Update Android port

* .gitignore: Add new files.
* INSTALL.android: Explain how to build Emacs for ancient
versions of Android.
* admin/merge-gnulib (GNULIB_MODULES): Add getdelim.
* build-aux/config.guess (timestamp, version):
* build-aux/config.sub (timestamp, version): Autoupdate.
* configure.ac (BUILD_DETAILS, ANDROID_MIN_SDK):
(ANDROID_STUBIFY): Allow specifying CFLAGS via ANDROID_CFLAGS.
Add new configure tests for Android API version when not
explicitly specified.

* doc/emacs/android.texi (Android): Add reference to ``Other
Input Devices''.
(Android File System): Remove restrictions on directory-files on
the assets directory.
* doc/emacs/emacs.texi (Top): Add Other Input Devices to menu.
* doc/emacs/input.texi (Other Input Devices): New node.
* doc/lispref/commands.texi (Touchscreen Events): Document
changes to touchscreen input events.
* doc/lispref/frames.texi (Pop-Up Menus): Likewise.
* etc/NEWS: Announce changes.
* java/Makefile.in: Use lib-src/asset-directory-tool to generate
an `directory-tree' file placed in /assets.
* java/debug.sh: Large adjustments to support Android 2.2 and
later.

* java/org/gnu/emacs/EmacsContextMenu.java (inflateMenuItems):
* java/org/gnu/emacs/EmacsCopyArea.java (perform):
* java/org/gnu/emacs/EmacsDialog.java (toAlertDialog):
* java/org/gnu/emacs/EmacsDrawLine.java (perform):
* java/org/gnu/emacs/EmacsDrawRectangle.java (perform):
* java/org/gnu/emacs/EmacsDrawable.java (EmacsDrawable):
* java/org/gnu/emacs/EmacsFillPolygon.java (perform):
* java/org/gnu/emacs/EmacsFillRectangle.java (perform):
* java/org/gnu/emacs/EmacsGC.java (EmacsGC):
* java/org/gnu/emacs/EmacsPixmap.java (EmacsPixmap):
(destroyHandle):
* java/org/gnu/emacs/EmacsSdk7FontDriver.java (draw): Avoid
redundant canvas saves and restores.
* java/org/gnu/emacs/EmacsService.java (run):
* java/org/gnu/emacs/EmacsView.java (EmacsView):
(handleDirtyBitmap):
* java/org/gnu/emacs/EmacsWindow.java (changeWindowBackground)
(EmacsWindow): Make compatible with Android 2.2 and later.

* lib-src/Makefile.in (DONT_INSTALL): Add asset-directory-tool
on Android.:(asset-directory-tool{EXEEXT}): New target.
* lib-src/asset-directory-tool.c (struct directory_tree, xmalloc)
(main_1, main_2, main): New file.

* lib, m4: Merge from gnulib.  This will be reverted before
merging to master.

* lisp/button.el (button-map):
(push-button):
* lisp/frame.el (display-popup-menus-p): Improve touchscreen
support.
* lisp/subr.el (event-start):
(event-end): Handle touchscreen events.
* lisp/touch-screen.el (touch-screen-handle-timeout):
(touch-screen-handle-point-update):
(touch-screen-handle-point-up):
(touch-screen-track-tap):
(touch-screen-track-drag):
(touch-screen-drag-mode-line-1):
(touch-screen-drag-mode-line): New functions.
([mode-line touchscreen-begin]):
([bottom-divider touchscreen-begin]): Bind new events.

* lisp/wid-edit.el (widget-event-point):
(widget-keymap):
(widget-event-start):
(widget-button--check-and-call-button):
(widget-button-click): Improve touchscreen support.

* src/alloc.c (make_lisp_symbol): Avoid ICE on Android NDK GCC.
(mark_pinned_symbols): Likewise.

* src/android.c (struct android_emacs_window): New struct.
(window_class): New variable.
(android_run_select_thread): Add workaround for Android platform
bug.
(android_extract_long, android_scan_directory_tree): New
functions.
(android_file_access_p): Use those functions instead.
(android_init_emacs_window): New function.
(android_init_emacs_gc_class): Update signature of `markDirty'.
(android_change_gc, android_set_clip_rectangles): Tell the GC
whether or not clip rects were dirtied.
(android_swap_buffers): Do not look up method every time.
(struct android_dir): Adjust for new directory tree lookup.
(android_opendir, android_readdir, android_closedir): Likewise.
(android_four_corners_bilinear): Fix coding style.
(android_ftruncate): New function.
* src/android.h: Update prototypes.  Replace ftruncate with
android_ftruncate when necessary.

* src/androidterm.c (handle_one_android_event): Pacify GCC.  Fix
touch screen tool bar bug.
* src/emacs.c (using_utf8): Fix compilation error.
* src/fileio.c (Ffile_system_info): Return Qnil when fsusage.o
is not built.
* src/filelock.c (BOOT_TIME_FILE): Fix definition for Android.
* src/frame.c (Fx_parse_geometry): Fix uninitialized variable
uses.
* src/keyboard.c (lispy_function_keys): Fix `back'.
* src/menu.c (x_popup_menu_1): Handle touch screen events.
(Fx_popup_menu): Document changes.

