src/xrdb.c

   1 /* Deal with the X Resource Manager.
   2    Copyright (C) 1990, 1993, 1994, 2000, 2001 Free Software Foundation.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 /* Written by jla, 4/90 */
  22
  23 #ifdef emacs
  24 #include <config.h>
  25 #endif
  26
  27 #ifdef HAVE_UNISTD_H
  28 #include <unistd.h>
  29 #endif
  30
  31 #include <epaths.h>
  32
  33 #include <stdio.h>
  34
  35 #if 1 /* I'd really appreciate it if this code could go away...  -JimB */
  36 /* This avoids lossage in the `dual-universe' headers on AT&T SysV
  37    X11.  Don't do it on Solaris, because it breaks compilation with
  38    XFree86 4.0.3 (and probably many other X11R6 releases) on Solaris
  39    2 */
  40 #if defined(USG5) && !defined(SOLARIS2)
  41 #ifndef SYSV
  42 #define SYSV
  43 #endif
  44 #endif /* USG5 && !SOLARIS2 */
  45
  46 #endif /* 1 */
  47
  48 #include <X11/Xlib.h>
  49 #include <X11/Xatom.h>
  50 #if 0
  51 #include <X11/Xos.h>
  52 #endif
  53 #include <X11/X.h>
  54 #include <X11/Xutil.h>
  55 #include <X11/Xresource.h>
  56 #ifdef VMS
  57 #include "vms-pwd.h"
  58 #else
  59 #include <pwd.h>
  60 #endif
  61 #include <sys/stat.h>
  62
  63 #if !defined(S_ISDIR) && defined(S_IFDIR)
  64 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
  65 #endif
  66
  67 #include "lisp.h"
  68
  69 extern char *getenv ();
  70
  71 /* This does cause trouble on AIX.  I'm going to take the comment at
  72    face value.  */
  73 #if 0
  74 extern short getuid ();         /* If this causes portability problems,
  75                                    I think we should just delete it; it'll
  76                                    default to `int' anyway.  */
  77 #endif
  78
  79 #ifdef DECLARE_GETPWUID_WITH_UID_T
  80 extern struct passwd *getpwuid (uid_t);
  81 extern struct passwd *getpwnam (const char *);
  82 #else
  83 extern struct passwd *getpwuid ();
  84 extern struct passwd *getpwnam ();
  85 #endif
  86
  87 extern char *get_system_name ();
  88
  89 /* Make sure not to #include anything after these definitions.  Let's
  90    not step on anyone's prototypes.  */
  91 #ifdef emacs
  92 #define malloc xmalloc
  93 #define realloc xrealloc
  94 #define free xfree
  95 #endif
  96
  97 char *x_get_string_resource ();
  98 static int file_p ();
  99
 100 \f
 101 /* X file search path processing.  */
 102
 103
 104 /* The string which gets substituted for the %C escape in XFILESEARCHPATH
 105    and friends, or zero if none was specified.  */
 106 char *x_customization_string;
 107
 108
 109 /* Return the value of the emacs.customization (Emacs.Customization)
 110    resource, for later use in search path decoding.  If we find no
 111    such resource, return zero.  */
 112 char *
 113 x_get_customization_string (db, name, class)
 114      XrmDatabase db;
 115      char *name, *class;
 116 {
 117   char *full_name
 118     = (char *) alloca (strlen (name) + sizeof ("customization") + 3);
 119   char *full_class
 120     = (char *) alloca (strlen (class) + sizeof ("Customization") + 3);
 121   char *result;
 122
 123   sprintf (full_name,  "%s.%s", name,  "customization");
 124   sprintf (full_class, "%s.%s", class, "Customization");
 125
 126   result = x_get_string_resource (db, full_name, full_class);
 127
 128   if (result)
 129     {
 130       char *copy = (char *) malloc (strlen (result) + 1);
 131       strcpy (copy, result);
 132       return copy;
 133     }
 134   else
 135     return 0;
 136 }
 137
 138
 139 /* Expand all the Xt-style %-escapes in STRING, whose length is given
 140    by STRING_LEN.  Here are the escapes we're supposed to recognize:
 141
 142         %N      The value of the application's class name
 143         %T      The value of the type parameter ("app-defaults" in this
 144                 context)
 145         %S      The value of the suffix parameter ("" in this context)
 146         %L      The language string associated with the specified display
 147                 (We use the "LANG" environment variable here, if it's set.)
