setbuf(FILE *stream, char *buf);

void setbuf(FILE *stream, char *buf);

如果buf为NULL,则关闭流stream的的缓冲区;

否则setbuf函数等价于:

(void)setvbuf(stream, buf, _IOFBF, BUFSIZ)。

注意自定义缓冲区的尺寸必须为BUFSIZ个字节。

// int setvbuf(FILE *stream, char *buf, int mode, size_t size);

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原文地址:https://www.cnblogs.com/ztguang/p/12647401.html