1 /* $NetBSD: strtoll.c,v 1.2 2006/12/18 00:41:54 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #if HAVE_NBTOOL_CONFIG_H 33 #include "nbtool_config.h" 34 #endif 35 36 #if !defined(_KERNEL) && !defined(_STANDALONE) 37 #include <sys/cdefs.h> 38 #if defined(LIBC_SCCS) && !defined(lint) 39 #if 0 40 static char sccsid[] = "from: @(#)strtoq.c 8.1 (Berkeley) 6/4/93"; 41 #else 42 __RCSID("$NetBSD: strtoll.c,v 1.2 2006/12/18 00:41:54 christos Exp $"); 43 #endif 44 #endif /* LIBC_SCCS and not lint */ 45 46 #ifdef _LIBC 47 #include "namespace.h" 48 #endif 49 50 #include <assert.h> 51 #include <ctype.h> 52 #include <errno.h> 53 #include <limits.h> 54 #include <stdlib.h> 55 56 #ifdef _LIBC 57 #ifdef __weak_alias 58 __weak_alias(strtoll, _strtoll) 59 #endif 60 #endif 61 62 #else /* !_KERNEL && !_STANDALONE */ 63 #include <sys/param.h> 64 #include <lib/libkern/libkern.h> 65 #define isspace(x) ((x) == ' ' || (x) == '\t' || (x) == '\n' || (x) == '\r') 66 #define isdigit(x) ((x) >= '0' && (x) <= '9') 67 #define isalpha(x) (((x) >= 'a' && (x) <= 'z') || ((x) >= 'A' && (x) <= 'Z')) 68 #define toupper(x) ((x) & ~0x20) 69 #endif 70 71 #if !HAVE_STRTOLL 72 /* 73 * Convert a string to a long long integer. 74 * 75 * Ignores `locale' stuff. Assumes that the upper and lower case 76 * alphabets and digits are each contiguous. 77 */ 78 /* LONGLONG */ 79 long long int 80 #ifdef _LIBC 81 _strtoll(nptr, endptr, base) 82 #else 83 strtoll(nptr, endptr, base) 84 #endif 85 const char *nptr; 86 char **endptr; 87 int base; 88 { 89 const char *s; 90 /* LONGLONG */ 91 long long int acc, cutoff; 92 int c; 93 int neg, any, cutlim; 94 95 _DIAGASSERT(nptr != NULL); 96 /* endptr may be NULL */ 97 98 /* 99 * Skip white space and pick up leading +/- sign if any. 100 * If base is 0, allow 0x for hex and 0 for octal, else 101 * assume decimal; if base is already 16, allow 0x. 102 */ 103 s = nptr; 104 do { 105 c = (unsigned char) *s++; 106 } while (isspace(c)); 107 if (c == '-') { 108 neg = 1; 109 c = *s++; 110 } else { 111 neg = 0; 112 if (c == '+') 113 c = *s++; 114 } 115 if ((base == 0 || base == 16) && 116 c == '0' && (*s == 'x' || *s == 'X')) { 117 c = s[1]; 118 s += 2; 119 base = 16; 120 } 121 if (base == 0) 122 base = c == '0' ? 8 : 10; 123 124 /* 125 * Compute the cutoff value between legal numbers and illegal 126 * numbers. That is the largest legal value, divided by the 127 * base. An input number that is greater than this value, if 128 * followed by a legal input character, is too big. One that 129 * is equal to this value may be valid or not; the limit 130 * between valid and invalid numbers is then based on the last 131 * digit. For instance, if the range for long longs is 132 * [-9223372036854775808..9223372036854775807] and the input base 133 * is 10, cutoff will be set to 922337203685477580 and cutlim to 134 * either 7 (neg==0) or 8 (neg==1), meaning that if we have 135 * accumulated a value > 922337203685477580, or equal but the 136 * next digit is > 7 (or 8), the number is too big, and we will 137 * return a range error. 138 * 139 * Set any if any `digits' consumed; make it negative to indicate 140 * overflow. 141 */ 142 cutoff = neg ? LLONG_MIN : LLONG_MAX; 143 cutlim = (int)(cutoff % base); 144 cutoff /= base; 145 if (neg) { 146 if (cutlim > 0) { 147 cutlim -= base; 148 cutoff += 1; 149 } 150 cutlim = -cutlim; 151 } 152 for (acc = 0, any = 0;; c = (unsigned char) *s++) { 153 if (isdigit(c)) 154 c -= '0'; 155 else if (isalpha(c)) { 156 #if defined(_KERNEL) || defined(_STANDALONE) 157 c = toupper(c) - 'A' + 10; 158 #else 159 c -= isupper(c) ? 'A' - 10 : 'a' - 10; 160 #endif 161 } else 162 break; 163 if (c >= base) 164 break; 165 if (any < 0) 166 continue; 167 if (neg) { 168 if (acc < cutoff || (acc == cutoff && c > cutlim)) { 169 #if defined(_KERNEL) || defined(_STANDALONE) 170 if (endptr) 171 *endptr = __UNCONST(nptr); 172 return (LLONG_MIN); 173 #else 174 any = -1; 175 acc = LLONG_MIN; 176 errno = ERANGE; 177 #endif 178 } else { 179 any = 1; 180 acc *= base; 181 acc -= c; 182 } 183 } else { 184 if (acc > cutoff || (acc == cutoff && c > cutlim)) { 185 #if defined(_KERNEL) || defined(_STANDALONE) 186 if (endptr) 187 *endptr = __UNCONST(nptr); 188 return (LLONG_MAX); 189 #else 190 any = -1; 191 acc = LLONG_MAX; 192 errno = ERANGE; 193 #endif 194 } else { 195 any = 1; 196 acc *= base; 197 acc += c; 198 } 199 } 200 } 201 if (endptr != 0) 202 *endptr = __UNCONST(any ? s - 1 : nptr); 203 return (acc); 204 } 205 #endif 206