nbdkit_parse_probability - Man Page

 #include <nbdkit-plugin.h>

 int nbdkit_parse_probability (const char *what, const char *str,
                               double *ret);

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.

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.

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>

nbdkit_parse_probability was added in nbdkit 1.36.

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).

Richard W.M. Jones

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