/* $Xorg: GetDflt.c,v 1.5 2000/08/17 19:44:34 cpqbld Exp $ */

/***********************************************************

Copyright 1987, 1988, 1998  The Open Group

All Rights Reserved.

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of The Open Group shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from The Open Group.


Copyright 1987, 1988 by Digital Equipment Corporation, Maynard, Massachusetts.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its 
documentation for any purpose and without fee is hereby granted, 
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in 
supporting documentation, and that the name of Digital not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.  

DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.

******************************************************************/
/* $XFree86: xc/lib/X11/GetDflt.c,v 3.18 2001/07/25 15:04:43 dawes Exp $ */

#include "Xlibint.h"
#include <X11/Xos.h>
#include <X11/Xresource.h>

#ifndef X_NOT_POSIX
#ifdef _POSIX_SOURCE
#include <limits.h>
#else
#define _POSIX_SOURCE
#include <limits.h>
#undef _POSIX_SOURCE
#endif
#endif
#ifndef PATH_MAX
#ifdef WIN32
#define PATH_MAX 512
#else
#include <sys/param.h>
#endif
#ifndef PATH_MAX
#ifdef MAXPATHLEN
#define PATH_MAX MAXPATHLEN
#else
#define PATH_MAX 1024
#endif
#endif
#endif

#ifdef XTHREADS
#include <X11/Xthreads.h>
#endif
#ifndef WIN32
#define X_INCLUDE_PWD_H
#define XOS_USE_XLIB_LOCKING
#include <X11/Xos_r.h>
#endif
#include <stdio.h>
#include <ctype.h>


/*ARGSUSED*/
static char *GetHomeDir (dest, len)
    char *dest;
    int len;
{
#ifdef WIN32
    register char *ptr1;
    register char *ptr2;
    int len1 = 0, len2 = 0;

    if (ptr1 = getenv("HOME")) {	/* old, deprecated */
	len1 = strlen (ptr1);
    } else if ((ptr1 = getenv("HOMEDRIVE")) && (ptr2 = getenv("HOMEDIR"))) {
	len1 = strlen (ptr1);
	len2 = strlen (ptr2);
    } else if (ptr2 = getenv("USERNAME")) {
	len1 = strlen (ptr1 = "/users/");
	len2 = strlen (ptr2);
    }
    if ((len1 + len2 + 1) < len)
	sprintf (dest, "%s%s", ptr1, (ptr2) ? ptr2 : "");
    else
	*dest = '\0';
#else
    _Xgetpwparams pwparams;
    struct passwd *pw;
    register char *ptr;

    if (len <= 0 || dest == NULL)
	return NULL;

    if ((ptr = getenv("HOME"))) {
	(void) strncpy(dest, ptr, len-1);
	dest[len-1] = '\0';
    } else {
	if ((ptr = getenv("USER")))
	    pw = _XGetpwnam(ptr,pwparams);
	else
	    pw = _XGetpwuid(getuid(),pwparams);
	if (pw != NULL) {
	    (void) strncpy(dest, pw->pw_dir, len-1);
	    dest[len-1] = '\0';
	} else
	    *dest = '\0';
    }
#endif
    return dest;
}


static XrmDatabase InitDefaults (dpy)
    Display *dpy;			/* display for defaults.... */
{
    XrmDatabase userdb;
    XrmDatabase xdb;
    char fname[PATH_MAX];               /* longer than any conceivable size */
    char *xenv;

    XrmInitialize();

    /*
     * See lib/Xt/Initialize.c
     *
     * First, get the defaults from the server; if none, then load from
     * ~/.Xdefaults.  Next, if there is an XENVIRONMENT environment variable,
     * then load that file.
     */

    if (dpy->xdefaults == NULL) {
	char *slashDotXdefaults = "/.Xdefaults";

	(void) GetHomeDir (fname, PATH_MAX - strlen (slashDotXdefaults) - 1);
	(void) strcat (fname, slashDotXdefaults);
	xdb = XrmGetFileDatabase (fname);
    } else {
	xdb = XrmGetStringDatabase(dpy->xdefaults);
    }

    if (!(xenv = getenv ("XENVIRONMENT"))) {
	char *slashDotXdefaultsDash = "/.Xdefaults-";
	int len;

	(void) GetHomeDir (fname, PATH_MAX - strlen (slashDotXdefaultsDash) - 1);
	(void) strcat (fname, slashDotXdefaultsDash);
	len = strlen (fname);
	(void) _XGetHostname (fname+len, PATH_MAX-len);
	xenv = fname;
    }
    userdb = XrmGetFileDatabase (xenv);
    XrmMergeDatabases (userdb, &xdb);
    return (xdb);

#ifdef old
    if (fname[0] != '\0') userdb =  XrmGetFileDatabase(fname);
    xdb = XrmGetStringDatabase(dpy->xdefaults);
    XrmMergeDatabases(userdb, &xdb);
    return xdb;
#endif
}

#if NeedFunctionPrototypes
char *XGetDefault(
	Display *dpy,			/* display for defaults.... */
	char _Xconst *prog,		/* name of program for option	*/
	register _Xconst char *name)	/* name of option program wants */
#else
char *XGetDefault(dpy, prog, name)
	Display *dpy;			/* display for defaults.... */
	char *prog;			/* name of program for option	*/
	register char *name;		/* name of option program wants */
#endif
{					/* to get, for example, "font"  */
	XrmName names[3];
	XrmClass classes[3];
	XrmRepresentation fromType;
	XrmValue result;
	char *progname;
#ifdef WIN32
	char *progname2;
#endif
#ifdef __EMX__
	char *progname2;
	char *dotpos;
#endif

	/*
	 * strip path off of program name (XXX - this is OS specific)
	 */
	progname = strrchr (prog, '/');
#ifdef WIN32
	progname2 = strrchr (prog, '\\');
	if (progname2 && (!progname || progname < progname2))
	    progname = progname2;
#endif
#ifdef __EMX__  /* Very similar to WIN32 */
	progname2 = strrchr (prog, '\\');
	if (progname2 && (!progname || progname < progname2))
	    progname = progname2;
	dotpos = strrchr (prog, '.');
	if (dotpos && (dotpos>progname2)) *dotpos='\0';
#endif  /* We take out the .exe suffix  */

	if (progname)
	    progname++;
	else
	    progname = (char *)prog;

	/*
	 * see if database has ever been initialized.  Lookups can be done
	 * without locks held.
	 */
	LockDisplay(dpy);
	if (dpy->db == NULL) {
		dpy->db = InitDefaults(dpy);
		}
	UnlockDisplay(dpy);

	names[0] = XrmStringToName(progname);
	names[1] = XrmStringToName(name);
	names[2] = NULLQUARK;
	classes[0] = XrmStringToClass("Program");
	classes[1] = XrmStringToClass("Name");
	classes[2] = NULLQUARK;
	(void)XrmQGetResource(dpy->db, names, classes, &fromType, &result);
	return (result.addr);
}