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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: io.c,v 1.11 2009/10/27 23:59:39 deraadt Exp $	*/

/*
 * Copyright (c) 1985 Sun Microsystems, Inc.
 * Copyright (c) 1980, 1993 The Regents of the University of California.
 * Copyright (c) 1976 Board of Trustees of the University of Illinois.
 * 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 <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <err.h>
#include "indent_globs.h"


int         comment_open;
static int  paren_target;

void
dump_line(void)
{				/* dump_line is the routine that actually
				 * effects the printing of the new source. It
				 * prints the label section, followed by the
				 * code section with the appropriate nesting
				 * level, followed by any comments */
    int         cur_col, target_col;
    static int  not_first_line;

    if (ps.procname[0]) {
	if (troff) {
	    if (comment_open) {
		comment_open = 0;
		fprintf(output, ".*/\n");
	    }
	    fprintf(output, ".Pr \"%s\"\n", ps.procname);
	}
	ps.ind_level = 0;
	ps.procname[0] = 0;
    }
    if (s_code == e_code && s_lab == e_lab && s_com == e_com) {
	if (suppress_blanklines > 0)
	    suppress_blanklines--;
	else {
	    ps.bl_line = true;
	    n_real_blanklines++;
	}
    }
    else if (!inhibit_formatting) {
	suppress_blanklines = 0;
	ps.bl_line = false;
	if (prefix_blankline_requested && not_first_line) {
	    if (swallow_optional_blanklines) {
		if (n_real_blanklines == 1)
		    n_real_blanklines = 0;
	    } else {
		if (n_real_blanklines == 0)
		    n_real_blanklines = 1;
	    }
	}
	while (--n_real_blanklines >= 0)
	    putc('\n', output);
	n_real_blanklines = 0;
	if (ps.ind_level == 0)
	    ps.ind_stmt = 0;	/* this is a class A kludge. dont do
				 * additional statement indentation if we are
				 * at bracket level 0 */

	if (e_lab != s_lab || e_code != s_code)
	    ++code_lines;	/* keep count of lines with code */


	if (e_lab != s_lab) {	/* print lab, if any */
	    if (comment_open) {
		comment_open = 0;
		fprintf(output, ".*/\n");
	    }
	    while (e_lab > s_lab && (e_lab[-1] == ' ' || e_lab[-1] == '\t'))
		e_lab--;
	    cur_col = pad_output(1, compute_label_target());
	    if (s_lab[0] == '#' && (strncmp(s_lab, "#else", 5) == 0
				    || strncmp(s_lab, "#endif", 6) == 0)) {
		char *s = s_lab;
		if (e_lab[-1] == '\n')
			e_lab--;
		do
			putc(*s++, output);
		while (s < e_lab && 'a' <= *s && *s<='z');
		while ((*s == ' ' || *s == '\t') && s < e_lab)
		    s++;
		if (s < e_lab)
		    fprintf(output, s[0]=='/' && s[1]=='*' ? "\t%.*s" : "\t/* %.*s */",
			    (int)(e_lab - s), s);
	    }
	    else fprintf(output, "%.*s", (int)(e_lab - s_lab), s_lab);
	    cur_col = count_spaces(cur_col, s_lab);
	}
	else
	    cur_col = 1;	/* there is no label section */

	ps.pcase = false;

	if (s_code != e_code) {	/* print code section, if any */
	    char *p;

	    if (comment_open) {
		comment_open = 0;
		fprintf(output, ".*/\n");
	    }
	    target_col = compute_code_target();
	    {
		int  i;

		for (i = 0; i < ps.p_l_follow; i++)
		    if (ps.paren_indents[i] >= 0)
			ps.paren_indents[i] = -(ps.paren_indents[i] + target_col);
	    }
	    cur_col = pad_output(cur_col, target_col);
	    for (p = s_code; p < e_code; p++)
		if (*p == (char) 0200)
		    fprintf(output, "%d", target_col * 7);
		else
		    putc(*p, output);
	    cur_col = count_spaces(cur_col, s_code);
	}
	if (s_com != e_com) {
	    if (troff) {
		int   all_here = 0;
		char *p;

