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buffer-lcm.c

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1/* buffer-lcm.c - compute a good buffer size for dealing with two files-
2-
3 Copyright (C) 2002-2018 Free Software Foundation, Inc.-
4-
5 This program is free software: you can redistribute it and/or modify-
6 it under the terms of the GNU General Public License as published by-
7 the Free Software Foundation, either version 3 of the License, or-
8 (at your option) any later version.-
9-
10 This program 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-
13 GNU General Public License for more details.-
14-
15 You should have received a copy of the GNU General Public License-
16 along with this program. If not, see <https://www.gnu.org/licenses/>. */-
17-
18/* Written by Paul Eggert. */-
19-
20#include <config.h>-
21#include "buffer-lcm.h"-
22-
23/* Return a buffer size suitable for doing I/O with files whose block-
24 sizes are A and B. However, never return a value greater than-
25 LCM_MAX. */-
26-
27size_t-
28buffer_lcm (size_t a, size_t b, size_t lcm_max)-
29{-
30 size_t size;-
31-
32 /* Use reasonable values if buffer sizes are zero. */-
33 if (!a)
!aDescription
TRUEnever evaluated
FALSEevaluated 4371 times by 3 tests
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34 size = b ? b : 8 * 1024;
never executed: size = b ? b : 8 * 1024;
bDescription
TRUEnever evaluated
FALSEnever evaluated
0
35 else-
36 {-
37 if (b)
bDescription
TRUEevaluated 4371 times by 3 tests
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FALSEnever evaluated
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38 {-
39 /* Return lcm (A, B) if it is in range; otherwise, fall back-
40 on A. */-
41-
42 size_t lcm, m, n, q, r;-
43-
44 /* N = gcd (A, B). */-
45 for (m = a, n = b; (r = m % n) != 0; m = n, n = r)
(r = m % n) != 0Description
TRUEnever evaluated
FALSEevaluated 4371 times by 3 tests
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46 continue;
never executed: continue;
0
47-
48 /* LCM = lcm (A, B), if in range. */-
49 q = a / n;-
50 lcm = q * b;-
51 if (lcm <= lcm_max && lcm / b == q)
lcm <= lcm_maxDescription
TRUEevaluated 4371 times by 3 tests
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FALSEnever evaluated
lcm / b == qDescription
TRUEevaluated 4371 times by 3 tests
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FALSEnever evaluated
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52 return lcm;
executed 4371 times by 3 tests: return lcm;
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53 }
never executed: end of block
0
54-
55 size = a;-
56 }
never executed: end of block
0
57-
58 return size <= lcm_max ? size : lcm_max;
never executed: return size <= lcm_max ? size : lcm_max;
0
59}-
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