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Subject: ctags source
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Date: 30 Nov 85 18:21:54 GMT
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Mod.sources:  Volume 3, Issue 53
Submitted by: ucbvax!ucsf-cgl.ARPA!arnold (Ken Arnold)


#!/bin/sh
#
# I have received enough requests for the current source to ctags to
# post it.  Here is the latest version (what will go out with 4.3,
# modulo any bugs fixed during the beta period).  It is the 4.2 ctags
# with recognition of yacc and lex tags added.  Files ending in .y are
# presumed to be yacc files, .l files are either lisp or lex files,
# depending upon the first non-blank character (yeah, it's a hack, but
# it works).  Man page is included.  Note that I wrote the original
# ctags (recognized only C), and added the YACC and lex after others
# wrote the recognizers for FORTRAN, PASCAL, and lisp, so this code is
# rather a mix of styles, for which I take no responsibility.  So, here
# come those famous words:
#
# This is a shell archive, meaning:
# 1. Remove everything above the #!/bin/sh line.
# 2. Save the resulting text in a file.
# 3. Execute the file with /bin/sh (not csh) to create the files:
#	ctags.1
#	ctags.c
# This archive created: Mon Nov 25 12:53:49 1985
export PATH; PATH=/bin:$PATH
if test -f 'ctags.1'
then
	echo shar: over-writing existing file "'ctags.1'"
fi
cat << \SHAR_EOF > 'ctags.1'
.TH CTAGS 1 "25 August 1982"
.UC 4
.SH NAME
ctags \- create a tags file
.SH SYNOPSIS
.B ctags
[ 
.B \-BFatuwvx
]
name ...
.SH DESCRIPTION
.I Ctags
makes a tags file for
.IR ex (1)
from the specified C, Pascal, Fortran, YACC, lex, and lisp sources.
A tags file gives the locations of specified objects (in this case
functions and typedefs) in a group of files.  Each line of the tags
file contains the object name, the file in which it is defined, and
an address specification for the object definition. Functions are
searched with a pattern, typedefs with a line number. Specifiers are
given in separate fields on the line, separated by blanks or tabs.
Using the
.I tags
file,
.I ex
can quickly find these objects definitions.
.PP
If the
.B \-x
flag is given, 
.I ctags
produces a list of object names, the line number and file
name on which each is defined, as well as the text of that line
and prints this on the standard output.  This is a simple index
which can be printed out as an off-line readable function index.
.PP
If the
.B \-v
flag is given,
an index of the form expected by
.IR vgrind (1)
is produced on the standard output.
This listing contains the function name,
file name, and page number
(assuming 64 line pages).
Since the output will be sorted into lexicographic order,
it may be desired to run the output through
.BR "sort \-f" .
Sample use:
.nf
	ctags \-v files | sort \-f > index
	vgrind \-x index
.fi
.PP
Files whose names end in 
.B \.c
or
.B \.h
are assumed to be C source files and are searched for C routine and
macro definitions.
Files whose names end in
.B \.y
are assumed to be YACC source files.
Files whose names end in
.B \.l
are assumed to be either lisp files
if their first non-blank character is `;', `(', or `[',
or lex files otherwise.
Other files are first examined to see if they contain any Pascal or
Fortran routine definitions; if not, they are processed again
looking for C definitions.
.PP
Other options are:
.TP 5
.B \-F
use forward searching patterns (/.../) (default).
.TP 5
.B \-B
use backward searching patterns (?...?).
.TP 5
.B \-a
append to tags file.
.TP 5
.B \-t
create tags for typedefs.
.TP 5
.B \-w
suppressing warning diagnostics.
.TP 5
.B \-u
causing the specified files to be
.I updated
in tags, that is, all references to them are deleted,
and the new values are appended to the file.
(Beware: this option is implemented in a way which is rather slow;
it is usually faster to simply rebuild the
.I tags
file.)
.PP
The tag
.I main
is treated specially in C programs.
The tag formed is created by prepending
.I M
to the name of the file, with a trailing .c removed, if
any, and leading pathname components also removed.
This makes use of
.I ctags
practical in directories with more than one program.
.SH FILES
.DT
tags		output tags file
.SH SEE ALSO
ex(1), vi(1)
.SH AUTHOR
Ken Arnold; FORTRAN added by Jim Kleckner; Bill Joy
added Pascal and
.B \-x,
replacing
.I cxref;
C typedefs added by Ed Pelegri-Llopart.
.SH BUGS
Recognition of \fBfunctions\fR, \fBsubroutines\fR and \fBprocedures\fR
for FORTRAN and Pascal is done is a very simpleminded way.
No attempt is made to deal with block structure; if you have two
Pascal procedures in different blocks with the same name you lose.
.PP
The method of deciding whether to look for C or Pascal and FORTRAN
functions is a hack.
.PP
Does not know about #ifdefs.
.PP
Should know about Pascal types.
Relies on the input being well formed to detect typedefs.
Use of -tx shows only the last line of typedefs.
SHAR_EOF
if test -f 'ctags.c'
then
	echo shar: over-writing existing file "'ctags.c'"
fi
cat << \SHAR_EOF > 'ctags.c'
/* $Header */

