src/xrdb.c

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