CbC/CbC_gcc: libcpp/charset.c comparison

comparison libcpp/charset.c @ 0:a06113de4d67

first commit

author	kent <kent@cr.ie.u-ryukyu.ac.jp>
date	Fri, 17 Jul 2009 14:47:48 +0900
parents
children	77e2b8dfacca

comparison

equal deleted inserted replaced

--1:000000000000
+:a06113de4d67
+/* CPP Library - charsets
+Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2006, 2008, 2009
+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 3, 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; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+#include "config.h"
+#include "system.h"
+#include "cpplib.h"
+#include "internal.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"
+#define LAST_POSSIBLY_BASIC_SOURCE_CHAR 0x7e
+#elif HOST_CHARSET == HOST_CHARSET_EBCDIC
+#define SOURCE_CHARSET "UTF-EBCDIC"
+#define LAST_POSSIBLY_BASIC_SOURCE_CHAR 0xFF
+#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 = XRESIZEVEC (uchar, 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 = XRESIZEVEC (uchar, 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
+#define CONVERT_ICONV_GROW_BUFFER \
+do { \
+outbytesleft += OUTBUF_BLOCK_SIZE; \
+to->asize += OUTBUF_BLOCK_SIZE; \
+to->text = XRESIZEVEC (uchar, to->text, to->asize); \
+outbuf = (char *)to->text + to->asize - outbytesleft; \
+} while (0)
+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))
+	{
+	  /* Close out any shift states, returning to the initial state.  */
+	  if (iconv (cd, 0, 0, &outbuf, &outbytesleft) == (size_t)-1)
+	    {
+	      if (errno != E2BIG)
+		return false;
+	      CONVERT_ICONV_GROW_BUFFER;
+	      if (iconv (cd, 0, 0, &outbuf, &outbytesleft) == (size_t)-1)
+		return false;
+	    }
+	  to->len = to->asize - outbytesleft;
+	  return true;
+	}
+if (errno != E2BIG)
+	return false;
+CONVERT_ICONV_GROW_BUFFER;
+}
+}
+#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;
+ret.width = -1;
+return ret;
+}
+pair = (char *) 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;
+	ret.width = -1;
+	return ret;
+}
+/* No custom converter - try iconv.  */
+if (HAVE_ICONV)
+{
+ret.func = convert_using_iconv;
+ret.cd = iconv_open (to, from);
+ret.width = -1;
+if (ret.cd == (iconv_t) -1)
+	{
+	  if (errno == EINVAL)
+	    cpp_error (pfile, CPP_DL_ERROR, /* FIXME 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, /* FIXME: 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;
+ret.width = -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->narrow_cset_desc.width = CPP_OPTION (pfile, char_precision);
+pfile->char16_cset_desc = init_iconv_desc (pfile,
+					     be ? "UTF-16BE" : "UTF-16LE",
+					     SOURCE_CHARSET);
+pfile->char16_cset_desc.width = 16;
+pfile->char32_cset_desc = init_iconv_desc (pfile,
+					     be ? "UTF-32BE" : "UTF-32LE",
+					     SOURCE_CHARSET);
+pfile->char32_cset_desc.width = 32;
+pfile->wide_cset_desc = init_iconv_desc (pfile, wcset, SOURCE_CHARSET);
+pfile->wide_cset_desc.width = CPP_OPTION (pfile, wchar_precision);
+}
+/* Destroy iconv(3) descriptors set up by cpp_init_iconv, if necessary.  */
+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 for use by a full compiler.  C is a character taken
+from the *basic* source character set, encoded in the host's
+execution encoding.  Convert it to (the target's) execution
+encoding, and return that value.
