src/xrdb.c

   1 /* Deal with the X Resource Manager.
   2    Copyright (C) 1990, 1993, 1994, 2000, 2001, 2002, 2003, 2004,
   3                  2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
   4
   5 Author: Joseph Arceneaux
   6 Created: 4/90
   7
   8 This file is part of GNU Emacs.
   9
  10 GNU Emacs is free software: you can redistribute it and/or modify
  11 it under the terms of the GNU General Public License as published by
  12 the Free Software Foundation, either version 3 of the License, or
  13 (at your option) any later version.
  14
  15 GNU Emacs is distributed in the hope that it will be useful,
  16 but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 GNU General Public License for more details.
  19
  20 You should have received a copy of the GNU General Public License
  21 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  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 #include <setjmp.h>
  35
  36 #if 1 /* I'd really appreciate it if this code could go away...  -JimB */
  37 /* This avoids lossage in the `dual-universe' headers on AT&T SysV
  38    X11.  Don't do it on Solaris, because it breaks compilation with
  39    XFree86 4.0.3 (and probably many other X11R6 releases) on Solaris
  40    2 */
  41 #if defined(USG5) && !defined(SOLARIS2)
  42 #ifndef SYSV
  43 #define SYSV
  44 #endif
  45 #endif /* USG5 && !SOLARIS2 */
  46
  47 #endif /* 1 */
  48
  49 #include <X11/Xlib.h>
  50 #include <X11/Xatom.h>
  51 #if 0
  52 #include <X11/Xos.h>
  53 #endif
  54 #include <X11/X.h>
  55 #include <X11/Xutil.h>
  56 #include <X11/Xresource.h>
  57 #ifdef HAVE_PWD_H
  58 #include <pwd.h>
  59 #endif
  60 #include <sys/stat.h>
  61
  62 #if !defined(S_ISDIR) && defined(S_IFDIR)
  63 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
  64 #endif
  65
  66 #include "lisp.h"
  67
  68 extern char *getenv ();
  69
  70 /* This does cause trouble on AIX.  I'm going to take the comment at
  71    face value.  */
  72 #if 0
  73 extern short getuid ();         /* If this causes portability problems,
  74                                    I think we should just delete it; it'll
  75                                    default to `int' anyway.  */
  76 #endif
  77
  78 #ifdef DECLARE_GETPWUID_WITH_UID_T
  79 extern struct passwd *getpwuid (uid_t);
  80 extern struct passwd *getpwnam (const char *);
  81 #else
  82 extern struct passwd *getpwuid ();
  83 extern struct passwd *getpwnam ();
  84 #endif
  85
  86 extern char *get_system_name ();
  87
  88 /* Make sure not to #include anything after these definitions.  Let's
  89    not step on anyone's prototypes.  */
  90 #ifdef emacs
  91 /* darwin.h may have already defined these.  */
  92 #undef malloc
  93 #undef realloc
  94 #undef free
  95 #define malloc xmalloc
  96 #define realloc xrealloc
  97 #define free xfree
  98 #endif
  99
 100 char *x_get_string_resource ();
 101 static int file_p ();
 102
 103 \f
 104 /* X file search path processing.  */
 105
 106
 107 /* The string which gets substituted for the %C escape in XFILESEARCHPATH
 108    and friends, or zero if none was specified.  */
 109 char *x_customization_string;
 110
 111
 112 /* Return the value of the emacs.customization (Emacs.Customization)
 113    resource, for later use in search path decoding.  If we find no
 114    such resource, return zero.  */
 115 char *
 116 x_get_customization_string (db, name, class)
 117      XrmDatabase db;
 118      char *name, *class;
 119 {
 120   char *full_name
 121     = (char *) alloca (strlen (name) + sizeof ("customization") + 3);
 122   char *full_class
 123     = (char *) alloca (strlen (class) + sizeof ("Customization") + 3);
 124   char *result;
 125
 126   sprintf (full_name,  "%s.%s", name,  "customization");
 127   sprintf (full_class, "%s.%s", class, "Customization");
 128
 129   result = x_get_string_resource (db, full_name, full_class);
 130
 131   if (result)
 132     {
 133       char *copy = (char *) malloc (strlen (result) + 1);
 134       strcpy (copy, result);
 135       return copy;
 136     }
 137   else
 138     return 0;
 139 }
 140
 141
 142 /* Expand all the Xt-style %-escapes in STRING, whose length is given
 143    by STRING_LEN.  Here are the escapes we're supposed to recognize:
 144
 145         %N      The value of the application's class name
 146         %T      The value of the type parameter ("app-defaults" in this
 147                 context)
 148         %S      The value of the suffix parameter ("" in this context)
 149         %L      The language string associated with the specified display
 150                 (We use the "LANG" environment variable here, if it's set.)
