xref: /src/usr.bin/indent/indent.c

/*	$NetBSD: indent.c,v 1.12 2001/08/20 12:00:55 wiz Exp $	*/

/*
 * Copyright (c) 1980, 1993
 *	The Regents of the University of California.  All rights reserved.
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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 <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1985 Sun Microsystems, Inc.\n\
@(#) Copyright (c) 1976 Board of Trustees of the University of Illinois.\n\
@(#) Copyright (c) 1980, 1993\n\
	The Regents of the University of California.  All rights reserved.\n");
#endif				/* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)indent.c	5.17 (Berkeley) 6/7/93";
#else
__RCSID("$NetBSD: indent.c,v 1.12 2001/08/20 12:00:55 wiz Exp $");
#endif
#endif				/* not lint */

#include <sys/param.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define EXTERN
#include "indent_globs.h"
#undef  EXTERN
#include "indent_codes.h"

char   *in_name = "Standard Input";	/* will always point to name of input
					 * file */
char   *out_name = "Standard Output";	/* will always point to name of output
					 * file */
char    bakfile[MAXPATHLEN] = "";

int main __P((int, char **));

int
main(argc, argv)
	int     argc;
	char  **argv;
{

	extern int found_err;	/* flag set in diag() on error */
	int     dec_ind;	/* current indentation for declarations */
	int     di_stack[20];	/* a stack of structure indentation levels */
	int     flushed_nl;	/* used when buffering up comments to remember
				 * that a newline was passed over */
	int     force_nl;	/* when true, code must be broken */
	int     hd_type;	/* used to store type of stmt for if (...),
				 * for (...), etc */
	int     i;		/* local loop counter */
	int     scase;		/* set to true when we see a case, so we will
				 * know what to do with the following colon */
	int     sp_sw;		/* when true, we are in the expressin of
				 * if(...), while(...), etc. */
	int     squest;		/* when this is positive, we have seen a ?
				 * without the matching : in a <c>?<s>:<s>
				 * construct */
	char   *t_ptr;		/* used for copying tokens */
	int     type_code;	/* the type of token, returned by lexi */

	int     last_else = 0;	/* true iff last keyword was an else */


	/*-----------------------------------------------*\
        |		      INITIALIZATION		      |
        \*-----------------------------------------------*/


	hd_type = 0;
	ps.p_stack[0] = stmt;	/* this is the parser's stack */
	ps.last_nl = true;	/* this is true if the last thing scanned was
				 * a newline */
	ps.last_token = semicolon;
	combuf = (char *) malloc(bufsize);
	labbuf = (char *) malloc(bufsize);
	codebuf = (char *) malloc(bufsize);
	tokenbuf = (char *) malloc(bufsize);
	l_com = combuf + bufsize - 5;
	l_lab = labbuf + bufsize - 5;
	l_code = codebuf + bufsize - 5;
	l_token = tokenbuf + bufsize - 5;
	combuf[0] = codebuf[0] = labbuf[0] = ' ';	/* set up code, label,
							 * and comment buffers */
	combuf[1] = codebuf[1] = labbuf[1] = '\0';
	ps.else_if = 1;		/* Default else-if special processing to on */
	s_lab = e_lab = labbuf + 1;
	s_code = e_code = codebuf + 1;
	s_com = e_com = combuf + 1;
	s_token = e_token = tokenbuf + 1;

	in_buffer = (char *) malloc(10);
	in_buffer_limit = in_buffer + 8;
	buf_ptr = buf_end = in_buffer;
	line_no = 1;
	had_eof = ps.in_decl = ps.decl_on_line = break_comma = false;
	sp_sw = force_nl = false;
	ps.in_or_st = false;
	ps.bl_line = true;
	dec_ind = 0;
	di_stack[ps.dec_nest = 0] = 0;
	ps.want_blank = ps.in_stmt = ps.ind_stmt = false;


	scase = ps.pcase = false;
	squest = 0;
	sc_end = 0;
	bp_save = 0;
	be_save = 0;

	output = 0;



	/*--------------------------------------------------*\
        |   		COMMAND LINE SCAN		 |
        \*--------------------------------------------------*/

#ifdef undef
	max_col = 78;		/* -l78 */
	lineup_to_parens = 1;	/* -lp */
	ps.ljust_decl = 0;	/* -ndj */
	ps.com_ind = 33;	/* -c33 */
	star_comment_cont = 1;	/* -sc */
	ps.ind_size = 8;	/* -i8 */
	verbose = 0;
	ps.decl_indent = 16;	/* -di16 */
	ps.indent_parameters = 1;	/* -ip */
	ps.decl_com_ind = 0;	/* if this is not set to some positive value
				 * by an arg, we will set this equal to
				 * ps.com_ind */
	btype_2 = 1;		/* -br */
	cuddle_else = 1;	/* -ce */
	ps.unindent_displace = 0;	/* -d0 */
	ps.case_indent = 0;	/* -cli0 */
	format_col1_comments = 1;	/* -fc1 */
	procnames_start_line = 1;	/* -psl */
	proc_calls_space = 0;	/* -npcs */
	comment_delimiter_on_blankline = 1;	/* -cdb */
	ps.leave_comma = 1;	/* -nbc */
#endif

