gnu/usr.bin/groff/libgroff/itoa.cc

   1 /*-
   2  * This code is derived from software copyrighted by the Free Software
   3  * Foundation.
   4  *
   5  * Modified 1991 by Donn Seeley at UUNET Technologies, Inc.
   6  */
   7
   8 #ifndef lint
   9 static char sccsid[] = "@(#)itoa.cc     6.3 (Berkeley) 5/8/91";
  10 #endif /* not lint */
  11
  12 /* Copyright (C) 1989, 1990 Free Software Foundation, Inc.
  13      Written by James Clark (jjc@jclark.uucp)
  14
  15 This file is part of groff.
  16
  17 groff is free software; you can redistribute it and/or modify it under
  18 the terms of the GNU General Public License as published by the Free
  19 Software Foundation; either version 1, or (at your option) any later
  20 version.
  21
  22 groff is distributed in the hope that it will be useful, but WITHOUT ANY
  23 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  24 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  25 for more details.
  26
  27 You should have received a copy of the GNU General Public License along
  28 with groff; see the file LICENSE.  If not, write to the Free Software
  29 Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
  30
  31 #include "lib.h"
  32
  33 const char *itoa(int i)
  34 {
  35   /* Room for 10 digits, - and '\0' */
  36   static char buf[INT_DIGITS + 2];
  37   char *p = buf + INT_DIGITS + 1;       /* points to terminating '\0' */
  38   if (i >= 0) {
  39     do {
  40       *--p = '0' + (i % 10);
  41       i /= 10;
  42     } while (i != 0);
  43     return p;
  44   }
  45   else {                        /* i < 0 */
  46     do {
  47       *--p = '0' - (i % 10);
  48       i /= 10;
  49     } while (i != 0);
  50     *--p = '-';
  51   }
  52   return p;
  53 }