 151         %l      The language part of the display's language string
 152                 (We treat this just like %L.  If someone can tell us what
 153                  we're really supposed to do, dandy.)
 154         %t      The territory part of the display's language string
 155                 (This never gets used.)
 156         %c      The codeset part of the display's language string
 157                 (This never gets used either.)
 158         %C      The customization string retrieved from the resource
 159                 database associated with display.
 160                 (This is x_customization_string.)
 161
 162    Return the expanded file name if it exists and is readable, and
 163    refers to %L only when the LANG environment variable is set, or
 164    otherwise provided by X.
 165
 166    ESCAPED_SUFFIX and SUFFIX are postpended to STRING if they are
 167    non-zero.  %-escapes in ESCAPED_SUFFIX are expanded; STRING is left
 168    alone.
 169
 170    Return NULL otherwise.  */
 171
 172 static char *
 173 magic_file_p (string, string_len, class, escaped_suffix, suffix)
 174      char *string;
 175      int string_len;
 176      char *class, *escaped_suffix, *suffix;
 177 {
 178   char *lang = getenv ("LANG");
 179
 180   int path_size = 100;
 181   char *path = (char *) malloc (path_size);
 182   int path_len = 0;
 183
 184   char *p = string;
 185
 186   while (p < string + string_len)
 187     {
 188       /* The chunk we're about to stick on the end of result.  */
 189       char *next = NULL;
 190       int next_len;
 191
 192       if (*p == '%')
 193         {
 194           p++;
 195
 196           if (p >= string + string_len)
 197             next_len = 0;
 198           else
 199             switch (*p)
 200               {
 201               case '%':
 202                 next = "%";
 203                 next_len = 1;
 204                 break;
 205
 206               case 'C':
 207                 next = (x_customization_string
 208                         ? x_customization_string
 209                         : "");
 210                 next_len = strlen (next);
 211                 break;
 212
 213               case 'N':
 214                 next = class;
 215                 next_len = strlen (class);
 216                 break;
 217
 218               case 'T':
 219                 next = "app-defaults";
 220                 next_len = strlen (next);
 221                 break;
 222
 223               default:
 224               case 'S':
 225                 next_len = 0;
 226                 break;
 227
 228               case 'L':
 229               case 'l':
 230                 if (! lang)
 231                   {
 232                     free (path);
 233                     return NULL;
 234                   }
 235
 236                 next = lang;
 237                 next_len = strlen (next);
 238                 break;
 239
 240               case 't':
 241               case 'c':
 242                 free (path);
 243                 return NULL;
 244               }
 245         }
 246       else
 247         next = p, next_len = 1;
 248
 249       /* Do we have room for this component followed by a '\0' ?  */
 250       if (path_len + next_len + 1 > path_size)
 251         {
 252           path_size = (path_len + next_len + 1) * 2;
 253           path = (char *) realloc (path, path_size);
 254         }
 255
 256       bcopy (next, path + path_len, next_len);
 257       path_len += next_len;
 258
 259       p++;
 260
 261       /* If we've reached the end of the string, append ESCAPED_SUFFIX.  */
 262       if (p >= string + string_len && escaped_suffix)
 263         {
 264           string = escaped_suffix;
 265           string_len = strlen (string);
 266           p = string;
 267           escaped_suffix = NULL;
 268         }
 269     }
 270
 271   /* Perhaps we should add the SUFFIX now.  */
 272   if (suffix)
 273     {
 274       int suffix_len = strlen (suffix);
