選択できるのは25トピックまでです。 トピックは、先頭が英数字で、英数字とダッシュ('-')を使用した35文字以内のものにしてください。

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106
  1. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
  2. <html>
  3. <!-- Created by GNU Texinfo 6.5, http://www.gnu.org/software/texinfo/ -->
  4. <head>
  5. <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
  6. <title>mbtowc (The Red Hat newlib C Library)</title>
  7. <meta name="description" content="mbtowc (The Red Hat newlib C Library)">
  8. <meta name="keywords" content="mbtowc (The Red Hat newlib C Library)">
  9. <meta name="resource-type" content="document">
  10. <meta name="distribution" content="global">
  11. <meta name="Generator" content="makeinfo">
  12. <link href="index.html#Top" rel="start" title="Top">
  13. <link href="Document-Index.html#Document-Index" rel="index" title="Document Index">
  14. <link href="Document-Index.html#SEC_Contents" rel="contents" title="Table of Contents">
  15. <link href="Stdlib.html#Stdlib" rel="up" title="Stdlib">
  16. <link href="on_005fexit.html#on_005fexit" rel="next" title="on_exit">
  17. <link href="mbstowcs.html#mbstowcs" rel="prev" title="mbstowcs">
  18. <style type="text/css">
  19. <!--
  20. a.summary-letter {text-decoration: none}
  21. blockquote.indentedblock {margin-right: 0em}
  22. blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
  23. blockquote.smallquotation {font-size: smaller}
  24. div.display {margin-left: 3.2em}
  25. div.example {margin-left: 3.2em}
  26. div.lisp {margin-left: 3.2em}
  27. div.smalldisplay {margin-left: 3.2em}
  28. div.smallexample {margin-left: 3.2em}
  29. div.smalllisp {margin-left: 3.2em}
  30. kbd {font-style: oblique}
  31. pre.display {font-family: inherit}
  32. pre.format {font-family: inherit}
  33. pre.menu-comment {font-family: serif}
  34. pre.menu-preformatted {font-family: serif}
  35. pre.smalldisplay {font-family: inherit; font-size: smaller}
  36. pre.smallexample {font-size: smaller}
  37. pre.smallformat {font-family: inherit; font-size: smaller}
  38. pre.smalllisp {font-size: smaller}
  39. span.nolinebreak {white-space: nowrap}
  40. span.roman {font-family: initial; font-weight: normal}
  41. span.sansserif {font-family: sans-serif; font-weight: normal}
  42. ul.no-bullet {list-style: none}
  43. -->
  44. </style>
  45. </head>
  46. <body lang="en">
  47. <a name="mbtowc"></a>
  48. <div class="header">
  49. <p>
  50. Next: <a href="on_005fexit.html#on_005fexit" accesskey="n" rel="next">on_exit</a>, Previous: <a href="mbstowcs.html#mbstowcs" accesskey="p" rel="prev">mbstowcs</a>, Up: <a href="Stdlib.html#Stdlib" accesskey="u" rel="up">Stdlib</a> &nbsp; [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
  51. </div>
  52. <hr>
  53. <a name="mbtowc_002d_002d_002dminimal-multibyte-to-wide-char-converter"></a>
  54. <h3 class="section">2.30 <code>mbtowc</code>&mdash;minimal multibyte to wide char converter</h3>
  55. <a name="index-mbtowc"></a>
  56. <p><strong>Synopsis</strong>
  57. </p><div class="example">
  58. <pre class="example">#include &lt;stdlib.h&gt;
  59. int mbtowc(wchar_t *restrict <var>pwc</var>, const char *restrict <var>s</var>, size_t <var>n</var>);
  60. </pre></div>
  61. <p><strong>Description</strong><br>
  62. When _MB_CAPABLE is not defined, this is a minimal ANSI-conforming
  63. implementation of <code>mbtowc</code>. In this case,
  64. only &ldquo;multi-byte character sequences&rdquo; recognized are single bytes,
  65. and they are &ldquo;converted&rdquo; to themselves.
  66. Each call to <code>mbtowc</code> copies one character from <code>*<var>s</var></code> to
  67. <code>*<var>pwc</var></code>, unless <var>s</var> is a null pointer. The argument n
  68. is ignored.
  69. </p>
  70. <p>When _MB_CAPABLE is defined, this routine calls <code>_mbtowc_r</code> to perform
  71. the conversion, passing a state variable to allow state dependent
  72. decoding. The result is based on the locale setting which may
  73. be restricted to a defined set of locales.
  74. </p>
  75. <br>
  76. <p><strong>Returns</strong><br>
  77. This implementation of <code>mbtowc</code> returns <code>0</code> if
  78. <var>s</var> is <code>NULL</code> or is the empty string;
  79. it returns <code>1</code> if not _MB_CAPABLE or
  80. the character is a single-byte character; it returns <code>-1</code>
  81. if n is <code>0</code> or the multi-byte character is invalid;
  82. otherwise it returns the number of bytes in the multibyte character.
  83. If the return value is -1, no changes are made to the <code>pwc</code>
  84. output string. If the input is the empty string, a wchar_t nul
  85. is placed in the output string and 0 is returned. If the input
  86. has a length of 0, no changes are made to the <code>pwc</code> output string.
  87. </p>
  88. <br>
  89. <p><strong>Portability</strong><br>
  90. <code>mbtowc</code> is required in the ANSI C standard. However, the precise
  91. effects vary with the locale.
  92. </p>
  93. <p><code>mbtowc</code> requires no supporting OS subroutines.
  94. </p>
  95. <br>
  96. </body>
  97. </html>