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Source at commit b05a5adf03613de371c77c3235f7d970d7cd0c71 created 13 years 1 month ago. By Lars-Peter Clausen, NAND: Optimize reading the eec data for the JZ4740 (evil hack) | |
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1 | /* |
2 | * Helpers for formatting and printing strings |
3 | * |
4 | * Copyright 31 August 2008 James Bottomley |
5 | */ |
6 | #include <linux/kernel.h> |
7 | #include <linux/math64.h> |
8 | #include <linux/module.h> |
9 | #include <linux/string_helpers.h> |
10 | |
11 | /** |
12 | * string_get_size - get the size in the specified units |
13 | * @size: The size to be converted |
14 | * @units: units to use (powers of 1000 or 1024) |
15 | * @buf: buffer to format to |
16 | * @len: length of buffer |
17 | * |
18 | * This function returns a string formatted to 3 significant figures |
19 | * giving the size in the required units. Returns 0 on success or |
20 | * error on failure. @buf is always zero terminated. |
21 | * |
22 | */ |
23 | int string_get_size(u64 size, const enum string_size_units units, |
24 | char *buf, int len) |
25 | { |
26 | const char *units_10[] = { "B", "kB", "MB", "GB", "TB", "PB", |
27 | "EB", "ZB", "YB", NULL}; |
28 | const char *units_2[] = {"B", "KiB", "MiB", "GiB", "TiB", "PiB", |
29 | "EiB", "ZiB", "YiB", NULL }; |
30 | const char **units_str[] = { |
31 | [STRING_UNITS_10] = units_10, |
32 | [STRING_UNITS_2] = units_2, |
33 | }; |
34 | const unsigned int divisor[] = { |
35 | [STRING_UNITS_10] = 1000, |
36 | [STRING_UNITS_2] = 1024, |
37 | }; |
38 | int i, j; |
39 | u64 remainder = 0, sf_cap; |
40 | char tmp[8]; |
41 | |
42 | tmp[0] = '\0'; |
43 | i = 0; |
44 | if (size >= divisor[units]) { |
45 | while (size >= divisor[units] && units_str[units][i]) { |
46 | remainder = do_div(size, divisor[units]); |
47 | i++; |
48 | } |
49 | |
50 | sf_cap = size; |
51 | for (j = 0; sf_cap*10 < 1000; j++) |
52 | sf_cap *= 10; |
53 | |
54 | if (j) { |
55 | remainder *= 1000; |
56 | do_div(remainder, divisor[units]); |
57 | snprintf(tmp, sizeof(tmp), ".%03lld", |
58 | (unsigned long long)remainder); |
59 | tmp[j+1] = '\0'; |
60 | } |
61 | } |
62 | |
63 | snprintf(buf, len, "%lld%s %s", (unsigned long long)size, |
64 | tmp, units_str[units][i]); |
65 | |
66 | return 0; |
67 | } |
68 | EXPORT_SYMBOL(string_get_size); |
69 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9