Function Rf_qnorm5_unchecked 

pub unsafe extern "C-unwind" fn Rf_qnorm5_unchecked(
    p: f64,
    mu: f64,
    sigma: f64,
    lower_tail: c_int,
    log_p: c_int,
) -> f64

Normal quantile function: qnorm(p, mean = mu, sd = sigma, lower.tail = lower_tail, log.p = log_p).

Rf_qnorm5 from Rmath.h (the qnorm and qnorm5 macros resolve to it). With a non-zero log_p, p is a log probability; with lower_tail = 0, p is an upper-tail probability. p = 0 and p = 1 (or -Inf / 0 on the log scale) return -Inf / Inf as the tail requires.

R conditions

A p outside [0, 1] (outside [-Inf, 0] on the log scale) or a negative sigma returns NaN without a warning (nmath does not report domain errors). nmath reports other problems through R’s warning(), and under options(warn = 2) a warning becomes an R error, which longjmps. Call this where such a longjmp is caught: a #[miniextendr] function body, or with_r_unwind_protect. #[r_ffi_checked] gives thread routing and checking only, not an unwind guard. Unchecked FFI binding for Rf_qnorm5. Generated from source location line 1751, column 12. Generated from source file miniextendr-api/src/sys.rs.