Path: utzoo!mnetor!uunet!lll-winken!lll-lcc!ptsfa!cpro!asgard
From: asgard@cpro.UUCP (J.R. Stoner)
Newsgroups: comp.sources.d
Subject: Re: HELP with vn
Message-ID: <379@cpro.UUCP>
Date: 22 Feb 88 23:16:22 GMT
References: <6800@drutx.ATT.COM>
Organization: CompuPro/VIASYN Corporation, Hayward, CA
Lines: 249

From article <6800@drutx.ATT.COM>, by clive@drutx.ATT.COM (Clive Steward):
> From article <163@magic4.UUCP>, by eric@magic4.UUCP (Eric Kozowski):
>> Could someone please help me with this problem.  Here is the output
>> from a make on vn:
>> undefined			first referenced
>>  symbol  			    in file
>> regcmp                              reader.o
>> regex                               reader.o
>> I'm running Sys V 3.1 on an AT&T 3B2/400.  Please help.

> Here is how to fix such things.
> Take your Unix Manuals.  Look up regcmp in the permuted index.  You'll find 
> man pages listed in section 3, which is in the Programmer Reference Manual.
> There you will see that 'this routine is kept in /lib/libPW.a'.
> If you are familiar with ld, or read the man pages (Section 1, User
> Reference Manual), you will know that such a library is automatically
> included by putting the shorter -lPW on the cc command line.

> So, let's edit the Makefile.  Comment out the LIBS definition, and
> replace it as follows:

> #LIBS = -ltermcap
> LIBS = -lcurses -lPW

> We'll do one thing more; curses is a later replacement for termcap,
> and usually a bit better, so we substitute that library as well.

Not only that, but vanilla SYS5 curses has the termcap functions in libcurses.

> If you turn out to have screen problems for some reason, you can alternatively
> use:

> LIBS = -lcurses -lPW

> Once you've edited the Makefile, re-make vn.
> This should work.  Hope you have good fortune with it.

This will get you past linking the program but the first attempt to match a
regular expression might just cause a segmentation violation.

This is the patch to reg.c which makes vanilla regex work with vn:
[Note - you must also REMOVE the -Dfree=regfree from your CFLAGS line in
your Makefile].

*** oreg.c	Fri Feb  5 21:30:56 1988
--- reg.c	Mon Feb 22 14:36:01 1988
***************
*** 45,50
  	}
  }
  
  char *regcmp(str)
  char *str;
  {

--- 45,65 -----
  	}
  }
  
+ #ifdef SYSV
+ 
+ char			*re_expbuf;
+ char			*re_ss;
+ extern	char		*malloc();
+ #define	INIT		char *sp = instring;
+ #define	GETC()		(*sp++)
+ #define	PEEKC()		(*sp)
+ #define	UNGETC(c)	(--sp)
+ #define	RETURN(c)	re_ss = c; return((char *)0)
+ #define	ERROR(c)	return((char *)c)
+ #include		<regexp.h>
+ 
+ #endif
+ 
  char *regcmp(str)
  char *str;
  {
***************
*** 50,56
  {
  	int i;
  	char *str_store();
- 	char *re_comp();
  
  	if (re_comp(str) != NULL)
  	{

--- 65,70 -----
  {
  	int i;
  	char *str_store();
  
  #ifdef SYSV
  
***************
*** 52,57
  	char *str_store();
  	char *re_comp();
  
  	if (re_comp(str) != NULL)
  	{
  		Compiled = NULL;	/* make sure we're OK */

--- 66,85 -----
  	int i;
  	char *str_store();
  
+ #ifdef SYSV
+ 
+ 	char	*compile();
+ 	if(re_expbuf == (char *)NULL)
+ 	{
+ 		re_expbuf = (char *)malloc(512);
+ 		if(re_expbuf == (char *)NULL)
+ 			printex("regcmp: memory allocation failure");
+ 	}
+ 	if(compile(str,re_expbuf,re_expbuf + 512,'\0') != (char *)0)
+ 
+ #else
+ 
+ 	char *re_comp();
  	if (re_comp(str) != NULL)
  
  #endif
***************
*** 53,58
  	char *re_comp();
  
  	if (re_comp(str) != NULL)
  	{
  		Compiled = NULL;	/* make sure we're OK */
  		return(NULL);

--- 81,89 -----
  
  	char *re_comp();
  	if (re_comp(str) != NULL)
+ 
+ #endif
+ 
  	{
  		Compiled = NULL;	/* make sure we're OK */
  		return(NULL);
***************
*** 87,92
  
  	if (cmp == Compiled)
  	{
  		if (re_exec(str))
  			return(str);
  		return (NULL);

--- 118,130 -----
  
  	if (cmp == Compiled)
  	{
+ 
+ #ifdef SYSV
+ 
+ 		if(step(str,re_expbuf) != 0)
+ 
+ #else
+ 
  		if (re_exec(str))
  
  #endif
***************
*** 88,93
  	if (cmp == Compiled)
  	{
  		if (re_exec(str))
  			return(str);
  		return (NULL);
  	}

--- 126,134 -----
  #else
  
  		if (re_exec(str))
+ 
+ #endif
+ 
  			return(str);
  		return (NULL);
  	}
***************
*** 101,107
  	if (Compiled == NULL)
  		printex ("regex: bad pointer");
  
! 	re_comp(Compiled->regstr);
  
  	if (re_exec(str))
  		return(str);

--- 142,148 -----
  	if (Compiled == NULL)
  		printex ("regex: bad pointer");
  
! #ifdef SYSV
  
  	(void)compile(str,re_expbuf,re_expbuf + 512,'\0');
  	if(step(str,re_expbuf) != 0)
***************
*** 103,108
  
  	re_comp(Compiled->regstr);
  
  	if (re_exec(str))
  		return(str);
  

--- 144,155 -----
  
  #ifdef SYSV
  
+ 	(void)compile(str,re_expbuf,re_expbuf + 512,'\0');
+ 	if(step(str,re_expbuf) != 0)
+ 
+ #else
+ 
+ 	re_comp(Compiled->regstr);
  	if (re_exec(str))
  
  #endif
***************
*** 104,109
  	re_comp(Compiled->regstr);
  
  	if (re_exec(str))
  		return(str);
  
  	return(NULL);

--- 151,159 -----
  
  	re_comp(Compiled->regstr);
  	if (re_exec(str))
+ 
+ #endif
+ 
  		return(str);
  
  	return(NULL);

[I hope this works out for you.  It makes vn work in a Microport 286 kernel.]
-- 
"To prevent having to tell fools to RTFM don't let on you WTFM to begin with."
J.R. Stoner	asgard@cpro.UUCP    asgard@wotan.UUCP
P.S. I help CompuPro make computers.  They do not help me make my opinions.