lib/strtoumax.c

   1 /* Convert string representation of a number into an uintmax_t value.
   2    Copyright 1999 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 #endif
  27
  28 #if HAVE_STDLIB_H
  29 # include <stdlib.h>
  30 #endif
  31
  32 #ifndef PARAMS
  33 # if defined PROTOTYPES || defined __STDC__
  34 #  define PARAMS(Args) Args
  35 # else
  36 #  define PARAMS(Args) ()
  37 # endif
  38 #endif
  39
  40 #if NEED_STRTOUL_DECL
  41 unsigned long strtoul PARAMS ((char const *, char **, int));
  42 #endif
  43
  44 #if NEED_STRTOULL_DECL && HAVE_UNSIGNED_LONG_LONG
  45 unsigned long long strtoull PARAMS ((char const *, char **, int));
  46 #endif
  47
  48 uintmax_t
  49 strtoumax (char const *ptr, char **endptr, int base)
  50 {
  51 #define USE_IF_EQUIVALENT(function) \
  52     if (sizeof (uintmax_t) == sizeof function (ptr, endptr, base)) \
  53       return function (ptr, endptr, base);
  54
  55 #if HAVE_UNSIGNED_LONG_LONG
  56     USE_IF_EQUIVALENT (strtoull)
  57 #endif
  58
  59   USE_IF_EQUIVALENT (strtoul)
  60
  61   abort ();
  62 }
  63
  64 #ifdef TESTING
  65 # include <stdio.h>
  66 int
  67 main ()
  68 {
  69   char *p, *endptr;
  70   printf ("sizeof uintmax_t: %d\n", sizeof (uintmax_t));
  71   printf ("sizeof strtoull(): %d\n", sizeof strtoull(p, &endptr, 10));
  72   printf ("sizeof strtoul(): %d\n", sizeof strtoul(p, &endptr, 10));
  73   exit (0);
  74 }
  75 #endif