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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: pr_comment.c,v 1.7 2009/10/27 23:59:39 deraadt Exp $	*/

/*
 * Copyright (c) 1980, 1993
 *	The Regents of the University of California.
 * Copyright (c) 1976 Board of Trustees of the University of Illinois.
 * Copyright (c) 1985 Sun Microsystems, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include "indent_globs.h"

/*
 * NAME:
 *	pr_comment
 *
 * FUNCTION:
 *	This routine takes care of scanning and printing comments.
 *
 * ALGORITHM:
 *	1) Decide where the comment should be aligned, and if lines should
 *	   be broken.
 *	2) If lines should not be broken and filled, just copy up to end of
 *	   comment.
 *	3) If lines should be filled, then scan thru input_buffer copying
 *	   characters to com_buf.  Remember where the last blank, tab, or
 *	   newline was.  When line is filled, print up to last blank and
 *	   continue copying.
 *
 * HISTORY:
 *	November 1976	D A Willcox of CAC	Initial coding
 *	12/6/76		D A Willcox of CAC	Modification to handle
 *						UNIX-style comments
 *
 */

/*
 * this routine processes comments.  It makes an attempt to keep comments from
 * going over the max line length.  If a line is too long, it moves everything
 * from the last blank to the next comment line.  Blanks and tabs from the
 * beginning of the input line are removed
 */

void
pr_comment(void)
{
    int         now_col;	/* column we are in now */
    int         adj_max_col;	/* Adjusted max_col for when we decide to
				 * spill comments over the right margin */
    char       *last_bl;	/* points to the last blank in the output
				 * buffer */
    char       *t_ptr;		/* used for moving string */
    int         unix_comment;	/* tri-state variable used to decide if it is
				 * a unix-style comment. 0 means only blanks
				 * since / *, 1 means regular style comment, 2
				 * means unix style comment */
    int         break_delim = comment_delimiter_on_blankline;
    int         l_just_saw_decl = ps.just_saw_decl;
    /*
     * int         ps.last_nl = 0;	 true iff the last significant thing
     * we've seen is a newline
     */
    int         one_liner = 1;	/* true iff this comment is a one-liner */
    adj_max_col = max_col;
    ps.just_saw_decl = 0;
    last_bl = 0;		/* no blanks found so far */
    ps.box_com = false;		/* at first, assume that we are not in
				 * a boxed comment or some other
				 * comment that should not be touched */
    ++ps.out_coms;		/* keep track of number of comments */
    unix_comment = 1;		/* set flag to let us figure out if there is a
				 * unix-style comment ** DISABLED: use 0 to
				 * reenable this hack! */

    /* Figure where to align and how to treat the comment */

    if (ps.col_1 && !format_col1_comments) {	/* if comment starts in column
						 * 1 it should not be touched */
	ps.box_com = true;
	ps.com_col = 1;
    }
    else {
	if (*buf_ptr == '-' || *buf_ptr == '*' || *buf_ptr == '\n') {
	    ps.box_com = true;	/* a comment with a '-', '*' or newline
				 * immediately after the / * is assumed to be
				 * a boxed comment */
	    break_delim = 0;
	}
	if ( /* ps.bl_line && */ (s_lab == e_lab) && (s_code == e_code)) {
	    /* klg: check only if this line is blank */
	    /*
	     * If this (*and previous lines are*) blank, don't put comment way
	     * out at left
	     */
	    ps.com_col = (ps.ind_level - ps.unindent_displace) * ps.ind_size + 1;
	    adj_max_col = block_comment_max_col;
	    if (ps.com_col <= 1)
		ps.com_col = 1 + !format_col1_comments;
	}
	else {
	    int    target_col;
	    break_delim = 0;
	    if (s_code != e_code)
		target_col = count_spaces(compute_code_target(), s_code);
	    else {
		target_col = 1;
		if (s_lab != e_lab)
		    target_col = count_spaces(compute_label_target(), s_lab);
	    }
	    ps.com_col = ps.decl_on_line || ps.ind_level == 0 ? ps.decl_com_ind : ps.com_ind;
	    if (ps.com_col < target_col)
		ps.com_col = ((target_col + 7) & ~7) + 1;
	    if (ps.com_col + 24 > adj_max_col)
		adj_max_col = ps.com_col + 24;
	}
    }
    if (ps.box_com) {
	buf_ptr[-2] = 0;
	ps.n_comment_delta = 1 - count_spaces(1, in_buffer);
	buf_ptr[-2] = '/';
    }
    else {
	ps.n_comment_delta = 0;
	while (*buf_ptr == ' ' || *buf_ptr == '\t')
	    buf_ptr++;
    }
    ps.comment_delta = 0;
    *e_com++ = '/';		/* put '/ *' into buffer */
    *e_com++ = '*';
    if (*buf_ptr != ' ' && !ps.box_com)
	*e_com++ = ' ';

