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_wcstol.h revision 1.1 
      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