lib/inttostr.h

   1 /* inttostr.h -- convert integers to printable strings
   2
   3    Copyright (C) 2001, 2002, 2003 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_LIMITS_H
  30 # include <limits.h>
  31 #endif
  32 #ifndef CHAR_BIT
  33 # define CHAR_BIT 8
  34 #endif
  35
  36 #if HAVE_SYS_TYPES_H
  37 # include <sys/types.h>
  38 #endif
  39
  40 /* Upper bound on the string length of an integer converted to string.
  41    302 / 1000 is ceil (log10 (2.0)).  Subtract 1 for the sign bit;
  42    add 1 for integer division truncation; add 1 more for a minus sign.  */
  43 #define INT_STRLEN_BOUND(t) ((sizeof (t) * CHAR_BIT - 1) * 302 / 1000 + 2)
  44
  45 #define INT_BUFSIZE_BOUND(t) (INT_STRLEN_BOUND (t) + 1)
  46
  47 char *offtostr (off_t, char *);
  48 char *imaxtostr (intmax_t, char *);
  49 char *umaxtostr (uintmax_t, char *);