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2cbf1359 | 1 | /* CPP Library - charsets |
fbd26352 | 2 | Copyright (C) 1998-2019 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 | |
d4166bdc | 815 | /* cpp_substring_ranges's constructor. */ |
816 | ||
817 | cpp_substring_ranges::cpp_substring_ranges () : | |
818 | m_ranges (NULL), | |
819 | m_num_ranges (0), | |
820 | m_alloc_ranges (8) | |
821 | { | |
822 | m_ranges = XNEWVEC (source_range, m_alloc_ranges); | |
823 | } | |
824 | ||
825 | /* cpp_substring_ranges's destructor. */ | |
826 | ||
827 | cpp_substring_ranges::~cpp_substring_ranges () | |
828 | { | |
829 | free (m_ranges); | |
830 | } | |
831 | ||
832 | /* Add RANGE to the vector of source_range information. */ | |
833 | ||
834 | void | |
835 | cpp_substring_ranges::add_range (source_range range) | |
836 | { | |
837 | if (m_num_ranges >= m_alloc_ranges) | |
838 | { | |
839 | m_alloc_ranges *= 2; | |
840 | m_ranges | |
841 | = (source_range *)xrealloc (m_ranges, | |
842 | sizeof (source_range) * m_alloc_ranges); | |
843 | } | |
844 | m_ranges[m_num_ranges++] = range; | |
845 | } | |
846 | ||
847 | /* Read NUM ranges from LOC_READER, adding them to the vector of source_range | |
848 | information. */ | |
849 | ||
850 | void | |
851 | cpp_substring_ranges::add_n_ranges (int num, | |
852 | cpp_string_location_reader &loc_reader) | |
853 | { | |
854 | for (int i = 0; i < num; i++) | |
855 | add_range (loc_reader.get_next ()); | |
856 | } | |
857 | ||
858 | \f | |
859 | ||
ebc03810 | 860 | /* Utility routine that computes a mask of the form 0000...111... with |
861 | WIDTH 1-bits. */ | |
862 | static inline size_t | |
863 | width_to_mask (size_t width) | |
864 | { | |
865 | width = MIN (width, BITS_PER_CPPCHAR_T); | |
866 | if (width >= CHAR_BIT * sizeof (size_t)) | |
867 | return ~(size_t) 0; | |
868 | else | |
869 | return ((size_t) 1 << width) - 1; | |
870 | } | |
871 | ||
bce47149 | 872 | /* A large table of unicode character information. */ |
873 | enum { | |
874 | /* Valid in a C99 identifier? */ | |
875 | C99 = 1, | |
876 | /* Valid in a C99 identifier, but not as the first character? */ | |
460f52aa | 877 | N99 = 2, |
bce47149 | 878 | /* Valid in a C++ identifier? */ |
879 | CXX = 4, | |
460f52aa | 880 | /* Valid in a C11/C++11 identifier? */ |
881 | C11 = 8, | |
882 | /* Valid in a C11/C++11 identifier, but not as the first character? */ | |
883 | N11 = 16, | |
bce47149 | 884 | /* NFC representation is not valid in an identifier? */ |
460f52aa | 885 | CID = 32, |
bce47149 | 886 | /* Might be valid NFC form? */ |
460f52aa | 887 | NFC = 64, |
bce47149 | 888 | /* Might be valid NFKC form? */ |
460f52aa | 889 | NKC = 128, |
bce47149 | 890 | /* Certain preceding characters might make it not valid NFC/NKFC form? */ |
460f52aa | 891 | CTX = 256 |
bce47149 | 892 | }; |
893 | ||
460f52aa | 894 | struct ucnrange { |
bce47149 | 895 | /* Bitmap of flags above. */ |
460f52aa | 896 | unsigned short flags; |
bce47149 | 897 | /* Combining class of the character. */ |
898 | unsigned char combine; | |
899 | /* Last character in the range described by this entry. */ | |
460f52aa | 900 | unsigned int end; |
bce47149 | 901 | }; |
460f52aa | 902 | #include "ucnid.h" |
bce47149 | 903 | |
ebc03810 | 904 | /* Returns 1 if C is valid in an identifier, 2 if C is valid except at |
905 | the start of an identifier, and 0 if C is not valid in an | |
906 | identifier. We assume C has already gone through the checks of | |
bce47149 | 907 | _cpp_valid_ucn. Also update NST for C if returning nonzero. The |
908 | algorithm is a simple binary search on the table defined in | |
909 | ucnid.h. */ | |
ebc03810 | 910 | |
911 | static int | |
bce47149 | 912 | ucn_valid_in_identifier (cpp_reader *pfile, cppchar_t c, |
913 | struct normalize_state *nst) | |
ebc03810 | 914 | { |
915 | int mn, mx, md; | |
460f52aa | 916 | unsigned short valid_flags, invalid_start_flags; |
ebc03810 | 917 | |
460f52aa | 918 | if (c > 0x10FFFF) |
bce47149 | 919 | return 0; |
920 | ||
921 | mn = 0; | |
922 | mx = ARRAY_SIZE (ucnranges) - 1; | |
923 | while (mx != mn) | |
ebc03810 | 924 | { |
925 | md = (mn + mx) / 2; | |
bce47149 | 926 | if (c <= ucnranges[md].end) |
ebc03810 | 927 | mx = md; |
ebc03810 | 928 | else |
bce47149 | 929 | mn = md + 1; |
ebc03810 | 930 | } |
2cbf1359 | 931 | |
ebc03810 | 932 | /* When -pedantic, we require the character to have been listed by |
933 | the standard for the current language. Otherwise, we accept the | |
460f52aa | 934 | union of the acceptable sets for all supported language versions. */ |
935 | valid_flags = C99 | CXX | C11; | |
936 | if (CPP_PEDANTIC (pfile)) | |
937 | { | |
938 | if (CPP_OPTION (pfile, c11_identifiers)) | |
939 | valid_flags = C11; | |
940 | else if (CPP_OPTION (pfile, c99)) | |
941 | valid_flags = C99; | |
942 | else if (CPP_OPTION (pfile, cplusplus)) | |
943 | valid_flags = CXX; | |
944 | } | |
945 | if (! (ucnranges[mn].flags & valid_flags)) | |
bce47149 | 946 | return 0; |
460f52aa | 947 | if (CPP_OPTION (pfile, c11_identifiers)) |
948 | invalid_start_flags = N11; | |
949 | else if (CPP_OPTION (pfile, c99)) | |
950 | invalid_start_flags = N99; | |
951 | else | |
952 | invalid_start_flags = 0; | |
ebc03810 | 953 | |
bce47149 | 954 | /* Update NST. */ |
955 | if (ucnranges[mn].combine != 0 && ucnranges[mn].combine < nst->prev_class) | |
956 | nst->level = normalized_none; | |
957 | else if (ucnranges[mn].flags & CTX) | |
958 | { | |
959 | bool safe; | |
960 | cppchar_t p = nst->previous; | |
961 | ||
bce47149 | 962 | /* For Hangul, characters in the range AC00-D7A3 are NFC/NFKC, |
963 | and are combined algorithmically from a sequence of the form | |
964 | 1100-1112 1161-1175 11A8-11C2 | |
965 | (if the third is not present, it is treated as 11A7, which is not | |
966 | really a valid character). | |
967 | Unfortunately, C99 allows (only) the NFC form, but C++ allows | |
968 | only the combining characters. */ | |
460f52aa | 969 | if (c >= 0x1161 && c <= 0x1175) |
bce47149 | 970 | safe = p < 0x1100 || p > 0x1112; |
971 | else if (c >= 0x11A8 && c <= 0x11C2) | |
972 | safe = (p < 0xAC00 || p > 0xD7A3 || (p - 0xAC00) % 28 != 0); | |
973 | else | |
460f52aa | 974 | safe = check_nfc (pfile, c, p); |
975 | if (!safe) | |
bce47149 | 976 | { |
460f52aa | 977 | if ((c >= 0x1161 && c <= 0x1175) || (c >= 0x11A8 && c <= 0x11C2)) |
978 | nst->level = MAX (nst->level, normalized_identifier_C); | |
979 | else | |
980 | nst->level = normalized_none; | |
bce47149 | 981 | } |
bce47149 | 982 | } |
983 | else if (ucnranges[mn].flags & NKC) | |
984 | ; | |
985 | else if (ucnranges[mn].flags & NFC) | |
986 | nst->level = MAX (nst->level, normalized_C); | |
987 | else if (ucnranges[mn].flags & CID) | |
988 | nst->level = MAX (nst->level, normalized_identifier_C); | |
989 | else | |
990 | nst->level = normalized_none; | |
460f52aa | 991 | if (ucnranges[mn].combine == 0) |
992 | nst->previous = c; | |
bce47149 | 993 | nst->prev_class = ucnranges[mn].combine; |
994 | ||
460f52aa | 995 | /* In C99, UCN digits may not begin identifiers. In C11 and C++11, |
