strtoimax.c

制作2.6内核的CLFS时 使用的diffutils-2.8.7.tar.gz包

/* Convert string representation of a number into an intmax_t value.
   Copyright (C) 1999, 2001, 2002, 2003 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software Foundation,
   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

/* Written by Paul Eggert. */

#if HAVE_CONFIG_H
# include <config.h>
#endif

#if HAVE_INTTYPES_H
# include <inttypes.h>
#elif HAVE_STDINT_H
# include <stdint.h>
#endif

#include <stdlib.h>

/* Verify a requirement at compile-time (unlike assert, which is runtime).  */
#define verify(name, assertion) struct name { char a[(assertion) ? 1 : -1]; }

#ifdef UNSIGNED
# ifndef HAVE_DECL_STRTOULL
"this configure-time declaration test was not run"
# endif
# if !HAVE_DECL_STRTOULL && HAVE_UNSIGNED_LONG_LONG
unsigned long long strtoull (char const *, char **, int);
# endif

#else

# ifndef HAVE_DECL_STRTOLL
"this configure-time declaration test was not run"
# endif
# if !HAVE_DECL_STRTOLL && HAVE_UNSIGNED_LONG_LONG
long long strtoll (char const *, char **, int);
# endif
#endif

#ifdef UNSIGNED
# undef HAVE_LONG_LONG
# define HAVE_LONG_LONG HAVE_UNSIGNED_LONG_LONG
# define INT uintmax_t
# define strtoimax strtoumax
# define strtol strtoul
# define strtoll strtoull
#else
# define INT intmax_t
#endif

INT
strtoimax (char const *ptr, char **endptr, int base)
{
#if HAVE_LONG_LONG
  verify (size_is_that_of_long_or_long_long,
	  (sizeof (INT) == sizeof (long)
	   || sizeof (INT) == sizeof (long long)));

  if (sizeof (INT) != sizeof (long))
    return strtoll (ptr, endptr, base);
#else
  verify (size_is_that_of_long,
	  sizeof (INT) == sizeof (long));
#endif

  return strtol (ptr, endptr, base);
}