	for (i = 1; i < argc; ++i)
		if (strcmp(argv[i], "-npro") == 0)
			break;
	set_defaults();
	if (i >= argc)
		set_profile();

	for (i = 1; i < argc; ++i) {

		/*
		 * look thru args (if any) for changes to defaults
		 */
		if (argv[i][0] != '-') {	/* no flag on parameter */
			if (input == 0) {	/* we must have the input file */
				in_name = argv[i];	/* remember name of
							 * input file */
				input = fopen(in_name, "r");
				if (input == 0)	/* check for open error */
					err(1, "%s", in_name);
				continue;
			} else
				if (output == 0) {	/* we have the output
							 * file */
					out_name = argv[i];	/* remember name of
								 * output file */
					if (strcmp(in_name, out_name) == 0) {	/* attempt to overwrite
										 * the file */
						fprintf(stderr, "indent: input and output files must be different\n");
						exit(1);
					}
					output = fopen(out_name, "w");
					if (output == 0)	/* check for create
								 * error */
						err(1, "%s", out_name);
					continue;
				}
			fprintf(stderr, "indent: unknown parameter: %s\n", argv[i]);
			exit(1);
		} else
			set_option(argv[i]);
	}			/* end of for */
	if (input == 0) {
		input = stdin;
	}
	if (output == 0) {
		if (troff || input == stdin)
			output = stdout;
		else {
			out_name = in_name;
			bakcopy();
		}
	}
	if (ps.com_ind <= 1)
		ps.com_ind = 2;	/* dont put normal comments before column 2 */
	if (troff) {
		if (bodyf.font[0] == 0)
			parsefont(&bodyf, "R");
		if (scomf.font[0] == 0)
			parsefont(&scomf, "I");
		if (blkcomf.font[0] == 0)
			blkcomf = scomf, blkcomf.size += 2;
		if (boxcomf.font[0] == 0)
			boxcomf = blkcomf;
		if (stringf.font[0] == 0)
			parsefont(&stringf, "L");
		if (keywordf.font[0] == 0)
			parsefont(&keywordf, "B");
		writefdef(&bodyf, 'B');
		writefdef(&scomf, 'C');
		writefdef(&blkcomf, 'L');
		writefdef(&boxcomf, 'X');
		writefdef(&stringf, 'S');
		writefdef(&keywordf, 'K');
	}
	if (block_comment_max_col <= 0)
		block_comment_max_col = max_col;
	if (ps.decl_com_ind <= 0)	/* if not specified by user, set this */
		ps.decl_com_ind = ps.ljust_decl ? (ps.com_ind <= 10 ? 2 : ps.com_ind - 8) : ps.com_ind;
	if (continuation_indent == 0)
		continuation_indent = ps.ind_size;
	fill_buffer();		/* get first batch of stuff into input buffer */

	parse(semicolon);
	{
		char   *p = buf_ptr;
		int     col = 1;

		while (1) {
			if (*p == ' ')
				col++;
			else
				if (*p == '\t')
					col = ((col - 1) & ~7) + 9;
				else
					break;
			p++;
		}
		if (col > ps.ind_size)
			ps.ind_level = ps.i_l_follow = col / ps.ind_size;
	}
	if (troff) {
		char   *p = in_name, *beg = in_name;

		while (*p)
			if (*p++ == '/')
				beg = p;
		fprintf(output, ".Fn \"%s\"\n", beg);
	}
	/*
         * START OF MAIN LOOP
         */

	while (1) {		/* this is the main loop.  it will go until we
				 * reach eof */
		int     is_procname;

		type_code = lexi();	/* lexi reads one token.  The actual
					 * characters read are stored in
					 * "token". lexi returns a code
					 * indicating the type of token */
		is_procname = ps.procname[0];

		/*
		 * The following code moves everything following an if (), while (),
		 * else, etc. up to the start of the following stmt to a buffer. This
		 * allows proper handling of both kinds of brace placement.
		 */

		flushed_nl = false;
		while (ps.search_brace) {	/* if we scanned an if(),
						 * while(), etc., we might
						 * need to copy stuff into a
						 * buffer we must loop,
						 * copying stuff into
						 * save_com, until we find the
						 * start of the stmt which
						 * follows the if, or whatever */
			switch (type_code) {
			case newline:
				++line_no;
				flushed_nl = true;
			case form_feed:
				break;	/* form feeds and newlines found here
					 * will be ignored */