996 | UCN combining characters may not begin identifiers. */ | |
997 | if (ucnranges[mn].flags & invalid_start_flags) | |
ebc03810 | 998 | return 2; |
999 | ||
1000 | return 1; | |
1001 | } | |
2cbf1359 | 1002 | |
1003 | /* [lex.charset]: The character designated by the universal character | |
1004 | name \UNNNNNNNN is that character whose character short name in | |
1005 | ISO/IEC 10646 is NNNNNNNN; the character designated by the | |
1006 | universal character name \uNNNN is that character whose character | |
1007 | short name in ISO/IEC 10646 is 0000NNNN. If the hexadecimal value | |
8e83a065 | 1008 | for a universal character name corresponds to a surrogate code point |
1009 | (in the range 0xD800-0xDFFF, inclusive), the program is ill-formed. | |
1010 | Additionally, if the hexadecimal value for a universal-character-name | |
1011 | outside a character or string literal corresponds to a control character | |
1012 | (in either of the ranges 0x00-0x1F or 0x7F-0x9F, both inclusive) or to a | |
1013 | character in the basic source character set, the program is ill-formed. | |
1014 | ||
1015 | C99 6.4.3: A universal character name shall not specify a character | |
1016 | whose short identifier is less than 00A0 other than 0024 ($), 0040 (@), | |
1017 | or 0060 (`), nor one in the range D800 through DFFF inclusive. | |
2cbf1359 | 1018 | |
1019 | *PSTR must be preceded by "\u" or "\U"; it is assumed that the | |
880e4baa | 1020 | buffer end is delimited by a non-hex digit. Returns false if the |
1021 | UCN has not been consumed, true otherwise. | |
2cbf1359 | 1022 | |
880e4baa | 1023 | The value of the UCN, whether valid or invalid, is returned in *CP. |
1024 | Diagnostics are emitted for invalid values. PSTR is updated to point | |
1025 | one beyond the UCN, or to the syntactically invalid character. | |
2cbf1359 | 1026 | |
1027 | IDENTIFIER_POS is 0 when not in an identifier, 1 for the start of | |
d4166bdc | 1028 | an identifier, or 2 otherwise. |
1029 | ||
67376ed1 | 1030 | If LOC_READER is non-NULL, then position information is |
d4166bdc | 1031 | read from *LOC_READER and CHAR_RANGE->m_finish is updated accordingly. */ |
2cbf1359 | 1032 | |
880e4baa | 1033 | bool |
ebc03810 | 1034 | _cpp_valid_ucn (cpp_reader *pfile, const uchar **pstr, |
bce47149 | 1035 | const uchar *limit, int identifier_pos, |
d4166bdc | 1036 | struct normalize_state *nst, cppchar_t *cp, |
1037 | source_range *char_range, | |
1038 | cpp_string_location_reader *loc_reader) | |
2cbf1359 | 1039 | { |
1040 | cppchar_t result, c; | |
1041 | unsigned int length; | |
1042 | const uchar *str = *pstr; | |
1043 | const uchar *base = str - 2; | |
1044 | ||
2cbf1359 | 1045 | if (!CPP_OPTION (pfile, cplusplus) && !CPP_OPTION (pfile, c99)) |
d80d2074 | 1046 | cpp_error (pfile, CPP_DL_WARNING, |
ebc03810 | 1047 | "universal character names are only valid in C++ and C99"); |
806fe15e | 1048 | else if (CPP_OPTION (pfile, cpp_warn_c90_c99_compat) > 0 |
890c2e2f | 1049 | && !CPP_OPTION (pfile, cplusplus)) |
1050 | cpp_error (pfile, CPP_DL_WARNING, | |
1051 | "C99's universal character names are incompatible with C90"); | |
ebc03810 | 1052 | else if (CPP_WTRADITIONAL (pfile) && identifier_pos == 0) |
3a79f5da | 1053 | cpp_warning (pfile, CPP_W_TRADITIONAL, |
1054 | "the meaning of '\\%c' is different in traditional C", | |
1055 | (int) str[-1]); | |
2cbf1359 | 1056 | |
1057 | if (str[-1] == 'u') | |
1058 | length = 4; | |
1059 | else if (str[-1] == 'U') | |
1060 | length = 8; | |
1061 | else | |
bce47149 | 1062 | { |
1063 | cpp_error (pfile, CPP_DL_ICE, "In _cpp_valid_ucn but not a UCN"); | |
1064 | length = 4; | |
1065 | } | |
2cbf1359 | 1066 | |
1067 | result = 0; | |
1068 | do | |
1069 | { | |
1070 | c = *str; | |
1071 | if (!ISXDIGIT (c)) | |
1072 | break; | |
1073 | str++; | |
d4166bdc | 1074 | if (loc_reader) |
67376ed1 | 1075 | { |
1076 | gcc_assert (char_range); | |
1077 | char_range->m_finish = loc_reader->get_next ().m_finish; | |
1078 | } | |
2cbf1359 | 1079 | result = (result << 4) + hex_value (c); |
1080 | } | |
ebc03810 | 1081 | while (--length && str < limit); |
2cbf1359 | 1082 | |
bc65f24f | 1083 | /* Partial UCNs are not valid in strings, but decompose into |
1084 | multiple tokens in identifiers, so we can't give a helpful | |
1085 | error message in that case. */ | |
1086 | if (length && identifier_pos) | |
880e4baa | 1087 | { |
1088 | *cp = 0; | |
1089 | return false; | |
1090 | } | |
1091 | ||
2cbf1359 | 1092 | *pstr = str; |
1093 | if (length) | |
ebc03810 | 1094 | { |
d80d2074 | 1095 | cpp_error (pfile, CPP_DL_ERROR, |
1096 | "incomplete universal character name %.*s", | |
ebc03810 | 1097 | (int) (str - base), base); |
1098 | result = 1; | |
1099 | } | |
8e83a065 | 1100 | /* The C99 standard permits $, @ and ` to be specified as UCNs. We use |
1101 | hex escapes so that this also works with EBCDIC hosts. | |
1102 | C++0x permits everything below 0xa0 within literals; | |
1103 | ucn_valid_in_identifier will complain about identifiers. */ | |
2cbf1359 | 1104 | else if ((result < 0xa0 |
8e83a065 | 1105 | && !CPP_OPTION (pfile, cplusplus) |
2cbf1359 | 1106 | && (result != 0x24 && result != 0x40 && result != 0x60)) |
1107 | || (result & 0x80000000) | |
1108 | || (result >= 0xD800 && result <= 0xDFFF)) | |
1109 | { | |
d80d2074 | 1110 | cpp_error (pfile, CPP_DL_ERROR, |
1111 | "%.*s is not a valid universal character", | |
7d3b0527 | 1112 | (int) (str - base), base); |
ebc03810 | 1113 | result = 1; |
2cbf1359 | 1114 | } |
bb1fa6bb | 1115 | else if (identifier_pos && result == 0x24 |
1116 | && CPP_OPTION (pfile, dollars_in_ident)) | |
1117 | { | |
1118 | if (CPP_OPTION (pfile, warn_dollars) && !pfile->state.skipping) | |
1119 | { | |
1120 | CPP_OPTION (pfile, warn_dollars) = 0; | |
1121 | cpp_error (pfile, CPP_DL_PEDWARN, "'$' in identifier or number"); | |
1122 | } | |
460f52aa | 1123 | NORMALIZE_STATE_UPDATE_IDNUM (nst, result); |
bb1fa6bb | 1124 | } |
2cbf1359 | 1125 | else if (identifier_pos) |
1126 | { | |
bce47149 | 1127 | int validity = ucn_valid_in_identifier (pfile, result, nst); |
2cbf1359 | 1128 | |
1129 | if (validity == 0) | |
d80d2074 | 1130 | cpp_error (pfile, CPP_DL_ERROR, |
2cbf1359 | 1131 | "universal character %.*s is not valid in an identifier", |
7d3b0527 | 1132 | (int) (str - base), base); |
2cbf1359 | 1133 | else if (validity == 2 && identifier_pos == 1) |
d80d2074 | 1134 | cpp_error (pfile, CPP_DL_ERROR, |
2cbf1359 | 1135 | "universal character %.*s is not valid at the start of an identifier", |
7d3b0527 | 1136 | (int) (str - base), base); |
2cbf1359 | 1137 | } |
1138 | ||
880e4baa | 1139 | *cp = result; |
1140 | return true; | |
2cbf1359 | 1141 | } |
1142 | ||
ebc03810 | 1143 | /* Convert an UCN, pointed to by FROM, to UTF-8 encoding, then translate |
d4166bdc | 1144 | it to the execution character set and write the result into TBUF, |
1145 | if TBUF is non-NULL. | |
1146 | An advanced pointer is returned. Issues all relevant diagnostics. | |
1147 | If LOC_READER is non-NULL, then RANGES must be non-NULL and CHAR_RANGE | |
1148 | contains the location of the character so far: location information | |
