Update.

1998-04-01 17:38  Ulrich Drepper  <drepper@cygnus.com>

	* iconv/gconv?simple.c: New builtins for UCS en/decoding.
	* iconv/gconv_builtin.h: Add definitions for new builtins.
	* iconv/gconv.h: Add prototypes for new builtins.

	* iconvdata/Makefile (modules): Add ISO646.
	Add rules for ISO646 module.
	(distribute): Add iso646.c.
	* iconvdata/gconv-modules: Add module and alias definition for
	ISO646 charsets.
	* iconvdata/iso646.c: New file.

1 files changed, 263 insertions, 0 deletions

diff --git a/iconvdata/iso646.c b/iconvdata/iso646.c
new file mode 100644
index 0000000..db0c089
--- /dev/null
+++ b/iconvdata/iso646.c
@@ -0,0 +1,263 @@
+/* Conversion to and from the various ISO 646 CCS.
+   Copyright (C) 1998 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <gconv.h>
+#include <stdlib.h>
+#include <string.h>
+
+/* Direction of the transformation.  */
+enum direction
+{
+  illegal,
+  to_iso646,
+  from_iso646
+};
+
+enum variant
+{
+  US,		/* ANSI_X3.4-1968 */
+  GB,		/* BS_4730 */
+};
+
+struct iso646_data
+{
+  enum direction dir;
+  enum variant var;
+};
+
+
+int
+gconv_init (struct gconv_step *step, struct gconv_step_data *data)
+{
+  /* Determine which direction.  */
+  struct iso646_data *new_data;
+  enum direction dir;
+  enum variant var;
+  int result;
+
+  if (strcasestr (step->from_name, "ANSI_X3.4-1968") != NULL)
+    {
+      dir = from_iso646;
+      var = US;
+    }
+  else if (strcasestr (step->from_name, "BS_4730") != NULL)
+    {
+      dir = from_iso646;
+      var = GB;
+    }
+  else if (strcasestr (step->to_name, "ANSI_X3.4-1968") != NULL)
+    {
+      dir = to_iso646;
+      var = US;
+    }
+  else if (strcasestr (step->to_name, "BS_4730") != NULL)
+    {
+      dir = to_iso646;
+      var = GB;
+    }
+  else
+    dir = illegal;
+
+  result = GCONV_NOCONV;
+  if (dir != illegal
+      && ((new_data
+	   = (struct iso646_data *) malloc (sizeof (struct iso646_data)))
+	  != NULL))
+    {
+      new_data->dir = dir;
+      new_data->var = var;
+      data->data = new_data;
+      result = GCONV_OK;
+    }
+
+  return result;
+}
+
+
+void
+gconv_end (struct gconv_step_data *data)
+{
+  free (data->data);
+}
+
+
+int
+gconv (struct gconv_step *step, struct gconv_step_data *data,
+       const char *inbuf, size_t *inbufsize, size_t *written, int do_flush)
+{
+  struct gconv_step *next_step = step + 1;
+  struct gconv_step_data *next_data = data + 1;
+  gconv_fct fct = next_step->fct;
+  size_t do_write;
+  int result;
+
+  /* If the function is called with no input this means we have to reset
+     to the initial state.  The possibly partly converted input is
+     dropped.  */
+  if (do_flush)
+    {
+      do_write = 0;
+
+      /* Call the steps down the chain if there are any.  */
+      if (data->is_last)
+	result = GCONV_OK;
+      else
+	{
+	  struct gconv_step *next_step = step + 1;
+	  struct gconv_step_data *next_data = data + 1;
+
+	  result = (*fct) (next_step, next_data, NULL, 0, written, 1);
+
+	  /* Clear output buffer.  */
+	  data->outbufavail = 0;
+	}
+    }
+  else
+    {
+      enum direction dir = ((struct iso646_data *) data->data)->dir;
