Import glibc-mainline for 2006-08-16

git-svn-id: svn://svn.eglibc.org/fsf/trunk@4 7b3dc134-2b1b-0410-93df-9e9f96275f8d

1 files changed, 103 insertions, 0 deletions

diff --git a/libc/wcsmbs/btowc.c b/libc/wcsmbs/btowc.c
new file mode 100644
index 000000000..6517d4f63
--- /dev/null
+++ b/libc/wcsmbs/btowc.c
@@ -0,0 +1,103 @@
+/* Copyright (C) 1996-2000,2002,2005 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@gnu.org>, 1996.
+
+   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 <ctype.h>
+#include <dlfcn.h>
+#include <gconv.h>
+#include <stdio.h>
+#include <string.h>
+#include <wchar.h>
+#include <wcsmbsload.h>
+#include <limits.h>
+
+#include <sysdep.h>
+
+
+wint_t
+__btowc (c)
+     int c;
+{
+  const struct gconv_fcts *fcts;
+
+  /* If the parameter does not fit into one byte or it is the EOF value
+     we can give the answer now.  */
+  if (c < SCHAR_MIN || c > UCHAR_MAX || c == EOF)
+    return WEOF;
+
+  /* We know that only ASCII compatible encodings are used for the
+     locale and that the wide character encoding is ISO 10646.  */
+  if (isascii (c))
+    return (wint_t) c;
+
+  /* Get the conversion functions.  */
+  fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
+  __gconv_btowc_fct btowc_fct = fcts->towc->__btowc_fct;
+
+  if (__builtin_expect (fcts->towc_nsteps == 1, 1)
+      && __builtin_expect (btowc_fct != NULL, 1))
+    {
+      /* Use the shortcut function.  */
+#ifdef PTR_DEMANGLE
+      if (fcts->towc->__shlib_handle != NULL)
+	PTR_DEMANGLE (btowc_fct);
+#endif
+      return DL_CALL_FCT (btowc_fct, (fcts->towc, (unsigned char) c));
+    }
+  else
+    {
+      /* Fall back to the slow but generic method.  */
+      wchar_t result;
+      struct __gconv_step_data data;
+      unsigned char inbuf[1];
+      const unsigned char *inptr = inbuf;
+      size_t dummy;
+      int status;
+
+      /* Tell where we want the result.  */
+      data.__outbuf = (unsigned char *) &result;
+      data.__outbufend = data.__outbuf + sizeof (wchar_t);
+      data.__invocation_counter = 0;
+      data.__internal_use = 1;
+      data.__flags = __GCONV_IS_LAST;
+      data.__statep = &data.__state;
+      data.__trans = NULL;
+
+      /* Make sure we start in the initial state.  */
+      memset (&data.__state, '\0', sizeof (mbstate_t));
+
+      /* Create the input string.  */
+      inbuf[0] = c;
+
+      __gconv_fct fct = fcts->towc->__fct;
+#ifdef PTR_DEMANGLE
+      if (fcts->towc->__shlib_handle != NULL)
+	PTR_DEMANGLE (fct);
+#endif
+      status = DL_CALL_FCT (fct, (fcts->towc, &data, &inptr, inptr + 1,
+				  NULL, &dummy, 0, 1));
+
+      if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT
+	  && status != __GCONV_EMPTY_INPUT)
+	/* The conversion failed.  */
+	result = WEOF;
+
+      return result;
+    }
+}
+weak_alias (__btowc, btowc)