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_strtoul.h revision 1.5 
      1 /* $NetBSD: _strtoul.h,v 1.5 2013/04/16 21:44:06 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  * NetBSD: src/lib/libc/locale/_wcstoul.h,v 1.2 2003/08/07 16:43:03 agc Exp
     33  */
     34 
     35 /*
     36  * function template for strtoul, strtoull and strtoumax.
     37  *
     38  * parameters:
     39  *	_FUNCNAME  : function name
     40  *      __UINT     : return type
     41  *      __UINT_MAX : upper limit of the return type
     42  */
     43 #if defined(_KERNEL) || defined(_STANDALONE) || defined(HAVE_NBTOOL_CONFIG_H)
     44 __UINT
     45 _FUNCNAME(const char *nptr, char **endptr, int base)
     46 #else
     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 __UINT
     53 INT_FUNCNAME(_int_, _FUNCNAME, _l)(const char *nptr, char **endptr,
     54 				   int base, locale_t loc)
     55 #endif
     56 {
     57 	const char *s;
     58 	__UINT acc, cutoff;
     59 	unsigned char c;
     60 	int i, neg, any, cutlim;
     61 
     62 	_DIAGASSERT(nptr != NULL);
     63 	/* endptr may be NULL */
     64 
     65 	/* check base value */
     66 	if (base && (base < 2 || base > 36)) {
     67 #if !defined(_KERNEL) && !defined(_STANDALONE)
     68 		errno = EINVAL;
     69 		return(0);
     70 #else
     71 		panic("%s: invalid base %d", __func__, base);
     72 #endif
     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 #if defined(_KERNEL) || defined(_STANDALONE) || defined(HAVE_NBTOOL_CONFIG_H)
     82 	do {
     83 		c = *s++;
     84 	} while (isspace(c));
     85 #else
     86 	do {
     87 		c = *s++;
     88 	} while (isspace_l(c, loc));
     89 #endif
     90 	if (c == '-') {
     91 		neg = 1;
     92 		c = *s++;
     93 	} else {
     94 		neg = 0;
     95 		if (c == '+')
     96 			c = *s++;
     97 	}
     98 	if ((base == 0 || base == 16) &&
     99 	    c == '0' && (*s == 'x' || *s == 'X')) {
    100 		c = s[1];
    101 		s += 2;
    102 		base = 16;
    103 	}
    104 	if (base == 0)
    105 		base = (c == '0' ? 8 : 10);
    106 
    107 	/*
    108 	 * See strtol for comments as to the logic used.
    109 	 */
    110 	cutoff = ((__UINT)__UINT_MAX / (__UINT)base);
    111 	cutlim = (int)((__UINT)__UINT_MAX % (__UINT)base);
    112 	for (acc = 0, any = 0;; c = *s++) {
    113 		if (c >= '0' && c <= '9')
    114 			i = c - '0';
    115 		else if (c >= 'a' && c <= 'z')
    116 			i = (c - 'a') + 10;
    117 		else if (c >= 'A' && c <= 'Z')
    118 			i = (c - 'A') + 10;
    119 		else
    120 			break;
    121 		if (i >= base)
    122 			break;
    123 		if (any < 0)
    124 			continue;
    125 		if (acc > cutoff || (acc == cutoff && i > cutlim)) {
    126 			acc = __UINT_MAX;
    127 #if !defined(_KERNEL) && !defined(_STANDALONE)
    128 			any = -1;
    129 			errno = ERANGE;
    130 #else
    131 			any = 0;
    132 			break;
    133 #endif
    134 		} else {
    135 			any = 1;
    136 			acc *= (__UINT)base;
    137 			acc += i;
    138 		}
    139 	}
    140 	if (neg && any > 0)
    141 		acc = -acc;
    142 	if (endptr != NULL)
    143 		/* LINTED interface specification */
    144 		*endptr = __UNCONST(any ? s - 1 : nptr);
    145 	return(acc);
    146 }
    147 
    148 #if !defined(_KERNEL) && !defined(_STANDALONE) && !defined(HAVE_NBTOOL_CONFIG_H)
    149 __UINT
    150 _FUNCNAME(const char *nptr, char **endptr, int base)
    151 {
    152 	return INT_FUNCNAME(_int_, _FUNCNAME, _l)(nptr, endptr, base, *_current_locale());
    153 }
    154 
    155 __UINT
    156 INT_FUNCNAME(, _FUNCNAME, _l)(const char *nptr, char **endptr, int base, locale_t loc)
    157 {
    158 	if (loc == NULL)
    159 		loc = _C_locale;
    160 	return INT_FUNCNAME(_int_, _FUNCNAME, _l)(nptr, endptr, base, loc);
    161 }
    162 #endif
    163