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-rw-r--r--gl/lib/canonicalize.h58
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diff --git a/gl/lib/canonicalize.h b/gl/lib/canonicalize.h
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+/* Return the canonical absolute name of a given file.
+ Copyright (C) 1996-2007, 2009-2022 Free Software Foundation, Inc.
+
+ 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 3 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, see <https://www.gnu.org/licenses/>. */
+
+#ifndef CANONICALIZE_H_
+# define CANONICALIZE_H_
+
+#include <stdlib.h> /* for canonicalize_file_name */
+
+#define CAN_MODE_MASK (CAN_EXISTING | CAN_ALL_BUT_LAST | CAN_MISSING)
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+enum canonicalize_mode_t
+ {
+ /* All components must exist. */
+ CAN_EXISTING = 0,
+
+ /* All components excluding last one must exist. */
+ CAN_ALL_BUT_LAST = 1,
+
+ /* No requirements on components existence. */
+ CAN_MISSING = 2,
+
+ /* Don't expand symlinks. */
+ CAN_NOLINKS = 4
+ };
+typedef enum canonicalize_mode_t canonicalize_mode_t;
+
+/* Return the canonical absolute name of file NAME, while treating
+ missing elements according to CAN_MODE. A canonical name
+ does not contain any `.', `..' components nor any repeated file name
+ separators ('/') or, depending on other CAN_MODE flags, symlinks.
+ Whether components must exist or not depends on canonicalize mode.
+ The result is malloc'd.
+ Upon failure, return NULL with errno set. */
+char *canonicalize_filename_mode (const char *, canonicalize_mode_t)
+ _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_DEALLOC_FREE;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* !CANONICALIZE_H_ */