197 lines
4.4 KiB
HTML
197 lines
4.4 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of WCSTOMBS</TITLE>
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</HEAD><BODY>
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<H1>WCSTOMBS</H1>
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Section: Linux Programmer's Manual (3)<BR>Updated: 2019-03-06<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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wcstombs - convert a wide-character string to a multibyte string
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<PRE>
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<B>#include <<A HREF="file:///usr/include/stdlib.h">stdlib.h</A>></B>
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<B>size_t wcstombs(char *</B><I>dest</I><B>, const wchar_t *</B><I>src</I><B>, size_t </B><I>n</I><B>);</B>
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</PRE>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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If
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<I>dest</I>
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is not NULL, the
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<B>wcstombs</B>()
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function converts
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the wide-character string
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<I>src</I>
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to a multibyte string starting at
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<I>dest</I>.
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At most
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<I>n</I>
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bytes are written to
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<I>dest</I>.
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The sequence of characters placed in
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<I>dest</I>
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begins in the initial shift state.
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The conversion can stop for three reasons:
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<DL COMPACT>
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<DT id="1">1.<DD>
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A wide character has been encountered that can not be represented as a
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multibyte sequence (according to the current locale).
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In this case,
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<I>(size_t) -1</I>
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is returned.
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<DT id="2">2.<DD>
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The length limit forces a stop.
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In this case, the number of bytes written to
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<I>dest</I>
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is returned, but the shift state at this point is lost.
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<DT id="3">3.<DD>
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The wide-character string has been completely converted, including the
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terminating null wide character (L'\0').
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In this case, the conversion ends in the initial shift state.
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The number of bytes written to
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<I>dest</I>,
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excluding the terminating null byte ('\0'), is returned.
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</DL>
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<P>
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The programmer must ensure that there is room for at least
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<I>n</I>
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bytes
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at
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<I>dest</I>.
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<P>
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If
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<I>dest</I>
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is NULL,
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<I>n</I>
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is ignored, and the conversion proceeds as
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above, except that the converted bytes are not written out to memory,
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and no length limit exists.
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<P>
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In order to avoid the case 2 above, the programmer should make sure
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<I>n</I>
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is greater than or equal to
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<I>wcstombs(NULL,src,0)+1</I>.
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<A NAME="lbAE"> </A>
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<H2>RETURN VALUE</H2>
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The
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<B>wcstombs</B>()
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function returns the number of bytes that make up the
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converted part of a multibyte sequence,
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not including the terminating null byte.
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If a wide character was encountered which could not be
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converted,
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<I>(size_t) -1</I>
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is returned.
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<A NAME="lbAF"> </A>
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<H2>ATTRIBUTES</H2>
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For an explanation of the terms used in this section, see
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<B><A HREF="/cgi-bin/man/man2html?7+attributes">attributes</A></B>(7).
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<TABLE BORDER>
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<TR VALIGN=top><TD><B>Interface</B></TD><TD><B>Attribute</B></TD><TD><B>Value</B><BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>wcstombs</B>()
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</TD><TD>Thread safety</TD><TD>MT-Safe<BR></TD></TR>
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</TABLE>
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<P>
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<A NAME="lbAG"> </A>
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<H2>CONFORMING TO</H2>
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POSIX.1-2001, POSIX.1-2008, C99.
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<A NAME="lbAH"> </A>
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<H2>NOTES</H2>
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The behavior of
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<B>wcstombs</B>()
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depends on the
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<B>LC_CTYPE</B>
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category of the
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current locale.
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<P>
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The function
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<B><A HREF="/cgi-bin/man/man2html?3+wcsrtombs">wcsrtombs</A></B>(3)
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provides a better interface to the same functionality.
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<A NAME="lbAI"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?3+mblen">mblen</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+mbstowcs">mbstowcs</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+mbtowc">mbtowc</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+wcsrtombs">wcsrtombs</A></B>(3)
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<B><A HREF="/cgi-bin/man/man2html?3+wctomb">wctomb</A></B>(3)
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<A NAME="lbAJ"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="4"><A HREF="#lbAB">NAME</A><DD>
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<DT id="5"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="6"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="7"><A HREF="#lbAE">RETURN VALUE</A><DD>
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<DT id="8"><A HREF="#lbAF">ATTRIBUTES</A><DD>
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<DT id="9"><A HREF="#lbAG">CONFORMING TO</A><DD>
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<DT id="10"><A HREF="#lbAH">NOTES</A><DD>
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<DT id="11"><A HREF="#lbAI">SEE ALSO</A><DD>
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<DT id="12"><A HREF="#lbAJ">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:59 GMT, March 31, 2021
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</BODY>
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</HTML>
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