strtoull.c revision 82975
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 34#if defined(LIBC_SCCS) && !defined(lint) 35static char sccsid[] = "@(#)strtouq.c 8.1 (Berkeley) 6/4/93"; 36#endif /* LIBC_SCCS and not lint */ 37 38#ifndef lint 39static const char rcsid[] = 40 "$FreeBSD: head/lib/libc/stdlib/strtoull.c 82975 2001-09-04 16:39:11Z ache $"; 41#endif 42 43#include <sys/types.h> 44 45#include <limits.h> 46#include <errno.h> 47#include <ctype.h> 48#include <stdlib.h> 49 50/* 51 * Convert a string to an unsigned long long integer. 52 * 53 * Assumes that the upper and lower case 54 * alphabets and digits are each contiguous. 55 */ 56unsigned long long 57strtoull(nptr, endptr, base) 58 const char *nptr; 59 char **endptr; 60 register int base; 61{ 62 register const char *s; 63 register unsigned long long acc; 64 register unsigned char c; 65 register unsigned long long cutoff; 66 register int neg, any, cutlim; 67 68 /* 69 * See strtoq for comments as to the logic used. 70 */ 71 s = nptr; 72 do { 73 c = *s++; 74 } while (isspace(c)); 75 if (c == '-') { 76 neg = 1; 77 c = *s++; 78 } else { 79 neg = 0; 80 if (c == '+') 81 c = *s++; 82 } 83 if ((base == 0 || base == 16) && 84 c == '0' && (*s == 'x' || *s == 'X')) { 85 c = s[1]; 86 s += 2; 87 base = 16; 88 } 89 if (base == 0) 90 base = c == '0' ? 8 : 10; 91 any = 0; 92 if (base < 2 || base > 36) 93 goto noconv; 94 95 cutoff = ULLONG_MAX / base; 96 cutlim = ULLONG_MAX % base; 97 for (acc = 0; ; c = *s++) { 98 if (!isascii(c)) 99 break; 100 if (isdigit(c)) 101 c -= '0'; 102 else if (isalpha(c)) 103 c -= isupper(c) ? 'A' - 10 : 'a' - 10; 104 else 105 break; 106 if (c >= base) 107 break; 108 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 109 any = -1; 110 else { 111 any = 1; 112 acc *= base; 113 acc += c; 114 } 115 } 116 if (any < 0) { 117 acc = ULLONG_MAX; 118 errno = ERANGE; 119 } else if (!any) { 120noconv: 121 errno = EINVAL; 122 } else if (neg) 123 acc = -acc; 124 if (endptr != NULL) 125 *endptr = (char *)(any ? s - 1 : nptr); 126 return (acc); 127} 128