memchr.c

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#include <string.h>
 
void* memchr(const void* s, int c, size_t n)
{
    const unsigned char* p = (const unsigned char*)s;
 
    while (n--)
    {
        if (*p == (unsigned char)c)
        {
            return (void*)p;
        }
 
        ++p;
    }
 
    return NULL;
}