[En-Nut-Discussion] RENAME Routine

[ennut at thezachariasgroup.com]

  I wrote a RENAME routine for the PHAT File system. I needed one for 
the SDCARD.
I placed it at the end of nut\fs\pathops.c and added a reference to 
it in nut\include\sys\stat.h on my system. There may be a better place for it.
I do not have developer status so if someone with developer status 
wants to add this code, great. It would be nice to see it in a future version.

I thought I would share it.

   Thanks!
   Zack



/*!
  * \brief Rename a file.  Include file is nut\include\sys\stat.h
  *
  * \param pcOldName The name of a registered device, followed by a 
colon and a filename.
  * \param pcNewName The name of a registered device, followed by a 
colon and a filename.
  *
  * \return 0 for success or -1 to indicate an error.
  */
int rename(CONST char *pcOldName, CONST char *pcNewName)
{
   NUTDEVICE *dev;

   char cOldDeviceName[9];
   char cNewDeviceName[9];
   u_char nidx;
   char *nptr;


   int iReturnCode = -1;
   FSCP_RENAME fsFileRename; // Structure used for renaming files.

   //  Extract Old File's device name.
   nptr            = (char *)pcOldName;

   for (nidx = 0; *nptr && *nptr != ':' && nidx < 8; nidx++, nptr++)
   {
     cOldDeviceName[nidx] = *nptr;
   }

   cOldDeviceName[nidx] = 0;

   if (*nptr++ == ':') // Make sure a colon follows the Device Name
   {
     fsFileRename.par_old = nptr; // Assign the Old File's name to 
the File Rename structure

     //  Extract New device name.
     nptr            = (char *)pcNewName;

     for (nidx = 0; *nptr && *nptr != ':' && nidx < 8; nidx++, nptr++)
     {
       cNewDeviceName[nidx] = *nptr;
     }

     cNewDeviceName[nidx] = 0;

     if (*nptr++ == ':')  // Make sure a colon follows the Device Name
     {
       fsFileRename.par_new = nptr;  // Assign the New File's name to 
the File Rename structure

       if (stricmp(cNewDeviceName, cOldDeviceName) == 0) // Make sure 
both device names are the same
       {
         if ((dev = NutDeviceLookup(cOldDeviceName)) == 0) //  Get 
device structure of registered device.
         {
           errno = ENOENT;
         }
         else
         {
           iReturnCode = (*dev->dev_ioctl)(dev, FS_RENAME, 
(void*)&fsFileRename);
         }
       }
     }
   }

   return iReturnCode;
}