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2cbf1359 | 1 | /* CPP Library - charsets |
f1717362 | 2 | Copyright (C) 1998-2016 Free Software Foundation, Inc. |
2cbf1359 | 3 | |
4 | Broken out of c-lex.c Apr 2003, adding valid C99 UCN ranges. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU General Public License as published by the | |
6bc9506f | 8 | Free Software Foundation; either version 3, or (at your option) any |
2cbf1359 | 9 | later version. |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
6bc9506f | 17 | along with this program; see the file COPYING3. If not see |
18 | <http://www.gnu.org/licenses/>. */ | |
2cbf1359 | 19 | |
20 | #include "config.h" | |
21 | #include "system.h" | |
2cbf1359 | 22 | #include "cpplib.h" |
d856c8a6 | 23 | #include "internal.h" |
ebc03810 | 24 | |
25 | /* Character set handling for C-family languages. | |
26 | ||
27 | Terminological note: In what follows, "charset" or "character set" | |
28 | will be taken to mean both an abstract set of characters and an | |
29 | encoding for that set. | |
30 | ||
31 | The C99 standard discusses two character sets: source and execution. | |
32 | The source character set is used for internal processing in translation | |
33 | phases 1 through 4; the execution character set is used thereafter. | |
34 | Both are required by 5.2.1.2p1 to be multibyte encodings, not wide | |
35 | character encodings (see 3.7.2, 3.7.3 for the standardese meanings | |
36 | of these terms). Furthermore, the "basic character set" (listed in | |
37 | 5.2.1p3) is to be encoded in each with values one byte wide, and is | |
38 | to appear in the initial shift state. | |
39 | ||
40 | It is not explicitly mentioned, but there is also a "wide execution | |
41 | character set" used to encode wide character constants and wide | |
42 | string literals; this is supposed to be the result of applying the | |
43 | standard library function mbstowcs() to an equivalent narrow string | |
44 | (6.4.5p5). However, the behavior of hexadecimal and octal | |
45 | \-escapes is at odds with this; they are supposed to be translated | |
46 | directly to wchar_t values (6.4.4.4p5,6). | |
47 | ||
48 | The source character set is not necessarily the character set used | |
49 | to encode physical source files on disk; translation phase 1 converts | |
50 | from whatever that encoding is to the source character set. | |
51 | ||
52 | The presence of universal character names in C99 (6.4.3 et seq.) | |
53 | forces the source character set to be isomorphic to ISO 10646, | |
54 | that is, Unicode. There is no such constraint on the execution | |
55 | character set; note also that the conversion from source to | |
56 | execution character set does not occur for identifiers (5.1.1.2p1#5). | |
57 | ||
58 | For convenience of implementation, the source character set's | |
59 | encoding of the basic character set should be identical to the | |
60 | execution character set OF THE HOST SYSTEM's encoding of the basic | |
61 | character set, and it should not be a state-dependent encoding. | |
62 | ||
63 | cpplib uses UTF-8 or UTF-EBCDIC for the source character set, | |
64 | depending on whether the host is based on ASCII or EBCDIC (see | |
65 | respectively Unicode section 2.3/ISO10646 Amendment 2, and Unicode | |
d22d187e | 66 | Technical Report #16). With limited exceptions, it relies on the |
67 | system library's iconv() primitive to do charset conversion | |
68 | (specified in SUSv2). */ | |
ebc03810 | 69 | |
70 | #if !HAVE_ICONV | |
71 | /* Make certain that the uses of iconv(), iconv_open(), iconv_close() | |
72 | below, which are guarded only by if statements with compile-time | |
73 | constant conditions, do not cause link errors. */ | |
74 | #define iconv_open(x, y) (errno = EINVAL, (iconv_t)-1) | |
c22d1e61 | 75 | #define iconv(a,b,c,d,e) (errno = EINVAL, (size_t)-1) |
d22d187e | 76 | #define iconv_close(x) (void)0 |
764a4290 | 77 | #define ICONV_CONST |
ebc03810 | 78 | #endif |
79 | ||
80 | #if HOST_CHARSET == HOST_CHARSET_ASCII | |
81 | #define SOURCE_CHARSET "UTF-8" | |
624d37a6 | 82 | #define LAST_POSSIBLY_BASIC_SOURCE_CHAR 0x7e |
ebc03810 | 83 | #elif HOST_CHARSET == HOST_CHARSET_EBCDIC |
84 | #define SOURCE_CHARSET "UTF-EBCDIC" | |
624d37a6 | 85 | #define LAST_POSSIBLY_BASIC_SOURCE_CHAR 0xFF |
ebc03810 | 86 | #else |
87 | #error "Unrecognized basic host character set" | |
88 | #endif | |
89 | ||
d22d187e | 90 | #ifndef EILSEQ |
91 | #define EILSEQ EINVAL | |
92 | #endif | |
93 | ||
9a432f9a | 94 | /* This structure is used for a resizable string buffer throughout. */ |
f579c40a | 95 | /* Don't call it strbuf, as that conflicts with unistd.h on systems |
e9efa031 | 96 | such as DYNIX/ptx where unistd.h includes stropts.h. */ |
f579c40a | 97 | struct _cpp_strbuf |
ebc03810 | 98 | { |
99 | uchar *text; | |
100 | size_t asize; | |
101 | size_t len; | |
102 | }; | |
103 | ||
104 | /* This is enough to hold any string that fits on a single 80-column | |
105 | line, even if iconv quadruples its size (e.g. conversion from | |
9a432f9a | 106 | ASCII to UTF-32) rounded up to a power of two. */ |
ebc03810 | 107 | #define OUTBUF_BLOCK_SIZE 256 |
108 | ||
9a432f9a | 109 | /* Conversions between UTF-8 and UTF-16/32 are implemented by custom |
110 | logic. This is because a depressing number of systems lack iconv, | |
111 | or have have iconv libraries that do not do these conversions, so | |
112 | we need a fallback implementation for them. To ensure the fallback | |
113 | doesn't break due to neglect, it is used on all systems. | |
114 | ||
115 | UTF-32 encoding is nice and simple: a four-byte binary number, | |
116 | constrained to the range 00000000-7FFFFFFF to avoid questions of | |
117 | signedness. We do have to cope with big- and little-endian | |
118 | variants. | |
119 | ||
120 | UTF-16 encoding uses two-byte binary numbers, again in big- and | |
121 | little-endian variants, for all values in the 00000000-0000FFFF | |
122 | range. Values in the 00010000-0010FFFF range are encoded as pairs | |
123 | of two-byte numbers, called "surrogate pairs": given a number S in | |
124 | this range, it is mapped to a pair (H, L) as follows: | |
125 | ||
126 | H = (S - 0x10000) / 0x400 + 0xD800 | |
127 | L = (S - 0x10000) % 0x400 + 0xDC00 | |
128 | ||
129 | Two-byte values in the D800...DFFF range are ill-formed except as a | |
130 | component of a surrogate pair. Even if the encoding within a | |
131 | two-byte value is little-endian, the H member of the surrogate pair | |
132 | comes first. | |
133 | ||
134 | There is no way to encode values in the 00110000-7FFFFFFF range, | |
135 | which is not currently a problem as there are no assigned code | |
136 | points in that range; however, the author expects that it will | |
137 | eventually become necessary to abandon UTF-16 due to this | |
138 | limitation. Note also that, because of these pairs, UTF-16 does | |
139 | not meet the requirements of the C standard for a wide character | |
140 | encoding (see 3.7.3 and 6.4.4.4p11). | |
141 | ||
142 | UTF-8 encoding looks like this: | |
143 | ||
144 | value range encoded as | |
145 | 00000000-0000007F 0xxxxxxx | |
146 | 00000080-000007FF 110xxxxx 10xxxxxx | |
147 | 00000800-0000FFFF 1110xxxx 10xxxxxx 10xxxxxx | |
148 | 00010000-001FFFFF 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx | |
149 | 00200000-03FFFFFF 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx | |
150 | 04000000-7FFFFFFF 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx | |
151 | ||
152 | Values in the 0000D800 ... 0000DFFF range (surrogates) are invalid, | |
153 | which means that three-byte sequences ED xx yy, with A0 <= xx <= BF, | |
154 | never occur. Note also that any value that can be encoded by a | |
155 | given row of the table can also be encoded by all successive rows, | |
156 | but this is not done; only the shortest possible encoding for any | |
157 | given value is valid. For instance, the character 07C0 could be | |
158 | encoded as any of DF 80, E0 9F 80, F0 80 9F 80, F8 80 80 9F 80, or | |
159 | FC 80 80 80 9F 80. Only the first is valid. | |
160 | ||
161 | An implementation note: the transformation from UTF-16 to UTF-8, or | |
162 | vice versa, is easiest done by using UTF-32 as an intermediary. */ | |
163 | ||
164 | /* Internal primitives which go from an UTF-8 byte stream to native-endian | |
165 | UTF-32 in a cppchar_t, or vice versa; this avoids an extra marshal/unmarshal | |
166 | operation in several places below. */ | |
167 | static inline int | |
168 | one_utf8_to_cppchar (const uchar **inbufp, size_t *inbytesleftp, | |
169 | cppchar_t *cp) | |
170 | { | |
49a657d9 | 171 | static const uchar masks[6] = { 0x7F, 0x1F, 0x0F, 0x07, 0x03, 0x01 }; |
9a432f9a | 172 | static const uchar patns[6] = { 0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC }; |
787c3d1a | 173 | |
9a432f9a | 174 | cppchar_t c; |
175 | const uchar *inbuf = *inbufp; | |
176 | size_t nbytes, i; | |
177 | ||
178 | if (*inbytesleftp < 1) | |
179 | return EINVAL; | |
180 | ||
181 | c = *inbuf; | |
182 | if (c < 0x80) | |
183 | { | |
184 | *cp = c; | |
185 | *inbytesleftp -= 1; | |
186 | *inbufp += 1; | |
187 | return 0; | |
188 | } | |
189 | ||
190 | /* The number of leading 1-bits in the first byte indicates how many | |
