1 /* $OpenBSD: _wcstol.h,v 1.1 2005/07/01 08:59:27 espie Exp $ */ 2 /* $NetBSD: _wcstol.h,v 1.2 2003/08/07 16:43:03 agc Exp $ */ 3 4 /*- 5 * Copyright (c) 1990, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * Original version ID: 33 * @(#)strtol.c 8.1 (Berkeley) 6/4/93 34 * NetBSD: wcstol.c,v 1.1 2001/09/27 16:30:36 yamt Exp 35 * Citrus: xpg4dl/FreeBSD/lib/libc/locale/wcstol.c,v 1.2 2001/09/21 16:11:41 yamt Exp 36 */ 37 38 /* 39 * function template for wcstol, wcstoll and wcstoimax. 40 * 41 * parameters: 42 * FUNCNAME : function name 43 * int_type : return type 44 * MIN_VALUE : lower limit of the return type 45 * MAX_VALUE : upper limit of the return type 46 */ 47 48 int_type 49 FUNCNAME(const wchar_t *nptr, wchar_t **endptr, int base) 50 { 51 const wchar_t *s; 52 int_type acc, cutoff; 53 wint_t wc; 54 int i; 55 int neg, any, cutlim; 56 57 /* check base value */ 58 if (base && (base < 2 || base > 36)) { 59 errno = EINVAL; 60 return 0; 61 } 62 63 /* 64 * Skip white space and pick up leading +/- sign if any. 65 * If base is 0, allow 0x for hex and 0 for octal, else 66 * assume decimal; if base is already 16, allow 0x. 67 */ 68 s = nptr; 69 do { 70 wc = (wchar_t) *s++; 71 } while (iswspace(wc)); 72 if (wc == L'-') { 73 neg = 1; 74 wc = *s++; 75 } else { 76 neg = 0; 77 if (wc == L'+') 78 wc = *s++; 79 } 80 if ((base == 0 || base == 16) && 81 wc == L'0' && (*s == L'x' || *s == L'X')) { 82 wc = s[1]; 83 s += 2; 84 base = 16; 85 } 86 if (base == 0) 87 base = wc == L'0' ? 8 : 10; 88 89 /* 90 * See strtol for comments as to the logic used. 91 */ 92 cutoff = neg ? MIN_VALUE : MAX_VALUE; 93 cutlim = (int)(cutoff % base); 94 cutoff /= base; 95 if (neg) { 96 if (cutlim > 0) { 97 cutlim -= base; 98 cutoff += 1; 99 } 100 cutlim = -cutlim; 101 } 102 for (acc = 0, any = 0;; wc = (wchar_t) *s++) { 103 i = wctoint(wc); 104 if (i == -1) 105 break; 106 if (i >= base) 107 break; 108 if (any < 0) 109 continue; 110 if (neg) { 111 if (acc < cutoff || (acc == cutoff && i > cutlim)) { 112 any = -1; 113 acc = MIN_VALUE; 114 errno = ERANGE; 115 } else { 116 any = 1; 117 acc *= base; 118 acc -= i; 119 } 120 } else { 121 if (acc > cutoff || (acc == cutoff && i > cutlim)) { 122 any = -1; 123 acc = MAX_VALUE; 124 errno = ERANGE; 125 } else { 126 any = 1; 127 acc *= base; 128 acc += i; 129 } 130 } 131 } 132 if (endptr != 0) 133 /* LINTED interface specification */ 134 *endptr = (wchar_t *)(any ? s - 1 : nptr); 135 return (acc); 136 } 137