		if (e_com[-1] == '/' && e_com[-2] == '*')
		    e_com -= 2, all_here++;
		while (e_com > s_com && e_com[-1] == ' ')
		    e_com--;
		*e_com = 0;
		p = s_com;
		while (*p == ' ')
		    p++;
		if (p[0] == '/' && p[1] == '*')
		    p += 2, all_here++;
		else if (p[0] == '*')
		    p += p[1] == '/' ? 2 : 1;
		while (*p == ' ')
		    p++;
		if (*p == 0)
		    goto inhibit_newline;
		if (comment_open < 2 && ps.box_com) {
		    comment_open = 0;
		    fprintf(output, ".*/\n");
		}
		if (comment_open == 0) {
		    if ('a' <= *p && *p <= 'z')
			*p = *p + 'A' - 'a';
		    if (e_com - p < 50 && all_here == 2) {
			char *follow = p;
			fprintf(output, "\n.nr C! \\w\1");
			while (follow < e_com) {
			    switch (*follow) {
			    case '\n':
				putc(' ', output);
			    case 1:
				break;
			    case '\\':
				putc('\\', output);
			    default:
				putc(*follow, output);
			    }
			    follow++;
			}
			putc(1, output);
		    }
		    fprintf(output, "\n./* %dp %d %dp\n",
			    ps.com_col * 7,
			    (s_code != e_code || s_lab != e_lab) - ps.box_com,
			    target_col * 7);
		}
		comment_open = 1 + ps.box_com;
		while (*p) {
		    if (*p == BACKSLASH)
			putc(BACKSLASH, output);
		    putc(*p++, output);
		}
	    } else {		/* print comment, if any */
		int   target = ps.com_col;
		char *com_st = s_com;

		target += ps.comment_delta;
		while (*com_st == '\t')
		    com_st++, target += 8;	/* ? */
		while (target <= 0)
		    if (*com_st == ' ')
			target++, com_st++;
		    else if (*com_st == '\t')
			target = ((target - 1) & ~7) + 9, com_st++;
		    else
			target = 1;
		if (cur_col > target) {	/* if comment cant fit on this line,
					 * put it on next line */
		    putc('\n', output);
		    cur_col = 1;
		    ++ps.out_lines;
		}
		while (e_com > com_st && isspace(e_com[-1]))
		    e_com--;
		cur_col = pad_output(cur_col, target);
		if (!ps.box_com) {
		    if (star_comment_cont && (com_st[1] != '*' || e_com <= com_st + 1)) {
			if (com_st[1] == ' ' && com_st[0] == ' ' && e_com > com_st + 1)
			    com_st[1] = '*';
			else
			    fwrite(" * ", com_st[0] == '\t' ? 2 : com_st[0] == '*' ? 1 : 3, 1, output);
		    }
		}
		fwrite(com_st, e_com - com_st, 1, output);
		ps.comment_delta = ps.n_comment_delta;
		cur_col = count_spaces(cur_col, com_st);
		++ps.com_lines;	/* count lines with comments */
	    }
	}
	if (ps.use_ff)
	    putc('\014', output);
	else
	    putc('\n', output);
inhibit_newline:
	++ps.out_lines;
	if (ps.just_saw_decl == 1 && blanklines_after_declarations) {
	    prefix_blankline_requested = 1;
	    ps.just_saw_decl = 0;
	}
	else
	    prefix_blankline_requested = postfix_blankline_requested;
	postfix_blankline_requested = 0;
    }
    ps.decl_on_line = ps.in_decl;	/* if we are in the middle of a
					 * declaration, remember that fact for
					 * proper comment indentation */
    ps.ind_stmt = ps.in_stmt & ~ps.in_decl;	/* next line should be
						 * indented if we have not
						 * completed this stmt and if
						 * we are not in the middle of
						 * a declaration */
    ps.use_ff = false;
    ps.dumped_decl_indent = 0;
    *(e_lab = s_lab) = '\0';	/* reset buffers */
    *(e_code = s_code) = '\0';
    *(e_com = s_com) = '\0';
    ps.ind_level = ps.i_l_follow;
    ps.paren_level = ps.p_l_follow;
    paren_target = -ps.paren_indents[ps.paren_level - 1];
    not_first_line = 1;
    return;
}

int
compute_code_target(void)
{
    int target_col;

    target_col = ps.ind_size * ps.ind_level + 1;
    if (ps.paren_level)
	if (!lineup_to_parens)
	    target_col += continuation_indent * ps.paren_level;
	else {
	    int    w;
	    int    t = paren_target;

	    if ((w = count_spaces(t, s_code) - max_col) > 0
		    && count_spaces(target_col, s_code) <= max_col) {
		t -= w + 1;
		if (t > target_col)
		    target_col = t;
	    }
	    else
		target_col = t;
	}
    else if (ps.ind_stmt)
	target_col += continuation_indent;
    return target_col;
}

int
compute_label_target(void)
{
    return
	ps.pcase ? (int) (case_ind * ps.ind_size) + 1
	: *s_lab == '#' ? 1
	: ps.ind_size * (ps.ind_level - label_offset) + 1;
}