1149 | is read from *LOC_READER, and *RANGES is updated accordingly. */ | |
ebc03810 | 1150 | static const uchar * |
1151 | convert_ucn (cpp_reader *pfile, const uchar *from, const uchar *limit, | |
d4166bdc | 1152 | struct _cpp_strbuf *tbuf, struct cset_converter cvt, |
1153 | source_range char_range, | |
1154 | cpp_string_location_reader *loc_reader, | |
1155 | cpp_substring_ranges *ranges) | |
2cbf1359 | 1156 | { |
ebc03810 | 1157 | cppchar_t ucn; |
9a432f9a | 1158 | uchar buf[6]; |
1159 | uchar *bufp = buf; | |
1160 | size_t bytesleft = 6; | |
1161 | int rval; | |
bce47149 | 1162 | struct normalize_state nst = INITIAL_NORMALIZE_STATE; |
9a432f9a | 1163 | |
d4166bdc | 1164 | /* loc_reader and ranges must either be both NULL, or both be non-NULL. */ |
1165 | gcc_assert ((loc_reader != NULL) == (ranges != NULL)); | |
1166 | ||
21dda4ee | 1167 | from++; /* Skip u/U. */ |
d4166bdc | 1168 | |
1169 | if (loc_reader) | |
1170 | /* The u/U is part of the spelling of this character. */ | |
1171 | char_range.m_finish = loc_reader->get_next ().m_finish; | |
1172 | ||
1173 | _cpp_valid_ucn (pfile, &from, limit, 0, &nst, | |
1174 | &ucn, &char_range, loc_reader); | |
ebc03810 | 1175 | |
9a432f9a | 1176 | rval = one_cppchar_to_utf8 (ucn, &bufp, &bytesleft); |
1177 | if (rval) | |
ebc03810 | 1178 | { |
9a432f9a | 1179 | errno = rval; |
d80d2074 | 1180 | cpp_errno (pfile, CPP_DL_ERROR, |
1181 | "converting UCN to source character set"); | |
ebc03810 | 1182 | } |
d4166bdc | 1183 | else |
1184 | { | |
1185 | if (tbuf) | |
1186 | if (!APPLY_CONVERSION (cvt, buf, 6 - bytesleft, tbuf)) | |
1187 | cpp_errno (pfile, CPP_DL_ERROR, | |
1188 | "converting UCN to execution character set"); | |
1189 | ||
1190 | if (loc_reader) | |
1191 | { | |
1192 | int num_encoded_bytes = 6 - bytesleft; | |
1193 | for (int i = 0; i < num_encoded_bytes; i++) | |
1194 | ranges->add_range (char_range); | |
1195 | } | |
1196 | } | |
ebc03810 | 1197 | |
1198 | return from; | |
1199 | } | |
2cbf1359 | 1200 | |
0097f6a2 | 1201 | /* Subroutine of convert_hex and convert_oct. N is the representation |
1202 | in the execution character set of a numeric escape; write it into the | |
1203 | string buffer TBUF and update the end-of-string pointer therein. WIDE | |
1204 | is true if it's a wide string that's being assembled in TBUF. This | |
1205 | function issues no diagnostics and never fails. */ | |
ebc03810 | 1206 | static void |
1207 | emit_numeric_escape (cpp_reader *pfile, cppchar_t n, | |
924bbf02 | 1208 | struct _cpp_strbuf *tbuf, struct cset_converter cvt) |
ebc03810 | 1209 | { |
924bbf02 | 1210 | size_t width = cvt.width; |
1211 | ||
1212 | if (width != CPP_OPTION (pfile, char_precision)) | |
2cbf1359 | 1213 | { |
ebc03810 | 1214 | /* We have to render this into the target byte order, which may not |
1215 | be our byte order. */ | |
1216 | bool bigend = CPP_OPTION (pfile, bytes_big_endian); | |
ebc03810 | 1217 | size_t cwidth = CPP_OPTION (pfile, char_precision); |
1218 | size_t cmask = width_to_mask (cwidth); | |
1219 | size_t nbwc = width / cwidth; | |
1220 | size_t i; | |
1221 | size_t off = tbuf->len; | |
1222 | cppchar_t c; | |
1223 | ||
1224 | if (tbuf->len + nbwc > tbuf->asize) | |
1225 | { | |
1226 | tbuf->asize += OUTBUF_BLOCK_SIZE; | |
720aca92 | 1227 | tbuf->text = XRESIZEVEC (uchar, tbuf->text, tbuf->asize); |
ebc03810 | 1228 | } |
1229 | ||
1230 | for (i = 0; i < nbwc; i++) | |
1231 | { | |
1232 | c = n & cmask; | |
1233 | n >>= cwidth; | |
1234 | tbuf->text[off + (bigend ? nbwc - i - 1 : i)] = c; | |
1235 | } | |
1236 | tbuf->len += nbwc; | |
2cbf1359 | 1237 | } |
ebc03810 | 1238 | else |
2cbf1359 | 1239 | { |
0097f6a2 | 1240 | /* Note: this code does not handle the case where the target |
1241 | and host have a different number of bits in a byte. */ | |
ebc03810 | 1242 | if (tbuf->len + 1 > tbuf->asize) |
1243 | { | |
1244 | tbuf->asize += OUTBUF_BLOCK_SIZE; | |
720aca92 | 1245 | tbuf->text = XRESIZEVEC (uchar, tbuf->text, tbuf->asize); |
ebc03810 | 1246 | } |
1247 | tbuf->text[tbuf->len++] = n; | |
2cbf1359 | 1248 | } |
ebc03810 | 1249 | } |
2cbf1359 | 1250 | |
ebc03810 | 1251 | /* Convert a hexadecimal escape, pointed to by FROM, to the execution |
d4166bdc | 1252 | character set and write it into the string buffer TBUF (if non-NULL). |
1253 | Returns an advanced pointer, and issues diagnostics as necessary. | |
ebc03810 | 1254 | No character set translation occurs; this routine always produces the |
1255 | execution-set character with numeric value equal to the given hex | |
d4166bdc | 1256 | number. You can, e.g. generate surrogate pairs this way. |
1257 | If LOC_READER is non-NULL, then RANGES must be non-NULL and CHAR_RANGE | |
1258 | contains the location of the character so far: location information | |
1259 | is read from *LOC_READER, and *RANGES is updated accordingly. */ | |
ebc03810 | 1260 | static const uchar * |
1261 | convert_hex (cpp_reader *pfile, const uchar *from, const uchar *limit, | |
d4166bdc | 1262 | struct _cpp_strbuf *tbuf, struct cset_converter cvt, |
1263 | source_range char_range, | |
1264 | cpp_string_location_reader *loc_reader, | |
1265 | cpp_substring_ranges *ranges) | |
ebc03810 | 1266 | { |
1267 | cppchar_t c, n = 0, overflow = 0; | |
1268 | int digits_found = 0; | |
924bbf02 | 1269 | size_t width = cvt.width; |
ebc03810 | 1270 | size_t mask = width_to_mask (width); |
1271 | ||
d4166bdc | 1272 | /* loc_reader and ranges must either be both NULL, or both be non-NULL. */ |
1273 | gcc_assert ((loc_reader != NULL) == (ranges != NULL)); | |
1274 | ||
ebc03810 | 1275 | if (CPP_WTRADITIONAL (pfile)) |
3a79f5da | 1276 | cpp_warning (pfile, CPP_W_TRADITIONAL, |
1277 | "the meaning of '\\x' is different in traditional C"); | |
ebc03810 | 1278 | |
d4166bdc | 1279 | /* Skip 'x'. */ |
1280 | from++; | |
1281 | ||
1282 | /* The 'x' is part of the spelling of this character. */ | |
1283 | if (loc_reader) | |
1284 | char_range.m_finish = loc_reader->get_next ().m_finish; | |
1285 | ||
ebc03810 | 1286 | while (from < limit) |
1287 | { | |
1288 | c = *from; | |
1289 | if (! hex_p (c)) | |
1290 | break; | |
1291 | from++; | |
d4166bdc | 1292 | if (loc_reader) |
1293 | char_range.m_finish = loc_reader->get_next ().m_finish; | |
ebc03810 | 1294 | overflow |= n ^ (n << 4 >> 4); |
1295 | n = (n << 4) + hex_value (c); | |
1296 | digits_found = 1; | |
1297 | } | |
2cbf1359 | 1298 | |
ebc03810 | 1299 | if (!digits_found) |
1300 | { | |
d80d2074 | 1301 | cpp_error (pfile, CPP_DL_ERROR, |
ebc03810 | 1302 | "\\x used with no following hex digits"); |
1303 | return from; | |
1304 | } | |
1305 | ||
1306 | if (overflow | (n != (n & mask))) | |
1307 | { | |
d80d2074 | 1308 | cpp_error (pfile, CPP_DL_PEDWARN, |
ebc03810 | 1309 | "hex escape sequence out of range"); |
1310 | n &= mask; | |
1311 | } | |
1312 | ||
d4166bdc | 1313 | if (tbuf) |
1314 | emit_numeric_escape (pfile, n, tbuf, cvt); | |
1315 | if (ranges) | |
1316 | ranges->add_range (char_range); | |
ebc03810 | 1317 | |
1318 | return from; | |
1319 | } | |
1320 | ||
1321 | /* Convert an octal escape, pointed to by FROM, to the execution | |
