1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1992, 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[] = "from @(#)strtoul.c 8.1 (Berkeley) 6/4/93"; 39 #endif /* LIBC_SCCS and not lint */ 40 #include <sys/cdefs.h> 41 #include <ctype.h> 42 #include <errno.h> 43 #include <stdlib.h> 44 #include <inttypes.h> 45 #include "xlocale_private.h" 46 47 /* 48 * Convert a string to a uintmax_t integer. 49 * 50 * Assumes that the upper and lower case 51 * alphabets and digits are each contiguous. 52 */ 53 uintmax_t 54 strtoumax_l(const char * __restrict nptr, char ** __restrict endptr, int base, 55 locale_t locale) 56 { 57 const char *s; 58 uintmax_t acc; 59 char c; 60 uintmax_t cutoff; 61 int neg, any, cutlim; 62 FIX_LOCALE(locale); 63 64 /* 65 * See strtoimax for comments as to the logic used. 66 */ 67 s = nptr; 68 do { 69 c = *s++; 70 } while (isspace_l((unsigned char)c, locale)); 71 if (c == '-') { 72 neg = 1; 73 c = *s++; 74 } else { 75 neg = 0; 76 if (c == '+') 77 c = *s++; 78 } 79 if ((base == 0 || base == 16) && 80 c == '0' && (*s == 'x' || *s == 'X') && 81 ((s[1] >= '0' && s[1] <= '9') || 82 (s[1] >= 'A' && s[1] <= 'F') || 83 (s[1] >= 'a' && s[1] <= 'f'))) { 84 c = s[1]; 85 s += 2; 86 base = 16; 87 } 88 if ((base == 0 || base == 2) && 89 c == '0' && (*s == 'b' || *s == 'B') && 90 (s[1] >= '0' && s[1] <= '1')) { 91 c = s[1]; 92 s += 2; 93 base = 2; 94 } 95 if (base == 0) 96 base = c == '0' ? 8 : 10; 97 acc = any = 0; 98 if (base < 2 || base > 36) 99 goto noconv; 100 101 cutoff = UINTMAX_MAX / base; 102 cutlim = UINTMAX_MAX % base; 103 for ( ; ; c = *s++) { 104 if (c >= '0' && c <= '9') 105 c -= '0'; 106 else if (c >= 'A' && c <= 'Z') 107 c -= 'A' - 10; 108 else if (c >= 'a' && c <= 'z') 109 c -= 'a' - 10; 110 else 111 break; 112 if (c >= base) 113 break; 114 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 115 any = -1; 116 else { 117 any = 1; 118 acc *= base; 119 acc += c; 120 } 121 } 122 if (any < 0) { 123 acc = UINTMAX_MAX; 124 errno = ERANGE; 125 } else if (!any) { 126 noconv: 127 errno = EINVAL; 128 } else if (neg) 129 acc = -acc; 130 if (endptr != NULL) 131 *endptr = (char *)(any ? s - 1 : nptr); 132 return (acc); 133 } 134 uintmax_t 135 strtoumax(const char * __restrict nptr, char ** __restrict endptr, int base) 136 { 137 return strtoumax_l(nptr, endptr, base, __get_locale()); 138 } 139