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: strtoll.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 a long long. 43 * 44 * Ignores `locale' stuff. Assumes that the upper and lower case 45 * alphabets and digits are each contiguous. 46 */ 47 long long 48 strtoll(nptr, endptr, base) 49 const char *nptr; 50 char **endptr; 51 int base; 52 { 53 const char *s; 54 long long acc, cutoff; 55 int c; 56 int neg, any, cutlim; 57 58 /* 59 * Skip white space and pick up leading +/- sign if any. 60 * If base is 0, allow 0x for hex and 0 for octal, else 61 * assume decimal; if base is already 16, allow 0x. 62 */ 63 s = nptr; 64 do { 65 c = (unsigned char) *s++; 66 } while (isspace(c)); 67 if (c == '-') { 68 neg = 1; 69 c = *s++; 70 } else { 71 neg = 0; 72 if (c == '+') 73 c = *s++; 74 } 75 if ((base == 0 || base == 16) && 76 c == '0' && (*s == 'x' || *s == 'X')) { 77 c = s[1]; 78 s += 2; 79 base = 16; 80 } 81 if (base == 0) 82 base = c == '0' ? 8 : 10; 83 84 /* 85 * Compute the cutoff value between legal numbers and illegal 86 * numbers. That is the largest legal value, divided by the 87 * base. An input number that is greater than this value, if 88 * followed by a legal input character, is too big. One that 89 * is equal to this value may be valid or not; the limit 90 * between valid and invalid numbers is then based on the last 91 * digit. For instance, if the range for long longs is 92 * [-9223372036854775808..9223372036854775807] and the input base 93 * is 10, cutoff will be set to 922337203685477580 and cutlim to 94 * either 7 (neg==0) or 8 (neg==1), meaning that if we have 95 * accumulated a value > 922337203685477580, or equal but the 96 * next digit is > 7 (or 8), the number is too big, and we will 97 * return a range error. 98 * 99 * Set any if any `digits' consumed; make it negative to indicate 100 * overflow. 101 */ 102 cutoff = neg ? LLONG_MIN : LLONG_MAX; 103 cutlim = cutoff % base; 104 cutoff /= base; 105 if (neg) { 106 if (cutlim > 0) { 107 cutlim -= base; 108 cutoff += 1; 109 } 110 cutlim = -cutlim; 111 } 112 for (acc = 0, any = 0;; c = (unsigned char) *s++) { 113 if (isdigit(c)) 114 c -= '0'; 115 else if (isalpha(c)) 116 c -= isupper(c) ? 'A' - 10 : 'a' - 10; 117 else 118 break; 119 if (c >= base) 120 break; 121 if (any < 0) 122 continue; 123 if (neg) { 124 if (acc < cutoff || (acc == cutoff && c > cutlim)) { 125 any = -1; 126 acc = LLONG_MIN; 127 errno = ERANGE; 128 } else { 129 any = 1; 130 acc *= base; 131 acc -= c; 132 } 133 } else { 134 if (acc > cutoff || (acc == cutoff && c > cutlim)) { 135 any = -1; 136 acc = LLONG_MAX; 137 errno = ERANGE; 138 } else { 139 any = 1; 140 acc *= base; 141 acc += c; 142 } 143 } 144 } 145 if (endptr != 0) 146 *endptr = (char *) (any ? s - 1 : nptr); 147 return (acc); 148 } 149 150 #ifdef __weak_alias 151 __weak_alias(strtoq, strtoll); 152 #else 153 quad_t 154 strtoq(nptr, endptr, base) 155 const char *nptr; 156 char **endptr; 157 int base; 158 { 159 160 return ((quad_t)strtoll(nptr, endptr, base); 161 } 162 #endif 163