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authorMitja Felicijan <mitja.felicijan@gmail.com>2023-10-29 14:41:39 +0100
committerMitja Felicijan <mitja.felicijan@gmail.com>2023-10-29 14:41:39 +0100
commit2836163e54e3b94342113314e70ee564c456c43e (patch)
tree59b82fc69e83cc6d92846a8e9f510b0bb865cf3b /public/extend-lua-with-custom-c.html
parentd50ea4053ea04abb3a455606d4591a8283af0677 (diff)
downloadmitjafelicijan.com-2836163e54e3b94342113314e70ee564c456c43e.tar.gz
Added public folder to git so it get get deployed on vercel
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1<!doctype html><html lang=en-us><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><link href="data:image/x-icon;base64,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" rel=icon type=image/x-icon><title>Extend Lua with custom C functions using Clang</title><meta name=description content="Here is a boilerplate for extending Lua with custom C functions."><link rel=alternate type=application/rss+xml title="Mitja Felicijan's posts" href=https://mitjafelicijan.com/index.xml><link rel=alternate type=application/rss+xml title="Mitja Felicijan's notes" href=https://mitjafelicijan.com/notes.xml><style>body{padding:1rem;max-width:760px;background:#fff;font-family:sans-serif;line-height:1.35rem;font-size:16px;margin:0 auto}hr{margin-block-start:1.5rem}h1,h2,h3{line-height:initial}h1{font-size:xx-large}footer{margin-block-start:2rem}cap{text-transform:capitalize}table{max-width:100%;width:100%;border-collapse:separate;border-spacing:2px;border:1px solid #000;border-left:1px solid #999;border-top:1px solid #999}blockquote{font-style:italic}table thead{background:#eee}ul.list li{padding:.2em 0}ul{line-height:1.4em}td,th{border:1px solid #000;padding:4px;border-right:1px solid #999;border-bottom:1px solid #999;text-align:left}pre{text-wrap:nowrap;overflow-x:auto;padding:0 1em;border:1px solid #dcdcdc}code{padding:0 3px;font-size:14px;border:0}pre code{line-height:1.3em}pre,code,pre *,code *{font-family:monospace}figure{margin-inline-start:0;margin-inline-end:0}figcaption{text-align:center}figcaption p{margin:.3em 0 0}img,video,audio{max-width:100%}header{display:flex;flex-direction:row;gap:3rem}nav{display:flex;gap:.75rem}nav.main{flex-grow:1}.pstatus-orange{background:gold}.pstatus-green{background:#9acd32}.pstatus-red{background:#cd5c5c}@media only screen and (max-width:600px){body{padding:15px}header{flex-direction:column;gap:1rem}a{word-wrap:break-word}}</style><header><nav class=main itemscope itemtype=http://schema.org/SiteNavigationElement role=toolbar><a href=/>Home</a>
2<a href=https://git.mitjafelicijan.com/ target=_blank>Git</a>
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7<a href=/index.xml target=_blank>RSS</a></nav></header><main role=main><article itemtype=http://schema.org/Article><h1 itemtype=headline>Extend Lua with custom C functions using Clang</h1><p><cap>note</cap>, May 23, 2023 on <a href=https://mitjafelicijan.com>Mitja Felicijan's blog</a><div><p>Here is a boilerplate for extending Lua with custom C functions. This requires
8Clang and Lua 5.1 to be installed. GCC can be used instead of Clang, but the
9Makefile will need to be modified.<ul><li><p>nativefunc.c<pre tabindex=0 style=background-color:#fff><code><span style=display:flex><span><span style=color:#00f>#include</span> <span style=color:#00f>&lt;lua.h&gt;</span><span style=color:#00f>
10</span></span></span><span style=display:flex><span><span style=color:#00f>#include</span> <span style=color:#00f>&lt;lauxlib.h&gt;</span><span style=color:#00f>
11</span></span></span><span style=display:flex><span><span style=color:#00f></span>
12</span></span><span style=display:flex><span><span style=color:#00f>static</span> <span style=color:#2b91af>int</span> l_mult50(lua_State *L) {
13</span></span><span style=display:flex><span> <span style=color:#2b91af>double</span> number = luaL_checknumber(L, 1);
14</span></span><span style=display:flex><span> lua_pushnumber(L, number * 50);
15</span></span><span style=display:flex><span> <span style=color:#00f>return</span> 1;
16</span></span><span style=display:flex><span>}
17</span></span><span style=display:flex><span>
18</span></span><span style=display:flex><span><span style=color:#2b91af>int</span> luaopen_nativefunc(lua_State *L) {
19</span></span><span style=display:flex><span> <span style=color:#00f>static</span> <span style=color:#00f>const</span> <span style=color:#00f>struct</span> luaL_Reg nativeFuncLib[] = {{<span style=color:#a31515>&#34;mult50&#34;</span>, l_mult50}, {NULL, NULL}};
20</span></span><span style=display:flex><span>
21</span></span><span style=display:flex><span> luaL_register(L, <span style=color:#a31515>&#34;nativelib&#34;</span>, nativeFuncLib);