191 | bytes follow. */ | |
192 | for (nbytes = 2; nbytes < 7; nbytes++) | |
193 | if ((c & ~masks[nbytes-1]) == patns[nbytes-1]) | |
194 | goto found; | |
195 | return EILSEQ; | |
196 | found: | |
197 | ||
198 | if (*inbytesleftp < nbytes) | |
199 | return EINVAL; | |
200 | ||
201 | c = (c & masks[nbytes-1]); | |
202 | inbuf++; | |
203 | for (i = 1; i < nbytes; i++) | |
204 | { | |
205 | cppchar_t n = *inbuf++; | |
206 | if ((n & 0xC0) != 0x80) | |
207 | return EILSEQ; | |
208 | c = ((c << 6) + (n & 0x3F)); | |
209 | } | |
210 | ||
211 | /* Make sure the shortest possible encoding was used. */ | |
212 | if (c <= 0x7F && nbytes > 1) return EILSEQ; | |
213 | if (c <= 0x7FF && nbytes > 2) return EILSEQ; | |
214 | if (c <= 0xFFFF && nbytes > 3) return EILSEQ; | |
215 | if (c <= 0x1FFFFF && nbytes > 4) return EILSEQ; | |
216 | if (c <= 0x3FFFFFF && nbytes > 5) return EILSEQ; | |
217 | ||
218 | /* Make sure the character is valid. */ | |
219 | if (c > 0x7FFFFFFF || (c >= 0xD800 && c <= 0xDFFF)) return EILSEQ; | |
220 | ||
221 | *cp = c; | |
222 | *inbufp = inbuf; | |
223 | *inbytesleftp -= nbytes; | |
224 | return 0; | |
225 | } | |
226 | ||
227 | static inline int | |
228 | one_cppchar_to_utf8 (cppchar_t c, uchar **outbufp, size_t *outbytesleftp) | |
229 | { | |
230 | static const uchar masks[6] = { 0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC }; | |
231 | static const uchar limits[6] = { 0x80, 0xE0, 0xF0, 0xF8, 0xFC, 0xFE }; | |
232 | size_t nbytes; | |
233 | uchar buf[6], *p = &buf[6]; | |
234 | uchar *outbuf = *outbufp; | |
235 | ||
236 | nbytes = 1; | |
237 | if (c < 0x80) | |
238 | *--p = c; | |
239 | else | |
240 | { | |
241 | do | |
242 | { | |
243 | *--p = ((c & 0x3F) | 0x80); | |
244 | c >>= 6; | |
245 | nbytes++; | |
246 | } | |
247 | while (c >= 0x3F || (c & limits[nbytes-1])); | |
248 | *--p = (c | masks[nbytes-1]); | |
249 | } | |
250 | ||
251 | if (*outbytesleftp < nbytes) | |
252 | return E2BIG; | |
253 | ||
254 | while (p < &buf[6]) | |
255 | *outbuf++ = *p++; | |
256 | *outbytesleftp -= nbytes; | |
257 | *outbufp = outbuf; | |
258 | return 0; | |
259 | } | |
260 | ||
261 | /* The following four functions transform one character between the two | |
262 | encodings named in the function name. All have the signature | |
263 | int (*)(iconv_t bigend, const uchar **inbufp, size_t *inbytesleftp, | |
264 | uchar **outbufp, size_t *outbytesleftp) | |
265 | ||
266 | BIGEND must have the value 0 or 1, coerced to (iconv_t); it is | |
267 | interpreted as a boolean indicating whether big-endian or | |
268 | little-endian encoding is to be used for the member of the pair | |
269 | that is not UTF-8. | |
270 | ||
271 | INBUFP, INBYTESLEFTP, OUTBUFP, OUTBYTESLEFTP work exactly as they | |
272 | do for iconv. | |
273 | ||
274 | The return value is either 0 for success, or an errno value for | |
275 | failure, which may be E2BIG (need more space), EILSEQ (ill-formed | |
276 | input sequence), ir EINVAL (incomplete input sequence). */ | |
787c3d1a | 277 | |
9a432f9a | 278 | static inline int |
279 | one_utf8_to_utf32 (iconv_t bigend, const uchar **inbufp, size_t *inbytesleftp, | |
280 | uchar **outbufp, size_t *outbytesleftp) | |
281 | { | |
282 | uchar *outbuf; | |
76be8cce | 283 | cppchar_t s = 0; |
9a432f9a | 284 | int rval; |
285 | ||
286 | /* Check for space first, since we know exactly how much we need. */ | |
287 | if (*outbytesleftp < 4) | |
288 | return E2BIG; | |
289 | ||
290 | rval = one_utf8_to_cppchar (inbufp, inbytesleftp, &s); | |
291 | if (rval) | |
292 | return rval; | |
293 | ||
294 | outbuf = *outbufp; | |
295 | outbuf[bigend ? 3 : 0] = (s & 0x000000FF); | |
296 | outbuf[bigend ? 2 : 1] = (s & 0x0000FF00) >> 8; | |
297 | outbuf[bigend ? 1 : 2] = (s & 0x00FF0000) >> 16; | |
298 | outbuf[bigend ? 0 : 3] = (s & 0xFF000000) >> 24; | |
299 | ||
300 | *outbufp += 4; | |
301 | *outbytesleftp -= 4; | |
302 | return 0; | |
303 | } | |
304 | ||
305 | static inline int | |
306 | one_utf32_to_utf8 (iconv_t bigend, const uchar **inbufp, size_t *inbytesleftp, | |
307 | uchar **outbufp, size_t *outbytesleftp) | |
308 | { | |
309 | cppchar_t s; | |
310 | int rval; | |
311 | const uchar *inbuf; | |
312 | ||
313 | if (*inbytesleftp < 4) | |
314 | return EINVAL; | |
315 | ||
316 | inbuf = *inbufp; | |
317 | ||
318 | s = inbuf[bigend ? 0 : 3] << 24; | |
319 | s += inbuf[bigend ? 1 : 2] << 16; | |
320 | s += inbuf[bigend ? 2 : 1] << 8; | |
321 | s += inbuf[bigend ? 3 : 0]; | |
322 | ||
323 | if (s >= 0x7FFFFFFF || (s >= 0xD800 && s <= 0xDFFF)) | |
324 | return EILSEQ; | |
325 | ||
326 | rval = one_cppchar_to_utf8 (s, outbufp, outbytesleftp); | |
327 | if (rval) | |
328 | return rval; | |
329 | ||
330 | *inbufp += 4; | |
331 | *inbytesleftp -= 4; | |
332 | return 0; | |
333 | } | |
334 | ||
335 | static inline int | |
336 | one_utf8_to_utf16 (iconv_t bigend, const uchar **inbufp, size_t *inbytesleftp, | |
337 | uchar **outbufp, size_t *outbytesleftp) | |
338 | { | |
339 | int rval; | |
9208ebc3 | 340 | cppchar_t s = 0; |
9a432f9a | 341 | const uchar *save_inbuf = *inbufp; |
342 | size_t save_inbytesleft = *inbytesleftp; | |
343 | uchar *outbuf = *outbufp; | |
344 | ||
345 | rval = one_utf8_to_cppchar (inbufp, inbytesleftp, &s); | |
346 | if (rval) | |
347 | return rval; | |
348 | ||
349 | if (s > 0x0010FFFF) | |
350 | { | |
351 | *inbufp = save_inbuf; | |
352 | *inbytesleftp = save_inbytesleft; | |
353 | return EILSEQ; | |
354 | } | |
355 | ||
e6260d89 | 356 | if (s <= 0xFFFF) |
9a432f9a | 357 | { |
358 | if (*outbytesleftp < 2) | |
359 | { | |
360 | *inbufp = save_inbuf; | |
361 | *inbytesleftp = save_inbytesleft; | |
362 | return E2BIG; | |
363 | } | |
364 | outbuf[bigend ? 1 : 0] = (s & 0x00FF); | |
365 | outbuf[bigend ? 0 : 1] = (s & 0xFF00) >> 8; | |
366 | ||
367 | *outbufp += 2; | |
368 | *outbytesleftp -= 2; | |
369 | return 0; | |
370 | } | |
371 | else | |
372 | { | |
373 | cppchar_t hi, lo; | |
374 | ||
375 | if (*outbytesleftp < 4) | |
376 | { | |
377 | *inbufp = save_inbuf; | |
378 | *inbytesleftp = save_inbytesleft; | |
379 | return E2BIG; | |
380 | } | |
381 | ||
382 | hi = (s - 0x10000) / 0x400 + 0xD800; | |
383 | lo = (s - 0x10000) % 0x400 + 0xDC00; | |
384 | ||
385 | /* Even if we are little-endian, put the high surrogate first. | |
386 | ??? Matches practice? */ | |
387 | outbuf[bigend ? 1 : 0] = (hi & 0x00FF); | |
388 | outbuf[bigend ? 0 : 1] = (hi & 0xFF00) >> 8; | |
389 | outbuf[bigend ? 3 : 2] = (lo & 0x00FF); | |
390 | outbuf[bigend ? 2 : 3] = (lo & 0xFF00) >> 8; | |
391 | ||
392 | *outbufp += 4; | |
393 | *outbytesleftp -= 4; | |
394 | return 0; | |
395 | } | |
396 | } | |
397 | ||
398 | static inline int | |
399 | one_utf16_to_utf8 (iconv_t bigend, const uchar **inbufp, size_t *inbytesleftp, | |
400 | uchar **outbufp, size_t *outbytesleftp) | |
401 | { | |
402 | cppchar_t s; | |
403 | const uchar *inbuf = *inbufp; | |
404 | int rval; | |
405 | ||
406 | if (*inbytesleftp < 2) | |
407 | return EINVAL; | |
408 | s = inbuf[bigend ? 0 : 1] << 8; | |
409 | s += inbuf[bigend ? 1 : 0]; | |
410 | ||
411 | /* Low surrogate without immediately preceding high surrogate is invalid. */ | |
412 | if (s >= 0xDC00 && s <= 0xDFFF) | |
413 | return EILSEQ; | |
414 | /* High surrogate must have a following low surrogate. */ | |
415 | else if (s >= 0xD800 && s <= 0xDBFF) | |
416 | { | |
417 | cppchar_t hi = s, lo; | |
418 | if (*inbytesleftp < 4) | |
419 | return EINVAL; | |
420 | ||
421 | lo = inbuf[bigend ? 2 : 3] << 8; | |
422 | lo += inbuf[bigend ? 3 : 2]; | |
423 | ||
424 | if (lo < 0xDC00 || lo > 0xDFFF) | |
425 | return EILSEQ; | |
426 | ||
427 | s = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000; | |
428 | } | |
429 | ||
430 | rval = one_cppchar_to_utf8 (s, outbufp, outbytesleftp); | |
431 | if (rval) | |
432 | return rval; | |
433 | ||
434 | /* Success - update the input pointers (one_cppchar_to_utf8 has done | |
435 | the output pointers for us). */ | |
436 | if (s <= 0xFFFF) | |
437 | { | |
438 | *inbufp += 2; | |
439 | *inbytesleftp -= 2; | |
440 | } | |
441 | else | |
442 | { | |
443 | *inbufp += 4; | |
444 | *inbytesleftp -= 4; | |
445 | } | |
446 | return 0; | |
447 | } | |
448 | ||
449 | /* Helper routine for the next few functions. The 'const' on | |
450 | one_conversion means that we promise not to modify what function is | |
81d47035 | 451 | pointed to, which lets the inliner see through it. */ |
9a432f9a | 452 | |
453 | static inline bool | |
454 | conversion_loop (int (*const one_conversion)(iconv_t, const uchar **, size_t *, | |
455 | uchar **, size_t *), | |
f579c40a | 456 | iconv_t cd, const uchar *from, size_t flen, struct _cpp_strbuf *to) |
9a432f9a | 457 | { |
458 | const uchar *inbuf; | |
459 | uchar *outbuf; | |
460 | size_t inbytesleft, outbytesleft; | |
461 | int rval; | |
462 | ||
463 | inbuf = from; | |
464 | inbytesleft = flen; | |
465 | outbuf = to->text + to->len; | |
466 | outbytesleft = to->asize - to->len; | |
467 | ||
468 | for (;;) | |
469 | { | |
470 | do | |
471 | rval = one_conversion (cd, &inbuf, &inbytesleft, | |
472 | &outbuf, &outbytesleft); | |
473 | while (inbytesleft && !rval); | |
474 | ||
475 | if (__builtin_expect (inbytesleft == 0, 1)) | |
476 | { | |
477 | to->len = to->asize - outbytesleft; | |
