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This results in all multi-byte characters to be encoded in a way that naive unvis(3) implementations will not bork up the encoding. In addition, it also ensures that the output of Vis will always be ASCII *only*. Also test far more cases in *_test.go when it comes to different flags, and do far more tests to ensure that the output of Vis() makes sense. These outputs come directly from vis(3) and so are useful regression tests to ensure that the handling of Vis() is identical to the original. Signed-off-by: Aleksa Sarai <asarai@suse.de>
38 lines
1.7 KiB
Go
38 lines
1.7 KiB
Go
/*
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* govis: unicode aware vis(3) encoding implementation
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* Copyright (C) 2017 SUSE LLC.
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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 govis
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type VisFlag uint
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// vis() has a variety of flags when deciding what encodings to use. While
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// mtree only uses one set of flags, implementing them all is necessary in
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// order to have compatibility with BSD's vis() and unvis() commands.
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const (
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VisOctal VisFlag = (1 << iota) // VIS_OCTAL: Use octal \ddd format.
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VisCStyle // VIS_CSTYLE: Use \[nrft0..] where appropriate.
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VisSpace // VIS_SP: Also encode space.
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VisTab // VIS_TAB: Also encode tab.
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VisNewline // VIS_NL: Also encode newline.
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VisSafe // VIS_SAFE: Encode unsafe characters.
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VisNoSlash // VIS_NOSLASH: Inhibit printing '\'.
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VisHTTPStyle // VIS_HTTPSTYLE: HTTP-style escape %xx.
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VisGlob // VIS_GLOB: Encode glob(3) magics.
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visMask VisFlag = (1 << iota) - 1 // Mask of all flags.
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VisWhite VisFlag = (VisSpace | VisTab | VisNewline)
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)
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