dtoab.c (1374B)
1 /* -*-comment-start: "//";comment-end:""-*- 2 * GNU Mes --- Maxwell Equations of Software 3 * Copyright © 2016,2017,2018,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org> 4 * 5 * This file is part of GNU Mes. 6 * 7 * GNU Mes is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 3 of the License, or (at 10 * your option) any later version. 11 * 12 * GNU Mes is distributed in the hope that it will be useful, but 13 * WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with GNU Mes. If not, see <http://www.gnu.org/licenses/>. 19 */ 20 21 #include <mes/lib.h> 22 #include <limits.h> 23 #include <string.h> 24 25 char * 26 dtoab (double d, int base, int signed_p) 27 { 28 static char dtoa_buf[40]; 29 long i = (long) d; 30 char *p = ntoab (i, base, signed_p); 31 strcpy (dtoa_buf, p); 32 long f = (d - (double) i) * (double) 100000000; 33 if (f) 34 { 35 if (f < 0) 36 f = -f; 37 strcat (dtoa_buf, "."); 38 p = ntoab (f, base, 1); 39 strcat (dtoa_buf, p); 40 p = strchr (dtoa_buf, 0); 41 p--; 42 while (*p && *p == '0') 43 *p-- = 0; 44 } 45 return dtoa_buf; 46 }