C语言的一套环形buffer 使用函数接口

主要用于需要在内存开辟一段空间循环使用，考虑到buffer的循环行、安全性以及方便拓展性

本来自己项目有这方面需求 就自己写了一套封装函数

后来好像有修改 但是函数保证正确可用 我测试过-C language using a circular buffer function interface is mainly used to open up some space in memory required recycling, taking into account the buffer loop lines, security, and easy expandability had their own projects in this area needs to write a set of wrapper functions Later, there seems to be used to ensure the correct function to modify but I tested