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[emacs.git] / src / xrdb.c
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1 /* Deal with the X Resource Manager.
2 Copyright (C) 1990, 1993, 1994, 2000, 2001 Free Software Foundation.
4 This file is part of GNU Emacs.
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.
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.
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. */
21 /* Written by jla, 4/90 */
23 #ifdef emacs
24 #include <config.h>
25 #endif
27 #ifdef HAVE_UNISTD_H
28 #include <unistd.h>
29 #endif
31 #include <epaths.h>
33 #include <stdio.h>
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 #endif /* USG5 */
43 #endif /* 1 */
45 #include <X11/Xlib.h>
46 #include <X11/Xatom.h>
47 #if 0
48 #include <X11/Xos.h>
49 #endif
50 #include <X11/X.h>
51 #include <X11/Xutil.h>
52 #include <X11/Xresource.h>
53 #ifdef VMS
54 #include "vms-pwd.h"
55 #else
56 #include <pwd.h>
57 #endif
58 #include <sys/stat.h>
60 #if !defined(S_ISDIR) && defined(S_IFDIR)
61 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
62 #endif
64 #include "lisp.h"
66 extern char *getenv ();
68 /* This does cause trouble on AIX. I'm going to take the comment at
69 face value. */
70 #if 0
71 extern short getuid (); /* If this causes portability problems,
72 I think we should just delete it; it'll
73 default to `int' anyway. */
74 #endif
76 #ifdef DECLARE_GETPWUID_WITH_UID_T
77 extern struct passwd *getpwuid (uid_t);
78 extern struct passwd *getpwnam (const char *);
79 #else
80 extern struct passwd *getpwuid ();
81 extern struct passwd *getpwnam ();
82 #endif
84 extern char *get_system_name ();
86 /* Make sure not to #include anything after these definitions. Let's
87 not step on anyone's prototypes. */
88 #ifdef emacs
89 #define malloc xmalloc
90 #define realloc xrealloc
91 #define free xfree
92 #endif
94 char *x_get_string_resource ();
95 static int file_p ();
98 /* X file search path processing. */
101 /* The string which gets substituted for the %C escape in XFILESEARCHPATH
102 and friends, or zero if none was specified. */
103 char *x_customization_string;
106 /* Return the value of the emacs.customization (Emacs.Customization)
107 resource, for later use in search path decoding. If we find no
108 such resource, return zero. */
109 char *
110 x_get_customization_string (db, name, class)
111 XrmDatabase db;
112 char *name, *class;
114 char *full_name
115 = (char *) alloca (strlen (name) + sizeof ("customization") + 3);
116 char *full_class
117 = (char *) alloca (strlen (class) + sizeof ("Customization") + 3);
118 char *result;
120 sprintf (full_name, "%s.%s", name, "customization");
121 sprintf (full_class, "%s.%s", class, "Customization");
123 result = x_get_string_resource (db, full_name, full_class);
125 if (result)
127 char *copy = (char *) malloc (strlen (result) + 1);
128 strcpy (copy, result);
129 return copy;
131 else
132 return 0;
136 /* Expand all the Xt-style %-escapes in STRING, whose length is given
137 by STRING_LEN. Here are the escapes we're supposed to recognize:
139 %N The value of the application's class name
140 %T The value of the type parameter ("app-defaults" in this
141 context)
142 %S The value of the suffix parameter ("" in this context)
143 %L The language string associated with the specified display
144 (We use the "LANG" environment variable here, if it's set.)
145 %l The language part of the display's language string
146 (We treat this just like %L. If someone can tell us what
147 we're really supposed to do, dandy.)
148 %t The territory part of the display's language string
149 (This never gets used.)
150 %c The codeset part of the display's language string
151 (This never gets used either.)
152 %C The customization string retrieved from the resource
153 database associated with display.
154 (This is x_customization_string.)
156 Return the expanded file name if it exists and is readable, and
157 refers to %L only when the LANG environment variable is set, or
158 otherwise provided by X.
160 ESCAPED_SUFFIX and SUFFIX are postpended to STRING if they are
161 non-zero. %-escapes in ESCAPED_SUFFIX are expanded; STRING is left
162 alone.