* src/sfnt.c (main): Improve tests.

* src/sfntfont-android.c (sfntfont_android_put_glyphs): Fix
minor problem.
(init_sfntfont_android): Check for
HAVE_DECL_ANDROID_GET_DEVICE_API_LEVEL.
* src/sfntfont.c (struct sfnt_font_desc): New fields `adstyle'
and `languages'.
(sfnt_parse_style): Append tokens to adstyle.
(sfnt_parse_languages): New function.
(sfnt_enum_font_1): Parse supported languages and adstyle.
(sfntfont_list_1): Handle new fields.
(sfntfont_text_extents): Fix uninitialized variable use.
(syms_of_sfntfont, mark_sfntfont): Adjust accordingly.

lib/getdelim.c

@@ -0,0 +1,147 @@
+/* getdelim.c --- Implementation of replacement getdelim function.
+   Copyright (C) 1994, 1996-1998, 2001, 2003, 2005-2023 Free Software
+   Foundation, Inc.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* Ported from glibc by Simon Josefsson. */
+
+/* Don't use __attribute__ __nonnull__ in this compilation unit.  Otherwise gcc
+   optimizes away the lineptr == NULL || n == NULL || fp == NULL tests below.  */
+#define _GL_ARG_NONNULL(params)
+
+#include <config.h>
+
+#include <stdio.h>
+
+#include <limits.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <errno.h>
+
+#ifndef SSIZE_MAX
+# define SSIZE_MAX ((ssize_t) (SIZE_MAX / 2))
+#endif
+
+#if USE_UNLOCKED_IO
+# include "unlocked-io.h"
+# define getc_maybe_unlocked(fp)        getc(fp)
+#elif !HAVE_FLOCKFILE || !HAVE_FUNLOCKFILE || !HAVE_DECL_GETC_UNLOCKED
+# undef flockfile
+# undef funlockfile
+# define flockfile(x) ((void) 0)
+# define funlockfile(x) ((void) 0)
+# define getc_maybe_unlocked(fp)        getc(fp)
+#else
+# define getc_maybe_unlocked(fp)        getc_unlocked(fp)
+#endif
+
+static void
+alloc_failed (void)
+{
+#if defined _WIN32 && ! defined __CYGWIN__
+  /* Avoid errno problem without using the realloc module; see:
+     https://lists.gnu.org/r/bug-gnulib/2016-08/msg00025.html  */
+  errno = ENOMEM;
+#endif
+}
+
+/* Read up to (and including) a DELIMITER from FP into *LINEPTR (and
+   NUL-terminate it).  *LINEPTR is a pointer returned from malloc (or
+   NULL), pointing to *N characters of space.  It is realloc'ed as
+   necessary.  Returns the number of characters read (not including
+   the null terminator), or -1 on error or EOF.  */
+
+ssize_t
+getdelim (char **lineptr, size_t *n, int delimiter, FILE *fp)
+{
+  ssize_t result;
+  size_t cur_len = 0;
+
+  if (lineptr == NULL || n == NULL || fp == NULL)
+    {
+      errno = EINVAL;
+      return -1;
+    }
+
+  flockfile (fp);
+
+  if (*lineptr == NULL || *n == 0)
+    {
+      char *new_lineptr;
+      *n = 120;
+      new_lineptr = (char *) realloc (*lineptr, *n);
+      if (new_lineptr == NULL)
+        {
+          alloc_failed ();
+          result = -1;
+          goto unlock_return;
+        }
+      *lineptr = new_lineptr;
+    }
+
+  for (;;)
+    {
+      int i;
+
+      i = getc_maybe_unlocked (fp);
+      if (i == EOF)
+        {
+          result = -1;
+          break;
+        }
+
+      /* Make enough space for len+1 (for final NUL) bytes.  */
+      if (cur_len + 1 >= *n)
+        {
+          size_t needed_max =
+            SSIZE_MAX < SIZE_MAX ? (size_t) SSIZE_MAX + 1 : SIZE_MAX;
+          size_t needed = 2 * *n + 1;   /* Be generous. */
+          char *new_lineptr;
+
+          if (needed_max < needed)
+            needed = needed_max;
+          if (cur_len + 1 >= needed)
+            {
+              result = -1;
+              errno = EOVERFLOW;
+              goto unlock_return;
+            }
+
+          new_lineptr = (char *) realloc (*lineptr, needed);
+          if (new_lineptr == NULL)
+            {
+              alloc_failed ();
+              result = -1;
+              goto unlock_return;
+            }
+
+          *lineptr = new_lineptr;
+          *n = needed;
+        }
+
+      (*lineptr)[cur_len] = i;
+      cur_len++;
+
+      if (i == delimiter)
+        break;
+    }
+  (*lineptr)[cur_len] = '\0';
+  result = cur_len ? cur_len : result;
+
+ unlock_return:
+  funlockfile (fp); /* doesn't set errno */
+
+  return result;
+}