Prepare for radical source tree reorganization. zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 144 insertions, 0 deletions

diff --git a/REORG.TODO/mach/devstream.c b/REORG.TODO/mach/devstream.c
new file mode 100644
index 0000000000..1a9e207b47
--- /dev/null
+++ b/REORG.TODO/mach/devstream.c
@@ -0,0 +1,144 @@
+/* stdio on a Mach device port.
+   Translates \n to \r\n on output, echos and translates \r to \n on input.
+   Copyright (C) 1992-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <stdio.h>
+#include <mach.h>
+#include <device/device.h>
+#include <errno.h>
+#include <string.h>
+
+
+static ssize_t
+devstream_write (void *cookie, const char *buffer, size_t n)
+{
+  const device_t dev = (device_t) cookie;
+
+  int write_some (const char *p, size_t to_write)
+    {
+      kern_return_t err;
+      int wrote;
+      int thiswrite;
+
+      while (to_write > 0)
+	{
+	  thiswrite = to_write;
+	  if (thiswrite > IO_INBAND_MAX)
+	    thiswrite = IO_INBAND_MAX;
+
+	  if (err = device_write_inband (dev, 0, 0, p, thiswrite, &wrote))
+	    {
+	      errno = err;
+	      return 0;
+	    }
+	  p += wrote;
+	  to_write -= wrote;
+	}
+      return 1;
+    }
+  int write_crlf (void)
+    {
+      static const char crlf[] = "\r\n";
+      return write_some (crlf, 2);
+    }
+
+  /* Search for newlines (LFs) in the buffer.  */
+
+  const char *start = buffer, *p;
+  while ((p = memchr (start, '\n', n)) != NULL)
+    {
+      /* Found one.  Write out through the preceding character,
+	 and then write a CR/LF pair.  */
+
+      if ((p > start && !write_some (start, p - start))
+	  || !write_crlf ())
+	return (start - buffer) ?: -1;
+
+      n -= p + 1 - start;
+      start = p + 1;
+    }
+
+  /* Write the remainder of the buffer.  */
+  if (write_some (start, n))
+    start += n;
+  return (start - buffer) ?: -1;
+}
+
+static ssize_t
+devstream_read (void *cookie, char *buffer, size_t to_read)
+{
+  const device_t dev = (device_t) cookie;
+
+  kern_return_t err;
+  mach_msg_type_number_t nread = to_read;
+
+  err = device_read_inband (dev, 0, 0, to_read, buffer, &nread);
+  if (err)
+    {
+      errno = err;
+      return -1;
+    }
+
+  /* Translate CR to LF.  */
+  {
+    char *p;
+    for (p = memchr (buffer, '\r', nread); p;
+	 p = memchr (p + 1, '\r', (buffer + nread) - (p + 1)))
+      *p = '\n';
+  }
+
+  /* Echo back what we read.  */
+  (void) devstream_write (cookie, buffer, nread);
+
+  return nread;
+}
+
+static int
+dealloc_ref (void *cookie)
+{
+  if (mach_port_deallocate (mach_task_self (), (mach_port_t) cookie))
+    {
+      errno = EINVAL;
+      return -1;
+    }
+  return 0;
+}
+
+FILE *
+mach_open_devstream (mach_port_t dev, const char *mode)
+{
+  FILE *stream;
+
+  if (mach_port_mod_refs (mach_task_self (), dev, MACH_PORT_RIGHT_SEND, 1))
+    {
+      errno = EINVAL;
+      return NULL;
+    }
+
+  stream = fopencookie ((void *) dev, mode,
+			(cookie_io_functions_t) { write: devstream_write,
+						  read: devstream_read,
+						  close: dealloc_ref });
+  if (stream == NULL)
+    {
+      mach_port_deallocate (mach_task_self (), dev);
+      return NULL;
+    }
+
+  return stream;
+}