68 lines
1.8 KiB
Go
68 lines
1.8 KiB
Go
/*
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* Copyright (c) 2024 The GoPlus Authors (goplus.org). All rights reserved.
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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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*/
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package runtime
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import (
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"unsafe"
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"github.com/goplus/llgo/internal/runtime/c"
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)
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// -----------------------------------------------------------------------------
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// String is the runtime representation of a string.
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// It cannot be used safely or portably and its representation may
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// change in a later release.
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//
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// Unlike reflect.StringHeader, its Data field is sufficient to guarantee the
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// data it references will not be garbage collected.
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type String struct {
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data unsafe.Pointer
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len int
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}
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// EmptyString returns an empty string.
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func EmptyString() String {
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return String{nil, 0}
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}
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// StringLen returns the length of a string.
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func StringLen(s Slice) int {
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return s.len
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}
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// StringData returns the data pointer of a string.
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func StringData(s String) unsafe.Pointer {
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return s.data
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}
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// CStrCopy copies a Go string to a C string buffer and returns it.
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func CStrCopy(dest unsafe.Pointer, s String) *int8 {
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n := s.len
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c.Memcpy(dest, s.data, uintptr(n))
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arr := (*[1 << 30]int8)(dest)
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arr[n] = 0
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return (*int8)(dest)
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}
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func CStrDup(s String) *int8 {
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dest := Alloc(uintptr(s.len + 1))
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return CStrCopy(dest, s)
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}
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// -----------------------------------------------------------------------------
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