fgets misses first character in file :?

This is a discussion on fgets misses first character in file :? within the C Programming forums, part of the General Programming Boards category; Hi guys, I'm having problems with reading the first line in a certain text file. I use the following function ...

  1. #1
    1ST » R. vd Kooij
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    fgets misses first character in file :?

    Hi guys,

    I'm having problems with reading the first line in a certain text file. I use the following function to do this:
    Code:
       fpin = fopen(id_index, "rb");
       while((ih=fgetc(fpin))!=EOF)
       {
          while(fgets(buf,BUFSIZ,fpin)!=NULL)
          {
             strcpy(id_array[cnt],buf);
             cnt++; // count the amount of identifier files found
          }
       }
       fclose(fpin);
    This is what the text file (id_index) looks like:
    840.txt
    1224.txt
    1293.txt
    520.txt
    909.txt
    1101.txt
    1042.txt
    1160.txt
    1294.txt
    1928.txt
    1938.txt
    1933.txt
    2018.txt
    1900.txt
    1899.txt
    Now when I save those names, line by line into an array, the first value of the array is:
    id_array[0]: 40.txt
    So it misses the first character! Any idea how I can solve this problem?

    Thanks in advance for any help!


    René
    Last edited by rkooij; 04-26-2006 at 07:41 AM.
    http://www.f1rstracing.nl/
    OS: Windows XP
    Compiler: Dev-C++

  2. #2
    and the hat of wrongness Salem's Avatar
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    Well you read the first char with fgetc
    then the rest of the line with fgets

    > while((ih=fgetc(fpin))!=EOF)
    This is on the whole pretty pointless
    The first time, it burns a char
    The second time, it returns EOF, because the inner loop has read all the way to end of file.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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  3. #3
    1ST » R. vd Kooij
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    Quote Originally Posted by Salem
    Well you read the first char with fgetc
    then the rest of the line with fgets

    > while((ih=fgetc(fpin))!=EOF)
    This is on the whole pretty pointless
    The first time, it burns a char
    The second time, it returns EOF, because the inner loop has read all the way to end of file.
    Ha, you're 100% right! I have copied and misinterpreted that part of the function from another function. I did always question the exact meaning of this line but never bothered to dive into it . Now that you've explained it's as obvious as possible!
    Thanks very much!
    http://www.f1rstracing.nl/
    OS: Windows XP
    Compiler: Dev-C++

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