libowfat/fmt/fmt_humank.c

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637 B
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#include "fmt.h"
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size_t fmt_humank(char* dest,unsigned long long l) {
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char unit;
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size_t i;
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if (l<1000) return fmt_ulong(dest,l);
if (l>1024*1024*1024*1024ull) {
l=(l+(1024*1024*1024*1024ull/20))/(1024*1024*1024*1024ull/10);
unit='T';
} else if (l>1024*1024*1024) {
l=(l+(1024*1024*1024/20))/(1024*1024*1024/10);
unit='G';
} else if (l>1024*1024) {
l=(l+(1024*1024/20))/(1024*1024/10);
unit='M';
} else {
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l=(l+(1024/20))/(1024/10);
unit='k';
}
if (!dest) return fmt_ulong(0,l)+2;
i=fmt_ulong(dest,l/10);
dest[i]='.';
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dest[i+1]=(char)((l%10)+'0');
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dest[i+2]=unit;
return i+3;
}