1 /* $NetBSD: _wcstoul.h,v 1.3 2005/11/29 03:11:59 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * Original version ID: 32 * @(#)strtoul.c 8.1 (Berkeley) 6/4/93 33 * Citrus: xpg4dl/FreeBSD/lib/libc/locale/wcstoul.c,v 1.2 2001/09/21 16:11:41 yamt Exp 34 * NetBSD: wcstoul.c,v 1.1 2001/09/27 16:30:37 yamt Exp 35 */ 36 37 /* 38 * function template for wcstoul, wcstoull and wcstoumax. 39 * 40 * parameters: 41 * _FUNCNAME : function name 42 * __UINT : return type 43 * __UINT_MAX : upper limit of the return type 44 */ 45 46 __UINT 47 _FUNCNAME(nptr, endptr, base) 48 const wchar_t *nptr; 49 wchar_t **endptr; 50 int base; 51 { 52 const wchar_t *s; 53 __UINT acc, cutoff; 54 wint_t wc; 55 int i; 56 int neg, any, cutlim; 57 58 _DIAGASSERT(nptr != NULL); 59 /* endptr may be NULL */ 60 61 if (base && (base < 2 || base > 36)) { 62 errno = EINVAL; 63 return 0; 64 } 65 66 /* 67 * Skip white space and pick up leading +/- sign if any. 68 * If base is 0, allow 0x for hex and 0 for octal, else 69 * assume decimal; if base is already 16, allow 0x. 70 */ 71 s = nptr; 72 do { 73 wc = (wchar_t) *s++; 74 } while (iswspace(wc)); 75 if (wc == L'-') { 76 neg = 1; 77 wc = *s++; 78 } else { 79 neg = 0; 80 if (wc == L'+') 81 wc = *s++; 82 } 83 if ((base == 0 || base == 16) && 84 wc == L'0' && (*s == L'x' || *s == L'X')) { 85 wc = s[1]; 86 s += 2; 87 base = 16; 88 } 89 if (base == 0) 90 base = wc == L'0' ? 8 : 10; 91 92 /* 93 * See strtoul for comments as to the logic used. 94 */ 95 cutoff = __UINT_MAX / (__UINT)base; 96 cutlim = (int)(__UINT_MAX % (__UINT)base); 97 for (acc = 0, any = 0;; wc = (wchar_t) *s++) { 98 i = __wctoint(wc); 99 if (i == (wint_t)-1) 100 break; 101 if (i >= base) 102 break; 103 if (any < 0) 104 continue; 105 if (acc > cutoff || (acc == cutoff && i > cutlim)) { 106 any = -1; 107 acc = __UINT_MAX; 108 errno = ERANGE; 109 } else { 110 any = 1; 111 acc *= (__UINT)base; 112 acc += i; 113 } 114 } 115 if (neg && any > 0) 116 acc = -acc; 117 if (endptr != 0) 118 *endptr = __UNCONST(any ? s - 1 : nptr); 119 return (acc); 120 } 121