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 #ifndef HAVE_DECL_STRTOUL
  41 "this configure-time declaration test was not run"
  42 #endif
  43 #if !HAVE_DECL_STRTOUL
  44 unsigned long strtoul PARAMS ((char const *, char **, int));
  45 #endif
  46
  47 #ifndef HAVE_DECL_STRTOULL
  48 "this configure-time declaration test was not run"
  49 #endif
  50 #if !HAVE_DECL_STRTOULL && HAVE_UNSIGNED_LONG_LONG
  51 unsigned long long strtoull PARAMS ((char const *, char **, int));
  52 #endif
  53
  54 uintmax_t
  55 strtoumax (char const *ptr, char **endptr, int base)
  56 {
  57 #define USE_IF_EQUIVALENT(function) \
  58     if (sizeof (uintmax_t) == sizeof function (ptr, endptr, base)) \
  59       return function (ptr, endptr, base);
  60
  61 #if HAVE_UNSIGNED_LONG_LONG
  62     USE_IF_EQUIVALENT (strtoull)
  63 #endif
  64
  65   USE_IF_EQUIVALENT (strtoul)
  66
  67   abort ();
  68 }
  69
  70 #ifdef TESTING
  71 # include <stdio.h>
  72 int
  73 main ()
  74 {
  75   char *p, *endptr;
  76   printf ("sizeof uintmax_t: %d\n", sizeof (uintmax_t));
  77   printf ("sizeof strtoull(): %d\n", sizeof strtoull(p, &endptr, 10));
  78   printf ("sizeof strtoul(): %d\n", sizeof strtoul(p, &endptr, 10));
  79   exit (0);
  80 }
  81 #endif