 148         %l      The language part of the display's language string
 149                 (We treat this just like %L.  If someone can tell us what
 150                  we're really supposed to do, dandy.)
 151         %t      The territory part of the display's language string
 152                 (This never gets used.)
 153         %c      The codeset part of the display's language string
 154                 (This never gets used either.)
 155         %C      The customization string retrieved from the resource
 156                 database associated with display.
 157                 (This is x_customization_string.)
 158
 159    Return the expanded file name if it exists and is readable, and
 160    refers to %L only when the LANG environment variable is set, or
 161    otherwise provided by X.
 162
 163    ESCAPED_SUFFIX and SUFFIX are postpended to STRING if they are
 164    non-zero.  %-escapes in ESCAPED_SUFFIX are expanded; STRING is left
 165    alone.
 166
 167    Return NULL otherwise.  */
 168
 169 static char *
 170 magic_file_p (string, string_len, class, escaped_suffix, suffix)
 171      char *string;
 172      int string_len;
 173      char *class, *escaped_suffix, *suffix;
 174 {
 175   char *lang = getenv ("LANG");
 176
 177   int path_size = 100;
 178   char *path = (char *) malloc (path_size);
 179   int path_len = 0;
 180
 181   char *p = string;
 182
 183   while (p < string + string_len)
 184     {
 185       /* The chunk we're about to stick on the end of result.  */
 186       char *next = NULL;
 187       int next_len;
 188
 189       if (*p == '%')
 190         {
 191           p++;
 192
 193           if (p >= string + string_len)
 194             next_len = 0;
 195           else
 196             switch (*p)
 197               {
 198               case '%':
 199                 next = "%";
 200                 next_len = 1;
 201                 break;
 202
 203               case 'C':
 204                 next = (x_customization_string
 205                         ? x_customization_string
 206                         : "");
 207                 next_len = strlen (next);
 208                 break;
 209
 210               case 'N':
 211                 next = class;
 212                 next_len = strlen (class);
 213                 break;
 214
 215               case 'T':
 216                 next = "app-defaults";
 217                 next_len = strlen (next);
 218                 break;
 219
 220               default:
 221               case 'S':
 222                 next_len = 0;
 223                 break;
 224
 225               case 'L':
 226               case 'l':
 227                 if (! lang)
 228                   {
 229                     free (path);
 230                     return NULL;
 231                   }
 232
 233                 next = lang;
 234                 next_len = strlen (next);
 235                 break;
 236
 237               case 't':
 238               case 'c':
 239                 free (path);
 240                 return NULL;
 241               }
 242         }
 243       else
 244         next = p, next_len = 1;
 245
 246       /* Do we have room for this component followed by a '\0' ?  */
 247       if (path_len + next_len + 1 > path_size)
 248         {
 249           path_size = (path_len + next_len + 1) * 2;
 250           path = (char *) realloc (path, path_size);
 251         }
 252
 253       bcopy (next, path + path_len, next_len);
 254       path_len += next_len;
 255
 256       p++;
 257
 258       /* If we've reached the end of the string, append ESCAPED_SUFFIX.  */
 259       if (p >= string + string_len && escaped_suffix)
 260         {
 261           string = escaped_suffix;
 262           string_len = strlen (string);
 263           p = string;
 264           escaped_suffix = NULL;
 265         }
 266     }
 267
 268   /* Perhaps we should add the SUFFIX now.  */
 269   if (suffix)
 270     {
