| NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | CONFORMING TO | NOTES | SEE ALSO | COLOPHON | The Linux Programming Interface |
WCSTOMBS(3) Linux Programmer's Manual WCSTOMBS(3)
wcstombs - convert a wide-character string to a multibyte string
#include <stdlib.h>
size_t wcstombs(char *dest, const wchar_t *src, size_t n);
If dest is not a NULL pointer, 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 conversion starts in the
initial 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'\0'). In this case the
conversion ends in the initial state. The number of bytes written to
dest, excluding the terminating null byte ('\0'), 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
that no length limit exists.
In order to avoid the case 2 above, the programmer should make sure n
is greater or equal to wcstombs(NULL,src,0)+1.
The wcstombs() function returns the number of bytes that make up the
converted part of multibyte sequence, not including the terminating
null byte. If a wide character was encountered which could not be
converted, (size_t) -1 is returned.
C99.
The behavior of wcstombs() depends on the LC_CTYPE category of the
current locale.
The function wcsrtombs(3) provides a thread safe interface to the
same functionality.
mbstowcs(3), wcsrtombs(3)
This page is part of release 3.51 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
GNU 2011-10-16 WCSTOMBS(3)
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