+Issues an internal error if C's representation in the narrow
+execution character set fails to be a single-byte value (C99
+5.2.1p3: "The representation of each member of the source and
+execution character sets shall fit in a byte.")  May also issue an
+internal error if C fails to be a member of the basic source
+character set (testing this exactly is too hard, especially when
+the host character set is EBCDIC).  */
+cppchar_t
+cpp_host_to_exec_charset (cpp_reader *pfile, cppchar_t c)
+{
+uchar sbuf[1];
+struct _cpp_strbuf tbuf;
+/* This test is merely an approximation, but it suffices to catch
+the most important thing, which is that we don't get handed a
+character outside the unibyte range of the host character set.  */
+if (c > LAST_POSSIBLY_BASIC_SOURCE_CHAR)
+{
+cpp_error (pfile, CPP_DL_ICE,
+		 "character 0x%lx is not in the basic source character set\n",
+		 (unsigned long)c);
+return 0;
+}
+/* Being a character in the unibyte range of the host character set,
+we can safely splat it into a one-byte buffer and trust that that
+is a well-formed string.  */
+sbuf[0] = c;
+/* This should never need to reallocate, but just in case... */
+tbuf.asize = 1;
+tbuf.text = XNEWVEC (uchar, tbuf.asize);
+tbuf.len = 0;
+if (!APPLY_CONVERSION (pfile->narrow_cset_desc, sbuf, 1, &tbuf))
+{
+cpp_errno (pfile, CPP_DL_ICE, "converting to execution character set");
+return 0;
+}
+if (tbuf.len != 1)
+{
+cpp_error (pfile, CPP_DL_ICE,
+		 "character 0x%lx is not unibyte in execution character set",
+		 (unsigned long)c);
+return 0;
+}
+c = tbuf.text[0];
+free(tbuf.text);
+return c;
+}
+/* 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;
+}
+/* A large table of unicode character information.  */
+enum {
+/* Valid in a C99 identifier?  */
+C99 = 1,
+/* Valid in a C99 identifier, but not as the first character?  */
+DIG = 2,
+/* Valid in a C++ identifier?  */
+CXX = 4,
+/* NFC representation is not valid in an identifier?  */
+CID = 8,
+/* Might be valid NFC form?  */
+NFC = 16,
+/* Might be valid NFKC form?  */
+NKC = 32,
+/* Certain preceding characters might make it not valid NFC/NKFC form?  */
+CTX = 64
+};
+static const struct {
+/* Bitmap of flags above.  */
+unsigned char flags;
+/* Combining class of the character.  */
+unsigned char combine;
+/* Last character in the range described by this entry.  */
+unsigned short end;
+} ucnranges[] = {
+#include "ucnid.h"
+};
+/* 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.  Also update NST for C if returning nonzero.  The
+algorithm is a simple binary search on the table defined in
+ucnid.h.  */
+static int
+ucn_valid_in_identifier (cpp_reader *pfile, cppchar_t c,
+			 struct normalize_state *nst)
+{
+int mn, mx, md;
+if (c > 0xFFFF)
+return 0;
+mn = 0;
+mx = ARRAY_SIZE (ucnranges) - 1;
+while (mx != mn)
+{
+md = (mn + mx) / 2;
+if (c <= ucnranges[md].end)
+	mx = md;
+else
+	mn = md + 1;
+}
+/* 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 (! (ucnranges[mn].flags & (C99 | CXX)))
+return 0;
+if (CPP_PEDANTIC (pfile)
+&& ((CPP_OPTION (pfile, c99) && !(ucnranges[mn].flags & C99))
+	  || (CPP_OPTION (pfile, cplusplus)
+	      && !(ucnranges[mn].flags & CXX))))
+return 0;
+/* Update NST.  */
+if (ucnranges[mn].combine != 0 && ucnranges[mn].combine < nst->prev_class)
+nst->level = normalized_none;
+else if (ucnranges[mn].flags & CTX)
+{
+bool safe;
+cppchar_t p = nst->previous;
+/* Easy cases from Bengali, Oriya, Tamil, Jannada, and Malayalam.  */
+if (c == 0x09BE)
+	safe = p != 0x09C7;  /* Use 09CB instead of 09C7 09BE.  */
+else if (c == 0x0B3E)
+	safe = p != 0x0B47;  /* Use 0B4B instead of 0B47 0B3E.  */
+else if (c == 0x0BBE)
+	safe = p != 0x0BC6 && p != 0x0BC7;  /* Use 0BCA/0BCB instead.  */
+else if (c == 0x0CC2)
+	safe = p != 0x0CC6;  /* Use 0CCA instead of 0CC6 0CC2.  */
+else if (c == 0x0D3E)
+	safe = p != 0x0D46 && p != 0x0D47;  /* Use 0D4A/0D4B instead.  */
+/* For Hangul, characters in the range AC00-D7A3 are NFC/NFKC,
+	 and are combined algorithmically from a sequence of the form
+	 1100-1112 1161-1175 11A8-11C2
+	 (if the third is not present, it is treated as 11A7, which is not
+	 really a valid character).
