1 files changed, 79 insertions, 0 deletions
diff --git a/os.h b/os.h
new file mode 100644
index 0000000..ebf0317
--- /dev/null
+++ b/os.h
@@ -0,0 +1,79 @@
+#ifndef OS_H_
+#define OS_H_
+
+typedef enum {
+	FS_NON_EXISTENT,
+	FS_FILE,
+	FS_DIRECTORY,
+	FS_OTHER
+} FsType;
+
+enum {
+	FS_PERMISSION_READ = 0x01,
+	FS_PERMISSION_WRITE = 0x02,
+};
+typedef u8 FsPermission;
+
+typedef struct {
+	FsType type;
+	char name[];
+} FsDirectoryEntry;
+
+// returns what kind of thing this is.
+FsType fs_path_type(char const *path);
+FsPermission fs_path_permission(char const *path);
+// Does this file exist? Returns false for directories.
+bool fs_file_exists(char const *path);
+// Returns a NULL-terminated array of the files/directories in this directory, or NULL if the directory does not exist/out of memory.
+// When you're done with the entries, call fs_dir_entries_free (or call free on each entry, then on the whole array).
+// NOTE: The files/directories aren't returned in any particular order!
+FsDirectoryEntry **fs_list_directory(char const *dirname);
+// Create the directory specified by `path`
+// Returns:
+// 1  if the directory was created successfully
+// 0  if the directory already exists
+// -1 if the path already exists, but it's not a directory, or if there's another error (e.g. don't have permission to create directory).
+int fs_mkdir(char const *path);
+// Puts the current working directory into buf, including a null-terminator, writing at most buflen bytes.
+// Returns:
+// 1  if the working directory was inserted into buf successfully
+// 0  if buf is too short to hold the cwd
+// -1 if we can't get the cwd for whatever reason.
+int fs_get_cwd(char *buf, size_t buflen);
+struct timespec time_last_modified(char const *filename);
+struct timespec time_get(void);
+// sleep for a certain number of nanoseconds
+void time_sleep_ns(u64 ns);
+
+
+// free the entries generated by fs_list_directory.
+static void fs_dir_entries_free(FsDirectoryEntry **entries) {
+	for (int i = 0; entries[i]; ++i)
+		free(entries[i]);
+	free(entries);
+}
+
+static double time_get_seconds(void) {
+	return timespec_to_seconds(time_get());
+}
+
+
+
+// sleep for microseconds
+static void time_sleep_us(u64 us) {
+	time_sleep_ns(us * 1000);
+}
+
+// sleep for milliseconds
+static void time_sleep_ms(u64 ms) {
+	time_sleep_ns(ms * 1000000);
+}
+
+// sleep for seconds
+static void time_sleep_s(u64 s) {
+	time_sleep_ns(s * 1000000000);
+}
+
+
+#endif // OS_H_
+