sdcc/device/lib/strtoll.c

   1 /*---------------------------------------------------------------------
   2    strtoll() - convert a string to a 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 <limits.h>
  35 #include <errno.h>
  36
  37 #pragma disable_warning 196
  38
  39 // NOTE: strtoll has been derived from strtol
  40
  41 #if __SDCC_LONGLONG
  42 long long int strtoll(const char *nptr, char **endptr, int base)
  43 {
  44   const char *ptr = nptr;
  45   const char *rptr;
  46   unsigned long long int u;
  47   bool neg;
  48
  49   while (isblank (*ptr))
  50     ptr++;
  51
  52   neg = (*ptr == '-');
  53
  54   if (*ptr == '-')
  55     {
  56       neg = true;
  57       ptr++;
  58     }
  59   else
  60     neg = false;
  61
  62   // strtoull() would accept leading blanks or signs (that might come after '-' handled above)
  63   if (neg && (isblank (*ptr) || *ptr == '-' || *ptr == '+'))
  64     {
  65       if (endptr)
  66         *endptr = nptr;
  67       return (0);
  68     }
  69
  70   u = strtoull(ptr, &rptr, base);
  71
  72   // Check for conversion error
  73   if (rptr == ptr)
  74     {
  75       if (endptr)
  76         *endptr = nptr;
  77       return (0);
  78     }
  79
  80   if (endptr)
  81     *endptr = rptr;
  82
  83   // Check for range error
  84   if (!neg && u > LLONG_MAX)
  85     {
  86       errno = ERANGE;
  87       return (LLONG_MAX);
  88     }
  89   else if (neg && u > -LLONG_MIN)
  90     {
  91       errno = ERANGE;
  92       return (LLONG_MIN);
  93     }
  94
  95   return (neg ? -u : u);
  96 }
  97 #endif