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Old Apr 26th, 2006, 10:55 AM   #1
nnxion
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Comments stripper (stripc in C)
Well I had a file which had a load of comments, and I wanted to get rid of them fast. So I made this program. Please comment for any enhancements or anything else.

LGPL basically means you can use it in both proprietary and open source projects, but just give me credit. (I think, if not then change the licence to that.)
The file I tested it on is shown below:
(Toggle Plain Text) 
  	/* very stupid
  	example */
#include <stdio.h>

int main()
{
	int i;
	printf("hi\n");

	/* huh? */ printf("%d\n", '/*');

	if(1 != 1/2)
		printf("stup/*id\n");

	/*** bye ***/
	for(i = 0; /* lol */ i < 1; i++)
		printf("bye\n");

	// exit
	return 0;
}
(Toggle Plain Text) 
/*
stripc - strips your comments.
Copyright (C) 2006 Ruben aka nnxion aka rubenisme (rubenisme.com)

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/
#include <stdio.h>
#include <stdlib.h>

#define bool int
#define false 0
#define true 1

/* trouble in river city (TM DaWei) */
int uhOh(char * message)
{
	fprintf(stderr, "%s\n", message);
	return 1;
}

/* main */
int main(int argc, char ** argv)
{
	int i;
	bool comment = false, block = false, qliteral = false;
	FILE * fp;
	long fsize;
	char * buffer;
	char * file;

	/* check arguments and get filename */
	if(argc != 2)
		return uhOh("Usage: stripc <filename>");
	file = argv[1];

	/* open file */
	fp = fopen(file, "rb");
	if(fp == NULL)
		return uhOh("Could not open file.");

	/* obtain file size */
	fseek(fp, 0, SEEK_END);
	fsize = ftell(fp);
	rewind(fp);

	/* allocate memory */
	buffer = malloc(fsize);
	if(buffer == NULL)
		return uhOh("Could not allocate memory.");

	/* copy file into buffer */
	fread(buffer, 1, fsize, fp);
	fclose(fp);
	fp = fopen(file, "wb");
	if(fp == NULL)
		return uhOh("Could not open file.");

	/* loop through buffer */
	for(i = 0; i < fsize; i++)
	{
		if(!comment && !qliteral && (buffer[i] == '/' && (buffer[i+1] == '/' || buffer[i+1] == '*')))
		{
			comment = true;
			if(buffer[i+1] == '*')
				block = true;
			i++;
		}

		if(!comment && (buffer[i] == '"' || buffer[i] == '\'' && buffer[i-1] != '\\'))
		{
			static bool squote = false, dblquote = false;
			if(buffer[i] == '"' && !squote)
			{
				dblquote =! dblquote;
				qliteral =! qliteral;
			}
			else if(buffer[i] == '\'' && !dblquote)
			{
				squote =! squote;
				qliteral =! qliteral;
			}
		}

		if(!comment || qliteral)
                fprintf(fp, "%c", buffer[i]);

		else
		{
			if(block)
			{
				if(buffer[i] == '*' && buffer[i+1] == '/')
				{
					comment = false;
					block = false;
					i++;
				}
			}
			else
			{
				if(buffer[i] == '\n')
				{
					comment = false;
					i++;
				}
			}

		}
	}

	/* close & free */
	fclose (fp);
	free (buffer);
	return 0;
}
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Old Apr 26th, 2006, 11:39 AM   #2
OpenLoop
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I like the idea. Now, can you make a program that GENERATEs comments for me. Because really that's my problem right there
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Old Apr 26th, 2006, 1:37 PM   #3
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You took the words right out of my mouth.

Nice work.
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Old Apr 26th, 2006, 3:32 PM   #4
nnxion
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Quote:
Originally Posted by OpenLoop
I like the idea. Now, can you make a program that GENERATEs comments for me. Because really that's my problem right there
Hehe well, I'm pretty sure there are some programs that generate comments for your functions. I haven't searched on google but I'm pretty sure there are a couple.

