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46 lines
1.5 KiB
Go
46 lines
1.5 KiB
Go
//go:build linux && !appengine
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// +build linux,!appengine
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// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package cmd
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import (
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"bytes"
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"fmt"
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"syscall"
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"unsafe"
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)
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func direntNamlen(dirent *syscall.Dirent) (uint64, error) {
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const fixedHdr = uint16(unsafe.Offsetof(syscall.Dirent{}.Name))
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nameBuf := (*[unsafe.Sizeof(dirent.Name)]byte)(unsafe.Pointer(&dirent.Name[0]))
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const nameBufLen = uint16(len(nameBuf))
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limit := dirent.Reclen - fixedHdr
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if limit > nameBufLen {
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limit = nameBufLen
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}
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// Avoid bugs in long file names
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// https://github.com/golang/tools/commit/5f9a5413737ba4b4f692214aebee582b47c8be74
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nameLen := bytes.IndexByte(nameBuf[:limit], 0)
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if nameLen < 0 {
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return 0, fmt.Errorf("failed to find terminating 0 byte in dirent")
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}
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return uint64(nameLen), nil
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}
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