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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: ctags.c,v 1.12 2009/10/27 23:59:37 deraadt Exp $	*/
/*	$NetBSD: ctags.c,v 1.4 1995/09/02 05:57:23 jtc Exp $	*/

/*
 * Copyright (c) 1987, 1993, 1994, 1995
 *	The Regents of the University of California.  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 <limits.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>

#include "ctags.h"

/*
 * ctags: create a tags file
 */

NODE	*head;			/* head of the sorted binary tree */

				/* boolean "func" (see init()) */
bool	_wht[256], _etk[256], _itk[256], _btk[256], _gd[256];

FILE	*inf;			/* ioptr for current input file */
FILE	*outf;			/* ioptr for tags file */

long	lineftell;		/* ftell after getc( inf ) == '\n' */

int	lineno;			/* line number of current line */
int	dflag;			/* -d: non-macro defines */
int	tflag;			/* -t: create tags for typedefs */
int	vflag;			/* -v: vgrind style index output */
int	wflag;			/* -w: suppress warnings */
int	xflag;			/* -x: cxref style output */

char	*curfile;		/* current input file name */
char	searchar = '/';		/* use /.../ searches by default */
char	lbuf[LINE_MAX];

void	init(void);
void	find_entries(char *);

int
main(int argc, char *argv[])
{
	static char	*outfile = "tags";	/* output file */
	int	aflag;				/* -a: append to tags */
	int	uflag;				/* -u: update tags */
	int	exit_val;			/* exit value */
	int	step;				/* step through args */
	int	ch;				/* getopts char */
	char	*cmd;

	aflag = uflag = NO;
	while ((ch = getopt(argc, argv, "BFadf:tuwvx")) != -1)
		switch(ch) {
		case 'B':
			searchar = '?';
			break;
		case 'F':
			searchar = '/';
			break;
		case 'a':
			aflag++;
			break;
		case 'd':
			dflag++;
			break;
		case 'f':
			outfile = optarg;
			break;
		case 't':
			tflag++;
			break;
		case 'u':
			uflag++;
			break;
		case 'w':
			wflag++;
			break;
		case 'v':
			vflag++;
		case 'x':
			xflag++;
			break;
		case '?':
		default:
			goto usage;
		}
	argv += optind;
	argc -= optind;
	if (!argc) {
usage:		(void)fprintf(stderr,
			"usage: ctags [-aBdFtuvwx] [-f tagsfile] file ...\n");
		exit(1);
	}

	init();

	for (exit_val = step = 0; step < argc; ++step)
		if (!(inf = fopen(argv[step], "r"))) {
			warn("%s", argv[step]);
			exit_val = 1;
		}
		else {
			curfile = argv[step];
			find_entries(argv[step]);
			(void)fclose(inf);
		}

	if (head) {
		if (xflag)
			put_entries(head);
		else {
			if (uflag) {
				for (step = 0; step < argc; step++) {
					if (asprintf(&cmd,
					    "mv %s OTAGS; fgrep -v '\t%s\t' OTAGS >%s; rm OTAGS",
					    outfile, argv[step], outfile) == -1)
						err(1, "out of space");
					system(cmd);
					free(cmd);
					cmd = NULL;
				}
				++aflag;
			}
			if (!(outf = fopen(outfile, aflag ? "a" : "w")))
				err(exit_val, "%s", outfile);
			put_entries(head);
			(void)fclose(outf);
			if (uflag) {
				if (asprintf(&cmd, "sort -o %s %s",
				    outfile, outfile) == -1)
						err(1, "out of space");
				system(cmd);
				free(cmd);
				cmd = NULL;
			}
		}
	}
	exit(exit_val);
}

/*
 * init --
 *	this routine sets up the boolean psuedo-functions which work by
 *	setting boolean flags dependent upon the corresponding character.
 *	Every char which is NOT in that string is false with respect to
 *	the pseudo-function.  Therefore, all of the array "_wht" is NO
 *	by default and then the elements subscripted by the chars in
 *	CWHITE are set to YES.  Thus, "_wht" of a char is YES if it is in
 *	the string CWHITE, else NO.
 */
void
init(void)
{
	int		i;
	unsigned char	*sp;

	for (i = 0; i < 256; i++) {
		_wht[i] = _etk[i] = _itk[i] = _btk[i] = NO;
		_gd[i] = YES;
	}
#define	CWHITE	" \f\t\n"
	for (sp = CWHITE; *sp; sp++)	/* white space chars */
		_wht[*sp] = YES;
#define	CTOKEN	" \t\n\"'#()[]{}=-+%*/&|^~!<>;,.:?"
	for (sp = CTOKEN; *sp; sp++)	/* token ending chars */
		_etk[*sp] = YES;
#define	CINTOK	"ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz0123456789"
	for (sp = CINTOK; *sp; sp++)	/* valid in-token chars */
		_itk[*sp] = YES;
#define	CBEGIN	"ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz"
	for (sp = CBEGIN; *sp; sp++)	/* token starting chars */
		_btk[*sp] = YES;
#define	CNOTGD	",;"
	for (sp = CNOTGD; *sp; sp++)	/* invalid after-function chars */
		_gd[*sp] = NO;
}

/*
 * find_entries --
 *	this routine opens the specified file and calls the function
 *	which searches the file.
 */
void
find_entries(char *file)
{
	char	*cp;

	lineno = 0;				/* should be 1 ?? KB */
	if ((cp = strrchr(file, '.'))) {
		if (cp[1] == 'l' && !cp[2]) {
			int	c;

			for (;;) {
				if (GETC(==, EOF))
					return;
				if (!iswhite(c)) {
					rewind(inf);
					break;
				}
			}
#define	LISPCHR	";(["
/* lisp */		if (strchr(LISPCHR, c)) {
				l_entries();
				return;
			}
/* lex */		else {
				/*
				 * we search all 3 parts of a lex file
				 * for C references.  This may be wrong.
				 */
				toss_yysec();
				(void)strlcpy(lbuf, "%%$", sizeof lbuf);
				pfnote("yylex", lineno);
				rewind(inf);
			}
		}
/* yacc */	else if (cp[1] == 'y' && !cp[2]) {
			/*
			 * we search only the 3rd part of a yacc file
			 * for C references.  This may be wrong.
			 */
			toss_yysec();
			(void)strlcpy(lbuf, "%%$", sizeof lbuf);
			pfnote("yyparse", lineno);
			y_entries();
		}
/* fortran */	else if ((cp[1] != 'c' && cp[1] != 'h') && !cp[2]) {
			if (PF_funcs())
				return;
			rewind(inf);
		}
	}
/* C */	c_entries();
}