38 lines
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2.1 KiB
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38 lines
No EOL
2.1 KiB
HTML
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>read_char — Ludic</title>
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<meta name="description" content="Read one byte from standard input, or -1 at end of input.">
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<header class="nav"><div class="wrap nav-in"><a class="brand" href="index.html"><span class="logo">L</span> Ludic</a><button class="nav-toggle" aria-label="Toggle menu" aria-expanded="false">☰</button><nav class="nav-links"><a href="index.html">Home</a><a href="api.html">API Reference</a><a class="nav-cta" href="https://git.workshopsoft.io/workshopsoft/ludic">Source ↗</a></nav></div></header>
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<div class="crumbs"><a href="api.html">API Reference</a> <span>›</span> <a href="api.html#builtins">Builtin functions</a> <span>›</span> <span class="here">read_char</span></div>
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<div class="item-head">
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<span class="kind-badge kind-builtin">function</span>
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<h1 id="top">read_char</h1>
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</div>
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<code class="sig">read_char() -> int</code>
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<div class="desc"><p>Reads a single byte from standard input and returns its value, or <code>-1</code> when the input has ended. It is the foundation for headless, pipe-driven runs: a test or tool can feed the program a stream of bytes and process them one at a time, looping until <code>read_char</code> returns <code>-1</code>. Compare the byte against character literals such as <code>'a'</code> to interpret it. It takes no arguments and advances through the input on each call.</p></div>
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<div class="examples"><h2>Example</h2><pre data-lang="ludic">program CountInputBytes {
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handler DrainInput phase Start {
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var byte_count: int = 0
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var next_byte = read_char()
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while next_byte != -1 {
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byte_count = byte_count + 1
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next_byte = read_char()
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}
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print(byte_count)
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}
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}</pre></div>
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