#define _GNU_SOURCE
#include <stdio.h>
#include <stdint.h>
#include <dlfcn.h>

char *strcpy(char *s1, const char *s2)
{
	static char* (*real_strcpy)(char *, const char *) = NULL;
	if(!real_strcpy)
        real_strcpy = dlsym(RTLD_NEXT, "strcpy");
	char *p = real_strcpy(s1, s2);
    fprintf(stderr, "============== strcpy(%p, %p) = %p\n", s1, s2, p);
    return p;
}

char *strncpy(char *s1, const char *s2, size_t n)
{
	static char* (*real_strncpy)(char *, const char *, size_t) = NULL;
	if(!real_strncpy)
        real_strncpy = dlsym(RTLD_NEXT, "strncpy");
	char *p = real_strncpy(s1, s2, n);
    fprintf(stderr, "============== strncpy(%p, %p, %d) = %p\n", s1, s2, (int)n, p);
    return p;
}

void *memcpy(void *s1, const void *s2, size_t n)
{
	static void* (*real_memcpy)(void *, const void *, size_t) = NULL;
	if(!real_memcpy)
        real_memcpy = dlsym(RTLD_NEXT, "memcpy");
	void *p = real_memcpy(s1, s2, n);
    fprintf(stderr, "============== memcpy(%p, %p, %d) = %p\n", s1, s2, (int)n, p);
    return p;
}

#if 0
void* malloc(size_t size)
{
    static void* (*real_malloc)(size_t) = NULL;
    if (!real_malloc)
        real_malloc = dlsym(RTLD_NEXT, "malloc");

    void *p = real_malloc(size);
    fprintf(stderr, "============== malloc(%d) = %p\n", size, p);
    return p;
}
#endif