Replacing multiple new lines in a file with just one

Question

This function is supposed to search through a text file for the new line character. When it finds the newline character, it increments the newLine counter, and when

Answer 1

What the sample code resolved is:

1) squeeze the consecutive a few '\n' to just one '\n'

2) Get rid the leading '\n' at the beginning if there is any.

  input:   '\n\n\naa\nbb\n\ncc' 
  output:   aa'\n'    
            bb'\n' //notice, there is no blank line here
            cc

If it was the aim, then your code logic is correct for it.

• By defining newLine = 1 , it will get rid of any leading '\n' of the input txt.

• And when there is a remained '\n' after processing, it will output a new line to give a hint.

Back to the question itself, if the actual aim is to squeeze consecutive blank lines to just one blank line(which needs two consecutive '\n', one for terminate previous line, one for blank line).

1) Let's confirm the input and expected output firstly,

Input text:

aaa'\n' //1st line, there is a '\n' append to 'aaa'  
'\n'    //2nd line, blank line
bbb'\n' //3rd line, there is a '\n' append to 'bbb'
'\n'    //4th line, blank line
'\n'    //5th line, blank line
'\n'    //6th line, blank line
ccc     //7th line,

Expected Output text:

aaa'\n' //1st line, there is a '\n' append to 'aaa'  
'\n'    //2nd line, blank line
bbb'\n' //3rd line, there is a '\n' append to 'bbb'
'\n'    //4th line, blank line
ccc     //5th line,

2) If it is the exact program target as above,then

if (c == '\n')
{
    newLine++;
    if (newLine < 3) // here should be 3 to print '\n' twice,
                     // one for 'aaa\n', one for blank line 
    {
        //printf("new line");
        putchar(c); 
    }
}

3) If you have to process the Windows format file(with \r\n ending) under Cygwin, then you could do as follows

while ((c = fgetc(fileContents)) != EOF)
{   
    if ( c == '\r') continue;// add this line to discard possible '\r'
    if (c == '\n')
    {
        newLine++;
        if (newLine < 3) //here should be 3 to print '\n' twice
        {
            printf("new line");
            putchar(c); 
        }
    }
    else 
    {
        putchar(c); 
        newLine = 0;
    }
}