[common/client] platform: make filesystem access portable

client/tests/config_platform_test.c

@@ -0,0 +1,92 @@
+/**
+ * Looking Glass
+ * Copyright © 2017-2026 The Looking Glass Authors
+ * https://looking-glass.io
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program 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 General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc., 59
+ * Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "config_platform.h"
+#include "test.h"
+
+#include <pwd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#define MAX_PATHS 3U
+
+struct PathList
+{
+  char       * paths[MAX_PATHS];
+  unsigned int count;
+};
+
+const char * lgConfigDir(void)
+{
+  return "/test/config";
+}
+
+static bool collectPath(const char * path, void * opaque)
+{
+  struct PathList * paths = opaque;
+  CHECK(paths->count < MAX_PATHS);
+  paths->paths[paths->count] = strdup(path);
+  CHECK(paths->paths[paths->count]);
+  ++paths->count;
+  return true;
+}
+
+static bool stopAtFirstPath(const char * path, void * opaque)
+{
+  (void)path;
+  unsigned int * count = opaque;
+  ++*count;
+  return false;
+}
+
+static void testCandidates(void)
+{
+  struct PathList paths = { 0 };
+  CHECK(config_platformVisitDefaultFiles(collectPath, &paths));
+  CHECK(paths.count == MAX_PATHS);
+  CHECK(strcmp(paths.paths[0], "/etc/looking-glass-client.ini") == 0);
+
+  const struct passwd * password = getpwuid(getuid());
+  CHECK(password);
+
+  const size_t homeLength = strlen(password->pw_dir);
+  const char   suffix[]   = "/.looking-glass-client.ini";
+  char       * expected   = malloc(homeLength + sizeof(suffix));
+  CHECK(expected);
+  memcpy(expected, password->pw_dir, homeLength);
+  memcpy(expected + homeLength, suffix, sizeof(suffix));
+  CHECK(strcmp(paths.paths[1], expected) == 0);
+  CHECK(strcmp(paths.paths[2], "/test/config/client.ini") == 0);
+
+  free(expected);
+  for (unsigned int i = 0; i < paths.count; ++i)
+    free(paths.paths[i]);
+
+  unsigned int count = 0;
+  CHECK(!config_platformVisitDefaultFiles(stopAtFirstPath, &count));
+  CHECK(count == 1);
+}
+
+int main(void)
+{
+  testCandidates();
+  return 0;
+}