flower/file-cookie.cc

   1
   2 #include <assert.h>
   3 #include <cstdio>
   4
   5 #include "memory-stream.hh"
   6
   7 extern "C" {
   8
   9   static bool
  10   is_memory_stream (void *foo)
  11   {
  12     Memory_out_stream *cookie = (Memory_out_stream *) foo;
  13     return dynamic_cast<Memory_out_stream *> (cookie);
  14   }
  15
  16   void *
  17   lily_fopencookie (void *cookie, char const *modes,
  18                     lily_cookie_io_functions_t io_funcs)
  19   {
  20     (void) cookie;
  21     (void) modes;
  22     (void) io_funcs;
  23     assert (is_memory_stream (cookie));
  24     return (FILE *) cookie;
  25   }
  26
  27   int
  28   lily_cookie_fclose (void *file)
  29   {
  30     assert (is_memory_stream (file));
  31     return Memory_out_stream::cleaner (file);
  32   }
  33
  34   int
  35   lily_cookie_fprintf (void *file, char const *format, ...)
  36   {
  37     assert (is_memory_stream (file));
  38     va_list ap;
  39     va_start (ap, format);
  40
  41     static char buf[65536];
  42     int i = vsnprintf (buf, sizeof (buf), format, ap);
  43     if (i == -1 || (unsigned) i > sizeof (buf))
  44       assert (false);
  45     va_end (ap);
  46     return Memory_out_stream::writer (file, buf, i);
  47   }
  48
  49   int
  50   lily_cookie_putc (int c, void *file)
  51   {
  52     assert (is_memory_stream (file));
  53     char buf[1];
  54     buf[0] = (char) c;
  55     return Memory_out_stream::writer (file, buf, 1);
  56   }
  57
  58 } /* extern C */