devdocs/elisp/coding-systems.html


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 <h3 class="section">Coding Systems</h3>  <p>When Emacs reads or writes a file, and when Emacs sends text to a subprocess or receives text from a subprocess, it normally performs character code conversion and end-of-line conversion as specified by a particular <em>coding system</em>. </p> <p>How to define a coding system is an arcane matter, and is not documented here. </p> <table class="menu" border="0" cellspacing="0"> <tr>
<td align="left" valign="top">• <a href="coding-system-basics" accesskey="1">Coding System Basics</a>
</td>
<td> </td>
<td align="left" valign="top">Basic concepts. </td>
</tr> <tr>
<td align="left" valign="top">• <a href="encoding-and-i_002fo" accesskey="2">Encoding and I/O</a>
</td>
<td> </td>
<td align="left" valign="top">How file I/O functions handle coding systems. </td>
</tr> <tr>
<td align="left" valign="top">• <a href="lisp-and-coding-systems" accesskey="3">Lisp and Coding Systems</a>
</td>
<td> </td>
<td align="left" valign="top">Functions to operate on coding system names. </td>
</tr> <tr>
<td align="left" valign="top">• <a href="user_002dchosen-coding-systems" accesskey="4">User-Chosen Coding Systems</a>
</td>
<td> </td>
<td align="left" valign="top">Asking the user to choose a coding system. </td>
</tr> <tr>
<td align="left" valign="top">• <a href="default-coding-systems" accesskey="5">Default Coding Systems</a>
</td>
<td> </td>
<td align="left" valign="top">Controlling the default choices. </td>
</tr> <tr>
<td align="left" valign="top">• <a href="specifying-coding-systems" accesskey="6">Specifying Coding Systems</a>
</td>
<td> </td>
<td align="left" valign="top">Requesting a particular coding system for a single file operation. </td>
</tr> <tr>
<td align="left" valign="top">• <a href="explicit-encoding" accesskey="7">Explicit Encoding</a>
</td>
<td> </td>
<td align="left" valign="top">Encoding or decoding text without doing I/O. </td>
</tr> <tr>
<td align="left" valign="top">• <a href="terminal-i_002fo-encoding" accesskey="8">Terminal I/O Encoding</a>
</td>
<td> </td>
<td align="left" valign="top">Use of encoding for terminal I/O. </td>
</tr> </table><div class="_attribution">
  <p class="_attribution-p">
    Copyright &copy; 1990-1996, 1998-2022 Free Software Foundation, Inc. <br>Licensed under the GNU GPL license.<br>
    <a href="https://www.gnu.org/software/emacs/manual/html_node/elisp/Coding-Systems.html" class="_attribution-link">https://www.gnu.org/software/emacs/manual/html_node/elisp/Coding-Systems.html</a>
  </p>
</div>