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linux_man_pages_library

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.i dest
by one and
.i *src
by the number of bytes consumed.
the conversion can stop for three reasons:
.ip 1. 3
an invalid multibyte sequence has been encountered.
in this case,
.i *src
is left pointing to the invalid multibyte sequence,
.i (size_t)\ \-1
is returned,
and
.i errno
is set to
.br eilseq .
.ip 2.
.i len
non-l\(aq\e0\(aq wide characters have been stored at
.ir dest .
in this case,
.i *src
is left pointing to the next
multibyte sequence to be converted,
and the number of wide characters written to
.i dest
is returned.
.ip 3.
the multibyte string has been completely converted, including the
terminating null wide character (\(aq\e0\(aq), which has the side
effect of bringing back
.i *ps
to the
initial state.
in this case,
.i *src
is set to null, and the number of wide
characters written to
.ir dest ,
excluding the terminating null wide character, is returned.
.pp
if
.ir dest
is null,
.i 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.
.pp
in both of the above cases,
if
.i ps
is null, a static anonymous
state known only to the
.br mbsrtowcs ()
function is used instead.
.pp
the programmer must ensure that there is room for at least
.i len
wide
characters at
.ir dest .
.sh return value
the
.br 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,
.i (size_t)\ \-1
is returned, and
.i errno
set to
.br eilseq .
.sh attributes
for an explanation of the terms used in this section, see
.br attributes (7).
.ad l
.nh
.ts
allbox;
lb lb lbx
l l l.
interface attribute value
t{
.br mbsrtowcs ()
t} thread safety t{
mt-unsafe race:mbsrtowcs/!ps
t}
.te
.hy
.ad
.sp 1
.sh conforming to
posix.1-2001, posix.1-2008, c99.
.sh notes
the behavior of
.br mbsrtowcs ()