Mercurial > hg > CbC > CbC_gcc
annotate libcpp/charset.c @ 67:f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
| author | nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> |
|---|---|
| date | Tue, 22 Mar 2011 17:18:12 +0900 |
| parents | b7f97abdc517 |
| children | 04ced10e8804 |
| rev | line source |
|---|---|
| 0 | 1 /* CPP Library - charsets |
|
67
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update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2 Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2006, 2008, 2009, |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
3 2010 Free Software Foundation, Inc. |
| 0 | 4 |
| 5 Broken out of c-lex.c Apr 2003, adding valid C99 UCN ranges. | |
| 6 | |
| 7 This program is free software; you can redistribute it and/or modify it | |
| 8 under the terms of the GNU General Public License as published by the | |
| 9 Free Software Foundation; either version 3, or (at your option) any | |
| 10 later version. | |
| 11 | |
| 12 This program is distributed in the hope that it will be useful, | |
| 13 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 15 GNU General Public License for more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License | |
| 18 along with this program; see the file COPYING3. If not see | |
| 19 <http://www.gnu.org/licenses/>. */ | |
| 20 | |
| 21 #include "config.h" | |
| 22 #include "system.h" | |
| 23 #include "cpplib.h" | |
| 24 #include "internal.h" | |
| 25 | |
| 26 /* Character set handling for C-family languages. | |
| 27 | |
| 28 Terminological note: In what follows, "charset" or "character set" | |
| 29 will be taken to mean both an abstract set of characters and an | |
| 30 encoding for that set. | |
| 31 | |
| 32 The C99 standard discusses two character sets: source and execution. | |
| 33 The source character set is used for internal processing in translation | |
| 34 phases 1 through 4; the execution character set is used thereafter. | |
| 35 Both are required by 5.2.1.2p1 to be multibyte encodings, not wide | |
| 36 character encodings (see 3.7.2, 3.7.3 for the standardese meanings | |
| 37 of these terms). Furthermore, the "basic character set" (listed in | |
| 38 5.2.1p3) is to be encoded in each with values one byte wide, and is | |
| 39 to appear in the initial shift state. | |
| 40 | |
| 41 It is not explicitly mentioned, but there is also a "wide execution | |
| 42 character set" used to encode wide character constants and wide | |
| 43 string literals; this is supposed to be the result of applying the | |
| 44 standard library function mbstowcs() to an equivalent narrow string | |
| 45 (6.4.5p5). However, the behavior of hexadecimal and octal | |
| 46 \-escapes is at odds with this; they are supposed to be translated | |
| 47 directly to wchar_t values (6.4.4.4p5,6). | |
| 48 | |
| 49 The source character set is not necessarily the character set used | |
| 50 to encode physical source files on disk; translation phase 1 converts | |
| 51 from whatever that encoding is to the source character set. | |
| 52 | |
| 53 The presence of universal character names in C99 (6.4.3 et seq.) | |
| 54 forces the source character set to be isomorphic to ISO 10646, | |
| 55 that is, Unicode. There is no such constraint on the execution | |
| 56 character set; note also that the conversion from source to | |
| 57 execution character set does not occur for identifiers (5.1.1.2p1#5). | |
