lib/strtoimax.c

   1 /* Convert string representation of a number into an intmax_t value.
   2
   3    Copyright (C) 1999, 2001, 2002, 2003, 2004 Free Software
   4    Foundation, Inc.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2, or (at your option)
   9    any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software Foundation,
  18    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 /* Written by Paul Eggert. */
  21
  22 #if HAVE_CONFIG_H
  23 # include <config.h>
  24 #endif
  25
  26 #if HAVE_INTTYPES_H
  27 # include <inttypes.h>
  28 #endif
  29 #if HAVE_STDINT_H
  30 # include <stdint.h>
  31 #endif
  32
  33 #include <stdlib.h>
  34
  35 /* Verify a requirement at compile-time (unlike assert, which is runtime).  */
  36 #define verify(name, assertion) struct name { char a[(assertion) ? 1 : -1]; }
  37
  38 #ifdef UNSIGNED
  39 # ifndef HAVE_DECL_STRTOULL
  40 "this configure-time declaration test was not run"
  41 # endif
  42 # if !HAVE_DECL_STRTOULL && HAVE_UNSIGNED_LONG_LONG
  43 unsigned long long strtoull (char const *, char **, int);
  44 # endif
  45
  46 #else
  47
  48 # ifndef HAVE_DECL_STRTOLL
  49 "this configure-time declaration test was not run"
  50 # endif
  51 # if !HAVE_DECL_STRTOLL && HAVE_UNSIGNED_LONG_LONG
  52 long long strtoll (char const *, char **, int);
  53 # endif
  54 #endif
  55
  56 #ifdef UNSIGNED
  57 # undef HAVE_LONG_LONG
  58 # define HAVE_LONG_LONG HAVE_UNSIGNED_LONG_LONG
  59 # define INT uintmax_t
  60 # define strtoimax strtoumax
  61 # define strtol strtoul
  62 # define strtoll strtoull
  63 #else
  64 # define INT intmax_t
  65 #endif
  66
  67 INT
  68 strtoimax (char const *ptr, char **endptr, int base)
  69 {
  70 #if HAVE_LONG_LONG
  71   verify (size_is_that_of_long_or_long_long,
  72           (sizeof (INT) == sizeof (long int)
  73            || sizeof (INT) == sizeof (long long int)));
  74
  75   if (sizeof (INT) != sizeof (long int))
  76     return strtoll (ptr, endptr, base);
  77 #else
  78   verify (size_is_that_of_long,
  79           sizeof (INT) == sizeof (long int));
  80 #endif
  81
  82   return strtol (ptr, endptr, base);
  83 }