//en.cppreference.com/w/c/string/wide/wcsspn.html
#include <locale.h>
#include <wchar.h>
int main(void)
{
wchar_t dest[] = L"白猫 黑狗 甲虫";
const wchar_t src[] = L" 狗猫 白黑 ";
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);
}