static char *sccsid = "@(#)ctags.c	4.7 (Berkeley) 8/18/83";

#include <stdio.h>
#include <ctype.h>

/*
 * ctags: create a tags file
 */

#define	reg	register
#define	bool	char

#define	TRUE	(1)
#define	FALSE	(0)

#define	iswhite(arg)	(_wht[arg])	/* T if char is white		*/
#define	begtoken(arg)	(_btk[arg])	/* T if char can start token	*/
#define	intoken(arg)	(_itk[arg])	/* T if char can be in token	*/
#define	endtoken(arg)	(_etk[arg])	/* T if char ends tokens	*/
#define	isgood(arg)	(_gd[arg])	/* T if char can be after ')'	*/

#define	max(I1,I2)	(I1 > I2 ? I1 : I2)

struct	nd_st {			/* sorting structure			*/
	char	*entry;			/* function or type name	*/
	char	*file;			/* file name			*/
	bool	f;			/* use pattern or line no	*/
	int	lno;			/* for -x option		*/
	char	*pat;			/* search pattern		*/
	bool	been_warned;		/* set if noticed dup		*/
	struct	nd_st	*left,*right;	/* left and right sons		*/
};

long	ftell();
typedef	struct	nd_st	NODE;

bool	number,				/* T if on line starting with #	*/
	term	= FALSE,		/* T if print on terminal	*/
	makefile= TRUE,			/* T if to creat "tags" file	*/
	gotone,				/* found a func already on line	*/
					/* boolean "func" (see init)	*/
	_wht[0177],_etk[0177],_itk[0177],_btk[0177],_gd[0177];

	/* typedefs are recognized using a simple finite automata,
	 * tydef is its state variable.
	 */
typedef enum {none, begin, middle, end } TYST;

TYST tydef = none;

char	searchar = '/';			/* use /.../ searches 		*/

int	lineno;				/* line number of current line */
char	line[4*BUFSIZ],		/* current input line			*/
	*curfile,		/* current input file name		*/
	*outfile= "tags",	/* output file				*/
	*white	= " \f\t\n",	/* white chars				*/
	*endtk	= " \t\n\"'#()[]{}=-+%*/&|^~!<>;,.:?",
				/* token ending chars			*/
	*begtk	= "ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz",
				/* token starting chars			*/
	*intk	= "ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz0123456789",
				/* valid in-token chars			*/
	*notgd	= ",;";		/* non-valid after-function chars	*/

int	file_num;		/* current file number			*/
int	aflag;			/* -a: append to tags */
int	tflag;			/* -t: create tags for typedefs */
int	uflag;			/* -u: update tags */
int	wflag;			/* -w: suppress warnings */
int	vflag;			/* -v: create vgrind style index output */
int	xflag;			/* -x: create cxref style output */

char	lbuf[BUFSIZ];

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

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

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

char	*savestr();
char	*rindex(), *index();
char	*toss_comment();

main(ac,av)
int	ac;
char	*av[];
{
	char cmd[100];
	int i;

	while (ac > 1 && av[1][0] == '-') {
		for (i=1; av[1][i]; i++) {
			switch(av[1][i]) {
			  case 'B':
				searchar='?';
				break;
			  case 'F':
				searchar='/';
				break;
			  case 'a':
				aflag++;
				break;
			  case 't':
				tflag++;
				break;
			  case 'u':
				uflag++;
				break;
			  case 'w':
				wflag++;
				break;
			  case 'v':
				vflag++;
				xflag++;
				break;
			  case 'x':
				xflag++;
				break;
			  default:
				goto usage;
		}
		}
		ac--; av++;
	}

