code.delx.au - gnu-emacs/blob - src/xrdb.c

   1 /* Deal with the X Resource Manager.
   2    Copyright (C) 1990 Free Software Foundation.
   3
   4 This program is free software; you can redistribute it and/or modify
   5 it under the terms of the GNU General Public License as published by
   6 the Free Software Foundation; either version 1, or (at your option)
   7 any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program; see the file COPYING.  If not, write to
  16 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  17
  18 /* Written by jla, 4/90 */
  19
  20 #include <X11/Xlib.h>
  21 #include <X11/Xatom.h>
  22 #include <X11/Xos.h>
  23 #include <X11/X.h>
  24 #include <X11/Xutil.h>
  25 #include <X11/Xresource.h>
  26 #include <sys/param.h>
  27 #ifdef VMS
  28 #include "vms-pwd.h"
  29 #else
  30 #include <pwd.h>
  31 #endif
  32 #include <sys/stat.h>
  33 #include <sys/types.h>
  34
  35 #ifdef emacs
  36 #include "config.h"
  37 #endif
  38
  39 extern char *getenv ();
  40 extern uid_t getuid ();
  41 extern struct passwd *getpwuid ();
  42 extern struct passwd *getpwnam ();
  43
  44 static char *
  45 gethomedir (dirname)
  46      char *dirname;
  47 {
  48   int uid;
  49   struct passwd *pw;
  50   char *ptr;
  51
  52   if ((ptr = getenv ("HOME")) == NULL)
  53     {
  54       if ((ptr = getenv ("USER")) != NULL)
  55         pw = getpwnam (ptr);
  56       else
  57         {
  58           uid = getuid ();
  59           pw = getpwuid (uid);
  60         }
  61       if (pw)
  62         ptr = pw->pw_dir;
  63       else
  64         {
  65           ptr = NULL;
  66           *dirname = '\0';
  67         }
  68     }
  69
  70   if (ptr != NULL)
  71     strcpy (dirname, ptr);
  72
  73   dirname += strlen (dirname);
  74   *dirname = '/';
  75   dirname++;
  76   *dirname = '\0';
  77
  78   return dirname;
  79 }
  80
  81 static int
  82 file_p (path)
  83      char *path;
  84 {
  85   struct stat status;
  86
  87   return (access (path, R_OK) == 0              /* exists and is readable */
  88           && stat (path, &status) == 0          /* get the status */
  89           && (status.st_mode & S_IFDIR) == 0);  /* not a directory */
  90 }
  91
  92 #if 0
  93 #define X_DEFAULT_SEARCH_PATH "/usr/lib/X11/"
  94 #endif
  95
  96 /* Isn't this just disgusting? */
  97
  98 #define X_DEFAULT_SEARCH_PATH "/usr/lib/X11/%L/%T/%N%S:/usr/lib/X11/%l/%T/%N%S:/usr/lib/X11/%T/%N%S"
  99
 100 static int
 101 decode_magic (string, file, return_path)
 102      char *string, *file, *return_path;
 103 {
 104   char *p = string;
 105   char *t = return_path;
 106
 107   while (*p)
 108     {
 109       if (*p == '%')
 110         switch (*++p)
 111           {
 112           case '%':
 113             *t++ = '%';
 114             p++;
 115             break;
 116
 117           case 'N':
 118           case 'T':
 119           case 'S':
 120           case 'L':
 121           case 'l':
 122           case 't':
 123           case 'c':
 124           default:
 125             p++;
 126             if (*t == '/' && *p == '/')
 127               p++;
 128             break;
 129           }
 130       else
 131         *t++ = *p++;
 132     }
 133   *t = '\0';
 134   strcat (return_path, file);
 135
 136   if (file_p (return_path))
 137     return 1;
 138
 139   return_path[0] = '\0';
 140   return 0;
 141 }
 142
 143 static int
 144 magic_searchpath_decoder (incantation_string, file, return_path)
 145      char *incantation_string, *return_path, *file;
 146 {
 147   register char *s = incantation_string;
 148   register char *p;
 149   register char string[MAXPATHLEN];
 150
 151   while (*s)
 152     {
 153       p = s;
 154
 155       while (*p && *p != ':')
 156         p++;
 157
 158       if (*p == ':' && *(p + 1) == ':')
 159         {
 160           bcopy ("%N%S", string, 5);
 161           if (decode_magic (string, file, return_path))
 162             return 1;
 163
 164           s = p + 1;
 165           continue;
 166         }
 167
 168       if (p > s)
