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判断标准I/O的缓冲区类型

2024-07-02 09:38:47   229人阅读

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#include <stdio.h>
void pr_stdio(const char *, FILE *);
int main()
{
    FILE *fp;
    fputs("enter any character\n",stdout);
    if(getchar()==EOF)
        printf("getchar error");
    fputs("one line to standard error\n",stderr);
    pr_stdio("stdin",stdin);
    pr_stdio("stdout",stdout);
    pr_stdio("stderr",stderr);
     
    if((fp=fopen("/etc/motd","r"))==NULL)
        printf("fopen error");
    if(fgetc(fp)==EOF)
        printf("getc error");
    pr_stdio("/etc/motd",fp);
    return 0;
}
void pr_stdio(const char *name, FILE *fp)
{
    printf("stream=%s, ",name);
    if(fp->_flags & _IO_UNBUFFERED)
        printf("unbuffered");
    else if(fp->_flags & _IO_LINE_BUF)
        printf("line buffered");
    else
        printf("fully buffered or modified");
    printf(",buffer size = %d\n",fp->_IO_buf_end-fp->_IO_buf_base);
}

　　在Ubuntu下运行如下：


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