			case lbrace:	/* this is a brace that starts the
					 * compound stmt */
				if (sc_end == 0) {	/* ignore buffering if a
							 * comment wasnt stored
							 * up */
					ps.search_brace = false;
					goto check_type;
				}
				if (btype_2) {
					save_com[0] = '{';	/* we either want to put
								 * the brace right after
								 * the if */
					goto sw_buffer;	/* go to common code to
							 * get out of this loop */
				}
			case comment:	/* we have a comment, so we must copy
					 * it into the buffer */
				if (!flushed_nl || sc_end != 0) {
					if (sc_end == 0) {	/* if this is the first
								 * comment, we must set
								 * up the buffer */
						save_com[0] = save_com[1] = ' ';
						sc_end = &(save_com[2]);
					} else {
						*sc_end++ = '\n';	/* add newline between
									 * comments */
						*sc_end++ = ' ';
						--line_no;
					}
					*sc_end++ = '/';	/* copy in start of
								 * comment */
					*sc_end++ = '*';

					for (;;) {	/* loop until we get to
							 * the end of the
							 * comment */
						*sc_end = *buf_ptr++;
						if (buf_ptr >= buf_end)
							fill_buffer();

						if (*sc_end++ == '*' && *buf_ptr == '/')
							break;	/* we are at end of
								 * comment */

						if (sc_end >= &(save_com[sc_size])) {	/* check for temp buffer
											 * overflow */
							diag(1, "Internal buffer overflow - Move big comment from right after if, while, or whatever.");
							fflush(output);
							exit(1);
						}
					}
					*sc_end++ = '/';	/* add ending slash */
					if (++buf_ptr >= buf_end)	/* get past / in buffer */
						fill_buffer();
					break;
				}
			default:	/* it is the start of a normal
					 * statment */
				if (flushed_nl)	/* if we flushed a newline,
						 * make sure it is put back */
					force_nl = true;
				if ((type_code == sp_paren && *token == 'i'
					&& last_else && ps.else_if) ||
				    (type_code == sp_nparen && *token == 'e'
					&& e_code != s_code && e_code[-1] == '}'))
					force_nl = false;

				if (sc_end == 0) {	/* ignore buffering if
							 * comment wasnt saved
							 * up */
					ps.search_brace = false;
					goto check_type;
				}
				if (force_nl) {	/* if we should insert a nl
						 * here, put it into the
						 * buffer */
					force_nl = false;
					--line_no;	/* this will be
							 * re-increased when the
							 * nl is read from the
							 * buffer */
					*sc_end++ = '\n';
					*sc_end++ = ' ';
					if (verbose && !flushed_nl)	/* print error msg if
									 * the line was not
									 * already broken */
						diag(0, "Line broken");
					flushed_nl = false;
				}
				for (t_ptr = token; *t_ptr; ++t_ptr)
					*sc_end++ = *t_ptr;	/* copy token into temp
								 * buffer */
				ps.procname[0] = 0;

		sw_buffer:
				ps.search_brace = false;	/* stop looking for
								 * start of stmt */
				bp_save = buf_ptr;	/* save current input
							 * buffer */
				be_save = buf_end;
				buf_ptr = save_com;	/* fix so that
							 * subsequent calls to
							 * lexi will take tokens
							 * out of save_com */
				*sc_end++ = ' ';	/* add trailing blank,
							 * just in case */
				buf_end = sc_end;
				sc_end = 0;
				break;
			}	/* end of switch */
			if (type_code != 0)	/* we must make this check,
						 * just in case there was an
						 * unexpected EOF */
				type_code = lexi();	/* read another token */
			/* if (ps.search_brace) ps.procname[0] = 0; */
			if ((is_procname = ps.procname[0]) && flushed_nl
			    && !procnames_start_line && ps.in_decl
			    && type_code == ident)
				flushed_nl = 0;
		}		/* end of while (search_brace) */
		last_else = 0;
check_type:
		if (type_code == 0) {	/* we got eof */
			if (s_lab != e_lab || s_code != e_code
			    || s_com != e_com)	/* must dump end of line */
				dump_line();
			if (ps.tos > 1)	/* check for balanced braces */
				diag(1, "Stuff missing from end of file.");

			if (verbose) {
				printf("There were %d output lines and %d comments\n",
				    ps.out_lines, ps.out_coms);
				printf("(Lines with comments)/(Lines with code): %6.3f\n",
				    (1.0 * ps.com_lines) / code_lines);
			}
			fflush(output);
			exit(found_err);
		}
		if (
		    (type_code != comment) &&
		    (type_code != newline) &&
		    (type_code != preesc) &&
		    (type_code != form_feed)) {
			if (force_nl &&
			    (type_code != semicolon) &&
			    (type_code != lbrace || !btype_2)) {
				/* we should force a broken line here */
				if (verbose && !flushed_nl)
					diag(0, "Line broken");
				flushed_nl = false;
				dump_line();
				ps.want_blank = false;	/* dont insert blank at
							 * line start */
				force_nl = false;
			}
			ps.in_stmt = true;	/* turn on flag which causes
						 * an extra level of
						 * indentation. this is turned
						 * off by a ; or '}' */
			if (s_com != e_com) {	/* the turkey has embedded a
						 * comment in a line. fix it */
				*e_code++ = ' ';
				for (t_ptr = s_com; *t_ptr; ++t_ptr) {
					CHECK_SIZE_CODE;
					*e_code++ = *t_ptr;
				}
				*e_code++ = ' ';
				*e_code = '\0';	/* null terminate code sect */
				ps.want_blank = false;
				e_com = s_com;
			}
		} else
			if (type_code != comment)	/* preserve force_nl
							 * thru a comment */
				force_nl = false;	/* cancel forced newline
							 * after newline, form
							 * feed, etc */