| 58 | |
| 59 For convenience of implementation, the source character set's | |
| 60 encoding of the basic character set should be identical to the | |
| 61 execution character set OF THE HOST SYSTEM's encoding of the basic | |
| 62 character set, and it should not be a state-dependent encoding. | |
| 63 | |
| 64 cpplib uses UTF-8 or UTF-EBCDIC for the source character set, | |
| 65 depending on whether the host is based on ASCII or EBCDIC (see | |
| 66 respectively Unicode section 2.3/ISO10646 Amendment 2, and Unicode | |
| 67 Technical Report #16). With limited exceptions, it relies on the | |
| 68 system library's iconv() primitive to do charset conversion | |
| 69 (specified in SUSv2). */ | |
| 70 | |
| 71 #if !HAVE_ICONV | |
| 72 /* Make certain that the uses of iconv(), iconv_open(), iconv_close() | |
| 73 below, which are guarded only by if statements with compile-time | |
| 74 constant conditions, do not cause link errors. */ | |
| 75 #define iconv_open(x, y) (errno = EINVAL, (iconv_t)-1) | |
| 76 #define iconv(a,b,c,d,e) (errno = EINVAL, (size_t)-1) | |
| 77 #define iconv_close(x) (void)0 | |
| 78 #define ICONV_CONST | |
| 79 #endif | |
| 80 | |
| 81 #if HOST_CHARSET == HOST_CHARSET_ASCII | |
| 82 #define SOURCE_CHARSET "UTF-8" | |
| 83 #define LAST_POSSIBLY_BASIC_SOURCE_CHAR 0x7e | |
| 84 #elif HOST_CHARSET == HOST_CHARSET_EBCDIC | |
| 85 #define SOURCE_CHARSET "UTF-EBCDIC" | |
| 86 #define LAST_POSSIBLY_BASIC_SOURCE_CHAR 0xFF | |
| 87 #else | |
| 88 #error "Unrecognized basic host character set" | |
| 89 #endif | |
| 90 | |
| 91 #ifndef EILSEQ | |
| 92 #define EILSEQ EINVAL | |
| 93 #endif | |
| 94 | |
| 95 /* This structure is used for a resizable string buffer throughout. */ | |
| 96 /* Don't call it strbuf, as that conflicts with unistd.h on systems | |
| 97 such as DYNIX/ptx where unistd.h includes stropts.h. */ | |
| 98 struct _cpp_strbuf | |
| 99 { | |
| 100 uchar *text; | |
| 101 size_t asize; | |
| 102 size_t len; | |
| 103 }; | |
| 104 | |
| 105 /* This is enough to hold any string that fits on a single 80-column | |
| 106 line, even if iconv quadruples its size (e.g. conversion from | |
| 107 ASCII to UTF-32) rounded up to a power of two. */ | |
| 108 #define OUTBUF_BLOCK_SIZE 256 | |
| 109 | |
| 110 /* Conversions between UTF-8 and UTF-16/32 are implemented by custom | |
| 111 logic. This is because a depressing number of systems lack iconv, | |
| 112 or have have iconv libraries that do not do these conversions, so | |
| 113 we need a fallback implementation for them. To ensure the fallback | |
| 114 doesn't break due to neglect, it is used on all systems. | |
| 115 | |
| 116 UTF-32 encoding is nice and simple: a four-byte binary number, | |
| 117 constrained to the range 00000000-7FFFFFFF to avoid questions of | |
| 118 signedness. We do have to cope with big- and little-endian | |
| 119 variants. | |
| 120 | |
| 121 UTF-16 encoding uses two-byte binary numbers, again in big- and | |
| 122 little-endian variants, for all values in the 00000000-0000FFFF | |
| 123 range. Values in the 00010000-0010FFFF range are encoded as pairs | |
| 124 of two-byte numbers, called "surrogate pairs": given a number S in | |
| 125 this range, it is mapped to a pair (H, L) as follows: | |
| 126 | |
| 127 H = (S - 0x10000) / 0x400 + 0xD800 | |
| 128 L = (S - 0x10000) % 0x400 + 0xDC00 | |
| 129 | |
| 130 Two-byte values in the D800...DFFF range are ill-formed except as a | |