 275
 276       if (path_len + suffix_len + 1 > path_size)
 277         {
 278           path_size = (path_len + suffix_len + 1);
 279           path = (char *) realloc (path, path_size);
 280         }
 281
 282       bcopy (suffix, path + path_len, suffix_len);
 283       path_len += suffix_len;
 284     }
 285
 286   path[path_len] = '\0';
 287
 288   if (! file_p (path))
 289     {
 290       free (path);
 291       return NULL;
 292     }
 293
 294   return path;
 295 }
 296
 297
 298 static char *
 299 gethomedir ()
 300 {
 301   struct passwd *pw;
 302   char *ptr;
 303   char *copy;
 304
 305   if ((ptr = getenv ("HOME")) == NULL)
 306     {
 307       if ((ptr = getenv ("LOGNAME")) != NULL
 308           || (ptr = getenv ("USER")) != NULL)
 309         pw = getpwnam (ptr);
 310       else
 311         pw = getpwuid (getuid ());
 312
 313       if (pw)
 314         ptr = pw->pw_dir;
 315     }
 316
 317   if (ptr == NULL)
 318     return xstrdup ("/");
 319
 320   copy = (char *) malloc (strlen (ptr) + 2);
 321   strcpy (copy, ptr);
 322   strcat (copy, "/");
 323
 324   return copy;
 325 }
 326
 327
 328 static int
 329 file_p (filename)
 330      char *filename;
 331 {
 332   struct stat status;
 333
 334   return (access (filename, 4) == 0             /* exists and is readable */
 335           && stat (filename, &status) == 0      /* get the status */
 336           && (S_ISDIR (status.st_mode)) == 0);  /* not a directory */
 337 }
 338
 339
 340 /* Find the first element of SEARCH_PATH which exists and is readable,
 341    after expanding the %-escapes.  Return 0 if we didn't find any, and
 342    the path name of the one we found otherwise.  */
 343
 344 static char *
 345 search_magic_path (search_path, class, escaped_suffix, suffix)
 346      char *search_path, *class, *escaped_suffix, *suffix;
 347 {
 348   register char *s, *p;
 349
 350   for (s = search_path; *s; s = p)
 351     {
 352       for (p = s; *p && *p != ':'; p++)
 353         ;
 354
 355       if (p > s)
 356         {
 357           char *path = magic_file_p (s, p - s, class, escaped_suffix, suffix);
 358           if (path)
 359             return path;
 360         }
 361       else if (*p == ':')
 362         {
 363           char *path;
 364
 365           s = "%N%S";
 366           path = magic_file_p (s, strlen (s), class, escaped_suffix, suffix);
 367           if (path)
 368             return path;
 369         }
 370
 371       if (*p == ':')
 372         p++;
 373     }
 374
 375   return 0;
 376 }
 377 \f
 378 /* Producing databases for individual sources.  */
 379
 380 static XrmDatabase
 381 get_system_app (class)
 382      char *class;
 383 {
 384   XrmDatabase db = NULL;
 385   char *path;
 386
 387   path = getenv ("XFILESEARCHPATH");
 388   if (! path) path = PATH_X_DEFAULTS;
 389
 390   path = search_magic_path (path, class, 0, 0);
 391   if (path)
 392     {
 393       db = XrmGetFileDatabase (path);
 394       free (path);
 395     }
 396
 397   return db;
 398 }
 399
 400
 401 static XrmDatabase
 402 get_fallback (display)
 403      Display *display;
 404 {
 405   return NULL;
 406 }
 407
 408
 409 static XrmDatabase
 410 get_user_app (class)
 411      char *class;
 412 {
 413   char *path;
 414   char *file = 0;
 415   char *free_it = 0;
 416
 417   /* Check for XUSERFILESEARCHPATH.  It is a path of complete file
 418      names, not directories.  */
 419   if (((path = getenv ("XUSERFILESEARCHPATH"))
 420        && (file = search_magic_path (path, class, 0, 0)))
 421
 422       /* Check for APPLRESDIR; it is a path of directories.  In each,
 423          we have to search for LANG/CLASS and then CLASS.  */
 424       || ((path = getenv ("XAPPLRESDIR"))
 425           && ((file = search_magic_path (path, class, "/%L/%N", 0))
 426               || (file = search_magic_path (path, class, "/%N", 0))))
 427
 428       /* Check in the home directory.  This is a bit of a hack; let's
