514 lines
13 KiB
C
514 lines
13 KiB
C
/* Deal with the X Resource Manager.
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Copyright (C) 1990, 1993-1994, 2000-2026 Free Software Foundation,
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Inc.
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Author: Joseph Arceneaux
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Created: 4/90
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This file is part of GNU Emacs.
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GNU Emacs is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at
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your option) any later version.
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GNU Emacs is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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#include <unistd.h>
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#include <errno.h>
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#include <epaths.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "lisp.h"
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/* This may include sys/types.h, and that somehow loses
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if this is not done before the other system files. */
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#include "xterm.h"
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#include <X11/Xlib.h>
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#include <X11/Xatom.h>
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#include <X11/X.h>
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#include <X11/Xutil.h>
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#include <X11/Xresource.h>
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#ifdef HAVE_PWD_H
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#include <pwd.h>
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#endif
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/* X file search path processing. */
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/* The string which gets substituted for the %C escape in XFILESEARCHPATH
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and friends, or zero if none was specified. */
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static char *x_customization_string;
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/* Return the value of the emacs.customization (Emacs.Customization)
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resource, for later use in search path decoding. If we find no
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such resource, return zero. */
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static char *
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x_get_customization_string (XrmDatabase db, const char *name,
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const char *class)
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{
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char *full_name = alloca (strlen (name) + sizeof "customization" + 3);
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char *full_class = alloca (strlen (class) + sizeof "Customization" + 3);
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const char *result;
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sprintf (full_name, "%s.%s", name, "customization");
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sprintf (full_class, "%s.%s", class, "Customization");
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result = x_get_string_resource (&db, full_name, full_class);
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return result ? xstrdup (result) : NULL;
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}
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/* Expand all the Xt-style %-escapes in STRING, whose length is given
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by STRING_LEN. Here are the escapes we're supposed to recognize:
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%N The value of the application's class name
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%T The value of the type parameter ("app-defaults" in this
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context)
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%S The value of the suffix parameter ("" in this context)
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%L The language string associated with the specified display
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(We use the "LANG" environment variable here, if it's set.)
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%l The language part of the display's language string
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(We treat this just like %L. If someone can tell us what
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we're really supposed to do, dandy.)
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%t The territory part of the display's language string
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(This never gets used.)
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%c The codeset part of the display's language string
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(This never gets used either.)
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%C The customization string retrieved from the resource
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database associated with display.
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(This is x_customization_string.)
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Return the resource database if its file was read successfully, and
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refers to %L only when the LANG environment variable is set, or
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otherwise provided by X.
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ESCAPED_SUFFIX is postpended to STRING if it is non-zero.
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%-escapes in ESCAPED_SUFFIX are expanded.
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Return NULL otherwise. */
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static XrmDatabase
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magic_db (const char *string, ptrdiff_t string_len, const char *class,
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const char *escaped_suffix)
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{
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XrmDatabase db;
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char *lang = getenv ("LANG");
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ptrdiff_t path_size = 100;
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char *path = xmalloc (path_size);
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ptrdiff_t path_len = 0;
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const char *p = string;
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while (p < string + string_len)
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{
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/* The chunk we're about to stick on the end of result. */
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const char *next = p;
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ptrdiff_t next_len = 1;
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if (*p == '%')
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{
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p++;
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if (p >= string + string_len)
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next_len = 0;
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else
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switch (*p)
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{
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case '%':
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next = "%";
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next_len = 1;
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break;
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case 'C':
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if (x_customization_string)
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{
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next = x_customization_string;
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next_len = strlen (next);
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}
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else
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next_len = 0;
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break;
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case 'N':
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next = class;
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next_len = strlen (class);
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break;
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case 'T':
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next = "app-defaults";
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next_len = strlen (next);
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break;
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default:
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case 'S':
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next_len = 0;
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break;
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case 'L':
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case 'l':
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if (! lang)
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{
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xfree (path);
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return NULL;
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}
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next = lang;
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next_len = strlen (next);
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break;
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case 't':
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case 'c':
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xfree (path);
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return NULL;
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}
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}
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/* Do we have room for this component followed by a '\0'? */
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if (path_size - path_len <= next_len)
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path = xpalloc (path, &path_size, path_len - path_size + next_len + 1,
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-1, sizeof *path);
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memcpy (path + path_len, next, next_len);
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path_len += next_len;
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p++;
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/* If we've reached the end of the string, append ESCAPED_SUFFIX. */
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if (p >= string + string_len && escaped_suffix)
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{
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string = escaped_suffix;
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string_len = strlen (string);
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p = string;
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escaped_suffix = NULL;
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}
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}
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path[path_len] = '\0';