	if (ac <= 1) {
usage:
		printf("Usage: ctags [-BFatuwvx] file ...\n");
		exit(1);
	}

	init();			/* set up boolean "functions"		*/
	/*
	 * loop through files finding functions
	 */
	for (file_num = 1; file_num < ac; file_num++)
		find_entries(av[file_num]);

	if (xflag) {
		put_entries(head);
		exit(0);
	}
	if (uflag) {
		for (i=1; i<ac; i++) {
			sprintf(cmd,
				"mv %s OTAGS;fgrep -v '\t%s\t' OTAGS >%s;rm OTAGS",
				outfile, av[i], outfile);
			system(cmd);
		}
		aflag++;
	}
	outf = fopen(outfile, aflag ? "a" : "w");
	if (outf == NULL) {
		perror(outfile);
		exit(1);
	}
	put_entries(head);
	fclose(outf);
	if (uflag) {
		sprintf(cmd, "sort %s -o %s", outfile, outfile);
		system(cmd);
	}
	exit(0);
}

/*
 * This routine sets up the boolean psuedo-functions which work
 * by seting boolean flags dependent upon the corresponding character
 * Every char which is NOT in that string is not a white char.  Therefore,
 * all of the array "_wht" is set to FALSE, and then the elements
 * subscripted by the chars in "white" are set to TRUE.  Thus "_wht"
 * of a char is TRUE if it is the string "white", else FALSE.
 */
init()
{

	reg	char	*sp;
	reg	int	i;

	for (i = 0; i < 0177; i++) {
		_wht[i] = _etk[i] = _itk[i] = _btk[i] = FALSE;
		_gd[i] = TRUE;
	}
	for (sp = white; *sp; sp++)
		_wht[*sp] = TRUE;
	for (sp = endtk; *sp; sp++)
		_etk[*sp] = TRUE;
	for (sp = intk; *sp; sp++)
		_itk[*sp] = TRUE;
	for (sp = begtk; *sp; sp++)
		_btk[*sp] = TRUE;
	for (sp = notgd; *sp; sp++)
		_gd[*sp] = FALSE;
}

/*
 * This routine opens the specified file and calls the function
 * which finds the function and type definitions.
 */
find_entries(file)
char	*file;
{
	char *cp;

	if ((inf = fopen(file,"r")) == NULL) {
		perror(file);
		return;
	}
	curfile = savestr(file);
	lineno = 0;
	cp = rindex(file, '.');
	/* .l implies lisp or lex source code */
	if (cp && cp[1] == 'l' && cp[2] == '\0') {
		if (index(";([", first_char()) != NULL) {	/* lisp */
			L_funcs(inf);
			fclose(inf);
			return;
		}
		else {						/* lex */
			/*
			 * throw away all the code before the second "%%"
			 */
			toss_yysec();
			getline();
			pfnote("yylex", lineno, TRUE);
			toss_yysec();
			C_entries();
			fclose(inf);
			return;
		}
	}
	/* .y implies a yacc file */
	if (cp && cp[1] == 'y' && cp[2] == '\0') {
		toss_yysec();
		Y_entries();
		C_entries();
		fclose(inf);
		return;
	}
	/* if not a .c or .h file, try fortran */
	if (cp && (cp[1] != 'c' && cp[1] != 'h') && cp[2] == '\0') {
		if (PF_funcs(inf) != 0) {
			fclose(inf);
			return;
		}
		rewind(inf);	/* no fortran tags found, try C */
	}
	C_entries();
	fclose(inf);
}

pfnote(name, ln, f)
char	*name;
int	ln;
bool	f;		/* f == TRUE when function */
{
	register char *fp;
	register NODE *np;
	char nbuf[BUFSIZ];

	if ((np = (NODE *) malloc(sizeof (NODE))) == NULL) {
		fprintf(stderr, "ctags: too many entries to sort\n");
		put_entries(head);
		free_tree(head);
		head = np = (NODE *) malloc(sizeof (NODE));
	}
	if (xflag == 0 && !strcmp(name, "main")) {
		fp = rindex(curfile, '/');
		if (fp == 0)
			fp = curfile;
		else
			fp++;
		sprintf(nbuf, "M%s", fp);
		fp = rindex(nbuf, '.');
		if (fp && fp[2] == 0)
			*fp = 0;
		name = nbuf;
	}
	np->entry = savestr(name);
	np->file = curfile;
	np->f = f;
	np->lno = ln;
	np->left = np->right = 0;
	if (xflag == 0) {
		lbuf[50] = 0;
		strcat(lbuf, "$");
		lbuf[50] = 0;
	}
	np->pat = savestr(lbuf);
	if (head == NULL)
		head = np;
	else
		add_node(np, head);
}