478 | return true; | |
479 | } | |
480 | if (rval != E2BIG) | |
481 | { | |
482 | errno = rval; | |
483 | return false; | |
484 | } | |
485 | ||
486 | outbytesleft += OUTBUF_BLOCK_SIZE; | |
487 | to->asize += OUTBUF_BLOCK_SIZE; | |
720aca92 | 488 | to->text = XRESIZEVEC (uchar, to->text, to->asize); |
9a432f9a | 489 | outbuf = to->text + to->asize - outbytesleft; |
490 | } | |
491 | } | |
787c3d1a | 492 | |
9a432f9a | 493 | |
494 | /* These functions convert entire strings between character sets. | |
495 | They all have the signature | |
496 | ||
f579c40a | 497 | bool (*)(iconv_t cd, const uchar *from, size_t flen, struct _cpp_strbuf *to); |
9a432f9a | 498 | |
499 | The input string FROM is converted as specified by the function | |
500 | name plus the iconv descriptor CD (which may be fake), and the | |
501 | result appended to TO. On any error, false is returned, otherwise true. */ | |
502 | ||
503 | /* These four use the custom conversion code above. */ | |
504 | static bool | |
505 | convert_utf8_utf16 (iconv_t cd, const uchar *from, size_t flen, | |
f579c40a | 506 | struct _cpp_strbuf *to) |
9a432f9a | 507 | { |
508 | return conversion_loop (one_utf8_to_utf16, cd, from, flen, to); | |
509 | } | |
510 | ||
511 | static bool | |
512 | convert_utf8_utf32 (iconv_t cd, const uchar *from, size_t flen, | |
f579c40a | 513 | struct _cpp_strbuf *to) |
9a432f9a | 514 | { |
515 | return conversion_loop (one_utf8_to_utf32, cd, from, flen, to); | |
516 | } | |
517 | ||
518 | static bool | |
519 | convert_utf16_utf8 (iconv_t cd, const uchar *from, size_t flen, | |
f579c40a | 520 | struct _cpp_strbuf *to) |
9a432f9a | 521 | { |
522 | return conversion_loop (one_utf16_to_utf8, cd, from, flen, to); | |
523 | } | |
524 | ||
525 | static bool | |
526 | convert_utf32_utf8 (iconv_t cd, const uchar *from, size_t flen, | |
f579c40a | 527 | struct _cpp_strbuf *to) |
9a432f9a | 528 | { |
529 | return conversion_loop (one_utf32_to_utf8, cd, from, flen, to); | |
530 | } | |
531 | ||
532 | /* Identity conversion, used when we have no alternative. */ | |
533 | static bool | |
534 | convert_no_conversion (iconv_t cd ATTRIBUTE_UNUSED, | |
f579c40a | 535 | const uchar *from, size_t flen, struct _cpp_strbuf *to) |
9a432f9a | 536 | { |
537 | if (to->len + flen > to->asize) | |
538 | { | |
539 | to->asize = to->len + flen; | |
3f21cd58 | 540 | to->asize += to->asize / 4; |
720aca92 | 541 | to->text = XRESIZEVEC (uchar, to->text, to->asize); |
9a432f9a | 542 | } |
543 | memcpy (to->text + to->len, from, flen); | |
544 | to->len += flen; | |
545 | return true; | |
546 | } | |
547 | ||
548 | /* And this one uses the system iconv primitive. It's a little | |
549 | different, since iconv's interface is a little different. */ | |
d22d187e | 550 | #if HAVE_ICONV |
2d1f9589 | 551 | |
552 | #define CONVERT_ICONV_GROW_BUFFER \ | |
553 | do { \ | |
554 | outbytesleft += OUTBUF_BLOCK_SIZE; \ | |
555 | to->asize += OUTBUF_BLOCK_SIZE; \ | |
556 | to->text = XRESIZEVEC (uchar, to->text, to->asize); \ | |
557 | outbuf = (char *)to->text + to->asize - outbytesleft; \ | |
558 | } while (0) | |
559 | ||
9a432f9a | 560 | static bool |
561 | convert_using_iconv (iconv_t cd, const uchar *from, size_t flen, | |
f579c40a | 562 | struct _cpp_strbuf *to) |
9a432f9a | 563 | { |
564 | ICONV_CONST char *inbuf; | |
565 | char *outbuf; | |
566 | size_t inbytesleft, outbytesleft; | |
567 | ||
568 | /* Reset conversion descriptor and check that it is valid. */ | |
569 | if (iconv (cd, 0, 0, 0, 0) == (size_t)-1) | |
570 | return false; | |
571 | ||
572 | inbuf = (ICONV_CONST char *)from; | |
573 | inbytesleft = flen; | |
574 | outbuf = (char *)to->text + to->len; | |
575 | outbytesleft = to->asize - to->len; | |
576 | ||
577 | for (;;) | |
578 | { | |
579 | iconv (cd, &inbuf, &inbytesleft, &outbuf, &outbytesleft); | |
580 | if (__builtin_expect (inbytesleft == 0, 1)) | |
581 | { | |
2d1f9589 | 582 | /* Close out any shift states, returning to the initial state. */ |
583 | if (iconv (cd, 0, 0, &outbuf, &outbytesleft) == (size_t)-1) | |
584 | { | |
585 | if (errno != E2BIG) | |
586 | return false; | |
587 | ||
588 | CONVERT_ICONV_GROW_BUFFER; | |
589 | if (iconv (cd, 0, 0, &outbuf, &outbytesleft) == (size_t)-1) | |
590 | return false; | |
591 | } | |
592 | ||
9a432f9a | 593 | to->len = to->asize - outbytesleft; |
594 | return true; | |
595 | } | |
596 | if (errno != E2BIG) | |
597 | return false; | |
598 | ||
2d1f9589 | 599 | CONVERT_ICONV_GROW_BUFFER; |
9a432f9a | 600 | } |
601 | } | |
d22d187e | 602 | #else |
603 | #define convert_using_iconv 0 /* prevent undefined symbol error below */ | |
604 | #endif | |
9a432f9a | 605 | |
606 | /* Arrange for the above custom conversion logic to be used automatically | |
607 | when conversion between a suitable pair of character sets is requested. */ | |
608 | ||
609 | #define APPLY_CONVERSION(CONVERTER, FROM, FLEN, TO) \ | |
610 | CONVERTER.func (CONVERTER.cd, FROM, FLEN, TO) | |
611 | ||
47d6df07 | 612 | struct cpp_conversion |
9a432f9a | 613 | { |
614 | const char *pair; | |
615 | convert_f func; | |
616 | iconv_t fake_cd; | |
617 | }; | |
47d6df07 | 618 | static const struct cpp_conversion conversion_tab[] = { |
9a432f9a | 619 | { "UTF-8/UTF-32LE", convert_utf8_utf32, (iconv_t)0 }, |
620 | { "UTF-8/UTF-32BE", convert_utf8_utf32, (iconv_t)1 }, | |
621 | { "UTF-8/UTF-16LE", convert_utf8_utf16, (iconv_t)0 }, | |
622 | { "UTF-8/UTF-16BE", convert_utf8_utf16, (iconv_t)1 }, | |
623 | { "UTF-32LE/UTF-8", convert_utf32_utf8, (iconv_t)0 }, | |
624 | { "UTF-32BE/UTF-8", convert_utf32_utf8, (iconv_t)1 }, | |
625 | { "UTF-16LE/UTF-8", convert_utf16_utf8, (iconv_t)0 }, | |
626 | { "UTF-16BE/UTF-8", convert_utf16_utf8, (iconv_t)1 }, | |
627 | }; | |
628 | ||
629 | /* Subroutine of cpp_init_iconv: initialize and return a | |
630 | cset_converter structure for conversion from FROM to TO. If | |
631 | iconv_open() fails, issue an error and return an identity | |
632 | converter. Silently return an identity converter if FROM and TO | |
633 | are identical. */ | |
634 | static struct cset_converter | |
ebc03810 | 635 | init_iconv_desc (cpp_reader *pfile, const char *to, const char *from) |
636 | { | |
9a432f9a | 637 | struct cset_converter ret; |
638 | char *pair; | |
639 | size_t i; | |
787c3d1a | 640 | |
9a432f9a | 641 | if (!strcasecmp (to, from)) |
642 | { | |
643 | ret.func = convert_no_conversion; | |
644 | ret.cd = (iconv_t) -1; | |
924bbf02 | 645 | ret.width = -1; |
9a432f9a | 646 | return ret; |
647 | } | |
648 | ||
720aca92 | 649 | pair = (char *) alloca(strlen(to) + strlen(from) + 2); |
ebc03810 | 650 | |
9a432f9a | 651 | strcpy(pair, from); |
652 | strcat(pair, "/"); | |
653 | strcat(pair, to); | |
654 | for (i = 0; i < ARRAY_SIZE (conversion_tab); i++) | |
655 | if (!strcasecmp (pair, conversion_tab[i].pair)) | |
656 | { | |
657 | ret.func = conversion_tab[i].func; | |
658 | ret.cd = conversion_tab[i].fake_cd; | |
924bbf02 | 659 | ret.width = -1; |
9a432f9a | 660 | return ret; |
661 | } | |
ebc03810 | 662 | |
9a432f9a | 663 | /* No custom converter - try iconv. */ |
d22d187e | 664 | if (HAVE_ICONV) |
ebc03810 | 665 | { |
d22d187e | 666 | ret.func = convert_using_iconv; |
667 | ret.cd = iconv_open (to, from); | |
924bbf02 | 668 | ret.width = -1; |
9a432f9a | 669 | |
d22d187e | 670 | if (ret.cd == (iconv_t) -1) |
671 | { | |
672 | if (errno == EINVAL) | |
787c3d1a | 673 | cpp_error (pfile, CPP_DL_ERROR, /* FIXME should be DL_SORRY */ |
d22d187e | 674 | "conversion from %s to %s not supported by iconv", |
675 | from, to); | |
676 | else | |
d80d2074 | 677 | cpp_errno (pfile, CPP_DL_ERROR, "iconv_open"); |
d22d187e | 678 | |
679 | ret.func = convert_no_conversion; | |
680 | } | |
681 | } | |
682 | else | |
683 | { | |
787c3d1a | 684 | cpp_error (pfile, CPP_DL_ERROR, /* FIXME: should be DL_SORRY */ |
d22d187e | 685 | "no iconv implementation, cannot convert from %s to %s", |
686 | from, to); | |
9a432f9a | 687 | ret.func = convert_no_conversion; |
d22d187e | 688 | ret.cd = (iconv_t) -1; |
924bbf02 | 689 | ret.width = -1; |
ebc03810 | 690 | } |
9a432f9a | 691 | return ret; |
ebc03810 | 692 | } |
693 | ||
694 | /* If charset conversion is requested, initialize iconv(3) descriptors | |
695 | for conversion from the source character set to the execution | |
696 | character sets. If iconv is not present in the C library, and | |
697 | conversion is requested, issue an error. */ | |
698 | ||
699 | void | |
700 | cpp_init_iconv (cpp_reader *pfile) | |
701 | { | |
702 | const char *ncset = CPP_OPTION (pfile, narrow_charset); | |
703 | const char *wcset = CPP_OPTION (pfile, wide_charset); | |
704 | const char *default_wcset; | |
705 | ||
706 | bool be = CPP_OPTION (pfile, bytes_big_endian); | |
707 | ||
708 | if (CPP_OPTION (pfile, wchar_precision) >= 32) | |
9a432f9a | 709 | default_wcset = be ? "UTF-32BE" : "UTF-32LE"; |
ebc03810 | 710 | else if (CPP_OPTION (pfile, wchar_precision) >= 16) |
9a432f9a | 711 | default_wcset = be ? "UTF-16BE" : "UTF-16LE"; |
ebc03810 | 712 | else |
713 | /* This effectively means that wide strings are not supported, | |
714 | so don't do any conversion at all. */ | |
715 | default_wcset = SOURCE_CHARSET; | |
716 | ||
d22d187e | 717 | if (!ncset) |
718 | ncset = SOURCE_CHARSET; | |
719 | if (!wcset) | |
