Gcc 3.4.2 20040728.

1 files changed, 1411 insertions, 0 deletions

diff --git a/contrib/gcc/cppcharset.c b/contrib/gcc/cppcharset.c
new file mode 100644
index 0000000..a6a65ed
--- /dev/null
+++ b/contrib/gcc/cppcharset.c
@@ -0,0 +1,1411 @@
+/* CPP Library - charsets
+   Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004
+   Free Software Foundation, Inc.
+
+   Broken out of c-lex.c Apr 2003, adding valid C99 UCN ranges.
+
+This program is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2, or (at your option) any
+later version.
+
+This program 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#include "config.h"
+#include "system.h"
+#include "cpplib.h"
+#include "cpphash.h"
+#include "cppucnid.h"
+
+/* Character set handling for C-family languages.
+
+   Terminological note: In what follows, "charset" or "character set"
+   will be taken to mean both an abstract set of characters and an
+   encoding for that set.
+
+   The C99 standard discusses two character sets: source and execution.
+   The source character set is used for internal processing in translation
+   phases 1 through 4; the execution character set is used thereafter.
+   Both are required by 5.2.1.2p1 to be multibyte encodings, not wide
+   character encodings (see 3.7.2, 3.7.3 for the standardese meanings
+   of these terms).  Furthermore, the "basic character set" (listed in
+   5.2.1p3) is to be encoded in each with values one byte wide, and is
+   to appear in the initial shift state.
+
+   It is not explicitly mentioned, but there is also a "wide execution
+   character set" used to encode wide character constants and wide
+   string literals; this is supposed to be the result of applying the
+   standard library function mbstowcs() to an equivalent narrow string
+   (6.4.5p5).  However, the behavior of hexadecimal and octal
+   \-escapes is at odds with this; they are supposed to be translated
+   directly to wchar_t values (6.4.4.4p5,6).
+
+   The source character set is not necessarily the character set used
+   to encode physical source files on disk; translation phase 1 converts
+   from whatever that encoding is to the source character set.
+
+   The presence of universal character names in C99 (6.4.3 et seq.)
+   forces the source character set to be isomorphic to ISO 10646,
+   that is, Unicode.  There is no such constraint on the execution
+   character set; note also that the conversion from source to
+   execution character set does not occur for identifiers (5.1.1.2p1#5).
+
+   For convenience of implementation, the source character set's
+   encoding of the basic character set should be identical to the
+   execution character set OF THE HOST SYSTEM's encoding of the basic
+   character set, and it should not be a state-dependent encoding.
+
+   cpplib uses UTF-8 or UTF-EBCDIC for the source character set,
+   depending on whether the host is based on ASCII or EBCDIC (see
+   respectively Unicode section 2.3/ISO10646 Amendment 2, and Unicode
+   Technical Report #16).  With limited exceptions, it relies on the
+   system library's iconv() primitive to do charset conversion
+   (specified in SUSv2).  */
+
+#if !HAVE_ICONV
+/* Make certain that the uses of iconv(), iconv_open(), iconv_close()
+   below, which are guarded only by if statements with compile-time
+   constant conditions, do not cause link errors.  */
+#define iconv_open(x, y) (errno = EINVAL, (iconv_t)-1)
+#define iconv(a,b,c,d,e) (errno = EINVAL, (size_t)-1)
+#define iconv_close(x)   (void)0
+#define ICONV_CONST
+#endif
+
+#if HOST_CHARSET == HOST_CHARSET_ASCII
+#define SOURCE_CHARSET "UTF-8"
+#elif HOST_CHARSET == HOST_CHARSET_EBCDIC
+#define SOURCE_CHARSET "UTF-EBCDIC"
+#else
+#error "Unrecognized basic host character set"
+#endif
+
+#ifndef EILSEQ
+#define EILSEQ EINVAL
+#endif
+
+/* This structure is used for a resizable string buffer throughout.  */
+/* Don't call it strbuf, as that conflicts with unistd.h on systems
+   such as DYNIX/ptx where unistd.h includes stropts.h.  */
+struct _cpp_strbuf
+{
+  uchar *text;
+  size_t asize;
+  size_t len;
+};
+
+/* This is enough to hold any string that fits on a single 80-column
+   line, even if iconv quadruples its size (e.g. conversion from
+   ASCII to UTF-32) rounded up to a power of two.  */
+#define OUTBUF_BLOCK_SIZE 256
+
+/* Conversions between UTF-8 and UTF-16/32 are implemented by custom
+   logic.  This is because a depressing number of systems lack iconv,
+   or have have iconv libraries that do not do these conversions, so
+   we need a fallback implementation for them.  To ensure the fallback
+   doesn't break due to neglect, it is used on all systems.
+
+   UTF-32 encoding is nice and simple: a four-byte binary number,
+   constrained to the range 00000000-7FFFFFFF to avoid questions of
+   signedness.  We do have to cope with big- and little-endian
+   variants.
+
+   UTF-16 encoding uses two-byte binary numbers, again in big- and
+   little-endian variants, for all values in the 00000000-0000FFFF
+   range.  Values in the 00010000-0010FFFF range are encoded as pairs
+   of two-byte numbers, called "surrogate pairs": given a number S in
+   this range, it is mapped to a pair (H, L) as follows:
+
+     H = (S - 0x10000) / 0x400 + 0xD800
+     L = (S - 0x10000) % 0x400 + 0xDC00
+
+   Two-byte values in the D800...DFFF range are ill-formed except as a
+   component of a surrogate pair.  Even if the encoding within a
+   two-byte value is little-endian, the H member of the surrogate pair
+   comes first.
+
+   There is no way to encode values in the 00110000-7FFFFFFF range,
+   which is not currently a problem as there are no assigned code
+   points in that range; however, the author expects that it will
+   eventually become necessary to abandon UTF-16 due to this
+   limitation.  Note also that, because of these pairs, UTF-16 does
+   not meet the requirements of the C standard for a wide character
+   encoding (see 3.7.3 and 6.4.4.4p11).
+
+   UTF-8 encoding looks like this:
+
+   value range	       encoded as
+   00000000-0000007F   0xxxxxxx
+   00000080-000007FF   110xxxxx 10xxxxxx
+   00000800-0000FFFF   1110xxxx 10xxxxxx 10xxxxxx
+   00010000-001FFFFF   11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
+   00200000-03FFFFFF   111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
+   04000000-7FFFFFFF   1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
+
+   Values in the 0000D800 ... 0000DFFF range (surrogates) are invalid,
+   which means that three-byte sequences ED xx yy, with A0 <= xx <= BF,
+   never occur.  Note also that any value that can be encoded by a
+   given row of the table can also be encoded by all successive rows,
+   but this is not done; only the shortest possible encoding for any
+   given value is valid.  For instance, the character 07C0 could be
+   encoded as any of DF 80, E0 9F 80, F0 80 9F 80, F8 80 80 9F 80, or
+   FC 80 80 80 9F 80.  Only the first is valid.
