Oracle VirtualBox

https://www.virtualbox.org/manual

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Oracle VirtualBox is a powerful x86 and AMD64/Intel64 virtualization product for enterprise as well...

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### Implement shell script option parsing with ltmain.sh

Source: https://www.virtualbox.org/manual/licensing/vbox-base/licensing-licensing-info.html

This library provides shell script option parsing and supporting features. The example shows the minimal setup required for simple scripts.

```bash
#!/bin/sh
. relative/path/to/funclib.sh
. relative/path/to/options-parser
scriptversion=1.0
func_options ${1+"$@"}
eval set dummy "$func_options_result"; shift
...rest of your script...
```

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### Configure pngrio.c data input

Source: https://www.virtualbox.org/manual/licensing/vbox-base/licensing-licensing-info.html

This file handles data input. Users needing custom input methods should write a replacement function and register it at runtime using png_set_read_fn().

```c
/* pngrio.c - functions for data input
 *
 * Copyright (c) 2018 Cosmin Truta
 * Copyright (c) 1998-2002,2004,2006-2016,2018 Glenn Randers-Pehrson
 * Copyright (c) 1996-1997 Andreas Dilger
 * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
 *
 * This code is released under the libpng license.
 * For conditions of distribution and use, see the disclaimer
 * and license in png.h
 *
 * This file provides a location for all input.  Users who need
 * special handling are expected to write a function that has the same
 * arguments as this and performs a similar function, but that possibly
 * has a different input method.  Note that you shouldn't change this
 * function, but rather write a replacement function and then make
 * libpng use it at run time with png_set_read_fn(...).
 */
```

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