Add a path parsing mechanism

Now the system can parse paths to files/directories.

It follows the same Unix standard namespace.

For now, only absolute paths are allowed.

The parse mechanism relies on the struct path_part. Which represents
each component on a single path.

All the components are chain-linked through path_part->next, where the
last path component will have ->next == NULL.

This also introduces path_root struct, which represents the root of
the path.

The first component, linked to path_root->head, is always the "/" component.

The disk_id represents the disk the root directory is found into. This
should actually (and likely will) be a mountpoint not a disk id.

Signed-off-by: Carlos Maiolino <[email protected]>

2 files changed, 29 insertions, 0 deletions

diff --git a/src/include/fs/path.h b/src/include/fs/path.h
new file mode 100644
index 0000000..369e8b0
--- /dev/null
+++ b/src/include/fs/path.h
@@ -0,0 +1,25 @@
+#ifndef PATH_H
+#define PATH_H
+
+/*
+ * Path structure follows unix format:
+ *
+ * /foo/bar/file
+ *
+ */
+
+struct path_part {
+	const char		*name;
+	struct path_part	*next;
+};
+
+/* head is a linked list of all path components.
+ * the '/' is a component itself with name == NULL
+ */
+struct path_root {
+	int			disk_id;
+	struct path_part	*head;
+};
+
+struct path_root * parse_path(char *path);
+#endif /* PATH_H */
diff --git a/src/include/toxic/config.h b/src/include/toxic/config.h
index c1c1e7f..593eb2a 100644
--- a/src/include/toxic/config.h
+++ b/src/include/toxic/config.h
@@ -9,4 +9,8 @@
 #define PAGE_SIZE		(4096)
 
 #define SECTOR_SIZE		(512)
+
+/* Path parsing */
+#define PATH_MAX		(128)
+
 #endif /* CONFIG_H */