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1 | /* Round float value to long int. |
2 | Copyright (C) 1997 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
b9b49b44 UD |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
b9b49b44 | 14 | |
41bdb6e2 AJ |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
b9b49b44 UD |
19 | |
20 | #include <math.h> | |
21 | ||
22 | /* I think that what this routine is supposed to do is round a value | |
23 | to the nearest integer, with values exactly on the boundary rounded | |
24 | away from zero. */ | |
25 | /* This routine relies on (long int)x, when x is out of range of a long int, | |
26 | clipping to MAX_LONG or MIN_LONG. */ | |
27 | ||
28 | long int | |
29 | __lroundf (float x) | |
30 | { | |
31 | float xrf; | |
32 | long int xr; | |
33 | xr = (long int) x; | |
34 | xrf = (float) xr; | |
35 | if (x >= 0.0) | |
36 | if (x - xrf >= 0.5 && x - xrf < 1.0 && x+1 > 0) | |
37 | return x+1; | |
38 | else | |
39 | return x; | |
40 | else | |
41 | if (xrf - x >= 0.5 && xrf - x < 1.0 && x-1 < 0) | |
42 | return x-1; | |
43 | else | |
44 | return x; | |
45 | } | |
46 | weak_alias (__lroundf, lroundf) |