+
+   An implementation note: the transformation from UTF-16 to UTF-8, or
+   vice versa, is easiest done by using UTF-32 as an intermediary.  */
+
+/* Internal primitives which go from an UTF-8 byte stream to native-endian
+   UTF-32 in a cppchar_t, or vice versa; this avoids an extra marshal/unmarshal
+   operation in several places below.  */
+static inline int
+one_utf8_to_cppchar (const uchar **inbufp, size_t *inbytesleftp,
+		     cppchar_t *cp)
+{
+  static const uchar masks[6] = { 0x7F, 0x1F, 0x0F, 0x07, 0x02, 0x01 };
+  static const uchar patns[6] = { 0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC };
+
+  cppchar_t c;
+  const uchar *inbuf = *inbufp;
+  size_t nbytes, i;
+
+  if (*inbytesleftp < 1)
+    return EINVAL;
+
+  c = *inbuf;
+  if (c < 0x80)
+    {
+      *cp = c;
+      *inbytesleftp -= 1;
+      *inbufp += 1;
+      return 0;
+    }
+
+  /* The number of leading 1-bits in the first byte indicates how many
+     bytes follow.  */
+  for (nbytes = 2; nbytes < 7; nbytes++)
+    if ((c & ~masks[nbytes-1]) == patns[nbytes-1])
+      goto found;
+  return EILSEQ;
+ found:
+
+  if (*inbytesleftp < nbytes)
+    return EINVAL;
+
+  c = (c & masks[nbytes-1]);
+  inbuf++;
+  for (i = 1; i < nbytes; i++)
+    {
+      cppchar_t n = *inbuf++;
+      if ((n & 0xC0) != 0x80)
+	return EILSEQ;
+      c = ((c << 6) + (n & 0x3F));
+    }
+
+  /* Make sure the shortest possible encoding was used.  */
+  if (c <=      0x7F && nbytes > 1) return EILSEQ;
+  if (c <=     0x7FF && nbytes > 2) return EILSEQ;
+  if (c <=    0xFFFF && nbytes > 3) return EILSEQ;
+  if (c <=  0x1FFFFF && nbytes > 4) return EILSEQ;
+  if (c <= 0x3FFFFFF && nbytes > 5) return EILSEQ;
+
+  /* Make sure the character is valid.  */
+  if (c > 0x7FFFFFFF || (c >= 0xD800 && c <= 0xDFFF)) return EILSEQ;
+
+  *cp = c;
+  *inbufp = inbuf;
+  *inbytesleftp -= nbytes;
+  return 0;
+}
+
+static inline int
+one_cppchar_to_utf8 (cppchar_t c, uchar **outbufp, size_t *outbytesleftp)
+{
+  static const uchar masks[6] =  { 0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC };
+  static const uchar limits[6] = { 0x80, 0xE0, 0xF0, 0xF8, 0xFC, 0xFE };
+  size_t nbytes;
+  uchar buf[6], *p = &buf[6];
+  uchar *outbuf = *outbufp;
+
+  nbytes = 1;
+  if (c < 0x80)
+    *--p = c;
+  else
+    {
+      do
+	{
+	  *--p = ((c & 0x3F) | 0x80);
+	  c >>= 6;
+	  nbytes++;
+	}
+      while (c >= 0x3F || (c & limits[nbytes-1]));
+      *--p = (c | masks[nbytes-1]);
+    }
+
+  if (*outbytesleftp < nbytes)
+    return E2BIG;
+
+  while (p < &buf[6])
+    *outbuf++ = *p++;
+  *outbytesleftp -= nbytes;
+  *outbufp = outbuf;
+  return 0;
+}
+
+/* The following four functions transform one character between the two
+   encodings named in the function name.  All have the signature
+   int (*)(iconv_t bigend, const uchar **inbufp, size_t *inbytesleftp,
+           uchar **outbufp, size_t *outbytesleftp)
+
+   BIGEND must have the value 0 or 1, coerced to (iconv_t); it is
+   interpreted as a boolean indicating whether big-endian or
+   little-endian encoding is to be used for the member of the pair
+   that is not UTF-8.
+
+   INBUFP, INBYTESLEFTP, OUTBUFP, OUTBYTESLEFTP work exactly as they
+   do for iconv.
+
+   The return value is either 0 for success, or an errno value for
+   failure, which may be E2BIG (need more space), EILSEQ (ill-formed
+   input sequence), ir EINVAL (incomplete input sequence).  */
+
+static inline int
+one_utf8_to_utf32 (iconv_t bigend, const uchar **inbufp, size_t *inbytesleftp,
+		   uchar **outbufp, size_t *outbytesleftp)
+{
+  uchar *outbuf;
+  cppchar_t s = 0;
+  int rval;
+
+  /* Check for space first, since we know exactly how much we need.  */
+  if (*outbytesleftp < 4)
+    return E2BIG;
+
+  rval = one_utf8_to_cppchar (inbufp, inbytesleftp, &s);
+  if (rval)
+    return rval;
+
+  outbuf = *outbufp;
+  outbuf[bigend ? 3 : 0] = (s & 0x000000FF);
+  outbuf[bigend ? 2 : 1] = (s & 0x0000FF00) >> 8;
+  outbuf[bigend ? 1 : 2] = (s & 0x00FF0000) >> 16;
+  outbuf[bigend ? 0 : 3] = (s & 0xFF000000) >> 24;
+
+  *outbufp += 4;
+  *outbytesleftp -= 4;
+  return 0;
+}
+
+static inline int
+one_utf32_to_utf8 (iconv_t bigend, const uchar **inbufp, size_t *inbytesleftp,
+		   uchar **outbufp, size_t *outbytesleftp)
+{
+  cppchar_t s;
+  int rval;
+  const uchar *inbuf;
+
+  if (*inbytesleftp < 4)
+    return EINVAL;
+
+  inbuf = *inbufp;
+
+  s  = inbuf[bigend ? 0 : 3] << 24;
+  s += inbuf[bigend ? 1 : 2] << 16;
+  s += inbuf[bigend ? 2 : 1] << 8;
+  s += inbuf[bigend ? 3 : 0];
+
+  if (s >= 0x7FFFFFFF || (s >= 0xD800 && s <= 0xDFFF))
+    return EILSEQ;
+
+  rval = one_cppchar_to_utf8 (s, outbufp, outbytesleftp);
+  if (rval)
+    return rval;
+
+  *inbufp += 4;
+  *inbytesleftp -= 4;
+  return 0;
+}
+
+static inline int
+one_utf8_to_utf16 (iconv_t bigend, const uchar **inbufp, size_t *inbytesleftp,
+		   uchar **outbufp, size_t *outbytesleftp)
+{
+  int rval;
+  cppchar_t s = 0;
+  const uchar *save_inbuf = *inbufp;
+  size_t save_inbytesleft = *inbytesleftp;
+  uchar *outbuf = *outbufp;
+
+  rval = one_utf8_to_cppchar (inbufp, inbytesleftp, &s);
+  if (rval)
+    return rval;
+
+  if (s > 0x0010FFFF)
+    {
+      *inbufp = save_inbuf;
+      *inbytesleftp = save_inbytesleft;
+      return EILSEQ;
+    }
+
+  if (s < 0xFFFF)
+    {
+      if (*outbytesleftp < 2)
+	{
+	  *inbufp = save_inbuf;
+	  *inbytesleftp = save_inbytesleft;
+	  return E2BIG;
+	}
+      outbuf[bigend ? 1 : 0] = (s & 0x00FF);
+      outbuf[bigend ? 0 : 1] = (s & 0xFF00) >> 8;
+
+      *outbufp += 2;
+      *outbytesleftp -= 2;
+      return 0;
+    }
+  else
+    {
+      cppchar_t hi, lo;
+
+      if (*outbytesleftp < 4)
+	{
+	  *inbufp = save_inbuf;
+	  *inbytesleftp = save_inbytesleft;
+	  return E2BIG;
+	}
+
+      hi = (s - 0x10000) / 0x400 + 0xD800;
+      lo = (s - 0x10000) % 0x400 + 0xDC00;
+
+      /* Even if we are little-endian, put the high surrogate first.