1322 | character set and write it into the string buffer TBUF. Returns an | |
1323 | advanced pointer, and issues diagnostics as necessary. | |
1324 | No character set translation occurs; this routine always produces the | |
1325 | execution-set character with numeric value equal to the given octal | |
d4166bdc | 1326 | number. |
1327 | If LOC_READER is non-NULL, then RANGES must be non-NULL and CHAR_RANGE | |
1328 | contains the location of the character so far: location information | |
1329 | is read from *LOC_READER, and *RANGES is updated accordingly. */ | |
ebc03810 | 1330 | static const uchar * |
1331 | convert_oct (cpp_reader *pfile, const uchar *from, const uchar *limit, | |
d4166bdc | 1332 | struct _cpp_strbuf *tbuf, struct cset_converter cvt, |
1333 | source_range char_range, | |
1334 | cpp_string_location_reader *loc_reader, | |
1335 | cpp_substring_ranges *ranges) | |
ebc03810 | 1336 | { |
1337 | size_t count = 0; | |
1338 | cppchar_t c, n = 0; | |
924bbf02 | 1339 | size_t width = cvt.width; |
ebc03810 | 1340 | size_t mask = width_to_mask (width); |
1341 | bool overflow = false; | |
1342 | ||
d4166bdc | 1343 | /* loc_reader and ranges must either be both NULL, or both be non-NULL. */ |
1344 | gcc_assert ((loc_reader != NULL) == (ranges != NULL)); | |
1345 | ||
ebc03810 | 1346 | while (from < limit && count++ < 3) |
1347 | { | |
1348 | c = *from; | |
1349 | if (c < '0' || c > '7') | |
1350 | break; | |
1351 | from++; | |
d4166bdc | 1352 | if (loc_reader) |
1353 | char_range.m_finish = loc_reader->get_next ().m_finish; | |
ebc03810 | 1354 | overflow |= n ^ (n << 3 >> 3); |
1355 | n = (n << 3) + c - '0'; | |
1356 | } | |
1357 | ||
1358 | if (n != (n & mask)) | |
1359 | { | |
d80d2074 | 1360 | cpp_error (pfile, CPP_DL_PEDWARN, |
ebc03810 | 1361 | "octal escape sequence out of range"); |
1362 | n &= mask; | |
1363 | } | |
1364 | ||
d4166bdc | 1365 | if (tbuf) |
1366 | emit_numeric_escape (pfile, n, tbuf, cvt); | |
1367 | if (ranges) | |
1368 | ranges->add_range (char_range); | |
ebc03810 | 1369 | |
1370 | return from; | |
1371 | } | |
1372 | ||
1373 | /* Convert an escape sequence (pointed to by FROM) to its value on | |
1374 | the target, and to the execution character set. Do not scan past | |
d4166bdc | 1375 | LIMIT. Write the converted value into TBUF, if TBUF is non-NULL. |
1376 | Returns an advanced pointer. Handles all relevant diagnostics. | |
1377 | If LOC_READER is non-NULL, then RANGES must be non-NULL: location | |
1378 | information is read from *LOC_READER, and *RANGES is updated | |
1379 | accordingly. */ | |
ebc03810 | 1380 | static const uchar * |
1381 | convert_escape (cpp_reader *pfile, const uchar *from, const uchar *limit, | |
d4166bdc | 1382 | struct _cpp_strbuf *tbuf, struct cset_converter cvt, |
1383 | cpp_string_location_reader *loc_reader, | |
1384 | cpp_substring_ranges *ranges) | |
ebc03810 | 1385 | { |
1386 | /* Values of \a \b \e \f \n \r \t \v respectively. */ | |
1387 | #if HOST_CHARSET == HOST_CHARSET_ASCII | |
1388 | static const uchar charconsts[] = { 7, 8, 27, 12, 10, 13, 9, 11 }; | |
1389 | #elif HOST_CHARSET == HOST_CHARSET_EBCDIC | |
1390 | static const uchar charconsts[] = { 47, 22, 39, 12, 21, 13, 5, 11 }; | |
1391 | #else | |
1392 | #error "unknown host character set" | |
1393 | #endif | |
1394 | ||
1395 | uchar c; | |
1396 | ||
d4166bdc | 1397 | /* Record the location of the backslash. */ |
1398 | source_range char_range; | |
1399 | if (loc_reader) | |
1400 | char_range = loc_reader->get_next (); | |
1401 | ||
ebc03810 | 1402 | c = *from; |
1403 | switch (c) | |
1404 | { | |
1405 | /* UCNs, hex escapes, and octal escapes are processed separately. */ | |
1406 | case 'u': case 'U': | |
d4166bdc | 1407 | return convert_ucn (pfile, from, limit, tbuf, cvt, |
1408 | char_range, loc_reader, ranges); | |
ebc03810 | 1409 | |
1410 | case 'x': | |
d4166bdc | 1411 | return convert_hex (pfile, from, limit, tbuf, cvt, |
1412 | char_range, loc_reader, ranges); | |
ebc03810 | 1413 | break; |
1414 | ||
1415 | case '0': case '1': case '2': case '3': | |
1416 | case '4': case '5': case '6': case '7': | |
d4166bdc | 1417 | return convert_oct (pfile, from, limit, tbuf, cvt, |
1418 | char_range, loc_reader, ranges); | |
ebc03810 | 1419 | |
1420 | /* Various letter escapes. Get the appropriate host-charset | |
1421 | value into C. */ | |
1422 | case '\\': case '\'': case '"': case '?': break; | |
1423 | ||
1424 | case '(': case '{': case '[': case '%': | |
1425 | /* '\(', etc, can be used at the beginning of a line in a long | |
1426 | string split onto multiple lines with \-newline, to prevent | |
1427 | Emacs or other text editors from getting confused. '\%' can | |
1428 | be used to prevent SCCS from mangling printf format strings. */ | |
1429 | if (CPP_PEDANTIC (pfile)) | |
1430 | goto unknown; | |
1431 | break; | |
1432 | ||
1433 | case 'b': c = charconsts[1]; break; | |
1434 | case 'f': c = charconsts[3]; break; | |
1435 | case 'n': c = charconsts[4]; break; | |
1436 | case 'r': c = charconsts[5]; break; | |
1437 | case 't': c = charconsts[6]; break; | |
1438 | case 'v': c = charconsts[7]; break; | |
1439 | ||
1440 | case 'a': | |
1441 | if (CPP_WTRADITIONAL (pfile)) | |
3a79f5da | 1442 | cpp_warning (pfile, CPP_W_TRADITIONAL, |
1443 | "the meaning of '\\a' is different in traditional C"); | |
ebc03810 | 1444 | c = charconsts[0]; |
1445 | break; | |
1446 | ||
1447 | case 'e': case 'E': | |
1448 | if (CPP_PEDANTIC (pfile)) | |
d80d2074 | 1449 | cpp_error (pfile, CPP_DL_PEDWARN, |
ebc03810 | 1450 | "non-ISO-standard escape sequence, '\\%c'", (int) c); |
1451 | c = charconsts[2]; | |
1452 | break; | |
1453 | ||
1454 | default: | |
1455 | unknown: | |
1456 | if (ISGRAPH (c)) | |
d80d2074 | 1457 | cpp_error (pfile, CPP_DL_PEDWARN, |
ed184982 | 1458 | "unknown escape sequence: '\\%c'", (int) c); |
ebc03810 | 1459 | else |
eb0d20b7 | 1460 | { |
1461 | /* diagnostic.c does not support "%03o". When it does, this | |
1462 | code can use %03o directly in the diagnostic again. */ | |
1463 | char buf[32]; | |
1464 | sprintf(buf, "%03o", (int) c); | |
1465 | cpp_error (pfile, CPP_DL_PEDWARN, | |
1466 | "unknown escape sequence: '\\%s'", buf); | |
1467 | } | |
ebc03810 | 1468 | } |
1469 | ||
d4166bdc | 1470 | if (tbuf) |
1471 | /* Now convert what we have to the execution character set. */ | |
1472 | if (!APPLY_CONVERSION (cvt, &c, 1, tbuf)) | |
1473 | cpp_errno (pfile, CPP_DL_ERROR, | |
1474 | "converting escape sequence to execution character set"); | |
1475 | ||
1476 | if (loc_reader) | |
1477 | { | |
1478 | char_range.m_finish = loc_reader->get_next ().m_finish; | |
1479 | ranges->add_range (char_range); | |
1480 | } | |
ebc03810 | 1481 | |
1482 | return from + 1; | |
1483 | } | |
1484 | \f | |
924bbf02 | 1485 | /* TYPE is a token type. The return value is the conversion needed to |
1486 | convert from source to execution character set for the given type. */ | |
1487 | static struct cset_converter | |
1488 | converter_for_type (cpp_reader *pfile, enum cpp_ttype type) | |
1489 | { | |
1490 | switch (type) | |
1491 | { | |
1492 | default: | |
1493 | return pfile->narrow_cset_desc; | |