 429          hope one's home directory doesn't contain any %-escapes.  */
 430       || (free_it = gethomedir (),
 431           ((file = search_magic_path (free_it, class, "%L/%N", 0))
 432            || (file = search_magic_path (free_it, class, "%N", 0)))))
 433     {
 434       XrmDatabase db = XrmGetFileDatabase (file);
 435       free (file);
 436       free (free_it);
 437       return db;
 438     }
 439
 440   free (free_it);
 441   return NULL;
 442 }
 443
 444
 445 static XrmDatabase
 446 get_user_db (display)
 447      Display *display;
 448 {
 449   XrmDatabase db;
 450   char *xdefs;
 451
 452 #ifdef PBaseSize                /* Cheap way to test for X11R4 or later.  */
 453   xdefs = XResourceManagerString (display);
 454 #else
 455   xdefs = display->xdefaults;
 456 #endif
 457
 458   if (xdefs != NULL)
 459     db = XrmGetStringDatabase (xdefs);
 460   else
 461     {
 462       char *home;
 463       char *xdefault;
 464
 465       home = gethomedir ();
 466       xdefault = (char *) malloc (strlen (home) + sizeof (".Xdefaults"));
 467       strcpy (xdefault, home);
 468       strcat (xdefault, ".Xdefaults");
 469       db = XrmGetFileDatabase (xdefault);
 470       free (home);
 471       free (xdefault);
 472     }
 473
 474 #ifdef HAVE_XSCREENRESOURCESTRING
 475   /* Get the screen-specific resources too.  */
 476   xdefs = XScreenResourceString (DefaultScreenOfDisplay (display));
 477   if (xdefs != NULL)
 478     {
 479       XrmMergeDatabases (XrmGetStringDatabase (xdefs), &db);
 480       XFree (xdefs);
 481     }
 482 #endif
 483
 484   return db;
 485 }
 486
 487 static XrmDatabase
 488 get_environ_db ()
 489 {
 490   XrmDatabase db;
 491   char *p;
 492   char *path = 0, *home = 0, *host;
 493
 494   if ((p = getenv ("XENVIRONMENT")) == NULL)
 495     {
 496       home = gethomedir ();
 497       host = get_system_name ();
 498       path = (char *) malloc (strlen (home)
 499                               + sizeof (".Xdefaults-")
 500                               + strlen (host));
 501       sprintf (path, "%s%s%s", home, ".Xdefaults-", host);
 502       p = path;
 503     }
 504
 505   db = XrmGetFileDatabase (p);
 506
 507   free (path);
 508   free (home);
 509
 510   return db;
 511 }
 512 \f
 513 /* External interface.  */
 514
 515 /* Types of values that we can find in a database */
 516
 517 #define XrmStringType "String"  /* String representation */
 518 XrmRepresentation x_rm_string;  /* Quark representation */
 519
 520 /* Load X resources based on the display and a possible -xrm option. */
 521
 522 XrmDatabase
 523 x_load_resources (display, xrm_string, myname, myclass)
 524      Display *display;
 525      char *xrm_string, *myname, *myclass;
 526 {
 527   XrmDatabase user_database;
 528   XrmDatabase rdb;
 529   XrmDatabase db;
 530   char line[256];
 531
 532   char *helv = "-*-helvetica-medium-r-*--*-120-*-*-*-*-iso8859-1";
 533
 534 #ifdef USE_MOTIF
 535   char *courier = "-*-courier-medium-r-*-*-*-120-*-*-*-*-iso8859-1";
 536   extern Lisp_Object Vdouble_click_time;
 537 #endif
 538
 539   x_rm_string = XrmStringToQuark (XrmStringType);
 540 #ifndef USE_X_TOOLKIT
 541   /* pmr@osf.org says this shouldn't be done if USE_X_TOOLKIT.
 542      I suspect it's because the toolkit version does this elsewhere.  */
 543   XrmInitialize ();
 544 #endif
 545   rdb = XrmGetStringDatabase ("");
 546
 547   /* Add some font defaults.  If the font `helv' doesn't exist, widgets
 548      will use some other default font.  */
 549 #ifdef USE_MOTIF
 550
 551   sprintf (line, "%s.pane.background: grey75", myclass);
 552   XrmPutLineResource (&rdb, line);
 553   sprintf (line, "%s*fontList: %s", myclass, helv);
 554   XrmPutLineResource (&rdb, line);
 555   sprintf (line, "%s*menu*background: grey75", myclass);
 556   XrmPutLineResource (&rdb, line);
 557   sprintf (line, "%s*menubar*background: grey75", myclass);
 558   XrmPutLineResource (&rdb, line);
 559   sprintf (line, "%s*verticalScrollBar.background: grey75", myclass);
