Better seed support for (random).
[emacs.git] / src / xrdb.c
blob624bafa5e928b4a73872b53cfedc0a37ef85ea1d
1 /* Deal with the X Resource Manager.
2 Copyright (C) 1990, 1993-1994, 2000-2012 Free Software Foundation, Inc.
4 Author: Joseph Arceneaux
5 Created: 4/90
7 This file is part of GNU Emacs.
9 GNU Emacs is free software: you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation, either version 3 of the License, or
12 (at your option) any later version.
14 GNU Emacs is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
22 #include <config.h>
24 #include <unistd.h>
25 #include <errno.h>
26 #include <epaths.h>
28 #include <stdio.h>
29 #include <setjmp.h>
31 #include "lisp.h"
33 /* This may include sys/types.h, and that somehow loses
34 if this is not done before the other system files. */
35 #include "xterm.h"
37 #include <X11/Xlib.h>
38 #include <X11/Xatom.h>
39 #include <X11/X.h>
40 #include <X11/Xutil.h>
41 #include <X11/Xresource.h>
42 #ifdef HAVE_PWD_H
43 #include <pwd.h>
44 #endif
45 #include <sys/stat.h>
47 #ifdef USE_MOTIF
48 /* For Vdouble_click_time. */
49 #include "keyboard.h"
50 #endif
52 extern char *getenv (const char *);
54 extern struct passwd *getpwuid (uid_t);
55 extern struct passwd *getpwnam (const char *);
57 char *x_get_string_resource (XrmDatabase rdb, const char *name,
58 const char *class);
59 static int file_p (const char *filename);
62 /* X file search path processing. */
65 /* The string which gets substituted for the %C escape in XFILESEARCHPATH
66 and friends, or zero if none was specified. */
67 static char *x_customization_string;
70 /* Return the value of the emacs.customization (Emacs.Customization)
71 resource, for later use in search path decoding. If we find no
72 such resource, return zero. */
73 static char *
74 x_get_customization_string (XrmDatabase db, const char *name,
75 const char *class)
77 char *full_name = alloca (strlen (name) + sizeof "customization" + 3);
78 char *full_class = alloca (strlen (class) + sizeof "Customization" + 3);
79 char *result;
81 sprintf (full_name, "%s.%s", name, "customization");
82 sprintf (full_class, "%s.%s", class, "Customization");
84 result = x_get_string_resource (db, full_name, full_class);
86 if (result)
88 char *copy = xmalloc (strlen (result) + 1);
89 strcpy (copy, result);
90 return copy;
92 else
93 return 0;
97 /* Expand all the Xt-style %-escapes in STRING, whose length is given
98 by STRING_LEN. Here are the escapes we're supposed to recognize:
100 %N The value of the application's class name
101 %T The value of the type parameter ("app-defaults" in this
102 context)
103 %S The value of the suffix parameter ("" in this context)
104 %L The language string associated with the specified display
105 (We use the "LANG" environment variable here, if it's set.)
106 %l The language part of the display's language string
107 (We treat this just like %L. If someone can tell us what
108 we're really supposed to do, dandy.)
109 %t The territory part of the display's language string
110 (This never gets used.)
111 %c The codeset part of the display's language string
112 (This never gets used either.)
113 %C The customization string retrieved from the resource
114 database associated with display.
115 (This is x_customization_string.)
117 Return the expanded file name if it exists and is readable, and
118 refers to %L only when the LANG environment variable is set, or
119 otherwise provided by X.
121 ESCAPED_SUFFIX is postpended to STRING if it is non-zero.
122 %-escapes in ESCAPED_SUFFIX are expanded.
