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diff --git a/devdocs/c/string%2Fmultibyte%2Fbtowc.html b/devdocs/c/string%2Fmultibyte%2Fbtowc.html new file mode 100644 index 00000000..a30db92f --- /dev/null +++ b/devdocs/c/string%2Fmultibyte%2Fbtowc.html @@ -0,0 +1,57 @@ + <h1 id="firstHeading" class="firstHeading">btowc</h1> <table class="t-dcl-begin"> <tr class="t-dsc-header"> <th> Defined in header <code><wchar.h></code> </th> <th> </th> <th> </th> </tr> <tr class="t-dcl"> <td> <pre data-language="c">wint_t btowc( int c );</pre> +</td> <td class="t-dcl-nopad"> </td> <td> <span class="t-mark-rev t-since-c95">(since C95)</span> </td> </tr> </table> <p>Widens a single-byte character <code>c</code> (reinterpreted as <code>unsigned char</code>) to its wide character equivalent.</p> +<p>Most multibyte character encodings use single-byte codes to represent the characters from the ASCII character set. This function may be used to convert such characters to <code>wchar_t</code>.</p> +<h3 id="Parameters"> Parameters</h3> <table class="t-par-begin"> <tr class="t-par"> <td> c </td> <td> - </td> <td> single-byte character to widen </td> +</tr> +</table> <h3 id="Return_value"> Return value</h3> <p><code>WEOF</code> if <code>c</code> is <code><a href="../../io" title="c/io">EOF</a></code></p> +<p>wide character representation of <code>c</code> if <code>(unsigned char)c</code> is a valid single-byte character in the initial shift state, <code>WEOF</code> otherwise.</p> +<h3 id="Example"> Example</h3> <div class="t-example"> <div class="c source-c"><pre data-language="c">#include <stdio.h> +#include <wchar.h> +#include <locale.h> +#include <assert.h> + +void try_widen(unsigned char c) +{ + wint_t w = btowc(c); + if(w != WEOF) + printf("The single-byte character %#x widens to %#x\n", c, w); + else + printf("The single-byte character %#x failed to widen\n", c); +} + +int main(void) +{ + char *loc = setlocale(LC_ALL, "lt_LT.iso88594"); + assert(loc); + printf("In Lithuanian ISO-8859-4 locale:\n"); + try_widen('A'); + try_widen('\xdf'); // German letter ß (U+00df) in ISO-8859-4 + try_widen('\xf9'); // Lithuanian letter ų (U+0173) in ISO-8859-4 + + setlocale(LC_ALL, "lt_LT.utf8"); + printf("In Lithuanian UTF-8 locale:\n"); + try_widen('A'); + try_widen('\xdf'); + try_widen('\xf9'); +}</pre></div> <p>Possible output:</p> +<div class="text source-text"><pre data-language="c">In Lithuanian ISO-8859-4 locale: +The single-byte character 0x41 widens to 0x41 +The single-byte character 0xdf widens to 0xdf +The single-byte character 0xf9 widens to 0x173 +In Lithuanian UTF-8 locale: +The single-byte character 0x41 widens to 0x41 +The single-byte character 0xdf failed to widen +The single-byte character 0xf9 failed to widen</pre></div> </div> <h3 id="References"> References</h3> <ul> +<li> C11 standard (ISO/IEC 9899:2011): </li> +<ul><li> 7.29.6.1.1 The btowc function (p: 441) </li></ul> +<li> C99 standard (ISO/IEC 9899:1999): </li> +<ul><li> 7.24.6.1.1 The btowc function (p: 387) </li></ul> +</ul> <h3 id="See_also"> See also</h3> <table class="t-dsc-begin"> <tr class="t-dsc"> <td> <div><a href="wctob" title="c/string/multibyte/wctob"> <span class="t-lines"><span>wctob</span></span></a></div> +<div><span class="t-lines"><span><span class="t-mark-rev t-since-c95">(C95)</span></span></span></div> </td> <td> narrows a wide character to a single-byte narrow character, if possible <br> <span class="t-mark">(function)</span> </td> +</tr> <tr class="t-dsc"> <td colspan="2"> <span><a href="https://en.cppreference.com/w/cpp/string/multibyte/btowc" title="cpp/string/multibyte/btowc">C++ documentation</a></span> for <code>btowc</code> </td> +</tr> </table> <div class="_attribution"> + <p class="_attribution-p"> + © cppreference.com<br>Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.<br> + <a href="https://en.cppreference.com/w/c/string/multibyte/btowc" class="_attribution-link">https://en.cppreference.com/w/c/string/multibyte/btowc</a> + </p> +</div> |