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33 lines
1.0 KiB
C
33 lines
1.0 KiB
C
#include "utils.h"
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// https://stackoverflow.com/questions/23191203/convert-float-to-string-without-sprintf
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char *float_to_char(float x, char *p)
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{
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char *s = p + FLOAT_CHAR_BUFF_SIZE; // go to end of buffer
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uint16_t decimals; // variable to store the decimals
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int units; // variable to store the units (part to left of decimal place)
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if (x < 0)
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{ // take care of negative numbers
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decimals = (int)(x * -100) % 100; // make 1000 for 3 decimals etc.
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units = (int)(-1 * x);
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}
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else
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{ // positive numbers
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decimals = (int)(x * 100) % 100;
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units = (int)x;
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}
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*--s = (decimals % 10) + '0';
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decimals /= 10; // repeat for as many decimal places as you need
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*--s = (decimals % 10) + '0';
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*--s = '.';
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while (units > 0)
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{
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*--s = (units % 10) + '0';
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units /= 10;
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}
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if (x < 0)
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*--s = '-'; // unary minus sign for negative numbers
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return s;
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} |