PMNUMBERSTR

Section: C Library Functions (3)
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NAME

pmNumberStr , pmNumberStr_r - 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):

value range format


> 999995000000000
inf?
999995000000000 - 999995000000 ddd.ddT

999995000000 - 999995000
ddd.ddG

999995000 - 999995
ddd.ddM

999995 - 999.995
ddd.ddK

999.995 - 0.005
ddd.dd

0.005 - -0.005
0.00

-0.005 - -99.95
-dd.dd

-99.995 - -99995
-dd.ddK

-99995 - -99995000
-dd.ddM

-99995000 - -99995000000
-dd.ddG

-99995000000 - -99995000000000
-dd.ddT

< -99995000000000
-inf?

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)


Index

NAME
C SYNOPSIS
DESCRIPTION
NOTES
SEE ALSO