/*
 * Copyright (C) 1976 by the Board of Trustees of the University of Illinois
 * 
 * All rights reserved
 * 
 * 
 * NAME: fill_buffer
 * 
 * FUNCTION: Reads one block of input into input_buffer
 * 
 * HISTORY: initial coding 	November 1976	D A Willcox of CAC 1/7/77 A
 * Willcox of CAC	Added check for switch back to partly full input
 * buffer from temporary buffer
 * 
 */
void
fill_buffer(void)
{				/* this routine reads stuff from the input */
    char *p, *buf2;
    int i;
    FILE *f = input;

    if (bp_save != 0) {		/* there is a partly filled input buffer left */
	buf_ptr = bp_save;	/* dont read anything, just switch buffers */
	buf_end = be_save;
	bp_save = be_save = 0;
	if (buf_ptr < buf_end)
	    return;		/* only return if there is really something in
				 * this buffer */
    }
    for (p = in_buffer;;) {
	if (p >= in_buffer_limit) {
	    int size = (in_buffer_limit - in_buffer) * 2 + 10;
	    int offset = p - in_buffer;
	    buf2 = realloc(in_buffer, size);
	    if (buf2 == NULL)
		errx(1, "input line too long");
	    in_buffer = buf2;
	    p = in_buffer + offset;
	    in_buffer_limit = in_buffer + size - 2;
	}
	if ((i = getc(f)) == EOF) {
		*p++ = ' ';
		*p++ = '\n';
		had_eof = true;
		break;
	}
	*p++ = i;
	if (i == '\n')
		break;
    }
    buf_ptr = in_buffer;
    buf_end = p;
    if (p - 3 >= in_buffer && p[-2] == '/' && p[-3] == '*') {
	if (in_buffer[3] == 'I' && strncmp(in_buffer, "/**INDENT**", 11) == 0)
	    fill_buffer();	/* flush indent error message */
	else {
	    int         com = 0;

	    p = in_buffer;
	    while (*p == ' ' || *p == '\t')
		p++;
	    if (*p == '/' && p[1] == '*') {
		p += 2;
		while (*p == ' ' || *p == '\t')
		    p++;
		if (p[0] == 'I' && p[1] == 'N' && p[2] == 'D' && p[3] == 'E'
			&& p[4] == 'N' && p[5] == 'T') {
		    p += 6;
		    while (*p == ' ' || *p == '\t')
			p++;
		    if (*p == '*')
			com = 1;
		    else if (*p == 'O') {
			if (*++p == 'N')
			    p++, com = 1;
			else if (*p == 'F' && *++p == 'F')
			    p++, com = 2;
		    }
		    while (*p == ' ' || *p == '\t')
			p++;
		    if (p[0] == '*' && p[1] == '/' && p[2] == '\n' && com) {
			if (s_com != e_com || s_lab != e_lab || s_code != e_code)
			    dump_line();
			if (!(inhibit_formatting = com - 1)) {
			    n_real_blanklines = 0;
			    postfix_blankline_requested = 0;
			    prefix_blankline_requested = 0;
			    suppress_blanklines = 1;
			}
		    }
		}
	    }
	}
    }
    if (inhibit_formatting) {
	p = in_buffer;
	do
	    putc(*p, output);
	while (*p++ != '\n');
    }
    return;
}

/*
 * Copyright (C) 1976 by the Board of Trustees of the University of Illinois
 * 
 * All rights reserved
 * 
 * 
 * NAME: pad_output
 * 
 * FUNCTION: Writes tabs and spaces to move the current column up to the desired
 * position.
 * 
 * ALGORITHM: Put tabs and/or blanks into pobuf, then write pobuf.
 * 
 * PARAMETERS: current		integer		The current column target
 *             target 		integer		The desired column
 * 
 * RETURNS: Integer value of the new column.  (If current >= target, no action is
 * taken, and current is returned.
 * 
 * GLOBALS: None
 * 
 * CALLS: write (sys)
 * 
 * CALLED BY: dump_line
 * 
 * HISTORY: initial coding 	November 1976	D A Willcox of CAC
 * 
 */
int
pad_output(int current, int target)
{
    int curr;		/* internal column pointer */
    int tcur;