164 Return NULL otherwise. */
166 static char *
167 magic_file_p (string, string_len, class, escaped_suffix, suffix)
168 char *string;
169 int string_len;
170 char *class, *escaped_suffix, *suffix;
172 char *lang = getenv ("LANG");
174 int path_size = 100;
175 char *path = (char *) malloc (path_size);
176 int path_len = 0;
178 char *p = string;
180 while (p < string + string_len)
182 /* The chunk we're about to stick on the end of result. */
183 char *next = NULL;
184 int next_len;
186 if (*p == '%')
188 p++;
190 if (p >= string + string_len)
191 next_len = 0;
192 else
193 switch (*p)
195 case '%':
196 next = "%";
197 next_len = 1;
198 break;
200 case 'C':
201 next = (x_customization_string
202 ? x_customization_string
203 : "");
204 next_len = strlen (next);
205 break;
207 case 'N':
208 next = class;
209 next_len = strlen (class);
210 break;
212 case 'T':
213 next = "app-defaults";
214 next_len = strlen (next);
215 break;
217 default:
218 case 'S':
219 next_len = 0;
220 break;
222 case 'L':
223 case 'l':
224 if (! lang)
226 free (path);
227 return NULL;
230 next = lang;
231 next_len = strlen (next);
232 break;
234 case 't':
235 case 'c':
236 free (path);
237 return NULL;
240 else
241 next = p, next_len = 1;
243 /* Do we have room for this component followed by a '\0' ? */
244 if (path_len + next_len + 1 > path_size)
246 path_size = (path_len + next_len + 1) * 2;
247 path = (char *) realloc (path, path_size);
250 bcopy (next, path + path_len, next_len);
251 path_len += next_len;
253 p++;
255 /* If we've reached the end of the string, append ESCAPED_SUFFIX. */
256 if (p >= string + string_len && escaped_suffix)
258 string = escaped_suffix;
259 string_len = strlen (string);
260 p = string;
261 escaped_suffix = NULL;
265 /* Perhaps we should add the SUFFIX now. */
266 if (suffix)
268 int suffix_len = strlen (suffix);
270 if (path_len + suffix_len + 1 > path_size)
272 path_size = (path_len + suffix_len + 1);
273 path = (char *) realloc (path, path_size);
276 bcopy (suffix, path + path_len, suffix_len);
277 path_len += suffix_len;
280 path[path_len] = '\0';
282 if (! file_p (path))
284 free (path);
285 return NULL;
288 return path;
292 static char *
293 gethomedir ()
295 struct passwd *pw;
296 char *ptr;
297 char *copy;
299 if ((ptr = getenv ("HOME")) == NULL)
301 if ((ptr = getenv ("LOGNAME")) != NULL
302 || (ptr = getenv ("USER")) != NULL)
303 pw = getpwnam (ptr);
304 else
305 pw = getpwuid (getuid ());
307 if (pw)
308 ptr = pw->pw_dir;
311 if (ptr == NULL)
312 return "/";
314 copy = (char *) malloc (strlen (ptr) + 2);
315 strcpy (copy, ptr);
316 strcat (copy, "/");
318 return copy;
322 static int
323 file_p (path)
324 char *path;
326 struct stat status;
328 return (access (path, 4) == 0 /* exists and is readable */
329 && stat (path, &status) == 0 /* get the status */
330 && (S_ISDIR (status.st_mode)) == 0); /* not a directory */
334 /* Find the first element of SEARCH_PATH which exists and is readable,
335 after expanding the %-escapes. Return 0 if we didn't find any, and
336 the path name of the one we found otherwise. */
338 static char *
339 search_magic_path (search_path, class, escaped_suffix, suffix)
340 char *search_path, *class, *escaped_suffix, *suffix;
342 register char *s, *p;
344 for (s = search_path; *s; s = p)
346 for (p = s; *p && *p != ':'; p++)
349 if (p > s)
351 char *path = magic_file_p (s, p - s, class, escaped_suffix, suffix);
352 if (path)
353 return path;
355 else if (*p == ':')
357 char *path;
359 s = "%N%S";
360 path = magic_file_p (s, strlen (s), class, escaped_suffix, suffix);
361 if (path)
362 return path;
365 if (*p == ':')
366 p++;
369 return 0;
372 /* Producing databases for individual sources. */
374 static XrmDatabase
