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Diffstat (limited to 'src/lib/libc/stdlib/div.c')
-rw-r--r-- | src/lib/libc/stdlib/div.c | 72 |
1 files changed, 0 insertions, 72 deletions
diff --git a/src/lib/libc/stdlib/div.c b/src/lib/libc/stdlib/div.c deleted file mode 100644 index 5e6164f0bb..0000000000 --- a/src/lib/libc/stdlib/div.c +++ /dev/null | |||
@@ -1,72 +0,0 @@ | |||
1 | /* $OpenBSD: div.c,v 1.7 2022/12/27 17:10:06 jmc Exp $ */ | ||
2 | /* | ||
3 | * Copyright (c) 1990 Regents of the University of California. | ||
4 | * All rights reserved. | ||
5 | * | ||
6 | * This code is derived from software contributed to Berkeley by | ||
7 | * Chris Torek. | ||
8 | * | ||
9 | * Redistribution and use in source and binary forms, with or without | ||
10 | * modification, are permitted provided that the following conditions | ||
11 | * are met: | ||
12 | * 1. Redistributions of source code must retain the above copyright | ||
13 | * notice, this list of conditions and the following disclaimer. | ||
14 | * 2. Redistributions in binary form must reproduce the above copyright | ||
15 | * notice, this list of conditions and the following disclaimer in the | ||
16 | * documentation and/or other materials provided with the distribution. | ||
17 | * 3. Neither the name of the University nor the names of its contributors | ||
18 | * may be used to endorse or promote products derived from this software | ||
19 | * without specific prior written permission. | ||
20 | * | ||
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | ||
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | ||
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | ||
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | ||
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | ||
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | ||
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | ||
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | ||
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | ||
31 | * SUCH DAMAGE. | ||
32 | */ | ||
33 | |||
34 | #include <stdlib.h> /* div_t */ | ||
35 | |||
36 | div_t | ||
37 | div(int num, int denom) | ||
38 | { | ||
39 | div_t r; | ||
40 | |||
41 | r.quot = num / denom; | ||
42 | r.rem = num % denom; | ||
43 | /* | ||
44 | * The ANSI standard says that |r.quot| <= |n/d|, where | ||
45 | * n/d is to be computed in infinite precision. In other | ||
46 | * words, we should always truncate the quotient towards | ||
47 | * 0, never -infinity. | ||
48 | * | ||
49 | * Machine division and remainder may work either way when | ||
50 | * one or both of n or d is negative. If only one is | ||
51 | * negative and r.quot has been truncated towards -inf, | ||
52 | * r.rem will have the same sign as denom and the opposite | ||
53 | * sign of num; if both are negative and r.quot has been | ||
54 | * truncated towards -inf, r.rem will be positive (will | ||
55 | * have the opposite sign of num). These are considered | ||
56 | * `wrong'. | ||
57 | * | ||
58 | * If both are num and denom are positive, r will always | ||
59 | * be positive. | ||
60 | * | ||
61 | * This all boils down to: | ||
62 | * if num >= 0, but r.rem < 0, we got the wrong answer. | ||
63 | * In that case, to get the right answer, add 1 to r.quot and | ||
64 | * subtract denom from r.rem. | ||
65 | */ | ||
66 | if (num >= 0 && r.rem < 0) { | ||
67 | r.quot++; | ||
68 | r.rem -= denom; | ||
69 | } | ||
70 | return (r); | ||
71 | } | ||
72 | DEF_STRONG(div); | ||