| /* CPP Library - charsets |
| Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2006, 2008, 2009, |
| 2010 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, 0x03, 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->utf8_cset_desc = init_iconv_desc (pfile, "UTF-8", SOURCE_CHARSET); |
| pfile->utf8_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->utf8_cset_desc.func == convert_using_iconv) |
| iconv_close (pfile->utf8_cset_desc.cd); |
| if (pfile->char16_cset_desc.func == convert_using_iconv) |
| iconv_close (pfile->char16_cset_desc.cd); |
| if (pfile->char32_cset_desc.func == convert_using_iconv) |
| iconv_close (pfile->char32_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 corresponds to a surrogate code point |
| (in the range 0xD800-0xDFFF, inclusive), the program is ill-formed. |
| Additionally, if the hexadecimal value for a universal-character-name |
| outside a character or string literal corresponds to a control character |
| (in either of the ranges 0x00-0x1F or 0x7F-0x9F, both inclusive) or to a |
| character in the basic source character set, the program is ill-formed. |
| |
| C99 6.4.3: A universal character name shall not specify a character |
| whose short identifier is less than 00A0 other than 0024 ($), 0040 (@), |
| or 0060 (`), nor one in the range D800 through DFFF inclusive. |
| |
| *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_warning (pfile, CPP_W_TRADITIONAL, |
| "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 C99 standard permits $, @ and ` to be specified as UCNs. We use |
| hex escapes so that this also works with EBCDIC hosts. |
| C++0x permits everything below 0xa0 within literals; |
| ucn_valid_in_identifier will complain about identifiers. */ |
| else if ((result < 0xa0 |
| && !CPP_OPTION (pfile, cplusplus) |
| && (result != 0x24 && result != 0x40 && result != 0x60)) |
| || (result & 0x80000000) |
| || (result >= 0xD800 && result <= 0xDFFF)) |
| { |
| cpp_error (pfile, CPP_DL_ERROR, |
| "%.*s is not a valid universal character", |
| (int) (str - base), base); |
| result = 1; |
| } |
| else if (identifier_pos && result == 0x24 |
| && CPP_OPTION (pfile, dollars_in_ident)) |
| { |
| if (CPP_OPTION (pfile, warn_dollars) && !pfile->state.skipping) |
| { |
| CPP_OPTION (pfile, warn_dollars) = 0; |
| cpp_error (pfile, CPP_DL_PEDWARN, "'$' 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_warning (pfile, CPP_W_TRADITIONAL, |
| "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_warning (pfile, CPP_W_TRADITIONAL, |
| "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_UTF8STRING: |
| return pfile->utf8_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 == 'u') |
| { |
| if (*++p == '8') |
| p++; |
| } |
| else if (*p == 'L' || *p == 'U') p++; |
| if (*p == 'R') |
| { |
| const uchar *prefix; |
| |
| /* Skip over 'R"'. */ |
| p += 2; |
| prefix = p; |
| while (*p != '(') |
| p++; |
| p++; |
| limit = from[i].text + from[i].len; |
| if (limit >= p + (p - prefix) + 1) |
| limit -= (p - prefix) + 1; |
| |
| /* Raw strings are all normal characters; these can be fed |
| directly to convert_cset. */ |
| if (!APPLY_CONVERSION (cvt, p, limit - p, &tbuf)) |
| goto fail; |
| |
| continue; |
| } |
| |
| 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_warning (pfile, CPP_W_MULTICHAR, "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; |
| } |