		/*-----------------------------------------------------*\
		|	   do switch on type of token scanned		|
		\*-----------------------------------------------------*/
		CHECK_SIZE_CODE;
		switch (type_code) {	/* now, decide what to do with the
					 * token */

		case form_feed:/* found a form feed in line */
			ps.use_ff = true;	/* a form feed is treated much
						 * like a newline */
			dump_line();
			ps.want_blank = false;
			break;

		case newline:
			if (ps.last_token != comma || ps.p_l_follow > 0
			    || !ps.leave_comma || ps.block_init || !break_comma || s_com != e_com) {
				dump_line();
				ps.want_blank = false;
			}
			++line_no;	/* keep track of input line number */
			break;

		case lparen:	/* got a '(' or '[' */
			++ps.p_l_follow;	/* count parens to make Healy
						 * happy */
			if (ps.want_blank && *token != '[' &&
			    (ps.last_token != ident || proc_calls_space
				|| (ps.its_a_keyword && (!ps.sizeof_keyword || Bill_Shannon))))
				*e_code++ = ' ';
			if (ps.in_decl && !ps.block_init) {
				if (troff && !ps.dumped_decl_indent && !is_procname && ps.last_token == decl) {
					ps.dumped_decl_indent = 1;
					sprintf(e_code, "\n.Du %dp+\200p \"%s\"\n", dec_ind * 7, token);
					e_code += strlen(e_code);
				} else {
					while ((e_code - s_code) < dec_ind) {
						CHECK_SIZE_CODE;
						*e_code++ = ' ';
					}
					*e_code++ = token[0];
				}
			} else
				*e_code++ = token[0];
			ps.paren_indents[ps.p_l_follow - 1] = e_code - s_code;
			if (sp_sw && ps.p_l_follow == 1 && extra_expression_indent
			    && ps.paren_indents[0] < 2 * ps.ind_size)
				ps.paren_indents[0] = 2 * ps.ind_size;
			ps.want_blank = false;
			if (ps.in_or_st && *token == '(' && ps.tos <= 2) {
				/*
				 * this is a kluge to make sure that declarations will be
				 * aligned right if proc decl has an explicit type on it, i.e.
				 * "int a(x) {..."
				 */
				parse(semicolon);	/* I said this was a
							 * kluge... */
				ps.in_or_st = false;	/* turn off flag for
							 * structure decl or
							 * initialization */
			}
			if (ps.sizeof_keyword)
				ps.sizeof_mask |= 1 << ps.p_l_follow;
			break;

		case rparen:	/* got a ')' or ']' */
			rparen_count--;
			if (ps.cast_mask & (1 << ps.p_l_follow) & ~ps.sizeof_mask) {
				ps.last_u_d = true;
				ps.cast_mask &= (1 << ps.p_l_follow) - 1;
			}
			ps.sizeof_mask &= (1 << ps.p_l_follow) - 1;
			if (--ps.p_l_follow < 0) {
				ps.p_l_follow = 0;
				diag(0, "Extra %c", *token);
			}
			if (e_code == s_code)	/* if the paren starts the
						 * line */
				ps.paren_level = ps.p_l_follow;	/* then indent it */

			*e_code++ = token[0];
			ps.want_blank = true;

			if (sp_sw && (ps.p_l_follow == 0)) {	/* check for end of if
								 * (...), or some such */
				sp_sw = false;
				force_nl = true;	/* must force newline
							 * after if */
				ps.last_u_d = true;	/* inform lexi that a
							 * following operator is
							 * unary */
				ps.in_stmt = false;	/* dont use stmt
							 * continuation
							 * indentation */

				parse(hd_type);	/* let parser worry about if,
						 * or whatever */
			}
			ps.search_brace = btype_2;	/* this should insure
							 * that constructs such
							 * as main(){...} and
							 * int[]{...} have their
							 * braces put in the
							 * right place */
			break;

		case unary_op:	/* this could be any unary operation */
			if (ps.want_blank)
				*e_code++ = ' ';

			if (troff && !ps.dumped_decl_indent && ps.in_decl && !is_procname) {
				sprintf(e_code, "\n.Du %dp+\200p \"%s\"\n", dec_ind * 7, token);
				ps.dumped_decl_indent = 1;
				e_code += strlen(e_code);
			} else {
				char   *res = token;