 271       int suffix_len = strlen (suffix);
 272
 273       if (path_len + suffix_len + 1 > path_size)
 274         {
 275           path_size = (path_len + suffix_len + 1);
 276           path = (char *) realloc (path, path_size);
 277         }
 278
 279       bcopy (suffix, path + path_len, suffix_len);
 280       path_len += suffix_len;
 281     }
 282
 283   path[path_len] = '\0';
 284
 285   if (! file_p (path))
 286     {
 287       free (path);
 288       return NULL;
 289     }
 290
 291   return path;
 292 }
 293
 294
 295 static char *
 296 gethomedir ()
 297 {
 298   struct passwd *pw;
 299   char *ptr;
 300   char *copy;
 301
 302   if ((ptr = getenv ("HOME")) == NULL)
 303     {
 304       if ((ptr = getenv ("LOGNAME")) != NULL
 305           || (ptr = getenv ("USER")) != NULL)
 306         pw = getpwnam (ptr);
 307       else
 308         pw = getpwuid (getuid ());
 309
 310       if (pw)
 311         ptr = pw->pw_dir;
 312     }
 313
 314   if (ptr == NULL)
 315     return "/";
 316
 317   copy = (char *) malloc (strlen (ptr) + 2);
 318   strcpy (copy, ptr);
 319   strcat (copy, "/");
 320
 321   return copy;
 322 }
 323
 324
 325 static int
 326 file_p (filename)
 327      char *filename;
 328 {
 329   struct stat status;
 330
 331   return (access (filename, 4) == 0             /* exists and is readable */
 332           && stat (filename, &status) == 0      /* get the status */
 333           && (S_ISDIR (status.st_mode)) == 0);  /* not a directory */
 334 }
 335
 336
 337 /* Find the first element of SEARCH_PATH which exists and is readable,
 338    after expanding the %-escapes.  Return 0 if we didn't find any, and
 339    the path name of the one we found otherwise.  */
 340
 341 static char *
 342 search_magic_path (search_path, class, escaped_suffix, suffix)
 343      char *search_path, *class, *escaped_suffix, *suffix;
 344 {
 345   register char *s, *p;
 346
 347   for (s = search_path; *s; s = p)
 348     {
 349       for (p = s; *p && *p != ':'; p++)
 350         ;
 351
 352       if (p > s)
 353         {
 354           char *path = magic_file_p (s, p - s, class, escaped_suffix, suffix);
 355           if (path)
 356             return path;
 357         }
 358       else if (*p == ':')
 359         {
 360           char *path;
 361
 362           s = "%N%S";
 363           path = magic_file_p (s, strlen (s), class, escaped_suffix, suffix);
 364           if (path)
 365             return path;
 366         }
 367
 368       if (*p == ':')
 369         p++;
 370     }
 371
 372   return 0;
 373 }
 374 \f
 375 /* Producing databases for individual sources.  */
 376
 377 static XrmDatabase
 378 get_system_app (class)
 379      char *class;
 380 {
 381   XrmDatabase db = NULL;
 382   char *path;
 383
 384   path = getenv ("XFILESEARCHPATH");
 385   if (! path) path = PATH_X_DEFAULTS;
 386
 387   path = search_magic_path (path, class, 0, 0);
 388   if (path)
 389     {
 390       db = XrmGetFileDatabase (path);
 391       free (path);
 392     }
 393
 394   return db;
 395 }
 396
 397
 398 static XrmDatabase
 399 get_fallback (display)
 400      Display *display;
 401 {
 402   return NULL;
 403 }
 404
 405
 406 static XrmDatabase
 407 get_user_app (class)
 408      char *class;
 409 {
 410   char *path;
 411   char *file = 0;
 412   char *free_it = 0;
 413
 414   /* Check for XUSERFILESEARCHPATH.  It is a path of complete file
 415      names, not directories.  */
 416   if (((path = getenv ("XUSERFILESEARCHPATH"))
 417        && (file = search_magic_path (path, class, 0, 0)))
 418
 419       /* Check for APPLRESDIR; it is a path of directories.  In each,
 420          we have to search for LANG/CLASS and then CLASS.  */
 421       || ((path = getenv ("XAPPLRESDIR"))
 422           && ((file = search_magic_path (path, class, "/%L/%N", 0))
 423               || (file = search_magic_path (path, class, "/%N", 0))))
 424
 425       /* Check in the home directory.  This is a bit of a hack; let's