+	 ??? Matches practice?  */
+      outbuf[bigend ? 1 : 0] = (hi & 0x00FF);
+      outbuf[bigend ? 0 : 1] = (hi & 0xFF00) >> 8;
+      outbuf[bigend ? 3 : 2] = (lo & 0x00FF);
+      outbuf[bigend ? 2 : 3] = (lo & 0xFF00) >> 8;
+
+      *outbufp += 4;
+      *outbytesleftp -= 4;
+      return 0;
+    }
+}
+
+static inline int
+one_utf16_to_utf8 (iconv_t bigend, const uchar **inbufp, size_t *inbytesleftp,
+		   uchar **outbufp, size_t *outbytesleftp)
+{
+  cppchar_t s;
+  const uchar *inbuf = *inbufp;
+  int rval;
+
+  if (*inbytesleftp < 2)
+    return EINVAL;
+  s  = inbuf[bigend ? 0 : 1] << 8;
+  s += inbuf[bigend ? 1 : 0];
+
+  /* Low surrogate without immediately preceding high surrogate is invalid.  */
+  if (s >= 0xDC00 && s <= 0xDFFF)
+    return EILSEQ;
+  /* High surrogate must have a following low surrogate.  */
+  else if (s >= 0xD800 && s <= 0xDBFF)
+    {
+      cppchar_t hi = s, lo;
+      if (*inbytesleftp < 4)
+	return EINVAL;
+
+      lo  = inbuf[bigend ? 2 : 3] << 8;
+      lo += inbuf[bigend ? 3 : 2];
+
+      if (lo < 0xDC00 || lo > 0xDFFF)
+	return EILSEQ;
+
+      s = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;
+    }
+
+  rval = one_cppchar_to_utf8 (s, outbufp, outbytesleftp);
+  if (rval)
+    return rval;
+
+  /* Success - update the input pointers (one_cppchar_to_utf8 has done
+     the output pointers for us).  */
+  if (s <= 0xFFFF)
+    {
+      *inbufp += 2;
+      *inbytesleftp -= 2;
+    }
+  else
+    {
+      *inbufp += 4;
+      *inbytesleftp -= 4;
+    }
+  return 0;
+}
+
+/* Helper routine for the next few functions.  The 'const' on
+   one_conversion means that we promise not to modify what function is
+   pointed to, which lets the inliner see through it.  */
+
+static inline bool
+conversion_loop (int (*const one_conversion)(iconv_t, const uchar **, size_t *,
+					     uchar **, size_t *),
+		 iconv_t cd, const uchar *from, size_t flen, struct _cpp_strbuf *to)
+{
+  const uchar *inbuf;
+  uchar *outbuf;
+  size_t inbytesleft, outbytesleft;
+  int rval;
+
+  inbuf = from;
+  inbytesleft = flen;
+  outbuf = to->text + to->len;
+  outbytesleft = to->asize - to->len;
+
+  for (;;)
+    {
+      do
+	rval = one_conversion (cd, &inbuf, &inbytesleft,
+			       &outbuf, &outbytesleft);
+      while (inbytesleft && !rval);
+
+      if (__builtin_expect (inbytesleft == 0, 1))
+	{
+	  to->len = to->asize - outbytesleft;
+	  return true;
+	}
+      if (rval != E2BIG)
+	{
+	  errno = rval;
+	  return false;
+	}
+
+      outbytesleft += OUTBUF_BLOCK_SIZE;
+      to->asize += OUTBUF_BLOCK_SIZE;
+      to->text = xrealloc (to->text, to->asize);
+      outbuf = to->text + to->asize - outbytesleft;
+    }
+}
+
+
+/* These functions convert entire strings between character sets.
