Dogcows Code - chaz/tar/blob - lib/strtoimax.c

   1 /* Convert string representation of a number into an intmax_t value.
   2
   3    Copyright (C) 1999, 2001 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 2, or (at your option)
   8    any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software Foundation,
  17    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  18
  19 /* Written by Paul Eggert. */
  20
  21 #if HAVE_CONFIG_H
  22 # include <config.h>
  23 #endif
  24
  25 #if HAVE_INTTYPES_H
  26 # include <inttypes.h>
  27 #endif
  28
  29 #if HAVE_STDLIB_H
  30 # include <stdlib.h>
  31 #endif
  32
  33 #ifndef PARAMS
  34 # if defined PROTOTYPES || defined __STDC__
  35 #  define PARAMS(Args) Args
  36 # else
  37 #  define PARAMS(Args) ()
  38 # endif
  39 #endif
  40
  41 /* Verify a requirement at compile-time (unlike assert, which is runtime).  */
  42 #define verify(name, assertion) struct name { char a[(assertion) ? 1 : -1]; }
  43
  44 #ifdef UNSIGNED
  45 # ifndef HAVE_DECL_STRTOUL
  46 "this configure-time declaration test was not run"
  47 # endif
  48 # if !HAVE_DECL_STRTOUL
  49 unsigned long strtoul PARAMS ((char const *, char **, int));
  50 # endif
  51 # ifndef HAVE_DECL_STRTOULL
  52 "this configure-time declaration test was not run"
  53 # endif
  54 # if !HAVE_DECL_STRTOULL && HAVE_UNSIGNED_LONG_LONG
  55 unsigned long long strtoull PARAMS ((char const *, char **, int));
  56 # endif
  57
  58 #else
  59
  60 # ifndef HAVE_DECL_STRTOL
  61 "this configure-time declaration test was not run"
  62 # endif
  63 # if !HAVE_DECL_STRTOL
  64 long strtol PARAMS ((char const *, char **, int));
  65 # endif
  66 # ifndef HAVE_DECL_STRTOLL
  67 "this configure-time declaration test was not run"
  68 # endif
  69 # if !HAVE_DECL_STRTOLL && HAVE_LONG_LONG
  70 long long strtoll PARAMS ((char const *, char **, int));
  71 # endif
  72 #endif
  73
  74 #ifdef UNSIGNED
  75 # undef HAVE_LONG_LONG
  76 # define HAVE_LONG_LONG HAVE_UNSIGNED_LONG_LONG
  77 # define INT uintmax_t
  78 # define strtoimax strtoumax
  79 # define strtol strtoul
  80 # define strtoll strtoull
  81 #else
  82 # define INT intmax_t
  83 #endif
  84
  85 INT
  86 strtoimax (char const *ptr, char **endptr, int base)
  87 {
  88 #if HAVE_LONG_LONG
  89   verify (size_is_that_of_long_or_long_long,
  90           (sizeof (INT) == sizeof (long)
  91            || sizeof (INT) == sizeof (long long)));
  92
  93   if (sizeof (INT) != sizeof (long))
  94     return strtoll (ptr, endptr, base);
  95 #else
  96   verify (size_is_that_of_long,
  97           sizeof (INT) == sizeof (long));
  98 #endif
  99
 100   return strtol (ptr, endptr, base);
 101 }