 426          hope one's home directory doesn't contain any %-escapes.  */
 427       || (free_it = gethomedir (),
 428           ((file = search_magic_path (free_it, class, "%L/%N", 0))
 429            || (file = search_magic_path (free_it, class, "%N", 0)))))
 430     {
 431       XrmDatabase db = XrmGetFileDatabase (file);
 432       free (file);
 433       if (free_it)
 434         free (free_it);
 435       return db;
 436     }
 437
 438   if (free_it)
 439     free (free_it);
 440   return NULL;
 441 }
 442
 443
 444 static XrmDatabase
 445 get_user_db (display)
 446      Display *display;
 447 {
 448   XrmDatabase db;
 449   char *xdefs;
 450
 451 #ifdef PBaseSize                /* Cheap way to test for X11R4 or later.  */
 452   xdefs = XResourceManagerString (display);
 453 #else
 454   xdefs = display->xdefaults;
 455 #endif
 456
 457   if (xdefs != NULL)
 458     db = XrmGetStringDatabase (xdefs);
 459   else
 460     {
 461       char *home;
 462       char *xdefault;
 463
 464       home = gethomedir ();
 465       xdefault = (char *) malloc (strlen (home) + sizeof (".Xdefaults"));
 466       strcpy (xdefault, home);
 467       strcat (xdefault, ".Xdefaults");
 468       db = XrmGetFileDatabase (xdefault);
 469       free (home);
 470       free (xdefault);
 471     }
 472
 473 #ifdef HAVE_XSCREENRESOURCESTRING
 474   /* Get the screen-specific resources too.  */
 475   xdefs = XScreenResourceString (DefaultScreenOfDisplay (display));
 476   if (xdefs != NULL)
 477     {
 478       XrmMergeDatabases (XrmGetStringDatabase (xdefs), &db);
 479       XFree (xdefs);
 480     }
 481 #endif
 482
 483   return db;
 484 }
 485
 486 static XrmDatabase
 487 get_environ_db ()
 488 {
 489   XrmDatabase db;
 490   char *p;
 491   char *path = 0, *home = 0, *host;
 492
 493   if ((p = getenv ("XENVIRONMENT")) == NULL)
 494     {
 495       home = gethomedir ();
 496       host = get_system_name ();
 497       path = (char *) malloc (strlen (home)
 498                               + sizeof (".Xdefaults-")
 499                               + strlen (host));
 500       sprintf (path, "%s%s%s", home, ".Xdefaults-", host);
 501       p = path;
 502     }
 503
 504   db = XrmGetFileDatabase (p);
 505
 506   if (path) free (path);
 507   if (home) free (home);
 508
 509   return db;
 510 }
 511 \f
 512 /* External interface.  */
 513
 514 /* Types of values that we can find in a database */
 515
 516 #define XrmStringType "String"  /* String representation */
 517 XrmRepresentation x_rm_string;  /* Quark representation */
 518
 519 /* Load X resources based on the display and a possible -xrm option. */
 520
 521 XrmDatabase
 522 x_load_resources (display, xrm_string, myname, myclass)
 523      Display *display;
 524      char *xrm_string, *myname, *myclass;
 525 {
 526   XrmDatabase user_database;
 527   XrmDatabase rdb;
 528   XrmDatabase db;
 529   char line[256];
 530   char *helv = "-*-helvetica-medium-r-*--*-120-*-*-*-*-iso8859-1";
 531 #ifdef USE_MOTIF
 532   char *courier = "-*-courier-medium-r-*-*-*-120-*-*-*-*-iso8859-1";
 533   extern Lisp_Object Vdouble_click_time;
 534 #endif
 535
 536   x_rm_string = XrmStringToQuark (XrmStringType);
 537 #ifndef USE_X_TOOLKIT
 538   /* pmr@osf.org says this shouldn't be done if USE_X_TOOLKIT.
 539      I suspect it's because the toolkit version does this elsewhere.  */
 540   XrmInitialize ();
 541 #endif
 542   rdb = XrmGetStringDatabase ("");
 543
 544   /* Add some font defaults.  If the font `helv' doesn't exist, widgets
 545      will use some other default font.  */
 546 #ifdef USE_MOTIF
 547
 548   sprintf (line, "%s.pane.background: grey75", myclass);
 549   XrmPutLineResource (&rdb, line);
 550   sprintf (line, "%s*fontList: %s", myclass, helv);
 551   XrmPutLineResource (&rdb, line);
 552   sprintf (line, "%s*menu*background: grey75", myclass);
 553   XrmPutLineResource (&rdb, line);
 554   sprintf (line, "%s*menubar*background: grey75", myclass);
