1 /* $NetBSD: _wcstol.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 * @(#)strtol.c 8.1 (Berkeley) 6/4/93 33 * NetBSD: wcstol.c,v 1.1 2001/09/27 16:30:36 yamt Exp 34 * Citrus: xpg4dl/FreeBSD/lib/libc/locale/wcstol.c,v 1.2 2001/09/21 16:11:41 yamt Exp 35 */ 36 37 /* 38 * function template for wcstol, wcstoll and wcstoimax. 39 * 40 * parameters: 41 * _FUNCNAME : function name 42 * __INT : return type 43 * __INT_MIN : lower limit of the return type 44 * __INT_MAX : upper limit of the return type 45 */ 46 47 __INT 48 _FUNCNAME(nptr, endptr, base) 49 const wchar_t *nptr; 50 wchar_t **endptr; 51 int base; 52 { 53 const wchar_t *s; 54 __INT acc, cutoff; 55 wint_t wc; 56 int i; 57 int neg, any, cutlim; 58 59 _DIAGASSERT(nptr != NULL); 60 /* endptr may be NULL */ 61 62 #ifdef __GNUC__ 63 (void)&acc; (void)&cutoff; 64 #endif 65 66 /* check base value */ 67 if (base && (base < 2 || base > 36)) { 68 errno = EINVAL; 69 return 0; 70 } 71 72 /* 73 * Skip white space and pick up leading +/- sign if any. 74 * If base is 0, allow 0x for hex and 0 for octal, else 75 * assume decimal; if base is already 16, allow 0x. 76 */ 77 s = nptr; 78 do { 79 wc = (wchar_t) *s++; 80 } while (iswspace(wc)); 81 if (wc == L'-') { 82 neg = 1; 83 wc = *s++; 84 } else { 85 neg = 0; 86 if (wc == L'+') 87 wc = *s++; 88 } 89 if ((base == 0 || base == 16) && 90 wc == L'0' && (*s == L'x' || *s == L'X')) { 91 wc = s[1]; 92 s += 2; 93 base = 16; 94 } 95 if (base == 0) 96 base = wc == L'0' ? 8 : 10; 97 98 /* 99 * See strtol for comments as to the logic used. 100 */ 101 cutoff = neg ? __INT_MIN : __INT_MAX; 102 cutlim = (int)(cutoff % base); 103 cutoff /= base; 104 if (neg) { 105 if (cutlim > 0) { 106 cutlim -= base; 107 cutoff += 1; 108 } 109 cutlim = -cutlim; 110 } 111 for (acc = 0, any = 0;; wc = (wchar_t) *s++) { 112 i = __wctoint(wc); 113 if (i == -1) 114 break; 115 if (i >= base) 116 break; 117 if (any < 0) 118 continue; 119 if (neg) { 120 if (acc < cutoff || (acc == cutoff && i > cutlim)) { 121 any = -1; 122 acc = __INT_MIN; 123 errno = ERANGE; 124 } else { 125 any = 1; 126 acc *= base; 127 acc -= i; 128 } 129 } else { 130 if (acc > cutoff || (acc == cutoff && i > cutlim)) { 131 any = -1; 132 acc = __INT_MAX; 133 errno = ERANGE; 134 } else { 135 any = 1; 136 acc *= base; 137 acc += i; 138 } 139 } 140 } 141 if (endptr != 0) 142 *endptr = __UNCONST(any ? s - 1 : nptr); 143 return (acc); 144 } 145