720 | wcset = default_wcset; | |
ebc03810 | 721 | |
d22d187e | 722 | pfile->narrow_cset_desc = init_iconv_desc (pfile, ncset, SOURCE_CHARSET); |
924bbf02 | 723 | pfile->narrow_cset_desc.width = CPP_OPTION (pfile, char_precision); |
538ba11a | 724 | pfile->utf8_cset_desc = init_iconv_desc (pfile, "UTF-8", SOURCE_CHARSET); |
725 | pfile->utf8_cset_desc.width = CPP_OPTION (pfile, char_precision); | |
924bbf02 | 726 | pfile->char16_cset_desc = init_iconv_desc (pfile, |
727 | be ? "UTF-16BE" : "UTF-16LE", | |
728 | SOURCE_CHARSET); | |
729 | pfile->char16_cset_desc.width = 16; | |
730 | pfile->char32_cset_desc = init_iconv_desc (pfile, | |
731 | be ? "UTF-32BE" : "UTF-32LE", | |
732 | SOURCE_CHARSET); | |
733 | pfile->char32_cset_desc.width = 32; | |
d22d187e | 734 | pfile->wide_cset_desc = init_iconv_desc (pfile, wcset, SOURCE_CHARSET); |
924bbf02 | 735 | pfile->wide_cset_desc.width = CPP_OPTION (pfile, wchar_precision); |
ebc03810 | 736 | } |
737 | ||
0097f6a2 | 738 | /* Destroy iconv(3) descriptors set up by cpp_init_iconv, if necessary. */ |
ebc03810 | 739 | void |
740 | _cpp_destroy_iconv (cpp_reader *pfile) | |
741 | { | |
742 | if (HAVE_ICONV) | |
743 | { | |
9a432f9a | 744 | if (pfile->narrow_cset_desc.func == convert_using_iconv) |
745 | iconv_close (pfile->narrow_cset_desc.cd); | |
538ba11a | 746 | if (pfile->utf8_cset_desc.func == convert_using_iconv) |
747 | iconv_close (pfile->utf8_cset_desc.cd); | |
748 | if (pfile->char16_cset_desc.func == convert_using_iconv) | |
749 | iconv_close (pfile->char16_cset_desc.cd); | |
750 | if (pfile->char32_cset_desc.func == convert_using_iconv) | |
751 | iconv_close (pfile->char32_cset_desc.cd); | |
9a432f9a | 752 | if (pfile->wide_cset_desc.func == convert_using_iconv) |
753 | iconv_close (pfile->wide_cset_desc.cd); | |
ebc03810 | 754 | } |
755 | } | |
756 | ||
624d37a6 | 757 | /* Utility routine for use by a full compiler. C is a character taken |
758 | from the *basic* source character set, encoded in the host's | |
759 | execution encoding. Convert it to (the target's) execution | |
760 | encoding, and return that value. | |
761 | ||
762 | Issues an internal error if C's representation in the narrow | |
763 | execution character set fails to be a single-byte value (C99 | |
764 | 5.2.1p3: "The representation of each member of the source and | |
765 | execution character sets shall fit in a byte.") May also issue an | |
766 | internal error if C fails to be a member of the basic source | |
767 | character set (testing this exactly is too hard, especially when | |
768 | the host character set is EBCDIC). */ | |
769 | cppchar_t | |
770 | cpp_host_to_exec_charset (cpp_reader *pfile, cppchar_t c) | |
771 | { | |
772 | uchar sbuf[1]; | |
773 | struct _cpp_strbuf tbuf; | |
774 | ||
775 | /* This test is merely an approximation, but it suffices to catch | |
776 | the most important thing, which is that we don't get handed a | |
777 | character outside the unibyte range of the host character set. */ | |
778 | if (c > LAST_POSSIBLY_BASIC_SOURCE_CHAR) | |
779 | { | |
780 | cpp_error (pfile, CPP_DL_ICE, | |
781 | "character 0x%lx is not in the basic source character set\n", | |
782 | (unsigned long)c); | |
783 | return 0; | |
784 | } | |
785 | ||
786 | /* Being a character in the unibyte range of the host character set, | |
787 | we can safely splat it into a one-byte buffer and trust that that | |
788 | is a well-formed string. */ | |
789 | sbuf[0] = c; | |
790 | ||
791 | /* This should never need to reallocate, but just in case... */ | |
792 | tbuf.asize = 1; | |
720aca92 | 793 | tbuf.text = XNEWVEC (uchar, tbuf.asize); |
624d37a6 | 794 | tbuf.len = 0; |
795 | ||
796 | if (!APPLY_CONVERSION (pfile->narrow_cset_desc, sbuf, 1, &tbuf)) | |
797 | { | |
798 | cpp_errno (pfile, CPP_DL_ICE, "converting to execution character set"); | |
799 | return 0; | |
800 | } | |
801 | if (tbuf.len != 1) | |
802 | { | |
803 | cpp_error (pfile, CPP_DL_ICE, | |
804 | "character 0x%lx is not unibyte in execution character set", | |
805 | (unsigned long)c); | |
806 | return 0; | |
807 | } | |
808 | c = tbuf.text[0]; | |
809 | free(tbuf.text); | |
810 | return c; | |
811 | } | |
812 | ||
813 | \f | |
ebc03810 | 814 | |
815 | /* Utility routine that computes a mask of the form 0000...111... with | |
816 | WIDTH 1-bits. */ | |
817 | static inline size_t | |
818 | width_to_mask (size_t width) | |
819 | { | |
820 | width = MIN (width, BITS_PER_CPPCHAR_T); | |
821 | if (width >= CHAR_BIT * sizeof (size_t)) | |
822 | return ~(size_t) 0; | |
823 | else | |
824 | return ((size_t) 1 << width) - 1; | |
825 | } | |
826 | ||
bce47149 | 827 | /* A large table of unicode character information. */ |
828 | enum { | |
829 | /* Valid in a C99 identifier? */ | |
830 | C99 = 1, | |
831 | /* Valid in a C99 identifier, but not as the first character? */ | |
460f52aa | 832 | N99 = 2, |
bce47149 | 833 | /* Valid in a C++ identifier? */ |
834 | CXX = 4, | |
460f52aa | 835 | /* Valid in a C11/C++11 identifier? */ |
836 | C11 = 8, | |
837 | /* Valid in a C11/C++11 identifier, but not as the first character? */ | |
838 | N11 = 16, | |
bce47149 | 839 | /* NFC representation is not valid in an identifier? */ |
460f52aa | 840 | CID = 32, |
bce47149 | 841 | /* Might be valid NFC form? */ |
460f52aa | 842 | NFC = 64, |
bce47149 | 843 | /* Might be valid NFKC form? */ |
460f52aa | 844 | NKC = 128, |
bce47149 | 845 | /* Certain preceding characters might make it not valid NFC/NKFC form? */ |
460f52aa | 846 | CTX = 256 |
bce47149 | 847 | }; |
848 | ||
460f52aa | 849 | struct ucnrange { |
bce47149 | 850 | /* Bitmap of flags above. */ |
460f52aa | 851 | unsigned short flags; |
bce47149 | 852 | /* Combining class of the character. */ |
853 | unsigned char combine; | |
854 | /* Last character in the range described by this entry. */ | |
460f52aa | 855 | unsigned int end; |
bce47149 | 856 | }; |
460f52aa | 857 | #include "ucnid.h" |
bce47149 | 858 | |
ebc03810 | 859 | /* Returns 1 if C is valid in an identifier, 2 if C is valid except at |
860 | the start of an identifier, and 0 if C is not valid in an | |
861 | identifier. We assume C has already gone through the checks of | |
bce47149 | 862 | _cpp_valid_ucn. Also update NST for C if returning nonzero. The |
863 | algorithm is a simple binary search on the table defined in | |
864 | ucnid.h. */ | |
ebc03810 | 865 | |
866 | static int | |
bce47149 | 867 | ucn_valid_in_identifier (cpp_reader *pfile, cppchar_t c, |
868 | struct normalize_state *nst) | |
ebc03810 | 869 | { |
870 | int mn, mx, md; | |
460f52aa | 871 | unsigned short valid_flags, invalid_start_flags; |
ebc03810 | 872 | |
460f52aa | 873 | if (c > 0x10FFFF) |
bce47149 | 874 | return 0; |
875 | ||
876 | mn = 0; | |
877 | mx = ARRAY_SIZE (ucnranges) - 1; | |
878 | while (mx != mn) | |
ebc03810 | 879 | { |
880 | md = (mn + mx) / 2; | |
bce47149 | 881 | if (c <= ucnranges[md].end) |
ebc03810 | 882 | mx = md; |
ebc03810 | 883 | else |
bce47149 | 884 | mn = md + 1; |
ebc03810 | 885 | } |
2cbf1359 | 886 | |
ebc03810 | 887 | /* When -pedantic, we require the character to have been listed by |
888 | the standard for the current language. Otherwise, we accept the | |
460f52aa | 889 | union of the acceptable sets for all supported language versions. */ |
890 | valid_flags = C99 | CXX | C11; | |
891 | if (CPP_PEDANTIC (pfile)) | |
892 | { | |
893 | if (CPP_OPTION (pfile, c11_identifiers)) | |
894 | valid_flags = C11; | |
895 | else if (CPP_OPTION (pfile, c99)) | |
896 | valid_flags = C99; | |
897 | else if (CPP_OPTION (pfile, cplusplus)) | |
898 | valid_flags = CXX; | |
899 | } | |
900 | if (! (ucnranges[mn].flags & valid_flags)) | |
bce47149 | 901 | return 0; |
460f52aa | 902 | if (CPP_OPTION (pfile, c11_identifiers)) |
903 | invalid_start_flags = N11; | |
904 | else if (CPP_OPTION (pfile, c99)) | |
905 | invalid_start_flags = N99; | |
906 | else | |
907 | invalid_start_flags = 0; | |
ebc03810 | 908 | |
bce47149 | 909 | /* Update NST. */ |
910 | if (ucnranges[mn].combine != 0 && ucnranges[mn].combine < nst->prev_class) | |
911 | nst->level = normalized_none; | |
912 | else if (ucnranges[mn].flags & CTX) | |
913 | { | |
914 | bool safe; | |
915 | cppchar_t p = nst->previous; | |
916 | ||
bce47149 | 917 | /* For Hangul, characters in the range AC00-D7A3 are NFC/NFKC, |
918 | and are combined algorithmically from a sequence of the form | |
919 | 1100-1112 1161-1175 11A8-11C2 | |
920 | (if the third is not present, it is treated as 11A7, which is not | |
921 | really a valid character). | |
922 | Unfortunately, C99 allows (only) the NFC form, but C++ allows | |
923 | only the combining characters. */ | |
460f52aa | 924 | if (c >= 0x1161 && c <= 0x1175) |
bce47149 | 925 | safe = p < 0x1100 || p > 0x1112; |
926 | else if (c >= 0x11A8 && c <= 0x11C2) | |
927 | safe = (p < 0xAC00 || p > 0xD7A3 || (p - 0xAC00) % 28 != 0); | |
928 | else | |
460f52aa | 929 | safe = check_nfc (pfile, c, p); |
930 | if (!safe) | |
bce47149 | 931 | { |
460f52aa | 932 | if ((c >= 0x1161 && c <= 0x1175) || (c >= 0x11A8 && c <= 0x11C2)) |
933 | nst->level = MAX (nst->level, normalized_identifier_C); | |
934 | else | |
935 | nst->level = normalized_none; | |
bce47149 | 936 | } |
bce47149 | 937 | } |
938 | else if (ucnranges[mn].flags & NKC) | |
939 | ; | |
