source/io/unix/seekable.cpp

   1 #define _LARGEFILE64_SOURCE
   2 #include <cerrno>
   3 #include <unistd.h>
   4 #include <msp/core/systemerror.h>
   5 #include "handle.h"
   6 #include "handle_private.h"
   7 #include "seekable.h"
   8
   9 using namespace std;
  10
  11 namespace {
  12
  13 using namespace Msp::IO;
  14
  15 int sys_seek_type(SeekType st)
  16 {
  17         if(st==S_BEG)
  18                 return SEEK_SET;
  19         else if(st==S_CUR)
  20                 return SEEK_CUR;
  21         else if(st==S_END)
  22                 return SEEK_END;
  23
  24         throw invalid_argument("sys_seek_type");
  25 }
  26
  27 }
  28
  29 namespace Msp {
  30 namespace IO {
  31
  32 SeekOffset sys_seek(Handle &handle, SeekOffset offset, SeekType type)
  33 {
  34         off64_t ret = lseek64(*handle, offset, sys_seek_type(type));
  35         if(ret==(off64_t)-1)
  36         {
  37                 if(errno==EINVAL)
  38                         throw bad_seek(offset, type);
  39                 else
  40                         throw system_error("lseek64");
  41         }
  42
  43         return ret;
  44 }
  45
  46 } // namespace IO
  47 } // namespace Msp