Copy defined parts from text-file

This is a discussion on Copy defined parts from text-file within the C Programming forums, part of the General Programming Boards category; I need copy defined parts from input.txt file to new output.txt file. These parts started with text-string "start" and finished ...

  1. #1
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    Copy defined parts from text-file

    I need copy defined parts from input.txt file to new output.txt file.
    These parts started with text-string "start" and finished with text-string "stop".
    Eg. input.txt file:
    123
    789
    start
    ab 1
    bc 2
    ab 4
    yy 5
    ab 5
    stop
    001 some text...
    354
    start
    ab A
    ln #
    ab B
    stop
    qwerty
    m 021
    Output.txt file:
    145
    A#B
    I found only parts of solution:
    Variables: line = line-string, fr = input.txt, fw = output.txt, ab = "ab ", start = "start", stop = "stop" :
    Code:
    while (fgets(line, 80, fr) != NULL)  /*write each line of input.txt to variable "line" until EOF*/
    if (strstr(line, start) != NULL)  /*find start-string, but "if" is wrong!*/
    if (strncmp(line, ab, 3) == 0) putc(line[2],fw);  /*write 3rd charecters from line to output.txt*/
    Could you help me, please how can I read strings from input.txt only between strings start and stop?
    I think that it can be possible to use another while-loop but I am not yet successful.
    Thank you.

  2. #2
    and the hat of wrongness Salem's Avatar
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    Code:
    while (fgets(line, sizeof line, fr) != NULL) {
      if ( strstr( line, "start" ) != NULL ) doCopy = true;
      if ( strstr( line, "stop" ) != NULL ) doCopy = false;
      if ( doCopy ) {
      }
    }

  3. #3
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    It is very elegant solution .
    I do not know how to declare doCopy, true, false.
    Or which header file I must add. I am using now only <stdio.h> and <string.h> in this source.
    I am trying to find information elsewhere on board...

  4. #4
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    Could you tell me, please what I have study for to make this code from Salem with doCopy, true, false?
    Eg. on http://www.cprogramming.com/tutorial.html
    I do not know if doCopy is function or enum..
    Definition of true and false can be with
    Code:
    #define false 0
    #define true 1
    I cannot find some example.
    Please, write me some link where can I find information.
    Thanks for help.

  5. #5
    and the hat of wrongness Salem's Avatar
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    You can use #defines like you do, or an enum

    Code:
    int doCopy;
    or
    enum { false, true } doCopy;

  6. #6
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    It is GREAT, thank you very much Salem!

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