secure string copy test

string_copy.c

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

#define HELLOWORLD "helloworld"
#define HELLOWORLD1 "helloworld1"
int main()
{
    char name[sizeof(HELLOWORLD)] = HELLOWORLD;
    char name1[sizeof(HELLOWORLD1)] = HELLOWORLD1;
    char dest[sizeof(HELLOWORLD)] = { 0 };
    int ret;

    printf(" len %zu\n", strlen(name));
    printf("size %zu\n", sizeof(name));
    printf(" len %zu\n", strlen(name1));
    printf("size %zu\n", sizeof(name1));

    memset(dest, (char)0xff, sizeof(dest));
#if 1
    ret = strncpy_s(dest, sizeof(dest), name1, sizeof(dest) - 1);
    printf("ret %d\n", ret);
#else
    strncpy(dest, name1, sizeof(dest) - 1);
#endif

    printf(" len %zu\n", strlen(dest));
    printf("size %zu\n", sizeof(dest));
    printf("dest %s\n", dest);
    return 0;
}