1 /*- 2 * Copyright (c) 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Copyright (c) 2011 The FreeBSD Foundation 6 * All rights reserved. 7 * Portions of this software were developed by David Chisnall 8 * under sponsorship from the FreeBSD Foundation. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * from @(#)strtoul.c 8.1 (Berkeley) 6/4/93 35 * $FreeBSD: head/lib/libc/stdlib/strtoumax.c 251672 2013-06-13 00:19:30Z emaste $ 36 */ 37 38 39 #include <ctype.h> 40 #include <errno.h> 41 #include <stdlib.h> 42 #include <inttypes.h> 43 #include "xlocale_private.h" 44 45 /* 46 * Convert a string to a uintmax_t integer. 47 * 48 * Assumes that the upper and lower case 49 * alphabets and digits are each contiguous. 50 */ 51 uintmax_t 52 strtoumax_l(const char * __restrict nptr, char ** __restrict endptr, int base, 53 locale_t locale) 54 { 55 const char *s; 56 uintmax_t acc; 57 char c; 58 uintmax_t cutoff; 59 int neg, any, cutlim; 60 FIX_LOCALE(locale); 61 62 /* 63 * See strtoimax 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) 87 base = c == '0' ? 8 : 10; 88 acc = any = 0; 89 if (base < 2 || base > 36) 90 goto noconv; 91 92 cutoff = UINTMAX_MAX / base; 93 cutlim = UINTMAX_MAX % base; 94 for ( ; ; c = *s++) { 95 if (c >= '0' && c <= '9') 96 c -= '0'; 97 else if (c >= 'A' && c <= 'Z') 98 c -= 'A' - 10; 99 else if (c >= 'a' && c <= 'z') 100 c -= 'a' - 10; 101 else 102 break; 103 if (c >= base) 104 break; 105 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 106 any = -1; 107 else { 108 any = 1; 109 acc *= base; 110 acc += c; 111 } 112 } 113 if (any < 0) { 114 acc = UINTMAX_MAX; 115 errno = ERANGE; 116 } else if (!any) { 117 noconv: 118 errno = EINVAL; 119 } else if (neg) 120 acc = -acc; 121 if (endptr != NULL) 122 *endptr = (char *)(any ? s - 1 : nptr); 123 return (acc); 124 } 125 uintmax_t 126 strtoumax(const char * __restrict nptr, char ** __restrict endptr, int base) 127 { 128 return strtoumax_l(nptr, endptr, base, __get_locale()); 129 } 130