124 Return NULL otherwise. */
126 static char *
127 magic_file_p (const char *string, ptrdiff_t string_len, const char *class,
128 const char *escaped_suffix)
130 char *lang = getenv ("LANG");
132 ptrdiff_t path_size = 100;
133 char *path = xmalloc (path_size);
134 ptrdiff_t path_len = 0;
136 const char *p = string;
138 while (p < string + string_len)
140 /* The chunk we're about to stick on the end of result. */
141 const char *next = NULL;
142 ptrdiff_t next_len;
144 if (*p == '%')
146 p++;
148 if (p >= string + string_len)
149 next_len = 0;
150 else
151 switch (*p)
153 case '%':
154 next = "%";
155 next_len = 1;
156 break;
158 case 'C':
159 next = (x_customization_string
160 ? x_customization_string
161 : "");
162 next_len = strlen (next);
163 break;
165 case 'N':
166 next = class;
167 next_len = strlen (class);
168 break;
170 case 'T':
171 next = "app-defaults";
172 next_len = strlen (next);
173 break;
175 default:
176 case 'S':
177 next_len = 0;
178 break;
180 case 'L':
181 case 'l':
182 if (! lang)
184 xfree (path);
185 return NULL;
188 next = lang;
189 next_len = strlen (next);
190 break;
192 case 't':
193 case 'c':
194 xfree (path);
195 return NULL;
198 else
199 next = p, next_len = 1;
201 /* Do we have room for this component followed by a '\0' ? */
202 if (path_size - path_len <= next_len)
204 if (min (PTRDIFF_MAX, SIZE_MAX) / 2 - 1 - path_len < next_len)
205 memory_full (SIZE_MAX);
206 path_size = (path_len + next_len + 1) * 2;
207 path = xrealloc (path, path_size);
210 memcpy (path + path_len, next, next_len);
211 path_len += next_len;
213 p++;
215 /* If we've reached the end of the string, append ESCAPED_SUFFIX. */
216 if (p >= string + string_len && escaped_suffix)
218 string = escaped_suffix;
219 string_len = strlen (string);
220 p = string;
221 escaped_suffix = NULL;
225 path[path_len] = '\0';
227 if (! file_p (path))
229 xfree (path);
230 return NULL;
233 return path;
237 static char *
238 gethomedir (void)
240 struct passwd *pw;
241 char *ptr;
242 char *copy;
244 if ((ptr = getenv ("HOME")) == NULL)
246 if ((ptr = getenv ("LOGNAME")) != NULL
247 || (ptr = getenv ("USER")) != NULL)
248 pw = getpwnam (ptr);
249 else
250 pw = getpwuid (getuid ());
252 if (pw)
253 ptr = pw->pw_dir;
256 if (ptr == NULL)
257 return xstrdup ("/");
259 copy = xmalloc (strlen (ptr) + 2);
260 strcpy (copy, ptr);
261 strcat (copy, "/");
263 return copy;
267 static int
268 file_p (const char *filename)
270 struct stat status;
272 return (access (filename, 4) == 0 /* exists and is readable */
273 && stat (filename, &status) == 0 /* get the status */
274 && (S_ISDIR (status.st_mode)) == 0); /* not a directory */
278 /* Find the first element of SEARCH_PATH which exists and is readable,
279 after expanding the %-escapes. Return 0 if we didn't find any, and
280 the path name of the one we found otherwise. */
282 static char *
283 search_magic_path (const char *search_path, const char *class,
284 const char *escaped_suffix)
286 const char *s, *p;
288 for (s = search_path; *s; s = p)
290 for (p = s; *p && *p != ':'; p++)
293 if (p > s)
295 char *path = magic_file_p (s, p - s, class, escaped_suffix);
296 if (path)
297 return path;
299 else if (*p == ':')
301 char *path;
303 s = "%N%S";
304 path = magic_file_p (s, strlen (s), class, escaped_suffix);
305 if (path)
306 return path;
309 if (*p == ':')
310 p++;
313 return 0;
316 /* Producing databases for individual sources. */
318 static XrmDatabase
319 get_system_app (const char *class)
321 XrmDatabase db = NULL;
322 const char *path;
323 char *p;
325 path = getenv ("XFILESEARCHPATH");
