< c‎ | string‎ | multibyte
Revision as of 17:10, 2 November 2012 by P12bot (Talk | contribs)

Defined in header <wchar.h>
size_t mbrtowc( wchar_t* pwc, const char* s, size_t n, mbstate_t* ps );

Converts a narrow multibyte character to a wide character.

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 wide character and stores it in *pwc (if pwc is not null).

If s is a null pointer, the values of n and pwc are ignored and call is equivalent to mbrtowc(NULL, "", 1, ps).

If the wide character produced is the null character, the conversion state stored in *ps is the initial shift state.



pwc - pointer to the location where the resulting wide 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 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 pwc if non-null) was the null character
  • the number of bytes [1...n] of the multibyte character successfully converted from s
  • (size_t)-2 if the next n bytes constitute an incomplete, but so far valid, multibyte character. Nothing is written to *pwc.
  • (size_t)-1 if encoding error occurs. Nothing is written to *pwc, the value EILSEQ is stored in errno and the value of *ps is left unspecified.


See also

Template:c/string/multibyte/dcl list mbtowcTemplate:c/string/multibyte/dcl list wcrtomb
C++ documentation for mbrtowc