940 | else if (ucnranges[mn].flags & NFC) | |
941 | nst->level = MAX (nst->level, normalized_C); | |
942 | else if (ucnranges[mn].flags & CID) | |
943 | nst->level = MAX (nst->level, normalized_identifier_C); | |
944 | else | |
945 | nst->level = normalized_none; | |
460f52aa | 946 | if (ucnranges[mn].combine == 0) |
947 | nst->previous = c; | |
bce47149 | 948 | nst->prev_class = ucnranges[mn].combine; |
949 | ||
460f52aa | 950 | /* In C99, UCN digits may not begin identifiers. In C11 and C++11, |
951 | UCN combining characters may not begin identifiers. */ | |
952 | if (ucnranges[mn].flags & invalid_start_flags) | |
ebc03810 | 953 | return 2; |
954 | ||
955 | return 1; | |
956 | } | |
2cbf1359 | 957 | |
958 | /* [lex.charset]: The character designated by the universal character | |
959 | name \UNNNNNNNN is that character whose character short name in | |
960 | ISO/IEC 10646 is NNNNNNNN; the character designated by the | |
961 | universal character name \uNNNN is that character whose character | |
962 | short name in ISO/IEC 10646 is 0000NNNN. If the hexadecimal value | |
8e83a065 | 963 | for a universal character name corresponds to a surrogate code point |
964 | (in the range 0xD800-0xDFFF, inclusive), the program is ill-formed. | |
965 | Additionally, if the hexadecimal value for a universal-character-name | |
966 | outside a character or string literal corresponds to a control character | |
967 | (in either of the ranges 0x00-0x1F or 0x7F-0x9F, both inclusive) or to a | |
968 | character in the basic source character set, the program is ill-formed. | |
969 | ||
970 | C99 6.4.3: A universal character name shall not specify a character | |
971 | whose short identifier is less than 00A0 other than 0024 ($), 0040 (@), | |
972 | or 0060 (`), nor one in the range D800 through DFFF inclusive. | |
2cbf1359 | 973 | |
974 | *PSTR must be preceded by "\u" or "\U"; it is assumed that the | |
880e4baa | 975 | buffer end is delimited by a non-hex digit. Returns false if the |
976 | UCN has not been consumed, true otherwise. | |
2cbf1359 | 977 | |
880e4baa | 978 | The value of the UCN, whether valid or invalid, is returned in *CP. |
979 | Diagnostics are emitted for invalid values. PSTR is updated to point | |
980 | one beyond the UCN, or to the syntactically invalid character. | |
2cbf1359 | 981 | |
982 | IDENTIFIER_POS is 0 when not in an identifier, 1 for the start of | |
0097f6a2 | 983 | an identifier, or 2 otherwise. */ |
2cbf1359 | 984 | |
880e4baa | 985 | bool |
ebc03810 | 986 | _cpp_valid_ucn (cpp_reader *pfile, const uchar **pstr, |
bce47149 | 987 | const uchar *limit, int identifier_pos, |
880e4baa | 988 | struct normalize_state *nst, cppchar_t *cp) |
2cbf1359 | 989 | { |
990 | cppchar_t result, c; | |
991 | unsigned int length; | |
992 | const uchar *str = *pstr; | |
993 | const uchar *base = str - 2; | |
994 | ||
2cbf1359 | 995 | if (!CPP_OPTION (pfile, cplusplus) && !CPP_OPTION (pfile, c99)) |
d80d2074 | 996 | cpp_error (pfile, CPP_DL_WARNING, |
ebc03810 | 997 | "universal character names are only valid in C++ and C99"); |
806fe15e | 998 | else if (CPP_OPTION (pfile, cpp_warn_c90_c99_compat) > 0 |
890c2e2f | 999 | && !CPP_OPTION (pfile, cplusplus)) |
1000 | cpp_error (pfile, CPP_DL_WARNING, | |
1001 | "C99's universal character names are incompatible with C90"); | |
ebc03810 | 1002 | else if (CPP_WTRADITIONAL (pfile) && identifier_pos == 0) |
3a79f5da | 1003 | cpp_warning (pfile, CPP_W_TRADITIONAL, |
1004 | "the meaning of '\\%c' is different in traditional C", | |
1005 | (int) str[-1]); | |
2cbf1359 | 1006 | |
1007 | if (str[-1] == 'u') | |
1008 | length = 4; | |
1009 | else if (str[-1] == 'U') | |
1010 | length = 8; | |
1011 | else | |
bce47149 | 1012 | { |
1013 | cpp_error (pfile, CPP_DL_ICE, "In _cpp_valid_ucn but not a UCN"); | |
1014 | length = 4; | |
1015 | } | |
2cbf1359 | 1016 | |
1017 | result = 0; | |
1018 | do | |
1019 | { | |
1020 | c = *str; | |
1021 | if (!ISXDIGIT (c)) | |
1022 | break; | |
1023 | str++; | |
1024 | result = (result << 4) + hex_value (c); | |
1025 | } | |
ebc03810 | 1026 | while (--length && str < limit); |
2cbf1359 | 1027 | |
bc65f24f | 1028 | /* Partial UCNs are not valid in strings, but decompose into |
1029 | multiple tokens in identifiers, so we can't give a helpful | |
1030 | error message in that case. */ | |
1031 | if (length && identifier_pos) | |
880e4baa | 1032 | { |
1033 | *cp = 0; | |
1034 | return false; | |
1035 | } | |
1036 | ||
2cbf1359 | 1037 | *pstr = str; |
1038 | if (length) | |
ebc03810 | 1039 | { |
d80d2074 | 1040 | cpp_error (pfile, CPP_DL_ERROR, |
1041 | "incomplete universal character name %.*s", | |
ebc03810 | 1042 | (int) (str - base), base); |
1043 | result = 1; | |
1044 | } | |
8e83a065 | 1045 | /* The C99 standard permits $, @ and ` to be specified as UCNs. We use |
1046 | hex escapes so that this also works with EBCDIC hosts. | |
1047 | C++0x permits everything below 0xa0 within literals; | |
1048 | ucn_valid_in_identifier will complain about identifiers. */ | |
2cbf1359 | 1049 | else if ((result < 0xa0 |
8e83a065 | 1050 | && !CPP_OPTION (pfile, cplusplus) |
2cbf1359 | 1051 | && (result != 0x24 && result != 0x40 && result != 0x60)) |
1052 | || (result & 0x80000000) | |
1053 | || (result >= 0xD800 && result <= 0xDFFF)) | |
1054 | { | |
d80d2074 | 1055 | cpp_error (pfile, CPP_DL_ERROR, |
1056 | "%.*s is not a valid universal character", | |
7d3b0527 | 1057 | (int) (str - base), base); |
ebc03810 | 1058 | result = 1; |
2cbf1359 | 1059 | } |
bb1fa6bb | 1060 | else if (identifier_pos && result == 0x24 |
1061 | && CPP_OPTION (pfile, dollars_in_ident)) | |
1062 | { | |
1063 | if (CPP_OPTION (pfile, warn_dollars) && !pfile->state.skipping) | |
1064 | { | |
1065 | CPP_OPTION (pfile, warn_dollars) = 0; | |
1066 | cpp_error (pfile, CPP_DL_PEDWARN, "'$' in identifier or number"); | |
1067 | } | |
460f52aa | 1068 | NORMALIZE_STATE_UPDATE_IDNUM (nst, result); |
bb1fa6bb | 1069 | } |
2cbf1359 | 1070 | else if (identifier_pos) |
1071 | { | |
bce47149 | 1072 | int validity = ucn_valid_in_identifier (pfile, result, nst); |
2cbf1359 | 1073 | |
1074 | if (validity == 0) | |
d80d2074 | 1075 | cpp_error (pfile, CPP_DL_ERROR, |
2cbf1359 | 1076 | "universal character %.*s is not valid in an identifier", |
7d3b0527 | 1077 | (int) (str - base), base); |
2cbf1359 | 1078 | else if (validity == 2 && identifier_pos == 1) |
d80d2074 | 1079 | cpp_error (pfile, CPP_DL_ERROR, |
2cbf1359 | 1080 | "universal character %.*s is not valid at the start of an identifier", |
7d3b0527 | 1081 | (int) (str - base), base); |
2cbf1359 | 1082 | } |
1083 | ||
880e4baa | 1084 | *cp = result; |
1085 | return true; | |
2cbf1359 | 1086 | } |
1087 | ||
ebc03810 | 1088 | /* Convert an UCN, pointed to by FROM, to UTF-8 encoding, then translate |
1089 | it to the execution character set and write the result into TBUF. | |
9a432f9a | 1090 | An advanced pointer is returned. Issues all relevant diagnostics. */ |
ebc03810 | 1091 | static const uchar * |
1092 | convert_ucn (cpp_reader *pfile, const uchar *from, const uchar *limit, | |
924bbf02 | 1093 | struct _cpp_strbuf *tbuf, struct cset_converter cvt) |
2cbf1359 | 1094 | { |
ebc03810 | 1095 | cppchar_t ucn; |
9a432f9a | 1096 | uchar buf[6]; |
1097 | uchar *bufp = buf; | |
1098 | size_t bytesleft = 6; | |
1099 | int rval; | |
bce47149 | 1100 | struct normalize_state nst = INITIAL_NORMALIZE_STATE; |
9a432f9a | 1101 | |
21dda4ee | 1102 | from++; /* Skip u/U. */ |
880e4baa | 1103 | _cpp_valid_ucn (pfile, &from, limit, 0, &nst, &ucn); |
ebc03810 | 1104 | |
9a432f9a | 1105 | rval = one_cppchar_to_utf8 (ucn, &bufp, &bytesleft); |
1106 | if (rval) | |
ebc03810 | 1107 | { |
9a432f9a | 1108 | errno = rval; |
d80d2074 | 1109 | cpp_errno (pfile, CPP_DL_ERROR, |
1110 | "converting UCN to source character set"); | |
ebc03810 | 1111 | } |
9a432f9a | 1112 | else if (!APPLY_CONVERSION (cvt, buf, 6 - bytesleft, tbuf)) |
d80d2074 | 1113 | cpp_errno (pfile, CPP_DL_ERROR, |
1114 | "converting UCN to execution character set"); | |
ebc03810 | 1115 | |
1116 | return from; | |
1117 | } | |
2cbf1359 | 1118 | |
0097f6a2 | 1119 | /* Subroutine of convert_hex and convert_oct. N is the representation |
1120 | in the execution character set of a numeric escape; write it into the | |
1121 | string buffer TBUF and update the end-of-string pointer therein. WIDE | |
1122 | is true if it's a wide string that's being assembled in TBUF. This | |
1123 | function issues no diagnostics and never fails. */ | |
ebc03810 | 1124 | static void |
1125 | emit_numeric_escape (cpp_reader *pfile, cppchar_t n, | |
924bbf02 | 1126 | struct _cpp_strbuf *tbuf, struct cset_converter cvt) |
ebc03810 | 1127 | { |
924bbf02 | 1128 | size_t width = cvt.width; |
1129 | ||
1130 | if (width != CPP_OPTION (pfile, char_precision)) | |
2cbf1359 | 1131 | { |
ebc03810 | 1132 | /* We have to render this into the target byte order, which may not |
1133 | be our byte order. */ | |
1134 | bool bigend = CPP_OPTION (pfile, bytes_big_endian); | |
ebc03810 | 1135 | size_t cwidth = CPP_OPTION (pfile, char_precision); |
1136 | size_t cmask = width_to_mask (cwidth); | |
1137 | size_t nbwc = width / cwidth; | |
1138 | size_t i; | |
1139 | size_t off = tbuf->len; | |
1140 | cppchar_t c; | |
1141 | ||
