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fix idxStr freeing issue (#898) 

uses snippet suggested by @rittneje https://github.com/mattn/go-sqlite3/issues/897#issuecomment-752162125
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Patrick DeVivo 2021-10-25 17:13:24 +02:00 committed by GitHub
parent 98d34f9dc5
commit 2b780b4a7f
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1 changed files with 15 additions and 4 deletions
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19
sqlite3_opt_vtable.go
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@ -472,10 +472,21 @@ func goVBestIndex(pVTab unsafe.Pointer, icp unsafe.Pointer) *C.char {
}
info.idxNum = C.int(res.IdxNum)
idxStr := C.CString(res.IdxStr)
defer C.free(unsafe.Pointer(idxStr))
info.idxStr = idxStr
info.needToFreeIdxStr = C.int(0)
info.idxStr = (*C.char)(C.sqlite3_malloc(C.int(len(res.IdxStr) + 1)))
if info.idxStr == nil {
// C.malloc and C.CString ordinarily do this for you. See https://golang.org/cmd/cgo/
panic("out of memory")
}
info.needToFreeIdxStr = C.int(1)
idxStr := *(*[]byte)(unsafe.Pointer(&reflect.SliceHeader{
Data: uintptr(unsafe.Pointer(info.idxStr)),
Len: len(res.IdxStr) + 1,
Cap: len(res.IdxStr) + 1,
}))
copy(idxStr, res.IdxStr)
idxStr[len(idxStr)-1] = 0 // null-terminated string
if res.AlreadyOrdered {
info.orderByConsumed = C.int(1)
}