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, char const *modes,
  19                     lily_cookie_io_functions_t io_funcs)
  20   {
  21     (void) cookie;
  22     (void) modes;
  23     (void) io_funcs;
  24     assert (is_memory_stream (cookie));
  25     return (FILE *) cookie;
  26   }
  27
  28   int
  29   lily_cookie_fclose (void *file)
  30   {
  31     assert (is_memory_stream (file));
  32     return Memory_out_stream::cleaner (file);
  33   }
  34
  35   int
  36   lily_cookie_fprintf (void *file, char const *format, ...)
  37   {
  38     assert (is_memory_stream (file));
  39     va_list ap;
  40     va_start (ap, format);
  41
  42     static char buf[65536];
  43     int i = vsnprintf (buf, sizeof (buf), format, ap);
  44     if (i == -1 || (unsigned) i > sizeof (buf))
  45       assert (false);
  46     va_end (ap);
  47     return Memory_out_stream::writer (file, buf, i);
  48   }
  49
  50   int
  51   lily_cookie_putc (int c, void *file)
  52   {
  53     assert (is_memory_stream (file));
  54     char buf[1];
  55     buf[0] = (char) c;
  56     return Memory_out_stream::writer (file, buf, 1);
  57   }
  58 } /* extern C */