clearing input buffert.

This is a discussion on clearing input buffert. within the C Programming forums, part of the General Programming Boards category; I need to clear the input buffert (stdin) so that when I call fgets I only get the most resent ...

  1. #1
    Wannabe Coding God
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    clearing input buffert.

    I need to clear the input buffert (stdin) so that when I call fgets I only get the most resent input in it. So far I've figured that I should do it after I get the input from it but I don't know how to do it in the firsty place since I shouldn't use fflush (stdin). And don't want to use the one on the faq pages since it requiers somthing to be inputed if there ins't anything in it.
    Last edited by Shogun; 06-06-2003 at 12:49 PM.
    They say that if you play a Windows Install CD backwords, you hear satanic messages. That's nothing; play it forward and it installs Windows.

  2. #2
    Registered User
    Join Date
    May 2003
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    flush input

    Code:
    #include <stdio.h>
    
    void eatToNL(FILE * inputStream)
    {
        int c;
        /* Eat till (& including) the next newline */
        while ((c = getc(inputStream)) != EOF)
           if (c == '\n')
               break;
    }
    
    /* blah blah */
    eatToNL(stdin);
    /* blah blah */

  3. #3
    Been here, done that.
    Join Date
    May 2003
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    1,161
    That will only work if there is data in the buffer. If there isn't, you hang until someone hits a key.
    And don't want to use the one on the faq pages since it requiers somthing to be inputed if there ins't anything in it.
    What compiler are you using?
    Definition: Politics -- Latin, from
    poly meaning many and
    tics meaning blood sucking parasites
    -- Tom Smothers

  4. #4
    Wannabe Coding God
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    GCC 1 ;(
    They say that if you play a Windows Install CD backwords, you hear satanic messages. That's nothing; play it forward and it installs Windows.

  5. #5
    Wannabe Coding God
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    Mar 2003
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    okey.... and what do you mean by "broken by design"?

    thx a ton for the help.
    They say that if you play a Windows Install CD backwords, you hear satanic messages. That's nothing; play it forward and it installs Windows.

  6. #6
    Wannabe Coding God
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    I am using fgets but the thing is if the user prints like 100 Ps then my buffert wont catch all of it and then I should trow the left overs away since I know I won't need the left overs witch it doesn't take.
    Last edited by Shogun; 06-07-2003 at 01:37 PM.
    They say that if you play a Windows Install CD backwords, you hear satanic messages. That's nothing; play it forward and it installs Windows.

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