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95 lines
3.7 KiB
HTML
95 lines
3.7 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>getline (The Red Hat newlib C Library)</title>
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<meta name="description" content="getline (The Red Hat newlib C Library)">
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<meta name="keywords" content="getline (The Red Hat newlib C Library)">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Document-Index.html#Document-Index" rel="index" title="Document Index">
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<link href="Document-Index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Stdio.html#Stdio" rel="up" title="Stdio">
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<link href="gets.html#gets" rel="next" title="gets">
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<link href="getdelim.html#getdelim" rel="prev" title="getdelim">
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</head>
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<body lang="en">
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<a name="getline"></a>
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<div class="header">
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<p>
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Next: <a href="gets.html#gets" accesskey="n" rel="next">gets</a>, Previous: <a href="getdelim.html#getdelim" accesskey="p" rel="prev">getdelim</a>, Up: <a href="Stdio.html#Stdio" accesskey="u" rel="up">Stdio</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="getline_002d_002d_002dread-a-line-from-a-file"></a>
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<h3 class="section">4.38 <code>getline</code>—read a line from a file</h3>
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<a name="index-getline"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">#include <stdio.h>
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ssize_t getline(char **<var>bufptr</var>, size_t *<var>n</var>, FILE *<var>fp</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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<code>getline</code> reads a file <var>fp</var> up to and possibly including the
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newline character. The line is read into a buffer pointed to
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by <var>bufptr</var> and designated with size *<var>n</var>. If the buffer is
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not large enough, it will be dynamically grown by <code>getdelim</code>.
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As the buffer is grown, the pointer to the size <var>n</var> will be
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updated.
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</p>
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<p><code>getline</code> is equivalent to getdelim(bufptr, n, ’\n’, fp);
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</p>
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<br>
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<p><strong>Returns</strong><br>
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<code>getline</code> returns <code>-1</code> if no characters were successfully read,
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otherwise, it returns the number of bytes successfully read.
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at end of file, the result is nonzero.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>getline</code> is a glibc extension.
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</p>
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<p>No supporting OS subroutines are directly required.
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</p>
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<br>
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</body>
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</html>
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