 560   XrmPutLineResource (&rdb, line);
 561   sprintf (line, "%s*verticalScrollBar.troughColor: grey75", myclass);
 562   XrmPutLineResource (&rdb, line);
 563   sprintf (line, "%s.dialog*.background: grey75", myclass);
 564   XrmPutLineResource (&rdb, line);
 565   sprintf (line, "%s*fsb.Text.background: white", myclass);
 566   XrmPutLineResource (&rdb, line);
 567   sprintf (line, "%s*fsb.FilterText.background: white", myclass);
 568   XrmPutLineResource (&rdb, line);
 569   sprintf (line, "%s*fsb*DirList.background: white", myclass);
 570   XrmPutLineResource (&rdb, line);
 571   sprintf (line, "%s*fsb*ItemsList.background: white", myclass);
 572   XrmPutLineResource (&rdb, line);
 573   sprintf (line, "%s*fsb*background: grey75", myclass);
 574   XrmPutLineResource (&rdb, line);
 575   sprintf (line, "%s*fsb.Text.fontList: %s", myclass, courier);
 576   XrmPutLineResource (&rdb, line);
 577   sprintf (line, "%s*fsb.FilterText.fontList: %s", myclass, courier);
 578   XrmPutLineResource (&rdb, line);
 579   sprintf (line, "%s*fsb*ItemsList.fontList: %s", myclass, courier);
 580   XrmPutLineResource (&rdb, line);
 581   sprintf (line, "%s*fsb*DirList.fontList: %s", myclass, courier);
 582   XrmPutLineResource (&rdb, line);
 583
 584   /* Set double click time of list boxes in the file selection
 585      dialog from `double-click-time'.  */
 586   if (INTEGERP (Vdouble_click_time) && XINT (Vdouble_click_time) > 0)
 587     {
 588       sprintf (line, "%s*fsb*DirList.doubleClickInterval: %d",
 589                myclass, XFASTINT (Vdouble_click_time));
 590       XrmPutLineResource (&rdb, line);
 591       sprintf (line, "%s*fsb*ItemsList.doubleClickInterval: %d",
 592                myclass, XFASTINT (Vdouble_click_time));
 593       XrmPutLineResource (&rdb, line);
 594     }
 595
 596 #else /* not USE_MOTIF */
 597
 598   sprintf (line, "Emacs.dialog*.font: %s", helv);
 599   XrmPutLineResource (&rdb, line);
 600   sprintf (line, "Emacs.dialog*.background: grey75");
 601   XrmPutLineResource (&rdb, line);
 602   sprintf (line, "*XlwMenu*font: %s", helv);
 603   XrmPutLineResource (&rdb, line);
 604   sprintf (line, "*XlwMenu*background: grey75");
 605   XrmPutLineResource (&rdb, line);
 606   sprintf (line, "Emacs*verticalScrollBar.background: grey75");
 607   XrmPutLineResource (&rdb, line);
 608
 609 #endif /* not USE_MOTIF */
 610
 611   user_database = get_user_db (display);
 612
 613   /* Figure out what the "customization string" is, so we can use it
 614      to decode paths.  */
 615   free (x_customization_string);
 616   x_customization_string
 617     = x_get_customization_string (user_database, myname, myclass);
 618
 619   /* Get application system defaults */
 620   db = get_system_app (myclass);
 621   if (db != NULL)
 622     XrmMergeDatabases (db, &rdb);
 623
 624   /* Get Fallback resources */
 625   db = get_fallback (display);
 626   if (db != NULL)
 627     XrmMergeDatabases (db, &rdb);
 628
 629   /* Get application user defaults */
 630   db = get_user_app (myclass);
 631   if (db != NULL)
 632     XrmMergeDatabases (db, &rdb);
 633
 634   /* get User defaults */
 635   if (user_database != NULL)
 636     XrmMergeDatabases (user_database, &rdb);
 637
 638   /* Get Environment defaults. */
 639   db = get_environ_db ();
 640   if (db != NULL)
 641     XrmMergeDatabases (db, &rdb);
 642
 643   /* Last, merge in any specification from the command line. */
 644   if (xrm_string != NULL)
 645     {
 646       db = XrmGetStringDatabase (xrm_string);
 647       if (db != NULL)
 648         XrmMergeDatabases (db, &rdb);
 649     }
 650
 651   return rdb;
 652 }
 653
 654
 655 /* Retrieve the value of the resource specified by NAME with class CLASS
 656    and of type TYPE from database RDB.  The value is returned in RET_VALUE. */
 657
 658 int
 659 x_get_resource (rdb, name, class, expected_type, ret_value)
 660      XrmDatabase rdb;
 661      char *name, *class;
 662      XrmRepresentation expected_type;
