added dir_setCurrent, dir_getCurrent

include/tlibc/filesystem.h

@@ -31,6 +31,8 @@
     #define path_notseps "\\"
 #endif
 
+#define path_max_len 1024
+
 // @brief replaces path_notsep with path_sep
 void path_fix_separators(str* path);
 
@@ -162,3 +164,7 @@ Result(bool) dir_create(cstr path);
 /// EXAMPLE: dir_createParent("a/b/c") -> creates "a", "a/b"
 /// @return false if directory was present already, true if it has been created
 Result(bool) dir_createParent(cstr path);
+
+/// @return heap-allocated char array
+Result(char*) dir_getCurrent();
+Result(void) dir_setCurrent(cstr path);

src/filesystem/dir.c

@@ -64,3 +64,41 @@ Result(bool) dir_createParent(cstr path){
     try(bool result, i, dir_create(parent_dir_cstr));
     Return RESULT_VALUE(i, result);
 }
+
+Result(void) dir_setCurrent(cstr path){
+    int r = 
+#if TLIBC_FS_USE_WINDOWS_H
+    _chdir(path);
+#else
+    chdir(path);
+#endif
+    if(r != 0)
+    {
+        char* errno_s = strerror_malloc(errno);
+        char* err = sprintf_malloc(
+            "Can't set current dicectory to '%s': %s",
+            path, errno_s);
+        free(errno_s);
+        return RESULT_ERROR_HEAP(err);
+    }
+    return RESULT_VOID;
+}
+
+Result(char*) dir_getCurrent(){
+    char* buf = 
+#if TLIBC_FS_USE_WINDOWS_H
+    _getcwd(NULL, path_max_len);
+#else
+    getcwd(NULL, path_max_len);
+#endif
+    if(buf == NULL)
+    {
+        char* errno_s = strerror_malloc(errno);
+        char* err = sprintf_malloc(
+            "Can't get current dicectory: %s",
+            errno_s);
+        free(errno_s);
+        return RESULT_ERROR_HEAP(err);
+    }
+    return RESULT_VALUE(p, buf);
+}