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466
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1 <refentry id="toupper">
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2 <refnamediv>
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3 <refname>toupper</refname>
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4 <refpurpose>Placeholder</refpurpose>
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5 </refnamediv>
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6
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7 <refsynopsisdiv>
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8 <funcsynopsis>
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468
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9 <funcsynopsisinfo>
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10 #include <ctype.h>
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11 </funcsynopsisinfo>
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466
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12 <funcprototype>
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13 <funcdef><function>toupper</function></funcdef>
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474
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14 <paramdef>int <parameter>c</parameter></paramdef>
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15 </funcprototype>
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16 <funcprototype>
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17 <funcdef><function>tolower</function></funcdef>
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18 <paramdef>int <parameter>c</parameter></paramdef>
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19 </funcprototype>
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20 <funcprototype>
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21 <funcdef><function>_toupper</function></funcdef>
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22 <paramdef>int <parameter>c</parameter></paramdef>
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23 </funcprototype>
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24 <funcprototype>
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25 <funcdef><function>_tolower</function></funcdef>
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26 <paramdef>int <parameter>c</parameter></paramdef>
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466
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27 </funcprototype>
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28 </funcsynopsis>
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29
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30 </refsynopsisdiv>
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31
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32 <refsect1><title>Description</title>
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33 <para>
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474
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34 The functions toupper and tolower have as their domain the
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35 integers in the range -1 to 255. Toupper converts lower-case
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36 to upper-case, and tolower converts upper-case to lower-case.
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37 All other arguments are returned unchanged.
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38 </para>
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39 <para>
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40 The macros _toupper and _tolower do the same things as the
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41 corresponding functions, but they have restricted domains and
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42 they are faster. The argument to _toupper must be lower-case,
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43 and the argument to _tolower must be upper-case. Arguments
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44 that are outside each macros domain, such as passing a lower-case
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45 to _tolower, yield garbage results.
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466
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46 </para>
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47 </refsect1>
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48 </refentry>
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