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Copyright (c) 2016, stephen mcquay |
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All rights reserved. |
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Redistribution and use in source and binary forms, with or without modification, |
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are permitted provided that the following conditions are met: |
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* Redistributions of source code must retain the above copyright notice, |
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this list of conditions and the following disclaimer. |
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* Redistributions in binary form must reproduce the above copyright notice, |
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this list of conditions and the following disclaimer in the documentation |
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and/or other materials provided with the distribution. |
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* Neither the name of allowances nor the names of its contributors |
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may be used to endorse or promote products derived from this software |
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without specific prior written permission. |
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|
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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package main |
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import ( |
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"fmt" |
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"io" |
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"os" |
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"github.com/dustin/go-humanize" |
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) |
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const usage = "lim <number of bytes, default 1MB>" |
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func main() { |
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size := int64(1 * 1024 * 1024) |
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switch len(os.Args) { |
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case 1: |
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case 2: |
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dest, err := humanize.ParseBytes(os.Args[1]) |
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if err != nil { |
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fmt.Fprintf(os.Stderr, "unable to parse quantity: %v\n%v\n", err, usage) |
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os.Exit(1) |
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} |
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size = int64(dest) |
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default: |
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fmt.Fprintf(os.Stderr, "%v\n", usage) |
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os.Exit(1) |
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} |
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lr := io.LimitReader(os.Stdin, size) |
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io.Copy(os.Stdout, lr) |
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} |
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