test_mem_array_functions.c

#include <string.h>
#include <stdio.h>

typedef char *p;

volatile p src = NULL;
volatile p dst = NULL;
volatile size_t n = 0;

#define TEST(x) if (x) ; else { printf("error, %s\n", #x); }

int main() {
    TEST(dst == memcpy(dst, src, n));
    TEST(dst == memmove(dst, src, n));
    TEST(dst == strncpy(dst, src, n));
    TEST(dst == memset(dst, 0, n));
    TEST(0 == strncmp(src, dst, n));
    TEST(0 == memcmp(src, dst, n));
    
    
    /* Observable effect after observable reads from 'volatile n'. 
    OS are not always give explicit message 
    about segmentation fault/invalid read at process termination. */
    printf("Still alive. Still alive.\n"); 
    return 0;
}