flower/file-cookie.cc

   1
   2 #include <cassert>
   3 #include <cstdio>
   4 using namespace std;
   5
   6 #include "memory-stream.hh"
   7
   8 extern "C" {
   9
  10   bool
  11   is_memory_stream (void *foo)
  12   {
  13     Memory_out_stream *cookie = (Memory_out_stream *) foo;
  14     return dynamic_cast<Memory_out_stream *> (cookie);
  15   }
  16
  17   void *
  18   lily_fopencookie (void *cookie,
  19                     char const * /* modes */,
  20                     lily_cookie_io_functions_t /* io_funcs */)
  21   {
  22     assert (is_memory_stream (cookie));
  23     return (FILE *) cookie;
  24   }
  25
  26   int
  27   lily_cookie_fclose (void *file)
  28   {
  29     assert (is_memory_stream (file));
  30     return Memory_out_stream::cleaner (file);
  31   }
  32
  33   int
  34   lily_cookie_fprintf (void *file, char const *format, ...)
  35   {
  36     assert (is_memory_stream (file));
  37     va_list ap;
  38     va_start (ap, format);
  39
  40     static char buf[65536];
  41     int i = vsnprintf (buf, sizeof (buf), format, ap);
  42     if (i == -1 || (unsigned) i > sizeof (buf))
  43       assert (false);
  44     va_end (ap);
  45     return Memory_out_stream::writer (file, buf, i);
  46   }
  47
  48   int
  49   lily_cookie_putc (int c, void *file)
  50   {
  51     assert (is_memory_stream (file));
  52     char buf[1];
  53     buf[0] = (char) c;
  54     return Memory_out_stream::writer (file, buf, 1);
  55   }
  56 } /* extern C */