30b1ba42 | 1494 | case CPP_UTF8CHAR: |
538ba11a | 1495 | case CPP_UTF8STRING: |
1496 | return pfile->utf8_cset_desc; | |
924bbf02 | 1497 | case CPP_CHAR16: |
1498 | case CPP_STRING16: | |
1499 | return pfile->char16_cset_desc; | |
1500 | case CPP_CHAR32: | |
1501 | case CPP_STRING32: | |
1502 | return pfile->char32_cset_desc; | |
1503 | case CPP_WCHAR: | |
1504 | case CPP_WSTRING: | |
1505 | return pfile->wide_cset_desc; | |
1506 | } | |
1507 | } | |
1508 | ||
ebc03810 | 1509 | /* FROM is an array of cpp_string structures of length COUNT. These |
1510 | are to be converted from the source to the execution character set, | |
1511 | escape sequences translated, and finally all are to be | |
1512 | concatenated. WIDE indicates whether or not to produce a wide | |
d4166bdc | 1513 | string. If TO is non-NULL, the result is written into TO. |
1514 | If LOC_READERS and OUT are non-NULL, then location information | |
1515 | is read from LOC_READERS (which must be an array of length COUNT), | |
1516 | and location information is written to *RANGES. | |
1517 | ||
1518 | Returns true for success, false for failure. */ | |
1519 | ||
1520 | static bool | |
1521 | cpp_interpret_string_1 (cpp_reader *pfile, const cpp_string *from, size_t count, | |
1522 | cpp_string *to, enum cpp_ttype type, | |
1523 | cpp_string_location_reader *loc_readers, | |
1524 | cpp_substring_ranges *out) | |
ebc03810 | 1525 | { |
f579c40a | 1526 | struct _cpp_strbuf tbuf; |
ebc03810 | 1527 | const uchar *p, *base, *limit; |
1528 | size_t i; | |
924bbf02 | 1529 | struct cset_converter cvt = converter_for_type (pfile, type); |
ebc03810 | 1530 | |
d4166bdc | 1531 | /* loc_readers and out must either be both NULL, or both be non-NULL. */ |
1532 | gcc_assert ((loc_readers != NULL) == (out != NULL)); | |
1533 | ||
1534 | if (to) | |
1535 | { | |
1536 | tbuf.asize = MAX (OUTBUF_BLOCK_SIZE, from->len); | |
1537 | tbuf.text = XNEWVEC (uchar, tbuf.asize); | |
1538 | tbuf.len = 0; | |
1539 | } | |
ebc03810 | 1540 | |
7413e757 | 1541 | cpp_string_location_reader *loc_reader = NULL; |
ebc03810 | 1542 | for (i = 0; i < count; i++) |
1543 | { | |
d4166bdc | 1544 | if (loc_readers) |
1545 | loc_reader = &loc_readers[i]; | |
1546 | ||
ebc03810 | 1547 | p = from[i].text; |
538ba11a | 1548 | if (*p == 'u') |
1549 | { | |
d4166bdc | 1550 | p++; |
1551 | if (loc_reader) | |
1552 | loc_reader->get_next (); | |
1553 | if (*p == '8') | |
1554 | { | |
1555 | p++; | |
1556 | if (loc_reader) | |
1557 | loc_reader->get_next (); | |
1558 | } | |
538ba11a | 1559 | } |
1560 | else if (*p == 'L' || *p == 'U') p++; | |
1561 | if (*p == 'R') | |
1562 | { | |
1563 | const uchar *prefix; | |
1564 | ||
1565 | /* Skip over 'R"'. */ | |
1566 | p += 2; | |
f9f26759 | 1567 | if (loc_reader) |
1568 | { | |
1569 | loc_reader->get_next (); | |
1570 | loc_reader->get_next (); | |
1571 | } | |
538ba11a | 1572 | prefix = p; |
7fe0ef3a | 1573 | while (*p != '(') |
f9f26759 | 1574 | { |
1575 | p++; | |
1576 | if (loc_reader) | |
1577 | loc_reader->get_next (); | |
1578 | } | |
538ba11a | 1579 | p++; |
f9f26759 | 1580 | if (loc_reader) |
1581 | loc_reader->get_next (); | |
538ba11a | 1582 | limit = from[i].text + from[i].len; |
1583 | if (limit >= p + (p - prefix) + 1) | |
1584 | limit -= (p - prefix) + 1; | |
1585 | ||
3a45011c | 1586 | /* Raw strings are all normal characters; these can be fed |
1587 | directly to convert_cset. */ | |
d4166bdc | 1588 | if (to) |
1589 | if (!APPLY_CONVERSION (cvt, p, limit - p, &tbuf)) | |
1590 | goto fail; | |
1591 | ||
1592 | if (loc_reader) | |
1593 | { | |
1594 | /* If generating source ranges, assume we have a 1:1 | |
1595 | correspondence between bytes in the source encoding and bytes | |
1596 | in the execution encoding (e.g. if we have a UTF-8 to UTF-8 | |
1597 | conversion), so that this run of bytes in the source file | |
1598 | corresponds to a run of bytes in the execution string. | |
1599 | This requirement is guaranteed by an early-reject in | |
1600 | cpp_interpret_string_ranges. */ | |
1601 | gcc_assert (cvt.func == convert_no_conversion); | |
1602 | out->add_n_ranges (limit - p, *loc_reader); | |
1603 | } | |
538ba11a | 1604 | |
1605 | continue; | |
1606 | } | |
1607 | ||
d4166bdc | 1608 | /* If we don't now have a leading quote, something has gone wrong. |
1609 | This can occur if cpp_interpret_string_ranges is handling a | |
1610 | stringified macro argument, but should not be possible otherwise. */ | |
1611 | if (*p != '"' && *p != '\'') | |
1612 | { | |
1613 | gcc_assert (out != NULL); | |
1614 | cpp_error (pfile, CPP_DL_ERROR, "missing open quote"); | |
1615 | if (to) | |
1616 | free (tbuf.text); | |
1617 | return false; | |
1618 | } | |
1619 | ||
1620 | /* Skip leading quote. */ | |
1621 | p++; | |
1622 | if (loc_reader) | |
1623 | loc_reader->get_next (); | |
1624 | ||
21dda4ee | 1625 | limit = from[i].text + from[i].len - 1; /* Skip trailing quote. */ |
ebc03810 | 1626 | |
1627 | for (;;) | |
1628 | { | |
1629 | base = p; | |
1630 | while (p < limit && *p != '\\') | |
1631 | p++; | |
1632 | if (p > base) | |
1633 | { | |
1634 | /* We have a run of normal characters; these can be fed | |
1635 | directly to convert_cset. */ | |
d4166bdc | 1636 | if (to) |
1637 | if (!APPLY_CONVERSION (cvt, base, p - base, &tbuf)) | |
1638 | goto fail; | |
1639 | /* Similar to above: assumes we have a 1:1 correspondence | |
1640 | between bytes in the source encoding and bytes in the | |
1641 | execution encoding. */ | |
1642 | if (loc_reader) | |
1643 | { | |
1644 | gcc_assert (cvt.func == convert_no_conversion); | |
1645 | out->add_n_ranges (p - base, *loc_reader); | |
1646 | } | |
ebc03810 | 1647 | } |
d4166bdc | 1648 | if (p >= limit) |
ebc03810 | 1649 | break; |
1650 | ||
d4166bdc | 1651 | struct _cpp_strbuf *tbuf_ptr = to ? &tbuf : NULL; |
1652 | p = convert_escape (pfile, p + 1, limit, tbuf_ptr, cvt, | |
1653 | loc_reader, out); | |
ebc03810 | 1654 | } |
1655 | } | |
d4166bdc | 1656 | |
1657 | if (to) | |
1658 | { | |
1659 | /* NUL-terminate the 'to' buffer and translate it to a cpp_string | |
1660 | structure. */ | |
1661 | emit_numeric_escape (pfile, 0, &tbuf, cvt); | |
1662 | tbuf.text = XRESIZEVEC (uchar, tbuf.text, tbuf.len); | |
1663 | to->text = tbuf.text; | |
1664 | to->len = tbuf.len; | |
1665 | } | |
7413e757 | 1666 | /* Use the location of the trailing quote as the location of the |
1667 | NUL-terminator. */ | |
1668 | if (loc_reader) | |
1669 | { | |
1670 | source_range range = loc_reader->get_next (); | |
1671 | out->add_range (range); | |
1672 | } | |
d4166bdc | 1673 | |
ebc03810 | 1674 | return true; |
1675 | ||
1676 | fail: | |
d80d2074 | 1677 | cpp_errno (pfile, CPP_DL_ERROR, "converting to execution character set"); |
d4166bdc | 1678 | if (to) |
1679 | free (tbuf.text); | |
ebc03810 | 1680 | return false; |
1681 | } | |
9a432f9a | 1682 | |
d4166bdc | 1683 | /* FROM is an array of cpp_string structures of length COUNT. These |
1684 | are to be converted from the source to the execution character set, | |
1685 | escape sequences translated, and finally all are to be | |