				if (ps.in_decl && !ps.block_init) {	/* if this is a unary op
									 * in a declaration, we
									 * should indent this
									 * token */
					for (i = 0; token[i]; ++i);	/* find length of token */
					while ((e_code - s_code) < (dec_ind - i)) {
						CHECK_SIZE_CODE;
						*e_code++ = ' ';	/* pad it */
					}
				}
				if (troff && token[0] == '-' && token[1] == '>')
					res = "\\(->";
				for (t_ptr = res; *t_ptr; ++t_ptr) {
					CHECK_SIZE_CODE;
					*e_code++ = *t_ptr;
				}
			}
			ps.want_blank = false;
			break;

		case binary_op:/* any binary operation */
			if (ps.want_blank)
				*e_code++ = ' ';
			{
				char   *res = token;

				if (troff)
					switch (token[0]) {
					case '<':
						if (token[1] == '=')
							res = "\\(<=";
						break;
					case '>':
						if (token[1] == '=')
							res = "\\(>=";
						break;
					case '!':
						if (token[1] == '=')
							res = "\\(!=";
						break;
					case '|':
						if (token[1] == '|')
							res = "\\(br\\(br";
						else
							if (token[1] == 0)
								res = "\\(br";
						break;
					}
				for (t_ptr = res; *t_ptr; ++t_ptr) {
					CHECK_SIZE_CODE;
					*e_code++ = *t_ptr;	/* move the operator */
				}
			}
			ps.want_blank = true;
			break;

		case postop:	/* got a trailing ++ or -- */
			*e_code++ = token[0];
			*e_code++ = token[1];
			ps.want_blank = true;
			break;

		case question:	/* got a ? */
			squest++;	/* this will be used when a later
					 * colon appears so we can distinguish
					 * the <c>?<n>:<n> construct */
			if (ps.want_blank)
				*e_code++ = ' ';
			*e_code++ = '?';
			ps.want_blank = true;
			break;

		case casestmt:	/* got word 'case' or 'default' */
			scase = true;	/* so we can process the later colon
					 * properly */
			goto copy_id;

		case colon:	/* got a ':' */
			if (squest > 0) {	/* it is part of the <c>?<n>:
						 * <n> construct */
				--squest;
				if (ps.want_blank)
					*e_code++ = ' ';
				*e_code++ = ':';
				ps.want_blank = true;
				break;
			}
			if (ps.in_or_st) {
				*e_code++ = ':';
				ps.want_blank = false;
				break;
			}
			ps.in_stmt = false;	/* seeing a label does not
						 * imply we are in a stmt */
			for (t_ptr = s_code; *t_ptr; ++t_ptr)
				*e_lab++ = *t_ptr;	/* turn everything so
							 * far into a label */
			e_code = s_code;
			*e_lab++ = ':';
			*e_lab++ = ' ';
			*e_lab = '\0';

			force_nl = ps.pcase = scase;	/* ps.pcase will be used
							 * by dump_line to
							 * decide how to indent
							 * the label. force_nl
							 * will force a case n:
							 * to be on a line by
							 * itself */
			scase = false;
			ps.want_blank = false;
			break;

		case semicolon:/* got a ';' */
			ps.in_or_st = false;	/* we are not in an
						 * initialization or structure
						 * declaration */
			scase = false;	/* these will only need resetting in a
					 * error */
			squest = 0;
			if (ps.last_token == rparen && rparen_count == 0)
				ps.in_parameter_declaration = 0;
			ps.cast_mask = 0;
			ps.sizeof_mask = 0;
			ps.block_init = 0;
			ps.block_init_level = 0;
			ps.just_saw_decl--;

			if (ps.in_decl && s_code == e_code && !ps.block_init)
				while ((e_code - s_code) < (dec_ind - 1)) {
					CHECK_SIZE_CODE;
					*e_code++ = ' ';
				}

			ps.in_decl = (ps.dec_nest > 0);	/* if we were in a first
							 * level structure
							 * declaration, we arent
							 * any more */

			if ((!sp_sw || hd_type != forstmt) && ps.p_l_follow > 0) {

				/*
				 * This should be true iff there were unbalanced parens in the
				 * stmt.  It is a bit complicated, because the semicolon might
				 * be in a for stmt
				 */
				diag(1, "Unbalanced parens");
				ps.p_l_follow = 0;
				if (sp_sw) {	/* this is a check for a if,
						 * while, etc. with unbalanced
						 * parens */
					sp_sw = false;
					parse(hd_type);	/* dont lose the if, or
							 * whatever */
				}
			}
			*e_code++ = ';';
			ps.want_blank = true;
			ps.in_stmt = (ps.p_l_follow > 0);	/* we are no longer in
								 * the middle of a stmt */

			if (!sp_sw) {	/* if not if for (;;) */
				parse(semicolon);	/* let parser know about
							 * end of stmt */
				force_nl = true;	/* force newline after a
							 * end of stmt */
			}
			break;

