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MBSTOWCS(3) NetBSD Library Functions Manual MBSTOWCS(3)
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mbstowcs -- converts a multibyte character string to a wide-character
Standard C Library (libc, -lc)
mbstowcs(wchar_t * restrict pwcs, const char * restrict s, size_t n);
mbstowcs() converts a nul-terminated multibyte character string pointed
to by s to the corresponding wide-character string and stores it in the
array pointed to by pwcs. This function may modify the first at most n
elements of the array pointed to by pwcs. Each character will be con-
verted as if mbtowc(3) is continuously called, except the internal state
of mbtowc(3) will not be affected.
For state-dependent encoding, mbstowcs() implies the multibyte character
string pointed to by s always begins with an initial state.
These are the special cases:
pwcs == NULL mbstowcs() returns the number of elements to store the
whole wide-character string corresponding to the multibyte
character string pointed to by s. In this case, n is
s == NULL Undefined (may cause the program to crash).
0 or positive
Number of elements stored in the array pointed to by pwcs.
There are no cases that the value returned is greater than
n (unless pwcs is a null pointer) or the value of the
MB_CUR_MAX macro. If the return value is equal to n, the
string pointed to by pwcs will not be nul-terminated.
(size_t)-1 s points to a string containing an invalid or incomplete
multibyte character. The mbstowcs() also sets errno to
indicate the error.
mbstowcs() may cause an error in the following case:
[EILSEQ] s points to a string containing an invalid or incom-
plete multibyte character.
mbtowc(3), setlocale(3), wcstombs(3)
The mbstowcs() function conforms to ANSI X3.159-1989 (``ANSI C89''). The
restrict qualifier is added at ISO/IEC 9899:1999 (``ISO C99'').
NetBSD 7.1.2 March 16, 2011 NetBSD 7.1.2