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 <limits.h> 41 #include <ctype.h> 42 #include <errno.h> 43 #include <stdlib.h> 44 #include "xlocale_private.h" 45 46 /* 47 * Convert a string to an unsigned long integer. 48 * 49 * Assumes that the upper and lower case 50 * alphabets and digits are each contiguous. 51 */ 52 unsigned long 53 strtoul_l(const char * __restrict nptr, char ** __restrict endptr, int base, locale_t locale) 54 { 55 const char *s; 56 unsigned long acc; 57 char c; 58 unsigned long cutoff; 59 int neg, any, cutlim; 60 FIX_LOCALE(locale); 61 62 /* 63 * See strtol for comments as to the logic used. 64 */ 65 s = nptr; 66 do { 67 c = *s++; 68 } while (isspace_l((unsigned char)c, locale)); 69 if (c == '-') { 70 neg = 1; 71 c = *s++; 72 } else { 73 neg = 0; 74 if (c == '+') 75 c = *s++; 76 } 77 if ((base == 0 || base == 16) && 78 c == '0' && (*s == 'x' || *s == 'X') && 79 ((s[1] >= '0' && s[1] <= '9') || 80 (s[1] >= 'A' && s[1] <= 'F') || 81 (s[1] >= 'a' && s[1] <= 'f'))) { 82 c = s[1]; 83 s += 2; 84 base = 16; 85 } 86 if ((base == 0 || base == 2) && 87 c == '0' && (*s == 'b' || *s == 'B') && 88 (s[1] >= '0' && s[1] <= '1')) { 89 c = s[1]; 90 s += 2; 91 base = 2; 92 } 93 if (base == 0) 94 base = c == '0' ? 8 : 10; 95 acc = any = 0; 96 if (base < 2 || base > 36) 97 goto noconv; 98 99 cutoff = ULONG_MAX / base; 100 cutlim = ULONG_MAX % base; 101 for ( ; ; c = *s++) { 102 if (c >= '0' && c <= '9') 103 c -= '0'; 104 else if (c >= 'A' && c <= 'Z') 105 c -= 'A' - 10; 106 else if (c >= 'a' && c <= 'z') 107 c -= 'a' - 10; 108 else 109 break; 110 if (c >= base) 111 break; 112 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 113 any = -1; 114 else { 115 any = 1; 116 acc *= base; 117 acc += c; 118 } 119 } 120 if (any < 0) { 121 acc = ULONG_MAX; 122 errno = ERANGE; 123 } else if (!any) { 124 noconv: 125 errno = EINVAL; 126 } else if (neg) 127 acc = -acc; 128 if (endptr != NULL) 129 *endptr = (char *)(any ? s - 1 : nptr); 130 return (acc); 131 } 132 unsigned long 133 strtoul(const char * __restrict nptr, char ** __restrict endptr, int base) 134 { 135 return strtoul_l(nptr, endptr, base, __get_locale()); 136 } 137