22</span></span><span style=display:flex><span> <span style=color:#00f>return</span> 1;
23</span></span><span style=display:flex><span>}
24</span></span></code></pre><li><p>main.lua<pre tabindex=0 style=background-color:#fff><code><span style=display:flex><span>require <span style=color:#a31515>&#34;nativefunc&#34;</span>
25</span></span><span style=display:flex><span>print(nativelib.mult50(50))
26</span></span></code></pre><li><p>Makefile<pre tabindex=0 style=background-color:#fff><code><span style=display:flex><span>CC = clang
27</span></span><span style=display:flex><span>CFLAGS =
28</span></span><span style=display:flex><span>INCLUDES = <span style=color:#a31515>`</span>pkg-config lua5.1 --cflags-only-I<span style=color:#a31515>`</span>
29</span></span><span style=display:flex><span>
30</span></span><span style=display:flex><span>all:
31</span></span><span style=display:flex><span> <span style=color:#00f>$(</span>CC<span style=color:#00f>)</span> -shared -o nativefunc.so -fPIC nativefunc.c <span style=color:#00f>$(</span>CFLAGS<span style=color:#00f>)</span> <span style=color:#00f>$(</span>INCLUDES<span style=color:#00f>)</span>
32</span></span><span style=display:flex><span>
33</span></span><span style=display:flex><span>clean:
34</span></span><span style=display:flex><span> rm *.so
35</span></span></code></pre></ul></div></div></main><section><hr><h2>Posts from blogs I follow around the net</h2><ul><li><a href=https://chotrin.org/writing/2023-10-20.html target=_blank rel=noopener>OpenBSD upgrade and fall things.</a><div>Been AFK for a bit. It's autumn and I upgraded this server to OpenBSD 7.4! — <a href=https://chotrin.org>chötrin's wiki.</a><li><a href=https://mirzapandzo.com/next-image-url-parameter-is-valid-but-upstream-response-is-invalid target=_blank rel=noopener>Next/Image "url" parameter is valid but upstream response is invalid</a><div>Getting "url" parameter is valid but upstream response is invalid error with Next/Image on WSL2 — <a href=https://mirzapandzo.com/>Mirza Pandzo's Blog</a><li><a href=https://drewdevault.com/2023/10/13/Going-off-script.html target=_blank rel=noopener>Going off-script</a><div>There is a phenomenon in society which I find quite bizarre. Upon our entry to
36this mortal coil, we are endowed with self-awareness, agency, and free will.
37Each of th… — <a href=https://drewdevault.com>Drew DeVault's blog</a><li><a href=https://solar.lowtechmagazine.com/2023/10/workshop-in-rotterdam-how-to-build-a-bike-generator/ target=_blank rel=noopener>Workshop in Rotterdam: How to Build a Bike Generator</a><div>Afbeelding: Low-tech Magazine workshop in Rotterdam, the Netherlands. Poster: Marie Verdeil. Image: Sara Vercauteren
38The workshop takes place on behalf of the “Hou… — <a href=https://solar.lowtechmagazine.com/posts/>LOW←TECH MAGAZINE English</a><li><a href="http://offbeatpursuit.com:80/blog/?id=24" target=_blank rel=noopener>Printf debugging</a><div>tags:
39plan9
40There’s no shame in that. Yes, there is documentation, code to be
41read, and debuggers to be used. But sometimes you just need to “see”
42what is happening.
43So… — <a href=http://offbeatpursuit.com:80/blog/>WLOG - blog</a><li><a href=https://neil.computer/notes/chart-of-accounts-for-startups-and-saas-companies/ target=_blank rel=noopener>Chart of Accounts for Startups and SaaS Companies</a><div>Accounting is fundamental to starting a business. You need to have a basic understanding of accounting principles and essential bookkeeping. I had to learn it. Ther… — <a href=https://neil.computer/>Neil Panchal</a><li><a href=https://journal.valeriansaliou.name/deploy-a-nomad-cluster-on-alpine-linux-with-vultr/ target=_blank rel=noopener>Deploy a Nomad Cluster on Alpine Linux with Vultr</a><div>After spending countless hours trying to understand how to deploy my apps on Kubernetes for the first time to host Mirage, an AI API service that I run, I ended up … — <a href=https://journal.valeriansaliou.name/>Valerian Saliou</a><li><a href=https://jcs.org/2023/10/17/wikipedia target=_blank rel=noopener>Wikipedia Reader 1.0 Released</a><div>Wikipedia Reader
441.0 has been released:
45wikipedia-1.0.sit
46(StuffIt 3 archive, includes
47source code
48and THINK C 5 project file)
49SHA256: 360e12d064f6579695f1e627ce34cb2f0… — <a href=https://jcs.org/>joshua stein</a></ul><p><a href=https://git.sr.ht/~sircmpwn/openring>Generated with openring.</a></section><footer><hr><p><big><strong>Want to comment or have something to add?</strong></big><p>You can write me an email
50at <a href=mailto:m@mitjafelicijan.com>m@mitjafelicijan.com</a> or
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