+	 Unfortunately, C99 allows (only) the NFC form, but C++ allows
+	 only the combining characters.  */
+else if (c >= 0x1161 && c <= 0x1175)
+	safe = p < 0x1100 || p > 0x1112;
+else if (c >= 0x11A8 && c <= 0x11C2)
+	safe = (p < 0xAC00 || p > 0xD7A3 || (p - 0xAC00) % 28 != 0);
+else
+	{
+	  /* Uh-oh, someone updated ucnid.h without updating this code.  */
+	  cpp_error (pfile, CPP_DL_ICE, "Character %x might not be NFKC", c);
+	  safe = true;
+	}
+if (!safe && c < 0x1161)
+	nst->level = normalized_none;
+else if (!safe)
+	nst->level = MAX (nst->level, normalized_identifier_C);
+}
+else if (ucnranges[mn].flags & NKC)
+;
+else if (ucnranges[mn].flags & NFC)
+nst->level = MAX (nst->level, normalized_C);
+else if (ucnranges[mn].flags & CID)
+nst->level = MAX (nst->level, normalized_identifier_C);
+else
+nst->level = normalized_none;
+nst->previous = c;
+nst->prev_class = ucnranges[mn].combine;
+/* In C99, UCN digits may not begin identifiers.  */
+if (CPP_OPTION (pfile, c99) && (ucnranges[mn].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 the
+UCN has not been consumed.
+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,
+		struct normalize_state *nst)
+{
+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
+{
+cpp_error (pfile, CPP_DL_ICE, "In _cpp_valid_ucn but not a UCN");
+length = 4;
+}
+result = 0;
+do
+{
+c = *str;
+if (!ISXDIGIT (c))
+	break;
+str++;
+result = (result << 4) + hex_value (c);
+}
+while (--length && str < limit);
+/* Partial UCNs are not valid in strings, but decompose into
+multiple tokens in identifiers, so we can't give a helpful
+error message in that case.  */
+if (length && identifier_pos)
+return 0;
+*pstr = str;
+if (length)
+{
+cpp_error (pfile, CPP_DL_ERROR,
+		 "incomplete universal character name %.*s",
+		 (int) (str - base), base);
+result = 1;
+}
+/* The standard permits $, @ and ` to be specified as UCNs.  We use
+hex escapes so that this also works with EBCDIC hosts.  */
+else if ((result < 0xa0
+	    && (result != 0x24 && result != 0x40 && result != 0x60))
+	   || (result & 0x80000000)
+	   || (result >= 0xD800 && result <= 0xDFFF))
+{
+cpp_error (pfile, CPP_DL_ERROR,
+		 "%.*s is not a valid universal character",
+		 (int) (str - base), base);
+result = 1;
+}
+else if (identifier_pos && result == 0x24
+	   && CPP_OPTION (pfile, dollars_in_ident))
+{
+if (CPP_OPTION (pfile, warn_dollars) && !pfile->state.skipping)
+	{
+	  CPP_OPTION (pfile, warn_dollars) = 0;
+	  cpp_error (pfile, CPP_DL_PEDWARN, "'$' in identifier or number");
+	}
+NORMALIZE_STATE_UPDATE_IDNUM (nst);
+}
+else if (identifier_pos)
+{
+int validity = ucn_valid_in_identifier (pfile, result, nst);
+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, struct cset_converter cvt)
+{
+cppchar_t ucn;
+uchar buf[6];
+uchar *bufp = buf;
+size_t bytesleft = 6;
+int rval;
+struct normalize_state nst = INITIAL_NORMALIZE_STATE;
+from++;  /* Skip u/U.  */
+ucn = _cpp_valid_ucn (pfile, &from, limit, 0, &nst);
+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;
+}
+/* Subroutine of convert_hex and convert_oct.  N is the representation
+in the execution character set of a numeric escape; write it into the
+string buffer TBUF and update the end-of-string pointer therein.  WIDE
+is true if it's a wide string that's being assembled in TBUF.  This
+function issues no diagnostics and never fails.  */
