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use crate::abort_on_panic;
use libc::c_char;
use libnewsboat::matchererror::MatcherError;
use std::ffi::CString;
use std::ptr;
// These constants MUST match numbers in `enum MatcherException::Type`, see include/matcherexception.h
const ATTRIB_UNAVAIL: u8 = 0;
const INVALID_REGEX: u8 = 1;
#[repr(C)]
pub struct MatcherErrorFfi {
err_type: u8, // One of the constants defined above
info: *mut c_char,
info2: *mut c_char,
}
#[no_mangle]
pub fn matcher_error_to_ffi(error: MatcherError) -> MatcherErrorFfi {
abort_on_panic(|| {
match error {
MatcherError::AttributeUnavailable { attr } => {
// NUL bytes in filter expressions are disallowed by the parser, so attribute name is
// safe and unwrap() here won't ever be triggered.
let info = CString::new(attr).unwrap().into_raw();
MatcherErrorFfi {
err_type: ATTRIB_UNAVAIL,
info,
info2: ptr::null_mut(),
}
}
MatcherError::InvalidRegex { regex, errmsg } => {
// NUL bytes in filter expressions are disallowed by the parser, so regex here is safe
// and unwrap() won't be triggered.
let info = CString::new(regex).unwrap().into_raw();
// Error message comes from regerror, which is a C function. Since it returns
// a C string, it's obvious that errmsg won't contain NUL bytes. Thus, unwrap() here
// won't ever be triggered.
let info2 = CString::new(errmsg).unwrap().into_raw();
MatcherErrorFfi {
err_type: INVALID_REGEX,
info,
info2,
}
}
}
})
}
#[no_mangle]
pub unsafe extern "C" fn rs_get_test_attr_unavail_error() -> MatcherErrorFfi {
matcher_error_to_ffi(MatcherError::AttributeUnavailable {
attr: String::from("test_attribute"),
})
}
#[no_mangle]
pub unsafe extern "C" fn rs_get_test_invalid_regex_error() -> MatcherErrorFfi {
matcher_error_to_ffi(MatcherError::InvalidRegex {
regex: String::from("?!"),
errmsg: String::from("inconceivable happened!"),
})
}
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