Originální popis anglicky:
mbsrtowcs - convert a multibyte string to a wide character string
Návod, kniha: Linux Programmer's Manual
#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.
ISO/ANSI C, UNIX98
iconv(3),
mbsnrtowcs(3),
mbstowcs(3)
The behaviour of
mbsrtowcs depends on the LC_CTYPE category of the
current locale.
Passing NULL as
ps is not multi-thread safe.