Anyway, I fixed a small bug, which happened when '\\' was in the code, because it wouldn't see '\\' but would see '\'', so that it would think the literal did not end.
(Toggle Plain Text) 
/*
stripc - strips your comments.
Copyright (C) 2006 Ruben aka nnxion aka rubenisme (rubenisme.com)

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/
#include <stdio.h>
#include <stdlib.h>

#define bool int
#define false 0
#define true 1

/* trouble in River City (TM DaWei) */
int uhOh(char * message)
{
	fprintf(stderr, "%s\n", message);
	return 1;
}

/* main */
int main(int argc, char ** argv)
{
	int i;
	bool comment = false, block = false, qliteral = false;
	FILE * fp;
	long fsize;
	char * buffer;
	char * file;

	/* check arguments and get filename */
	if(argc != 2)
		return uhOh("Usage: stripc <filename>");
	file = argv[1];

	/* open file */
	fp = fopen(file, "rb");
	if(fp == NULL)
		return uhOh("Could not open file.");

	/* obtain file size */
	fseek(fp, 0, SEEK_END);
	fsize = ftell(fp);
	rewind(fp);

	/* allocate memory */
	buffer = malloc(fsize);
	if(buffer == NULL)
		return uhOh("Could not allocate memory.");

	/* copy file into buffer */
	fread(buffer, 1, fsize, fp);
	fclose(fp);
	fp = fopen(file, "wb");
	if(fp == NULL)
		return uhOh("Could not open file.");

	/* loop through buffer */
	for(i = 0; i < fsize; i++)
	{
		if(!comment && !qliteral && (buffer[i] == '/' && (buffer[i+1] == '/' || buffer[i+1] == '*')))
		{
			comment = true;
			if(buffer[i+1] == '*')
				block = true;
			i++;
		}

		if(!comment && (buffer[i] == '"' || buffer[i] == '\''))
		{
			static bool squote = false, dblquote = false;
			if(buffer[i-1] != '\\' || buffer[i-2] != '\\')
				;
			else if(buffer[i] == '"' && !squote)
			{
				dblquote =! dblquote;
				qliteral =! qliteral;
			}
			else if(buffer[i] == '\'' && !dblquote)
			{
				squote =! squote;
				qliteral =! qliteral;
			}
		}

		if(!comment || qliteral)
                fprintf(fp, "%c", buffer[i]);

		else
		{
			if(block)
			{
				if(buffer[i] == '*' && buffer[i+1] == '/')
				{
					comment = false;
					block = false;
					i++;
				}
			}
			else
			{
				if(buffer[i] == '\n')
				{
					comment = false;
					i++;
				}
			}

		}
	}

	/* close & free */
	fclose(fp);
	free(buffer);
	return 0;
}
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Old Apr 27th, 2006, 4:46 AM   #5
nnxion
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Two other minor bugs fixed.
When a line comment was present it skipped the first character and didn't print the newline.
(Toggle Plain Text) 
/*
stripc - strips your comments.
Copyright (C) 2006 Ruben aka nnxion aka rubenisme (rubenisme.com)

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/
#include <stdio.h>
#include <stdlib.h>

#define bool int
#define false 0
#define true 1

/* trouble in River City (TM DaWei) */
int uhOh(char * message)
{
	fprintf(stderr, "%s\n", message);
	return 1;
}

/* main */
int main(int argc, char ** argv)
{
	int i;
	bool comment = false, block = false, qliteral = false;
	FILE * fp;
	long fsize;
	char * buffer;
	char * file = "C:\\Documents and Settings\\adriaanseru\\My Documents\\My Code\\opengl\\opengl.cpp";

	/* check arguments and get filename */
	//if(argc != 2)
	//	return uhOh("Usage: stripc <filename>");
	//file = argv[1];

	/* open file */
	fp = fopen(file, "rb");
	if(fp == NULL)
		return uhOh("Could not open file.");

	/* obtain file size */
	fseek(fp, 0, SEEK_END);
	fsize = ftell(fp);
	rewind(fp);

	/* allocate memory */
	buffer = malloc(fsize);
	if(buffer == NULL)
		return uhOh("Could not allocate memory.");

	/* copy file into buffer */
	fread(buffer, 1, fsize, fp);
	fclose(fp);
	fp = fopen(file, "wb");
	if(fp == NULL)
		return uhOh("Could not open file.");