		case lbrace:	/* got a '{' */
			ps.in_stmt = false;	/* dont indent the {} */
			if (!ps.block_init)
				force_nl = true;	/* force other stuff on
							 * same line as '{' onto
							 * new line */
			else
				if (ps.block_init_level <= 0)
					ps.block_init_level = 1;
				else
					ps.block_init_level++;

			if (s_code != e_code && !ps.block_init) {
				if (!btype_2) {
					dump_line();
					ps.want_blank = false;
				} else
					if (ps.in_parameter_declaration && !ps.in_or_st) {
						ps.i_l_follow = 0;
						dump_line();
						ps.want_blank = false;
					}
			}
			if (ps.in_parameter_declaration)
				prefix_blankline_requested = 0;

			if (ps.p_l_follow > 0) {	/* check for preceding
							 * unbalanced parens */
				diag(1, "Unbalanced parens");
				ps.p_l_follow = 0;
				if (sp_sw) {	/* check for unclosed if, for,
						 * etc. */
					sp_sw = false;
					parse(hd_type);
					ps.ind_level = ps.i_l_follow;
				}
			}
			if (s_code == e_code)
				ps.ind_stmt = false;	/* dont put extra
							 * indentation on line
							 * with '{' */
			if (ps.in_decl && ps.in_or_st) {	/* this is either a
								 * structure declaration
								 * or an init */
				di_stack[ps.dec_nest++] = dec_ind;
				/* ?		dec_ind = 0; */
			} else {
				ps.decl_on_line = false;	/* we cant be in the
								 * middle of a
								 * declaration, so dont
								 * do special
								 * indentation of
								 * comments */
				if (blanklines_after_declarations_at_proctop
				    && ps.in_parameter_declaration)
					postfix_blankline_requested = 1;
				ps.in_parameter_declaration = 0;
			}
			dec_ind = 0;
			parse(lbrace);	/* let parser know about this */
			if (ps.want_blank)	/* put a blank before '{' if
						 * '{' is not at start of line */
				*e_code++ = ' ';
			ps.want_blank = false;
			*e_code++ = '{';
			ps.just_saw_decl = 0;
			break;

		case rbrace:	/* got a '}' */
			if (ps.p_stack[ps.tos] == decl && !ps.block_init)	/* semicolons can be
										 * omitted in
										 * declarations */
				parse(semicolon);
			if (ps.p_l_follow) {	/* check for unclosed if, for,
						 * else. */
				diag(1, "Unbalanced parens");
				ps.p_l_follow = 0;
				sp_sw = false;
			}
			ps.just_saw_decl = 0;
			ps.block_init_level--;
			if (s_code != e_code && !ps.block_init) {	/* '}' must be first on
									 * line */
				if (verbose)
					diag(0, "Line broken");
				dump_line();
			}
			*e_code++ = '}';
			ps.want_blank = true;
			ps.in_stmt = ps.ind_stmt = false;
			if (ps.dec_nest > 0) {	/* we are in multi-level
						 * structure declaration */
				dec_ind = di_stack[--ps.dec_nest];
				if (ps.dec_nest == 0 && !ps.in_parameter_declaration)
					ps.just_saw_decl = 2;
				ps.in_decl = true;
			}
			prefix_blankline_requested = 0;
			parse(rbrace);	/* let parser know about this */
			ps.search_brace = cuddle_else && ps.p_stack[ps.tos] == ifhead
			    && ps.il[ps.tos] >= ps.ind_level;
			if (ps.tos <= 1 && blanklines_after_procs && ps.dec_nest <= 0)
				postfix_blankline_requested = 1;
			break;

		case swstmt:	/* got keyword "switch" */
			sp_sw = true;
			hd_type = swstmt;	/* keep this for when we have
						 * seen the expression */
			goto copy_id;	/* go move the token into buffer */

		case sp_paren:	/* token is if, while, for */
			sp_sw = true;	/* the interesting stuff is done after
					 * the expression is scanned */
			hd_type = (*token == 'i' ? ifstmt :
			    (*token == 'w' ? whilestmt : forstmt));

			/*
		         * remember the type of header for later use by parser
		         */
			goto copy_id;	/* copy the token into line */

		case sp_nparen:/* got else, do */
			ps.in_stmt = false;
			if (*token == 'e') {
				if (e_code != s_code && (!cuddle_else || e_code[-1] != '}')) {
					if (verbose)
						diag(0, "Line broken");
					dump_line();	/* make sure this starts
							 * a line */
					ps.want_blank = false;
				}
				force_nl = true;	/* also, following stuff
							 * must go onto new line */
				last_else = 1;
				parse(elselit);
			} else {
				if (e_code != s_code) {	/* make sure this starts
							 * a line */
					if (verbose)
						diag(0, "Line broken");
					dump_line();
					ps.want_blank = false;
				}
				force_nl = true;	/* also, following stuff
							 * must go onto new line */
				last_else = 0;
				parse(dolit);
			}
			goto copy_id;	/* move the token into line */

