isupper(c) ? 'A' - 10 : 'a' - 10; 96 else 97 break; 98 if (c >= base) 99 break; 100 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 101 any = -1; 102 else { 103 any = 1; 104 acc *= qbase; 105 acc += c; 106 } 107 } 108 if (any < 0) { 109 acc = ULLONG_MAX; 110 errno = ERANGE; 111 } else if (neg) 112 acc = -acc; 113 if (endptr != 0) 114 *endptr = (char *)(any ? s - 1 : nptr); 115 return (acc); 116 } 117