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| <h3 class="section">2.26 <code>mblen</code>—minimal multibyte length function</h3> |
| |
| <p><a name="index-mblen-57"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <stdlib.h> |
| int mblen(const char *<var>s</var>, size_t <var>n</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| When _MB_CAPABLE is not defined, this is a minimal ANSI-conforming |
| implementation of <code>mblen</code>. In this case, the |
| only “multi-byte character sequences” recognized are single bytes, |
| and thus <code>1</code> is returned unless <var>s</var> is the null pointer or |
| has a length of 0 or is the empty string. |
| |
| <p>When _MB_CAPABLE is defined, this routine calls <code>_mbtowc_r</code> to perform |
| the conversion, passing a state variable to allow state dependent |
| decoding. The result is based on the locale setting which may |
| be restricted to a defined set of locales. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| This implementation of <code>mblen</code> returns <code>0</code> if |
| <var>s</var> is <code>NULL</code> or the empty string; it returns <code>1</code> if not _MB_CAPABLE or |
| the character is a single-byte character; it returns <code>-1</code> |
| if the multi-byte character is invalid; otherwise it returns |
| the number of bytes in the multibyte character. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| <code>mblen</code> is required in the ANSI C standard. However, the precise |
| effects vary with the locale. |
| |
| <p><code>mblen</code> requires no supporting OS subroutines. |
| |
| <p><br> |
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