From 975665ffa644808c9f8c383dae6094e285ba7f1b Mon Sep 17 00:00:00 2001
From: Zhiyuan Shao <zyshao@hust.edu.cn>
Date: Wed, 8 Feb 2023 08:53:16 +0800
Subject: [PATCH] revise app and user lib

---
 user/app_relativepath.c | 11 +++++++++++
 user/user_lib.c         | 14 ++++++++++++++
 user/user_lib.h         |  2 ++
 3 files changed, 27 insertions(+)

diff --git a/user/app_relativepath.c b/user/app_relativepath.c
index 2c7fa7e..0787c4c 100644
--- a/user/app_relativepath.c
+++ b/user/app_relativepath.c
@@ -2,6 +2,17 @@
 #include "util/string.h"
 #include "util/types.h"
 
+void pwd() {
+  char path[30];
+  read_cwd(path);
+  printu("cwd:%s\n", path);
+}
+
+void cd(const char *path) {
+  if (change_cwd(path) != 0)
+    printu("cd failed\n");
+}
+
 int main(int argc, char *argv[]) {
   int fd;
   int MAXBUF = 512;
diff --git a/user/user_lib.c b/user/user_lib.c
index 1c4f6d1..8eb160a 100644
--- a/user/user_lib.c
+++ b/user/user_lib.c
@@ -167,3 +167,17 @@ int unlink_u(const char *fn){
 int close(int fd) {
   return do_user_call(SYS_user_close, fd, 0, 0, 0, 0, 0, 0);
 }
+
+//
+// lib call to read present working directory (pwd)
+//
+int read_cwd(char *path) {
+  return do_user_call(SYS_user_rcwd, (uint64)path, 0, 0, 0, 0, 0, 0);
+}
+
+//
+// lib call to change pwd
+//
+int change_cwd(const char *path) {
+  return do_user_call(SYS_user_ccwd, (uint64)path, 0, 0, 0, 0, 0, 0);
+}
diff --git a/user/user_lib.h b/user/user_lib.h
index 95a686d..aa678e7 100644
--- a/user/user_lib.h
+++ b/user/user_lib.h
@@ -33,5 +33,7 @@ int closedir_u(int fd);
 int link_u(const char *fn1, const char *fn2);
 int unlink_u(const char *fn);
 
+int read_cwd(char *path);
+int change_cwd(const char *path);
 
 #endif
-- 
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