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_wcstol.h revision 1.5 
      1 /* $NetBSD: _wcstol.h,v 1.5 2013/04/16 16:52:13 joerg 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. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  *
     31  * Original version ID:
     32  * @(#)strtol.c	8.1 (Berkeley) 6/4/93
     33  * NetBSD: wcstol.c,v 1.1 2001/09/27 16:30:36 yamt Exp
     34  * Citrus: xpg4dl/FreeBSD/lib/libc/locale/wcstol.c,v 1.2 2001/09/21 16:11:41 yamt Exp
     35  */
     36 
     37 /*
     38  * function template for wcstol, wcstoll and wcstoimax.
     39  *
     40  * parameters:
     41  *	_FUNCNAME : function name
     42  *      __INT     : return type
     43  *      __INT_MIN : lower limit of the return type
     44  *      __INT_MAX : upper limit of the return type
     45  */
     46 
     47 #include <locale.h>
     48 #include "setlocale_local.h"
     49 #define INT_FUNCNAME_(pre, name, post)	pre ## name ## post
     50 #define INT_FUNCNAME(pre, name, post)	INT_FUNCNAME_(pre, name, post)
     51 
     52 static __INT
     53 INT_FUNCNAME(_int_, _FUNCNAME, _l)(const wchar_t *nptr, wchar_t **endptr,
     54 				   int base, locale_t loc)
     55 {
     56 	const wchar_t *s;
     57 	__INT 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 #ifdef __GNUC__
     66 	(void)&acc; (void)&cutoff;
     67 #endif
     68 
     69 	/* check base value */
     70 	if (base && (base < 2 || base > 36)) {
     71 		errno = EINVAL;
     72 		return 0;
     73 	}
     74 
     75 	/*
     76 	 * Skip white space and pick up leading +/- sign if any.
     77 	 * If base is 0, allow 0x for hex and 0 for octal, else
     78 	 * assume decimal; if base is already 16, allow 0x.
     79 	 */
     80 	s = nptr;
     81 	do {
     82 		wc = (wchar_t) *s++;
     83 	} while (iswspace_l(wc, loc));
     84 	if (wc == L'-') {
     85 		neg = 1;
     86 		wc = *s++;
     87 	} else {
     88 		neg = 0;
     89 		if (wc == L'+')
     90 			wc = *s++;
     91 	}
     92 	if ((base == 0 || base == 16) &&
     93 	    wc == L'0' && (*s == L'x' || *s == L'X')) {
     94 		wc = s[1];
     95 		s += 2;
     96 		base = 16;
     97 	}
     98 	if (base == 0)
     99 		base = wc == L'0' ? 8 : 10;
    100 
    101 	/*
    102 	 * See strtol for comments as to the logic used.
    103 	 */
    104 	cutoff = neg ? __INT_MIN : __INT_MAX;
    105 	cutlim = (int)(cutoff % base);
    106 	cutoff /= base;
    107 	if (neg) {
    108 		if (cutlim > 0) {
    109 			cutlim -= base;
    110 			cutoff += 1;
    111 		}
    112 		cutlim = -cutlim;
    113 	}
    114 	for (acc = 0, any = 0;; wc = (wchar_t) *s++) {
    115 		i = __wctoint(wc);
    116 		if (i == -1)
    117 			break;
    118 		if (i >= base)
    119 			break;
    120 		if (any < 0)
    121 			continue;
    122 		if (neg) {
    123 			if (acc < cutoff || (acc == cutoff && i > cutlim)) {
    124 				any = -1;
    125 				acc = __INT_MIN;
    126 				errno = ERANGE;
    127 			} else {
    128 				any = 1;
    129 				acc *= base;
    130 				acc -= i;
    131 			}
    132 		} else {
    133 			if (acc > cutoff || (acc == cutoff && i > cutlim)) {
    134 				any = -1;
    135 				acc = __INT_MAX;
    136 				errno = ERANGE;
    137 			} else {
    138 				any = 1;
    139 				acc *= base;
    140 				acc += i;
    141 			}
    142 		}
    143 	}
    144 	if (endptr != 0)
    145 		*endptr = __UNCONST(any ? s - 1 : nptr);
    146 	return (acc);
    147 }
    148 
    149 __INT
    150 _FUNCNAME(const wchar_t *nptr, wchar_t **endptr, int base)
    151 {
    152 	return INT_FUNCNAME(_int_, _FUNCNAME, _l)(nptr, endptr, base,
    153 						  *_current_locale());
    154 }
    155 
    156 __INT
    157 INT_FUNCNAME(, _FUNCNAME, _l)(const wchar_t *nptr, wchar_t **endptr,
    158 			      int base, locale_t loc)
    159 {
    160 	if (loc == NULL)
    161 		loc = _C_locale;
    162 	return INT_FUNCNAME(_int_, _FUNCNAME, _l)(nptr, endptr, base, loc);
    163 }
    164