Standard C++ Library Reference ISO/IEC (VERSION3)

wcsrtombs
size_t wcsrtombs(char *dst, const wchar_t **src,
size_t len, mbstate_t *ps);
The function converts the wide-character string beginning at *src to a sequence of multibyte characters as
if by repeated calls of the form:
x = wcrtomb(dst ? dst : buf, *src, ps != 0 ? ps : &internal)
where buf is an array of type char and internal is an object of type mbstate_t, both internal to the
wcsrtombs function. At program startup, internal is initialized to the initial conversion state. No
other library function alters the value stored in internal.
If dst is not a null pointer, the wcsrtombs function stores at most len bytes by calls to wcrtomb. The
function effectively increments dst by x and *src by one after each call to wcrtomb that stores a
complete converted multibyte character in the remaining space available. After a call that stores a complete
null multibyte character at dst (including any shift sequence needed to restore the initial shift state), the
function stores a null pointer at *src.
If dst is a null pointer, len is effectively assigned a large value.
The function returns:
(size_t)-1, if a call to wcrtomb returns (size_t)-1, indicating that it has detected an
invalid wide-character code
●
the number of bytes successfully converted, not including the terminating null byte●
wcsspn
size_t wcsspn(const wchar_t *s1, const wchar_t *s2);
The function searches for the first element s1[i] in the wide string s1 that equals none of the elements of
the wide string s2 and returns i. It considers the terminating null wide character as part of the wide string
s1 only.
wcsstr
wchar_t *wcsstr(const wchar_t *s1, const wchar_t *s2); [not in C++]
const wchar_t *wcsstr(const wchar_t *s1, const wchar_t *s2); [C++ only]
wchar_t *wcsstr(wchar_t *s1, const wchar_t *s2); [C++ only]
The function searches for the first sequence of elements in the wide string s1 that matches the sequence of
elements in the wide string s2, not including its terminating null wide character. If successful, the function
returns the address of the matching first element; otherwise, it returns a null pointer.
wcstod
double wcstod(const wchar_t *nptr,
wchar_t **endptr);