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 35 #if defined(LIBC_SCCS) && !defined(lint) 36 static char sccsid[] = "from @(#)strtoul.c 8.1 (Berkeley) 6/4/93"; 37 #endif /* LIBC_SCCS and not lint */ 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 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) 89 base = c == '0' ? 8 : 10; 90 acc = any = 0; 91 if (base < 2 || base > 36) 92 goto noconv; 93 94 cutoff = UINTMAX_MAX / base; 95 cutlim = UINTMAX_MAX % base; 96 for ( ; ; c = *s++) { 97 if (c >= '0' && c <= '9') 98 c -= '0'; 99 else if (c >= 'A' && c <= 'Z') 100 c -= 'A' - 10; 101 else if (c >= 'a' && c <= 'z') 102 c -= 'a' - 10; 103 else 104 break; 105 if (c >= base) 106 break; 107 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 108 any = -1; 109 else { 110 any = 1; 111 acc *= base; 112 acc += c; 113 } 114 } 115 if (any < 0) { 116 acc = UINTMAX_MAX; 117 errno = ERANGE; 118 } else if (!any) { 119 noconv: 120 errno = EINVAL; 121 } else if (neg) 122 acc = -acc; 123 if (endptr != NULL) 124 *endptr = (char *)(any ? s - 1 : nptr); 125 return (acc); 126 } 127 uintmax_t 128 strtoumax(const char * __restrict nptr, char ** __restrict endptr, int base) 129 { 130 return strtoumax_l(nptr, endptr, base, __get_locale()); 131 } 132