/*
 * This routine finds functions and typedefs in C syntax and adds them
 * to the list.
 */
C_entries()
{
	register int c;
	register char *token, *tp;
	bool incomm, inquote, inchar, midtoken;
	int level;
	char *sp;
	char tok[BUFSIZ];

	number = gotone = midtoken = inquote = inchar = incomm = FALSE;
	level = 0;
	sp = tp = token = line;
	lineno++;
	lineftell = ftell(inf);
	for (;;) {
		*sp = c = getc(inf);
		if (feof(inf))
			break;
		if (c == '\n')
			lineno++;
		else if (c == '\\') {
			c = *++sp = getc(inf);
			if (c == '\n')
				c = ' ';
		}
		else if (incomm) {
			if (c == '*') {
				while ((*++sp=c=getc(inf)) == '*')
					continue;
				if (c == '\n')
					lineno++;
				if (c == '/')
					incomm = FALSE;
			}
		}
		else if (inquote) {
			/*
			 * Too dumb to know about \" not being magic, but
			 * they usually occur in pairs anyway.
			 */
			if (c == '"')
				inquote = FALSE;
			continue;
		}
		else if (inchar) {
			if (c == '\'')
				inchar = FALSE;
			continue;
		}
		else switch (c) {
		  case '"':
			inquote = TRUE;
			continue;
		  case '\'':
			inchar = TRUE;
			continue;
		  case '/':
			if ((*++sp=c=getc(inf)) == '*')
				incomm = TRUE;
			else
				ungetc(*sp, inf);
			continue;
		  case '#':
			if (sp == line)
				number = TRUE;
			continue;
		  case '{':
			if (tydef == begin) {
				tydef=middle;
			}
			level++;
			continue;
		  case '}':
			if (sp == line)
				level = 0;	/* reset */
			else
				level--;
			if (!level && tydef==middle) {
				tydef=end;
			}
			continue;
		}
		if (!level && !inquote && !incomm && gotone == FALSE) {
			if (midtoken) {
				if (endtoken(c)) {
					int f;
					int pfline = lineno;
					if (start_entry(&sp,token,tp,&f)) {
						strncpy(tok,token,tp-token+1);
						tok[tp-token+1] = 0;
						getline();
						pfnote(tok, pfline, f);
						gotone = f;	/* function */
					}
					midtoken = FALSE;
					token = sp;
				}
				else if (intoken(c))
					tp++;
			}
			else if (begtoken(c)) {
				token = tp = sp;
				midtoken = TRUE;
			}
		}
		if (c == ';'  &&  tydef==end)	/* clean with typedefs */
			tydef=none;
		sp++;
		if (c == '\n' || sp > &line[sizeof (line) - BUFSIZ]) {
			tp = token = sp = line;
			lineftell = ftell(inf);
			number = gotone = midtoken = inquote = inchar = FALSE;
		}
	}
}

/*
 * This routine  checks to see if the current token is
 * at the start of a function, or corresponds to a typedef
 * It updates the input line * so that the '(' will be
 * in it when it returns.
 */
start_entry(lp,token,tp,f)
char	**lp,*token,*tp;
int	*f;
{
	reg	char	c,*sp,*tsp;
	static	bool	found;
	bool	firsttok;		/* T if have seen first token in ()'s */
	int	bad;