+   They all have the signature
+
+   bool (*)(iconv_t cd, const uchar *from, size_t flen, struct _cpp_strbuf *to);
+
+   The input string FROM is converted as specified by the function
+   name plus the iconv descriptor CD (which may be fake), and the
+   result appended to TO.  On any error, false is returned, otherwise true.  */
+
+/* These four use the custom conversion code above.  */
+static bool
+convert_utf8_utf16 (iconv_t cd, const uchar *from, size_t flen,
+		    struct _cpp_strbuf *to)
+{
+  return conversion_loop (one_utf8_to_utf16, cd, from, flen, to);
+}
+
+static bool
+convert_utf8_utf32 (iconv_t cd, const uchar *from, size_t flen,
+		    struct _cpp_strbuf *to)
+{
+  return conversion_loop (one_utf8_to_utf32, cd, from, flen, to);
+}
+
+static bool
+convert_utf16_utf8 (iconv_t cd, const uchar *from, size_t flen,
+		    struct _cpp_strbuf *to)
+{
+  return conversion_loop (one_utf16_to_utf8, cd, from, flen, to);
+}
+
+static bool
+convert_utf32_utf8 (iconv_t cd, const uchar *from, size_t flen,
+		    struct _cpp_strbuf *to)
+{
+  return conversion_loop (one_utf32_to_utf8, cd, from, flen, to);
+}
+
+/* Identity conversion, used when we have no alternative.  */
+static bool
+convert_no_conversion (iconv_t cd ATTRIBUTE_UNUSED,
+		       const uchar *from, size_t flen, struct _cpp_strbuf *to)
+{
+  if (to->len + flen > to->asize)
+    {
+      to->asize = to->len + flen;
+      to->text = xrealloc (to->text, to->asize);
+    }
+  memcpy (to->text + to->len, from, flen);
+  to->len += flen;
+  return true;
+}
+
+/* And this one uses the system iconv primitive.  It's a little
+   different, since iconv's interface is a little different.  */
+#if HAVE_ICONV
+static bool
+convert_using_iconv (iconv_t cd, const uchar *from, size_t flen,
+		     struct _cpp_strbuf *to)
+{
+  ICONV_CONST char *inbuf;
+  char *outbuf;
+  size_t inbytesleft, outbytesleft;
+
+  /* Reset conversion descriptor and check that it is valid.  */
+  if (iconv (cd, 0, 0, 0, 0) == (size_t)-1)
+    return false;
+
+  inbuf = (ICONV_CONST char *)from;
+  inbytesleft = flen;
+  outbuf = (char *)to->text + to->len;
+  outbytesleft = to->asize - to->len;
+
+  for (;;)
+    {
+      iconv (cd, &inbuf, &inbytesleft, &outbuf, &outbytesleft);
+      if (__builtin_expect (inbytesleft == 0, 1))
+	{
+	  to->len = to->asize - outbytesleft;
+	  return true;
+	}
+      if (errno != E2BIG)
+	return false;
+
+      outbytesleft += OUTBUF_BLOCK_SIZE;
+      to->asize += OUTBUF_BLOCK_SIZE;
+      to->text = xrealloc (to->text, to->asize);
+      outbuf = (char *)to->text + to->asize - outbytesleft;
+    }
+}
+#else
+#define convert_using_iconv 0 /* prevent undefined symbol error below */
+#endif
+
+/* Arrange for the above custom conversion logic to be used automatically
+   when conversion between a suitable pair of character sets is requested.  */
+
+#define APPLY_CONVERSION(CONVERTER, FROM, FLEN, TO) \
+   CONVERTER.func (CONVERTER.cd, FROM, FLEN, TO)
+
+struct conversion
+{
+  const char *pair;
+  convert_f func;
+  iconv_t fake_cd;
+};
+static const struct conversion conversion_tab[] = {
+  { "UTF-8/UTF-32LE", convert_utf8_utf32, (iconv_t)0 },
+  { "UTF-8/UTF-32BE", convert_utf8_utf32, (iconv_t)1 },
+  { "UTF-8/UTF-16LE", convert_utf8_utf16, (iconv_t)0 },
+  { "UTF-8/UTF-16BE", convert_utf8_utf16, (iconv_t)1 },
+  { "UTF-32LE/UTF-8", convert_utf32_utf8, (iconv_t)0 },
+  { "UTF-32BE/UTF-8", convert_utf32_utf8, (iconv_t)1 },
+  { "UTF-16LE/UTF-8", convert_utf16_utf8, (iconv_t)0 },
+  { "UTF-16BE/UTF-8", convert_utf16_utf8, (iconv_t)1 },
+};
+
+/* Subroutine of cpp_init_iconv: initialize and return a
+   cset_converter structure for conversion from FROM to TO.  If
+   iconv_open() fails, issue an error and return an identity
+   converter.  Silently return an identity converter if FROM and TO
+   are identical.  */
+static struct cset_converter
+init_iconv_desc (cpp_reader *pfile, const char *to, const char *from)
+{
+  struct cset_converter ret;
+  char *pair;
+  size_t i;
+
+  if (!strcasecmp (to, from))
+    {
+      ret.func = convert_no_conversion;
+      ret.cd = (iconv_t) -1;
+      return ret;
+    }
+
+  pair = alloca(strlen(to) + strlen(from) + 2);
+
+  strcpy(pair, from);
+  strcat(pair, "/");
+  strcat(pair, to);
+  for (i = 0; i < ARRAY_SIZE (conversion_tab); i++)
+    if (!strcasecmp (pair, conversion_tab[i].pair))
+      {
+	ret.func = conversion_tab[i].func;
+	ret.cd = conversion_tab[i].fake_cd;
+	return ret;
+      }
+
+  /* No custom converter - try iconv.  */
+  if (HAVE_ICONV)
+    {
+      ret.func = convert_using_iconv;
+      ret.cd = iconv_open (to, from);
+
+      if (ret.cd == (iconv_t) -1)
+	{
+	  if (errno == EINVAL)
+	    cpp_error (pfile, CPP_DL_ERROR, /* XXX should be DL_SORRY */
+		       "conversion from %s to %s not supported by iconv",
+		       from, to);
+	  else
+	    cpp_errno (pfile, CPP_DL_ERROR, "iconv_open");
+
+	  ret.func = convert_no_conversion;
+	}
+    }
+  else
+    {
+      cpp_error (pfile, CPP_DL_ERROR, /* XXX should be DL_SORRY */
+		 "no iconv implementation, cannot convert from %s to %s",
+		 from, to);
+      ret.func = convert_no_conversion;
+      ret.cd = (iconv_t) -1;
+    }
+  return ret;
+}
+
+/* If charset conversion is requested, initialize iconv(3) descriptors
+   for conversion from the source character set to the execution
+   character sets.  If iconv is not present in the C library, and
+   conversion is requested, issue an error.  */
+
+void
+cpp_init_iconv (cpp_reader *pfile)
+{
+  const char *ncset = CPP_OPTION (pfile, narrow_charset);
+  const char *wcset = CPP_OPTION (pfile, wide_charset);
+  const char *default_wcset;
+
+  bool be = CPP_OPTION (pfile, bytes_big_endian);
+
+  if (CPP_OPTION (pfile, wchar_precision) >= 32)
+    default_wcset = be ? "UTF-32BE" : "UTF-32LE";
