Declaration

size_t strspn(const char* kcpString, const char* kcpChars);

Description

This function returns the index to the first occurrence of a character that is not in the in the null-terminated set "kcpChars" that is inside the null-terminated string "kcpString."

Example

#include <cstdio>
#include <cstring>

int main()
{
    char caString[] = "XoaX.net";
    char caChars[] = ".aXo";
    // Find the first not of ".aXo" inside of "XoaX.net"
    int iPos = strspn(caString, caChars);
    printf("First not of %s found at %i\n", caChars, iPos);
    printf("First not in %s is %c\n", caChars, caString[iPos]);

    return 0;
}

Output