common/lib/libc/stdlib/_strtoul.h

   1 /* $NetBSD: _strtoul.h,v 1.7 2013/05/17 12:55:56 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) || \
  44     defined(HAVE_NBTOOL_CONFIG_H) || defined(BCS_ONLY)
  45 __UINT
  46 _FUNCNAME(const char *nptr, char **endptr, int base)
  47 #else
  48 #include <locale.h>
  49 #include "setlocale_local.h"
  50 #define INT_FUNCNAME_(pre, name, post)  pre ## name ## post
  51 #define INT_FUNCNAME(pre, name, post)   INT_FUNCNAME_(pre, name, post)
  52
  53 static __UINT
  54 INT_FUNCNAME(_int_, _FUNCNAME, _l)(const char *nptr, char **endptr,
  55                                    int base, locale_t loc)
  56 #endif
  57 {
  58         const char *s;
  59         __UINT acc, cutoff;
  60         unsigned char c;
  61         int i, neg, any, cutlim;
  62
  63         _DIAGASSERT(nptr != NULL);
  64         /* endptr may be NULL */
  65
  66         /* check base value */
  67         if (base && (base < 2 || base > 36)) {
  68 #if !defined(_KERNEL) && !defined(_STANDALONE)
  69                 errno = EINVAL;
  70                 return(0);
  71 #else
  72                 panic("%s: invalid base %d", __func__, base);
  73 #endif
  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 #if defined(_KERNEL) || defined(_STANDALONE) || \
  83     defined(HAVE_NBTOOL_CONFIG_H) || defined(BCS_ONLY)
  84         do {
  85                 c = *s++;
  86         } while (isspace(c));
  87 #else
  88         do {
  89                 c = *s++;
  90         } while (isspace_l(c, loc));
  91 #endif
  92         if (c == '-') {
  93                 neg = 1;
  94                 c = *s++;
  95         } else {
  96                 neg = 0;
  97                 if (c == '+')
  98                         c = *s++;
  99         }
 100         if ((base == 0 || base == 16) &&
 101             c == '0' && (*s == 'x' || *s == 'X')) {
 102                 c = s[1];
 103                 s += 2;
 104                 base = 16;
 105         }
 106         if (base == 0)
 107                 base = (c == '0' ? 8 : 10);
 108
 109         /*
 110          * See strtol for comments as to the logic used.
 111          */
 112         cutoff = ((__UINT)__UINT_MAX / (__UINT)base);
 113         cutlim = (int)((__UINT)__UINT_MAX % (__UINT)base);
 114         for (acc = 0, any = 0;; c = *s++) {
 115                 if (c >= '0' && c <= '9')
 116                         i = c - '0';
 117                 else if (c >= 'a' && c <= 'z')
 118                         i = (c - 'a') + 10;
 119                 else if (c >= 'A' && c <= 'Z')
 120                         i = (c - 'A') + 10;
 121                 else
 122                         break;
 123                 if (i >= base)
 124                         break;
 125                 if (any < 0)
 126                         continue;
 127                 if (acc > cutoff || (acc == cutoff && i > cutlim)) {
 128                         acc = __UINT_MAX;
 129 #if !defined(_KERNEL) && !defined(_STANDALONE)
 130                         any = -1;
 131                         errno = ERANGE;
 132 #else
 133                         any = 0;
 134                         break;
 135 #endif
 136                 } else {
 137                         any = 1;
 138                         acc *= (__UINT)base;
 139                         acc += i;
 140                 }
 141         }
 142         if (neg && any > 0)
 143                 acc = -acc;
 144         if (endptr != NULL)
 145                 /* LINTED interface specification */
 146                 *endptr = __UNCONST(any ? s - 1 : nptr);
 147         return(acc);
 148 }
 149
 150 #if !defined(_KERNEL) && !defined(_STANDALONE) && \
 151     !defined(HAVE_NBTOOL_CONFIG_H) && !defined(BCS_ONLY)
 152 __UINT
 153 _FUNCNAME(const char *nptr, char **endptr, int base)
 154 {
 155         return INT_FUNCNAME(_int_, _FUNCNAME, _l)(nptr, endptr, base, _current_locale());
 156 }
 157
 158 __UINT
 159 INT_FUNCNAME(, _FUNCNAME, _l)(const char *nptr, char **endptr, int base, locale_t loc)
 160 {
 161         return INT_FUNCNAME(_int_, _FUNCNAME, _l)(nptr, endptr, base, loc);
 162 }
 163 #endif