1686 | concatenated. WIDE indicates whether or not to produce a wide | |
1687 | string. The result is written into TO. Returns true for success, | |
1688 | false for failure. */ | |
1689 | bool | |
1690 | cpp_interpret_string (cpp_reader *pfile, const cpp_string *from, size_t count, | |
1691 | cpp_string *to, enum cpp_ttype type) | |
1692 | { | |
1693 | return cpp_interpret_string_1 (pfile, from, count, to, type, NULL, NULL); | |
1694 | } | |
1695 | ||
fb225cf1 | 1696 | /* A "do nothing" diagnostic-handling callback for use by |
d4166bdc | 1697 | cpp_interpret_string_ranges, so that it can temporarily suppress |
fb225cf1 | 1698 | diagnostic-handling. */ |
d4166bdc | 1699 | |
1700 | static bool | |
fb225cf1 | 1701 | noop_diagnostic_cb (cpp_reader *, enum cpp_diagnostic_level, |
1702 | enum cpp_warning_reason, rich_location *, | |
1703 | const char *, va_list *) | |
d4166bdc | 1704 | { |
1705 | /* no-op. */ | |
1706 | return true; | |
1707 | } | |
1708 | ||
1709 | /* This function mimics the behavior of cpp_interpret_string, but | |
1710 | rather than generating a string in the execution character set, | |
1711 | *OUT is written to with the source code ranges of the characters | |
1712 | in such a string. | |
1713 | FROM and LOC_READERS should both be arrays of length COUNT. | |
1714 | Returns NULL for success, or an error message for failure. */ | |
1715 | ||
1716 | const char * | |
1717 | cpp_interpret_string_ranges (cpp_reader *pfile, const cpp_string *from, | |
1718 | cpp_string_location_reader *loc_readers, | |
1719 | size_t count, | |
1720 | cpp_substring_ranges *out, | |
1721 | enum cpp_ttype type) | |
1722 | { | |
1723 | /* There are a couple of cases in the range-handling in | |
1724 | cpp_interpret_string_1 that rely on there being a 1:1 correspondence | |
1725 | between bytes in the source encoding and bytes in the execution | |
1726 | encoding, so that each byte in the execution string can correspond | |
1727 | to the location of a byte in the source string. | |
1728 | ||
1729 | This holds for the typical case of a UTF-8 to UTF-8 conversion. | |
1730 | Enforce this requirement by only attempting to track substring | |
1731 | locations if we have source encoding == execution encoding. | |
1732 | ||
1733 | This is a stronger condition than we need, since we could e.g. | |
1734 | have ASCII to EBCDIC (with 1 byte per character before and after), | |
1735 | but it seems to be a reasonable restriction. */ | |
1736 | struct cset_converter cvt = converter_for_type (pfile, type); | |
1737 | if (cvt.func != convert_no_conversion) | |
1738 | return "execution character set != source character set"; | |
1739 | ||
1740 | /* For on-demand strings we have already lexed the strings, so there | |
fb225cf1 | 1741 | should be no diagnostics. However, if we have bogus source location |
d4166bdc | 1742 | data (or stringified macro arguments), the attempt to lex the |
fb225cf1 | 1743 | strings could fail with an diagnostic. Temporarily install an |
1744 | diagnostic-handler to catch the diagnostic, so that it can lead to this call | |
d4166bdc | 1745 | failing, rather than being emitted as a user-visible diagnostic. |
fb225cf1 | 1746 | If an diagnostic does occur, we should see it via the return value of |
d4166bdc | 1747 | cpp_interpret_string_1. */ |
fb225cf1 | 1748 | bool (*saved_diagnostic_handler) (cpp_reader *, enum cpp_diagnostic_level, |
1749 | enum cpp_warning_reason, rich_location *, | |
1750 | const char *, va_list *) | |
d4166bdc | 1751 | ATTRIBUTE_FPTR_PRINTF(5,0); |
1752 | ||
fb225cf1 | 1753 | saved_diagnostic_handler = pfile->cb.diagnostic; |
1754 | pfile->cb.diagnostic = noop_diagnostic_cb; | |
d4166bdc | 1755 | |
1756 | bool result = cpp_interpret_string_1 (pfile, from, count, NULL, type, | |
1757 | loc_readers, out); | |
1758 | ||
fb225cf1 | 1759 | /* Restore the saved diagnostic-handler. */ |
1760 | pfile->cb.diagnostic = saved_diagnostic_handler; | |
d4166bdc | 1761 | |
1762 | if (!result) | |
1763 | return "cpp_interpret_string_1 failed"; | |
1764 | ||
1765 | /* Success. */ | |
1766 | return NULL; | |
1767 | } | |
1768 | ||
9a432f9a | 1769 | /* Subroutine of do_line and do_linemarker. Convert escape sequences |
1770 | in a string, but do not perform character set conversion. */ | |
1771 | bool | |
7bc95b56 | 1772 | cpp_interpret_string_notranslate (cpp_reader *pfile, const cpp_string *from, |
924bbf02 | 1773 | size_t count, cpp_string *to, |
1774 | enum cpp_ttype type ATTRIBUTE_UNUSED) | |
9a432f9a | 1775 | { |
1776 | struct cset_converter save_narrow_cset_desc = pfile->narrow_cset_desc; | |
1777 | bool retval; | |
1778 | ||
1779 | pfile->narrow_cset_desc.func = convert_no_conversion; | |
1780 | pfile->narrow_cset_desc.cd = (iconv_t) -1; | |
bfa57d81 | 1781 | pfile->narrow_cset_desc.width = CPP_OPTION (pfile, char_precision); |
9a432f9a | 1782 | |
924bbf02 | 1783 | retval = cpp_interpret_string (pfile, from, count, to, CPP_STRING); |
9a432f9a | 1784 | |
1785 | pfile->narrow_cset_desc = save_narrow_cset_desc; | |
1786 | return retval; | |
1787 | } | |
1788 | ||
ebc03810 | 1789 | \f |
1790 | /* Subroutine of cpp_interpret_charconst which performs the conversion | |
1791 | to a number, for narrow strings. STR is the string structure returned | |
1792 | by cpp_interpret_string. PCHARS_SEEN and UNSIGNEDP are as for | |
1793 | cpp_interpret_charconst. */ | |
1794 | static cppchar_t | |
1795 | narrow_str_to_charconst (cpp_reader *pfile, cpp_string str, | |
1796 | unsigned int *pchars_seen, int *unsignedp) | |
1797 | { | |
1798 | size_t width = CPP_OPTION (pfile, char_precision); | |
1799 | size_t max_chars = CPP_OPTION (pfile, int_precision) / width; | |
1800 | size_t mask = width_to_mask (width); | |
1801 | size_t i; | |
1802 | cppchar_t result, c; | |
1803 | bool unsigned_p; | |
1804 | ||
1805 | /* The value of a multi-character character constant, or a | |
1806 | single-character character constant whose representation in the | |
1807 | execution character set is more than one byte long, is | |
1808 | implementation defined. This implementation defines it to be the | |
1809 | number formed by interpreting the byte sequence in memory as a | |
1810 | big-endian binary number. If overflow occurs, the high bytes are | |
1811 | lost, and a warning is issued. | |
1812 | ||
1813 | We don't want to process the NUL terminator handed back by | |
1814 | cpp_interpret_string. */ | |
1815 | result = 0; | |
1816 | for (i = 0; i < str.len - 1; i++) | |
1817 | { | |
1818 | c = str.text[i] & mask; | |
1819 | if (width < BITS_PER_CPPCHAR_T) | |
1820 | result = (result << width) | c; | |
1821 | else | |
1822 | result = c; | |
1823 | } | |
1824 | ||
1825 | if (i > max_chars) | |
1826 | { | |
1827 | i = max_chars; | |
d80d2074 | 1828 | cpp_error (pfile, CPP_DL_WARNING, |
1829 | "character constant too long for its type"); | |
ebc03810 | 1830 | } |
1831 | else if (i > 1 && CPP_OPTION (pfile, warn_multichar)) | |
3a79f5da | 1832 | cpp_warning (pfile, CPP_W_MULTICHAR, "multi-character character constant"); |
ebc03810 | 1833 | |
1834 | /* Multichar constants are of type int and therefore signed. */ | |
1835 | if (i > 1) | |
