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| <h3 class="section">2.29 <code>mbtowc</code>—minimal multibyte to wide char converter</h3> |
| |
| <p><a name="index-mbtowc-63"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <stdlib.h> |
| int mbtowc(wchar_t *<var>pwc</var>, 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>mbtowc</code>. In this case, |
| only “multi-byte character sequences” recognized are single bytes, |
| and they are “converted” to themselves. |
| Each call to <code>mbtowc</code> copies one character from <code>*</code><var>s</var> to |
| <code>*</code><var>pwc</var>, unless <var>s</var> is a null pointer. The argument n |
| is ignored. |
| |
| <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>mbtowc</code> returns <code>0</code> if |
| <var>s</var> is <code>NULL</code> or is 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 n is <code>0</code> or the multi-byte character is invalid; |
| otherwise it returns the number of bytes in the multibyte character. |
| If the return value is -1, no changes are made to the <code>pwc</code> |
| output string. If the input is the empty string, a wchar_t nul |
| is placed in the output string and 0 is returned. If the input |
| has a length of 0, no changes are made to the <code>pwc</code> output string. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| <code>mbtowc</code> is required in the ANSI C standard. However, the precise |
| effects vary with the locale. |
| |
| <p><code>mbtowc</code> requires no supporting OS subroutines. |
| |
| <p><br> |
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