78 lines
1.6 KiB
C
78 lines
1.6 KiB
C
#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "../fio.h"
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#define ARRAY_LENGTH(arr) sizeof(arr) / sizeof((arr)[0])
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/*
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* Cheesy number->string conversion, complete with carry rounding error.
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*/
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char *num2str(uint64_t num, int maxlen, int base, int pow2, int unit_base)
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{
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const char *postfix[] = { "", "K", "M", "G", "P", "E" };
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const char *byte_postfix[] = { "", "B", "bit" };
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const unsigned int thousand[] = { 1000, 1024 };
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unsigned int modulo, decimals;
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int byte_post_index = 0, post_index, carry = 0;
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char tmp[32];
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char *buf;
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buf = malloc(128);
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for (post_index = 0; base > 1; post_index++)
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base /= thousand[!!pow2];
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switch (unit_base) {
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case 1:
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byte_post_index = 2;
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num *= 8;
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break;
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case 8:
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byte_post_index = 1;
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break;
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}
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modulo = -1U;
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while (post_index < sizeof(postfix)) {
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sprintf(tmp, "%llu", (unsigned long long) num);
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if (strlen(tmp) <= maxlen)
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break;
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modulo = num % thousand[!!pow2];
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num /= thousand[!!pow2];
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carry = modulo >= thousand[!!pow2] / 2;
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post_index++;
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}
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if (modulo == -1U) {
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done:
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if (post_index >= ARRAY_LENGTH(postfix))
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post_index = 0;
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sprintf(buf, "%llu%s%s", (unsigned long long) num,
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postfix[post_index], byte_postfix[byte_post_index]);
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return buf;
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}
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sprintf(tmp, "%llu", (unsigned long long) num);
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decimals = maxlen - strlen(tmp);
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if (decimals <= 1) {
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if (carry)
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num++;
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goto done;
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}
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do {
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sprintf(tmp, "%u", modulo);
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if (strlen(tmp) <= decimals - 1)
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break;
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modulo = (modulo + 9) / 10;
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} while (1);
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sprintf(buf, "%llu.%u%s%s", (unsigned long long) num, modulo,
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postfix[post_index], byte_postfix[byte_post_index]);
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return buf;
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}
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