/* 
 * C comment ispell filter
 * Reads C source from stdin, outputs noncomments as spaces, outputs comments verbatim.
 * Output is exact same length as input, as required by Ispell.
 * To be used with International Ispell's -F option.
 * Copyright 2003, Dan Kegel.  Licensed under GPL.
 */
#include <stdio.h>
 
void output(char c)
{
	/* don't output asterisks, it confuses some spellcheckers */
	if (c == '*')
		c = ' ';

	putchar(c);
}

int
main(int argc, char **argv)
{
	int c;
	enum state_t { NONCOMMENT, SLASH, COMMENT, STAR, EOLCOMMENT };
	enum state_t state = NONCOMMENT;
	while ((c = getchar()) != EOF) {
		switch (state) {
		case NONCOMMENT:
			if (c == '/')
				state = SLASH;
			if (c == '\n')
				output('\n');
			else
				output(' ');
			break;
		case SLASH:
			if (c == '*')
				state = COMMENT;
			else if (c == '/')
				state = EOLCOMMENT;
			else {
				state = NONCOMMENT;
			}
			output(' ');
			break;
		case COMMENT:
			if (c == '*')
				state = STAR;
			output(c);
			break;
		case STAR:
			if (c == '/')
				state = NONCOMMENT;
			else if (c != '*')
				state = COMMENT;
			output(c);
			break;
		case EOLCOMMENT:
			if (c == '\n')
				state = NONCOMMENT;
			output(c);
			break;
		}
	}
	return 0;
}