1 /* Copyright (C) 1989-2014 Free Software Foundation, Inc.
2 Written by James Clark (jjc@jclark.com)
4 This file is part of groff.
6 groff is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 groff is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 #define INT_DIGITS 19 /* enough for 64-bit integer */
25 char *if_to_a(int i, int decimal_point)
27 /* room for a -, INT_DIGITS digits, a decimal point, and a terminating '\0' */
28 static char buf[INT_DIGITS + 3];
29 char *p = buf + INT_DIGITS + 2;
31 buf[INT_DIGITS + 2] = '\0';
32 /* assert(decimal_point <= INT_DIGITS); */
35 *--p = '0' + (i % 10);
37 if (++point == decimal_point)
39 } while (i != 0 || point < decimal_point);
43 *--p = '0' - (i % 10);
45 if (++point == decimal_point)
47 } while (i != 0 || point < decimal_point);
50 if (decimal_point > 0) {
52 /* there must be a dot, so this will terminate */
53 for (q = buf + INT_DIGITS + 2; q[-1] == '0'; --q)