Preparation for "current directory" handling, not finished.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@15244 27425a3e-05d8-49a3-a47f-9c15f0e5edd8

os/vfs/drivers/overlay/drvoverlay.c

@@ -45,6 +45,8 @@
 /* Module local variables.                                                   */
 /*===========================================================================*/
 
+static msg_t drv_set_cwd(void *instance, const char *path);
+static msg_t drv_get_cwd(void *instance, char *buf, size_t size);
 static msg_t drv_open_dir(void *instance,
                           const char *path,
                           vfs_directory_node_c **vdnpp);
@@ -54,6 +56,8 @@ static msg_t drv_open_file(void *instance,
                            vfs_file_node_c **vfnpp);
 
 static const struct vfs_overlay_driver_vmt driver_vmt = {
+  .set_cwd      = drv_set_cwd,
+  .get_cwd      = drv_get_cwd,
   .open_dir     = drv_open_dir,
   .open_file    = drv_open_file
 };
@@ -115,6 +119,17 @@ static msg_t match_driver(vfs_overlay_driver_c *odp,
   return err;
 }
 
+static const char *get_current_directory(vfs_overlay_driver_c *drvp) {
+  const char *cwd = drvp->path_cwd;
+
+  /* In case it has not yet been defined using root.*/
+  if (cwd == NULL) {
+    return "/";
+  }
+
+  return cwd;
+}
+
 static msg_t build_path(vfs_overlay_driver_c *drvp,
                         const char *path,
                         char *buf) {
@@ -126,11 +141,38 @@ static msg_t build_path(vfs_overlay_driver_c *drvp,
     VFS_RETURN_ON_ERROR(vfs_path_append(buf, drvp->path_prefix));
   }
 
+  /* If it is a relative path then we need to consider the current directory.*/
+  if (!vfs_parse_is_separator(*path)) {
+
+    /* Adding the current directory, note, it is already a normalized
+       path, no need to re-normalize.*/
+    VFS_RETURN_ON_ERROR(vfs_path_append(buf, get_current_directory(drvp)));
+  }
+
+  /* Finally adding the path requested by the user.*/
   VFS_RETURN_ON_ERROR(vfs_path_append(buf, path));
 
   return VFS_RET_SUCCESS;
 }
 
+static msg_t drv_set_cwd(void *instance, const char *path) {
+
+  (void) instance;
+  (void) path;
+
+  return VFS_RET_NOT_IMPLEMENTED;
+}
+
+static msg_t drv_get_cwd(void *instance, char *buf, size_t size) {
+
+  (void) instance;
+  (void) size;
+
+  strcpy(buf, "/");
+
+  return VFS_RET_SUCCESS;
+}
+
 static msg_t drv_open_dir(void *instance,
                           const char *path,
                           vfs_directory_node_c **vdnpp) {
@@ -363,6 +405,7 @@ vfs_driver_c *drvOverlayObjectInit(vfs_overlay_driver_c *vodp,
   vodp->rootname     = rootname;
   vodp->overlaid_drv = overlaid_drv;
   vodp->path_prefix  = path_prefix;
+  vodp->path_cwd     = NULL;
   vodp->next_driver  = 0U;
 
   return (vfs_driver_c *)vodp;

os/vfs/drivers/overlay/drvoverlay.h

@@ -111,6 +111,8 @@ typedef struct vfs_overlay_dir_node {
   vfs_driver_c                      *overlaid_drv;                          \
   /* Path prefix for the overlaid driver or NULL.*/                         \
   const char                        *path_prefix ;                          \
+  /* Current directory or NULL.*/                                           \
+  const char                        *path_cwd;                              \
   /* Next registration slot.*/                                              \
   unsigned                          next_driver;                            \
   /* Registration slots.*/                                                  \

os/vfs/include/vfsdrivers.h

@@ -67,6 +67,8 @@
  */
 #define __vfs_driver_methods                                                \
   __base_object_methods                                                     \
+  msg_t (*set_cwd)(void *instance, const char *path);                       \
+  msg_t (*get_cwd)(void *instance, char *buf, size_t size);                 \
   msg_t (*open_dir)(void *instance,                                         \
                     const char *path,                                       \
                     vfs_directory_node_c **vdnpp);                          \

os/vfs/include/vfserrors.h

@@ -38,21 +38,6 @@
  * @name    Error codes compatible with HAL and Posix
  * @{
  */
-#if 0
-#define VFS_RET_SUCCESS         0
-#define VFS_RET_TIMEOUT         -1
-#define VFS_RET_EOF             -2
-#define VFS_RET_NOT_IMPLEMENTED -3
-#define VFS_RET_NO_RESOURCE     -4
-#define VFS_RET_NO_DRIVER       -5
-#define VFS_RET_INVALID_PATH    -6
-#define VFS_RET_NOT_FOUND       -7
-#define VFS_RET_EXIST           -8
-#define VFS_RET_ACCESS_DENIED   -9
-#define VFS_RET_MEDIA_ERROR     -10
-#define VFS_RET_INNER_ERROR     -11
-#define VFS_RET_INVALID_MODE    -12
-#endif
 #define VFS_RET_SUCCESS         0               /* Success */
 #define VFS_RET_TIMEOUT         -1              /* Timeout */
 #define VFS_RET_EOF             -2              /* End-of-file */