devdocs/elisp/format-conversion-overview.html


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 <h4 class="subsection">Overview</h4> <p>The function <code>insert-file-contents</code>: </p> <ul> <li> initially, inserts bytes from the file into the buffer; </li>
<li> decodes bytes to characters as appropriate; </li>
<li> processes formats as defined by entries in <code>format-alist</code>; and </li>
<li> calls functions in <code>after-insert-file-functions</code>. </li>
</ul> <p>The function <code>write-region</code>: </p> <ul> <li> initially, calls functions in <code>write-region-annotate-functions</code>; </li>
<li> processes formats as defined by entries in <code>format-alist</code>; </li>
<li> encodes characters to bytes as appropriate; and </li>
<li> modifies the file with the bytes. </li>
</ul> <p>This shows the symmetry of the lowest-level operations; reading and writing handle things in opposite order. The rest of this section describes the two facilities surrounding the three variables named above, as well as some related functions. <a href="coding-systems">Coding Systems</a>, for details on character encoding and decoding. </p><div class="_attribution">
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    Copyright &copy; 1990-1996, 1998-2022 Free Software Foundation, Inc. <br>Licensed under the GNU GPL license.<br>
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