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