심심하니 fread, fwrite, fseek, ftell 구현. (Windows)

포레 2012. 10. 21. 19:10

# fread

size_t __cdecl fread( void *buffer, size_t size, size_t count, FILE *stream){
unsigned long ul_rs = 0; //unsigned long return size
ReadFile( (HANDLE)_get_osfhandle(stream->_file),
     buffer,
     count*size,
     &ul_rs,
     NULL) );
  return (size_t)ul_rs;
}

# fwrite

size_t __cdecl fwrite( void *buffer, size_t size, size_t count, FILE *stream){
unsigned long ul_rs = 0; //unsigned long return size
WriteFile( (HANDLE)_get_osfhandle(stream->_file),
    buffer,
    count*size,
    &ul_rs,
    NULL) );
return (size_t)ul_rs;
}

# fseek

#define SEEK_SET FILE_BEGIN
#define SEEK_CUR FILE_CURRENT
#define SEEK_END FILE_END

int __cdecl fseek( FILE *stream, long offset, int origin ){
return (SetFilePointer(_get_osfhandle(stream->_file),offset,origin))0:(int)GetLastError();
}

# ftell

int __cdecl ftell(FILE *stream){
return (int) SetFilePointer(_get_osfhandle(stream->_file),0,FILE_CURRENT);
}