Recreate repo

action.c

@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: GPL-3.0-only */
+/* SPDX-FileCopyrightText: 2026 afiw <afiw@linuxposting.xyz> */
+
+/*
+ * can - query filesystem permissions
+ * Copyright (C) 2026 afiw <afiw@linuxposting.xyz>
+ *
+ * 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, exclusively version 3 of the License.
+ *
+ * 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, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <errno.h>
+#include <string.h>
+#include <sys/stat.h>
+#include "action.h"
+
+int action_of_cstring(char const* cstring) {
+  if (strcmp(cstring, "read") == 0) {
+    return ACTION_READ; }
+  else if (strcmp(cstring, "write") == 0) {
+    return ACTION_WRITE; }
+  else if (strcmp(cstring, "edit") == 0) {
+    return ACTION_WRITE; }
+  else if (strcmp(cstring, "execute") == 0) {
+    return ACTION_EXECUTE; }
+  else if (strcmp(cstring, "run") == 0) {
+    return ACTION_EXECUTE; }
+  errno = EINVAL;
+  return -1; }
+
+mode_t user_bit_of_action(enum action action) {
+  return (mode_t[]){ [ACTION_READ] = S_IRUSR,
+                     [ACTION_WRITE] = S_IWUSR,
+                     [ACTION_EXECUTE] = S_IXUSR }[action]; }
+
+mode_t group_bit_of_action(enum action action) {
+  return (mode_t[]){ [ACTION_READ] = S_IRGRP,
+                     [ACTION_WRITE] = S_IWGRP,
+                     [ACTION_EXECUTE] = S_IXGRP }[action]; }
+
+mode_t other_bit_of_action(enum action action) {
+  return (mode_t[]){ [ACTION_READ] = S_IROTH,
+                     [ACTION_WRITE] = S_IWOTH,
+                     [ACTION_EXECUTE] = S_IXOTH }[action]; }