delete comments in .c file

[Timex]

I want to delete all comments in .c file.

Size of .c file is very big.

Any good idea to do this?

Please show me example code.

[Tim Hagan]

Jeremy Yallop wrote:

Tim Hagan wrote:

This will replace each /* ... */ style comment with a single space:

#include<stdio. h>
int main(void){i\
nt c,p=-1,k=0,s=0
;while((c=getch ar
())!=EOF){if(s= =0
){if(p=='/'&&c==
'*'){s=1;k=2;}e l\
se if(c=='\"'&&p
!='\\'&&p!='\'' )s
=2;}else if(s==1)
{if (p=='*'&&c==
'/')s=0;}else if(
s==2){if(c=='\" '
&&p!='\\')s=0;} if
(k==1)putchar(' '
);if(p>0&&s!=1) {
if(!k)putchar(p );
if(--k<0)k=0;}p=c
;}putchar(p);re t\
urn 0;}

It doesn't handle line-splicing. Also, putchar(-1) is not portable.

putchar(-1) is never executed in the above code, but you're right
about the line-splicing. Oh, well, back to the drawing board ...

--
Tim Hagan

[Nudge]

>> I want to delete all comments in .c file.

Size of .c file is very big.

You work for SCO's Linux division, don't you?

<GRIN>

[Jeremy Yallop]

Tim Hagan wrote:

Jeremy Yallop wrote:

Tim Hagan wrote:

> This will replace each /* ... */ style comment with a single space:
>
> #include<stdio. h>
> int main(void){i\
> nt c,p=-1,k=0,s=0
> ;while((c=getch ar
> ())!=EOF){if(s= =0
> ){if(p=='/'&&c==
> '*'){s=1;k=2;}e l\
> se if(c=='\"'&&p
> !='\\'&&p!='\'' )s
>=2;}else if(s==1)
> {if (p=='*'&&c==
> '/')s=0;}else if(
> s==2){if(c=='\" '
> &&p!='\\')s=0;} if
> (k==1)putchar(' '
> );if(p>0&&s!=1) {
> if(!k)putchar(p );
> if(--k<0)k=0;}p=c
> ;}putchar(p);re t\
> urn 0;}

It doesn't handle line-splicing. Also, putchar(-1) is not portable.

putchar(-1) is never executed in the above code

putchar(-1) is executed if EOF is encountered immediately.

Jeremy.

[Christopher Benson-Manica]

Jeremy Yallop <je****@jdyallo p.freeserve.co. uk> spoke thus:

putchar(-1) is executed if EOF is encountered immediately.

Why would one want to write putchar(-1) anyway...?

--
Christopher Benson-Manica | I *should* know what I'm talking about - if I
ataru(at)cybers pace.org | don't, I need to know. Flames welcome.

[Mark A. Odell]

"Timex" <su********@hot mail.com> wrote in
news:bn******** **@news.kreonet .re.kr:

I want to delete all comments in .c file.

Size of .c file is very big.

Any good idea to do this?

Please show me example code.

Just grab an evaluation copy of Codewright from Borland. Do a
search-replace on . <-- regexp and restrict "to comments" with a
replacement string of nothing. I just did it to a very large file in about
5 seconds. Now what does this have to do with the C language? The C
language does not specify how to delete comments.

--
- Mark ->
--

[Tim Hagan]

Jeremy Yallop wrote:

Tim Hagan wrote:

Jeremy Yallop wrote:

Tim Hagan wrote:
> This will replace each /* ... */ style comment with a single space:
>
> #include<stdio. h>
> int main(void){i\
> nt c,p=-1,k=0,s=0
> ;while((c=getch ar
> ())!=EOF){if(s= =0
> ){if(p=='/'&&c==
> '*'){s=1;k=2;}e l\
> se if(c=='\"'&&p
> !='\\'&&p!='\'' )s
>=2;}else if(s==1)
> {if (p=='*'&&c==
> '/')s=0;}else if(
> s==2){if(c=='\" '
> &&p!='\\')s=0;} if
> (k==1)putchar(' '
> );if(p>0&&s!=1) {
> if(!k)putchar(p );
> if(--k<0)k=0;}p=c
> ;}putchar(p);re t\
> urn 0;}

It doesn't handle line-splicing. Also, putchar(-1) is not portable.
putchar(-1) is never executed in the above code

.... unless one tries to remove the comments from an empty file. :-)
putchar(-1) is executed if EOF is encountered immediately.

So just insert 'if (p > 0)' before the final putchar.

--
Tim Hagan

[Richard Heathfield]

Mark A. Odell wrote:

Now what does this have to do with the C language? The C
language does not specify how to delete comments.

The Standard says: "Each comment is replaced by one space character." If
that doesn't specify how to delete comments, I don't know what does.

--
Richard Heathfield : bi****@eton.pow ernet.co.uk
"Usenet is a strange place." - Dennis M Ritchie, 29 July 1999.
C FAQ: http://www.eskimo.com/~scs/C-faq/top.html
K&R answers, C books, etc: http://users.powernet.co.uk/eton

[Mark McIntyre]

On Fri, 31 Oct 2003 22:47:18 +0000 (UTC), in comp.lang.c , Richard
Heathfield <do******@addre ss.co.uk.invali d> wrote:

Mark A. Odell wrote:

Now what does this have to do with the C language? The C
language does not specify how to delete comments.

The Standard says: "Each comment is replaced by one space character." If
that doesn't specify how to delete comments, I don't know what does.

I guess Mark's point is that to be sure of being syntactically
identical to the original you should replace all comments by a space.
For instance
int i = 23/* */12;
should still generate a syntax error . :-)

What the OP would expect it to do with
double i = 32 //* */ 4
;
is anyone's guess. I guess you'd have to have a C99 and a C89 mode.
--
Mark McIntyre
CLC FAQ <http://www.eskimo.com/~scs/C-faq/top.html>
CLC readme: <http://www.angelfire.c om/ms3/bchambless0/welcome_to_clc. html>
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[Stephen Samuel]

Here's a perl script which will handle *MOST* sane C code...

Some things that it will miss (scan manually for it first:

a double quote inside of single quotes (e.g.)
char confusion = '"';

C-99 // comments like this

I'm sure that some people can come up with other convoluted counter-examples.

It reads and plays with the entire file, so it will need to hold
at least two or three copies of it in RAM. (for today's computers,
that would be some number of megabytes).

If you want any of the above fixed, feel free to send me a cheque.
_______________ _______________ _______________ _______
#!/usr/bin/perl
$s=join("",<>);
# printf "[[%s]]\n\n",$s;
$s=~ s/("(\\\\|\\"|[^"])*")|(\/\*([^*]|\*(?=[^\/]))*\*\/)|(\/\/.*)/[[$1 ]]/g;
printf "[[%s]]\n\n",$s;
_______________ _______________ _______________ _______
Yep, That's it... 5 lines including the shell header.

Timex wrote:

I want to delete all comments in .c file.

Size of .c file is very big.

Any good idea to do this?

Please show me example code.

--
Stephen Samuel [phone] sa****@bcgreen. com
http://www.bcgreen.com/~samuel/
Powerful committed communication. Transformation touching
the jewel within each person and bringing it to light.

[Irrwahn Grausewitz]

Stephen Samuel <st************ @telus.net> wrote:

Here's a perl script which will handle *MOST* sane C code...

<snip>

Since when is perl topical in c.l.c?

BTW:
Does your "solution" account for comment delimiters inside string
literals? (I'm unfortunately unable to decrypt the line-noise
provided.)

Regards
--
Irrwahn
(ir*******@free net.de)