sdcc/device/lib/wcstoull.c

   1 /*---------------------------------------------------------------------
   2    wcstoull() - convert a wide string to an unsigned long long int and return it
   3
   4    Copyright (C) 2018-2023, Philipp Klaus Krause . krauseph@informatik.uni-freiburg.de
   5                  2023, Benedikt Freisen . b.freisen@gmx.net
   6
   7    This library is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU General Public License as published by the
   9    Free Software Foundation; either version 2, or (at your option) any
  10    later version.
  11
  12    This library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this library; see the file COPYING. If not, write to the
  19    Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
  20    MA 02110-1301, USA.
  21
  22    As a special exception, if you link this library with other files,
  23    some of which are compiled with SDCC, to produce an executable,
  24    this library does not by itself cause the resulting executable to
  25    be covered by the GNU General Public License. This exception does
  26    not however invalidate any other reasons why the executable file
  27    might be covered by the GNU General Public License.
  28 -------------------------------------------------------------------------*/
  29
  30 #include <stdlib.h>
  31
  32 #include <stdbool.h>
  33 #include <ctype.h>
  34 #include <string.h>
  35 #ifdef __SDCC_LONGLONG
  36 #include <stdckdint.h>
  37 #endif
  38 #include <limits.h>
  39 #include <errno.h>
  40 #include <wchar.h>
  41
  42 #if 0 // Bug 3798
  43 static signed char _isdigit(const wchar_t c, unsigned char base)
  44 {
  45   unsigned char v;
  46
  47   if (c >= L'0' && c <= L'9')
  48     v = c - L'0';
  49   else if (c >= L'a' && c <= L'z')
  50     v = c - L'a' + 10;
  51   else if (c >= L'A' && c <= L'Z')
  52     v = c - L'A' + 10;
  53   else
  54     return (-1);
  55
  56   if (v >= base)
  57     return (-1);
  58
  59   return (v);
  60 }
  61
  62 // NOTE for maintenance: strtoull, wcstoul and wcstoull have been derived from strtoul
  63
  64 unsigned long long int wcstoull(const wchar_t *nptr, wchar_t **endptr, int base)
  65 {
  66   const wchar_t *ptr = nptr;
  67   unsigned long long int ret;
  68   bool range_error = false;
  69   bool neg = false;
  70   unsigned char b = base;
  71
  72   while (iswblank (*ptr))
  73     ptr++;
  74
  75   // Handle sign.
  76   switch(*ptr)
  77     {
  78     case L'-':
  79       neg = true;
  80     case L'+':
  81       ptr++;
  82     }
  83
  84   // base not specified.
  85   if (!b)
  86     {
  87       if (!wcsncmp (ptr, L"0x", 2) || !wcsncmp (ptr, L"0X", 2))
  88         {
  89           b = 16;
  90           ptr += 2;
  91         }
  92       else if (!wcsncmp (ptr, L"0b", 2) || !wcsncmp (ptr, L"0B", 2))
  93         {
  94           b = 2;
  95           ptr += 2;
  96         }
  97       else if (*ptr == L'0')
  98         {
  99           b = 8;
 100           ptr++;
 101         }
 102       else
 103         b = 10;
 104     }
 105   // Handle optional hex prefix.
 106   else if (b == 16 && (!wcsncmp (ptr, L"0x", 2) || !wcsncmp (ptr, L"0X", 2)))
 107     ptr += 2;
 108   else if (b == 2 && (!wcsncmp (ptr, L"0b", 2) || !wcsncmp (ptr, L"0B", 2)))
 109     ptr += 2;
 110
 111   // Empty sequence conversion error
 112   if (_isdigit (*ptr, b) < 0)
 113     {
 114       if (endptr)
 115         *endptr = (wchar_t*)nptr;
 116       return (0);
 117     }
 118
 119   for (ret = 0;; ptr++)
 120     {
 121       signed char digit = _isdigit (*ptr, b);
 122
 123       if (digit < 0)
 124         break;
 125
 126       range_error |= ckd_mul(&ret, ret, b);
 127       range_error |= ckd_add (&ret, ret, digit);
 128
 129       ret += (unsigned char)digit;
 130     }
 131
 132   if (endptr)
 133     *endptr = (wchar_t*)ptr;
 134
 135   if (range_error)
 136     {
 137       errno = ERANGE;
 138       return (ULLONG_MAX);
 139     }
 140
 141   return (neg ? -ret : ret);
 142 }
 143 #endif
 144