xbd_chap07.html

IEEE 1003.1-2003, Single Unix Specification v3

</pre>
</blockquote>

<p>shall be mapped to the corresponding 26 uppercase characters:</p>

<blockquote>
<pre>
<tt>A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
</tt>
</pre>
</blockquote>

<p>In a locale definition file, the operand shall consist of character pairs, separated by semicolons. The characters in each
character pair shall be separated by a comma and the pair enclosed by parentheses. The first character in each pair is the
lowercase letter, the second the corresponding uppercase letter. Only characters specified for the keywords <b>lower</b> and
<b>upper</b> shall be specified. The lowercase letters &lt;a&gt; to &lt;z&gt;, and their corresponding uppercase letters &lt;A&gt;
to &lt;Z&gt;, of the portable character set are automatically included in this mapping, but only when the <b>toupper</b> keyword is
omitted from the locale definition.</p>
</dd>

<dt><b>tolower</b></dt>

<dd>Define the mapping of uppercase letters to lowercase letters. 

<p>In the POSIX locale, at a minimum, the 26 uppercase characters:</p>

<blockquote>
<pre>
<tt>A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
</tt>
</pre>
</blockquote>

<p>shall be mapped to the corresponding 26 lowercase characters:</p>

<blockquote>
<pre>
<tt>a b c d e f g h i j k l m n o p q r s t u v w x y z
</tt>
</pre>
</blockquote>

<p>In a locale definition file, the operand shall consist of character pairs, separated by semicolons. The characters in each
character pair shall be separated by a comma and the pair enclosed by parentheses. The first character in each pair is the
uppercase letter, the second the corresponding lowercase letter. Only characters specified for the keywords <b>lower</b> and
<b>upper</b> shall be specified. If the <b>tolower</b> keyword is omitted from the locale definition, the mapping is the reverse
mapping of the one specified for <b>toupper</b>.</p>
</dd>
</dl>

<p>The following table shows the character class combinations allowed:<br>
</p>

<center><b><a name="tagtcjh_5"></a> Table: Valid Character Class Combinations</b></center>

<center>
<table cellpadding="3" align="center">
<tr valign="top">
<th align="left">
<p class="tent">&nbsp;</p>
</th>
<th align="center">
<p class="tent"><b>Can Also Belong To</b></p>
</th>
<th colspan="11" align="center">
<p class="tent"><b>&nbsp;</b></p>
</th>
</tr>

<tr valign="top">
<th align="left">
<p class="tent">&nbsp;</p>
</th>
<th align="center">
<p class="tent"><b>_</b></p>
</th>
<th colspan="11" align="center">
<p class="tent"><b>&nbsp;</b></p>
</th>
</tr>

<tr valign="top">
<th align="left">
<p class="tent">In Class</p>
</th>
<th align="center">
<p class="tent"><b>upper</b></p>
</th>
<th align="center">
<p class="tent"><b>lower</b></p>
</th>
<th align="center">
<p class="tent"><b>alpha</b></p>
</th>
<th align="center">
<p class="tent"><b>digit</b></p>
</th>
<th align="center">
<p class="tent"><b>space</b></p>
</th>
<th align="center">
<p class="tent"><b>cntrl</b></p>
</th>
<th align="center">
<p class="tent"><b>punct</b></p>
</th>
<th align="center">
<p class="tent"><b>graph</b></p>
</th>
<th align="center">
<p class="tent"><b>print</b></p>
</th>
<th align="center">
<p class="tent"><b>xdigit</b></p>
</th>
<th align="center">
<p class="tent"><b>blank</b></p>
</th>
<th align="center">
<p class="tent"><b>&nbsp;</b></p>
</th>
</tr>

<tr valign="top">
<td align="left">
<p class="tent">upper</p>
</td>
<td align="left">
<p class="tent"><b></b></p>
</td>
<td align="center">
<p class="tent">-</p>
</td>
<td align="center">
<p class="tent">A</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">A</p>
</td>
<td align="center">
<p class="tent">A</p>
</td>
<td align="center">
<p class="tent">-</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">&nbsp;</p>
</td>
</tr>

