|
HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
|
|
NAME | C SYNOPSIS | DESCRIPTION | NOTES | SEE ALSO | COLOPHON |
|
|
|
PMNUMBERSTR(3) Library Functions Manual PMNUMBERSTR(3)
pmNumberStr, pmNumberStr_r - fixed width output format for
numbers
#include <pcp/pmapi.h>
const char *pmNumberStr(double value);
char *pmNumberStr_r(double value, char *buf, int buflen);
cc ... -lpcp
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.
pmNumberStr returns a pointer to a static buffer and hence is not
thread-safe. Multi-threaded applications should use
pmNumberStr_r instead.
printf(3)
This page is part of the PCP (Performance Co-Pilot) project.
Information about the project can be found at
⟨http://www.pcp.io/⟩. If you have a bug report for this manual
page, send it to [email protected]. This page was obtained from the
project's upstream Git repository
⟨https://github.com/performancecopilot/pcp.git⟩ on 2024-06-14.
(At that time, the date of the most recent commit that was found
in the repository was 2024-06-14.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
[email protected]
Performance Co-Pilot PCP PMNUMBERSTR(3)
|
HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
|