#define BUFF        1024*1024*512
#define REP         8
#define ADR_A       1024*1024*510
#define ADR_B       1024*1024*128
#define SRH_A       7
#define SRH_B       77
#include <stdlib.h>
#include <stdio.h>

inline void* u_memchr(const void *s, int c, size_t n)
{
    register const unsigned char *r;

    for(r = (const unsigned char *) s;n;++r, --n) {
        if (*r == ((unsigned char)c))
            return (void *) r;
    }

    return NULL;
}

int
main(int argc, char** argv)
{
    char*       bytes;
    unsigned    i;

    bytes = calloc(BUFF, 1);
    bytes[ADR_A] = SRH_A;
    bytes[ADR_B] = SRH_B;

    for(i = 0;i != REP;i++)
        printf("%p\n", u_memchr(bytes, SRH_A, BUFF));

    for(i = 0;i != REP;i++)
        printf("%p\n", u_memchr(bytes, SRH_B, BUFF));

    return(EXIT_SUCCESS);
}