Commit | Line | Data |
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1ec3d69b JA |
1 | #include <stdlib.h> |
2 | #include <stdio.h> | |
3 | #include <string.h> | |
4 | ||
10aa136b JA |
5 | #include "../fio.h" |
6 | ||
d694a6a7 RE |
7 | /** |
8 | * num2str() - Cheesy number->string conversion, complete with carry rounding error. | |
9 | * @num: quantity (e.g., number of blocks, bytes or bits) | |
10 | * @maxlen: max number of digits in the output string (not counting prefix and units) | |
11 | * @base: multiplier for num (e.g., if num represents Ki, use 1024) | |
12 | * @pow2: select unit prefix - 0=power-of-10 decimal SI, nonzero=power-of-2 binary IEC | |
13 | * @units: select units - N2S_* macros defined in fio.h | |
14 | * @returns a malloc'd buffer containing "number[<unit prefix>][<units>]" | |
1ec3d69b | 15 | */ |
d694a6a7 | 16 | char *num2str(uint64_t num, int maxlen, int base, int pow2, int units) |
1ec3d69b | 17 | { |
d694a6a7 RE |
18 | const char *sistr[] = { "", "k", "M", "G", "T", "P" }; |
19 | const char *iecstr[] = { "", "Ki", "Mi", "Gi", "Ti", "Pi" }; | |
20 | const char **unitprefix; | |
21 | const char *unitstr[] = { "", "/s", "B", "bit", "B/s", "bit/s" }; | |
73798eb2 | 22 | const unsigned int thousand[] = { 1000, 1024 }; |
1ec3d69b | 23 | unsigned int modulo, decimals; |
d694a6a7 | 24 | int unit_index = 0, post_index, carry = 0; |
05463816 | 25 | char tmp[32]; |
1ec3d69b JA |
26 | char *buf; |
27 | ||
d694a6a7 RE |
28 | compiletime_assert(sizeof(sistr) == sizeof(iecstr), "unit prefix arrays must be identical sizes"); |
29 | ||
1ec3d69b | 30 | buf = malloc(128); |
d694a6a7 RE |
31 | if (!buf) |
32 | return NULL; | |
33 | ||
34 | if (pow2) | |
35 | unitprefix = iecstr; | |
36 | else | |
37 | unitprefix = sistr; | |
1ec3d69b JA |
38 | |
39 | for (post_index = 0; base > 1; post_index++) | |
40 | base /= thousand[!!pow2]; | |
41 | ||
d694a6a7 RE |
42 | switch (units) { |
43 | case N2S_PERSEC: | |
44 | unit_index = 1; | |
45 | break; | |
46 | case N2S_BYTE: | |
47 | unit_index = 2; | |
48 | break; | |
49 | case N2S_BIT: | |
50 | unit_index = 3; | |
73798eb2 SN |
51 | num *= 8; |
52 | break; | |
d694a6a7 RE |
53 | case N2S_BYTEPERSEC: |
54 | unit_index = 4; | |
55 | break; | |
56 | case N2S_BITPERSEC: | |
57 | unit_index = 5; | |
58 | num *= 8; | |
73798eb2 SN |
59 | break; |
60 | } | |
61 | ||
1ec3d69b | 62 | modulo = -1U; |
d694a6a7 | 63 | while (post_index < sizeof(sistr)) { |
ca09be4b | 64 | sprintf(tmp, "%llu", (unsigned long long) num); |
1ec3d69b JA |
65 | if (strlen(tmp) <= maxlen) |
66 | break; | |
67 | ||
68 | modulo = num % thousand[!!pow2]; | |
69 | num /= thousand[!!pow2]; | |
05463816 | 70 | carry = modulo >= thousand[!!pow2] / 2; |
1ec3d69b JA |
71 | post_index++; |
72 | } | |
73 | ||
74 | if (modulo == -1U) { | |
75 | done: | |
b920b29b | 76 | if (post_index >= ARRAY_SIZE(sistr)) |
b7e147d1 JA |
77 | post_index = 0; |
78 | ||
ca09be4b | 79 | sprintf(buf, "%llu%s%s", (unsigned long long) num, |
d694a6a7 | 80 | unitprefix[post_index], unitstr[unit_index]); |
1ec3d69b JA |
81 | return buf; |
82 | } | |
83 | ||
ca09be4b | 84 | sprintf(tmp, "%llu", (unsigned long long) num); |
1ec3d69b | 85 | decimals = maxlen - strlen(tmp); |
05463816 JA |
86 | if (decimals <= 1) { |
87 | if (carry) | |
88 | num++; | |
1ec3d69b | 89 | goto done; |
05463816 JA |
90 | } |
91 | ||
92 | do { | |
93 | sprintf(tmp, "%u", modulo); | |
94 | if (strlen(tmp) <= decimals - 1) | |
95 | break; | |
96 | ||
97 | modulo = (modulo + 9) / 10; | |
98 | } while (1); | |
1ec3d69b | 99 | |
ca09be4b | 100 | sprintf(buf, "%llu.%u%s%s", (unsigned long long) num, modulo, |
d694a6a7 | 101 | unitprefix[post_index], unitstr[unit_index]); |
1ec3d69b JA |
102 | return buf; |
103 | } |