+  else if (CPP_OPTION (pfile, wchar_precision) >= 16)
+    default_wcset = be ? "UTF-16BE" : "UTF-16LE";
+  else
+    /* This effectively means that wide strings are not supported,
+       so don't do any conversion at all.  */
+   default_wcset = SOURCE_CHARSET;
+
+  if (!ncset)
+    ncset = SOURCE_CHARSET;
+  if (!wcset)
+    wcset = default_wcset;
+
+  pfile->narrow_cset_desc = init_iconv_desc (pfile, ncset, SOURCE_CHARSET);
+  pfile->wide_cset_desc = init_iconv_desc (pfile, wcset, SOURCE_CHARSET);
+}
+
+void
+_cpp_destroy_iconv (cpp_reader *pfile)
+{
+  if (HAVE_ICONV)
+    {
+      if (pfile->narrow_cset_desc.func == convert_using_iconv)
+	iconv_close (pfile->narrow_cset_desc.cd);
+      if (pfile->wide_cset_desc.func == convert_using_iconv)
+	iconv_close (pfile->wide_cset_desc.cd);
+    }
+}
+
+
+/* Utility routine that computes a mask of the form 0000...111... with
+   WIDTH 1-bits.  */
+static inline size_t
+width_to_mask (size_t width)
+{
+  width = MIN (width, BITS_PER_CPPCHAR_T);
+  if (width >= CHAR_BIT * sizeof (size_t))
+    return ~(size_t) 0;
+  else
+    return ((size_t) 1 << width) - 1;
+}
+
+
+
+/* Returns 1 if C is valid in an identifier, 2 if C is valid except at
+   the start of an identifier, and 0 if C is not valid in an
+   identifier.  We assume C has already gone through the checks of
+   _cpp_valid_ucn.  The algorithm is a simple binary search on the
+   table defined in cppucnid.h.  */
+
+static int
+ucn_valid_in_identifier (cpp_reader *pfile, cppchar_t c)
+{
+  int mn, mx, md;
+
+  mn = -1;
+  mx = ARRAY_SIZE (ucnranges);
+  while (mx - mn > 1)
+    {
+      md = (mn + mx) / 2;
+      if (c < ucnranges[md].lo)
+	mx = md;
+      else if (c > ucnranges[md].hi)
+	mn = md;
+      else
+	goto found;
+    }
+  return 0;
+
+ found:
+  /* When -pedantic, we require the character to have been listed by
+     the standard for the current language.  Otherwise, we accept the
+     union of the acceptable sets for C++98 and C99.  */
+  if (CPP_PEDANTIC (pfile)
+      && ((CPP_OPTION (pfile, c99) && !(ucnranges[md].flags & C99))
+	  || (CPP_OPTION (pfile, cplusplus)
+	      && !(ucnranges[md].flags & CXX))))
+    return 0;
+
+  /* In C99, UCN digits may not begin identifiers.  */
+  if (CPP_OPTION (pfile, c99) && (ucnranges[md].flags & DIG))
+    return 2;
+
+  return 1;
+}
+
+/* [lex.charset]: The character designated by the universal character
+   name \UNNNNNNNN is that character whose character short name in
+   ISO/IEC 10646 is NNNNNNNN; the character designated by the
+   universal character name \uNNNN is that character whose character
+   short name in ISO/IEC 10646 is 0000NNNN.  If the hexadecimal value
+   for a universal character name is less than 0x20 or in the range
+   0x7F-0x9F (inclusive), or if the universal character name
+   designates a character in the basic source character set, then the
+   program is ill-formed.
+
+   *PSTR must be preceded by "\u" or "\U"; it is assumed that the
+   buffer end is delimited by a non-hex digit.  Returns zero if UCNs
+   are not part of the relevant standard, or if the string beginning
+   at *PSTR doesn't syntactically match the form 'NNNN' or 'NNNNNNNN'.
+
+   Otherwise the nonzero value of the UCN, whether valid or invalid,
+   is returned.  Diagnostics are emitted for invalid values.  PSTR
+   is updated to point one beyond the UCN, or to the syntactically
+   invalid character.
+
+   IDENTIFIER_POS is 0 when not in an identifier, 1 for the start of
+   an identifier, or 2 otherwise.
+*/
+
+cppchar_t
+_cpp_valid_ucn (cpp_reader *pfile, const uchar **pstr,
+		const uchar *limit, int identifier_pos)
+{
+  cppchar_t result, c;
+  unsigned int length;
+  const uchar *str = *pstr;
+  const uchar *base = str - 2;
+
+  if (!CPP_OPTION (pfile, cplusplus) && !CPP_OPTION (pfile, c99))
+    cpp_error (pfile, CPP_DL_WARNING,
+	       "universal character names are only valid in C++ and C99");
+  else if (CPP_WTRADITIONAL (pfile) && identifier_pos == 0)
+    cpp_error (pfile, CPP_DL_WARNING,
+	       "the meaning of '\\%c' is different in traditional C",
+	       (int) str[-1]);
+
+  if (str[-1] == 'u')
+    length = 4;
+  else if (str[-1] == 'U')
+    length = 8;
+  else
+    abort();
+
+  result = 0;
+  do
+    {
+      c = *str;
+      if (!ISXDIGIT (c))
+	break;
+      str++;
+      result = (result << 4) + hex_value (c);
+    }
+  while (--length && str < limit);
+
+  *pstr = str;
+  if (length)
+    {
+      /* We'll error when we try it out as the start of an identifier.  */
+      cpp_error (pfile, CPP_DL_ERROR,
+		 "incomplete universal character name %.*s",
+		 (int) (str - base), base);
+      result = 1;
+    }
+  /* The standard permits $, @ and ` to be specified as UCNs.  We use
+     hex escapes so that this also works with EBCDIC hosts.  */
+  else if ((result < 0xa0
+	    && (result != 0x24 && result != 0x40 && result != 0x60))
+	   || (result & 0x80000000)
+	   || (result >= 0xD800 && result <= 0xDFFF))
+    {
+      cpp_error (pfile, CPP_DL_ERROR,
+		 "%.*s is not a valid universal character",
+		 (int) (str - base), base);
+      result = 1;
+    }
+  else if (identifier_pos)
+    {
+      int validity = ucn_valid_in_identifier (pfile, result);
+
+      if (validity == 0)
+	cpp_error (pfile, CPP_DL_ERROR,
+		   "universal character %.*s is not valid in an identifier",
+		   (int) (str - base), base);
+      else if (validity == 2 && identifier_pos == 1)
+	cpp_error (pfile, CPP_DL_ERROR,
+   "universal character %.*s is not valid at the start of an identifier",
+		   (int) (str - base), base);
+    }
+
+  if (result == 0)
+    result = 1;
+
+  return result;
+}
+
+/* Convert an UCN, pointed to by FROM, to UTF-8 encoding, then translate
+   it to the execution character set and write the result into TBUF.