326 if (! path) path = PATH_X_DEFAULTS;
328 p = search_magic_path (path, class, 0);
329 if (p)
331 db = XrmGetFileDatabase (p);
332 xfree (p);
335 return db;
339 static XrmDatabase
340 get_fallback (Display *display)
342 return NULL;
346 static XrmDatabase
347 get_user_app (const char *class)
349 const char *path;
350 char *file = 0;
351 char *free_it = 0;
353 /* Check for XUSERFILESEARCHPATH. It is a path of complete file
354 names, not directories. */
355 if (((path = getenv ("XUSERFILESEARCHPATH"))
356 && (file = search_magic_path (path, class, 0)))
358 /* Check for APPLRESDIR; it is a path of directories. In each,
359 we have to search for LANG/CLASS and then CLASS. */
360 || ((path = getenv ("XAPPLRESDIR"))
361 && ((file = search_magic_path (path, class, "/%L/%N"))
362 || (file = search_magic_path (path, class, "/%N"))))
364 /* Check in the home directory. This is a bit of a hack; let's
365 hope one's home directory doesn't contain any %-escapes. */
366 || (free_it = gethomedir (),
367 ((file = search_magic_path (free_it, class, "%L/%N"))
368 || (file = search_magic_path (free_it, class, "%N")))))
370 XrmDatabase db = XrmGetFileDatabase (file);
371 xfree (file);
372 xfree (free_it);
373 return db;
376 xfree (free_it);
377 return NULL;
381 static XrmDatabase
382 get_user_db (Display *display)
384 XrmDatabase db;
385 char *xdefs;
387 #ifdef PBaseSize /* Cheap way to test for X11R4 or later. */
388 xdefs = XResourceManagerString (display);
389 #else
390 xdefs = display->xdefaults;
391 #endif
393 if (xdefs != NULL)
394 db = XrmGetStringDatabase (xdefs);
395 else
397 char *home;
398 char *xdefault;
400 home = gethomedir ();
401 xdefault = xmalloc (strlen (home) + sizeof ".Xdefaults");
402 strcpy (xdefault, home);
403 strcat (xdefault, ".Xdefaults");
404 db = XrmGetFileDatabase (xdefault);
405 xfree (home);
406 xfree (xdefault);
409 #ifdef HAVE_XSCREENRESOURCESTRING
410 /* Get the screen-specific resources too. */
411 xdefs = XScreenResourceString (DefaultScreenOfDisplay (display));
412 if (xdefs != NULL)
414 XrmMergeDatabases (XrmGetStringDatabase (xdefs), &db);
415 XFree (xdefs);
417 #endif
419 return db;
422 static XrmDatabase
423 get_environ_db (void)
425 XrmDatabase db;
426 char *p;
427 char *path = 0;
429 if ((p = getenv ("XENVIRONMENT")) == NULL)
431 static char const xdefaults[] = ".Xdefaults-";
432 char *home = gethomedir ();
433 char const *host = get_system_name ();
434 ptrdiff_t pathsize = strlen (home) + sizeof xdefaults + strlen (host);
435 path = xrealloc (home, pathsize);
436 strcat (strcat (path, xdefaults), host);
437 p = path;
440 db = XrmGetFileDatabase (p);
442 xfree (path);
444 return db;
447 /* External interface. */
449 /* Types of values that we can find in a database */
451 #define XrmStringType "String" /* String representation */
452 static XrmRepresentation x_rm_string; /* Quark representation */
454 /* Load X resources based on the display and a possible -xrm option. */
456 XrmDatabase
457 x_load_resources (Display *display, const char *xrm_string,
458 const char *myname, const char *myclass)
460 XrmDatabase user_database;
461 XrmDatabase rdb;
462 XrmDatabase db;
463 char line[256];
465 #if defined USE_MOTIF || !defined HAVE_XFT || !defined USE_LUCID
466 const char *helv = "-*-helvetica-medium-r-*--*-120-*-*-*-*-iso8859-1";
467 #endif
469 #ifdef USE_MOTIF
470 const char *courier = "-*-courier-medium-r-*-*-*-120-*-*-*-*-iso8859-1";
471 #endif
473 x_rm_string = XrmStringToQuark (XrmStringType);
474 #ifndef USE_X_TOOLKIT
475 /* pmr@osf.org says this shouldn't be done if USE_X_TOOLKIT.
