wehub-resource-sync
57 lines
1.7 KiB
Go
57 lines
1.7 KiB
Go
// Copyright 2025 Dolthub, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package pg_extension
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/*
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#cgo CFLAGS: "-I${SRCDIR}/library"
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#include "exports.h"
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static inline Datum CallFmgrFunctionC(FunctionCallInfo fcinfo) {
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return ((PGFunction)fcinfo->flinfo->fn_addr)(fcinfo);
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}
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*/
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import "C"
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import "unsafe"
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// Datum is a C pointer to some data. Depending on the function being called, it may not be a pointer that should be
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// freed, as some functions return pointers to static memory.
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type Datum uintptr
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// NullableDatum is used for arguments to Fmgr function calls.
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type NullableDatum struct {
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Value Datum
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IsNull bool
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}
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// CallFmgrFunction calls the given function and forwards the arguments.
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func CallFmgrFunction(fn uintptr, args ...NullableDatum) (result Datum, isNotNull bool) {
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fi := Malloc[C.FmgrInfo]()
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defer Free(fi)
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ZeroMemory(fi)
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fc := Malloc[C.FunctionCallInfoBaseData]()
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defer Free(fc)
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ZeroMemory(fc)
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fi.fn_addr = unsafe.Pointer(fn)
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fc.flinfo = fi
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fc.nargs = C.int16_t(len(args))
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for i, arg := range args {
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fc.args[i].value = C.Datum(arg.Value)
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fc.args[i].isnull = C.bool(arg.IsNull)
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}
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result = Datum(C.CallFmgrFunctionC(fc))
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return result, !bool(fc.isnull) && result != 0
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}
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