    *e_com = '\0';
    if (troff) {
	now_col = 1;
	adj_max_col = 80;
    }
    else
	now_col = count_spaces(ps.com_col, s_com);	/* figure what column we
							 * would be in if we
							 * printed the comment
							 * now */

    /* Start to copy the comment */

    while (1) {			/* this loop will go until the comment is
				 * copied */
	if (*buf_ptr > 040 && *buf_ptr != '*')
	    ps.last_nl = 0;
	CHECK_SIZE_COM;
	switch (*buf_ptr) {	/* this checks for various spcl cases */
	case 014:		/* check for a form feed */
	    if (!ps.box_com) {	/* in a text comment, break the line here */
		ps.use_ff = true;
		/* fix so dump_line uses a form feed */
		dump_line();
		last_bl = 0;
		*e_com++ = ' ';
		*e_com++ = '*';
		*e_com++ = ' ';
		while (*++buf_ptr == ' ' || *buf_ptr == '\t');
	    }
	    else {
		if (++buf_ptr >= buf_end)
		    fill_buffer();
		*e_com++ = 014;
	    }
	    break;

	case '\n':
	    if (had_eof) {	/* check for unexpected eof */
		printf("Unterminated comment\n");
		*e_com = '\0';
		dump_line();
		return;
	    }
	    one_liner = 0;
	    if (ps.box_com || ps.last_nl) {	/* if this is a boxed comment,
						 * we don't ignore the newline
						 */
		if (s_com == e_com) {
		    *e_com++ = ' ';
		    *e_com++ = ' ';
		}
		*e_com = '\0';
		if (!ps.box_com && e_com - s_com > 3) {
		    if (break_delim == 1 && s_com[0] == '/'
			    && s_com[1] == '*' && s_com[2] == ' ') {
			char       *t = e_com;
			break_delim = 2;
			e_com = s_com + 2;
			*e_com = 0;
			if (blanklines_before_blockcomments)
			    prefix_blankline_requested = 1;
			dump_line();
			e_com = t;
			s_com[0] = s_com[1] = s_com[2] = ' ';
		    }
		    dump_line();
		    CHECK_SIZE_COM;
		    *e_com++ = ' ';
		    *e_com++ = ' ';
		}
		dump_line();
		now_col = ps.com_col;
	    }
	    else {
		ps.last_nl = 1;
		if (unix_comment != 1) {	/* we not are in unix_style
						 * comment */
		    if (unix_comment == 0 && s_code == e_code) {
			/*
			 * if it is a UNIX-style comment, ignore the
			 * requirement that previous line be blank for
			 * unindention
			 */
			ps.com_col = (ps.ind_level - ps.unindent_displace) * ps.ind_size + 1;
			if (ps.com_col <= 1)
			    ps.com_col = 2;
		    }
		    unix_comment = 2;	/* permanently remember that we are in
					 * this type of comment */
		    dump_line();
		    ++line_no;
		    now_col = ps.com_col;
		    *e_com++ = ' ';
		    /*
		     * fix so that the star at the start of the line will line
		     * up
		     */
		    do		/* flush leading white space */
			if (++buf_ptr >= buf_end)
			    fill_buffer();
		    while (*buf_ptr == ' ' || *buf_ptr == '\t');
		    break;
		}
		if (*(e_com - 1) == ' ' || *(e_com - 1) == '\t')
		    last_bl = e_com - 1;
		/*
		 * if there was a space at the end of the last line, remember
		 * where it was
		 */
		else {		/* otherwise, insert one */
		    last_bl = e_com;
		    CHECK_SIZE_COM;
		    *e_com++ = ' ';
		    ++now_col;
		}
	    }
	    ++line_no;		/* keep track of input line number */
	    if (!ps.box_com) {
		int         nstar = 1;
		do {		/* flush any blanks and/or tabs at start of
				 * next line */
		    if (++buf_ptr >= buf_end)
			fill_buffer();
		    if (*buf_ptr == '*' && --nstar >= 0) {
			if (++buf_ptr >= buf_end)
			    fill_buffer();
			if (*buf_ptr == '/')
			    goto end_of_comment;
		    }
		} while (*buf_ptr == ' ' || *buf_ptr == '\t');
	    }
	    else if (++buf_ptr >= buf_end)
		fill_buffer();
	    break;		/* end of case for newline */