375 get_system_app (class)
376 char *class;
378 XrmDatabase db = NULL;
379 char *path;
381 path = getenv ("XFILESEARCHPATH");
382 if (! path) path = PATH_X_DEFAULTS;
384 path = search_magic_path (path, class, 0, 0);
385 if (path)
387 db = XrmGetFileDatabase (path);
388 free (path);
391 return db;
395 static XrmDatabase
396 get_fallback (display)
397 Display *display;
399 return NULL;
403 static XrmDatabase
404 get_user_app (class)
405 char *class;
407 char *path;
408 char *file = 0;
409 char *free_it = 0;
411 /* Check for XUSERFILESEARCHPATH. It is a path of complete file
412 names, not directories. */
413 if (((path = getenv ("XUSERFILESEARCHPATH"))
414 && (file = search_magic_path (path, class, 0, 0)))
416 /* Check for APPLRESDIR; it is a path of directories. In each,
417 we have to search for LANG/CLASS and then CLASS. */
418 || ((path = getenv ("XAPPLRESDIR"))
419 && ((file = search_magic_path (path, class, "/%L/%N", 0))
420 || (file = search_magic_path (path, class, "/%N", 0))))
422 /* Check in the home directory. This is a bit of a hack; let's
423 hope one's home directory doesn't contain any %-escapes. */
424 || (free_it = gethomedir (),
425 ((file = search_magic_path (free_it, class, "%L/%N", 0))
426 || (file = search_magic_path (free_it, class, "%N", 0)))))
428 XrmDatabase db = XrmGetFileDatabase (file);
429 free (file);
430 if (free_it)
431 free (free_it);
432 return db;
435 if (free_it)
436 free (free_it);
437 return NULL;
441 static XrmDatabase
442 get_user_db (display)
443 Display *display;
445 XrmDatabase db;
446 char *xdefs;
448 #ifdef PBaseSize /* Cheap way to test for X11R4 or later. */
449 xdefs = XResourceManagerString (display);
450 #else
451 xdefs = display->xdefaults;
452 #endif
454 if (xdefs != NULL)
455 db = XrmGetStringDatabase (xdefs);
456 else
458 char *home;
459 char *xdefault;
461 home = gethomedir ();
462 xdefault = (char *) malloc (strlen (home) + sizeof (".Xdefaults"));
463 strcpy (xdefault, home);
464 strcat (xdefault, ".Xdefaults");
465 db = XrmGetFileDatabase (xdefault);
466 free (home);
467 free (xdefault);
470 #ifdef HAVE_XSCREENRESOURCESTRING
471 /* Get the screen-specific resources too. */
472 xdefs = XScreenResourceString (DefaultScreenOfDisplay (display));
473 if (xdefs != NULL)
475 XrmMergeDatabases (XrmGetStringDatabase (xdefs), &db);
476 XFree (xdefs);
478 #endif
480 return db;
483 static XrmDatabase
484 get_environ_db ()
486 XrmDatabase db;
487 char *p;
488 char *path = 0, *home = 0, *host;
490 if ((p = getenv ("XENVIRONMENT")) == NULL)
492 home = gethomedir ();
493 host = get_system_name ();
494 path = (char *) malloc (strlen (home)
495 + sizeof (".Xdefaults-")
496 + strlen (host));
497 sprintf (path, "%s%s%s", home, ".Xdefaults-", host);
498 p = path;
501 db = XrmGetFileDatabase (p);
503 if (path) free (path);
504 if (home) free (home);
506 return db;
509 /* External interface. */
511 /* Types of values that we can find in a database */
513 #define XrmStringType "String" /* String representation */
514 XrmRepresentation x_rm_string; /* Quark representation */
516 /* Load X resources based on the display and a possible -xrm option. */
518 XrmDatabase
519 x_load_resources (display, xrm_string, myname, myclass)
520 Display *display;
521 char *xrm_string, *myname, *myclass;
523 XrmDatabase user_database;
524 XrmDatabase rdb;
525 XrmDatabase db;
526 char line[256];
527 char *helv = "-*-helvetica-medium-r-*--*-120-*-*-*-*-iso8859-1";
528 #ifdef USE_MOTIF
529 char *courier = "-*-courier-medium-r-*-*-*-120-*-*-*-*-iso8859-1";
530 extern Lisp_Object Vdouble_click_time;
531 #endif
533 x_rm_string = XrmStringToQuark (XrmStringType);
534 #ifndef USE_X_TOOLKIT
535 /* pmr@osf.org says this shouldn't be done if USE_X_TOOLKIT.