	*f = 1;			/* a function */
	sp = *lp;
	c = *sp;
	bad = FALSE;
	if (!number) {		/* space is not allowed in macro defs	*/
		while (iswhite(c)) {
			*++sp = c = getc(inf);
			if (c == '\n') {
				lineno++;
				if (sp > &line[sizeof (line) - BUFSIZ])
					goto ret;
			}
		}
	/* the following tries to make it so that a #define a b(c)	*/
	/* doesn't count as a define of b.				*/
	}
	else {
		if (!strncmp(token, "define", 6))
			found = 0;
		else
			found++;
		if (found >= 2) {
			gotone = TRUE;
badone:			bad = TRUE;
			goto ret;
		}
	}
	/* check for the typedef cases		*/
	if (tflag && !strncmp(token, "typedef", 7)) {
		tydef=begin;
		goto badone;
	}
	if (tydef==begin && (!strncmp(token, "struct", 6) ||
	    !strncmp(token, "union", 5) || !strncmp(token, "enum", 4))) {
		goto badone;
	}
	if (tydef==begin) {
		tydef=end;
		goto badone;
	}
	if (tydef==end) {
		*f = 0;
		goto ret;
	}
	if (c != '(')
		goto badone;
	firsttok = FALSE;
	while ((*++sp=c=getc(inf)) != ')') {
		if (c == '\n') {
			lineno++;
			if (sp > &line[sizeof (line) - BUFSIZ])
				goto ret;
		}
		/*
		 * This line used to confuse ctags:
		 *	int	(*oldhup)();
		 * This fixes it. A nonwhite char before the first
		 * token, other than a / (in case of a comment in there)
		 * makes this not a declaration.
		 */
		if (begtoken(c) || c=='/')
			firsttok++;
		else if (!iswhite(c) && !firsttok)
			goto badone;
	}
	while (iswhite(*++sp=c=getc(inf)))
		if (c == '\n') {
			lineno++;
			if (sp > &line[sizeof (line) - BUFSIZ])
				break;
		}
ret:
	*lp = --sp;
	if (c == '\n')
		lineno--;
	ungetc(c,inf);
	return !bad && (!*f || isgood(c));
					/* hack for typedefs */
}

/*
 * Y_entries:
 *	Find the yacc tags and put them in.
 */
Y_entries()
{
	register char	*sp, *orig_sp;
	register int	brace;
	register bool	in_rule, toklen;
	char		tok[BUFSIZ];

	brace = 0;
	getline();
	pfnote("yyparse", lineno, TRUE);
	while (fgets(line, sizeof line, inf) != NULL)
		for (sp = line; *sp; sp++)
			switch (*sp) {
			  case '\n':
				lineno++;
				/* FALLTHROUGH */
			  case ' ':
			  case '\t':
			  case '\f':
			  case '\r':
				break;
			  case '"':
				do {
					while (*++sp != '"')
						continue;
				} while (sp[-1] == '\\');
				break;
			  case '\'':
				do {
					while (*++sp != '\'')
						continue;
				} while (sp[-1] == '\\');
				break;
			  case '/':
				if (*++sp == '*')
					sp = toss_comment(sp);
				else
					--sp;
				break;
			  case '{':
				brace++;
				break;
			  case '}':
				brace--;
				break;
			  case '%':
				if (sp[1] == '%' && sp == line)
					return;
				break;
			  case '|':
			  case ';':
				in_rule = FALSE;
				break;
			  default:
				if (brace == 0  && !in_rule && (isalpha(*sp) ||
								*sp == '.' ||
								*sp == '_')) {
					orig_sp = sp;
					++sp;
					while (isalnum(*sp) || *sp == '_' ||
					       *sp == '.')
						sp++;
					toklen = sp - orig_sp;
					while (isspace(*sp))
						sp++;
					if (*sp == ':' || (*sp == '\0' &&
							   first_char() == ':'))
					{
						strncpy(tok, orig_sp, toklen);
						tok[toklen] = '\0';
						strcpy(lbuf, line);
						lbuf[strlen(lbuf) - 1] = '\0';
						pfnote(tok, lineno, TRUE);
						in_rule = TRUE;
					}
					else
						sp--;
				}
				break;
			}
}

char *
toss_comment(start)
char	*start;
{
	register char	*sp;

