src/libs/libgroff/itoa.c

   1 /* Copyright (C) 1989, 1990, 1991, 1992, 2000, 2002
   2      Free Software Foundation, Inc.
   3      Written by James Clark (jjc@jclark.com)
   4
   5 This file is part of groff.
   6
   7 groff is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 groff is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License along
  18 with groff; see the file COPYING.  If not, write to the Free Software
  19 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
  20
  21 #define INT_DIGITS 19           /* enough for 64 bit integer */
  22 #define UINT_DIGITS 20
  23
  24 char *i_to_a(i)
  25      int i;
  26 {
  27   /* Room for INT_DIGITS digits, - and '\0' */
  28   static char buf[INT_DIGITS + 2];
  29   char *p = buf + INT_DIGITS + 1;       /* points to terminating '\0' */
  30   if (i >= 0) {
  31     do {
  32       *--p = '0' + (i % 10);
  33       i /= 10;
  34     } while (i != 0);
  35     return p;
  36   }
  37   else {                        /* i < 0 */
  38     do {
  39       *--p = '0' - (i % 10);
  40       i /= 10;
  41     } while (i != 0);
  42     *--p = '-';
  43   }
  44   return p;
  45 }
  46
  47 char *ui_to_a(i)
  48      unsigned int i;
  49 {
  50   /* Room for UINT_DIGITS digits and '\0' */
  51   static char buf[UINT_DIGITS + 1];
  52   char *p = buf + UINT_DIGITS;  /* points to terminating '\0' */
  53   do {
  54     *--p = '0' + (i % 10);
  55     i /= 10;
  56   } while (i != 0);
  57   return p;
  58 }