NAME¶

nbdkit_parse_probability - parse probabilities for nbdkit

SYNOPSIS¶

 #include <nbdkit-plugin.h>
 int nbdkit_parse_probability (const char *what, const char *str,
                               double *ret);

DESCRIPTION¶

Use the "nbdkit_parse_probability" utility function to parse probabilities. Common formats understood include: "0.1", "1e-1", "10%", "1:10" or "1/10", which all mean a probability of 1 in 10.

The "what" parameter is printed in error messages to provide context. The "str" parameter is the probability string.

RETURN VALUE¶

On success the function returns 0 and sets *ret. The probability is always a finite number ≥ 0.0, but note the result may be larger than 1.0 (for example if "str == "200%"" then the function will set "*ret = 2.0"). If you want to clamp the upper bound the caller must do that.

On error, nbdkit_error(3) is called and -1 is returned.

LANGUAGE BINDINGS¶

In nbdkit-ocaml-plugin(3):

 NBDKit.parse_probability : string -> string -> float

In nbdkit-python-plugin(3):

 import nbdkit
 size = nbdkit.parse_probability(what, str)

In nbdkit-rust-plugin(3):

 use nbdkit::*;
 pub fn parse_probability(what: &str, s: &str) -> Result<f64>

HISTORY¶

"nbdkit_parse_probability" was added in nbdkit 1.36.

SEE ALSO¶

nbdkit(1), nbdkit_parse_bool(3), nbdkit_parse_delay(3), nbdkit_parse_int(3), nbdkit_parse_size(3), nbdkit-plugin(3), nbdkit-filter(3), nbdkit-error-filter(1), nbdkit-evil-filter(1).

AUTHORS¶

Richard W.M. Jones

COPYRIGHT¶

Copyright Red Hat

LICENSE¶

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

• Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
• Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
• Neither the name of Red Hat nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.