| 131 component of a surrogate pair. Even if the encoding within a | |
| 132 two-byte value is little-endian, the H member of the surrogate pair | |
| 133 comes first. | |
| 134 | |
| 135 There is no way to encode values in the 00110000-7FFFFFFF range, | |
| 136 which is not currently a problem as there are no assigned code | |
| 137 points in that range; however, the author expects that it will | |
| 138 eventually become necessary to abandon UTF-16 due to this | |
| 139 limitation. Note also that, because of these pairs, UTF-16 does | |
| 140 not meet the requirements of the C standard for a wide character | |
| 141 encoding (see 3.7.3 and 6.4.4.4p11). | |
| 142 | |
| 143 UTF-8 encoding looks like this: | |
| 144 | |
| 145 value range encoded as | |
| 146 00000000-0000007F 0xxxxxxx | |
| 147 00000080-000007FF 110xxxxx 10xxxxxx | |
| 148 00000800-0000FFFF 1110xxxx 10xxxxxx 10xxxxxx | |
| 149 00010000-001FFFFF 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx | |
| 150 00200000-03FFFFFF 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx | |
| 151 04000000-7FFFFFFF 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx | |
| 152 | |
| 153 Values in the 0000D800 ... 0000DFFF range (surrogates) are invalid, | |
| 154 which means that three-byte sequences ED xx yy, with A0 <= xx <= BF, | |
| 155 never occur. Note also that any value that can be encoded by a | |
| 156 given row of the table can also be encoded by all successive rows, | |
| 157 but this is not done; only the shortest possible encoding for any | |
| 158 given value is valid. For instance, the character 07C0 could be | |
| 159 encoded as any of DF 80, E0 9F 80, F0 80 9F 80, F8 80 80 9F 80, or | |
| 160 FC 80 80 80 9F 80. Only the first is valid. | |
| 161 | |
| 162 An implementation note: the transformation from UTF-16 to UTF-8, or | |
| 163 vice versa, is easiest done by using UTF-32 as an intermediary. */ | |
| 164 | |
| 165 /* Internal primitives which go from an UTF-8 byte stream to native-endian | |
| 166 UTF-32 in a cppchar_t, or vice versa; this avoids an extra marshal/unmarshal | |
| 167 operation in several places below. */ | |
| 168 static inline int | |
| 169 one_utf8_to_cppchar (const uchar **inbufp, size_t *inbytesleftp, | |
| 170 cppchar_t *cp) | |
| 171 { | |
|
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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172 static const uchar masks[6] = { 0x7F, 0x1F, 0x0F, 0x07, 0x03, 0x01 }; |
| 0 | 173 static const uchar patns[6] = { 0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC }; |
| 174 | |
| 175 cppchar_t c; | |
| 176 const uchar *inbuf = *inbufp; | |
| 177 size_t nbytes, i; | |
| 178 | |
| 179 if (*inbytesleftp < 1) | |
| 180 return EINVAL; | |
| 181 | |
| 182 c = *inbuf; | |
| 183 if (c < 0x80) | |
| 184 { | |
| 185 *cp = c; | |
| 186 *inbytesleftp -= 1; | |
| 187 *inbufp += 1; | |
| 188 return 0; | |
| 189 } | |
| 190 | |
| 191 /* The number of leading 1-bits in the first byte indicates how many | |
| 192 bytes follow. */ | |
| 193 for (nbytes = 2; nbytes < 7; nbytes++) | |
| 194 if ((c & ~masks[nbytes-1]) == patns[nbytes-1]) | |
| 195 goto found; | |
| 196 return EILSEQ; | |
| 197 found: | |
| 198 | |
| 199 if (*inbytesleftp < nbytes) | |
| 200 return EINVAL; | |
| 201 | |
| 202 c = (c & masks[nbytes-1]); | |
| 203 inbuf++; | |
| 204 for (i = 1; i < nbytes; i++) | |
| 205 { | |
| 206 cppchar_t n = *inbuf++; | |
| 207 if ((n & 0xC0) != 0x80) | |
