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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../../cpp/../c/string/wide/wcsspn.html below:

wcsspn - cppreference.com

size_t wcsspn( const wchar_t* dest, const wchar_t* src ); (since C95)

Returns the length of the maximum initial segment of the wide string pointed to by dest, that consists of only the characters found in wide string pointed to by src.

[edit] Parameters dest - pointer to the null-terminated wide string to be analyzed src - pointer to the null-terminated wide string that contains the characters to search for [edit] Return value

The length of the maximum initial segment that contains only characters from wide string pointed to by src

[edit] Example

#include <locale.h>
#include <wchar.h>
 
int main(void)
{
    wchar_t dest[] = L"ç½ç« é»ç ç²è«";
    const wchar_t src[] = L" çç« ç½é» ";
    const size_t len = wcsspn(dest, src);
    dest[len] = L'\0'; /* terminates the segment to print it out */
 
    setlocale(LC_ALL, "en_US.utf8");
    wprintf(L"The length of maximum initial segment is %td.\n"
            L"The segment is \"%ls\".\n", len, dest);
}

Output:

The length of maximum initial segment is 6.
The segment is "ç½ç« é»ç ".

[edit] References

C11 standard (ISO/IEC 9899:2011):

7.29.4.5.5 The wcsspn function (p: 436)

C99 standard (ISO/IEC 9899:1999):

7.24.4.5.5 The wcsspn function (p: 382)

[edit] See also returns the length of the maximum initial segment that consists
of only the wide chars not found in another wide string
(function) [edit] finds the first location of any wide character in one wide string, in another wide string
(function) [edit]

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