		case decl:	/* we have a declaration type (int, register,
				 * etc.) */
			parse(decl);	/* let parser worry about indentation */
			if (ps.last_token == rparen && ps.tos <= 1) {
				ps.in_parameter_declaration = 1;
				if (s_code != e_code) {
					dump_line();
					ps.want_blank = 0;
				}
			}
			if (ps.in_parameter_declaration && ps.indent_parameters && ps.dec_nest == 0) {
				ps.ind_level = ps.i_l_follow = 1;
				ps.ind_stmt = 0;
			}
			ps.in_or_st = true;	/* this might be a structure
						 * or initialization
						 * declaration */
			ps.in_decl = ps.decl_on_line = true;
			if ( /* !ps.in_or_st && */ ps.dec_nest <= 0)
				ps.just_saw_decl = 2;
			prefix_blankline_requested = 0;
			for (i = 0; token[i++];);	/* get length of token */

			/*
		         * dec_ind = e_code - s_code + (ps.decl_indent>i ? ps.decl_indent
		         * : i);
		         */
			dec_ind = ps.decl_indent > 0 ? ps.decl_indent : i;
			goto copy_id;

		case ident:	/* got an identifier or constant */
			if (ps.in_decl) {	/* if we are in a declaration,
						 * we must indent identifier */
				if (ps.want_blank)
					*e_code++ = ' ';
				ps.want_blank = false;
				if (is_procname == 0 || !procnames_start_line) {
					if (!ps.block_init) {
						if (troff && !ps.dumped_decl_indent) {
							sprintf(e_code, "\n.De %dp+\200p\n", dec_ind * 7);
							ps.dumped_decl_indent = 1;
							e_code += strlen(e_code);
						} else
							while ((e_code - s_code) < dec_ind) {
								CHECK_SIZE_CODE;
								*e_code++ = ' ';
							}
					}
				} else {
					if (dec_ind && s_code != e_code)
						dump_line();
					dec_ind = 0;
					ps.want_blank = false;
				}
			} else
				if (sp_sw && ps.p_l_follow == 0) {
					sp_sw = false;
					force_nl = true;
					ps.last_u_d = true;
					ps.in_stmt = false;
					parse(hd_type);
				}
	copy_id:
			if (ps.want_blank)
				*e_code++ = ' ';
			if (troff && ps.its_a_keyword) {
				e_code = chfont(&bodyf, &keywordf, e_code);
				for (t_ptr = token; *t_ptr; ++t_ptr) {
					CHECK_SIZE_CODE;
					*e_code++ = keywordf.allcaps && islower((unsigned char)*t_ptr)
					    ? toupper(*t_ptr) : *t_ptr;
				}
				e_code = chfont(&keywordf, &bodyf, e_code);
			} else
				for (t_ptr = token; *t_ptr; ++t_ptr) {
					CHECK_SIZE_CODE;
					*e_code++ = *t_ptr;
				}
			ps.want_blank = true;
			break;

		case period:	/* treat a period kind of like a binary
				 * operation */
			*e_code++ = '.';	/* move the period into line */
			ps.want_blank = false;	/* dont put a blank after a
						 * period */
			break;

		case comma:
			ps.want_blank = (s_code != e_code);	/* only put blank after
								 * comma if comma does
								 * not start the line */
			if (ps.in_decl && is_procname == 0 && !ps.block_init)
				while ((e_code - s_code) < (dec_ind - 1)) {
					CHECK_SIZE_CODE;
					*e_code++ = ' ';
				}

			*e_code++ = ',';
			if (ps.p_l_follow == 0) {
				if (ps.block_init_level <= 0)
					ps.block_init = 0;
				if (break_comma && (!ps.leave_comma || compute_code_target() + (e_code - s_code) > max_col - 8))
					force_nl = true;
			}
			break;

		case preesc:	/* got the character '#' */
			if ((s_com != e_com) ||
			    (s_lab != e_lab) ||
			    (s_code != e_code))
				dump_line();
			*e_lab++ = '#';	/* move whole line to 'label' buffer */
			{
				int     in_comment = 0;
				int     com_start = 0;
				char    quote = 0;
				int     com_end = 0;

				while (*buf_ptr == ' ' || *buf_ptr == '\t') {
					buf_ptr++;
					if (buf_ptr >= buf_end)
						fill_buffer();
				}
				while (*buf_ptr != '\n' || in_comment) {
					CHECK_SIZE_LAB;
					*e_lab = *buf_ptr++;
					if (buf_ptr >= buf_end)
						fill_buffer();
					switch (*e_lab++) {
					case BACKSLASH:
						if (troff)
							*e_lab++ = BACKSLASH;
						if (!in_comment) {
							*e_lab++ = *buf_ptr++;
							if (buf_ptr >= buf_end)
								fill_buffer();
						}
						break;
					case '/':
						if (*buf_ptr == '*' && !in_comment && !quote) {
							in_comment = 1;
							*e_lab++ = *buf_ptr++;
							com_start = e_lab - s_lab - 2;
						}
						break;
					case '"':
						if (quote == '"')
							quote = 0;
						break;
					case '\'':
						if (quote == '\'')
							quote = 0;
						break;
					case '*':
						if (*buf_ptr == '/' && in_comment) {
							in_comment = 0;
							*e_lab++ = *buf_ptr++;
							com_end = e_lab - s_lab;
						}
						break;
					}
				}

