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From: daemon@hplabsc.UUCP
Newsgroups: comp.mail.elm
Subject: Elm installation problems
Message-ID: <1745@hplabsc.HP.COM>
Date: Thu, 7-May-87 10:06:01 EDT
Article-I.D.: hplabsc.1745
Posted: Thu May  7 10:06:01 1987
Date-Received: Sat, 9-May-87 05:36:59 EDT
Sender: daemon@hplabsc.HP.COM
Reply-To: taylor@hpldat (Dave Taylor)
Organization: Hewlett-Packard Laboratories, Interface Technologies Group
Lines: 73
Approved: taylor@hplabs (with 'postmail')

From: tektronix!sequent!sch@hplabs.HP.COM (Steve Hemminger)
Subject: Elm installation problems
Date: Wed, 6 May 87 8:49:39 PDT

Overall, I would have to rate the portablity of Elm as medium.  It tries to
be portable off HP-UX/System V systems but has some basic flaws

I managed to bring it up with minor tweaks.

0) Configure does not know about Sequent
	a) /dynix is name of kernel
	b) build time improves by factor of 20 by using parallel make files
	   but others don't have that luxury.

1) Configure.sh problems on BSD systems
	a) bsd test does not support -c flag

	b) dirname command not found
		no dirname command (at least in UCB universe)

2) Fseek problems
	a) fseek (on Dynix 2.1) returns offset on sucess and -1 on error
	   This is similar to BSD 4.3
	   had to change all if(fseek(...)) to if( fseek(...) == -1)

3) Terminal problems
	Padding problem on SO/SE
	need to rip padding chars (digits) off front of strings
---

char *return_value_of(termcap_label)
char *termcap_label;
{
	/** This will return the string kept by termcap for the 
	    specified capability. Modified to ensure that if 
	    tgetstr returns a pointer to a transient address	
	    that we won't bomb out with a later segmentation
	    fault (thanks to Dave@Infopro for this one!)

	    Tweaked to remove padding sequences.
	 **/

	register char *cp;
	static char escape_sequence[20];
	char *tgetstr();     		/* Get termcap capability */

	if (strlen(termcap_label) < 2)
	  return(NULL);

	if (termcap_label[0] == 's' && termcap_label[1] == 'o')
	  cp = _setinverse;
	else if (termcap_label[0] == 's' && termcap_label[1] == 'e')
	  cp = _clearinverse;
	else if ((cp = tgetstr(termcap_label, &ptr)) == NULL)
	  return( (char *) NULL );

	while (*cp && isascii(*cp) && isdigit(*cp))
		++cp;

	strcpy(escape_sequence, cp);

	return (escape_sequence);
}
---
	tgoto needs UP and BC (global char *)
	tputs needs ospeed and PC to determine padding

4) can't handle other forms of mail file locking
	BSD 4.3 (and Tektronix UTek) use flock to lock the mailbox.
	should ask about location name of lockfile...

--
<sequent!sch> steve hemminger (a.k.a netbuster)