    if (troff)
	fprintf(output, "\\h'|%dp'", (target - 1) * 7);
    else {
	if (current >= target)
	    return (current);	/* line is already long enough */
	curr = current;
	while ((tcur = ((curr - 1) & tabmask) + tabsize + 1) <= target) {
	    putc('\t', output);
	    curr = tcur;
	}
	while (curr++ < target)
	    putc(' ', output);	/* pad with final blanks */
    }
    return (target);
}

/*
 * Copyright (C) 1976 by the Board of Trustees of the University of Illinois
 * 
 * All rights reserved
 * 
 * 
 * NAME: count_spaces
 * 
 * FUNCTION: Find out where printing of a given string will leave the current
 * character position on output.
 * 
 * ALGORITHM: Run thru input string and add appropriate values to current
 * position.
 * 
 * RETURNS: Integer value of position after printing "buffer" starting in column
 * "current".
 * 
 * HISTORY: initial coding 	November 1976	D A Willcox of CAC
 * 
 */
int
count_spaces(int current, char *buffer)
{
    char *buf;		/* used to look thru buffer */
    int cur;		/* current character counter */

    cur = current;

    for (buf = buffer; *buf != '\0'; ++buf) {
	switch (*buf) {

	case '\n':
	case 014:		/* form feed */
	    cur = 1;
	    break;

	case '\t':
	    cur = ((cur - 1) & tabmask) + tabsize + 1;
	    break;

	case 010:		/* backspace */
	    --cur;
	    break;

	default:
	    ++cur;
	    break;
	}			/* end of switch */
    }				/* end of for loop */
    return (cur);
}

int	found_err;

/* VARARGS2 */
void
diag(int level, char *msg, ...)
{
    va_list ap;

    va_start(ap, msg);
    if (level)
	found_err = 1;
    if (output == stdout) {
	fprintf(stdout, "/**INDENT** %s@%d: ", level == 0 ? "Warning" : "Error", line_no);
	vfprintf(stdout, msg, ap);
	fprintf(stdout, " */\n");
    }
    else {
	fprintf(stderr, "%s@%d: ", level == 0 ? "Warning" : "Error", line_no);
	vfprintf(stderr, msg, ap);
	fprintf(stderr, "\n");
    }
    va_end(ap);
}

void
writefdef(struct fstate *f, int nm)
{
    fprintf(output, ".ds f%c %s\n.nr s%c %d\n",
	    nm, f->font, nm, f->size);
}

char       *
chfont(struct fstate *of, struct fstate *nf, char *s)
{
    if (of->font[0] != nf->font[0]
	    || of->font[1] != nf->font[1]) {
	*s++ = '\\';
	*s++ = 'f';
	if (nf->font[1]) {
	    *s++ = '(';
	    *s++ = nf->font[0];
	    *s++ = nf->font[1];
	}
	else
	    *s++ = nf->font[0];
    }
    if (nf->size != of->size) {
	*s++ = '\\';
	*s++ = 's';
	if (nf->size < of->size) {
	    *s++ = '-';
	    *s++ = '0' + of->size - nf->size;
	}
	else {
	    *s++ = '+';
	    *s++ = '0' + nf->size - of->size;
	}
    }
    return s;
}

void
parsefont(struct fstate *f, char *s0)
{
    char *s = s0;
    int         sizedelta = 0;
    bzero(f, sizeof *f);
    while (*s) {
	if (isdigit(*s))
	    f->size = f->size * 10 + *s - '0';
	else if (isupper(*s))
	    if (f->font[0])
		f->font[1] = *s;
	    else
		f->font[0] = *s;
	else if (*s == 'c')
	    f->allcaps = 1;
	else if (*s == '+')
	    sizedelta++;
	else if (*s == '-')
	    sizedelta--;
	else
	    errx(1, "bad font specification: %s", s0);
	s++;
    }
    if (f->font[0] == 0)
	f->font[0] = 'R';
    if (bodyf.size == 0)
	bodyf.size = 11;
    if (f->size == 0)
	f->size = bodyf.size + sizedelta;
    else if (sizedelta > 0)
	f->size += bodyf.size;
    else
	f->size = bodyf.size - f->size;
}