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PMNUMBERSTR

NAME

pmNumberStr, pmNumberStr − fixed width output format for numbers

C SYNOPSIS

#include <pcp/pmapi.h>

const char *pmNumberStr(double value);
char *pmNumberStr_r(double
value, char *buf, int buflen);

cc ... −lpcp

DESCRIPTION

pmNumberStr returns the address of a 8-byte buffer that holds a null-byte terminated representation of value suitable for output with fixed width fields. The pmNumberStr_r function does the same, but stores the result in a user-supplied buffer buf of length buflen, which should have room for at least 8 bytes.

The value is scaled using multipliers in powers of ‘‘one thousand’’ (the decimal ‘‘kilo’’) and has a bias that provides greater precision for positive numbers as opposed to negative numbers.

The format depends on the sign and magnitude of value as follows (d represents a decimal digit):

img

At the boundary points of the ranges, the chosen format will retain the maximum number of significant digits.

NOTES

pmNumberStr returns a pointer to a static buffer and hence is not thread-safe. Multi-threaded applications should use pmNumberStr_r instead.

SEE ALSO

printf(3)

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