1142 | if (tbuf->len + nbwc > tbuf->asize) | |
1143 | { | |
1144 | tbuf->asize += OUTBUF_BLOCK_SIZE; | |
720aca92 | 1145 | tbuf->text = XRESIZEVEC (uchar, tbuf->text, tbuf->asize); |
ebc03810 | 1146 | } |
1147 | ||
1148 | for (i = 0; i < nbwc; i++) | |
1149 | { | |
1150 | c = n & cmask; | |
1151 | n >>= cwidth; | |
1152 | tbuf->text[off + (bigend ? nbwc - i - 1 : i)] = c; | |
1153 | } | |
1154 | tbuf->len += nbwc; | |
2cbf1359 | 1155 | } |
ebc03810 | 1156 | else |
2cbf1359 | 1157 | { |
0097f6a2 | 1158 | /* Note: this code does not handle the case where the target |
1159 | and host have a different number of bits in a byte. */ | |
ebc03810 | 1160 | if (tbuf->len + 1 > tbuf->asize) |
1161 | { | |
1162 | tbuf->asize += OUTBUF_BLOCK_SIZE; | |
720aca92 | 1163 | tbuf->text = XRESIZEVEC (uchar, tbuf->text, tbuf->asize); |
ebc03810 | 1164 | } |
1165 | tbuf->text[tbuf->len++] = n; | |
2cbf1359 | 1166 | } |
ebc03810 | 1167 | } |
2cbf1359 | 1168 | |
ebc03810 | 1169 | /* Convert a hexadecimal escape, pointed to by FROM, to the execution |
1170 | character set and write it into the string buffer TBUF. Returns an | |
1171 | advanced pointer, and issues diagnostics as necessary. | |
1172 | No character set translation occurs; this routine always produces the | |
1173 | execution-set character with numeric value equal to the given hex | |
1174 | number. You can, e.g. generate surrogate pairs this way. */ | |
1175 | static const uchar * | |
1176 | convert_hex (cpp_reader *pfile, const uchar *from, const uchar *limit, | |
924bbf02 | 1177 | struct _cpp_strbuf *tbuf, struct cset_converter cvt) |
ebc03810 | 1178 | { |
1179 | cppchar_t c, n = 0, overflow = 0; | |
1180 | int digits_found = 0; | |
924bbf02 | 1181 | size_t width = cvt.width; |
ebc03810 | 1182 | size_t mask = width_to_mask (width); |
1183 | ||
1184 | if (CPP_WTRADITIONAL (pfile)) | |
3a79f5da | 1185 | cpp_warning (pfile, CPP_W_TRADITIONAL, |
1186 | "the meaning of '\\x' is different in traditional C"); | |
ebc03810 | 1187 | |
21dda4ee | 1188 | from++; /* Skip 'x'. */ |
ebc03810 | 1189 | while (from < limit) |
1190 | { | |
1191 | c = *from; | |
1192 | if (! hex_p (c)) | |
1193 | break; | |
1194 | from++; | |
1195 | overflow |= n ^ (n << 4 >> 4); | |
1196 | n = (n << 4) + hex_value (c); | |
1197 | digits_found = 1; | |
1198 | } | |
2cbf1359 | 1199 | |
ebc03810 | 1200 | if (!digits_found) |
1201 | { | |
d80d2074 | 1202 | cpp_error (pfile, CPP_DL_ERROR, |
ebc03810 | 1203 | "\\x used with no following hex digits"); |
1204 | return from; | |
1205 | } | |
1206 | ||
1207 | if (overflow | (n != (n & mask))) | |
1208 | { | |
d80d2074 | 1209 | cpp_error (pfile, CPP_DL_PEDWARN, |
ebc03810 | 1210 | "hex escape sequence out of range"); |
1211 | n &= mask; | |
1212 | } | |
1213 | ||
924bbf02 | 1214 | emit_numeric_escape (pfile, n, tbuf, cvt); |
ebc03810 | 1215 | |
1216 | return from; | |
1217 | } | |
1218 | ||
1219 | /* Convert an octal escape, pointed to by FROM, to the execution | |
1220 | character set and write it into the string buffer TBUF. Returns an | |
1221 | advanced pointer, and issues diagnostics as necessary. | |
1222 | No character set translation occurs; this routine always produces the | |
1223 | execution-set character with numeric value equal to the given octal | |
1224 | number. */ | |
1225 | static const uchar * | |
1226 | convert_oct (cpp_reader *pfile, const uchar *from, const uchar *limit, | |
924bbf02 | 1227 | struct _cpp_strbuf *tbuf, struct cset_converter cvt) |
ebc03810 | 1228 | { |
1229 | size_t count = 0; | |
1230 | cppchar_t c, n = 0; | |
924bbf02 | 1231 | size_t width = cvt.width; |
ebc03810 | 1232 | size_t mask = width_to_mask (width); |
1233 | bool overflow = false; | |
1234 | ||
1235 | while (from < limit && count++ < 3) | |
1236 | { | |
1237 | c = *from; | |
1238 | if (c < '0' || c > '7') | |
1239 | break; | |
1240 | from++; | |
1241 | overflow |= n ^ (n << 3 >> 3); | |
1242 | n = (n << 3) + c - '0'; | |
1243 | } | |
1244 | ||
1245 | if (n != (n & mask)) | |
1246 | { | |
d80d2074 | 1247 | cpp_error (pfile, CPP_DL_PEDWARN, |
ebc03810 | 1248 | "octal escape sequence out of range"); |
1249 | n &= mask; | |
1250 | } | |
1251 | ||
924bbf02 | 1252 | emit_numeric_escape (pfile, n, tbuf, cvt); |
ebc03810 | 1253 | |
1254 | return from; | |
1255 | } | |
1256 | ||
1257 | /* Convert an escape sequence (pointed to by FROM) to its value on | |
1258 | the target, and to the execution character set. Do not scan past | |
1259 | LIMIT. Write the converted value into TBUF. Returns an advanced | |
1260 | pointer. Handles all relevant diagnostics. */ | |
1261 | static const uchar * | |
1262 | convert_escape (cpp_reader *pfile, const uchar *from, const uchar *limit, | |
924bbf02 | 1263 | struct _cpp_strbuf *tbuf, struct cset_converter cvt) |
ebc03810 | 1264 | { |
1265 | /* Values of \a \b \e \f \n \r \t \v respectively. */ | |
1266 | #if HOST_CHARSET == HOST_CHARSET_ASCII | |
1267 | static const uchar charconsts[] = { 7, 8, 27, 12, 10, 13, 9, 11 }; | |
1268 | #elif HOST_CHARSET == HOST_CHARSET_EBCDIC | |
1269 | static const uchar charconsts[] = { 47, 22, 39, 12, 21, 13, 5, 11 }; | |
1270 | #else | |
1271 | #error "unknown host character set" | |
1272 | #endif | |
1273 | ||
1274 | uchar c; | |
1275 | ||
1276 | c = *from; | |
1277 | switch (c) | |
1278 | { | |
1279 | /* UCNs, hex escapes, and octal escapes are processed separately. */ | |
1280 | case 'u': case 'U': | |
924bbf02 | 1281 | return convert_ucn (pfile, from, limit, tbuf, cvt); |
ebc03810 | 1282 | |
1283 | case 'x': | |
924bbf02 | 1284 | return convert_hex (pfile, from, limit, tbuf, cvt); |
ebc03810 | 1285 | break; |
1286 | ||
1287 | case '0': case '1': case '2': case '3': | |
1288 | case '4': case '5': case '6': case '7': | |
924bbf02 | 1289 | return convert_oct (pfile, from, limit, tbuf, cvt); |
ebc03810 | 1290 | |
1291 | /* Various letter escapes. Get the appropriate host-charset | |
1292 | value into C. */ | |
1293 | case '\\': case '\'': case '"': case '?': break; | |
1294 | ||
1295 | case '(': case '{': case '[': case '%': | |
1296 | /* '\(', etc, can be used at the beginning of a line in a long | |
1297 | string split onto multiple lines with \-newline, to prevent | |
1298 | Emacs or other text editors from getting confused. '\%' can | |
1299 | be used to prevent SCCS from mangling printf format strings. */ | |
1300 | if (CPP_PEDANTIC (pfile)) | |
1301 | goto unknown; | |
1302 | break; | |
1303 | ||
1304 | case 'b': c = charconsts[1]; break; | |
1305 | case 'f': c = charconsts[3]; break; | |
1306 | case 'n': c = charconsts[4]; break; | |
1307 | case 'r': c = charconsts[5]; break; | |
1308 | case 't': c = charconsts[6]; break; | |
1309 | case 'v': c = charconsts[7]; break; | |
1310 | ||
1311 | case 'a': | |
1312 | if (CPP_WTRADITIONAL (pfile)) | |
3a79f5da | 1313 | cpp_warning (pfile, CPP_W_TRADITIONAL, |
1314 | "the meaning of '\\a' is different in traditional C"); | |
ebc03810 | 1315 | c = charconsts[0]; |
1316 | break; | |
1317 | ||
1318 | case 'e': case 'E': | |
1319 | if (CPP_PEDANTIC (pfile)) | |
d80d2074 | 1320 | cpp_error (pfile, CPP_DL_PEDWARN, |
ebc03810 | 1321 | "non-ISO-standard escape sequence, '\\%c'", (int) c); |
1322 | c = charconsts[2]; | |
1323 | break; | |
1324 | ||
1325 | default: | |
1326 | unknown: | |
1327 | if (ISGRAPH (c)) | |
d80d2074 | 1328 | cpp_error (pfile, CPP_DL_PEDWARN, |
ed184982 | 1329 | "unknown escape sequence: '\\%c'", (int) c); |
ebc03810 | 1330 | else |
eb0d20b7 | 1331 | { |
1332 | /* diagnostic.c does not support "%03o". When it does, this | |
1333 | code can use %03o directly in the diagnostic again. */ | |
1334 | char buf[32]; | |
1335 | sprintf(buf, "%03o", (int) c); | |
1336 | cpp_error (pfile, CPP_DL_PEDWARN, | |
1337 | "unknown escape sequence: '\\%s'", buf); | |
1338 | } | |
ebc03810 | 1339 | } |
1340 | ||
1341 | /* Now convert what we have to the execution character set. */ | |
9a432f9a | 1342 | if (!APPLY_CONVERSION (cvt, &c, 1, tbuf)) |
d80d2074 | 1343 | cpp_errno (pfile, CPP_DL_ERROR, |
ebc03810 | 1344 | "converting escape sequence to execution character set"); |
1345 | ||
1346 | return from + 1; | |
1347 | } | |
1348 | \f | |
924bbf02 | 1349 | /* TYPE is a token type. The return value is the conversion needed to |
1350 | convert from source to execution character set for the given type. */ | |
1351 | static struct cset_converter | |
1352 | converter_for_type (cpp_reader *pfile, enum cpp_ttype type) | |
1353 | { | |
1354 | switch (type) | |
1355 | { | |
1356 | default: | |
1357 | return pfile->narrow_cset_desc; | |
30b1ba42 | 1358 | case CPP_UTF8CHAR: |
538ba11a | 1359 | case CPP_UTF8STRING: |
1360 | return pfile->utf8_cset_desc; | |
924bbf02 | 1361 | case CPP_CHAR16: |
1362 | case CPP_STRING16: | |
1363 | return pfile->char16_cset_desc; | |
1364 | case CPP_CHAR32: | |
1365 | case CPP_STRING32: | |
1366 | return pfile->char32_cset_desc; | |
1367 | case CPP_WCHAR: | |
1368 | case CPP_WSTRING: | |
1369 | return pfile->wide_cset_desc; | |
1370 | } | |
1371 | } | |
1372 | ||
ebc03810 | 1373 | /* FROM is an array of cpp_string structures of length COUNT. These |
1374 | are to be converted from the source to the execution character set, | |
1375 | escape sequences translated, and finally all are to be | |
1376 | concatenated. WIDE indicates whether or not to produce a wide | |
