1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Copyright (c) 2011 The FreeBSD Foundation 8 * 9 * Portions of this software were developed by David Chisnall 10 * under sponsorship from the FreeBSD Foundation. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #if defined(LIBC_SCCS) && !defined(lint) 38 static char sccsid[] = "@(#)strtol.c 8.1 (Berkeley) 6/4/93"; 39 #endif /* LIBC_SCCS and not lint */ 40 #include <sys/cdefs.h> 41 #include <limits.h> 42 #include <ctype.h> 43 #include <errno.h> 44 #include <stdlib.h> 45 #include "xlocale_private.h" 46 47 /* 48 * Convert a string to a long integer. 49 * 50 * Assumes that the upper and lower case 51 * alphabets and digits are each contiguous. 52 */ 53 long 54 strtol_l(const char * __restrict nptr, char ** __restrict endptr, int base, 55 locale_t locale) 56 { 57 const char *s; 58 unsigned long acc; 59 char c; 60 unsigned long cutoff; 61 int neg, any, cutlim; 62 FIX_LOCALE(locale); 63 64 /* 65 * Skip white space and pick up leading +/- sign if any. 66 * If base is 0, allow 0x for hex and 0 for octal, else 67 * assume decimal; if base is already 16, allow 0x. 68 */ 69 s = nptr; 70 do { 71 c = *s++; 72 } while (isspace_l((unsigned char)c, locale)); 73 if (c == '-') { 74 neg = 1; 75 c = *s++; 76 } else { 77 neg = 0; 78 if (c == '+') 79 c = *s++; 80 } 81 if ((base == 0 || base == 16) && 82 c == '0' && (*s == 'x' || *s == 'X') && 83 ((s[1] >= '0' && s[1] <= '9') || 84 (s[1] >= 'A' && s[1] <= 'F') || 85 (s[1] >= 'a' && s[1] <= 'f'))) { 86 c = s[1]; 87 s += 2; 88 base = 16; 89 } 90 if (base == 0) 91 base = c == '0' ? 8 : 10; 92 acc = any = 0; 93 if (base < 2 || base > 36) 94 goto noconv; 95 96 /* 97 * Compute the cutoff value between legal numbers and illegal 98 * numbers. That is the largest legal value, divided by the 99 * base. An input number that is greater than this value, if 100 * followed by a legal input character, is too big. One that 101 * is equal to this value may be valid or not; the limit 102 * between valid and invalid numbers is then based on the last 103 * digit. For instance, if the range for longs is 104 * [-2147483648..2147483647] and the input base is 10, 105 * cutoff will be set to 214748364 and cutlim to either 106 * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated 107 * a value > 214748364, or equal but the next digit is > 7 (or 8), 108 * the number is too big, and we will return a range error. 109 * 110 * Set 'any' if any `digits' consumed; make it negative to indicate 111 * overflow. 112 */ 113 cutoff = neg ? (unsigned long)-(LONG_MIN + LONG_MAX) + LONG_MAX 114 : LONG_MAX; 115 cutlim = cutoff % base; 116 cutoff /= base; 117 for ( ; ; c = *s++) { 118 if (c >= '0' && c <= '9') 119 c -= '0'; 120 else if (c >= 'A' && c <= 'Z') 121 c -= 'A' - 10; 122 else if (c >= 'a' && c <= 'z') 123 c -= 'a' - 10; 124 else 125 break; 126 if (c >= base) 127 break; 128 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 129 any = -1; 130 else { 131 any = 1; 132 acc *= base; 133 acc += c; 134 } 135 } 136 if (any < 0) { 137 acc = neg ? LONG_MIN : LONG_MAX; 138 errno = ERANGE; 139 } else if (!any) { 140 noconv: 141 errno = EINVAL; 142 } else if (neg) 143 acc = -acc; 144 if (endptr != NULL) 145 *endptr = (char *)(any ? s - 1 : nptr); 146 return (acc); 147 } 148 long 149 strtol(const char * __restrict nptr, char ** __restrict endptr, int base) 150 { 151 return strtol_l(nptr, endptr, base, __get_locale()); 152 } 153