	case '*':		/* must check for possibility of being at end
				 * of comment */
	    if (++buf_ptr >= buf_end)	/* get to next char after * */
		fill_buffer();

	    if (unix_comment == 0)	/* set flag to show we are not in
					 * unix-style comment */
		unix_comment = 1;

	    if (*buf_ptr == '/') {	/* it is the end!!! */
	end_of_comment:
		if (++buf_ptr >= buf_end)
		    fill_buffer();

		if (*(e_com - 1) != ' ' && !ps.box_com) {	/* insure blank before
								 * end */
		    *e_com++ = ' ';
		    ++now_col;
		}
		if (break_delim == 1 && !one_liner && s_com[0] == '/'
			&& s_com[1] == '*' && s_com[2] == ' ') {
		    char       *t = e_com;
		    break_delim = 2;
		    e_com = s_com + 2;
		    *e_com = 0;
		    if (blanklines_before_blockcomments)
			prefix_blankline_requested = 1;
		    dump_line();
		    e_com = t;
		    s_com[0] = s_com[1] = s_com[2] = ' ';
		}
		if (break_delim == 2 && e_com > s_com + 3
			 /* now_col > adj_max_col - 2 && !ps.box_com */ ) {
		    *e_com = '\0';
		    dump_line();
		    now_col = ps.com_col;
		}
		CHECK_SIZE_COM;
		*e_com++ = '*';
		*e_com++ = '/';
		*e_com = '\0';
		ps.just_saw_decl = l_just_saw_decl;
		return;
	    }
	    else {		/* handle isolated '*' */
		*e_com++ = '*';
		++now_col;
	    }
	    break;
	default:		/* we have a random char */
	    if (unix_comment == 0 && *buf_ptr != ' ' && *buf_ptr != '\t')
		unix_comment = 1;	/* we are not in unix-style comment */

	    *e_com = *buf_ptr++;
	    if (buf_ptr >= buf_end)
		fill_buffer();

	    if (*e_com == '\t')	/* keep track of column */
		now_col = ((now_col - 1) & tabmask) + tabsize + 1;
	    else if (*e_com == '\b')	/* this is a backspace */
		--now_col;
	    else
		++now_col;

	    if (*e_com == ' ' || *e_com == '\t')
		last_bl = e_com;
	    /* remember we saw a blank */

	    ++e_com;
	    if (now_col > adj_max_col && !ps.box_com && unix_comment == 1 && e_com[-1] > ' ') {
		/*
		 * the comment is too long, it must be broken up
		 */
		if (break_delim == 1 && s_com[0] == '/'
			&& s_com[1] == '*' && s_com[2] == ' ') {
		    char       *t = e_com;
		    break_delim = 2;
		    e_com = s_com + 2;
		    *e_com = 0;
		    if (blanklines_before_blockcomments)
			prefix_blankline_requested = 1;
		    dump_line();
		    e_com = t;
		    s_com[0] = s_com[1] = s_com[2] = ' ';
		}
		if (last_bl == 0) {	/* we have seen no blanks */
		    last_bl = e_com;	/* fake it */
		    *e_com++ = ' ';
		}
		*e_com = '\0';	/* print what we have */
		*last_bl = '\0';
		while (last_bl > s_com && last_bl[-1] < 040)
		    *--last_bl = 0;
		e_com = last_bl;
		dump_line();

		*e_com++ = ' ';	/* add blanks for continuation */
		*e_com++ = ' ';
		*e_com++ = ' ';

		t_ptr = last_bl + 1;
		last_bl = 0;
		if (t_ptr >= e_com) {
		    while (*t_ptr == ' ' || *t_ptr == '\t')
			t_ptr++;
		    while (*t_ptr != '\0') {	/* move unprinted part of
						 * comment down in buffer */
			if (*t_ptr == ' ' || *t_ptr == '\t')
			    last_bl = e_com;
			*e_com++ = *t_ptr++;
		    }
		}
		*e_com = '\0';
		now_col = count_spaces(ps.com_col, s_com);	/* recompute current
								 * position */
	    }
	    break;
	}
    }
}