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FFI: Pass pointer to uninit Features struct in tts_supported_features()

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This is done because the ABI for returning struct values isn't well
defined.
This commit is contained in:
Michael Connor Buchan 2022-07-23 13:41:39 +01:00
parent 1597797c57
commit f39f86aa13
1 changed files with 5 additions and 4 deletions
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9
src/ffi.rs
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@ -7,7 +7,7 @@ use std::{
ptr, ptr,
}; };
use crate::{Backends, Features, UtteranceId, Tts}; use crate::{Backends, Features, Tts, UtteranceId};
thread_local! { thread_local! {
/// Stores the last reported error, so it can be retrieved at will from C /// Stores the last reported error, so it can be retrieved at will from C
@ -78,11 +78,12 @@ pub unsafe extern "C" fn tts_free(tts: *mut Tts) {
Box::from_raw(tts); // Goes out of scope and is dropped Box::from_raw(tts); // Goes out of scope and is dropped
} }
/// Returns the features supported by this Tts engine. /// Returns the features supported by this Tts engine in the object specified by `features`.
/// `tts` must be a valid pointer to a Tts object. /// `tts` must be a valid pointer to a Tts object.
/// `features` must be a valid pointer to an uninitialized `Features` object.
#[no_mangle] #[no_mangle]
pub unsafe extern "C" fn tts_supported_features(tts: *const Tts) -> Features { pub unsafe extern "C" fn tts_supported_features(tts: *const Tts, features: *mut Features) {
tts.as_ref().unwrap().supported_features() *features = tts.as_ref().unwrap().supported_features()
} }
/// Speaks the specified text, optionally interrupting current speech. /// Speaks the specified text, optionally interrupting current speech.