memcmp.c

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#include <string.h>
 
int memcmp(const void* s1, const void* s2, size_t n)
{
    const unsigned char* p1 = (const unsigned char*)s1;
    const unsigned char* p2 = (const unsigned char*)s2;
 
    while (n--)
    {
        if (*p1 != *p2)
        {
            return *p1 - *p2;
        }
 
        ++p1;
        ++p2;
    }
 
    return 0;
}