<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <!-- Created by GNU Texinfo 6.5, http://www.gnu.org/software/texinfo/ --> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>wcstoul (The Red Hat newlib C Library)</title> <meta name="description" content="wcstoul (The Red Hat newlib C Library)"> <meta name="keywords" content="wcstoul (The Red Hat newlib C Library)"> <meta name="resource-type" content="document"> <meta name="distribution" content="global"> <meta name="Generator" content="makeinfo"> <link href="index.html#Top" rel="start" title="Top"> <link href="Document-Index.html#Document-Index" rel="index" title="Document Index"> <link href="Document-Index.html#SEC_Contents" rel="contents" title="Table of Contents"> <link href="Stdlib.html#Stdlib" rel="up" title="Stdlib"> <link href="wcstoull.html#wcstoull" rel="next" title="wcstoull"> <link href="wcstoll.html#wcstoll" rel="prev" title="wcstoll"> <style type="text/css"> <!-- a.summary-letter {text-decoration: none} blockquote.indentedblock {margin-right: 0em} blockquote.smallindentedblock {margin-right: 0em; font-size: smaller} blockquote.smallquotation {font-size: smaller} div.display {margin-left: 3.2em} div.example {margin-left: 3.2em} div.lisp {margin-left: 3.2em} div.smalldisplay {margin-left: 3.2em} div.smallexample {margin-left: 3.2em} div.smalllisp {margin-left: 3.2em} kbd {font-style: oblique} pre.display {font-family: inherit} pre.format {font-family: inherit} pre.menu-comment {font-family: serif} pre.menu-preformatted {font-family: serif} pre.smalldisplay {font-family: inherit; font-size: smaller} pre.smallexample {font-size: smaller} pre.smallformat {font-family: inherit; font-size: smaller} pre.smalllisp {font-size: smaller} span.nolinebreak {white-space: nowrap} span.roman {font-family: initial; font-weight: normal} span.sansserif {font-family: sans-serif; font-weight: normal} ul.no-bullet {list-style: none} --> </style> </head> <body lang="en"> <a name="wcstoul"></a> <div class="header"> <p> Next: <a href="wcstoull.html#wcstoull" accesskey="n" rel="next">wcstoull</a>, Previous: <a href="wcstoll.html#wcstoll" accesskey="p" rel="prev">wcstoll</a>, Up: <a href="Stdlib.html#Stdlib" accesskey="u" rel="up">Stdlib</a> [<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> </div> <hr> <a name="wcstoul_002c-wcstoul_005fl_002d_002d_002dwide-string-to-unsigned-long"></a> <h3 class="section">2.46 <code>wcstoul</code>, <code>wcstoul_l</code>—wide string to unsigned long</h3> <a name="index-wcstoul"></a> <a name="index-wcstoul_005fl"></a> <a name="index-_005fwcstoul_005fr"></a> <p><strong>Synopsis</strong> </p><div class="example"> <pre class="example">#include <wchar.h> unsigned long wcstoul(const wchar_t *__restrict <var>s</var>, wchar_t **__restrict <var>ptr</var>, int <var>base</var>); #include <wchar.h> unsigned long wcstoul_l(const wchar_t *__restrict <var>s</var>, wchar_t **__restrict <var>ptr</var>, int <var>base</var>, locale_t <var>locale</var>); unsigned long _wcstoul_r(void *<var>reent</var>, const wchar_t *<var>s</var>, wchar_t **<var>ptr</var>, int <var>base</var>); </pre></div> <p><strong>Description</strong><br> The function <code>wcstoul</code> converts the wide string <code>*<var>s</var></code> to an <code>unsigned long</code>. First, it breaks down the string into three parts: leading whitespace, which is ignored; a subject string consisting of the digits meaningful in the radix specified by <var>base</var> (for example, <code>0</code> through <code>7</code> if the value of <var>base</var> is 8); and a trailing portion consisting of one or more unparseable characters, which always includes the terminating null character. Then, it attempts to convert the subject string into an unsigned long integer, and returns the result. </p> <p>If the value of <var>base</var> is zero, the subject string is expected to look like a normal C integer constant (save that no optional sign is permitted): a possible <code>0x</code> indicating hexadecimal radix, and a number. If <var>base</var> is between 2 and 36, the expected form of the subject is a sequence of digits (which may include letters, depending on the base) representing an integer in the radix specified by <var>base</var>. The letters <code>a</code>–<code>z</code> (or <code>A</code>–<code>Z</code>) are used as digits valued from 10 to 35. If <var>base</var> is 16, a leading <code>0x</code> is permitted. </p> <p>The subject sequence is the longest initial sequence of the input string that has the expected form, starting with the first non-whitespace character. If the string is empty or consists entirely of whitespace, or if the first non-whitespace character is not a permissible digit, the subject string is empty. </p> <p>If the subject string is acceptable, and the value of <var>base</var> is zero, <code>wcstoul</code> attempts to determine the radix from the input string. A string with a leading <code>0x</code> is treated as a hexadecimal value; a string with a leading <code>0</code> and no <code>x</code> is treated as octal; all other strings are treated as decimal. If <var>base</var> is between 2 and 36, it is used as the conversion radix, as described above. Finally, a pointer to the first character past the converted subject string is stored in <var>ptr</var>, if <var>ptr</var> is not <code>NULL</code>. </p> <p>If the subject string is empty (that is, if <code>*</code><var>s</var> does not start with a substring in acceptable form), no conversion is performed and the value of <var>s</var> is stored in <var>ptr</var> (if <var>ptr</var> is not <code>NULL</code>). </p> <p>The alternate function <code>_wcstoul_r</code> is a reentrant version. The extra argument <var>reent</var> is a pointer to a reentrancy structure. </p> <p><code>wcstoul_l</code> is like <code>wcstoul</code> but performs the conversion based on the locale specified by the locale object locale. If <var>locale</var> is LC_GLOBAL_LOCALE or not a valid locale object, the behaviour is undefined. </p> <br> <p><strong>Returns</strong><br> <code>wcstoul</code>, <code>wcstoul_l</code> return the converted value, if any. If no conversion was made, <code>0</code> is returned. </p> <p><code>wcstoul</code>, <code>wcstoul_l</code> return <code>ULONG_MAX</code> if the magnitude of the converted value is too large, and sets <code>errno</code> to <code>ERANGE</code>. </p> <br> <p><strong>Portability</strong><br> <code>wcstoul</code> is ANSI. <code>wcstoul_l</code> is a GNU extension. </p> <p><code>wcstoul</code> requires no supporting OS subroutines. </p> <br> <hr> <div class="header"> <p> Next: <a href="wcstoull.html#wcstoull" accesskey="n" rel="next">wcstoull</a>, Previous: <a href="wcstoll.html#wcstoll" accesskey="p" rel="prev">wcstoll</a>, Up: <a href="Stdlib.html#Stdlib" accesskey="u" rel="up">Stdlib</a> [<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> </div> </body> </html>