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MBSRTOWCS(3) Linux Programmer's Manual MBSRTOWCS(3)
mbsrtowcs - convert a multibyte string to a wide-character string
#include <wchar.h>
size_t mbsrtowcs(wchar_t *dest, const char **src,
size_t len, mbstate_t *ps);
If dest is not a NULL pointer, the mbsrtowcs() function converts the multibyte
string *src to a wide-character string starting at dest. At most len wide
characters are written to dest. The shift state *ps is updated. The
conversion is effectively performed by repeatedly calling mbrtowc(dest, *src,
n, ps) where n is some positive number, as long as this call succeeds, and
then incrementing dest by one and *src by the number of bytes consumed. The
conversion can stop for three reasons:
1. An invalid multibyte sequence has been encountered. In this case *src is
left pointing to the invalid multibyte sequence, (size_t) -1 is returned,
and errno is set to EILSEQ.
2. len non-L'\0' wide characters have been stored at dest. In this case *src
is left pointing to the next multibyte sequence to be converted, and the
number of wide characters written to dest is returned.
3. The multibyte string has been completely converted, including the
terminating '\0' (which has the side effect of bringing back *ps to the
initial state). In this case *src is set to NULL, and the number of wide
characters written to dest, excluding the terminating L'\0' character, is
returned.
If dest is NULL, len is ignored, and the conversion proceeds as above, except
that the converted wide characters are not written out to memory, and that no
length limit exists.
In both of the above cases, if ps is a NULL pointer, a static anonymous state
only known to the mbsrtowcs() function is used instead.
The programmer must ensure that there is room for at least len wide characters
at dest.
The mbsrtowcs() function returns the number of wide characters that make up
the converted part of the wide-character string, not including the terminating
null wide character. If an invalid multibyte sequence was encountered,
(size_t) -1 is returned, and errno set to EILSEQ.
C99.
The behavior of mbsrtowcs() depends on the LC_CTYPE category of the current
locale.
Passing NULL as ps is not multithread safe.
iconv(3), mbsnrtowcs(3), mbstowcs(3)
This page is part of release 3.32 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 1999-07-25 MBSRTOWCS(3)
HTML rendering created 2010-12-03 by Michael Kerrisk, author of The Linux Programming Interface