 663      XrmValue *ret_value;
 664 {
 665   XrmValue value;
 666   XrmName namelist[100];
 667   XrmClass classlist[100];
 668   XrmRepresentation type;
 669
 670   XrmStringToNameList(name, namelist);
 671   XrmStringToClassList(class, classlist);
 672
 673   if (XrmQGetResource (rdb, namelist, classlist, &type, &value) == True
 674       && (type == expected_type))
 675     {
 676       if (type == x_rm_string)
 677         ret_value->addr = (char *) value.addr;
 678       else
 679         bcopy (value.addr, ret_value->addr, ret_value->size);
 680
 681       return value.size;
 682     }
 683
 684   return 0;
 685 }
 686
 687 /* Retrieve the string resource specified by NAME with CLASS from
 688    database RDB. */
 689
 690 char *
 691 x_get_string_resource (rdb, name, class)
 692      XrmDatabase rdb;
 693      char *name, *class;
 694 {
 695   XrmValue value;
 696
 697   if (inhibit_x_resources)
 698     /* --quick was passed, so this is a no-op.  */
 699     return NULL;
 700
 701   if (x_get_resource (rdb, name, class, x_rm_string, &value))
 702     return (char *) value.addr;
 703
 704   return (char *) 0;
 705 }
 706 \f
 707 /* Stand-alone test facilities.  */
 708
 709 #ifdef TESTRM
 710
 711 typedef char **List;
 712 #define arg_listify(len, list) (list)
 713 #define car(list) (*(list))
 714 #define cdr(list) (list + 1)
 715 #define NIL(list) (! *(list))
 716 #define free_arglist(list)
 717
 718 static List
 719 member (elt, list)
 720      char *elt;
 721      List list;
 722 {
 723   List p;
 724
 725   for (p = list; ! NIL (p); p = cdr (p))
 726     if (! strcmp (elt, car (p)))
 727       return p;
 728
 729   return p;
 730 }
 731
 732 static void
 733 fatal (msg, prog, x1, x2, x3, x4, x5)
 734     char *msg, *prog;
 735     int x1, x2, x3, x4, x5;
 736 {
 737     extern int errno;
 738
 739     if (errno)
 740       perror (prog);
 741
 742     (void) fprintf (stderr, msg, prog, x1, x2, x3, x4, x5);
 743     exit (1);
 744 }
 745
 746 main (argc, argv)
 747     int argc;
 748     char **argv;
 749 {
 750   Display *display;
 751   char *displayname, *resource_string, *class, *name;
 752   XrmDatabase xdb;
 753   List arg_list, lp;
 754
 755   arg_list = arg_listify (argc, argv);
 756
 757   lp = member ("-d", arg_list);
 758   if (!NIL (lp))
 759     displayname = car (cdr (lp));
 760   else
 761     displayname = "localhost:0.0";
 762
 763   lp = member ("-xrm", arg_list);
 764   if (! NIL (lp))
 765     resource_string = car (cdr (lp));
 766   else
 767     resource_string = (char *) 0;
 768
 769   lp = member ("-c", arg_list);
 770   if (! NIL (lp))
 771     class = car (cdr (lp));
 772   else
 773     class = "Emacs";
 774
 775   lp = member ("-n", arg_list);
 776   if (! NIL (lp))
 777     name = car (cdr (lp));
 778   else
 779     name = "emacs";
 780
 781   free_arglist (arg_list);
 782
 783   if (!(display = XOpenDisplay (displayname)))
 784     fatal ("Can't open display '%s'\n", XDisplayName (displayname));
 785
 786   xdb = x_load_resources (display, resource_string, name, class);
 787
 788   /* In a real program, you'd want to also do this: */
 789   display->db = xdb;
 790
 791   while (1)
 792     {
 793       char query_name[90];
 794       char query_class[90];
 795
 796       printf ("Name: ");
 797       gets (query_name);
 798
 799       if (strlen (query_name))
 800         {
 801           char *value;
 802
 803           printf ("Class: ");
 804           gets (query_class);
 805
 806           value = x_get_string_resource (xdb, query_name, query_class);
 807
 808           if (value != NULL)
 809             printf ("\t%s(%s):  %s\n\n", query_name, query_class, value);
 810           else
 811             printf ("\tNo Value.\n\n");
 812         }
 813       else
 814         break;
 815     }
 816   printf ("\tExit.\n\n");
 817
 818   XCloseDisplay (display);
 819 }
 820 #endif /* TESTRM */
 821
 822 /* arch-tag: 37e6fbab-ed05-4363-9e76-6c4109ed511f
 823    (do not change this comment) */