				while (e_lab > s_lab && (e_lab[-1] == ' ' || e_lab[-1] == '\t'))
					e_lab--;
				if (e_lab - s_lab == com_end && bp_save == 0) {	/* comment on
										 * preprocessor line */
					if (sc_end == 0)	/* if this is the first
								 * comment, we must set
								 * up the buffer */
						sc_end = &(save_com[0]);
					else {
						*sc_end++ = '\n';	/* add newline between
									 * comments */
						*sc_end++ = ' ';
						--line_no;
					}
					memmove(sc_end, s_lab + com_start, com_end - com_start);
					sc_end += com_end - com_start;
					if (sc_end >= &save_com[sc_size])
						abort();
					e_lab = s_lab + com_start;
					while (e_lab > s_lab && (e_lab[-1] == ' ' || e_lab[-1] == '\t'))
						e_lab--;
					bp_save = buf_ptr;	/* save current input
								 * buffer */
					be_save = buf_end;
					buf_ptr = save_com;	/* fix so that
								 * subsequent calls to
								 * lexi will take tokens
								 * out of save_com */
					*sc_end++ = ' ';	/* add trailing blank,
								 * just in case */
					buf_end = sc_end;
					sc_end = 0;
				}
				*e_lab = '\0';	/* null terminate line */
				ps.pcase = false;
			}

			if (strncmp(s_lab, "#if", 3) == 0) {
				if (blanklines_around_conditional_compilation) {
					int     c;
					prefix_blankline_requested++;
					while ((c = getc(input)) == '\n');
					ungetc(c, input);
				}
				if (ifdef_level < sizeof state_stack / sizeof state_stack[0]) {
					match_state[ifdef_level].tos = -1;
					state_stack[ifdef_level++] = ps;
				} else
					diag(1, "#if stack overflow");
			} else
				if (strncmp(s_lab, "#else", 5) == 0) {
					if (ifdef_level <= 0)
						diag(1, "Unmatched #else");
					else {
						match_state[ifdef_level - 1] = ps;
						ps = state_stack[ifdef_level - 1];
					}
				} else
					if (strncmp(s_lab, "#endif", 6) == 0) {
						if (ifdef_level <= 0)
							diag(1, "Unmatched #endif");
						else {
							ifdef_level--;

#ifdef undef
							/*
						         * This match needs to be more intelligent before the
						         * message is useful
						         */
							if (match_state[ifdef_level].tos >= 0
							    && memcmp(&ps, &match_state[ifdef_level], sizeof ps))
								diag(0, "Syntactically inconsistant #ifdef alternatives.");
#endif
						}
						if (blanklines_around_conditional_compilation) {
							postfix_blankline_requested++;
							n_real_blanklines = 0;
						}
					}
			break;	/* subsequent processing of the newline
				 * character will cause the line to be printed */

		case comment:	/* we have gotten a start comment */
			/* this is a biggie */
			if (flushed_nl) {	/* we should force a broken
						 * line here */
				flushed_nl = false;
				dump_line();
				ps.want_blank = false;	/* dont insert blank at
							 * line start */
				force_nl = false;
			}
			pr_comment();
			break;
		}		/* end of big switch stmt */

		*e_code = '\0';	/* make sure code section is null terminated */
		if (type_code != comment && type_code != newline && type_code != preesc)
			ps.last_token = type_code;
	}			/* end of main while (1) loop */
}
/*
 * copy input file to backup file if in_name is /blah/blah/blah/file, then
 * backup file will be ".Bfile" then make the backup file the input and
 * original input file the output
 */
void
bakcopy()
{
	int     n, bakchn;
	char    buff[8 * 1024];
	char   *p;

	/* construct file name .Bfile */
	for (p = in_name; *p; p++);	/* skip to end of string */
	while (p > in_name && *p != '/')	/* find last '/' */
		p--;
	if (*p == '/')
		p++;
	sprintf(bakfile, "%s.BAK", p);

	/* copy in_name to backup file */
	bakchn = creat(bakfile, 0600);
	if (bakchn < 0)
		err(1, "%s", bakfile);
	while ((n = read(fileno(input), buff, sizeof buff)) > 0)
		if (write(bakchn, buff, n) != n)
			err(1, "%s", bakfile);
	if (n < 0)
		err(1, "%s", in_name);
	close(bakchn);
	fclose(input);

	/* re-open backup file as the input file */
	input = fopen(bakfile, "r");
	if (input == 0)
		err(1, "%s", bakfile);
	/* now the original input file will be the output */
	output = fopen(in_name, "w");
	if (output == 0) {
		unlink(bakfile);
		err(1, "%s", in_name);
	}
}