1 /* $NetBSD: _wcstol.h,v 1.1 2003/03/11 09:21:23 tshiozak 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * Original version ID: 36 * @(#)strtol.c 8.1 (Berkeley) 6/4/93 37 * NetBSD: wcstol.c,v 1.1 2001/09/27 16:30:36 yamt Exp 38 * Citrus: xpg4dl/FreeBSD/lib/libc/locale/wcstol.c,v 1.2 2001/09/21 16:11:41 yamt Exp 39 */ 40 41 /* 42 * function template for wcstol, wcstoll and wcstoimax. 43 * 44 * parameters: 45 * _FUNCNAME : function name 46 * __INT : return type 47 * __INT_MIN : lower limit of the return type 48 * __INT_MAX : upper limit of the return type 49 */ 50 51 __INT 52 _FUNCNAME(nptr, endptr, base) 53 const wchar_t *nptr; 54 wchar_t **endptr; 55 int base; 56 { 57 const wchar_t *s; 58 __INT acc, cutoff; 59 wint_t wc; 60 int i; 61 int neg, any, cutlim; 62 63 _DIAGASSERT(nptr != NULL); 64 /* endptr may be NULL */ 65 66 #ifdef __GNUC__ 67 (void)&acc; (void)&cutoff; 68 #endif 69 70 /* check base value */ 71 if (base && (base < 2 || base > 36)) { 72 errno = EINVAL; 73 return 0; 74 } 75 76 /* 77 * Skip white space and pick up leading +/- sign if any. 78 * If base is 0, allow 0x for hex and 0 for octal, else 79 * assume decimal; if base is already 16, allow 0x. 80 */ 81 s = nptr; 82 do { 83 wc = (wchar_t) *s++; 84 } while (iswspace(wc)); 85 if (wc == L'-') { 86 neg = 1; 87 wc = *s++; 88 } else { 89 neg = 0; 90 if (wc == L'+') 91 wc = *s++; 92 } 93 if ((base == 0 || base == 16) && 94 wc == L'0' && (*s == L'x' || *s == L'X')) { 95 wc = s[1]; 96 s += 2; 97 base = 16; 98 } 99 if (base == 0) 100 base = wc == L'0' ? 8 : 10; 101 102 /* 103 * See strtol for comments as to the logic used. 104 */ 105 cutoff = neg ? __INT_MIN : __INT_MAX; 106 cutlim = (int)(cutoff % base); 107 cutoff /= base; 108 if (neg) { 109 if (cutlim > 0) { 110 cutlim -= base; 111 cutoff += 1; 112 } 113 cutlim = -cutlim; 114 } 115 for (acc = 0, any = 0;; wc = (wchar_t) *s++) { 116 i = __wctoint(wc); 117 if (i == -1) 118 break; 119 if (i >= base) 120 break; 121 if (any < 0) 122 continue; 123 if (neg) { 124 if (acc < cutoff || (acc == cutoff && i > cutlim)) { 125 any = -1; 126 acc = __INT_MIN; 127 errno = ERANGE; 128 } else { 129 any = 1; 130 acc *= base; 131 acc -= i; 132 } 133 } else { 134 if (acc > cutoff || (acc == cutoff && i > cutlim)) { 135 any = -1; 136 acc = __INT_MAX; 137 errno = ERANGE; 138 } else { 139 any = 1; 140 acc *= base; 141 acc += i; 142 } 143 } 144 } 145 if (endptr != 0) 146 /* LINTED interface specification */ 147 *endptr = (wchar_t *)(any ? s - 1 : nptr); 148 return (acc); 149 } 150