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Renamed ./src/external to ./src/extensions. No code logic changes. (0.40.5)

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Johannes Findeisen 2026-04-19 00:02:36 +02:00
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---
layout: page
published: true
noToc: false
noComments: false
noDate: false
title: Fun - cURL (libcurl) extension (optional)
subtitle: Documentation for cURL (libcurl) extension (optional)
description: Documentation for cURL (libcurl) extension (optional)
permalink: /documentation/extensions/curl/
lang: en
tags:
- curl
- extension
- libcurl
- optional
---
- CMake option: FUN_WITH_CURL=ON
- Purpose: HTTP helpers using libcurl.
- Homepage: [https://curl.se/libcurl/](https://curl.se/libcurl/){:class="ext"}
## Opcodes:
- OP_CURL_GET: GET; pops url:string; pushes body:string (empty on error/disabled)
- OP_CURL_POST: POST; pops body:string, url:string; pushes response:string
- OP_CURL_DOWNLOAD: Download to file; pops path:string, url:string; pushes 1/0
## Notes:
- Requires libcurl development headers/libs.
- When disabled, helpers return empty strings/0 to match optional behavior.

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---
layout: page
published: true
noToc: false
noComments: false
noDate: false
title: Fun - Optional extensions
subtitle: Catalog of optional, build-time selectable extensions for the Fun VM (e.g., cURL, SQLite, JSON).
description: Catalog of optional, build-time selectable extensions for the Fun VM (e.g., cURL, SQLite, JSON).
permalink: /documentation/extensions/
lang: en
tags:
- area
- catalog
- contains
- env
- example
- examples
- extension
- extensions
- extensions
- integrations
- optional
- required
- requirements
- run
- scripts
- them
- under
- vars
- what
---
This section documents Fun's optional, build-time selectable extensions. Each page covers:
- How to enable the extension via CMake option (FUN_WITH_*)
- Build requirements and detection notes
- Available opcodes and/or helper functions
- Minimal usage examples and links to example scripts
## Extensions:
- [cURL (libcurl)](./curl/)
- [INI (iniparser)](./ini/)
- [JSON (json-c)](./json/)
- [libxml2 (XML)](./xml2/)
- [SQLite](./sqlite/)
- [PCRE2 (Perl-compatible regex)](./pcre2/)
- [PC/SC (Smart cards)](./pcsc/)
- [OpenSSL](./openssl/)
## Notes:
- These integrations are optional; the VM compiles without them.
- When disabled, related builtins usually return empty strings/neutral values rather than fail hard, mirroring existing optionality patterns.

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---
layout: page
published: true
noToc: false
noComments: false
noDate: false
title: Fun - INI (iniparser) extension (optional)
subtitle: Documentation for INI (iniparser) extension (optional)
description: Documentation for INI (iniparser) extension (optional)
permalink: /documentation/extensions/ini/
lang: en
tags:
- extension
- ini
- iniparser
- optional
---
- CMake option: FUN_WITH_INI=ON
- Purpose: Read/write simple INI configuration files.
- Homepage: [https://github.com/ndevilla/iniparser](https://github.com/ndevilla/iniparser){:class="ext"}
## Opcodes:
- OP_INI_LOAD: pops path; pushes handle (>0) or 0
- OP_INI_FREE: pops handle; pushes 1/0
- OP_INI_GET_STRING: pops def, key, section, handle; pushes string
- OP_INI_GET_INT: pops def, key, section, handle; pushes int
- OP_INI_GET_DOUBLE: pops def, key, section, handle; pushes float
- OP_INI_GET_BOOL: pops def, key, section, handle; pushes 0/1
- OP_INI_SET: pops value, key, section, handle; pushes 1/0
- OP_INI_UNSET: pops key, section, handle; pushes 1/0
- OP_INI_SAVE: pops path, handle; pushes 1/0
## Notes:
- Requires iniparser development headers/libs.
- When disabled, helpers return neutral values (0/empty strings) like other optional extensions.