+static void
+emit_numeric_escape (cpp_reader *pfile, cppchar_t n,
+		     struct _cpp_strbuf *tbuf, struct cset_converter cvt)
+{
+size_t width = cvt.width;
+if (width != CPP_OPTION (pfile, char_precision))
+{
+/* 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 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 = XRESIZEVEC (uchar, 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
+{
+/* Note: this code does not handle the case where the target
+	 and host have a different number of bits in a byte.  */
+if (tbuf->len + 1 > tbuf->asize)
+	{
+	  tbuf->asize += OUTBUF_BLOCK_SIZE;
+	  tbuf->text = XRESIZEVEC (uchar, 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, struct cset_converter cvt)
+{
+cppchar_t c, n = 0, overflow = 0;
+int digits_found = 0;
+size_t width = cvt.width;
+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, cvt);
+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, struct cset_converter cvt)
+{
+size_t count = 0;
+cppchar_t c, n = 0;
+size_t width = cvt.width;
+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, cvt);
+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, struct cset_converter cvt)
+{
+/* 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;
+c = *from;
+switch (c)
+{
+/* UCNs, hex escapes, and octal escapes are processed separately.  */
+case 'u': case 'U':
+return convert_ucn (pfile, from, limit, tbuf, cvt);
+case 'x':
+return convert_hex (pfile, from, limit, tbuf, cvt);
+break;
+case '0':  case '1':  case '2':  case '3':
+case '4':  case '5':  case '6':  case '7':
+return convert_oct (pfile, from, limit, tbuf, cvt);
+/* 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
+	{
+	  /* diagnostic.c does not support "%03o".  When it does, this
+	     code can use %03o directly in the diagnostic again.  */
+	  char buf[32];
+	  sprintf(buf, "%03o", (int) c);
+	  cpp_error (pfile, CPP_DL_PEDWARN,
+		     "unknown escape sequence: '\\%s'", buf);
+	}
+}
+/* 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;
+}
+/* TYPE is a token type.  The return value is the conversion needed to
+convert from source to execution character set for the given type. */
+static struct cset_converter
+converter_for_type (cpp_reader *pfile, enum cpp_ttype type)
+{
+switch (type)
+{
+default:
+	return pfile->narrow_cset_desc;
+case CPP_CHAR16:
+case CPP_STRING16:
+	return pfile->char16_cset_desc;
+case CPP_CHAR32:
+case CPP_STRING32:
+	return pfile->char32_cset_desc;
+case CPP_WCHAR:
+case CPP_WSTRING:
+	return pfile->wide_cset_desc;
+}
+}
+/* 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,  enum cpp_ttype type)
+{
+struct _cpp_strbuf tbuf;
+const uchar *p, *base, *limit;
+size_t i;
+struct cset_converter cvt = converter_for_type (pfile, type);
+tbuf.asize = MAX (OUTBUF_BLOCK_SIZE, from->len);
+tbuf.text = XNEWVEC (uchar, tbuf.asize);
+tbuf.len = 0;
+for (i = 0; i < count; i++)
+{
+p = from[i].text;
+if (*p == 'L' || *p == 'u' || *p == 'U') 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, cvt);
+	}
+}
+/* NUL-terminate the 'to' buffer and translate it to a cpp_string
+structure.  */
+emit_numeric_escape (pfile, 0, &tbuf, cvt);
+tbuf.text = XRESIZEVEC (uchar, 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 *from,
+				  size_t count,	cpp_string *to,
+				  enum cpp_ttype type ATTRIBUTE_UNUSED)
+{
+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;
