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 /* OPENBSD ORIGINAL: lib/libc/stdlib/strtoull.c */ 32 33 #include "includes.h" 34 #ifndef HAVE_STRTOULL 35 36 #include <sys/types.h> 37 38 #include <ctype.h> 39 #include <errno.h> 40 #include <limits.h> 41 #include <stdlib.h> 42 43 /* 44 * Convert a string to an unsigned long long. 45 * 46 * Ignores `locale' stuff. Assumes that the upper and lower case 47 * alphabets and digits are each contiguous. 48 */ 49 unsigned long long 50 strtoull(const char *nptr, char **endptr, int base) 51 { 52 const char *s; 53 unsigned long long acc, cutoff; 54 int c; 55 int neg, any, cutlim; 56 57 /* 58 * See strtoq for comments as to the logic used. 59 */ 60 s = nptr; 61 do { 62 c = (unsigned char) *s++; 63 } while (isspace(c)); 64 if (c == '-') { 65 neg = 1; 66 c = *s++; 67 } else { 68 neg = 0; 69 if (c == '+') 70 c = *s++; 71 } 72 if ((base == 0 || base == 16) && 73 c == '0' && (*s == 'x' || *s == 'X')) { 74 c = s[1]; 75 s += 2; 76 base = 16; 77 } 78 if (base == 0) 79 base = c == '0' ? 8 : 10; 80 81 cutoff = ULLONG_MAX / (unsigned long long)base; 82 cutlim = ULLONG_MAX % (unsigned long long)base; 83 for (acc = 0, any = 0;; c = (unsigned char) *s++) { 84 if (isdigit(c)) 85 c -= '0'; 86 else if (isalpha(c)) 87 c -= isupper(c) ? 'A' - 10 : 'a' - 10; 88 else 89 break; 90 if (c >= base) 91 break; 92 if (any < 0) 93 continue; 94 if (acc > cutoff || (acc == cutoff && c > cutlim)) { 95 any = -1; 96 acc = ULLONG_MAX; 97 errno = ERANGE; 98 } else { 99 any = 1; 100 acc *= (unsigned long long)base; 101 acc += c; 102 } 103 } 104 if (neg && any > 0) 105 acc = -acc; 106 if (endptr != 0) 107 *endptr = (char *) (any ? s - 1 : nptr); 108 return (acc); 109 } 110 #endif /* !HAVE_STRTOULL */ 111