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mbrtoc16

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< c‎ | string‎ | multibyte
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Defined in header <uchar.h>
size_t mbrtoc16( char16_t* pc16, const char* s, size_t n, mbstate_t* ps );
(since C11)

Converts a narrow multibyte character to 16-bit character representation (typically, UTF-16).

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 16-bit character and stores it in *pc16 (if pc16 is not null).

If the multibyte character in *s corresponds to a multi-char16_t sequence (e.g. a surrogate pair in UTF-16), then after the first call to this function, *ps is updated in such a way that the next call to mbrtoc16 will write out the additional char16_t, without considering *s.

If s is a null pointer, the values of n and pc16 are ignored and the call is equivalent to mbrtoc16(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_16__ is defined, the 16-bit encoding used by this function is UTF-16, otherwise it is implementation-defined.

[edit] Parameters

pc16 - pointer to the location where the resulting 16-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 *pc16 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 char16_t from a multi-char16_t character (e.g. a surrogate pair) has now been written to *pc16. 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 *pc16.
  • -1 if encoding error occurs. Nothing is written to *pc16, the value EILSEQ is stored in errno and the value if *ps is unspecified.

[edit] See also

convert a 16-bit wide character to narrow multibyte string
(function) [edit]
C++ documentation for mbrtoc16