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 */
num2str(unsigned long num,int maxlen,int base,int pow2,int unit_base)12 char *num2str(unsigned long 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, "%lu", 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, "%lu%s%s", num, postfix[post_index],
55 byte_postfix[byte_post_index]);
56 return buf;
57 }
58
59 sprintf(tmp, "%lu", 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, "%lu.%u%s%s", num, modulo, postfix[post_index],
76 byte_postfix[byte_post_index]);
77 return buf;
78 }
79