+pfile->narrow_cset_desc.width = CPP_OPTION (pfile, char_precision);
+retval = cpp_interpret_string (pfile, from, count, to, CPP_STRING);
+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.  TYPE is the token type.  */
+static cppchar_t
+wide_str_to_charconst (cpp_reader *pfile, cpp_string str,
+		       unsigned int *pchars_seen, int *unsignedp,
+		       enum cpp_ttype type)
+{
+bool bigend = CPP_OPTION (pfile, bytes_big_endian);
+size_t width = converter_for_type (pfile, type).width;
+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 (str.len > nbwc * 2)
+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 (type == CPP_CHAR16 || type == CPP_CHAR32
+	  || CPP_OPTION (pfile, unsigned_wchar)
+	  || !(result & (1 << (width - 1))))
+	result &= mask;
+else
+	result |= ~mask;
+}
+if (type == CPP_CHAR16 || type == CPP_CHAR32
+|| CPP_OPTION (pfile, unsigned_wchar))
+*unsignedp = 1;
+else
+*unsignedp = 0;
+*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_CHAR);
+cppchar_t result;
+/* an empty constant will appear as L'', u'', U'' 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, token->type))
+return 0;
+if (wide)
+result = wide_str_to_charconst (pfile, str, pchars_seen, unsignedp,
+				    token->type);
+else
+result = narrow_str_to_charconst (pfile, str, pchars_seen, unsignedp);
+if (str.text != token->val.str.text)
+free ((void *)str.text);
+return result;
+}
+/* Convert an identifier denoted by ID and LEN, which might contain
+UCN escapes, to the source character set, either UTF-8 or
+UTF-EBCDIC.  Assumes that the identifier is actually a valid identifier.  */
+cpp_hashnode *
+_cpp_interpret_identifier (cpp_reader *pfile, const uchar *id, size_t len)
+{
+/* It turns out that a UCN escape always turns into fewer characters
+than the escape itself, so we can allocate a temporary in advance.  */
+uchar * buf = (uchar *) alloca (len + 1);
+uchar * bufp = buf;
+size_t idp;
+for (idp = 0; idp < len; idp++)
+if (id[idp] != '\\')
+*bufp++ = id[idp];
+else
+{
+	unsigned length = id[idp+1] == 'u' ? 4 : 8;
+	cppchar_t value = 0;
+	size_t bufleft = len - (bufp - buf);
+	int rval;
+	idp += 2;
+	while (length && idp < len && ISXDIGIT (id[idp]))
+	  {
+	    value = (value << 4) + hex_value (id[idp]);
+	    idp++;
+	    length--;
+	  }
+	idp--;
+	/* Special case for EBCDIC: if the identifier contains
+	   a '$' specified using a UCN, translate it to EBCDIC.  */
+	if (value == 0x24)
+	  {
+	    *bufp++ = '$';
+	    continue;
+	  }
+	rval = one_cppchar_to_utf8 (value, &bufp, &bufleft);
+	if (rval)
+	  {
+	    errno = rval;
+	    cpp_errno (pfile, CPP_DL_ERROR,
+		       "converting UCN to source character set");
+	    break;
+	  }
+}
+return CPP_HASHNODE (ht_lookup (pfile->hash_table,
+				  buf, bufp - buf, HT_ALLOC));
+}
+/* Convert an input buffer (containing the complete contents of one
+source file) from INPUT_CHARSET to the source character set.  INPUT
+points to the input buffer, SIZE is its allocated size, and LEN is
+the length of the meaningful data within the buffer.  The
+translated buffer is returned, *ST_SIZE is set to the length of
+the meaningful data within the translated buffer, and *BUFFER_START
+is set to the start of the returned buffer.  *BUFFER_START may
+differ from the return value in the case of a BOM or other ignored
+marker information.