+   An advanced pointer is returned.  Issues all relevant diagnostics.  */
+
+
+static const uchar *
+convert_ucn (cpp_reader *pfile, const uchar *from, const uchar *limit,
+	     struct _cpp_strbuf *tbuf, bool wide)
+{
+  cppchar_t ucn;
+  uchar buf[6];
+  uchar *bufp = buf;
+  size_t bytesleft = 6;
+  int rval;
+  struct cset_converter cvt
+    = wide ? pfile->wide_cset_desc : pfile->narrow_cset_desc;
+
+  from++;  /* Skip u/U.  */
+  ucn = _cpp_valid_ucn (pfile, &from, limit, 0);
+
+  rval = one_cppchar_to_utf8 (ucn, &bufp, &bytesleft);
+  if (rval)
+    {
+      errno = rval;
+      cpp_errno (pfile, CPP_DL_ERROR,
+		 "converting UCN to source character set");
+    }
+  else if (!APPLY_CONVERSION (cvt, buf, 6 - bytesleft, tbuf))
+    cpp_errno (pfile, CPP_DL_ERROR,
+	       "converting UCN to execution character set");
+
+  return from;
+}
+
+static void
+emit_numeric_escape (cpp_reader *pfile, cppchar_t n,
+		     struct _cpp_strbuf *tbuf, bool wide)
+{
+  if (wide)
+    {
+      /* We have to render this into the target byte order, which may not
+	 be our byte order.  */
+      bool bigend = CPP_OPTION (pfile, bytes_big_endian);
+      size_t width = CPP_OPTION (pfile, wchar_precision);
+      size_t cwidth = CPP_OPTION (pfile, char_precision);
+      size_t cmask = width_to_mask (cwidth);
+      size_t nbwc = width / cwidth;
+      size_t i;
+      size_t off = tbuf->len;
+      cppchar_t c;
+
+      if (tbuf->len + nbwc > tbuf->asize)
+	{
+	  tbuf->asize += OUTBUF_BLOCK_SIZE;
+	  tbuf->text = xrealloc (tbuf->text, tbuf->asize);
+	}
+
+      for (i = 0; i < nbwc; i++)
+	{
+	  c = n & cmask;
+	  n >>= cwidth;
+	  tbuf->text[off + (bigend ? nbwc - i - 1 : i)] = c;
+	}
+      tbuf->len += nbwc;
+    }
+  else
+    {
+      if (tbuf->len + 1 > tbuf->asize)
+	{
+	  tbuf->asize += OUTBUF_BLOCK_SIZE;
+	  tbuf->text = xrealloc (tbuf->text, tbuf->asize);
+	}
+      tbuf->text[tbuf->len++] = n;
+    }
+}
+
+/* Convert a hexadecimal escape, pointed to by FROM, to the execution
+   character set and write it into the string buffer TBUF.  Returns an
+   advanced pointer, and issues diagnostics as necessary.
+   No character set translation occurs; this routine always produces the
+   execution-set character with numeric value equal to the given hex
+   number.  You can, e.g. generate surrogate pairs this way.  */
+static const uchar *
+convert_hex (cpp_reader *pfile, const uchar *from, const uchar *limit,
+	     struct _cpp_strbuf *tbuf, bool wide)
+{
+  cppchar_t c, n = 0, overflow = 0;
+  int digits_found = 0;
+  size_t width = (wide ? CPP_OPTION (pfile, wchar_precision)
+		  : CPP_OPTION (pfile, char_precision));
+  size_t mask = width_to_mask (width);
+
+  if (CPP_WTRADITIONAL (pfile))
+    cpp_error (pfile, CPP_DL_WARNING,
+	       "the meaning of '\\x' is different in traditional C");
+
+  from++;  /* Skip 'x'.  */
+  while (from < limit)
+    {
+      c = *from;
+      if (! hex_p (c))
+	break;
+      from++;
+      overflow |= n ^ (n << 4 >> 4);
+      n = (n << 4) + hex_value (c);
+      digits_found = 1;
+    }
+
+  if (!digits_found)
+    {
+      cpp_error (pfile, CPP_DL_ERROR,
+		 "\\x used with no following hex digits");
+      return from;
+    }
+
+  if (overflow | (n != (n & mask)))
+    {
+      cpp_error (pfile, CPP_DL_PEDWARN,
+		 "hex escape sequence out of range");
+      n &= mask;
+    }
+
+  emit_numeric_escape (pfile, n, tbuf, wide);
+
+  return from;
+}
+
+/* Convert an octal escape, pointed to by FROM, to the execution
+   character set and write it into the string buffer TBUF.  Returns an
+   advanced pointer, and issues diagnostics as necessary.
+   No character set translation occurs; this routine always produces the
+   execution-set character with numeric value equal to the given octal
+   number.  */
+static const uchar *
+convert_oct (cpp_reader *pfile, const uchar *from, const uchar *limit,
+	     struct _cpp_strbuf *tbuf, bool wide)
+{
+  size_t count = 0;
+  cppchar_t c, n = 0;
+  size_t width = (wide ? CPP_OPTION (pfile, wchar_precision)
+		  : CPP_OPTION (pfile, char_precision));
+  size_t mask = width_to_mask (width);
+  bool overflow = false;
+
+  while (from < limit && count++ < 3)
+    {
+      c = *from;
+      if (c < '0' || c > '7')
+	break;
+      from++;
+      overflow |= n ^ (n << 3 >> 3);
+      n = (n << 3) + c - '0';
+    }
+
+  if (n != (n & mask))
+    {
+      cpp_error (pfile, CPP_DL_PEDWARN,
+		 "octal escape sequence out of range");
+      n &= mask;
+    }
+
+  emit_numeric_escape (pfile, n, tbuf, wide);
+
+  return from;
+}
+
+/* Convert an escape sequence (pointed to by FROM) to its value on
+   the target, and to the execution character set.  Do not scan past
+   LIMIT.  Write the converted value into TBUF.  Returns an advanced
+   pointer.  Handles all relevant diagnostics.  */
+static const uchar *
+convert_escape (cpp_reader *pfile, const uchar *from, const uchar *limit,
+		struct _cpp_strbuf *tbuf, bool wide)
+{
+  /* Values of \a \b \e \f \n \r \t \v respectively.  */
+#if HOST_CHARSET == HOST_CHARSET_ASCII
+  static const uchar charconsts[] = {  7,  8, 27, 12, 10, 13,  9, 11 };
+#elif HOST_CHARSET == HOST_CHARSET_EBCDIC
+  static const uchar charconsts[] = { 47, 22, 39, 12, 21, 13,  5, 11 };
+#else
+#error "unknown host character set"
+#endif
+
+  uchar c;
+  struct cset_converter cvt
+    = wide ? pfile->wide_cset_desc : pfile->narrow_cset_desc;
+
+  c = *from;
+  switch (c)
