1 #include <stdlib.h> 2 #include <stdio.h> 3 #include <string.h> 4 5 #include "../fio.h" 6 7 #define ARRAY_LENGTH(arr) sizeof(arr) / sizeof((arr)[0]) 8 9 /* 10 * Cheesy number->string conversion, complete with carry rounding error. 11 */ 12 char *num2str(uint64_t num, int maxlen, int base, int pow2, int unit_base) 13 { 14 const char *postfix[] = { "", "K", "M", "G", "P", "E" }; 15 const char *byte_postfix[] = { "", "B", "bit" }; 16 const unsigned int thousand[] = { 1000, 1024 }; 17 unsigned int modulo, decimals; 18 int byte_post_index = 0, post_index, carry = 0; 19 char tmp[32]; 20 char *buf; 21 22 buf = malloc(128); 23 24 for (post_index = 0; base > 1; post_index++) 25 base /= thousand[!!pow2]; 26 27 switch (unit_base) { 28 case 1: 29 byte_post_index = 2; 30 num *= 8; 31 break; 32 case 8: 33 byte_post_index = 1; 34 break; 35 } 36 37 modulo = -1U; 38 while (post_index < sizeof(postfix)) { 39 sprintf(tmp, "%llu", (unsigned long long) num); 40 if (strlen(tmp) <= maxlen) 41 break; 42 43 modulo = num % thousand[!!pow2]; 44 num /= thousand[!!pow2]; 45 carry = modulo >= thousand[!!pow2] / 2; 46 post_index++; 47 } 48 49 if (modulo == -1U) { 50 done: 51 if (post_index >= ARRAY_LENGTH(postfix)) 52 post_index = 0; 53 54 sprintf(buf, "%llu%s%s", (unsigned long long) num, 55 postfix[post_index], byte_postfix[byte_post_index]); 56 return buf; 57 } 58 59 sprintf(tmp, "%llu", (unsigned long long) num); 60 decimals = maxlen - strlen(tmp); 61 if (decimals <= 1) { 62 if (carry) 63 num++; 64 goto done; 65 } 66 67 do { 68 sprintf(tmp, "%u", modulo); 69 if (strlen(tmp) <= decimals - 1) 70 break; 71 72 modulo = (modulo + 9) / 10; 73 } while (1); 74 75 sprintf(buf, "%llu.%u%s%s", (unsigned long long) num, modulo, 76 postfix[post_index], byte_postfix[byte_post_index]); 77 return buf; 78 } 79
