itoa.c revision 75584 
1/* Copyright (C) 1989, 1990, 1991, 1992, 2000 Free Software Foundation, Inc.
2     Written by James Clark (jjc@jclark.com)
3
4This file is part of groff.
5
6groff is free software; you can redistribute it and/or modify it under
7the terms of the GNU General Public License as published by the Free
8Software Foundation; either version 2, or (at your option) any later
9version.
10
11groff is distributed in the hope that it will be useful, but WITHOUT ANY
12WARRANTY; without even the implied warranty of MERCHANTABILITY or
13FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14for more details.
15
16You should have received a copy of the GNU General Public License along
17with groff; see the file COPYING.  If not, write to the Free Software
18Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
19
20#define INT_DIGITS 19		/* enough for 64 bit integer */
21
22char *i_to_a(i)
23     int i;
24{
25  /* Room for INT_DIGITS digits, - and '\0' */
26  static char buf[INT_DIGITS + 2];
27  char *p = buf + INT_DIGITS + 1;	/* points to terminating '\0' */
28  if (i >= 0) {
29    do {
30      *--p = '0' + (i % 10);
31      i /= 10;
32    } while (i != 0);
33    return p;
34  }
35  else {			/* i < 0 */
36    do {
37      *--p = '0' - (i % 10);
38      i /= 10;
39    } while (i != 0);
40    *--p = '-';
41  }
42  return p;
43}
44