 555   XrmPutLineResource (&rdb, line);
 556   sprintf (line, "%s*verticalScrollBar.background: grey75", myclass);
 557   XrmPutLineResource (&rdb, line);
 558   sprintf (line, "%s*verticalScrollBar.troughColor: grey75", myclass);
 559   XrmPutLineResource (&rdb, line);
 560   sprintf (line, "%s.dialog*.background: grey75", myclass);
 561   XrmPutLineResource (&rdb, line);
 562   sprintf (line, "%s*fsb.Text.background: white", myclass);
 563   XrmPutLineResource (&rdb, line);
 564   sprintf (line, "%s*fsb.FilterText.background: white", myclass);
 565   XrmPutLineResource (&rdb, line);
 566   sprintf (line, "%s*fsb*DirList.background: white", myclass);
 567   XrmPutLineResource (&rdb, line);
 568   sprintf (line, "%s*fsb*ItemsList.background: white", myclass);
 569   XrmPutLineResource (&rdb, line);
 570   sprintf (line, "%s*fsb*background: grey75", myclass);
 571   XrmPutLineResource (&rdb, line);
 572   sprintf (line, "%s*fsb.Text.fontList: %s", myclass, courier);
 573   XrmPutLineResource (&rdb, line);
 574   sprintf (line, "%s*fsb.FilterText.fontList: %s", myclass, courier);
 575   XrmPutLineResource (&rdb, line);
 576   sprintf (line, "%s*fsb*ItemsList.fontList: %s", myclass, courier);
 577   XrmPutLineResource (&rdb, line);
 578   sprintf (line, "%s*fsb*DirList.fontList: %s", myclass, courier);
 579   XrmPutLineResource (&rdb, line);
 580
 581   /* Set double click time of list boxes in the file selection
 582      dialog from `double-click-time'.  */
 583   if (INTEGERP (Vdouble_click_time) && XINT (Vdouble_click_time) > 0)
 584     {
 585       sprintf (line, "%s*fsb*DirList.doubleClickInterval: %d",
 586                myclass, XFASTINT (Vdouble_click_time));
 587       XrmPutLineResource (&rdb, line);
 588       sprintf (line, "%s*fsb*ItemsList.doubleClickInterval: %d",
 589                myclass, XFASTINT (Vdouble_click_time));
 590       XrmPutLineResource (&rdb, line);
 591     }
 592
 593 #else /* not USE_MOTIF */
 594
 595   sprintf (line, "Emacs.dialog*.font: %s", helv);
 596   XrmPutLineResource (&rdb, line);
 597   sprintf (line, "Emacs.dialog*.background: grey75");
 598   XrmPutLineResource (&rdb, line);
 599   sprintf (line, "*XlwMenu*font: %s", helv);
 600   XrmPutLineResource (&rdb, line);
 601   sprintf (line, "*XlwMenu*background: grey75");
 602   XrmPutLineResource (&rdb, line);
 603   sprintf (line, "Emacs*verticalScrollBar.background: grey75");
 604   XrmPutLineResource (&rdb, line);
 605
 606 #endif /* not USE_MOTIF */
 607
 608   user_database = get_user_db (display);
 609
 610   /* Figure out what the "customization string" is, so we can use it
 611      to decode paths.  */
 612   if (x_customization_string)
 613     free (x_customization_string);
 614   x_customization_string
 615     = x_get_customization_string (user_database, myname, myclass);
 616
 617   /* Get application system defaults */
 618   db = get_system_app (myclass);
 619   if (db != NULL)
 620     XrmMergeDatabases (db, &rdb);
 621
 622   /* Get Fallback resources */
 623   db = get_fallback (display);
 624   if (db != NULL)
 625     XrmMergeDatabases (db, &rdb);
 626
 627   /* Get application user defaults */
 628   db = get_user_app (myclass);
 629   if (db != NULL)
 630     XrmMergeDatabases (db, &rdb);
 631
 632   /* get User defaults */
 633   if (user_database != NULL)
 634     XrmMergeDatabases (user_database, &rdb);
 635
 636   /* Get Environment defaults. */
 637   db = get_environ_db ();
 638   if (db != NULL)
 639     XrmMergeDatabases (db, &rdb);
 640
 641   /* Last, merge in any specification from the command line. */
 642   if (xrm_string != NULL)
 643     {
 644       db = XrmGetStringDatabase (xrm_string);
 645       if (db != NULL)
 646         XrmMergeDatabases (db, &rdb);
 647     }
 648
 649   return rdb;
 650 }
 651
 652
 653 /* Retrieve the value of the resource specified by NAME with class CLASS
 654    and of type TYPE from database RDB.  The value is returned in RET_VALUE. */
