demo/demo.c

   1 /* ADG - Automatic Drawing Generation
   2  * Copyright (C) 2007-2021  Nicola Fontana <ntd at entidi.it>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library 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 GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17  * Boston, MA  02110-1301, USA.
  18  */
  19
  20 #include "demo.h"
  21 #include <string.h>
  22
  23
  24 #if GLIB_CHECK_VERSION(2, 58, 0)
  25
  26 static gchar *
  27 _demo_absolutepath(const gchar *path)
  28 {
  29     return g_canonicalize_filename(path, NULL);
  30 }
  31
  32 #else
  33
  34 #include <limits.h>
  35 #include <stdlib.h>
  36
  37 static gchar *
  38 _demo_absolutepath(const gchar *path)
  39 {
  40     char abspath[PATH_MAX];
  41     return g_strdup(realpath(path, abspath));
  42 }
  43
  44 #endif
  45
  46
  47 /* Base folder all installed files should be referred to. */
  48 static gchar *pkg_data_dir = NULL;
  49
  50
  51 static gchar *
  52 _demo_basedir(const gchar *program)
  53 {
  54     gchar *dir, *absdir;
  55
  56     dir = g_path_get_dirname(program);
  57     if (dir == NULL) {
  58         return NULL;
  59     }
  60
  61     absdir = _demo_absolutepath(dir);
  62     g_free(dir);
  63     return absdir;
  64 }
  65
  66 void
  67 _demo_init(gint argc, gchar *argv[])
  68 {
  69     gchar *basedir;
  70
  71     if (argc < 1 || argv == NULL || argv[0] == NULL) {
  72         g_error(_("Invalid arguments: arg[0] not set"));
  73         g_assert_not_reached();
  74     }
  75
  76     basedir = _demo_basedir(argv[0]);
  77     if (basedir == NULL) {
  78         /* This should never happen but... just in case */
  79         pkg_data_dir = ".";
  80         return;
  81     }
  82
  83     g_print("basedir = '%s'\nbuilddir= '%s'\n", basedir, BUILDDIR);
  84     if (! g_str_has_prefix(basedir, BUILDDIR)) {
  85         /* Installed program: set pkg_data_dir */
  86 #ifdef G_OS_WIN32
  87         gchar *parent = g_path_get_dirname(dirname);
  88         /* XXX: `pkg_data_dir` will be leaked... who cares? */
  89         pkg_data_dir = g_build_filename(parent, PKGDATADIR, NULL);
  90         g_free(parent);
  91 #else
  92         pkg_data_dir = PKGDATADIR;
  93 #endif
  94     }
  95     g_free(basedir);
  96 }
  97
  98 gchar *
  99 _demo_file(const gchar *file_name)
 100 {
 101     if (pkg_data_dir == NULL) {
 102         /* Running uninstalled: look up the file in BUILDDIR first and
 103          * SRCDIR later, returning the first match */
 104         return adg_find_file(file_name, BUILDDIR, SRCDIR, NULL);
 105     }
 106
 107     /* Running installed: look up the file only in `pkg_data_dir` */
 108     return adg_find_file(file_name, pkg_data_dir, NULL);
 109 }