lib/strtoimax.c

   1 /* Convert string representation of a number into an intmax_t value.
   2    Copyright 1999, 2001 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 /* Verify a requirement at compile-time (unlike assert, which is runtime).  */
  41 #define verify(name, assertion) struct name { char a[(assertion) ? 1 : -1]; }
  42
  43 #ifdef UNSIGNED
  44 # ifndef HAVE_DECL_STRTOUL
  45 "this configure-time declaration test was not run"
  46 # endif
  47 # if !HAVE_DECL_STRTOUL
  48 unsigned long strtoul PARAMS ((char const *, char **, int));
  49 # endif
  50 # ifndef HAVE_DECL_STRTOULL
  51 "this configure-time declaration test was not run"
  52 # endif
  53 # if !HAVE_DECL_STRTOULL && HAVE_UNSIGNED_LONG_LONG
  54 unsigned long long strtoull PARAMS ((char const *, char **, int));
  55 # endif
  56
  57 #else
  58
  59 # ifndef HAVE_DECL_STRTOL
  60 "this configure-time declaration test was not run"
  61 # endif
  62 # if !HAVE_DECL_STRTOL
  63 long strtol PARAMS ((char const *, char **, int));
  64 # endif
  65 # ifndef HAVE_DECL_STRTOLL
  66 "this configure-time declaration test was not run"
  67 # endif
  68 # if !HAVE_DECL_STRTOLL && HAVE_UNSIGNED_LONG_LONG
  69 long long strtoll PARAMS ((char const *, char **, int));
  70 # endif
  71 #endif
  72
  73 #ifdef UNSIGNED
  74 # undef HAVE_LONG_LONG
  75 # define HAVE_LONG_LONG HAVE_UNSIGNED_LONG_LONG
  76 # define INT uintmax_t
  77 # define strtoimax strtoumax
  78 # define strtol strtoul
  79 # define strtoll strtoull
  80 #else
  81 # define INT intmax_t
  82 #endif
  83
  84 INT
  85 strtoimax (char const *ptr, char **endptr, int base)
  86 {
  87 #if HAVE_LONG_LONG
  88   verify (size_is_that_of_long_or_long_long,
  89           (sizeof (INT) == sizeof (long)
  90            || sizeof (INT) == sizeof (long long)));
  91
  92   if (sizeof (INT) != sizeof (long))
  93     return strtoll (ptr, endptr, base);
  94 #else
  95   verify (size_is_that_of_long,
  96           sizeof (INT) == sizeof (long));
  97 #endif
  98
  99   return strtol (ptr, endptr, base);
 100 }