Defined in header <cuchar>
Converts a narrow multibyte character to its 32-bit character representation (typically, UTF-32).
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 is a null pointer, the values of
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.
If the macro __STDC_UTF_32__ is defined, the 32-bit encoding used by this function is UTF-32, otherwise it is implementation-defined.
|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|
 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
- -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
nbytes 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.
 See also
| convert a 32-bit wide character to narrow multibyte string |
| converts a string from externT to internT, such as when reading from file |
(virtual protected member function of
C documentation for mbrtoc32