strcspn.c

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#include <string.h>
 
size_t strcspn(const char* s1, const char* s2)
{
    size_t len = 0;
    const char* p;
 
    while (s1[len])
    {
        p = s2;
 
        while (*p)
        {
            if (s1[len] == *p++)
            {
                return len;
            }
        }
 
        ++len;
    }
 
    return len;
}