1836 | unsigned_p = 0; | |
1837 | else | |
1838 | unsigned_p = CPP_OPTION (pfile, unsigned_char); | |
1839 | ||
1840 | /* Truncate the constant to its natural width, and simultaneously | |
1841 | sign- or zero-extend to the full width of cppchar_t. | |
1842 | For single-character constants, the value is WIDTH bits wide. | |
1843 | For multi-character constants, the value is INT_PRECISION bits wide. */ | |
1844 | if (i > 1) | |
1845 | width = CPP_OPTION (pfile, int_precision); | |
1846 | if (width < BITS_PER_CPPCHAR_T) | |
1847 | { | |
1848 | mask = ((cppchar_t) 1 << width) - 1; | |
1849 | if (unsigned_p || !(result & (1 << (width - 1)))) | |
1850 | result &= mask; | |
1851 | else | |
1852 | result |= ~mask; | |
1853 | } | |
1854 | *pchars_seen = i; | |
1855 | *unsignedp = unsigned_p; | |
1856 | return result; | |
1857 | } | |
787c3d1a | 1858 | |
ebc03810 | 1859 | /* Subroutine of cpp_interpret_charconst which performs the conversion |
1860 | to a number, for wide strings. STR is the string structure returned | |
1861 | by cpp_interpret_string. PCHARS_SEEN and UNSIGNEDP are as for | |
924bbf02 | 1862 | cpp_interpret_charconst. TYPE is the token type. */ |
ebc03810 | 1863 | static cppchar_t |
1864 | wide_str_to_charconst (cpp_reader *pfile, cpp_string str, | |
924bbf02 | 1865 | unsigned int *pchars_seen, int *unsignedp, |
1866 | enum cpp_ttype type) | |
ebc03810 | 1867 | { |
1868 | bool bigend = CPP_OPTION (pfile, bytes_big_endian); | |
924bbf02 | 1869 | size_t width = converter_for_type (pfile, type).width; |
ebc03810 | 1870 | size_t cwidth = CPP_OPTION (pfile, char_precision); |
1871 | size_t mask = width_to_mask (width); | |
1872 | size_t cmask = width_to_mask (cwidth); | |
1873 | size_t nbwc = width / cwidth; | |
1874 | size_t off, i; | |
1875 | cppchar_t result = 0, c; | |
1876 | ||
1877 | /* This is finicky because the string is in the target's byte order, | |
1878 | which may not be our byte order. Only the last character, ignoring | |
1879 | the NUL terminator, is relevant. */ | |
1880 | off = str.len - (nbwc * 2); | |
1881 | result = 0; | |
1882 | for (i = 0; i < nbwc; i++) | |
1883 | { | |
1884 | c = bigend ? str.text[off + i] : str.text[off + nbwc - i - 1]; | |
1885 | result = (result << cwidth) | (c & cmask); | |
1886 | } | |
1887 | ||
1888 | /* Wide character constants have type wchar_t, and a single | |
1889 | character exactly fills a wchar_t, so a multi-character wide | |
1890 | character constant is guaranteed to overflow. */ | |
924bbf02 | 1891 | if (str.len > nbwc * 2) |
d80d2074 | 1892 | cpp_error (pfile, CPP_DL_WARNING, |
1893 | "character constant too long for its type"); | |
ebc03810 | 1894 | |
1895 | /* Truncate the constant to its natural width, and simultaneously | |
1896 | sign- or zero-extend to the full width of cppchar_t. */ | |
1897 | if (width < BITS_PER_CPPCHAR_T) | |
1898 | { | |
924bbf02 | 1899 | if (type == CPP_CHAR16 || type == CPP_CHAR32 |
1900 | || CPP_OPTION (pfile, unsigned_wchar) | |
1901 | || !(result & (1 << (width - 1)))) | |
ebc03810 | 1902 | result &= mask; |
1903 | else | |
1904 | result |= ~mask; | |
1905 | } | |
1906 | ||
924bbf02 | 1907 | if (type == CPP_CHAR16 || type == CPP_CHAR32 |
1908 | || CPP_OPTION (pfile, unsigned_wchar)) | |
1909 | *unsignedp = 1; | |
1910 | else | |
1911 | *unsignedp = 0; | |
1912 | ||
ebc03810 | 1913 | *pchars_seen = 1; |
1914 | return result; | |
1915 | } | |
1916 | ||
1917 | /* Interpret a (possibly wide) character constant in TOKEN. | |
1918 | PCHARS_SEEN points to a variable that is filled in with the number | |
1919 | of characters seen, and UNSIGNEDP to a variable that indicates | |
1920 | whether the result has signed type. */ | |
1921 | cppchar_t | |
1922 | cpp_interpret_charconst (cpp_reader *pfile, const cpp_token *token, | |
1923 | unsigned int *pchars_seen, int *unsignedp) | |
1924 | { | |
1925 | cpp_string str = { 0, 0 }; | |
30b1ba42 | 1926 | bool wide = (token->type != CPP_CHAR && token->type != CPP_UTF8CHAR); |
1927 | int u8 = 2 * int(token->type == CPP_UTF8CHAR); | |
ebc03810 | 1928 | cppchar_t result; |
1929 | ||
30b1ba42 | 1930 | /* An empty constant will appear as L'', u'', U'', u8'', or '' */ |
1931 | if (token->val.str.len == (size_t) (2 + wide + u8)) | |
ebc03810 | 1932 | { |
d80d2074 | 1933 | cpp_error (pfile, CPP_DL_ERROR, "empty character constant"); |
1e302465 | 1934 | *pchars_seen = 0; |
1935 | *unsignedp = 0; | |
1936 | return 0; | |
1937 | } | |
1938 | else if (!cpp_interpret_string (pfile, &token->val.str, 1, &str, | |
1939 | token->type)) | |
1940 | { | |
1941 | *pchars_seen = 0; | |
1942 | *unsignedp = 0; | |
ebc03810 | 1943 | return 0; |
1944 | } | |
ebc03810 | 1945 | |
1946 | if (wide) | |
924bbf02 | 1947 | result = wide_str_to_charconst (pfile, str, pchars_seen, unsignedp, |
1948 | token->type); | |
ebc03810 | 1949 | else |
1950 | result = narrow_str_to_charconst (pfile, str, pchars_seen, unsignedp); | |
1951 | ||
1952 | if (str.text != token->val.str.text) | |
1953 | free ((void *)str.text); | |
1954 | ||
1955 | return result; | |
2cbf1359 | 1956 | } |
bb1fa6bb | 1957 | \f |
1958 | /* Convert an identifier denoted by ID and LEN, which might contain | |
1959 | UCN escapes, to the source character set, either UTF-8 or | |
1960 | UTF-EBCDIC. Assumes that the identifier is actually a valid identifier. */ | |
1961 | cpp_hashnode * | |
1962 | _cpp_interpret_identifier (cpp_reader *pfile, const uchar *id, size_t len) | |
1963 | { | |
1964 | /* It turns out that a UCN escape always turns into fewer characters | |
1965 | than the escape itself, so we can allocate a temporary in advance. */ | |
720aca92 | 1966 | uchar * buf = (uchar *) alloca (len + 1); |
bb1fa6bb | 1967 | uchar * bufp = buf; |
1968 | size_t idp; | |
1969 | ||
1970 | for (idp = 0; idp < len; idp++) | |
1971 | if (id[idp] != '\\') | |
1972 | *bufp++ = id[idp]; | |
1973 | else | |
1974 | { | |
1975 | unsigned length = id[idp+1] == 'u' ? 4 : 8; | |
1976 | cppchar_t value = 0; | |
1977 | size_t bufleft = len - (bufp - buf); | |
1978 | int rval; | |
1979 | ||
1980 | idp += 2; | |
1981 | while (length && idp < len && ISXDIGIT (id[idp])) | |
1982 | { | |
1983 | value = (value << 4) + hex_value (id[idp]); | |
1984 | idp++; | |
1985 | length--; | |
1986 | } | |
1987 | idp--; | |
1988 | ||
1989 | /* Special case for EBCDIC: if the identifier contains | |
1990 | a '$' specified using a UCN, translate it to EBCDIC. */ | |
1991 | if (value == 0x24) | |
1992 | { | |
1993 | *bufp++ = '$'; | |
1994 | continue; | |
1995 | } | |
1996 | ||
1997 | rval = one_cppchar_to_utf8 (value, &bufp, &bufleft); | |
1998 | if (rval) | |
1999 | { | |
2000 | errno = rval; | |
2001 | cpp_errno (pfile, CPP_DL_ERROR, | |
2002 | "converting UCN to source character set"); | |
2003 | break; | |
2004 | } | |
2005 | } | |
787c3d1a | 2006 | |
bb1fa6bb | 2007 | return CPP_HASHNODE (ht_lookup (pfile->hash_table, |
2008 | buf, bufp - buf, HT_ALLOC)); | |
2009 | } | |
2010 | \f | |
0097f6a2 | 2011 | /* Convert an input buffer (containing the complete contents of one |
2012 | source file) from INPUT_CHARSET to the source character set. INPUT | |