	/* loop through buffer */
	for(i = 0; i < fsize; i++)
	{
		if(!comment && !qliteral && (buffer[i] == '/' && (buffer[i+1] == '/' || buffer[i+1] == '*')))
		{
			comment = true;
			if(buffer[i+1] == '*')
				block = true;
			i++;
		}

		if(!comment && (buffer[i] == '"' || buffer[i] == '\''))
		{
			static bool squote = false, dblquote = false;
			if(buffer[i-1] != '\\' || buffer[i-2] != '\\')
				;
			else if(buffer[i] == '"' && !squote)
			{
				dblquote =! dblquote;
				qliteral =! qliteral;
			}
			else if(buffer[i] == '\'' && !dblquote)
			{
				squote =! squote;
				qliteral =! qliteral;
			}
		}

		if(comment && !qliteral)
		{
			if(block)
			{
				if(buffer[i] == '*' && buffer[i+1] == '/')
				{
					comment = false;
					block = false;
					i++;
				}
			}
			else
			{
				if(buffer[i] == '\n')
				{
					comment = false;
					fprintf(fp, "%c", '\n');
				}
			}
		}
		else
			fprintf(fp, "%c", buffer[i]);
	}

	/* close & free */
	fclose(fp);
	free(buffer);
	return 0;
}
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Old Apr 27th, 2006, 5:33 AM   #6
nnxion
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Whoops my bad, left it to specify a file (debugging purposes).
Here the final version, 1.0:
(Toggle Plain Text) 
/*
stripc 1.0 - strips your comments.
Copyright (C) 2006 Ruben aka nnxion aka rubenisme (rubenisme.com)

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/
#include <stdio.h>
#include <stdlib.h>

#define bool int
#define false 0
#define true 1

/* trouble in River City (TM DaWei) */
int uhOh(char * message)
{
	fprintf(stderr, "%s\n", message);
	return 1;
}

/* main */
int main(int argc, char ** argv)
{
	int i;
	bool comment = false, block = false, qliteral = false;
	FILE * fp;
	long fsize;
	char * buffer;
	char * file;

	/* check arguments and get filename */
	if(argc != 2)
		return uhOh("Author: Ruben AKA Rubenisme(.com) AKA nnxion\nVersion: 1.0\nUsage: stripc <filename>\n");
	file = argv[1];

	/* open file */
	fp = fopen(file, "rb");
	if(fp == NULL)
		return uhOh("Could not open file.");

	/* obtain file size */
	fseek(fp, 0, SEEK_END);
	fsize = ftell(fp);
	rewind(fp);

	/* allocate memory */
	buffer = malloc(fsize);
	if(buffer == NULL)
		return uhOh("Could not allocate memory.");

	/* copy file into buffer */
	fread(buffer, 1, fsize, fp);
	fclose(fp);
	fp = fopen(file, "wb");
	if(fp == NULL)
		return uhOh("Could not open file.");

	/* loop through buffer */
	for(i = 0; i < fsize; i++)
	{
		if(!comment && !qliteral && (buffer[i] == '/' && (buffer[i+1] == '/' || buffer[i+1] == '*')))
		{
			comment = true;
			if(buffer[i+1] == '*')
				block = true;
			i++;
		}

		if(!comment && (buffer[i] == '"' || buffer[i] == '\''))
		{
			static bool squote = false, dblquote = false;
			if(buffer[i-1] != '\\' || buffer[i-2] != '\\')
				;
			else if(buffer[i] == '"' && !squote)
			{
				dblquote =! dblquote;
				qliteral =! qliteral;
			}
			else if(buffer[i] == '\'' && !dblquote)
			{
				squote =! squote;
				qliteral =! qliteral;
			}
		}

		if(comment && !qliteral)
		{
			if(block)
			{
				if(buffer[i] == '*' && buffer[i+1] == '/')
				{
					comment = false;
					block = false;
					i++;
				}
			}
			else
			{
				if(buffer[i] == '\n')
				{
					comment = false;
					fprintf(fp, "%c", '\n');
				}
			}
		}
		else
			fprintf(fp, "%c", buffer[i]);
	}