536 I suspect it's because the toolkit version does this elsewhere. */
537 XrmInitialize ();
538 #endif
539 rdb = XrmGetStringDatabase ("");
541 /* Add some font defaults. If the font `helv' doesn't exist, widgets
542 will use some other default font. */
543 #ifdef USE_MOTIF
545 sprintf (line, "%s.pane.background: grey75", myclass);
546 XrmPutLineResource (&rdb, line);
547 sprintf (line, "%s*fontList: %s", myclass, helv);
548 XrmPutLineResource (&rdb, line);
549 sprintf (line, "%s*menu*background: grey75", myclass);
550 XrmPutLineResource (&rdb, line);
551 sprintf (line, "%s*menubar*background: grey75", myclass);
552 XrmPutLineResource (&rdb, line);
553 sprintf (line, "%s*verticalScrollBar.background: grey75", myclass);
554 XrmPutLineResource (&rdb, line);
555 sprintf (line, "%s*verticalScrollBar.troughColor: grey75", myclass);
556 XrmPutLineResource (&rdb, line);
557 sprintf (line, "%s.dialog*.background: grey75", myclass);
558 XrmPutLineResource (&rdb, line);
559 sprintf (line, "%s*fsb.Text.background: white", myclass);
560 XrmPutLineResource (&rdb, line);
561 sprintf (line, "%s*fsb.FilterText.background: white", myclass);
562 XrmPutLineResource (&rdb, line);
563 sprintf (line, "%s*fsb*DirList.background: white", myclass);
564 XrmPutLineResource (&rdb, line);
565 sprintf (line, "%s*fsb*ItemsList.background: white", myclass);
566 XrmPutLineResource (&rdb, line);
567 sprintf (line, "%s*fsb*background: grey75", myclass);
568 XrmPutLineResource (&rdb, line);
569 sprintf (line, "%s*fsb.Text.fontList: %s", myclass, courier);
570 XrmPutLineResource (&rdb, line);
571 sprintf (line, "%s*fsb.FilterText.fontList: %s", myclass, courier);
572 XrmPutLineResource (&rdb, line);
573 sprintf (line, "%s*fsb*ItemsList.fontList: %s", myclass, courier);
574 XrmPutLineResource (&rdb, line);
575 sprintf (line, "%s*fsb*DirList.fontList: %s", myclass, courier);
576 XrmPutLineResource (&rdb, line);
578 /* Set double click time of list boxes in the file selection
579 dialog from `double-click-time'. */
580 if (INTEGERP (Vdouble_click_time) && XINT (Vdouble_click_time) > 0)
582 sprintf (line, "%s*fsb*DirList.doubleClickInterval: %d",
583 myclass, XFASTINT (Vdouble_click_time));
584 XrmPutLineResource (&rdb, line);
585 sprintf (line, "%s*fsb*ItemsList.doubleClickInterval: %d",
586 myclass, XFASTINT (Vdouble_click_time));
587 XrmPutLineResource (&rdb, line);
590 #else /* not USE_MOTIF */
592 sprintf (line, "Emacs.dialog*.font: %s", helv);
593 XrmPutLineResource (&rdb, line);
594 sprintf (line, "Emacs.dialog*.background: grey75");
595 XrmPutLineResource (&rdb, line);
596 sprintf (line, "*XlwMenu*font: %s", helv);
597 XrmPutLineResource (&rdb, line);
598 sprintf (line, "*XlwMenu*background: grey75");
599 XrmPutLineResource (&rdb, line);
600 sprintf (line, "Emacs*verticalScrollBar.background: grey75");
601 XrmPutLineResource (&rdb, line);
603 #endif /* not USE_MOTIF */
605 user_database = get_user_db (display);
607 /* Figure out what the "customization string" is, so we can use it
608 to decode paths. */
609 if (x_customization_string)
610 free (x_customization_string);
611 x_customization_string
612 = x_get_customization_string (user_database, myname, myclass);
614 /* Get application system defaults */
615 db = get_system_app (myclass);
616 if (db != NULL)
617 XrmMergeDatabases (db, &rdb);
619 /* Get Fallback resources */
620 db = get_fallback (display);
621 if (db != NULL)
622 XrmMergeDatabases (db, &rdb);
624 /* Get application user defaults */
625 db = get_user_app (myclass);
626 if (db != NULL)
627 XrmMergeDatabases (db, &rdb);
629 /* get User defaults */
630 if (user_database != NULL)
631 XrmMergeDatabases (user_database, &rdb);