 655
 656 int
 657 x_get_resource (rdb, name, class, expected_type, ret_value)
 658      XrmDatabase rdb;
 659      char *name, *class;
 660      XrmRepresentation expected_type;
 661      XrmValue *ret_value;
 662 {
 663   XrmValue value;
 664   XrmName namelist[100];
 665   XrmClass classlist[100];
 666   XrmRepresentation type;
 667
 668   XrmStringToNameList(name, namelist);
 669   XrmStringToClassList(class, classlist);
 670
 671   if (XrmQGetResource (rdb, namelist, classlist, &type, &value) == True
 672       && (type == expected_type))
 673     {
 674       if (type == x_rm_string)
 675         ret_value->addr = (char *) value.addr;
 676       else
 677         bcopy (value.addr, ret_value->addr, ret_value->size);
 678
 679       return value.size;
 680     }
 681
 682   return 0;
 683 }
 684
 685 /* Retrieve the string resource specified by NAME with CLASS from
 686    database RDB. */
 687
 688 char *
 689 x_get_string_resource (rdb, name, class)
 690      XrmDatabase rdb;
 691      char *name, *class;
 692 {
 693   XrmValue value;
 694
 695   if (x_get_resource (rdb, name, class, x_rm_string, &value))
 696     return (char *) value.addr;
 697
 698   return (char *) 0;
 699 }
 700 \f
 701 /* Stand-alone test facilities.  */
 702
 703 #ifdef TESTRM
 704
 705 typedef char **List;
 706 #define arg_listify(len, list) (list)
 707 #define car(list) (*(list))
 708 #define cdr(list) (list + 1)
 709 #define NIL(list) (! *(list))
 710 #define free_arglist(list)
 711
 712 static List
 713 member (elt, list)
 714      char *elt;
 715      List list;
 716 {
 717   List p;
 718
 719   for (p = list; ! NIL (p); p = cdr (p))
 720     if (! strcmp (elt, car (p)))
 721       return p;
 722
 723   return p;
 724 }
 725
 726 static void
 727 fatal (msg, prog, x1, x2, x3, x4, x5)
 728     char *msg, *prog;
 729     int x1, x2, x3, x4, x5;
 730 {
 731     extern int errno;
 732
 733     if (errno)
 734       perror (prog);
 735
 736     (void) fprintf (stderr, msg, prog, x1, x2, x3, x4, x5);
 737     exit (1);
 738 }
 739
 740 main (argc, argv)
 741     int argc;
 742     char **argv;
 743 {
 744   Display *display;
 745   char *displayname, *resource_string, *class, *name;
 746   XrmDatabase xdb;
 747   List arg_list, lp;
 748
 749   arg_list = arg_listify (argc, argv);
 750
 751   lp = member ("-d", arg_list);
 752   if (!NIL (lp))
 753     displayname = car (cdr (lp));
 754   else
 755     displayname = "localhost:0.0";
 756
 757   lp = member ("-xrm", arg_list);
 758   if (! NIL (lp))
 759     resource_string = car (cdr (lp));
 760   else
 761     resource_string = (char *) 0;
 762
 763   lp = member ("-c", arg_list);
 764   if (! NIL (lp))
 765     class = car (cdr (lp));
 766   else
 767     class = "Emacs";
 768
 769   lp = member ("-n", arg_list);
 770   if (! NIL (lp))
 771     name = car (cdr (lp));
 772   else
 773     name = "emacs";
 774
 775   free_arglist (arg_list);
 776
 777   if (!(display = XOpenDisplay (displayname)))
 778     fatal ("Can't open display '%s'\n", XDisplayName (displayname));
 779
 780   xdb = x_load_resources (display, resource_string, name, class);
 781
 782   /* In a real program, you'd want to also do this: */
 783   display->db = xdb;
 784
 785   while (1)
 786     {
 787       char query_name[90];
 788       char query_class[90];
 789
 790       printf ("Name: ");
 791       gets (query_name);
 792
 793       if (strlen (query_name))
 794         {
 795           char *value;
 796
 797           printf ("Class: ");
 798           gets (query_class);
 799
 800           value = x_get_string_resource (xdb, query_name, query_class);
 801
 802           if (value != NULL)
 803             printf ("\t%s(%s):  %s\n\n", query_name, query_class, value);
 804           else
 805             printf ("\tNo Value.\n\n");
 806         }
 807       else
 808         break;
 809     }
 810   printf ("\tExit.\n\n");
 811
 812   XCloseDisplay (display);
 813 }
 814 #endif /* TESTRM */