476 I suspect it's because the toolkit version does this elsewhere. */
477 XrmInitialize ();
478 #endif
479 rdb = XrmGetStringDatabase ("");
481 /* Add some font defaults. If the font `helv' doesn't exist, widgets
482 will use some other default font. */
483 #ifdef USE_MOTIF
485 sprintf (line, "%s.pane.background: grey75", myclass);
486 XrmPutLineResource (&rdb, line);
487 sprintf (line, "%s*fontList: %s", myclass, helv);
488 XrmPutLineResource (&rdb, line);
489 sprintf (line, "%s*menu*background: grey75", myclass);
490 XrmPutLineResource (&rdb, line);
491 sprintf (line, "%s*menubar*background: grey75", myclass);
492 XrmPutLineResource (&rdb, line);
493 sprintf (line, "%s*verticalScrollBar.background: grey75", myclass);
494 XrmPutLineResource (&rdb, line);
495 sprintf (line, "%s*verticalScrollBar.troughColor: grey75", myclass);
496 XrmPutLineResource (&rdb, line);
497 sprintf (line, "%s.dialog*.background: grey75", myclass);
498 XrmPutLineResource (&rdb, line);
499 sprintf (line, "%s*fsb.Text.background: white", myclass);
500 XrmPutLineResource (&rdb, line);
501 sprintf (line, "%s*fsb.FilterText.background: white", myclass);
502 XrmPutLineResource (&rdb, line);
503 sprintf (line, "%s*fsb*DirList.background: white", myclass);
504 XrmPutLineResource (&rdb, line);
505 sprintf (line, "%s*fsb*ItemsList.background: white", myclass);
506 XrmPutLineResource (&rdb, line);
507 sprintf (line, "%s*fsb*background: grey75", myclass);
508 XrmPutLineResource (&rdb, line);
509 sprintf (line, "%s*fsb.Text.fontList: %s", myclass, courier);
510 XrmPutLineResource (&rdb, line);
511 sprintf (line, "%s*fsb.FilterText.fontList: %s", myclass, courier);
512 XrmPutLineResource (&rdb, line);
513 sprintf (line, "%s*fsb*ItemsList.fontList: %s", myclass, courier);
514 XrmPutLineResource (&rdb, line);
515 sprintf (line, "%s*fsb*DirList.fontList: %s", myclass, courier);
516 XrmPutLineResource (&rdb, line);
518 /* Set double click time of list boxes in the file selection
519 dialog from `double-click-time'. */
520 if (INTEGERP (Vdouble_click_time) && XINT (Vdouble_click_time) > 0)
522 sprintf (line, "%s*fsb*DirList.doubleClickInterval: %"pI"d",
523 myclass, XFASTINT (Vdouble_click_time));
524 XrmPutLineResource (&rdb, line);
525 sprintf (line, "%s*fsb*ItemsList.doubleClickInterval: %"pI"d",
526 myclass, XFASTINT (Vdouble_click_time));
527 XrmPutLineResource (&rdb, line);
530 #else /* not USE_MOTIF */
532 sprintf (line, "Emacs.dialog*.background: grey75");
533 XrmPutLineResource (&rdb, line);
534 #if !defined (HAVE_XFT) || !defined (USE_LUCID)
535 sprintf (line, "Emacs.dialog*.font: %s", helv);
536 XrmPutLineResource (&rdb, line);
537 sprintf (line, "*XlwMenu*font: %s", helv);
538 XrmPutLineResource (&rdb, line);
539 #endif
540 sprintf (line, "*XlwMenu*background: grey75");
541 XrmPutLineResource (&rdb, line);
542 sprintf (line, "Emacs*verticalScrollBar.background: grey75");
543 XrmPutLineResource (&rdb, line);
545 #endif /* not USE_MOTIF */
547 user_database = get_user_db (display);
549 /* Figure out what the "customization string" is, so we can use it
550 to decode paths. */
551 xfree (x_customization_string);
552 x_customization_string
553 = x_get_customization_string (user_database, myname, myclass);
555 /* Get application system defaults */
556 db = get_system_app (myclass);
557 if (db != NULL)
558 XrmMergeDatabases (db, &rdb);
560 /* Get Fallback resources */
561 db = get_fallback (display);
562 if (db != NULL)
563 XrmMergeDatabases (db, &rdb);
565 /* Get application user defaults */
566 db = get_user_app (myclass);
567 if (db != NULL)
568 XrmMergeDatabases (db, &rdb);
570 /* get User defaults */