 169         {
 170           int len = p - s;
 171
 172           bcopy (s, string, len);
 173           string[len + 1] = '\0';
 174           if (decode_magic (string, file, return_path))
 175             return 1;
 176         }
 177
 178       if (p)
 179         s = p + 1;
 180       else
 181         return 0;
 182     }
 183
 184   return 0;
 185 }
 186 \f
 187 static XrmDatabase
 188 get_system_app (class)
 189      char *class;
 190 {
 191   XrmDatabase db;
 192   char path[MAXPATHLEN];
 193   char *p;
 194
 195   if ((p = getenv ("XFILESEARCHPATH")) == NULL)
 196     p = X_DEFAULT_SEARCH_PATH;
 197
 198   if (! magic_searchpath_decoder (p, class, path))
 199     return NULL;
 200
 201   db = XrmGetFileDatabase (path);
 202   return db;
 203 }
 204
 205 static XrmDatabase
 206 get_fallback (display)
 207      Display *display;
 208 {
 209   XrmDatabase db;
 210
 211   return NULL;
 212 }
 213
 214 static XrmDatabase
 215 get_user_app (class)
 216      char *class;
 217 {
 218   XrmDatabase db;
 219   char *magic_path;
 220   char path[MAXPATHLEN];
 221
 222   if ((magic_path = getenv ("XUSERFILESEARCHPATH")) == NULL)
 223     {
 224       char homedir[MAXPATHLEN];
 225       char *default_magic;
 226       char *p;
 227
 228       gethomedir (homedir);
 229
 230       if ((p = getenv ("XAPPLRESDIR")) == NULL)
 231         {
 232           default_magic = "%s/%%L/%%N:%s/%%l/%%N:%s/%%N";
 233           magic_path = (char *) alloca ((3 * strlen (homedir))
 234                                         + strlen (default_magic));
 235           sprintf (magic_path, default_magic, homedir, homedir, homedir);
 236         }
 237       else
 238         {
 239           default_magic = "%s/%%L/%%N:%s/%%l/%%N:%s/%%N:%s/%%N";
 240           magic_path = (char *) alloca ((3 * strlen (p))
 241                                         + strlen (default_magic)
 242                                         + strlen (homedir));
 243           sprintf (magic_path, default_magic, p, p, p, homedir);
 244         }
 245     }
 246
 247   if (! magic_searchpath_decoder (magic_path, class, path))
 248     return NULL;
 249
 250   db = XrmGetFileDatabase (path);
 251   return db;
 252 }
 253
 254 static XrmDatabase
 255 get_user_db (display)
 256      Display *display;
 257 {
 258   XrmDatabase db;
 259   char *xdefs;
 260
 261   xdefs = XResourceManagerString (display);
 262   if (xdefs != NULL)
 263     db = XrmGetStringDatabase (xdefs);
 264   else
 265     {
 266       char xdefault[MAXPATHLEN];
 267
 268       gethomedir (xdefault);
 269       strcat (xdefault, ".Xdefaults");
 270       db = XrmGetFileDatabase (xdefault);
 271     }
 272
 273   return db;
 274 }
 275
 276 static XrmDatabase
 277 get_environ_db ()
 278 {
 279   XrmDatabase db;
 280   char *p;
 281   char path[MAXPATHLEN];
 282
 283   if ((p = getenv ("XENVIRONMENT")) == NULL)
 284     {
 285       gethomedir (path);
 286       strcat (path, ".Xdefaults-");
 287       gethostname (path + strlen (path), MAXPATHLEN - strlen (path));
 288       p = path;
 289     }
 290
 291   db = XrmGetFileDatabase (p);
 292   return db;
 293 }
 294 \f
 295 /* Types of values that we can find in a database */
 296
 297 #define XrmStringType "String"  /* String representation */
 298 XrmRepresentation x_rm_string;  /* Quark representation */
 299
 300 /* Load X resources based on the display and a possible -xrm option. */
 301
 302 XrmDatabase
 303 x_load_resources (display, xrm_string, myclass)
 304      Display *display;
 305      char *xrm_string, *myclass;
 306 {
 307   char *xdefs;
 308   XrmDatabase rdb;
 309   XrmDatabase db;
 310
 311   x_rm_string = XrmStringToQuark (XrmStringType);
 312   XrmInitialize ();
 313   rdb = XrmGetStringDatabase ("");
 314
 315   /* Get application system defaults */
 316   db = get_system_app (myclass);
 317   if (db != NULL)
 318     XrmMergeDatabases (db, &rdb);
 319
 320   /* Get Fallback resources */
 321   db = get_fallback (display);
 322   if (db != NULL)
 323     XrmMergeDatabases (db, &rdb);
 324