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---
layout: page
published: true
noToc: false
noComments: false
noDate: false
title: Fun - JSON (json-c) extension (optional)
subtitle: Documentation for JSON (json-c) extension (optional)
description: Documentation for JSON (json-c) extension (optional)
permalink: /documentation/extensions/json/
lang: en
tags:
- extension
- json
- optional
---
- CMake option: FUN_WITH_JSON=ON
- Purpose: JSON parse/stringify and file helpers via json-c.
- Homepage: [https://json-c.github.io/json-c/](https://json-c.github.io/json-c/){:class="ext"}
## Opcodes:
- OP_JSON_PARSE: pops text; pushes value or Nil on error
- OP_JSON_STRINGIFY: pops pretty:int(0/1), value; pushes string
- OP_JSON_FROM_FILE: pops path; pushes value or Nil
- OP_JSON_TO_FILE: pops pretty:int(0/1), value, path; pushes 1/0
## Notes:
- Requires json-c development headers/libs.
- When disabled, functions push empty/neutral values similar to other optional modules.

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---
layout: page
published: true
noToc: false
noComments: false
noDate: false
title: Fun - OpenSSL extension (optional)
subtitle: Documentation for OpenSSL extension (optional)
description: Documentation for OpenSSL extension (optional)
permalink: /documentation/extensions/openssl/
lang: en
tags:
- extension
- openssl
- optional
---
- CMake option: FUN_WITH_OPENSSL=ON
- Purpose: provide small crypto helpers backed by OpenSSL. Includes md5, sha256, sha512, ripemd160 helpers.
- Homepage: [https://www.openssl.org/](https://www.openssl.org/){:class="ext"}
## Build notes:
- Requires system OpenSSL development headers and libraries.
- On OpenSSL 3.x, legacy MD5_* APIs are deprecated; you may see warnings during build.
## Provided helper/opcodes:
- Function: openssl_md5(data:string) -> string (lowercase hex). Falls back to empty string when the extension is disabled, mirroring other optional modules.
- Function: openssl_sha256(data:string) -> string (lowercase hex).
- Function: openssl_sha512(data:string) -> string (lowercase hex).
- Function: openssl_ripemd160(data:string) -> string (lowercase hex). Note: On OpenSSL 3.x this may require the legacy provider; if the digest is unavailable, the helper returns an empty string.
- Opcodes: OP_OPENSSL_MD5, OP_OPENSSL_SHA256, OP_OPENSSL_SHA512, OP_OPENSSL_RIPEMD160 (internal mappings for the functions above).
## Quickstart:
- Configure: cmake -S . -B build -DFUN_WITH_OPENSSL=ON
- Build: cmake --build build --target fun
- Run examples:
- ./build/fun examples/crypto/openssl_md5.fun
- ./build/fun examples/crypto/openssl_sha256.fun
- ./build/fun examples/crypto/openssl_sha512.fun
- ./build/fun examples/crypto/openssl_ripemd160.fun
## Example output:
- md5(abc) = 900150983cd24fb0d6963f7d28e17f72
- md5("") = d41d8cd98f00b204e9800998ecf8427e
- sha256(abc) = ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad
- sha256("") = e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
- sha512(abc) = ddaf35a193617abacc417349ae20413112e6fa4e89a97ea20a9eeee64b55d39a2192992a274fc1a836ba3c23a3feebbd454d4423643ce80e2a9ac94fa54ca49f
- sha512("") = cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e
- ripemd160(abc) = 8eb208f7e05d987a9b044a8e98c6b087f15a0bfc
- ripemd160("") = 9c1185a5c5e9fc54612808977ee8f548b2258d31
## Notes:
- The OpenSSL 3.x provider configuration on your system determines availability of RIPEMD-160. If the legacy provider is not enabled, openssl_ripemd160() will return an empty string.

