Function VolNameToFirstName

Libraries/unrar/pathfn.cpp:627–678

Get the name of first volume. Return the leftmost digit of volume number.

#if !defined(SFX_MODULE)
// Get the name of first volume. Return the leftmost digit of volume number.
wchar* VolNameToFirstName(const wchar *VolName,wchar *FirstName,size_t MaxSize,bool NewNumbering)
{
  if (FirstName!=VolName)
    wcsncpyz(FirstName,VolName,MaxSize);
  wchar *VolNumStart=FirstName;
  if (NewNumbering)
  {
    wchar N='1';

    // From the rightmost digit of volume number to the left.
    for (wchar *ChPtr=GetVolNumPart(FirstName);ChPtr>FirstName;ChPtr--)
      if (IsDigit(*ChPtr))
      {
        *ChPtr=N; // Set the rightmost digit to '1' and others to '0'.
        N='0';
      }
      else
        if (N=='0')
        {
          VolNumStart=ChPtr+1; // Store the position of leftmost digit in volume number.
          break;
        }
  }
  else
  {
    // Old volume numbering scheme. Just set the extension to ".rar".
    SetExt(FirstName,L"rar",MaxSize);
    VolNumStart=GetExt(FirstName);
  }
  if (!FileExist(FirstName))
  {
    // If the first volume, which name we just generated, is not exist,
    // check if volume with same name and any other extension is available.
    // It can help in case of *.exe or *.sfx first volume.
    wchar Mask[NM];
    wcsncpyz(Mask,FirstName,ASIZE(Mask));
    SetExt(Mask,L"*",ASIZE(Mask));
    FindFile Find;
    Find.SetMask(Mask);
    FindData FD;
    while (Find.Next(&FD))
    {
      Archive Arc;
      if (Arc.Open(FD.Name,0) && Arc.IsArchive(true) && Arc.FirstVolume)
      {
        wcsncpyz(FirstName,FD.Name,MaxSize);
        break;
      }
    }
  }
  return VolNumStart;
}
#endif