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wcstoul.c revision 1.1 
      1 /*	$NetBSD: wcstoul.c,v 1.1 2001/09/27 16:30:37 yamt Exp $	*/
      2 /* $Citrus: xpg4dl/FreeBSD/lib/libc/locale/wcstoul.c,v 1.2 2001/09/21 16:11:41 yamt 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. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by the University of
     19  *	California, Berkeley and its contributors.
     20  * 4. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  */
     36 
     37 #include <sys/cdefs.h>
     38 #if defined(LIBC_SCCS) && !defined(lint)
     39 #if 0
     40 static char sccsid[] = "@(#)strtoul.c	8.1 (Berkeley) 6/4/93";
     41 #else
     42 __RCSID("$NetBSD: wcstoul.c,v 1.1 2001/09/27 16:30:37 yamt Exp $");
     43 #endif
     44 #endif /* LIBC_SCCS and not lint */
     45 
     46 #include <assert.h>
     47 #include <ctype.h>
     48 #include <errno.h>
     49 #include <limits.h>
     50 #include <stdlib.h>
     51 #include <wchar.h>
     52 #include <wctype.h>
     53 
     54 #include "__wctoint.h"
     55 
     56 /*
     57  * Convert a wide-char string to an unsigned long integer.
     58  */
     59 unsigned long
     60 wcstoul(nptr, endptr, base)
     61 	const wchar_t *nptr;
     62 	wchar_t **endptr;
     63 	int base;
     64 {
     65 	const wchar_t *s;
     66 	unsigned long acc, cutoff;
     67 	wint_t wc;
     68 	int i;
     69 	int neg, any, cutlim;
     70 
     71 	_DIAGASSERT(nptr != NULL);
     72 	/* endptr may be NULL */
     73 
     74 	/* check base value */
     75 	if (base && (base < 2 || base > 36)) {
     76 		errno = EINVAL;
     77 		return 0;
     78 	}
     79 
     80 	/*
     81 	 * See strtol for comments as to the logic used.
     82 	 */
     83 	s = nptr;
     84 	do {
     85 		wc = (wchar_t) *s++;
     86 	} while (iswspace(wc));
     87 	if (wc == L'-') {
     88 		neg = 1;
     89 		wc = *s++;
     90 	} else {
     91 		neg = 0;
     92 		if (wc == L'+')
     93 			wc = *s++;
     94 	}
     95 	if ((base == 0 || base == 16) &&
     96 	    wc == L'0' && (*s == L'x' || *s == L'X')) {
     97 		wc = s[1];
     98 		s += 2;
     99 		base = 16;
    100 	}
    101 	if (base == 0)
    102 		base = wc == L'0' ? 8 : 10;
    103 
    104 	cutoff = ULONG_MAX / (unsigned long)base;
    105 	cutlim = (int)(ULONG_MAX % (unsigned long)base);
    106 	for (acc = 0, any = 0;; wc = (wchar_t) *s++) {
    107 		i = __wctoint(wc);
    108 		if (i == (wint_t)-1)
    109 			break;
    110 		if (i >= base)
    111 			break;
    112 		if (any < 0)
    113 			continue;
    114 		if (acc > cutoff || (acc == cutoff && i > cutlim)) {
    115 			any = -1;
    116 			acc = ULONG_MAX;
    117 			errno = ERANGE;
    118 		} else {
    119 			any = 1;
    120 			acc *= (unsigned long)base;
    121 			acc += i;
    122 		}
    123 	}
    124 	if (neg && any > 0)
    125 		acc = -acc;
    126 	if (endptr != 0)
    127 		/* LINTED interface specification */
    128 		*endptr = (wchar_t *)(any ? s - 1 : nptr);
    129 	return (acc);
    130 }
    131