How to ignore a particular string operation in C

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Hi,

I have a text file where I am commenting the lines from the first occurence of the string "OPEN" in line till a dot (.) is occured.
ie OPEN abc def
ghi jkl
mno pqr.

is replaced as below in another file

//OPEN abc def
// ghi jkl
// mno pqr.

But the challenge I am facing is, that I have to "ignore" commenting the lines if the string OPEN is between EXEC and END-EXEC.

ie EXEC SQL
OPEN CUR1
END-EXEC.

My program comments the above 2 lines also( One which starts with OPEN and END-EXEC.)

Is there a way to get the previous line of a file after a string is encountered..?

Thanks in advance,

Faez

Posted 26-Mar-12 21:18pm

Faez Shingeri

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Resmi Anna 27-Mar-12 6:09am

Why dont you post the code you have done so far?so that someone can just add 2 or 3 lines of code to that to resolve your issue.

Faez Shingeri 27-Mar-12 6:18am

<pre>
if (strncmp(buffer2,"OPEN", 4) == 0)
{
found=1;
sprintf(buffer1," // %s",buffer);
fputs(buffer1,fp2);
n=1;
}
else if (strncmp(buffer2,"EXEC",4)== 0)
{
found =1;

sprintf(buffer1," %s",buffer);
fputs(buffer1,fp2);

o=1;

}
</pre>
and then if found =1 , am running a loop till a dot is encountered.

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CPallini · Accepted Answer · 2012-03-26T21:35:00

You may build a state machine:
Its normal state could be, for instance, RUNNING.
While in RUNNING state, if it matches 'OPEN' then it goes into COMMENT state and start commenting until it matches '.' (going into RUNNING state again). On the other hand, if, while in RUNNING state it matches 'EXEC' then it goes into NOCOMMENT (or whatever) state, thus disabling comments until 'END-EXEC' is found and state becomes back RUNNING.

[update]
(warning: not tested, that is up to you)

C++

enum 
{
  eRUNNING,
  eCOMMENT,
  eNOCOMMENT
};
//...
if ( state == eRUNNING)
{
  if (strncmp(buffer2,"OPEN", 4) == 0)
  {
    fprintf(fp2, "      // %s", buffer);
    state = eCOMMENT;
  }
  else
  {
    fprintf(fp2, "     %s", buffer);
    if (strncmp(buffer2,"EXEC",4)== 0)
    {
      state = eNOCOMMENT;
    }
  }
}
else if (state == eCOMMENT)
{
  fprintf(fp2, "      // %s", buffer);
  if (strncmp(buffer2,".", 1) == 0)
  {
    state = eRUNNING;
  }
}
else
{ // state here is eNOCOMMENT
  fprintf(fp2, "     %s", buffer);
  if (strncmp(buffer2,"END-EXEC",8)== 0)
  {
    state = eRUNNING
  }
}
//...

[/update]