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copied!<p>If you want to write a standard C version of the <code>wc</code> utility that respects the current language setting when it is run, then you can indeed use the <code>wchar_t</code> versions of the stdio functions. At program startup, you should call <code>setlocale()</code>:</p> <pre><code>setlocale(LC_CTYPE, ""); </code></pre> <p>This will cause the wide character functions to use the appropriate character set defined by the environment - eg. on Unix-like systems, the <code>LANG</code> environment variable. For example, this means that if your <code>LANG</code> variable is set to a <code>UTF8</code> locale, the wide character functions will handle input and output in UTF8. (This is how the POSIX <code>wc</code> utility is specified to work).</p> <p>You can then use the wide-character versions of all the standard functions. For example, if you have code like this:</p> <pre><code>long words = 0; int in_word = 0; int c; while ((c = getchar()) != EOF) { if (isspace(c)) { if (in_word) { in_word = 0; words++; } } else { in_word = 1; } } </code></pre> <p>...you would convert it to the wide character version by changing <code>c</code> to a <code>wint_t</code>, <code>getchar()</code> to <code>getwchar()</code>, <code>EOF</code> to <code>WEOF</code> and <code>isspace()</code> to <code>iswspace()</code>:</p> <pre><code>long words = 0; int in_word = 0; wint_t c; while ((c = getwchar()) != WEOF) { if (iswspace(c)) { if (in_word) { in_word = 0; words++; } } else { in_word = 1; } } </code></pre>

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