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<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>cygwin_conv_path</title><link rel="stylesheet" type="text/css" href="docbook.css"><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot"><link rel="home" href="cygwin-api.html" title="Cygwin API Reference"><link rel="up" href="cygwin-functions.html#func-cygwin-path" title="Path conversion functions"><link rel="prev" href="cygwin-functions.html" title="Chapter 2. Cygwin Functions"><link rel="next" href="func-cygwin-conv-path-list.html" title="cygwin_conv_path_list"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">cygwin_conv_path</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="cygwin-functions.html">Prev</a> </td><th width="60%" align="center">Path conversion functions</th><td width="20%" align="right"> <a accesskey="n" href="func-cygwin-conv-path-list.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="func-cygwin-conv-path"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>cygwin_conv_path</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><pre class="funcsynopsisinfo">
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#include <sys/cygwin.h>
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</pre><p><code class="funcdef">ssize_t
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<b class="fsfunc">cygwin_conv_path</b>(</code>cygwin_conv_path_t <var class="pdparam">what</var>, const void * <var class="pdparam">from</var>, void * <var class="pdparam">to</var>, size_t <var class="pdparam">size</var><code>)</code>;</p></div></div><div class="refsect1"><a name="func-cygwin-conv-path-desc"></a><h2>Description</h2><p>Use this function to convert POSIX paths in
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<em class="parameter"><code>from</code></em> to Win32 paths in <em class="parameter"><code>to</code></em>
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or, vice versa, Win32 paths in <em class="parameter"><code>from</code></em> to POSIX paths
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in <em class="parameter"><code>to</code></em>. <em class="parameter"><code>what</code></em>
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defines the direction of this conversion and can be any of the below
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values.</p><pre class="programlisting">
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CCP_POSIX_TO_WIN_A /* from is char *posix, to is char *win32 */
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CCP_POSIX_TO_WIN_W, /* from is char *posix, to is wchar_t *win32 */
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CCP_WIN_A_TO_POSIX, /* from is char *win32, to is char *posix */
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CCP_WIN_W_TO_POSIX, /* from is wchar_t *win32, to is char *posix */
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</pre><p>You can additionally or the following values to
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<em class="parameter"><code>what</code></em>, to define whether you want the resulting
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path in <em class="parameter"><code>to</code></em> to be absolute or if you want to keep
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relative paths in relative notation. Creating absolute paths is the
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default.</p><pre class="programlisting">
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CCP_ABSOLUTE = 0, /* Request absolute path (default). */
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CCP_RELATIVE = 0x100 /* Request to keep path relative. */
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CCP_PROC_CYGDRIVE = 0x200 /* Request to return /proc/cygdrive path
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(only with CCP_*_TO_POSIX). */
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</pre><p><em class="parameter"><code>size</code></em> is the size of the buffer pointed to
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by <em class="parameter"><code>to</code></em> in bytes. If <em class="parameter"><code>size</code></em>
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is 0, <code class="function">cygwin_conv_path</code> just returns the required
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buffer size in bytes. Otherwise, it returns 0 on success, or -1 on
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error and errno is set to one of the below values.</p><pre class="programlisting">
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EINVAL what has an invalid value or from is NULL.
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EFAULT from or to point into nirvana.
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ENAMETOOLONG the resulting path is longer than 32K, or, in case
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of what == CCP_POSIX_TO_WIN_A, longer than MAX_PATH.
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ENOSPC size is less than required for the conversion.
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</pre></div><div class="refsect1"><a name="func-cygwin-conv-path-example"></a><h2>Example</h2><div class="example"><a name="func-cygwin-conv-path-example-example"></a><p class="title"><b>Example 2.1. Example use of cygwin_conv_path</b></p><div class="example-contents"><pre class="programlisting">
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#include <sys/cygwin.h>
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/* Conversion from incoming Win32 path given as wchar_t *win32 to POSIX path.
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If incoming path is a relative path, stick to it. First ask how big
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the output buffer has to be and allocate space dynamically. */
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ssize_t size;
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char *posix;
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size = cygwin_conv_path (CCP_WIN_W_TO_POSIX | CCP_RELATIVE, win32, NULL, 0);
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if (size < 0)
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perror ("cygwin_conv_path");
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else
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{
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posix = (char *) malloc (size);
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if (cygwin_conv_path (CCP_WIN_W_TO_POSIX | CCP_RELATIVE, win32,
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posix, size))
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perror ("cygwin_conv_path");
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}
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</pre></div></div><br class="example-break"></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="cygwin-functions.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="cygwin-functions.html#func-cygwin-path">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="func-cygwin-conv-path-list.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 2. Cygwin Functions </td><td width="20%" align="center"><a accesskey="h" href="cygwin-api.html">Home</a></td><td width="40%" align="right" valign="top"> cygwin_conv_path_list</td></tr></table></div></body></html>
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