Introduce crealpath

crealpath (for "custom realpath") is a custom implementation of
realpath(3) that aims to work similarly to GNU's realpath(1). This
implementation is provided due to the following reasons:

- Future commits will require extracting an absolute path from a
  relative path, and/or process relative components from a path, such as
".." or ".".
- realpath(3) is defined by POSIX.1-2008 as a XSI extension, and
  extensions are generally avoided in this repository whenever possible.
- Additionally, realpath(3) requires the file or directory pointed to by
the path to exist, which might not always be the case for slcl.
- auth.c uses its own implementation to extract a dynamically allocated
string by repeatedly calling getcwd(3). Future commits will also
require this future, so it makes sense to keep it on a separate
component.

1 files changed, 8 insertions, 0 deletions

diff --git a/crealpath.h b/crealpath.h
new file mode 100644
index 0000000..8a178c4
--- /dev/null
+++ b/crealpath.h
@@ -0,0 +1,8 @@
+#ifndef CREALPATH_H
+#define CREALPATH_H
+
+/* Custom implementation of a GNU's realpath(1)-like function that
+ * does not require GNU extensions. */
+char *crealpath(const char *path);
+
+#endif