contrib/diffutils/lib/anytostr.c

   1 /* anytostr.c -- convert integers to printable strings
   2
   3    Copyright (C) 2001, 2006, 2008-2013 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 3 of the License, or
   8    (at your option) 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, see <http://www.gnu.org/licenses/>.  */
  17
  18 /* Written by Paul Eggert */
  19
  20 /* Tell gcc not to warn about the (i < 0) test, below.  */
  21 #if (__GNUC__ == 4 && 3 <= __GNUC_MINOR__) || 4 < __GNUC__
  22 # pragma GCC diagnostic ignored "-Wtype-limits"
  23 #endif
  24
  25 #include <config.h>
  26
  27 #include "inttostr.h"
  28
  29 /* Convert I to a printable string in BUF, which must be at least
  30    INT_BUFSIZE_BOUND (INTTYPE) bytes long.  Return the address of the
  31    printable string, which need not start at BUF.  */
  32
  33 char * __attribute_warn_unused_result__
  34 anytostr (inttype i, char *buf)
  35 {
  36   char *p = buf + INT_STRLEN_BOUND (inttype);
  37   *p = 0;
  38
  39   if (i < 0)
  40     {
  41       do
  42         *--p = '0' - i % 10;
  43       while ((i /= 10) != 0);
  44
  45       *--p = '-';
  46     }
  47   else
  48     {
  49       do
  50         *--p = '0' + i % 10;
  51       while ((i /= 10) != 0);
  52     }
  53
  54   return p;
  55 }