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db = XrmGetFileDatabase (path);
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xfree (path);
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return db;
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}
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/* Find the first element of SEARCH_PATH which exists and is readable,
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after expanding the %-escapes. Return 0 if we didn't find any, and
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the path name of the one we found otherwise. */
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static XrmDatabase
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search_magic_path (const char *search_path, const char *class,
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const char *escaped_suffix)
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{
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const char *s, *p;
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for (s = search_path; *s; s = p)
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{
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for (p = s; *p && *p != ':'; p++)
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;
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if (p > s)
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{
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XrmDatabase db = magic_db (s, p - s, class, escaped_suffix);
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if (db)
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return db;
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}
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else if (*p == ':')
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{
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static char const ns[] = "%N%S";
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XrmDatabase db = magic_db (ns, strlen (ns), class, escaped_suffix);
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if (db)
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return db;
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}
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if (*p == ':')
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p++;
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}
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return 0;
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}
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/* Producing databases for individual sources. */
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static XrmDatabase
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get_system_app (const char *class)
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{
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const char *path;
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path = getenv ("XFILESEARCHPATH");
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if (! path) path = PATH_X_DEFAULTS;
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return search_magic_path (path, class, 0);
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}
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static XrmDatabase
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get_fallback (Display *display)
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{
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return NULL;
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}
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static XrmDatabase
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get_user_app (const char *class)
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{
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XrmDatabase db = 0;
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const char *path;
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/* Check for XUSERFILESEARCHPATH. It is a path of complete file
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names, not directories. */
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path = getenv ("XUSERFILESEARCHPATH");
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if (path)
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db = search_magic_path (path, class, 0);
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if (! db)
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{
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/* Check for APPLRESDIR; it is a path of directories. In each,
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we have to search for LANG/CLASS and then CLASS. */
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path = getenv ("XAPPLRESDIR");
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if (path)
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{
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db = search_magic_path (path, class, "/%L/%N");
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if (!db)
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db = search_magic_path (path, class, "/%N");
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}
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}
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if (! db)
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{
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/* Check in the home directory. This is a bit of a hack; let's
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hope one's home directory doesn't contain ':' or '%'. */
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char const *home = get_homedir ();
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db = search_magic_path (home, class, "/%L/%N");
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if (! db)
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db = search_magic_path (home, class, "/%N");
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}
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return db;
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}
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static char const xdefaults[] = ".Xdefaults";
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static XrmDatabase
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get_user_db (Display *display)
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{
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XrmDatabase db;
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char *xdefs;
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#ifdef PBaseSize /* Cheap way to test for X11R4 or later. */
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xdefs = XResourceManagerString (display);
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#else
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xdefs = display->xdefaults;
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#endif
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if (xdefs != NULL)
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db = XrmGetStringDatabase (xdefs);
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else
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{
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/* Use ~/.Xdefaults. */
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char const *home = get_homedir ();
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char *filename = xmalloc (strlen (home) + 1 + sizeof xdefaults);
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splice_dir_file (filename, home, xdefaults);
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db = XrmGetFileDatabase (filename);
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xfree (filename);
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}
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#ifdef HAVE_XSCREENRESOURCESTRING
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/* Get the screen-specific resources too. */
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xdefs = XScreenResourceString (DefaultScreenOfDisplay (display));
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if (xdefs != NULL)
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{
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XrmMergeDatabases (XrmGetStringDatabase (xdefs), &db);
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XFree (xdefs);
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}
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#endif
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return db;
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}
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static XrmDatabase
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get_environ_db (void)
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{
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XrmDatabase db;
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char *p = getenv ("XENVIRONMENT");
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char *filename = 0;
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if (!p)
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{
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Lisp_Object system_name = Fsystem_name ();
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if (STRINGP (system_name))
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{
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/* Use ~/.Xdefaults-HOSTNAME. */
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char const *home = get_homedir ();
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p = filename = xmalloc (strlen (home) + 1 + sizeof xdefaults
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+ 1 + SBYTES (system_name));
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char *e = splice_dir_file (p, home, xdefaults);
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*e++ = '-';
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lispstpcpy (e, system_name);
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}
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}
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db = XrmGetFileDatabase (p);
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xfree (filename);
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return db;
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}
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/* External interface. */
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/* Types of values that we can find in a database */
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#define XrmStringType "String" /* String representation */
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static XrmRepresentation x_rm_string; /* Quark representation */
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/* Load X resources based on the display and a possible -xrm option. */
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XrmDatabase
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x_load_resources (Display *display, const char *xrm_string,
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const char *myname, const char *myclass)
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{
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XrmDatabase user_database;
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XrmDatabase rdb;
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XrmDatabase db;
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char line[256];
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x_rm_string = XrmStringToQuark (XrmStringType);
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#ifndef USE_X_TOOLKIT
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/* pmr@osf.org says this shouldn't be done if USE_X_TOOLKIT.
