Changeset 260 for soft/giet_vm/giet_fat32/fat32.c

Timestamp:

Dec 9, 2013, 5:26:37 PM (11 years ago)

Author:

devigne

Message:

Add a new syscall : giet_fat_fstat, allowing to a user application to know the
size (in sectors) of an open file.

File:

• soft/giet_vm/giet_fat32/fat32.c (modified) (1 diff)

soft/giet_vm/giet_fat32/fat32.c

@@ -1309 +1309 @@
 
 /////////////////////////////////////////////////////////////////////////////////
+// Return stats of a file identified by "fd". 
+// (Only the file_size in sectors for this moment)
+/////////////////////////////////////////////////////////////////////////////////
+// Returns file size (on sectors) on success, -1 on failure.
+/////////////////////////////////////////////////////////////////////////////////
+int _fat_fstat( unsigned int fd_id )
+{
+    unsigned int file_size    = 0;
+    unsigned int file_sectors = 0;
+
+    if( (fd_id < GIET_OPEN_FILES_MAX) )
+    {
+        file_size = fat.fd[fd_id].file_size;
+
+        if ( file_size & 0x1FF ) file_sectors = (file_size >> 9) + 1;
+        else                     file_sectors = (file_size >> 9); 
+
+        return file_sectors;
+    }
+    else
+    {
+        _tty_get_lock( 0 );
+        _puts("\n[FAT ERROR] in _fat_fstat() : illegal file descriptor index\n");
+        _tty_release_lock( 0 );
+        return -1;
+    } 
+} // end _fat_fstat()
+
+/////////////////////////////////////////////////////////////////////////////////
 // Close the file identified by the file_descriptor index. 
 /////////////////////////////////////////////////////////////////////////////////