1 /*- 2 * Copyright (c) 1992 The Regents of the University of California. 3 * 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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #if defined(LIBC_SCCS) && !defined(lint) 31 static const char rcsid[] = "$OpenBSD: strtoull.c,v 1.2 2003/06/02 20:18:38 millert Exp $"; 32 #endif /* LIBC_SCCS and not lint */ 33 34 #include <sys/types.h> 35 36 #include <ctype.h> 37 #include <errno.h> 38 #include <limits.h> 39 #include <stdlib.h> 40 41 /* 42 * Convert a string to an unsigned long long. 43 * 44 * Ignores `locale' stuff. Assumes that the upper and lower case 45 * alphabets and digits are each contiguous. 46 */ 47 unsigned long long 48 strtoull(nptr, endptr, base) 49 const char *nptr; 50 char **endptr; 51 int base; 52 { 53 const char *s; 54 unsigned long long acc, cutoff; 55 int c; 56 int neg, any, cutlim; 57 58 /* 59 * See strtoq for comments as to the logic used. 60 */ 61 s = nptr; 62 do { 63 c = (unsigned char) *s++; 64 } while (isspace(c)); 65 if (c == '-') { 66 neg = 1; 67 c = *s++; 68 } else { 69 neg = 0; 70 if (c == '+') 71 c = *s++; 72 } 73 if ((base == 0 || base == 16) && 74 c == '0' && (*s == 'x' || *s == 'X')) { 75 c = s[1]; 76 s += 2; 77 base = 16; 78 } 79 if (base == 0) 80 base = c == '0' ? 8 : 10; 81 82 cutoff = ULLONG_MAX / (unsigned long long)base; 83 cutlim = ULLONG_MAX % (unsigned long long)base; 84 for (acc = 0, any = 0;; c = (unsigned char) *s++) { 85 if (isdigit(c)) 86 c -= '0'; 87 else if (isalpha(c)) 88 c -= isupper(c) ? 'A' - 10 : 'a' - 10; 89 else 90 break; 91 if (c >= base) 92 break; 93 if (any < 0) 94 continue; 95 if (acc > cutoff || (acc == cutoff && c > cutlim)) { 96 any = -1; 97 acc = ULLONG_MAX; 98 errno = ERANGE; 99 } else { 100 any = 1; 101 acc *= (unsigned long long)base; 102 acc += c; 103 } 104 } 105 if (neg && any > 0) 106 acc = -acc; 107 if (endptr != 0) 108 *endptr = (char *) (any ? s - 1 : nptr); 109 return (acc); 110 } 111 112 #ifdef __weak_alias 113 __weak_alias(strtouq, strtoull); 114 #else 115 u_quad_t 116 strtouq(nptr, endptr, base) 117 const char *nptr; 118 char **endptr; 119 int base; 120 { 121 122 return ((u_quad_t)strtoull(nptr, endptr, base); 123 } 124 #endif 125