+    {
+      /* UCNs, hex escapes, and octal escapes are processed separately.  */
+    case 'u': case 'U':
+      return convert_ucn (pfile, from, limit, tbuf, wide);
+
+    case 'x':
+      return convert_hex (pfile, from, limit, tbuf, wide);
+      break;
+
+    case '0':  case '1':  case '2':  case '3':
+    case '4':  case '5':  case '6':  case '7':
+      return convert_oct (pfile, from, limit, tbuf, wide);
+
+      /* Various letter escapes.  Get the appropriate host-charset
+	 value into C.  */
+    case '\\': case '\'': case '"': case '?': break;
+
+    case '(': case '{': case '[': case '%':
+      /* '\(', etc, can be used at the beginning of a line in a long
+	 string split onto multiple lines with \-newline, to prevent
+	 Emacs or other text editors from getting confused.  '\%' can
+	 be used to prevent SCCS from mangling printf format strings.  */
+      if (CPP_PEDANTIC (pfile))
+	goto unknown;
+      break;
+
+    case 'b': c = charconsts[1];  break;
+    case 'f': c = charconsts[3];  break;
+    case 'n': c = charconsts[4];  break;
+    case 'r': c = charconsts[5];  break;
+    case 't': c = charconsts[6];  break;
+    case 'v': c = charconsts[7];  break;
+
+    case 'a':
+      if (CPP_WTRADITIONAL (pfile))
+	cpp_error (pfile, CPP_DL_WARNING,
+		   "the meaning of '\\a' is different in traditional C");
+      c = charconsts[0];
+      break;
+
+    case 'e': case 'E':
+      if (CPP_PEDANTIC (pfile))
+	cpp_error (pfile, CPP_DL_PEDWARN,
+		   "non-ISO-standard escape sequence, '\\%c'", (int) c);
+      c = charconsts[2];
+      break;
+
+    default:
+    unknown:
+      if (ISGRAPH (c))
+	cpp_error (pfile, CPP_DL_PEDWARN,
+		   "unknown escape sequence '\\%c'", (int) c);
+      else
+	cpp_error (pfile, CPP_DL_PEDWARN,
+		   "unknown escape sequence: '\\%03o'", (int) c);
+    }
+
+  /* Now convert what we have to the execution character set.  */
+  if (!APPLY_CONVERSION (cvt, &c, 1, tbuf))
+    cpp_errno (pfile, CPP_DL_ERROR,
+	       "converting escape sequence to execution character set");
+
+  return from + 1;
+}
+
+/* FROM is an array of cpp_string structures of length COUNT.  These
+   are to be converted from the source to the execution character set,
+   escape sequences translated, and finally all are to be
+   concatenated.  WIDE indicates whether or not to produce a wide
+   string.  The result is written into TO.  Returns true for success,
+   false for failure.  */
+bool
+cpp_interpret_string (cpp_reader *pfile, const cpp_string *from, size_t count,
+		      cpp_string *to, bool wide)
+{
+  struct _cpp_strbuf tbuf;
+  const uchar *p, *base, *limit;
+  size_t i;
+  struct cset_converter cvt
+    = wide ? pfile->wide_cset_desc : pfile->narrow_cset_desc;
+
+  tbuf.asize = MAX (OUTBUF_BLOCK_SIZE, from->len);
+  tbuf.text = xmalloc (tbuf.asize);
+  tbuf.len = 0;
+
+  for (i = 0; i < count; i++)
+    {
+      p = from[i].text;
+      if (*p == 'L') p++;
+      p++; /* Skip leading quote.  */
+      limit = from[i].text + from[i].len - 1; /* Skip trailing quote.  */
+
+      for (;;)
+	{
+	  base = p;
+	  while (p < limit && *p != '\\')
+	    p++;
+	  if (p > base)
+	    {
+	      /* We have a run of normal characters; these can be fed
+		 directly to convert_cset.  */
+	      if (!APPLY_CONVERSION (cvt, base, p - base, &tbuf))
+		goto fail;
+	    }
+	  if (p == limit)
+	    break;
+
+	  p = convert_escape (pfile, p + 1, limit, &tbuf, wide);
+	}
+    }
+  /* NUL-terminate the 'to' buffer and translate it to a cpp_string
+     structure.  */
+  emit_numeric_escape (pfile, 0, &tbuf, wide);
+  tbuf.text = xrealloc (tbuf.text, tbuf.len);
+  to->text = tbuf.text;
+  to->len = tbuf.len;
+  return true;
+
+ fail:
+  cpp_errno (pfile, CPP_DL_ERROR, "converting to execution character set");
+  free (tbuf.text);
+  return false;
+}
+
+/* Subroutine of do_line and do_linemarker.  Convert escape sequences
+   in a string, but do not perform character set conversion.  */
+bool
+_cpp_interpret_string_notranslate (cpp_reader *pfile, const cpp_string *in,
+				   cpp_string *out)
+{
+  struct cset_converter save_narrow_cset_desc = pfile->narrow_cset_desc;
+  bool retval;
+
+  pfile->narrow_cset_desc.func = convert_no_conversion;
+  pfile->narrow_cset_desc.cd = (iconv_t) -1;
+
+  retval = cpp_interpret_string (pfile, in, 1, out, false);
+
+  pfile->narrow_cset_desc = save_narrow_cset_desc;
+  return retval;
+}
+
+
+/* Subroutine of cpp_interpret_charconst which performs the conversion
+   to a number, for narrow strings.  STR is the string structure returned
+   by cpp_interpret_string.  PCHARS_SEEN and UNSIGNEDP are as for
+   cpp_interpret_charconst.  */
+static cppchar_t
+narrow_str_to_charconst (cpp_reader *pfile, cpp_string str,
+			 unsigned int *pchars_seen, int *unsignedp)
+{
+  size_t width = CPP_OPTION (pfile, char_precision);
+  size_t max_chars = CPP_OPTION (pfile, int_precision) / width;
+  size_t mask = width_to_mask (width);
+  size_t i;
+  cppchar_t result, c;
+  bool unsigned_p;
+
+  /* The value of a multi-character character constant, or a
+     single-character character constant whose representation in the
+     execution character set is more than one byte long, is
+     implementation defined.  This implementation defines it to be the
+     number formed by interpreting the byte sequence in memory as a
+     big-endian binary number.  If overflow occurs, the high bytes are
+     lost, and a warning is issued.
