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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