 325   /* Get application user defaults */
 326   db = get_user_app (myclass);
 327   if (db != NULL)
 328     XrmMergeDatabases (db, &rdb);
 329
 330   /* get User defaults */
 331   db = get_user_db (display);
 332   if (db != NULL)
 333     XrmMergeDatabases (db, &rdb);
 334
 335   /* Get Environment defaults. */
 336   db = get_environ_db ();
 337   if (db != NULL)
 338     XrmMergeDatabases (db, &rdb);
 339
 340   /* Last, merge in any specification from the command line. */
 341   if (xrm_string != NULL)
 342     {
 343       db = XrmGetStringDatabase (xrm_string);
 344       if (db != NULL)
 345         XrmMergeDatabases (db, &rdb);
 346     }
 347
 348   return rdb;
 349 }
 350
 351 /* Retrieve the value of the resource specified by NAME with class CLASS
 352    and of type TYPE from database RDB.  The value is returned in RET_VALUE. */
 353
 354 int
 355 x_get_resource (rdb, name, class, expected_type, ret_value)
 356      XrmDatabase rdb;
 357      char *name, *class;
 358      XrmRepresentation expected_type;
 359      XrmValue *ret_value;
 360 {
 361   XrmValue value;
 362   XrmName namelist[100];
 363   XrmClass classlist[100];
 364   XrmRepresentation type;
 365
 366   XrmStringToNameList(name, namelist);
 367   XrmStringToClassList(class, classlist);
 368
 369   if (XrmQGetResource (rdb, namelist, classlist, &type, &value) == True
 370       && (type == expected_type))
 371     {
 372       if (type == x_rm_string)
 373         (char *) ret_value->addr = value.addr;
 374       else
 375         bcopy (value.addr, ret_value->addr, ret_value->size);
 376
 377       return value.size;
 378     }
 379
 380   return 0;
 381 }
 382
 383 /* Retrieve the string resource specified by NAME with CLASS from
 384    database RDB. */
 385
 386 char *
 387 x_get_string_resource (rdb, name, class)
 388      XrmDatabase rdb;
 389      char *name, *class;
 390 {
 391   XrmValue value;
 392
 393   if (x_get_resource (rdb, name, class, x_rm_string, &value))
 394     return (char *) value.addr;
 395
 396   return (char *) 0;
 397 }
 398 \f
 399 #ifdef TESTRM
 400 #include <stdio.h>
 401 #include "arg-list.h"
 402
 403 static void
 404 fatal (msg, prog, x1, x2, x3, x4, x5)
 405     char *msg, *prog;
 406     int x1, x2, x3, x4, x5;
 407 {
 408     extern int errno;
 409
 410     if (errno)
 411       perror (prog);
 412
 413     (void) fprintf (stderr, msg, prog, x1, x2, x3, x4, x5);
 414     exit (1);
 415 }
 416
 417 main (argc, argv)
 418     int argc;
 419     char **argv;
 420 {
 421   Display *display;
 422   char *displayname, *resource_string, *class;
 423   XrmDatabase xdb;
 424   List *arg_list, *lp;
 425
 426   arg_list = arg_listify (argc, argv);
 427
 428   lp = member ("-d", arg_list);
 429   if (!NIL (lp))
 430     displayname = car (cdr (lp));
 431   else
 432     displayname = "localhost:0.0";
 433
 434   lp = member ("-xrm", arg_list);
 435   if (! NIL (lp))
 436     resource_string = car (cdr (lp));
 437   else
 438     resource_string = (char *) 0;
 439
 440   lp = member ("-c", arg_list);
 441   if (! NIL (lp))
 442     class = car (cdr (lp));
 443   else
 444     class = "Emacs";
 445
 446   free_arglist (arg_list);
 447
 448
 449
 450   if (!(display = XOpenDisplay (displayname)))
 451     fatal ("Can't open display '%s'\n", XDisplayName (displayname));
 452
 453   xdb = x_load_resources (display, resource_string, class);
 454
 455 #if 0
 456   /* In a real program, you'd want to also do this: */
 457   display->db = xdb;
 458 #endif
 459
 460   while (1)
 461     {
 462       char line[90];
 463
 464       printf ("String: ");
 465       gets (line);
 466       if (strlen (line))
 467         {
 468           char *value = x_get_string_resource (xdb, line, class);
 469
 470           if (value != NULL)
 471             printf ("\t%s:  %s\n\n", line, value);
 472           else
 473             printf ("\tNo Value.\n\n");
 474         }
 475       else
 476         break;
 477     }
 478   printf ("\tExit.\n\n");
 479
 480   XCloseDisplay (display);
 481 }
 482 #endif /* TESTRM */