+      enum variant var = ((struct iso646_data *) data->data)->var;
+
+      do_write = 0;
+
+      do
+	{
+	  result = GCONV_OK;
+
+	  if (dir == from_iso646)
+	    {
+	      size_t inchars = *inbufsize;
+	      size_t outwchars = data->outbufavail;
+	      char *outbuf = data->outbuf;
+	      size_t cnt = 0;
+
+	      while (cnt < inchars
+		     && (outwchars + sizeof (wchar_t) <= data->outbufsize))
+		{
+		  switch ((unsigned char) inbuf[cnt])
+		    {
+		    case '\x23':
+		      if (var == GB)
+			*((wchar_t *) (outbuf + outwchars)) = 0xa3;
+		      else
+			*((wchar_t *) (outbuf + outwchars)) = 0x23;
+		      break;
+		    case '\x75':
+		      if (var == GB)
+			*((wchar_t *) (outbuf + outwchars)) = 0x203e;
+		      else
+			*((wchar_t *) (outbuf + outwchars)) = 0x75;
+		      break;
+		    default:
+		      *((wchar_t *) (outbuf + outwchars)) =
+			(unsigned char) inbuf[cnt];
+		    }
+		  ++do_write;
+		  outwchars += sizeof (wchar_t);
+		  ++cnt;
+		}
+	      *inbufsize -= cnt;
+	      data->outbufavail = outwchars;
+	    }
+	  else
+	    {
+	      size_t inwchars = *inbufsize;
+	      size_t outchars = data->outbufavail;
+	      char *outbuf = data->outbuf;
+	      size_t cnt = 0;
+
+	      while (inwchars >= cnt + sizeof (wchar_t)
+		     && outchars < data->outbufsize)
+		{
+		  if (*((wchar_t *) (inbuf + cnt)) >= L'\0'
+		      && *((wchar_t *) (inbuf + cnt)) <= L'\177')
+		    outbuf[outchars] = *((wchar_t *) (inbuf + cnt));
+		  else
+		    /* Here is where the transliteration would enter the
+		       scene.  */
+		    break;
+
+		  ++do_write;
+		  ++outchars;
+		  cnt += sizeof (wchar_t);
+		}
+	      *inbufsize -= cnt;
+	      data->outbufavail = outchars;
+
+	      if (outchars < data->outbufsize)
+		{
+		  /* If there is still room in the output buffer something
+		     is wrong with the input.  */
+		  if (inwchars >= cnt + sizeof (wchar_t))
+		    {
+		      /* An error occurred.  */
+		      result = GCONV_ILLEGAL_INPUT;
+		      break;
+		    }
+		  if (inwchars != cnt)
+		    {
+		      /* There are some unprocessed bytes at the end of the
+			 input buffer.  */
+		      result = GCONV_INCOMPLETE_INPUT;
+		      break;
+		    }
+		}
+	    }
+
+	  if (result != GCONV_OK)
+	    break;
+
+	  if (data->is_last)
+	    {
+	      /* This is the last step.  */
+	      result = (*inbufsize > (dir == from_iso646
+				      ? 0 : sizeof (wchar_t) - 1)
+			? GCONV_FULL_OUTPUT : GCONV_EMPTY_INPUT);
+	      break;
+	    }
+
+	  /* Status so far.  */
+	  result = GCONV_EMPTY_INPUT;
+
+	  if (data->outbufavail > 0)
+	    {
+	      /* Call the functions below in the chain.  */
+	      size_t newavail = data->outbufavail;
+
+	      result = (*fct) (next_step, next_data, data->outbuf, &newavail,
+			       written, 0);
+
+	      /* Correct the output buffer.  */
+	      if (newavail != data->outbufavail && newavail > 0)
+		{
+		  memmove (data->outbuf,
+			   &data->outbuf[data->outbufavail - newavail],
+			   newavail);
+		  data->outbufavail = newavail;
+		}
+	    }
+	}
+      while (*inbufsize > 0 && result == GCONV_EMPTY_INPUT);
+    }
+
+  if (written != NULL && data->is_last)
+    *written = do_write;
+
+  return result;
+}