571 if (user_database != NULL)
572 XrmMergeDatabases (user_database, &rdb);
574 /* Get Environment defaults. */
575 db = get_environ_db ();
576 if (db != NULL)
577 XrmMergeDatabases (db, &rdb);
579 /* Last, merge in any specification from the command line. */
580 if (xrm_string != NULL)
582 db = XrmGetStringDatabase (xrm_string);
583 if (db != NULL)
584 XrmMergeDatabases (db, &rdb);
587 return rdb;
591 /* Retrieve the value of the resource specified by NAME with class CLASS
592 and of type TYPE from database RDB. The value is returned in RET_VALUE. */
594 static int
595 x_get_resource (XrmDatabase rdb, const char *name, const char *class,
596 XrmRepresentation expected_type, XrmValue *ret_value)
598 XrmValue value;
599 XrmName namelist[100];
600 XrmClass classlist[100];
601 XrmRepresentation type;
603 XrmStringToNameList (name, namelist);
604 XrmStringToClassList (class, classlist);
606 if (XrmQGetResource (rdb, namelist, classlist, &type, &value) == True
607 && (type == expected_type))
609 if (type == x_rm_string)
610 ret_value->addr = (char *) value.addr;
611 else
612 memcpy (ret_value->addr, value.addr, ret_value->size);
614 return value.size;
617 return 0;
620 /* Retrieve the string resource specified by NAME with CLASS from
621 database RDB. */
623 char *
624 x_get_string_resource (XrmDatabase rdb, const char *name, const char *class)
626 XrmValue value;
628 if (inhibit_x_resources)
629 /* --quick was passed, so this is a no-op. */
630 return NULL;
632 if (x_get_resource (rdb, name, class, x_rm_string, &value))
633 return (char *) value.addr;
635 return (char *) 0;
638 /* Stand-alone test facilities. */
640 #ifdef TESTRM
642 typedef char **List;
643 #define arg_listify(len, list) (list)
644 #define car(list) (*(list))
645 #define cdr(list) (list + 1)
646 #define NIL(list) (! *(list))
647 #define free_arglist(list)
649 static List
650 member (char *elt, List list)
652 List p;
654 for (p = list; ! NIL (p); p = cdr (p))
655 if (! strcmp (elt, car (p)))
656 return p;
658 return p;
661 static void
662 fatal (char *msg, char *prog)
664 if (errno)
665 perror (prog);
667 (void) fprintf (stderr, msg, prog);
668 exit (1);
672 main (int argc, char **argv)
674 Display *display;
675 char *displayname, *resource_string, *class, *name;
676 XrmDatabase xdb;
677 List arg_list, lp;
679 arg_list = arg_listify (argc, argv);
681 lp = member ("-d", arg_list);
682 if (!NIL (lp))
683 displayname = car (cdr (lp));
684 else
685 displayname = "localhost:0.0";
687 lp = member ("-xrm", arg_list);
688 if (! NIL (lp))
689 resource_string = car (cdr (lp));
690 else
691 resource_string = (char *) 0;
693 lp = member ("-c", arg_list);
694 if (! NIL (lp))
695 class = car (cdr (lp));
696 else
697 class = "Emacs";
699 lp = member ("-n", arg_list);
700 if (! NIL (lp))
701 name = car (cdr (lp));
702 else
703 name = "emacs";
705 free_arglist (arg_list);
707 if (!(display = XOpenDisplay (displayname)))
708 fatal ("Can't open display '%s'\n", XDisplayName (displayname));
710 xdb = x_load_resources (display, resource_string, name, class);
712 /* In a real program, you'd want to also do this: */
713 display->db = xdb;
715 while (1)
717 char query_name[90];
718 char query_class[90];
720 printf ("Name: ");
721 gets (query_name);
723 if (strlen (query_name))
725 char *value;
727 printf ("Class: ");
728 gets (query_class);
730 value = x_get_string_resource (xdb, query_name, query_class);
732 if (value != NULL)
733 printf ("\t%s(%s): %s\n\n", query_name, query_class, value);
734 else
735 printf ("\tNo Value.\n\n");
737 else
738 break;
740 printf ("\tExit.\n\n");
742 XCloseDisplay (display);
744 return 0;
746 #endif /* TESTRM */