+
+     We don't want to process the NUL terminator handed back by
+     cpp_interpret_string.  */
+  result = 0;
+  for (i = 0; i < str.len - 1; i++)
+    {
+      c = str.text[i] & mask;
+      if (width < BITS_PER_CPPCHAR_T)
+	result = (result << width) | c;
+      else
+	result = c;
+    }
+
+  if (i > max_chars)
+    {
+      i = max_chars;
+      cpp_error (pfile, CPP_DL_WARNING,
+		 "character constant too long for its type");
+    }
+  else if (i > 1 && CPP_OPTION (pfile, warn_multichar))
+    cpp_error (pfile, CPP_DL_WARNING, "multi-character character constant");
+
+  /* Multichar constants are of type int and therefore signed.  */
+  if (i > 1)
+    unsigned_p = 0;
+  else
+    unsigned_p = CPP_OPTION (pfile, unsigned_char);
+
+  /* Truncate the constant to its natural width, and simultaneously
+     sign- or zero-extend to the full width of cppchar_t.
+     For single-character constants, the value is WIDTH bits wide.
+     For multi-character constants, the value is INT_PRECISION bits wide.  */
+  if (i > 1)
+    width = CPP_OPTION (pfile, int_precision);
+  if (width < BITS_PER_CPPCHAR_T)
+    {
+      mask = ((cppchar_t) 1 << width) - 1;
+      if (unsigned_p || !(result & (1 << (width - 1))))
+	result &= mask;
+      else
+	result |= ~mask;
+    }
+  *pchars_seen = i;
+  *unsignedp = unsigned_p;
+  return result;
+}
+
+/* Subroutine of cpp_interpret_charconst which performs the conversion
+   to a number, for wide strings.  STR is the string structure returned
+   by cpp_interpret_string.  PCHARS_SEEN and UNSIGNEDP are as for
+   cpp_interpret_charconst.  */
+static cppchar_t
+wide_str_to_charconst (cpp_reader *pfile, cpp_string str,
+		       unsigned int *pchars_seen, int *unsignedp)
+{
+  bool bigend = CPP_OPTION (pfile, bytes_big_endian);
+  size_t width = CPP_OPTION (pfile, wchar_precision);
+  size_t cwidth = CPP_OPTION (pfile, char_precision);
+  size_t mask = width_to_mask (width);
+  size_t cmask = width_to_mask (cwidth);
+  size_t nbwc = width / cwidth;
+  size_t off, i;
+  cppchar_t result = 0, c;
+
+  /* This is finicky because the string is in the target's byte order,
+     which may not be our byte order.  Only the last character, ignoring
+     the NUL terminator, is relevant.  */
+  off = str.len - (nbwc * 2);
+  result = 0;
+  for (i = 0; i < nbwc; i++)
+    {
+      c = bigend ? str.text[off + i] : str.text[off + nbwc - i - 1];
+      result = (result << cwidth) | (c & cmask);
+    }
+
+  /* Wide character constants have type wchar_t, and a single
+     character exactly fills a wchar_t, so a multi-character wide
+     character constant is guaranteed to overflow.  */
+  if (off > 0)
+    cpp_error (pfile, CPP_DL_WARNING,
+	       "character constant too long for its type");
+
+  /* Truncate the constant to its natural width, and simultaneously
+     sign- or zero-extend to the full width of cppchar_t.  */
+  if (width < BITS_PER_CPPCHAR_T)
+    {
+      if (CPP_OPTION (pfile, unsigned_wchar) || !(result & (1 << (width - 1))))
+	result &= mask;
+      else
+	result |= ~mask;
+    }
+
+  *unsignedp = CPP_OPTION (pfile, unsigned_wchar);
+  *pchars_seen = 1;
+  return result;
+}
+
+/* Interpret a (possibly wide) character constant in TOKEN.
+   PCHARS_SEEN points to a variable that is filled in with the number
+   of characters seen, and UNSIGNEDP to a variable that indicates
+   whether the result has signed type.  */
+cppchar_t
+cpp_interpret_charconst (cpp_reader *pfile, const cpp_token *token,
+			 unsigned int *pchars_seen, int *unsignedp)
+{
+  cpp_string str = { 0, 0 };
+  bool wide = (token->type == CPP_WCHAR);
+  cppchar_t result;
+
+  /* an empty constant will appear as L'' or '' */
+  if (token->val.str.len == (size_t) (2 + wide))
+    {
+      cpp_error (pfile, CPP_DL_ERROR, "empty character constant");
+      return 0;
+    }
+  else if (!cpp_interpret_string (pfile, &token->val.str, 1, &str, wide))
+    return 0;
+
+  if (wide)
+    result = wide_str_to_charconst (pfile, str, pchars_seen, unsignedp);
+  else
+    result = narrow_str_to_charconst (pfile, str, pchars_seen, unsignedp);
+
+  if (str.text != token->val.str.text)
+    free ((void *)str.text);
+
+  return result;
+}
+
+uchar *
+_cpp_convert_input (cpp_reader *pfile, const char *input_charset,
+		    uchar *input, size_t size, size_t len, off_t *st_size)
+{
+  struct cset_converter input_cset;
+  struct _cpp_strbuf to;
+
+  input_cset = init_iconv_desc (pfile, SOURCE_CHARSET, input_charset);
+  if (input_cset.func == convert_no_conversion)
+    {
+      to.text = input;
+      to.asize = size;
+      to.len = len;
+    }
+  else
+    {
+      to.asize = MAX (65536, len);
+      to.text = xmalloc (to.asize);
+      to.len = 0;
+
+      if (!APPLY_CONVERSION (input_cset, input, len, &to))
+	cpp_error (pfile, CPP_DL_ERROR,
+		   "failure to convert %s to %s",
+		   CPP_OPTION (pfile, input_charset), SOURCE_CHARSET);
+
+      free (input);
+    }
+
+  /* Clean up the mess.  */
+  if (input_cset.func == convert_using_iconv)
+    iconv_close (input_cset.cd);
+
+  /* Resize buffer if we allocated substantially too much, or if we
+     haven't enough space for the \n-terminator.  */
+  if (to.len + 4096 < to.asize || to.len >= to.asize)
+    to.text = xrealloc (to.text, to.len + 1);
+
+  to.text[to.len] = '\n';
+  *st_size = to.len;
+  return to.text;
+}
+
+const char *
+_cpp_default_encoding (void)
+{
+  const char *current_encoding = NULL;
+
+#if defined (HAVE_LOCALE_H) && defined (HAVE_LANGINFO_CODESET)
+  setlocale (LC_CTYPE, "");
+  current_encoding = nl_langinfo (CODESET);
+#endif
+  if (current_encoding == NULL || *current_encoding == '\0')
+    current_encoding = SOURCE_CHARSET;
+
+  return current_encoding;
+}