1377 | string. The result is written into TO. Returns true for success, | |
1378 | false for failure. */ | |
1379 | bool | |
1380 | cpp_interpret_string (cpp_reader *pfile, const cpp_string *from, size_t count, | |
924bbf02 | 1381 | cpp_string *to, enum cpp_ttype type) |
ebc03810 | 1382 | { |
f579c40a | 1383 | struct _cpp_strbuf tbuf; |
ebc03810 | 1384 | const uchar *p, *base, *limit; |
1385 | size_t i; | |
924bbf02 | 1386 | struct cset_converter cvt = converter_for_type (pfile, type); |
ebc03810 | 1387 | |
1388 | tbuf.asize = MAX (OUTBUF_BLOCK_SIZE, from->len); | |
720aca92 | 1389 | tbuf.text = XNEWVEC (uchar, tbuf.asize); |
ebc03810 | 1390 | tbuf.len = 0; |
1391 | ||
1392 | for (i = 0; i < count; i++) | |
1393 | { | |
1394 | p = from[i].text; | |
538ba11a | 1395 | if (*p == 'u') |
1396 | { | |
1397 | if (*++p == '8') | |
1398 | p++; | |
1399 | } | |
1400 | else if (*p == 'L' || *p == 'U') p++; | |
1401 | if (*p == 'R') | |
1402 | { | |
1403 | const uchar *prefix; | |
1404 | ||
1405 | /* Skip over 'R"'. */ | |
1406 | p += 2; | |
1407 | prefix = p; | |
7fe0ef3a | 1408 | while (*p != '(') |
538ba11a | 1409 | p++; |
1410 | p++; | |
1411 | limit = from[i].text + from[i].len; | |
1412 | if (limit >= p + (p - prefix) + 1) | |
1413 | limit -= (p - prefix) + 1; | |
1414 | ||
3a45011c | 1415 | /* Raw strings are all normal characters; these can be fed |
1416 | directly to convert_cset. */ | |
1417 | if (!APPLY_CONVERSION (cvt, p, limit - p, &tbuf)) | |
1418 | goto fail; | |
538ba11a | 1419 | |
1420 | continue; | |
1421 | } | |
1422 | ||
21dda4ee | 1423 | p++; /* Skip leading quote. */ |
1424 | limit = from[i].text + from[i].len - 1; /* Skip trailing quote. */ | |
ebc03810 | 1425 | |
1426 | for (;;) | |
1427 | { | |
1428 | base = p; | |
1429 | while (p < limit && *p != '\\') | |
1430 | p++; | |
1431 | if (p > base) | |
1432 | { | |
1433 | /* We have a run of normal characters; these can be fed | |
1434 | directly to convert_cset. */ | |
9a432f9a | 1435 | if (!APPLY_CONVERSION (cvt, base, p - base, &tbuf)) |
ebc03810 | 1436 | goto fail; |
1437 | } | |
1438 | if (p == limit) | |
1439 | break; | |
1440 | ||
924bbf02 | 1441 | p = convert_escape (pfile, p + 1, limit, &tbuf, cvt); |
ebc03810 | 1442 | } |
1443 | } | |
1444 | /* NUL-terminate the 'to' buffer and translate it to a cpp_string | |
1445 | structure. */ | |
924bbf02 | 1446 | emit_numeric_escape (pfile, 0, &tbuf, cvt); |
720aca92 | 1447 | tbuf.text = XRESIZEVEC (uchar, tbuf.text, tbuf.len); |
ebc03810 | 1448 | to->text = tbuf.text; |
1449 | to->len = tbuf.len; | |
1450 | return true; | |
1451 | ||
1452 | fail: | |
d80d2074 | 1453 | cpp_errno (pfile, CPP_DL_ERROR, "converting to execution character set"); |
ebc03810 | 1454 | free (tbuf.text); |
1455 | return false; | |
1456 | } | |
9a432f9a | 1457 | |
1458 | /* Subroutine of do_line and do_linemarker. Convert escape sequences | |
1459 | in a string, but do not perform character set conversion. */ | |
1460 | bool | |
7bc95b56 | 1461 | cpp_interpret_string_notranslate (cpp_reader *pfile, const cpp_string *from, |
924bbf02 | 1462 | size_t count, cpp_string *to, |
1463 | enum cpp_ttype type ATTRIBUTE_UNUSED) | |
9a432f9a | 1464 | { |
1465 | struct cset_converter save_narrow_cset_desc = pfile->narrow_cset_desc; | |
1466 | bool retval; | |
1467 | ||
1468 | pfile->narrow_cset_desc.func = convert_no_conversion; | |
1469 | pfile->narrow_cset_desc.cd = (iconv_t) -1; | |
bfa57d81 | 1470 | pfile->narrow_cset_desc.width = CPP_OPTION (pfile, char_precision); |
9a432f9a | 1471 | |
924bbf02 | 1472 | retval = cpp_interpret_string (pfile, from, count, to, CPP_STRING); |
9a432f9a | 1473 | |
1474 | pfile->narrow_cset_desc = save_narrow_cset_desc; | |
1475 | return retval; | |
1476 | } | |
1477 | ||
ebc03810 | 1478 | \f |
1479 | /* Subroutine of cpp_interpret_charconst which performs the conversion | |
1480 | to a number, for narrow strings. STR is the string structure returned | |
1481 | by cpp_interpret_string. PCHARS_SEEN and UNSIGNEDP are as for | |
1482 | cpp_interpret_charconst. */ | |
1483 | static cppchar_t | |
1484 | narrow_str_to_charconst (cpp_reader *pfile, cpp_string str, | |
1485 | unsigned int *pchars_seen, int *unsignedp) | |
1486 | { | |
1487 | size_t width = CPP_OPTION (pfile, char_precision); | |
1488 | size_t max_chars = CPP_OPTION (pfile, int_precision) / width; | |
1489 | size_t mask = width_to_mask (width); | |
1490 | size_t i; | |
1491 | cppchar_t result, c; | |
1492 | bool unsigned_p; | |
1493 | ||
1494 | /* The value of a multi-character character constant, or a | |
1495 | single-character character constant whose representation in the | |
1496 | execution character set is more than one byte long, is | |
1497 | implementation defined. This implementation defines it to be the | |
1498 | number formed by interpreting the byte sequence in memory as a | |
1499 | big-endian binary number. If overflow occurs, the high bytes are | |
1500 | lost, and a warning is issued. | |
1501 | ||
1502 | We don't want to process the NUL terminator handed back by | |
1503 | cpp_interpret_string. */ | |
1504 | result = 0; | |
1505 | for (i = 0; i < str.len - 1; i++) | |
1506 | { | |
1507 | c = str.text[i] & mask; | |
1508 | if (width < BITS_PER_CPPCHAR_T) | |
1509 | result = (result << width) | c; | |
1510 | else | |
1511 | result = c; | |
1512 | } | |
1513 | ||
1514 | if (i > max_chars) | |
1515 | { | |
1516 | i = max_chars; | |
d80d2074 | 1517 | cpp_error (pfile, CPP_DL_WARNING, |
1518 | "character constant too long for its type"); | |
ebc03810 | 1519 | } |
1520 | else if (i > 1 && CPP_OPTION (pfile, warn_multichar)) | |
3a79f5da | 1521 | cpp_warning (pfile, CPP_W_MULTICHAR, "multi-character character constant"); |
ebc03810 | 1522 | |
1523 | /* Multichar constants are of type int and therefore signed. */ | |
1524 | if (i > 1) | |
1525 | unsigned_p = 0; | |
1526 | else | |
1527 | unsigned_p = CPP_OPTION (pfile, unsigned_char); | |
1528 | ||
1529 | /* Truncate the constant to its natural width, and simultaneously | |
1530 | sign- or zero-extend to the full width of cppchar_t. | |
1531 | For single-character constants, the value is WIDTH bits wide. | |
1532 | For multi-character constants, the value is INT_PRECISION bits wide. */ | |
1533 | if (i > 1) | |
1534 | width = CPP_OPTION (pfile, int_precision); | |
1535 | if (width < BITS_PER_CPPCHAR_T) | |
1536 | { | |
1537 | mask = ((cppchar_t) 1 << width) - 1; | |
1538 | if (unsigned_p || !(result & (1 << (width - 1)))) | |
1539 | result &= mask; | |
1540 | else | |
1541 | result |= ~mask; | |
1542 | } | |
1543 | *pchars_seen = i; | |
1544 | *unsignedp = unsigned_p; | |
1545 | return result; | |
1546 | } | |
787c3d1a | 1547 | |
ebc03810 | 1548 | /* Subroutine of cpp_interpret_charconst which performs the conversion |
1549 | to a number, for wide strings. STR is the string structure returned | |
1550 | by cpp_interpret_string. PCHARS_SEEN and UNSIGNEDP are as for | |
924bbf02 | 1551 | cpp_interpret_charconst. TYPE is the token type. */ |
ebc03810 | 1552 | static cppchar_t |
1553 | wide_str_to_charconst (cpp_reader *pfile, cpp_string str, | |
924bbf02 | 1554 | unsigned int *pchars_seen, int *unsignedp, |
1555 | enum cpp_ttype type) | |
ebc03810 | 1556 | { |
1557 | bool bigend = CPP_OPTION (pfile, bytes_big_endian); | |
924bbf02 | 1558 | size_t width = converter_for_type (pfile, type).width; |
ebc03810 | 1559 | size_t cwidth = CPP_OPTION (pfile, char_precision); |
1560 | size_t mask = width_to_mask (width); | |
1561 | size_t cmask = width_to_mask (cwidth); | |
1562 | size_t nbwc = width / cwidth; | |
1563 | size_t off, i; | |
1564 | cppchar_t result = 0, c; | |
1565 | ||
1566 | /* This is finicky because the string is in the target's byte order, | |
1567 | which may not be our byte order. Only the last character, ignoring | |
1568 | the NUL terminator, is relevant. */ | |
1569 | off = str.len - (nbwc * 2); | |
1570 | result = 0; | |
1571 | for (i = 0; i < nbwc; i++) | |
1572 | { | |
1573 | c = bigend ? str.text[off + i] : str.text[off + nbwc - i - 1]; | |
1574 | result = (result << cwidth) | (c & cmask); | |
1575 | } | |
1576 | ||
1577 | /* Wide character constants have type wchar_t, and a single | |
1578 | character exactly fills a wchar_t, so a multi-character wide | |
1579 | character constant is guaranteed to overflow. */ | |
924bbf02 | 1580 | if (str.len > nbwc * 2) |
d80d2074 | 1581 | cpp_error (pfile, CPP_DL_WARNING, |
1582 | "character constant too long for its type"); | |
ebc03810 | 1583 | |
1584 | /* Truncate the constant to its natural width, and simultaneously | |
1585 | sign- or zero-extend to the full width of cppchar_t. */ | |
1586 | if (width < BITS_PER_CPPCHAR_T) | |
1587 | { | |
924bbf02 | 1588 | if (type == CPP_CHAR16 || type == CPP_CHAR32 |
1589 | || CPP_OPTION (pfile, unsigned_wchar) | |
1590 | || !(result & (1 << (width - 1)))) | |
ebc03810 | 1591 | result &= mask; |
1592 | else | |
1593 | result |= ~mask; | |
1594 | } | |
1595 | ||
924bbf02 | 1596 | if (type == CPP_CHAR16 || type == CPP_CHAR32 |
1597 | || CPP_OPTION (pfile, unsigned_wchar)) | |
1598 | *unsignedp = 1; | |
1599 | else | |
1600 | *unsignedp = 0; | |
1601 | ||
ebc03810 | 1602 | *pchars_seen = 1; |
1603 | return result; | |
1604 | } | |
1605 | ||
