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[] = "@(#)strtoul.c 8.1 (Berkeley) 6/4/93"; 39 #endif /* LIBC_SCCS and not lint */ 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 #include <limits.h> 44 #include <ctype.h> 45 #include <errno.h> 46 #include <stdlib.h> 47 #include "xlocale_private.h" 48 49 /* 50 * Convert a string to an unsigned long integer. 51 * 52 * Assumes that the upper and lower case 53 * alphabets and digits are each contiguous. 54 */ 55 unsigned long 56 strtoul_l(const char * __restrict nptr, char ** __restrict endptr, int base, locale_t locale) 57 { 58 const char *s; 59 unsigned long acc; 60 char c; 61 unsigned long cutoff; 62 int neg, any, cutlim; 63 FIX_LOCALE(locale); 64 65 /* 66 * See strtol for comments as to the logic used. 67 */ 68 s = nptr; 69 do { 70 c = *s++; 71 } while (isspace_l((unsigned char)c, locale)); 72 if (c == '-') { 73 neg = 1; 74 c = *s++; 75 } else { 76 neg = 0; 77 if (c == '+') 78 c = *s++; 79 } 80 if ((base == 0 || base == 16) && 81 c == '0' && (*s == 'x' || *s == 'X') && 82 ((s[1] >= '0' && s[1] <= '9') || 83 (s[1] >= 'A' && s[1] <= 'F') || 84 (s[1] >= 'a' && s[1] <= 'f'))) { 85 c = s[1]; 86 s += 2; 87 base = 16; 88 } 89 if (base == 0) 90 base = c == '0' ? 8 : 10; 91 acc = any = 0; 92 if (base < 2 || base > 36) 93 goto noconv; 94 95 cutoff = ULONG_MAX / base; 96 cutlim = ULONG_MAX % base; 97 for ( ; ; c = *s++) { 98 if (c >= '0' && c <= '9') 99 c -= '0'; 100 else if (c >= 'A' && c <= 'Z') 101 c -= 'A' - 10; 102 else if (c >= 'a' && c <= 'z') 103 c -= '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 = ULONG_MAX; 118 errno = ERANGE; 119 } else if (!any) { 120 noconv: 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 unsigned long 129 strtoul(const char * __restrict nptr, char ** __restrict endptr, int base) 130 { 131 return strtoul_l(nptr, endptr, base, __get_locale()); 132 } 133