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---
layout: page
published: true
noToc: false
noComments: false
noDate: false
title: Fun - PCRE2 (Perl-Compatible Regex) extension (optional)
subtitle: Documentation for PCRE2 (Perl-Compatible Regex) extension (optional)
description: Documentation for PCRE2 (Perl-Compatible Regex) extension (optional)
permalink: /documentation/extensions/pcre2/
lang: en
tags:
- compatible
- extension
- optional
- pcre2
- perl
- regex
---
- CMake option: FUN_WITH_PCRE2=ON
- Purpose: Advanced regular expressions via PCRE2.
- Homepage: [https://www.pcre.org/](https://www.pcre.org/){:class="ext"}
## Opcodes:
- OP_PCRE2_TEST: pops flags, text, pattern; pushes 1/0
- OP_PCRE2_MATCH: pops flags, text, pattern; pushes match map or Nil
- OP_PCRE2_FINDALL: pops flags, text, pattern; pushes array of match maps
## Notes:
- Requires PCRE2 development headers/libs.
- Flags are backend-specific; see implementation for supported bits.

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---
layout: page
published: true
noToc: false
noComments: false
noDate: false
title: Fun - PC/SC (smart cards) extension (optional)
subtitle: Documentation for PC/SC (smart cards) extension (optional)
description: Documentation for PC/SC (smart cards) extension (optional)
permalink: /documentation/extensions/pcsc/
lang: en
tags:
- cards
- extension
- optional
- smart
---
- CMake option: FUN_WITH_PCSC=ON
- Purpose: Access smart card readers/cards via PC/SC (pcsclite).
- Homepage: [https://pcsclite.apdu.fr/](https://pcsclite.apdu.fr/){:class="ext"}
## Opcodes:
- OP_PCSC_ESTABLISH: returns context id (>0) or 0
- OP_PCSC_RELEASE: pops ctx id; returns 1/0
- OP_PCSC_LIST_READERS: pops ctx id; returns array of reader names
- OP_PCSC_CONNECT: pops reader, ctx id; returns handle (>0) or 0
- OP_PCSC_DISCONNECT: pops handle id; returns 1/0
- OP_PCSC_TRANSMIT: pops apdu, handle id; returns map with data/SW/rc
## Notes:
- Requires PC/SC lite development headers/libs.
- Behavior and availability depend on platform and reader drivers.

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---
layout: page
published: true
noToc: false
noComments: false
noDate: false
title: Fun - SQLite extension (optional)
subtitle: Documentation for SQLite extension (optional)
description: Documentation for SQLite extension (optional)
permalink: /documentation/extensions/sqlite/
lang: en
tags:
- extension
- optional
- sqlite
---
- CMake option: FUN_WITH_SQLITE=ON
- Purpose: Access SQLite databases via the native C API.
- Homepage: [https://www.sqlite.org/](https://www.sqlite.org/){:class="ext"}
## Opcodes:
- OP_SQLITE_OPEN: pops path; pushes handle (>0) or 0
- OP_SQLITE_CLOSE: pops handle; pushes Nil
- OP_SQLITE_EXEC: pops sql, handle; pushes rc:int (0=OK)
- OP_SQLITE_QUERY: pops sql, handle; pushes array<map>
## Notes:
- Requires SQLite development headers/libs.
- See also: `libSQL` for a compatible alternative backend.

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---
layout: page
published: true
noToc: false
noComments: false
noDate: false
title: Fun - XML (libxml2) extension (optional)
subtitle: Documentation for XML (libxml2) extension (optional)
description: Documentation for XML (libxml2) extension (optional)
permalink: /documentation/extensions/xml2/
lang: en
tags:
- extension
- libxml2
- optional
- xml
---
- CMake option: FUN_WITH_XML2=ON
- Purpose: Minimal XML parsing helpers using libxml2.
- Homepage: [http://xmlsoft.org/](http://xmlsoft.org/){:class="ext"}
## Opcodes:
- OP_XML_PARSE: pops text; pushes doc handle (>0) or 0
- OP_XML_ROOT: pops doc handle; pushes node handle (>0) or 0
- OP_XML_NAME: pops node handle; pushes string (node name)
- OP_XML_TEXT: pops node handle; pushes string (concatenated text)
## Notes:
- Requires libxml2 development headers/libs.
- On many systems, the include path is `/usr/include/libxml2`.