gnu/dist/diffutils/lib/strtoimax.c

   1 /*      $NetBSD$        */
   2
   3 /* Convert string representation of a number into an intmax_t value.
   4
   5    Copyright (C) 1999, 2001 Free Software Foundation, Inc.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2, or (at your option)
  10    any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software Foundation,
  19    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  20
  21 /* Written by Paul Eggert. */
  22
  23 #if HAVE_CONFIG_H
  24 # include <config.h>
  25 #endif
  26
  27 #if HAVE_INTTYPES_H
  28 # include <inttypes.h>
  29 #endif
  30
  31 #if HAVE_STDLIB_H
  32 # include <stdlib.h>
  33 #endif
  34
  35 #ifndef PARAMS
  36 # if defined PROTOTYPES || defined __STDC__
  37 #  define PARAMS(Args) Args
  38 # else
  39 #  define PARAMS(Args) ()
  40 # endif
  41 #endif
  42
  43 /* Verify a requirement at compile-time (unlike assert, which is runtime).  */
  44 #define verify(name, assertion) struct name { char a[(assertion) ? 1 : -1]; }
  45
  46 #ifdef UNSIGNED
  47 # ifndef HAVE_DECL_STRTOUL
  48 "this configure-time declaration test was not run"
  49 # endif
  50 # if !HAVE_DECL_STRTOUL
  51 unsigned long strtoul PARAMS ((char const *, char **, int));
  52 # endif
  53 # ifndef HAVE_DECL_STRTOULL
  54 "this configure-time declaration test was not run"
  55 # endif
  56 # if !HAVE_DECL_STRTOULL && HAVE_UNSIGNED_LONG_LONG
  57 unsigned long long strtoull PARAMS ((char const *, char **, int));
  58 # endif
  59
  60 #else
  61
  62 # ifndef HAVE_DECL_STRTOL
  63 "this configure-time declaration test was not run"
  64 # endif
  65 # if !HAVE_DECL_STRTOL
  66 long strtol PARAMS ((char const *, char **, int));
  67 # endif
  68 # ifndef HAVE_DECL_STRTOLL
  69 "this configure-time declaration test was not run"
  70 # endif
  71 # if !HAVE_DECL_STRTOLL && HAVE_UNSIGNED_LONG_LONG
  72 long long strtoll PARAMS ((char const *, char **, int));
  73 # endif
  74 #endif
  75
  76 #ifdef UNSIGNED
  77 # undef HAVE_LONG_LONG
  78 # define HAVE_LONG_LONG HAVE_UNSIGNED_LONG_LONG
  79 # define INT uintmax_t
  80 # define strtoimax strtoumax
  81 # define strtol strtoul
  82 # define strtoll strtoull
  83 #else
  84 # define INT intmax_t
  85 #endif
  86
  87 INT
  88 strtoimax (char const *ptr, char **endptr, int base)
  89 {
  90 #if HAVE_LONG_LONG
  91   verify (size_is_that_of_long_or_long_long,
  92           (sizeof (INT) == sizeof (long)
  93            || sizeof (INT) == sizeof (long long)));
  94
  95   if (sizeof (INT) != sizeof (long))
  96     return strtoll (ptr, endptr, base);
  97 #else
  98   verify (size_is_that_of_long,
  99           sizeof (INT) == sizeof (long));
 100 #endif
 101
 102   return strtol (ptr, endptr, base);
 103 }