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Add a global-wd-mode command, which toggles between the current
behavior (every buffer maintains its own cwd) and the old behavior of
one global working directory. This makes it slightly easier to hack
on things like kernel code, where compilation, etc, are initiated from
a different directory than you are working in.
While here, fix setting/handling of global wd.

/*	$OpenBSD: dir.c,v 1.18 2007/05/28 17:52:17 kjell Exp $	*/

/* This file is in the public domain. */

/*
 * Name:	MG 2a
 *		Directory management functions
 * Created:	Ron Flax (ron@vsedev.vse.com)
 *		Modified for MG 2a by Mic Kaczmarczik 03-Aug-1987
 */

#include "def.h"

static char	 mgcwd[NFILEN];

/*
 * Initialize anything the directory management routines need.
 */
void
dirinit(void)
{
	mgcwd[0] = '\0';
	if (getcwd(mgcwd, sizeof(mgcwd)) == NULL) {
		ewprintf("Can't get current directory!");
		chdir("/");
	}
	(void)strlcat(mgcwd, "/", sizeof(mgcwd));
}

/*
 * Change current working directory.
 */
/* ARGSUSED */
int
changedir(int f, int n)
{
	char	bufc[NFILEN], *bufp;

	(void)strlcpy(bufc, mgcwd, sizeof(bufc));
	if ((bufp = eread("Change default directory: ", bufc, NFILEN,
	    EFDEF | EFNEW | EFCR | EFFILE)) == NULL)
		return (ABORT);
	else if (bufp[0] == '\0')
		return (FALSE);
	/* Append trailing slash */
	if (chdir(bufc) == -1) {
		ewprintf("Can't change dir to %s", bufc);
		return (FALSE);
	}
	if ((bufp = getcwd(mgcwd, sizeof(mgcwd))) == NULL)
		panic("Can't get current directory!");
	if (mgcwd[strlen(mgcwd) - 1] != '/')
		(void)strlcat(mgcwd, "/", sizeof(mgcwd));
	ewprintf("Current directory is now %s", bufp);
	return (TRUE);
}

/*
 * Show current directory.
 */
/* ARGSUSED */
int
showcwdir(int f, int n)
{
	ewprintf("Current directory: %s", mgcwd);
	return (TRUE);
}

int
getcwdir(char *buf, size_t len)
{
	if (strlcpy(buf, mgcwd, len) >= len)
		return (FALSE);

	return (TRUE);
}