Add uchar.h support, part 1

c16 support for locales other than the C locale is still missing.

1 files changed, 121 insertions, 0 deletions

diff --git a/wcsmbs/c16rtomb.c b/wcsmbs/c16rtomb.c
new file mode 100644
index 0000000000..33e6b92d02
--- /dev/null
+++ b/wcsmbs/c16rtomb.c
@@ -0,0 +1,121 @@
+/* Copyright (C) 2011 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 2011.
+
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <assert.h>
+#include <dlfcn.h>
+#include <errno.h>
+#include <gconv.h>
+#include <stdlib.h>
+#include <uchar.h>
+#include <wcsmbsload.h>
+
+#include <sysdep.h>
+
+#ifndef EILSEQ
+# define EILSEQ EINVAL
+#endif
+
+#if __STDC__ >= 20100L
+# define u(c) U##c
+#else
+# define u(c) L##c
+#endif
+
+
+/* This is the private state used if PS is NULL.  */
+static mbstate_t state;
+
+size_t
+c16rtomb (char *s, char16_t c16, mbstate_t *ps)
+{
+  char buf[MB_CUR_MAX];
+  struct __gconv_step_data data;
+  int status;
+  size_t result;
+  size_t dummy;
+  const struct gconv_fcts *fcts;
+
+  /* Set information for this step.  */
+  data.__invocation_counter = 0;
+  data.__internal_use = 1;
+  data.__flags = __GCONV_IS_LAST;
+  data.__statep = ps ?: &state;
+  data.__trans = NULL;
+
+  /* A first special case is if S is NULL.  This means put PS in the
+     initial state.  */
+  if (s == NULL)
+    {
+      s = buf;
+      c16 = u('\0');
+    }
+
+  /* Tell where we want to have the result.  */
+  data.__outbuf = (unsigned char *) s;
+  data.__outbufend = (unsigned char *) s + MB_CUR_MAX;
+
+  /* Get the conversion functions.  */
+  fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
+  __gconv_fct fct = fcts->fromc16->__fct;
+#ifdef PTR_DEMANGLE
+  if (fcts->tomb->__shlib_handle != NULL)
+    PTR_DEMANGLE (fct);
+#endif
+
+  /* If C16 is the NUL character we write into the output buffer the byte
+     sequence necessary for PS to get into the initial state, followed
+     by a NUL byte.  */
+  if (c16 == L'\0')
+    {
+      status = DL_CALL_FCT (fct, (fcts->fromc16, &data, NULL, NULL,
+				  NULL, &dummy, 1, 1));
+
+      if (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
+	*data.__outbuf++ = '\0';
+    }
+  else
+    {
+      /* Do a normal conversion.  */
+      const unsigned char *inbuf = (const unsigned char *) &c16;
+
+      status = DL_CALL_FCT (fct,
+			    (fcts->fromc16, &data, &inbuf,
+			     inbuf + sizeof (char16_t), NULL, &dummy, 0, 1));
+    }
+
+  /* There must not be any problems with the conversion but illegal input
+     characters.  The output buffer must be large enough, otherwise the
+     definition of MB_CUR_MAX is not correct.  All the other possible
+     errors also must not happen.  */
+  assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
+	  || status == __GCONV_ILLEGAL_INPUT
+	  || status == __GCONV_INCOMPLETE_INPUT
+	  || status == __GCONV_FULL_OUTPUT);
+
+  if (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
+      || status == __GCONV_FULL_OUTPUT)
+    result = data.__outbuf - (unsigned char *) s;
+  else
+    {
+      result = (size_t) -1;
+      __set_errno (EILSEQ);
+    }
+
+  return result;
+}