1 files changed, 134 insertions, 0 deletions
diff --git a/wcsmbs/wmemrtowcs.c b/wcsmbs/wmemrtowcs.c
new file mode 100644
index 0000000000..1686229b8f
--- /dev/null
+++ b/wcsmbs/wmemrtowcs.c
@@ -0,0 +1,134 @@
+/* Copyright (C) 1997 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@gnu.org>, 1997.
+
+   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 <errno.h>
+#include <wchar.h>
+
+#ifndef EILSEQ
+#define EILSEQ EINVAL
+#endif
+
+
+/* We don't need the state really because we don't have shift states
+   to maintain between calls to this function.  */
+static mbstate_t internal;
+
+/* This is a non-standard function but it is very useful in the
+   implementation of stdio because we have to deal with unterminated
+   buffers.  At most NMC bytes will be converted.  */
+size_t
+__wmemrtowcs (dst, src, nmc, len, ps)
+     wchar_t *dst;
+     const char **src;
+     size_t nmc;
+     size_t len;
+     mbstate_t *ps;
+{
+  size_t written = 0;
+  const char *run = *src;
+  const char *last = run + nmc;
+
+  if (ps == NULL)
+    ps = &internal;
+
+  if (dst == NULL)
+    /* The LEN parameter has to be ignored if we don't actually write
+       anything.  */
+    len = ~0;
+
+  /* Copy all words.  */
+  while (written < len && run < last)
+    {
+      wchar_t value;
+      size_t count;
+      unsigned char byte = *run++;
+
+      /* We expect a start of a new multibyte character.  */
+      if (byte < 0x80)
+	{
+	  /* One byte sequence.  */
+	  count = 0;
+	  value = byte;
+	}
+      else if ((byte & 0xe0) == 0xc0)
+	{
+	  count = 1;
+	  value = byte & 0x1f;
+	}
+      else if ((byte & 0xf0) == 0xe0)
+	{
+	  /* We expect three bytes.  */
+	  count = 2;
+	  value = byte & 0x0f;
+	}
+      else if ((byte & 0xf8) == 0xf0)
+	{
+	  /* We expect four bytes.  */
+	  count = 3;
+	  value = byte & 0x07;
+	}
+      else if ((byte & 0xfc) == 0xf8)
+	{
+	  /* We expect five bytes.  */
+	  count = 4;
+	  value = byte & 0x03;
+	}
+      else if ((byte & 0xfe) == 0xfc)
+	{
+	  /* We expect six bytes.  */
+	  count = 5;
+	  value = byte & 0x01;
+	}
+      else
+	{
+	  /* This is an illegal encoding.  */
+	  __set_errno (EILSEQ);
+	  return (size_t) -1;
+	}
+
+      /* Read the possible remaining bytes.  */
+      while (count-- > 0)
+	{
+	  byte = *run++;
+
+	  if ((byte & 0xc0) != 0x80)
+	    {
+	      /* This is an illegal encoding.  */
+	      __set_errno (EILSEQ);
+	      return (size_t) -1;
+	    }
+
+	  value <<= 6;
+	  value |= byte & 0x3f;
+	}
+
+      /* Store value is required.  */
+      if (dst != NULL)
+	*dst++ = value;
+
+      /* Increment counter of produced words.  */
+      ++written;
+    }
+
+  /* Store address of next byte to process.  */
+  *src = run;
+
+  return written;
+}
+weak_alias (__wmemrtowcs, wmemrtowcs)