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 #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 an unsigned long integer. 49 * 50 * Assumes that the upper and lower case 51 * alphabets and digits are each contiguous. 52 */ 53 unsigned long 54 strtoul_l(const char * __restrict nptr, char ** __restrict endptr, int base, locale_t locale) 55 { 56 const char *s; 57 unsigned long acc; 58 char c; 59 unsigned long cutoff; 60 int neg, any, cutlim; 61 FIX_LOCALE(locale); 62 63 /* 64 * See strtol for comments as to the logic used. 65 */ 66 s = nptr; 67 do { 68 c = *s++; 69 } while (isspace_l((unsigned char)c, locale)); 70 if (c == '-') { 71 neg = 1; 72 c = *s++; 73 } else { 74 neg = 0; 75 if (c == '+') 76 c = *s++; 77 } 78 if ((base == 0 || base == 16) && 79 c == '0' && (*s == 'x' || *s == 'X') && 80 ((s[1] >= '0' && s[1] <= '9') || 81 (s[1] >= 'A' && s[1] <= 'F') || 82 (s[1] >= 'a' && s[1] <= 'f'))) { 83 c = s[1]; 84 s += 2; 85 base = 16; 86 } 87 if ((base == 0 || base == 2) && 88 c == '0' && (*s == 'b' || *s == 'B') && 89 (s[1] >= '0' && s[1] <= '1')) { 90 c = s[1]; 91 s += 2; 92 base = 2; 93 } 94 if (base == 0) 95 base = c == '0' ? 8 : 10; 96 acc = any = 0; 97 if (base < 2 || base > 36) 98 goto noconv; 99 100 cutoff = ULONG_MAX / base; 101 cutlim = ULONG_MAX % base; 102 for ( ; ; c = *s++) { 103 if (c >= '0' && c <= '9') 104 c -= '0'; 105 else if (c >= 'A' && c <= 'Z') 106 c -= 'A' - 10; 107 else if (c >= 'a' && c <= 'z') 108 c -= 'a' - 10; 109 else 110 break; 111 if (c >= base) 112 break; 113 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 114 any = -1; 115 else { 116 any = 1; 117 acc *= base; 118 acc += c; 119 } 120 } 121 if (any < 0) { 122 acc = ULONG_MAX; 123 errno = ERANGE; 124 } else if (!any) { 125 noconv: 126 errno = EINVAL; 127 } else if (neg) 128 acc = -acc; 129 if (endptr != NULL) 130 *endptr = (char *)(any ? s - 1 : nptr); 131 return (acc); 132 } 133 unsigned long 134 strtoul(const char * __restrict nptr, char ** __restrict endptr, int base) 135 { 136 return strtoul_l(nptr, endptr, base, __get_locale()); 137 } 138