633 /* Get Environment defaults. */
634 db = get_environ_db ();
635 if (db != NULL)
636 XrmMergeDatabases (db, &rdb);
638 /* Last, merge in any specification from the command line. */
639 if (xrm_string != NULL)
641 db = XrmGetStringDatabase (xrm_string);
642 if (db != NULL)
643 XrmMergeDatabases (db, &rdb);
646 return rdb;
650 /* Retrieve the value of the resource specified by NAME with class CLASS
651 and of type TYPE from database RDB. The value is returned in RET_VALUE. */
654 x_get_resource (rdb, name, class, expected_type, ret_value)
655 XrmDatabase rdb;
656 char *name, *class;
657 XrmRepresentation expected_type;
658 XrmValue *ret_value;
660 XrmValue value;
661 XrmName namelist[100];
662 XrmClass classlist[100];
663 XrmRepresentation type;
665 XrmStringToNameList(name, namelist);
666 XrmStringToClassList(class, classlist);
668 if (XrmQGetResource (rdb, namelist, classlist, &type, &value) == True
669 && (type == expected_type))
671 if (type == x_rm_string)
672 ret_value->addr = (char *) value.addr;
673 else
674 bcopy (value.addr, ret_value->addr, ret_value->size);
676 return value.size;
679 return 0;
682 /* Retrieve the string resource specified by NAME with CLASS from
683 database RDB. */
685 char *
686 x_get_string_resource (rdb, name, class)
687 XrmDatabase rdb;
688 char *name, *class;
690 XrmValue value;
692 if (x_get_resource (rdb, name, class, x_rm_string, &value))
693 return (char *) value.addr;
695 return (char *) 0;
698 /* Stand-alone test facilities. */
700 #ifdef TESTRM
702 typedef char **List;
703 #define arg_listify(len, list) (list)
704 #define car(list) (*(list))
705 #define cdr(list) (list + 1)
706 #define NIL(list) (! *(list))
707 #define free_arglist(list)
709 static List
710 member (elt, list)
711 char *elt;
712 List list;
714 List p;
716 for (p = list; ! NIL (p); p = cdr (p))
717 if (! strcmp (elt, car (p)))
718 return p;
720 return p;
723 static void
724 fatal (msg, prog, x1, x2, x3, x4, x5)
725 char *msg, *prog;
726 int x1, x2, x3, x4, x5;
728 extern int errno;
730 if (errno)
731 perror (prog);
733 (void) fprintf (stderr, msg, prog, x1, x2, x3, x4, x5);
734 exit (1);
737 main (argc, argv)
738 int argc;
739 char **argv;
741 Display *display;
742 char *displayname, *resource_string, *class, *name;
743 XrmDatabase xdb;
744 List arg_list, lp;
746 arg_list = arg_listify (argc, argv);
748 lp = member ("-d", arg_list);
749 if (!NIL (lp))
750 displayname = car (cdr (lp));
751 else
752 displayname = "localhost:0.0";
754 lp = member ("-xrm", arg_list);
755 if (! NIL (lp))
756 resource_string = car (cdr (lp));
757 else
758 resource_string = (char *) 0;
760 lp = member ("-c", arg_list);
761 if (! NIL (lp))
762 class = car (cdr (lp));
763 else
764 class = "Emacs";
766 lp = member ("-n", arg_list);
767 if (! NIL (lp))
768 name = car (cdr (lp));
769 else
770 name = "emacs";
772 free_arglist (arg_list);
774 if (!(display = XOpenDisplay (displayname)))
775 fatal ("Can't open display '%s'\n", XDisplayName (displayname));
777 xdb = x_load_resources (display, resource_string, name, class);
779 /* In a real program, you'd want to also do this: */
780 display->db = xdb;
782 while (1)
784 char query_name[90];
785 char query_class[90];
787 printf ("Name: ");
788 gets (query_name);
790 if (strlen (query_name))
792 char *value;
794 printf ("Class: ");
795 gets (query_class);
797 value = x_get_string_resource (xdb, query_name, query_class);
799 if (value != NULL)
800 printf ("\t%s(%s): %s\n\n", query_name, query_class, value);
801 else
802 printf ("\tNo Value.\n\n");
804 else
805 break;
807 printf ("\tExit.\n\n");
809 XCloseDisplay (display);
811 #endif /* TESTRM */