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//! Code related to `sqlite3_context` common to `functions` and `vtab` modules.
use std::os::raw::{c_int, c_void};
#[cfg(feature = "array")]
use std::rc::Rc;
use crate::ffi;
use crate::ffi::sqlite3_context;
use crate::str_for_sqlite;
use crate::types::{ToSqlOutput, ValueRef};
#[cfg(feature = "array")]
use crate::vtab::array::{free_array, ARRAY_TYPE};
// This function is inline despite it's size because what's in the ToSqlOutput
// is often known to the compiler, and thus const prop/DCE can substantially
// simplify the function.
#[inline]
pub(super) unsafe fn set_result(ctx: *mut sqlite3_context, result: &ToSqlOutput<'_>) {
let value = match *result {
ToSqlOutput::Borrowed(v) => v,
ToSqlOutput::Owned(ref v) => ValueRef::from(v),
#[cfg(feature = "blob")]
ToSqlOutput::ZeroBlob(len) => {
// TODO sqlite3_result_zeroblob64 // 3.8.11
return ffi::sqlite3_result_zeroblob(ctx, len);
}
#[cfg(feature = "array")]
ToSqlOutput::Array(ref a) => {
return ffi::sqlite3_result_pointer(
ctx,
Rc::into_raw(a.clone()) as *mut c_void,
ARRAY_TYPE,
Some(free_array),
);
}
};
match value {
ValueRef::Null => ffi::sqlite3_result_null(ctx),
ValueRef::Integer(i) => ffi::sqlite3_result_int64(ctx, i),
ValueRef::Real(r) => ffi::sqlite3_result_double(ctx, r),
ValueRef::Text(s) => {
let length = s.len();
if length > c_int::MAX as usize {
ffi::sqlite3_result_error_toobig(ctx);
} else {
let (c_str, len, destructor) = match str_for_sqlite(s) {
Ok(c_str) => c_str,
// TODO sqlite3_result_error
Err(_) => return ffi::sqlite3_result_error_code(ctx, ffi::SQLITE_MISUSE),
};
// TODO sqlite3_result_text64 // 3.8.7
ffi::sqlite3_result_text(ctx, c_str, len, destructor);
}
}
ValueRef::Blob(b) => {
let length = b.len();
if length > c_int::MAX as usize {
ffi::sqlite3_result_error_toobig(ctx);
} else if length == 0 {
ffi::sqlite3_result_zeroblob(ctx, 0);
} else {
// TODO sqlite3_result_blob64 // 3.8.7
ffi::sqlite3_result_blob(
ctx,
b.as_ptr().cast::<c_void>(),
length as c_int,
ffi::SQLITE_TRANSIENT(),
);
}
}
}
}
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