Changeset 260 for soft/giet_vm

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.

Location:

soft/giet_vm

Files:

• giet_fat32/fat32.c (modified) (1 diff)
• giet_fat32/fat32.h (modified) (1 diff)
• giet_kernel/sys_handler.c (modified) (1 diff)
• giet_libs/stdio.c (modified) (1 diff)
• giet_libs/stdio.h (modified) (2 diffs)

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. 
 /////////////////////////////////////////////////////////////////////////////////

soft/giet_vm/giet_fat32/fat32.h

@@ -174 +174 @@
                        unsigned int offset );     // offset sector in file
 
+extern int _fat_fstat( unsigned int fd_id );      // file descriptor index
+
 extern int _fat_close( unsigned int fd_id );      // file descriptor index
 

soft/giet_vm/giet_kernel/sys_handler.c

@@ -67 +67 @@
     &_fat_user_write,      /* 0x22 */
     &_fat_user_lseek,      /* 0x23 */
-    &_fat_close,           /* 0x24 */
-    &_sys_ukn,             /* 0x25 */
+    &_fat_fstat,           /* 0x24 */
+    &_fat_close,           /* 0x25 */
     &_sys_ukn,             /* 0x26 */
     &_sys_ukn,             /* 0x27 */

soft/giet_vm/giet_libs/stdio.c

@@ -744 +744 @@
                      0 );
 }
+
+///////////////////////////////////////////////////////////////////////////////////
+// giet_fat_fstat()
+///////////////////////////////////////////////////////////////////////////////////
+// Return stats of a file identified by "fd". 
+// (Only the file_size in sectors for this moment)
+///////////////////////////////////////////////////////////////////////////////////
+int giet_fat_fstat( unsigned int fd )
+{
+    return sys_call( SYSCALL_FAT_FSTAT,
+                     fd,
+                     0, 0, 0 );
+}
+
 ///////////////////////////////////////////////////////////////////////////////////
 // giet_fat_close()

soft/giet_vm/giet_libs/stdio.h

@@ -50 +50 @@
 #define SYSCALL_FAT_WRITE         0x22
 #define SYSCALL_FAT_LSEEK         0x23
-#define SYSCALL_FAT_CLOSE         0x24
+#define SYSCALL_FAT_FSTAT         0x24
+#define SYSCALL_FAT_CLOSE         0x25
 
 //////////////////////////////////////////////////////////////////////////////////
@@ -182 +183 @@
                            unsigned int whence );
 
+extern int giet_fat_fstat( unsigned int fd );
+
 extern int giet_fat_close( unsigned int fd );