Counting lines of code without the comments and blank lines

[Leibnitz]

********************************************************************************************
If you've ever wanted to count the lines of your code without the comments and blank lines ,here is a piece of code that
i have wrote that will help you do it.

#include <stdio.h>
#include <string.h>
#include <direct.h>
#include <windows.h>

// checks if a certain file or directory exist
bool fExist( char* filepath )
{
    WIN32_FIND_DATA file;
    HANDLE hFile;
    if (( hFile = FindFirstFile( filepath,&file ))  
         == INVALID_HANDLE_VALUE )
    {
          return false;
    }
    return true;
}

// determin if a line is a blank line
bool isblankline( char *buff )
{
	for( int i = 0; buff[i] != 0; i++ )
	{
		if( buff[i] - ' ' > 0 )
			return false;
	}

	return true;
}

// determin if a line is a commentary
bool iscommentary( char *buff )
{
	for( int i = 0; buff[i] != 0; i++ )
	{
		if(( buff[i] - '/' == 0 ) && ( buff[i+1] - '/' == 0 ) || 
			( buff[i+1] - '*' == 0 ))
		{
			buff[i] = 0;
		}
	}

	if( isblankline( buff ))
		return true;

	return false;
}


void main()
{
	FILE *file;
	char *filename;
	char *buff;
	int lines = 0;
	
	// allocating memory for 'filename' and 'buff'
	filename = ( char* )malloc( sizeof(char) * 200 );
	buff = ( char* )malloc( sizeof(char) * 200 );

	if(!filename)
	{
		fprintf( stderr, &quot;can't allocate memory for \&quot;filename\&quot; .\n&quot;);
		exit(1);
	}

	if(!buff)
	{
		fprintf( stderr, &quot;can't allocate memory for \&quot;buff\&quot; .\n&quot;);
		exit(1);
	}
	
	strcpy( filename, &quot;place your file name here&quot; ); // filename

	// this part is not strictly necessary but i have included anyway
	// it checks if the file exist
	if( !fExist( filename ))
	{
		fprintf( stderr, &quot;incorrect filename.\n&quot;);
		exit(1);
	}

	file = fopen( filename, &quot;r&quot; );

	if(!file)
	{
		fprintf( stderr, &quot;error while opening %s.\n&quot;, filename );
		exit(1);
	}

	while( fgets( buff, 100, file ) != NULL )
	{
		if( !isblankline( buff ) && !iscommentary( buff ))
		{
			lines++;
			//printf(&quot;%s&quot;,buff); // display the code without the blank lines and commentaries
		}
	}

	printf(&quot;There are %d lines in the file \&quot;%s\&quot;.\n&quot;, lines, filename );

	free( filename );
	free( buff );
}

 

[xwb]

Thanks for sharing it with us. Some minor improvement that you might like to add:

1) the program does not account for multiple line comments.
2) tab is also a whitespace character. A line containing tabs and blank spaces would be counted.

 

[Leibnitz]

Thanks for replying !

1)a closer look to the function "isblankline" would show that a line containing tabs and blank spaces would not be counted.Since the ascii value of tabs characters is lesser than the value of the whitespaces characters.
And this is also true for the new line characters "\n" and the carriage return characters "\r".

2)However your first remark is perfectly right,so i'll try to work it out.

 

[xwb]

You're right - I missed that one.