	/*
	 * first, see if the end-of-comment is on the same line
	 */
	do {
		while ((sp = index(start, '*')) != NULL)
			if (sp[1] == '/')
				return ++sp;
			else
				start = ++sp;
		start = line;
		lineno++;
	} while (fgets(line, sizeof line, inf) != NULL);
}

getline()
{
	long saveftell = ftell( inf );
	register char *cp;

	fseek( inf , lineftell , 0 );
	fgets(lbuf, sizeof lbuf, inf);
	cp = rindex(lbuf, '\n');
	if (cp)
		*cp = 0;
	fseek(inf, saveftell, 0);
}

free_tree(node)
NODE	*node;
{

	while (node) {
		free_tree(node->right);
		cfree(node);
		node = node->left;
	}
}

add_node(node, cur_node)
	NODE *node,*cur_node;
{
	register int dif;

	dif = strcmp(node->entry, cur_node->entry);
	if (dif == 0) {
		if (node->file == cur_node->file) {
			if (!wflag) {
fprintf(stderr,"Duplicate entry in file %s, line %d: %s\n",
    node->file,lineno,node->entry);
fprintf(stderr,"Second entry ignored\n");
			}
			return;
		}
		if (!cur_node->been_warned)
			if (!wflag)
fprintf(stderr,"Duplicate entry in files %s and %s: %s (Warning only)\n",
    node->file, cur_node->file, node->entry);
		cur_node->been_warned = TRUE;
		return;
	}

	if (dif < 0) {
		if (cur_node->left != NULL)
			add_node(node,cur_node->left);
		else
			cur_node->left = node;
		return;
	}
	if (cur_node->right != NULL)
		add_node(node,cur_node->right);
	else
		cur_node->right = node;
}

put_entries(node)
reg NODE	*node;
{
	reg char	*sp;

	if (node == NULL)
		return;
	put_entries(node->left);
	if (xflag == 0)
		if (node->f) {		/* a function */
			fprintf(outf, "%s\t%s\t%c^",
				node->entry, node->file, searchar);
			for (sp = node->pat; *sp; sp++)
				if (*sp == '\\')
					fprintf(outf, "\\\\");
				else if (*sp == searchar)
					fprintf(outf, "\\%c", searchar);
				else
					putc(*sp, outf);
			fprintf(outf, "%c\n", searchar);
		}
		else {		/* a typedef; text pattern inadequate */
			fprintf(outf, "%s\t%s\t%d\n",
				node->entry, node->file, node->lno);
		}
	else if (vflag)
		fprintf(stdout, "%s %s %d\n",
				node->entry, node->file, (node->lno+63)/64);
	else
		fprintf(stdout, "%-16s%4d %-16s %s\n",
			node->entry, node->lno, node->file, node->pat);
	put_entries(node->right);
}
char	*dbp = lbuf;
int	pfcnt;

PF_funcs(fi)
	FILE *fi;
{

	pfcnt = 0;
	while (fgets(lbuf, sizeof(lbuf), fi)) {
		lineno++;
		dbp = lbuf;
		if ( *dbp == '%' ) dbp++ ;	/* Ratfor escape to fortran */
		while (isspace(*dbp))
			dbp++;
		if (*dbp == 0)
			continue;
		switch (*dbp |' ') {

		  case 'i':
			if (tail("integer"))
				takeprec();
			break;
		  case 'r':
			if (tail("real"))
				takeprec();
			break;
		  case 'l':
			if (tail("logical"))
				takeprec();
			break;
		  case 'c':
			if (tail("complex") || tail("character"))
				takeprec();
			break;
		  case 'd':
			if (tail("double")) {
				while (isspace(*dbp))
					dbp++;
				if (*dbp == 0)
					continue;
				if (tail("precision"))
					break;
				continue;
			}
			break;
		}
		while (isspace(*dbp))
			dbp++;
		if (*dbp == 0)
			continue;
		switch (*dbp|' ') {

		  case 'f':
			if (tail("function"))
				getit();
			continue;
		  case 's':
			if (tail("subroutine"))
				getit();
			continue;
		  case 'p':
			if (tail("program")) {
				getit();
				continue;
			}
			if (tail("procedure"))
				getit();
			continue;
		}
	}
	return (pfcnt);
}

tail(cp)
	char *cp;
{
	register int len = 0;

	while (*cp && (*cp&~' ') == ((*(dbp+len))&~' '))
		cp++, len++;
	if (*cp == 0) {
		dbp += len;
		return (1);
	}
	return (0);
}

takeprec()
{

	while (isspace(*dbp))
		dbp++;
	if (*dbp != '*')
		return;
	dbp++;
	while (isspace(*dbp))
		dbp++;
	if (!isdigit(*dbp)) {
		--dbp;		/* force failure */
		return;
	}
	do
		dbp++;
	while (isdigit(*dbp));
}

getit()
{
	register char *cp;
	char c;
	char nambuf[BUFSIZ];

