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Update the eng() function. 

Allow outputting bytes in multiples of 1024.
Reformatting of file.
This commit is contained in:
Holger Vogt 2026-04-28 11:49:13 +02:00
parent b00d8daf58
commit 2c461c4441
1 changed files with 63 additions and 48 deletions
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111
src/misc/engnotation.c
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@ -13,59 +13,74 @@
/* Print a floating-point number in engineering notation.
Return string needs to be freed by the caller after its use.
numeric selects e3, e6, e9 etc. or k, M, G etc. */
char *eng(double value, int digits, int numeric)
numeric selects e3, e6, e9 etc. or k, M, G etc.
If flag bytes is set true, numeric is overwritten, bytes
in multiples of 1024 are issued using k, M, G, T, P. */
char *eng(double value, int digits, bool numeric, bool bytes)
{
static char *prefix[] = {
"y", "z", "a", "f", "p", "n", "u", "m", "",
"k", "M", "G", "T", "P", "E", "Z", "Y"
};
static char *prefix[] = {
"y", "z", "a", "f", "p", "n", "u", "m", "",
"k", "M", "G", "T", "P", "E", "Z", "Y"
};
#define PREFIX_END (PREFIX_START+\
(int)((sizeof(prefix)/sizeof(char *)-1)*3))
double display, fract;
int expof10;
char *result, *sign;
if(value < 0.0) {
sign = "-";
value = -value;
} else {
sign = "";
}
// correctly round to desired precision
expof10 = lrint( floor( log10(value) ) );
value *= pow(10.0, digits - 1 - expof10);
fract = modf(value, &display);
if(fract >= 0.5) display += 1.0;
value = display * pow(10.0, expof10 - digits + 1);
(int)((sizeof(prefix)/sizeof(char *)-1)*3))
if(expof10 > 0)
expof10 = (expof10/3)*3;
else
expof10 = ((-expof10+3)/3)*(-3);
double display, fract;
int expof10;
char *result, *sign;
value *= pow(10.0, -expof10);
if (value >= 1000.0) {
value /= 1000.0;
expof10 += 3;
}
else if(value >= 100.0)
digits -= 2;
else if(value >= 10.0)
digits -= 1;
if (bytes) {
int i = 0;
if(numeric || (expof10 < PREFIX_START) || (expof10 > PREFIX_END))
if (expof10 == 0)
result = tprintf("%s%.*f", sign, digits-1, value);
else
result = tprintf("%s%.*fe%d", sign, digits-1, value, expof10);
else
result = tprintf("%s%.*f %s", sign, digits-1, value, prefix[(expof10-PREFIX_START)/3]);
// Divide by 1024 until the unit is reached
while (value >= 1024. && i < 5) {
value /= 1024.;
i++;
}
result = tprintf("%.*g %s", digits - 1, value, prefix[i + 8]);
return result;
}
return result;
if(value < 0.0) {
sign = "-";
value = -value;
} else {
sign = "";
}
// correctly round to desired precision
expof10 = lrint( floor( log10(value) ) );
value *= pow(10.0, digits - 1 - expof10);
fract = modf(value, &display);
if(fract >= 0.5) display += 1.0;
value = display * pow(10.0, expof10 - digits + 1);
if(expof10 > 0)
expof10 = (expof10/3)*3;
else
expof10 = ((-expof10+3)/3)*(-3);
value *= pow(10.0, -expof10);
if (value >= 1000.0) {
value /= 1000.0;
expof10 += 3;
}
else if(value >= 100.0)
digits -= 2;
else if(value >= 10.0)
digits -= 1;
if(numeric || (expof10 < PREFIX_START) || (expof10 > PREFIX_END))
if (expof10 == 0)
result = tprintf("%s%.*f", sign, digits-1, value);
else
result = tprintf("%s%.*fe%d", sign, digits-1, value, expof10);
else
result = tprintf("%s%.*f %s", sign, digits-1, value, prefix[(expof10-PREFIX_START)/3]);
return result;
}