<tr valign="top">
<td align="left">
<p class="tent">lower</p>
</td>
<td align="left">
<p class="tent"><b>-</b></p>
</td>
<td align="center">
<p class="tent"></p>
</td>
<td align="center">
<p class="tent">A</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">A</p>
</td>
<td align="center">
<p class="tent">A</p>
</td>
<td align="center">
<p class="tent">-</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">&nbsp;</p>
</td>
</tr>

<tr valign="top">
<td align="left">
<p class="tent">alpha</p>
</td>
<td align="left">
<p class="tent"><b>-</b></p>
</td>
<td align="center">
<p class="tent">-</p>
</td>
<td align="center">
<p class="tent"></p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">A</p>
</td>
<td align="center">
<p class="tent">A</p>
</td>
<td align="center">
<p class="tent">-</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">&nbsp;</p>
</td>
</tr>

<tr valign="top">
<td align="left">
<p class="tent">digit</p>
</td>
<td align="left">
<p class="tent"><b>x</b></p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent"></p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">A</p>
</td>
<td align="center">
<p class="tent">A</p>
</td>
<td align="center">
<p class="tent">A</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">&nbsp;</p>
</td>
</tr>

<tr valign="top">
<td align="left">
<p class="tent">space</p>
</td>
<td align="left">
<p class="tent"><b>x</b></p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent"></p>
</td>
<td align="center">
<p class="tent">-</p>
</td>
<td align="center">
<p class="tent">*</p>
</td>
<td align="center">
<p class="tent">*</p>
</td>
<td align="center">
<p class="tent">*</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">-</p>
</td>
<td align="center">
<p class="tent">&nbsp;</p>
</td>
</tr>

<tr valign="top">
<td align="left">
<p class="tent">cntrl</p>
</td>
<td align="left">
<p class="tent"><b>x</b></p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">-</p>
</td>
<td align="center">
<p class="tent"></p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">-</p>
</td>
<td align="center">
<p class="tent">&nbsp;</p>
</td>
</tr>

<tr valign="top">
<td align="left">
<p class="tent">punct</p>
</td>
<td align="left">
<p class="tent"><b>x</b></p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">-</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent"></p>
</td>
<td align="center">
<p class="tent">A</p>
</td>
<td align="center">
<p class="tent">A</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">-</p>
</td>
<td align="center">
<p class="tent">&nbsp;</p>
</td>
</tr>

<tr valign="top">
<td align="left">
<p class="tent">graph</p>
</td>
<td align="left">
<p class="tent"><b>-</b></p>
</td>
<td align="center">
<p class="tent">-</p>
</td>
<td align="center">
<p class="tent">-</p>
</td>
<td align="center">
<p class="tent">-</p>
</td>
<td align="center">
<p class="tent">-</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">-</p>
</td>
<td align="center">
<p class="tent"></p>
</td>
<td align="center">
<p class="tent">A</p>
</td>
<td align="center">
<p class="tent">-</p>
</td>
<td align="center">
<p class="tent">-</p>
</td>
<td align="center">
<p class="tent">&nbsp;</p>
</td>
</tr>

<tr valign="top">
<td align="left">
<p class="tent">print</p>
</td>
<td align="left">
<p class="tent"><b>-</b></p>
</td>
<td align="center">
<p class="tent">-</p>
</td>
<td align="center">
<p class="tent">-</p>
</td>
<td align="center">
<p class="tent">-</p>
</td>
<td align="center">
<p class="tent">-</p>
</td>
<td align="center">
<p class="tent">x</p>
</td>
<td align="center">
<p class="tent">-</p>
</td>
<td align="center">
<p class="tent">-</p>
</td>
<td align="center">
<p class="tent"></p>
</td>
<td align="center">
<p class="tent">-</p>
</td>
<td align="center">
<p class="tent">-</p>
</td>
<td align="center">
<p class="tent">&nbsp;</p>
</td>
</tr>

<tr valign="top">
<td align="left">
<p class="tent">xdigit</p>
</td>
<td align="left">
<p class="tent"><b>-</b></p>
</td>
<td align="center">
<p class="tent">-</p>
</td>
<td align="center">
<p class="tent">-</p>
</td>
<td align="center">
<p class="tent">-</p>
</td>
<td align="center">