contrib/diffutils-2.8/lib/strtoimax.c

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