+INPUT is expected to have been allocated with xmalloc.  This
+function will either set *BUFFER_START to INPUT, or free it and set
+*BUFFER_START to a pointer to another xmalloc-allocated block of
+memory.  */
+uchar *
+_cpp_convert_input (cpp_reader *pfile, const char *input_charset,
+		    uchar *input, size_t size, size_t len,
+		    const unsigned char **buffer_start, off_t *st_size)
+{
+struct cset_converter input_cset;
+struct _cpp_strbuf to;
+unsigned char *buffer;
+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 = XNEWVEC (uchar, 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 = XRESIZEVEC (uchar, to.text, to.len + 1);
+/* If the file is using old-school Mac line endings (\r only),
+terminate with another \r, not an \n, so that we do not mistake
+the \r\n sequence for a single DOS line ending and erroneously
+issue the "No newline at end of file" diagnostic.  */
+if (to.len && to.text[to.len - 1] == '\r')
+to.text[to.len] = '\r';
+else
+to.text[to.len] = '\n';
+buffer = to.text;
+*st_size = to.len;
+#if HOST_CHARSET == HOST_CHARSET_ASCII
+/* The HOST_CHARSET test just above ensures that the source charset
+is UTF-8.  So, ignore a UTF-8 BOM if we see one.  Note that
+glib'c UTF-8 iconv() provider (as of glibc 2.7) does not ignore a
+BOM -- however, even if it did, we would still need this code due
+to the 'convert_no_conversion' case.  */
+if (to.len >= 3 && to.text[0] == 0xef && to.text[1] == 0xbb
+&& to.text[2] == 0xbf)
+{
+*st_size -= 3;
+buffer += 3;
+}
+#endif
+*buffer_start = to.text;
+return buffer;
+}
+/* Decide on the default encoding to assume for input files.  */
+const char *
+_cpp_default_encoding (void)
+{
+const char *current_encoding = NULL;
+/* We disable this because the default codeset is 7-bit ASCII on
+most platforms, and this causes conversion failures on every
+file in GCC that happens to have one of the upper 128 characters
+in it -- most likely, as part of the name of a contributor.
+We should definitely recognize in-band markers of file encoding,
+like:
+- the appropriate Unicode byte-order mark (FE FF) to recognize
+UTF16 and UCS4 (in both big-endian and little-endian flavors)
+and UTF8
+- a "#i", "#d", "/ *", "//", " #p" or "#p" (for #pragma) to
+distinguish ASCII and EBCDIC.
+- now we can parse something like "#pragma GCC encoding <xyz>
+on the first line, or even Emacs/VIM's mode line tags (there's
+a problem here in that VIM uses the last line, and Emacs has
+its more elaborate "local variables" convention).
+- investigate whether Java has another common convention, which
+would be friendly to support.
+(Zack Weinberg and Paolo Bonzini, May 20th 2004)  */
+#if defined (HAVE_LOCALE_H) && defined (HAVE_LANGINFO_CODESET) && 0
+setlocale (LC_CTYPE, "");
+current_encoding = nl_langinfo (CODESET);
+#endif
+if (current_encoding == NULL || *current_encoding == '\0')
+current_encoding = SOURCE_CHARSET;
+return current_encoding;
+}

Mercurial > hg > CbC > CbC_gcc

comparison libcpp/charset.c @ 0:a06113de4d67