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LEARN ABOUT X11R4

wcstombs

WCSTOMBS(3)						     Linux Programmer's Manual						       WCSTOMBS(3)

NAME

       wcstombs - convert a wide-character string to a multibyte string

SYNOPSIS

       #include <stdlib.h>

       size_t wcstombs(char *dest, const wchar_t *src, size_t n);

DESCRIPTION

       If  dest  is  not  NULL,  the wcstombs() function converts the wide-character string src to a multibyte string starting at dest.  At most n
       bytes are written to dest.  The sequence of characters placed in dest begins in the initial shift state.  The conversion can stop for three
       reasons:

       1. A  wide  character  has been encountered that can not be represented as a multibyte sequence (according to the current locale).  In this
	  case, (size_t) -1 is returned.

       2. The length limit forces a stop.  In this case, the number of bytes written to dest is returned, but the shift state  at  this  point	is
	  lost.

       3. The  wide-character string has been completely converted, including the terminating null wide character (L'').  In this case, the con-
	  version ends in the initial shift state.  The number of bytes written to dest, excluding the terminating null byte (''), is returned.

       The programmer must ensure that there is room for at least n bytes at dest.

       If dest is NULL, n is ignored, and the conversion proceeds as above, except that the converted bytes are not written out to memory, and	no
       length limit exists.

       In order to avoid the case 2 above, the programmer should make sure n is greater than or equal to wcstombs(NULL,src,0)+1.

RETURN VALUE

       The  wcstombs() function returns the number of bytes that make up the converted part of a multibyte sequence, not including the terminating
       null byte.  If a wide character was encountered which could not be converted, (size_t) -1 is returned.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       +-----------+---------------+---------+
       |Interface  | Attribute	   | Value   |
       +-----------+---------------+---------+
       |wcstombs() | Thread safety | MT-Safe |
       +-----------+---------------+---------+

CONFORMING TO

       POSIX.1-2001, POSIX.1-2008, C99.

NOTES

       The behavior of wcstombs() depends on the LC_CTYPE category of the current locale.

       The function wcsrtombs(3) provides a better interface to the same functionality.

SEE ALSO

       mblen(3), mbstowcs(3), mbtowc(3), wcsrtombs(3) wctomb(3)

COLOPHON

       This page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and  the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

GNU
								    2017-09-15							       WCSTOMBS(3)

SCO