	/* close & free */
	fclose(fp);
	free(buffer);
	return 0;
}
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Old May 4th, 2006, 6:03 AM   #7
nnxion
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Well I _REALLY_ thought it was finished, until I wanted to strip multiple files of comments... I also changed it so one can see which file fails if it does.
(Toggle Plain Text) 
/*
stripc 1.0 - strips your comments.
Copyright (C) 2006 Ruben aka nnxion aka rubenisme (rubenisme.com)

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/
#include <stdio.h>
#include <stdlib.h>

#define bool int
#define false 0
#define true 1

/* trouble in River City (TM DaWei) */
int uhOh(char * message)
{
	fprintf(stderr, "%s\n", message);
	return 1;
}

/* main */
int main(int argc, char ** argv)
{
	int i;
	bool comment = false, block = false, qliteral = false;
	FILE * fp;
	long fsize;
	char * buffer;

	/* check arguments and get filename */
	if (argc == 1)
	   return uhOh("Author: Ruben AKA Rubenisme(.com) AKA nnxion\nVersion: 1.0\nUsage: stripc <filename(s)>\n");
	else
		while(--argc > 0)
		{
			/* open file */
			if((fp = fopen(*++argv, "rb")) == NULL)
			{
				fprintf(stderr, "stripc: could not open file %s for reading\n", *argv);
				return 1;
			}

			/* obtain file size */
			fseek(fp, 0, SEEK_END);
			fsize = ftell(fp);
			rewind(fp);

			/* allocate memory */
			if((buffer = malloc(fsize)) == NULL)
				return uhOh("Could not allocate memory.");

			/* copy file into buffer */
			fread(buffer, 1, fsize, fp);
			fclose(fp);
			if((fp = fopen(*argv, "wb")) == NULL)
			{
				fprintf(stderr, "stripc: could not open file %s for writing\n", *argv);
				return 1;
			}

			/* loop through buffer */
			for(i = 0; i < fsize; i++)
			{
				if(!comment && !qliteral && (buffer[i] == '/' && (buffer[i+1] == '/' || buffer[i+1] == '*')))
				{
					comment = true;
					if(buffer[i+1] == '*')
						block = true;
					i++;
				}

				if(!comment && (buffer[i] == '"' || buffer[i] == '\''))
				{
					static bool squote = false, dblquote = false;
					if(buffer[i-1] != '\\' || buffer[i-2] != '\\')
						;
					else if(buffer[i] == '"' && !squote)
					{
						dblquote =! dblquote;
						qliteral =! qliteral;
					}
					else if(buffer[i] == '\'' && !dblquote)
					{
						squote =! squote;
						qliteral =! qliteral;
					}
				}

				if(comment && !qliteral)
				{
					if(block)
					{
						if(buffer[i] == '*' && buffer[i+1] == '/')
						{
							comment = false;
							block = false;
							i++;
						}
					}
					else
					{
						if(buffer[i] == '\n')
						{
							comment = false;
							fprintf(fp, "%c", '\n');
						}
					}
				}
				else
					fprintf(fp, "%c", buffer[i]);
			}

			/* close & free */
			fclose(fp);
			free(buffer);
		}
	return 0;
}
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Old May 4th, 2006, 6:25 AM   #8
lectricpharaoh
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Quote:
Originally Posted by nnxion
Well I had a file which had a load of comments, and I wanted to get rid of them fast. So I made this program. Please comment for any enhancements or anything else.
Interesting, but wouldn't it be easier to just run it through the preprocessor with the appropriate switches? And yes, before you ask, I realize they are not actually removed, but are replaced with whitespace, but that should be good enough, right?
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Old May 4th, 2006, 7:04 AM   #9
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Quote:
Originally Posted by lectricpharaoh
Interesting, but wouldn't it be easier to just run it through the preprocessor with the appropriate switches? And yes, before you ask, I realize they are not actually removed, but are replaced with whitespace, but that should be good enough, right?
Yeah I guess that would be okay too, but the VC++ compiler will complain:
Quote:
la.cpp(4) : fatal error C1083: Can not open include file: 'iostream': No such file or directory
So I have to specify where it can find them.

It would also preprocess (read: remove) my macros and if I included headers it might really include them in the file.

And lastly if I'm somewhere without a compiler, and would still like to look at some code, but's it's so heavily commented that I can't see the forest for the trees, then I'd be stuck.
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