47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
#include <cstdio>
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#include <cmath>
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#include "helpers.h"
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char * strip_eol (char * str) {
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char * ptr = str;
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for (;;) {
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const char c = * ptr;
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if (c == '\0') break;
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else if (c == '\r') * ptr = '\0';
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else if (c == '\n') * ptr = '\0';
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ptr++;
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}
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return str;
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}
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std::string ing_fmt (const double par, const unsigned dnum) {
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const char * suffixes [] = {"a", "f", "p", "n", "μ", "m", " ", "k", "M", "G", "T", "P", "E"};
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bool sign = false;
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double value = par;
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if (par < 0.0) {
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value = - par;
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sign = true;
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}
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if (value < 1.0e-18) return std::string ("0");
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if (value > 1.0e+18) return std::string ("hafo");
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const double dlog = log10 (value) + 18.0;
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double fractional, integer;
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fractional = modf (dlog, & integer);
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const double mult = pow (10.0, double (dnum - 1));
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double avgf = pow (10.0, fractional); // do mezí 1.0 až 9.9999...
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avgf *= mult;
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avgf = round (avgf); // a teď zaokrouhli
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avgf /= mult;
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div_t dt = div (int(integer), 3);
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avgf *= pow (10.0, double (dt.rem));
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// printf("%g:%g (%f) [%d:%d]{%s}\n", integer, fractional, avgf, dt.quot, dt.rem, suffixes[dt.quot]);
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const unsigned buflen = 64;
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char buffer [buflen];
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const int r = snprintf(buffer, buflen, "%g%s", avgf, suffixes [dt.quot]);
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buffer [r] = '\0';
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std::string result (buffer, r);
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if (sign) result = std::string("-") + result;
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return result;
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}
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