itoa.c revision 104862 
1/* Copyright (C) 1989, 1990, 1991, 1992, 2000, 2002
2     Free Software Foundation, Inc.
3     Written by James Clark (jjc@jclark.com)
4
5This file is part of groff.
6
7groff is free software; you can redistribute it and/or modify it under
8the terms of the GNU General Public License as published by the Free
9Software Foundation; either version 2, or (at your option) any later
10version.
11
12groff is distributed in the hope that it will be useful, but WITHOUT ANY
13WARRANTY; without even the implied warranty of MERCHANTABILITY or
14FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
15for more details.
16
17You should have received a copy of the GNU General Public License along
18with groff; see the file COPYING.  If not, write to the Free Software
19Foundation, 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
24char *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
47char *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}
59