1606 | /* Interpret a (possibly wide) character constant in TOKEN. | |
1607 | PCHARS_SEEN points to a variable that is filled in with the number | |
1608 | of characters seen, and UNSIGNEDP to a variable that indicates | |
1609 | whether the result has signed type. */ | |
1610 | cppchar_t | |
1611 | cpp_interpret_charconst (cpp_reader *pfile, const cpp_token *token, | |
1612 | unsigned int *pchars_seen, int *unsignedp) | |
1613 | { | |
1614 | cpp_string str = { 0, 0 }; | |
30b1ba42 | 1615 | bool wide = (token->type != CPP_CHAR && token->type != CPP_UTF8CHAR); |
1616 | int u8 = 2 * int(token->type == CPP_UTF8CHAR); | |
ebc03810 | 1617 | cppchar_t result; |
1618 | ||
30b1ba42 | 1619 | /* An empty constant will appear as L'', u'', U'', u8'', or '' */ |
1620 | if (token->val.str.len == (size_t) (2 + wide + u8)) | |
ebc03810 | 1621 | { |
d80d2074 | 1622 | cpp_error (pfile, CPP_DL_ERROR, "empty character constant"); |
ebc03810 | 1623 | return 0; |
1624 | } | |
924bbf02 | 1625 | else if (!cpp_interpret_string (pfile, &token->val.str, 1, &str, token->type)) |
ebc03810 | 1626 | return 0; |
1627 | ||
1628 | if (wide) | |
924bbf02 | 1629 | result = wide_str_to_charconst (pfile, str, pchars_seen, unsignedp, |
1630 | token->type); | |
ebc03810 | 1631 | else |
1632 | result = narrow_str_to_charconst (pfile, str, pchars_seen, unsignedp); | |
1633 | ||
1634 | if (str.text != token->val.str.text) | |
1635 | free ((void *)str.text); | |
1636 | ||
1637 | return result; | |
2cbf1359 | 1638 | } |
bb1fa6bb | 1639 | \f |
1640 | /* Convert an identifier denoted by ID and LEN, which might contain | |
1641 | UCN escapes, to the source character set, either UTF-8 or | |
1642 | UTF-EBCDIC. Assumes that the identifier is actually a valid identifier. */ | |
1643 | cpp_hashnode * | |
1644 | _cpp_interpret_identifier (cpp_reader *pfile, const uchar *id, size_t len) | |
1645 | { | |
1646 | /* It turns out that a UCN escape always turns into fewer characters | |
1647 | than the escape itself, so we can allocate a temporary in advance. */ | |
720aca92 | 1648 | uchar * buf = (uchar *) alloca (len + 1); |
bb1fa6bb | 1649 | uchar * bufp = buf; |
1650 | size_t idp; | |
1651 | ||
1652 | for (idp = 0; idp < len; idp++) | |
1653 | if (id[idp] != '\\') | |
1654 | *bufp++ = id[idp]; | |
1655 | else | |
1656 | { | |
1657 | unsigned length = id[idp+1] == 'u' ? 4 : 8; | |
1658 | cppchar_t value = 0; | |
1659 | size_t bufleft = len - (bufp - buf); | |
1660 | int rval; | |
1661 | ||
1662 | idp += 2; | |
1663 | while (length && idp < len && ISXDIGIT (id[idp])) | |
1664 | { | |
1665 | value = (value << 4) + hex_value (id[idp]); | |
1666 | idp++; | |
1667 | length--; | |
1668 | } | |
1669 | idp--; | |
1670 | ||
1671 | /* Special case for EBCDIC: if the identifier contains | |
1672 | a '$' specified using a UCN, translate it to EBCDIC. */ | |
1673 | if (value == 0x24) | |
1674 | { | |
1675 | *bufp++ = '$'; | |
1676 | continue; | |
1677 | } | |
1678 | ||
1679 | rval = one_cppchar_to_utf8 (value, &bufp, &bufleft); | |
1680 | if (rval) | |
1681 | { | |
1682 | errno = rval; | |
1683 | cpp_errno (pfile, CPP_DL_ERROR, | |
1684 | "converting UCN to source character set"); | |
1685 | break; | |
1686 | } | |
1687 | } | |
787c3d1a | 1688 | |
bb1fa6bb | 1689 | return CPP_HASHNODE (ht_lookup (pfile->hash_table, |
1690 | buf, bufp - buf, HT_ALLOC)); | |
1691 | } | |
1692 | \f | |
0097f6a2 | 1693 | /* Convert an input buffer (containing the complete contents of one |
1694 | source file) from INPUT_CHARSET to the source character set. INPUT | |
1695 | points to the input buffer, SIZE is its allocated size, and LEN is | |
1696 | the length of the meaningful data within the buffer. The | |
d656d07a | 1697 | translated buffer is returned, *ST_SIZE is set to the length of |
1698 | the meaningful data within the translated buffer, and *BUFFER_START | |
1699 | is set to the start of the returned buffer. *BUFFER_START may | |
1700 | differ from the return value in the case of a BOM or other ignored | |
1701 | marker information. | |
1702 | ||
1703 | INPUT is expected to have been allocated with xmalloc. This | |
1704 | function will either set *BUFFER_START to INPUT, or free it and set | |
1705 | *BUFFER_START to a pointer to another xmalloc-allocated block of | |
1706 | memory. */ | |
0097f6a2 | 1707 | uchar * |
57ba96e9 | 1708 | _cpp_convert_input (cpp_reader *pfile, const char *input_charset, |
d656d07a | 1709 | uchar *input, size_t size, size_t len, |
1710 | const unsigned char **buffer_start, off_t *st_size) | |
787c3d1a | 1711 | { |
57ba96e9 | 1712 | struct cset_converter input_cset; |
1713 | struct _cpp_strbuf to; | |
d656d07a | 1714 | unsigned char *buffer; |
787c3d1a | 1715 | |
57ba96e9 | 1716 | input_cset = init_iconv_desc (pfile, SOURCE_CHARSET, input_charset); |
1717 | if (input_cset.func == convert_no_conversion) | |
1718 | { | |
1719 | to.text = input; | |
1720 | to.asize = size; | |
1721 | to.len = len; | |
1722 | } | |
1723 | else | |
1724 | { | |
1725 | to.asize = MAX (65536, len); | |
720aca92 | 1726 | to.text = XNEWVEC (uchar, to.asize); |
57ba96e9 | 1727 | to.len = 0; |
787c3d1a | 1728 | |
57ba96e9 | 1729 | if (!APPLY_CONVERSION (input_cset, input, len, &to)) |
1730 | cpp_error (pfile, CPP_DL_ERROR, | |
1731 | "failure to convert %s to %s", | |
1732 | CPP_OPTION (pfile, input_charset), SOURCE_CHARSET); | |
787c3d1a | 1733 | |
57ba96e9 | 1734 | free (input); |
1735 | } | |
787c3d1a | 1736 | |
57ba96e9 | 1737 | /* Clean up the mess. */ |
1738 | if (input_cset.func == convert_using_iconv) | |
1739 | iconv_close (input_cset.cd); | |
787c3d1a | 1740 | |
57ba96e9 | 1741 | /* Resize buffer if we allocated substantially too much, or if we |
8e1d1b0c | 1742 | haven't enough space for the \n-terminator or following |
1743 | 15 bytes of padding (used to quiet warnings from valgrind or | |
1744 | Address Sanitizer, when the optimized lexer accesses aligned | |
1745 | 16-byte memory chunks, including the bytes after the malloced, | |
1746 | area, and stops lexing on '\n'). */ | |
1747 | if (to.len + 4096 < to.asize || to.len + 16 > to.asize) | |
1748 | to.text = XRESIZEVEC (uchar, to.text, to.len + 16); | |
1749 | ||
1750 | memset (to.text + to.len, '\0', 16); | |
787c3d1a | 1751 | |
f86986bc | 1752 | /* If the file is using old-school Mac line endings (\r only), |
1753 | terminate with another \r, not an \n, so that we do not mistake | |
1754 | the \r\n sequence for a single DOS line ending and erroneously | |
1755 | issue the "No newline at end of file" diagnostic. */ | |
854f075e | 1756 | if (to.len && to.text[to.len - 1] == '\r') |
f86986bc | 1757 | to.text[to.len] = '\r'; |
1758 | else | |
1759 | to.text[to.len] = '\n'; | |
1760 | ||
d656d07a | 1761 | buffer = to.text; |
57ba96e9 | 1762 | *st_size = to.len; |
d656d07a | 1763 | #if HOST_CHARSET == HOST_CHARSET_ASCII |
1764 | /* The HOST_CHARSET test just above ensures that the source charset | |
1765 | is UTF-8. So, ignore a UTF-8 BOM if we see one. Note that | |
1766 | glib'c UTF-8 iconv() provider (as of glibc 2.7) does not ignore a | |
1767 | BOM -- however, even if it did, we would still need this code due | |
1768 | to the 'convert_no_conversion' case. */ | |
1769 | if (to.len >= 3 && to.text[0] == 0xef && to.text[1] == 0xbb | |
1770 | && to.text[2] == 0xbf) | |
1771 | { | |
1772 | *st_size -= 3; | |
1773 | buffer += 3; | |
1774 | } | |
1775 | #endif | |
1776 | ||
1777 | *buffer_start = to.text; | |
1778 | return buffer; | |
787c3d1a | 1779 | } |
1780 | ||
0097f6a2 | 1781 | /* Decide on the default encoding to assume for input files. */ |
57ba96e9 | 1782 | const char * |
1783 | _cpp_default_encoding (void) | |
787c3d1a | 1784 | { |
57ba96e9 | 1785 | const char *current_encoding = NULL; |
1786 | ||
d856c8a6 | 1787 | /* We disable this because the default codeset is 7-bit ASCII on |
1788 | most platforms, and this causes conversion failures on every | |
1789 | file in GCC that happens to have one of the upper 128 characters | |
1790 | in it -- most likely, as part of the name of a contributor. | |
1791 | We should definitely recognize in-band markers of file encoding, | |
1792 | like: | |
1793 | - the appropriate Unicode byte-order mark (FE FF) to recognize | |
1794 | UTF16 and UCS4 (in both big-endian and little-endian flavors) | |
1795 | and UTF8 | |
3eb3f293 | 1796 | - a "#i", "#d", "/ *", "//", " #p" or "#p" (for #pragma) to |
d856c8a6 | 1797 | distinguish ASCII and EBCDIC. |
1798 | - now we can parse something like "#pragma GCC encoding <xyz> | |
1799 | on the first line, or even Emacs/VIM's mode line tags (there's | |
1800 | a problem here in that VIM uses the last line, and Emacs has | |
0097f6a2 | 1801 | its more elaborate "local variables" convention). |
d856c8a6 | 1802 | - investigate whether Java has another common convention, which |
1803 | would be friendly to support. | |
1804 | (Zack Weinberg and Paolo Bonzini, May 20th 2004) */ | |
1805 | #if defined (HAVE_LOCALE_H) && defined (HAVE_LANGINFO_CODESET) && 0 | |
57ba96e9 | 1806 | setlocale (LC_CTYPE, ""); |
1807 | current_encoding = nl_langinfo (CODESET); | |
1808 | #endif | |
1809 | if (current_encoding == NULL || *current_encoding == '\0') | |
1810 | current_encoding = SOURCE_CHARSET; | |
1811 | ||
1812 | return current_encoding; | |
787c3d1a | 1813 | } |