std::mbrtoc32
Defined in header
<cuchar>
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std::size_t mbrtoc32( char32_t* pc32,
const char* s, |
(since C++11) | |
Converts a narrow multibyte character to its UTF-32 character representation.
If s
is not a null pointer, inspects at most n
bytes of the multibyte character string, beginning with the byte pointed to by s
to determine the number of bytes necessary to complete the next multibyte character (including any shift sequences). If the function determines that the next multibyte character in s
is complete and valid, converts it to the corresponding 32-bit character and stores it in *pc32 (if pc32
is not null).
If the multibyte character in *s
corresponds to a multi-char32_t sequence (not possible with UTF-32), then after the first call to this function, *ps
is updated in such a way that the next calls to mbrtoc32
will write out the additional char32_t, without considering *s
.
If s
is a null pointer, the values of n
and pc32
are ignored and the call is equivalent to std::mbrtoc32(NULL, "", 1, ps).
If the wide character produced is the null character, the conversion state *ps represents the initial shift state.
The multibyte encoding used by this function is specified by the currently active C locale.
[edit] Parameters
pc32 | - | pointer to the location where the resulting 32-bit character will be written |
s | - | pointer to the multibyte character string used as input |
n | - | limit on the number of bytes in s that can be examined |
ps | - | pointer to the conversion state object used when interpreting the multibyte string |
[edit] Return value
The first of the following that applies:
- 0 if the character converted from
s
(and stored in *pc32 if non-null) was the null character - the number of bytes [1...n] of the multibyte character successfully converted from
s
- -3 if the next char32_t from a multi-char32_t character has now been written to *pc32. No bytes are processed from the input in this case.
- -2 if the next
n
bytes constitute an incomplete, but so far valid, multibyte character. Nothing is written to *pc32. - -1 if encoding error occurs. Nothing is written to
*pc32
, the value EILSEQ is stored in errno and the value if *ps is unspecified.
[edit] See also
(C++11)
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convert a 32-bit wide character to narrow multibyte string (function) |
[virtual]
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converts a string from externT to internT, such as when reading from file (virtual protected member function of std::codecvt )
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C documentation for mbrtoc32
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