Function rb_sprintf 

pub unsafe extern "C" fn rb_sprintf(fmt: *const c_char, ...) -> VALUE

Ruby’s extended sprintf(3). We ended up reinventing the entire printf business because we don’t want to depend on locales. OS-provided printf routines might or might not, which caused instabilities of the result strings.

The format sequence is a mixture of format specifiers and other verbatim contents. Each format specifier starts with a %, and has the following structure:

%[flags][width][.precision][length]conversion

This function supports flags of , #, +, -, 0, width of non-negative decimal integer and *, precision of non-negative decimal integers and *, length of L, h, t, z, l, ll, q, conversions of A, D, E, G, O, U, X, a, c, d, e, f, g, i, n, o, p, s, u, x, and %. In case of _WIN32 it also supports I. And additionally, it supports magical PRIsVALUE macro that can stringise arbitrary Ruby objects:

[`rb_sprintf`]"|%"PRIsVALUE"|", RUBY_Qtrue); // => "|true|"
[`rb_sprintf`]"%+"PRIsVALUE, [`rb_stdin`];      // => "#<IO:<STDIN>>"

@param[in] fmt A printf-like format specifier. @param[in] … Variadic number of contents to format. @return A rendered new instance of ::rb_cString.

@internal

:FIXME: We can improve this document.

Generated by rb-sys for Ruby mri-x86_64-linux-gnu-3.2.3