	for (cp = lbuf; *cp; cp++)
		;
	*--cp = 0;	/* zap newline */
	while (isspace(*dbp))
		dbp++;
	if (*dbp == 0 || !isalpha(*dbp))
		return;
	for (cp = dbp+1; *cp && (isalpha(*cp) || isdigit(*cp)); cp++)
		continue;
	c = cp[0];
	cp[0] = 0;
	strcpy(nambuf, dbp);
	cp[0] = c;
	pfnote(nambuf, lineno);
	pfcnt++;
}

char *
savestr(cp)
	char *cp;
{
	register int len;
	register char *dp;

	len = strlen(cp);
	dp = (char *)malloc(len+1);
	strcpy(dp, cp);
	return (dp);
}

/*
 * Return the ptr in sp at which the character c last
 * appears; NULL if not found
 *
 * Identical to v7 rindex, included for portability.
 */

char *
rindex(sp, c)
register char *sp, c;
{
	register char *r;

	r = NULL;
	do {
		if (*sp == c)
			r = sp;
	} while (*sp++);
	return(r);
}

/*
 * lisp tag functions
 * just look for (def or (DEF
 */

L_funcs (fi)
FILE *fi;
{
	register int	special;

	pfcnt = 0;
	while (fgets(lbuf, sizeof(lbuf), fi)) {
		lineno++;
		dbp = lbuf;
		if (dbp[0] == '(' &&
		    (dbp[1] == 'D' || dbp[1] == 'd') &&
		    (dbp[2] == 'E' || dbp[2] == 'e') &&
		    (dbp[3] == 'F' || dbp[3] == 'f')) {
			dbp += 4;
			if (striccmp(dbp, "method") == 0 ||
			    striccmp(dbp, "wrapper") == 0 ||
			    striccmp(dbp, "whopper") == 0)
				special = TRUE;
			else
				special = FALSE;
			while (!isspace(*dbp))
				dbp++;
			while (isspace(*dbp))
				dbp++;
			L_getit(special);
		}
	}
}

L_getit(special)
int	special;
{
	register char	*cp;
	register char	c;
	char		nambuf[BUFSIZ];

	for (cp = lbuf; *cp; cp++)
		continue;
	*--cp = 0;		/* zap newline */
	if (*dbp == 0)
		return;
	if (special) {
		if ((cp = index(dbp, ')')) == NULL)
			return;
		while (cp >= dbp && *cp != ':')
			cp--;
		if (cp < dbp)
			return;
		dbp = cp;
		while (*cp && *cp != ')' && *cp != ' ')
			cp++;
	}
	else
		for (cp = dbp + 1; *cp && *cp != '(' && *cp != ' '; cp++)
			continue;
	c = cp[0];
	cp[0] = 0;
	strcpy(nambuf, dbp);
	cp[0] = c;
	pfnote(nambuf, lineno,TRUE);
	pfcnt++;
}

/*
 * striccmp:
 *	Compare two strings over the length of the second, ignoring
 *	case distinctions.  If they are the same, return 0.  If they
 *	are different, return the difference of the first two different
 *	characters.  It is assumed that the pattern (second string) is
 *	completely lower case.
 */
striccmp(str, pat)
register char	*str, *pat;
{
	register int	c1;

	while (*pat) {
		if (isupper(*str))
			c1 = tolower(*str);
		else
			c1 = *str;
		if (c1 != *pat)
			return c1 - *pat;
		pat++;
		str++;
	}
	return 0;
}

/*
 * first_char:
 *	Return the first non-blank character in the file.  After
 *	finding it, rewind the input file so we start at the beginning
 *	again.
 */
first_char()
{
	register int	c;
	register long	off;

	off = ftell(inf);
	while ((c = getc(inf)) != EOF)
		if (!isspace(c) && c != '\r') {
			fseek(inf, off, 0);
			return c;
		}
	fseek(inf, off, 0);
	return EOF;
}

/*
 * toss_yysec:
 *	Toss away code until the next "%%" line.
 */
toss_yysec()
{
	char		buf[BUFSIZ];

	for (;;) {
		lineftell = ftell(inf);
		if (fgets(buf, BUFSIZ, inf) == NULL)
			return;
		lineno++;
		if (strncmp(buf, "%%", 2) == 0)
			return;
	}
}
SHAR_EOF
#	End of shell archive
exit 0