1 /* 2 * Copyright (c) 1990, 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[] = "@(#)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 <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) 88 base = c == '0' ? 8 : 10; 89 acc = any = 0; 90 if (base < 2 || base > 36) 91 goto noconv; 92 93 cutoff = ULONG_MAX / base; 94 cutlim = ULONG_MAX % base; 95 for ( ; ; c = *s++) { 96 if (c >= '0' && c <= '9') 97 c -= '0'; 98 else if (c >= 'A' && c <= 'Z') 99 c -= 'A' - 10; 100 else if (c >= 'a' && c <= 'z') 101 c -= 'a' - 10; 102 else 103 break; 104 if (c >= base) 105 break; 106 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 107 any = -1; 108 else { 109 any = 1; 110 acc *= base; 111 acc += c; 112 } 113 } 114 if (any < 0) { 115 acc = ULONG_MAX; 116 errno = ERANGE; 117 } else if (!any) { 118 noconv: 119 errno = EINVAL; 120 } else if (neg) 121 acc = -acc; 122 if (endptr != NULL) 123 *endptr = (char *)(any ? s - 1 : nptr); 124 return (acc); 125 } 126 unsigned long 127 strtoul(const char * __restrict nptr, char ** __restrict endptr, int base) 128 { 129 return strtoul_l(nptr, endptr, base, __get_locale()); 130 } 131