2013 | points to the input buffer, SIZE is its allocated size, and LEN is | |
2014 | the length of the meaningful data within the buffer. The | |
d656d07a | 2015 | translated buffer is returned, *ST_SIZE is set to the length of |
2016 | the meaningful data within the translated buffer, and *BUFFER_START | |
2017 | is set to the start of the returned buffer. *BUFFER_START may | |
2018 | differ from the return value in the case of a BOM or other ignored | |
2019 | marker information. | |
2020 | ||
2021 | INPUT is expected to have been allocated with xmalloc. This | |
2022 | function will either set *BUFFER_START to INPUT, or free it and set | |
2023 | *BUFFER_START to a pointer to another xmalloc-allocated block of | |
2024 | memory. */ | |
0097f6a2 | 2025 | uchar * |
57ba96e9 | 2026 | _cpp_convert_input (cpp_reader *pfile, const char *input_charset, |
d656d07a | 2027 | uchar *input, size_t size, size_t len, |
2028 | const unsigned char **buffer_start, off_t *st_size) | |
787c3d1a | 2029 | { |
57ba96e9 | 2030 | struct cset_converter input_cset; |
2031 | struct _cpp_strbuf to; | |
d656d07a | 2032 | unsigned char *buffer; |
787c3d1a | 2033 | |
57ba96e9 | 2034 | input_cset = init_iconv_desc (pfile, SOURCE_CHARSET, input_charset); |
2035 | if (input_cset.func == convert_no_conversion) | |
2036 | { | |
2037 | to.text = input; | |
2038 | to.asize = size; | |
2039 | to.len = len; | |
2040 | } | |
2041 | else | |
2042 | { | |
2043 | to.asize = MAX (65536, len); | |
720aca92 | 2044 | to.text = XNEWVEC (uchar, to.asize); |
57ba96e9 | 2045 | to.len = 0; |
787c3d1a | 2046 | |
57ba96e9 | 2047 | if (!APPLY_CONVERSION (input_cset, input, len, &to)) |
2048 | cpp_error (pfile, CPP_DL_ERROR, | |
2049 | "failure to convert %s to %s", | |
2050 | CPP_OPTION (pfile, input_charset), SOURCE_CHARSET); | |
787c3d1a | 2051 | |
57ba96e9 | 2052 | free (input); |
2053 | } | |
787c3d1a | 2054 | |
57ba96e9 | 2055 | /* Clean up the mess. */ |
2056 | if (input_cset.func == convert_using_iconv) | |
2057 | iconv_close (input_cset.cd); | |
787c3d1a | 2058 | |
57ba96e9 | 2059 | /* Resize buffer if we allocated substantially too much, or if we |
8e1d1b0c | 2060 | haven't enough space for the \n-terminator or following |
2061 | 15 bytes of padding (used to quiet warnings from valgrind or | |
2062 | Address Sanitizer, when the optimized lexer accesses aligned | |
2063 | 16-byte memory chunks, including the bytes after the malloced, | |
2064 | area, and stops lexing on '\n'). */ | |
2065 | if (to.len + 4096 < to.asize || to.len + 16 > to.asize) | |
2066 | to.text = XRESIZEVEC (uchar, to.text, to.len + 16); | |
2067 | ||
2068 | memset (to.text + to.len, '\0', 16); | |
787c3d1a | 2069 | |
f86986bc | 2070 | /* If the file is using old-school Mac line endings (\r only), |
2071 | terminate with another \r, not an \n, so that we do not mistake | |
2072 | the \r\n sequence for a single DOS line ending and erroneously | |
2073 | issue the "No newline at end of file" diagnostic. */ | |
854f075e | 2074 | if (to.len && to.text[to.len - 1] == '\r') |
f86986bc | 2075 | to.text[to.len] = '\r'; |
2076 | else | |
2077 | to.text[to.len] = '\n'; | |
2078 | ||
d656d07a | 2079 | buffer = to.text; |
57ba96e9 | 2080 | *st_size = to.len; |
d656d07a | 2081 | #if HOST_CHARSET == HOST_CHARSET_ASCII |
2082 | /* The HOST_CHARSET test just above ensures that the source charset | |
2083 | is UTF-8. So, ignore a UTF-8 BOM if we see one. Note that | |
2084 | glib'c UTF-8 iconv() provider (as of glibc 2.7) does not ignore a | |
2085 | BOM -- however, even if it did, we would still need this code due | |
2086 | to the 'convert_no_conversion' case. */ | |
2087 | if (to.len >= 3 && to.text[0] == 0xef && to.text[1] == 0xbb | |
2088 | && to.text[2] == 0xbf) | |
2089 | { | |
2090 | *st_size -= 3; | |
2091 | buffer += 3; | |
2092 | } | |
2093 | #endif | |
2094 | ||
2095 | *buffer_start = to.text; | |
2096 | return buffer; | |
787c3d1a | 2097 | } |
2098 | ||
0097f6a2 | 2099 | /* Decide on the default encoding to assume for input files. */ |
57ba96e9 | 2100 | const char * |
2101 | _cpp_default_encoding (void) | |
787c3d1a | 2102 | { |
57ba96e9 | 2103 | const char *current_encoding = NULL; |
2104 | ||
d856c8a6 | 2105 | /* We disable this because the default codeset is 7-bit ASCII on |
2106 | most platforms, and this causes conversion failures on every | |
2107 | file in GCC that happens to have one of the upper 128 characters | |
2108 | in it -- most likely, as part of the name of a contributor. | |
2109 | We should definitely recognize in-band markers of file encoding, | |
2110 | like: | |
2111 | - the appropriate Unicode byte-order mark (FE FF) to recognize | |
2112 | UTF16 and UCS4 (in both big-endian and little-endian flavors) | |
2113 | and UTF8 | |
3eb3f293 | 2114 | - a "#i", "#d", "/ *", "//", " #p" or "#p" (for #pragma) to |
d856c8a6 | 2115 | distinguish ASCII and EBCDIC. |
2116 | - now we can parse something like "#pragma GCC encoding <xyz> | |
2117 | on the first line, or even Emacs/VIM's mode line tags (there's | |
2118 | a problem here in that VIM uses the last line, and Emacs has | |
0097f6a2 | 2119 | its more elaborate "local variables" convention). |
d856c8a6 | 2120 | - investigate whether Java has another common convention, which |
2121 | would be friendly to support. | |
2122 | (Zack Weinberg and Paolo Bonzini, May 20th 2004) */ | |
2123 | #if defined (HAVE_LOCALE_H) && defined (HAVE_LANGINFO_CODESET) && 0 | |
57ba96e9 | 2124 | setlocale (LC_CTYPE, ""); |
2125 | current_encoding = nl_langinfo (CODESET); | |
2126 | #endif | |
2127 | if (current_encoding == NULL || *current_encoding == '\0') | |
2128 | current_encoding = SOURCE_CHARSET; | |
2129 | ||
2130 | return current_encoding; | |
787c3d1a | 2131 | } |
d4166bdc | 2132 | |
2133 | /* Implementation of class cpp_string_location_reader. */ | |
2134 | ||
2135 | /* Constructor for cpp_string_location_reader. */ | |
2136 | ||
2137 | cpp_string_location_reader:: | |
be1e7283 | 2138 | cpp_string_location_reader (location_t src_loc, |
d4166bdc | 2139 | line_maps *line_table) |
2140 | : m_line_table (line_table) | |
2141 | { | |
2142 | src_loc = get_range_from_loc (line_table, src_loc).m_start; | |
2143 | ||
2144 | /* SRC_LOC might be a macro location. It only makes sense to do | |
2145 | column-by-column calculations on ordinary maps, so get the | |
2146 | corresponding location in an ordinary map. */ | |
2147 | m_loc | |
2148 | = linemap_resolve_location (line_table, src_loc, | |
2149 | LRK_SPELLING_LOCATION, NULL); | |
2150 | ||
2151 | const line_map_ordinary *map | |
2152 | = linemap_check_ordinary (linemap_lookup (line_table, m_loc)); | |
2153 | m_offset_per_column = (1 << map->m_range_bits); | |
2154 | } | |
2155 | ||
2156 | /* Get the range of the next source byte. */ | |
2157 | ||
2158 | source_range | |
2159 | cpp_string_location_reader::get_next () | |
2160 | { | |
2161 | source_range result; | |
2162 | result.m_start = m_loc; | |
2163 | result.m_finish = m_loc; | |
2164 | if (m_loc <= LINE_MAP_MAX_LOCATION_WITH_COLS) | |
2165 | m_loc += m_offset_per_column; | |
2166 | return result; | |
2167 | } |