模拟实现strncpy

#include<stdio.h>
#include<windows.h>
#include<assert.h>
char* my_strncpy(char *dest, const char *src, int count)
{
	char *cp = dest;
	assert(src && dest);
	while (count && (*dest++ = *src++))
	{
		count--;
	}
	if (count>0)
	{
		while (--count)
		{
			*dest++ = '\0';
		}
	}
	return cp;
}

int main()
{
	char *p = "abcd";
    char q[5];
    printf("%s\n", my_strncpy(q, p, 5));
	system("pause");
	return 0;
}