projects / fio.git / blame
| Commit | Line | Data |
|---|---|---|
| 1ec3d69b JA |
1 | #include <stdlib.h> |
| 2 | #include <stdio.h> | |
| 3 | #include <string.h> | |
| 4 | ||
| 5 | /* | |
| 6 | * Cheesy number->string conversion, complete with carry rounding error. | |
| 7 | */ | |
| 8 | char *num2str(unsigned long num, int maxlen, int base, int pow2) | |
| 9 | { | |
| 10 | char postfix[] = { ' ', 'K', 'M', 'G', 'P', 'E' }; | |
| 11 | unsigned int thousand[] = { 1000, 1024 }; | |
| 12 | unsigned int modulo, decimals; | |
| 05463816 JA |
13 | int post_index, carry = 0; |
| 14 | char tmp[32]; | |
| 1ec3d69b JA |
15 | char *buf; |
| 16 | ||
| 17 | buf = malloc(128); | |
| 18 | ||
| 19 | for (post_index = 0; base > 1; post_index++) | |
| 20 | base /= thousand[!!pow2]; | |
| 21 | ||
| 22 | modulo = -1U; | |
| 23 | while (post_index < sizeof(postfix)) { | |
| 24 | sprintf(tmp, "%lu", num); | |
| 25 | if (strlen(tmp) <= maxlen) | |
| 26 | break; | |
| 27 | ||
| 28 | modulo = num % thousand[!!pow2]; | |
| 29 | num /= thousand[!!pow2]; | |
| 05463816 | 30 | carry = modulo >= thousand[!!pow2] / 2; |
| 1ec3d69b JA |
31 | post_index++; |
| 32 | } | |
| 33 | ||
| 34 | if (modulo == -1U) { | |
| 35 | done: | |
| 36 | sprintf(buf, "%lu%c", num, postfix[post_index]); | |
| 37 | return buf; | |
| 38 | } | |
| 39 | ||
| 40 | sprintf(tmp, "%lu", num); | |
| 41 | decimals = maxlen - strlen(tmp); | |
| 05463816 JA |
42 | if (decimals <= 1) { |
| 43 | if (carry) | |
| 44 | num++; | |
| 1ec3d69b | 45 | goto done; |
| 05463816 JA |
46 | } |
| 47 | ||
| 48 | do { | |
| 49 | sprintf(tmp, "%u", modulo); | |
| 50 | if (strlen(tmp) <= decimals - 1) | |
| 51 | break; | |
| 52 | ||
| 53 | modulo = (modulo + 9) / 10; | |
| 54 | } while (1); | |
| 1ec3d69b | 55 | |
| 05463816 | 56 | sprintf(buf, "%lu.%u%c", num, modulo, postfix[post_index]); |
| 1ec3d69b JA |
57 | return buf; |
| 58 | } |