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. 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 34 #if defined(LIBC_SCCS) && !defined(lint) 35 static const char rcsid[] = "$OpenBSD: strtoull.c,v 1.1 2002/06/29 00:20:11 millert Exp $"; 36 #endif /* LIBC_SCCS and not lint */ 37 38 #include <sys/types.h> 39 40 #include <ctype.h> 41 #include <errno.h> 42 #include <limits.h> 43 #include <stdlib.h> 44 45 /* 46 * Convert a string to an unsigned long long. 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; 58 unsigned long long acc, cutoff; 59 int c; 60 int neg, any, cutlim; 61 62 /* 63 * See strtoq for comments as to the logic used. 64 */ 65 s = nptr; 66 do { 67 c = (unsigned char) *s++; 68 } while (isspace(c)); 69 if (c == '-') { 70 neg = 1; 71 c = *s++; 72 } else { 73 neg = 0; 74 if (c == '+') 75 c = *s++; 76 } 77 if ((base == 0 || base == 16) && 78 c == '0' && (*s == 'x' || *s == 'X')) { 79 c = s[1]; 80 s += 2; 81 base = 16; 82 } 83 if (base == 0) 84 base = c == '0' ? 8 : 10; 85 86 cutoff = ULLONG_MAX / (unsigned long long)base; 87 cutlim = ULLONG_MAX % (unsigned long long)base; 88 for (acc = 0, any = 0;; c = (unsigned char) *s++) { 89 if (isdigit(c)) 90 c -= '0'; 91 else if (isalpha(c)) 92 c -= isupper(c) ? 'A' - 10 : 'a' - 10; 93 else 94 break; 95 if (c >= base) 96 break; 97 if (any < 0) 98 continue; 99 if (acc > cutoff || (acc == cutoff && c > cutlim)) { 100 any = -1; 101 acc = ULLONG_MAX; 102 errno = ERANGE; 103 } else { 104 any = 1; 105 acc *= (unsigned long long)base; 106 acc += c; 107 } 108 } 109 if (neg && any > 0) 110 acc = -acc; 111 if (endptr != 0) 112 *endptr = (char *) (any ? s - 1 : nptr); 113 return (acc); 114 } 115 116 #ifdef __weak_alias 117 __weak_alias(strtouq, strtoull); 118 #else 119 u_quad_t 120 strtouq(nptr, endptr, base) 121 const char *nptr; 122 char **endptr; 123 int base; 124 { 125 126 return ((u_quad_t)strtoull(nptr, endptr, base); 127 } 128 #endif 129