C语言：把src所指内存区域的前count个字节设置成字符c

把src所指内存区域的前count个字节设置成字符c

代码如下（示例）：

void *my_memset(void *src,unsigned char ch,unsigned short count)
{
    unsigned char *tmp = (unsigned char *)src;
    
    if(src == NULL) {
        return NULL;
    }
    
    while(count --) {
        *tmp ++ = ch;
    }
    
    return src;
}