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I suspect it's because the toolkit version does this elsewhere. */
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XrmInitialize ();
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#endif
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rdb = XrmGetStringDatabase ("");
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#ifdef USE_MOTIF
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/* Set double click time of list boxes in the file selection
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dialog from `double-click-time'. */
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if (FIXNUMP (Vdouble_click_time) && XFIXNUM (Vdouble_click_time) > 0)
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{
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sprintf (line, "%s*fsb*DirList.doubleClickInterval: %"pI"d",
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myclass, XFIXNAT (Vdouble_click_time));
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XrmPutLineResource (&rdb, line);
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sprintf (line, "%s*fsb*ItemsList.doubleClickInterval: %"pI"d",
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myclass, XFIXNAT (Vdouble_click_time));
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XrmPutLineResource (&rdb, line);
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}
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#else /* not USE_MOTIF */
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/* Add some font defaults. If the font `helv' doesn't exist,
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widgets will use some other default font. */
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sprintf (line, "Emacs.dialog*.background: grey75");
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XrmPutLineResource (&rdb, line);
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#if !(defined USE_CAIRO || defined HAVE_XFT) || !defined (USE_LUCID)
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sprintf (line, "Emacs.dialog*.font: %s",
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"-*-helvetica-medium-r-*--*-120-*-*-*-*-iso8859-1");
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XrmPutLineResource (&rdb, line);
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sprintf (line, "*XlwMenu*font: %s",
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"-*-helvetica-medium-r-*--*-120-*-*-*-*-iso8859-1");
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XrmPutLineResource (&rdb, line);
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#endif
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sprintf (line, "*XlwMenu*background: grey75");
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XrmPutLineResource (&rdb, line);
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sprintf (line, "Emacs*verticalScrollBar.background: grey75");
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XrmPutLineResource (&rdb, line);
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sprintf (line, "Emacs*horizontalScrollBar.background: grey75");
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XrmPutLineResource (&rdb, line);
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#endif /* not USE_MOTIF */
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user_database = get_user_db (display);
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/* Figure out what the "customization string" is, so we can use it
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to decode paths. */
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xfree (x_customization_string);
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x_customization_string
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= x_get_customization_string (user_database, myname, myclass);
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/* Get application system defaults */
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db = get_system_app (myclass);
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if (db != NULL)
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XrmMergeDatabases (db, &rdb);
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/* Get Fallback resources */
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db = get_fallback (display);
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if (db != NULL)
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XrmMergeDatabases (db, &rdb);
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/* Get application user defaults */
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db = get_user_app (myclass);
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if (db != NULL)
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XrmMergeDatabases (db, &rdb);
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/* get User defaults */
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if (user_database != NULL)
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XrmMergeDatabases (user_database, &rdb);
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/* Get Environment defaults. */
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db = get_environ_db ();
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if (db != NULL)
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XrmMergeDatabases (db, &rdb);
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/* Last, merge in any specification from the command line. */
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if (xrm_string != NULL)
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{
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db = XrmGetStringDatabase (xrm_string);
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if (db != NULL)
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XrmMergeDatabases (db, &rdb);
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}
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return rdb;
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}
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/* Retrieve the value of the resource specified by NAME with class CLASS
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and of type TYPE from database RDB. The value is returned in RET_VALUE. */
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static int
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x_get_resource (XrmDatabase rdb, const char *name, const char *class,
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XrmRepresentation expected_type, XrmValue *ret_value)
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{
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XrmValue value;
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XrmName namelist[100];
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XrmClass classlist[100];
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XrmRepresentation type;
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XrmStringToNameList (name, namelist);
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XrmStringToClassList (class, classlist);
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if (XrmQGetResource (rdb, namelist, classlist, &type, &value) == True
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&& (type == expected_type))
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{
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*ret_value = value;
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return value.size;
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}
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return 0;
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}
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/* Retrieve the string resource specified by NAME with CLASS from
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database RDB. */
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const char *
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x_get_string_resource (void *v_rdb, const char *name, const char *class)
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{
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XrmDatabase *rdb = v_rdb;
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XrmValue value;
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if (inhibit_x_resources)
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/* --quick was passed, so this is a no-op. */
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return NULL;
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if (x_get_resource (*rdb, name, class, x_rm_string, &value))
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return (const char *) value.addr;
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return NULL;
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}
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