contrib/groff-1.19/src/libs/libgroff/itoa.c

   1 /* Copyright (C) 1989, 1990, 1991, 1992, 2000, 2002, 2004
   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, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA. */
  20
  21 #define INT_DIGITS 19           /* enough for 64 bit integer */
  22 #define UINT_DIGITS 20
  23
  24 #ifdef __cplusplus
  25 extern "C" {
  26 #endif
  27
  28 char *i_to_a(int i)
  29 {
  30   /* Room for INT_DIGITS digits, - and '\0' */
  31   static char buf[INT_DIGITS + 2];
  32   char *p = buf + INT_DIGITS + 1;       /* points to terminating '\0' */
  33   if (i >= 0) {
  34     do {
  35       *--p = '0' + (i % 10);
  36       i /= 10;
  37     } while (i != 0);
  38     return p;
  39   }
  40   else {                        /* i < 0 */
  41     do {
  42       *--p = '0' - (i % 10);
  43       i /= 10;
  44     } while (i != 0);
  45     *--p = '-';
  46   }
  47   return p;
  48 }
  49
  50 char *ui_to_a(unsigned int i)
  51 {
  52   /* Room for UINT_DIGITS digits and '\0' */
  53   static char buf[UINT_DIGITS + 1];
  54   char *p = buf + UINT_DIGITS;  /* points to terminating '\0' */
  55   do {
  56     *--p = '0' + (i % 10);
  57     i /= 10;
  58   } while (i != 0);
  59   return p;
  60 }
  61
  62 #ifdef __cplusplus
  63 }
  64 #endif