| 208 return EILSEQ; | |
| 209 c = ((c << 6) + (n & 0x3F)); | |
| 210 } | |
| 211 | |
| 212 /* Make sure the shortest possible encoding was used. */ | |
| 213 if (c <= 0x7F && nbytes > 1) return EILSEQ; | |
| 214 if (c <= 0x7FF && nbytes > 2) return EILSEQ; | |
| 215 if (c <= 0xFFFF && nbytes > 3) return EILSEQ; | |
| 216 if (c <= 0x1FFFFF && nbytes > 4) return EILSEQ; | |
| 217 if (c <= 0x3FFFFFF && nbytes > 5) return EILSEQ; | |
| 218 | |
| 219 /* Make sure the character is valid. */ | |
| 220 if (c > 0x7FFFFFFF || (c >= 0xD800 && c <= 0xDFFF)) return EILSEQ; | |
| 221 | |
| 222 *cp = c; | |
| 223 *inbufp = inbuf; | |
| 224 *inbytesleftp -= nbytes; | |
| 225 return 0; | |
| 226 } | |
| 227 | |
| 228 static inline int | |
| 229 one_cppchar_to_utf8 (cppchar_t c, uchar **outbufp, size_t *outbytesleftp) | |
| 230 { | |
| 231 static const uchar masks[6] = { 0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC }; | |
| 232 static const uchar limits[6] = { 0x80, 0xE0, 0xF0, 0xF8, 0xFC, 0xFE }; | |
| 233 size_t nbytes; | |
| 234 uchar buf[6], *p = &buf[6]; | |
| 235 uchar *outbuf = *outbufp; | |
| 236 | |
| 237 nbytes = 1; | |
| 238 if (c < 0x80) | |
| 239 *--p = c; | |
| 240 else | |
| 241 { | |
| 242 do | |
| 243 { | |
| 244 *--p = ((c & 0x3F) | 0x80); | |
| 245 c >>= 6; | |
| 246 nbytes++; | |
| 247 } | |
| 248 while (c >= 0x3F || (c & limits[nbytes-1])); | |
| 249 *--p = (c | masks[nbytes-1]); | |
| 250 } | |
| 251 | |
| 252 if (*outbytesleftp < nbytes) | |
| 253 return E2BIG; | |
| 254 | |
| 255 while (p < &buf[6]) | |
| 256 *outbuf++ = *p++; | |
| 257 *outbytesleftp -= nbytes; | |
| 258 *outbufp = outbuf; | |
| 259 return 0; | |
| 260 } | |
| 261 | |
| 262 /* The following four functions transform one character between the two | |
| 263 encodings named in the function name. All have the signature | |
| 264 int (*)(iconv_t bigend, const uchar **inbufp, size_t *inbytesleftp, | |
| 265 uchar **outbufp, size_t *outbytesleftp) | |
| 266 | |
| 267 BIGEND must have the value 0 or 1, coerced to (iconv_t); it is | |
| 268 interpreted as a boolean indicating whether big-endian or | |
| 269 little-endian encoding is to be used for the member of the pair | |
| 270 that is not UTF-8. | |
| 271 | |
| 272 INBUFP, INBYTESLEFTP, OUTBUFP, OUTBYTESLEFTP work exactly as they | |
| 273 do for iconv. | |
| 274 | |
| 275 The return value is either 0 for success, or an errno value for | |
| 276 failure, which may be E2BIG (need more space), EILSEQ (ill-formed | |
| 277 input sequence), ir EINVAL (incomplete input sequence). */ | |
| 278 | |
| 279 static inline int | |
| 280 one_utf8_to_utf32 (iconv_t bigend, const uchar **inbufp, size_t *inbytesleftp, | |
| 281 uchar **outbufp, size_t *outbytesleftp) | |
| 282 { | |
| 283 uchar *outbuf; | |
| 284 cppchar_t s = 0; | |
| 285 int rval; | |
| 286 | |
| 287 /* Check for space first, since we know exactly how much we need. */ | |
| 288 if (*outbytesleftp < 4) | |
| 289 return E2BIG; | |
| 290 | |
| 291 rval = one_utf8_to_cppchar (inbufp, inbytesleftp, &s); | |
| 292 if (rval) | |
| 293 return rval; | |
| 294 | |
| 295 outbuf = *outbufp; | |
| 296 outbuf[bigend ? 3 : 0] = (s & 0x000000FF); | |
| 297 outbuf[bigend ? 2 : 1] = (s & 0x0000FF00) >> 8; | |
| 298 outbuf[bigend ? 1 : 2] = (s & 0x00FF0000) >> 16; | |
| 299 outbuf[bigend ? 0 : 3] = (s & 0xFF000000) >> 24; | |
| 300 | |
| 301 *outbufp += 4; | |
| 302 *outbytesleftp -= 4; | |
| 303 return 0; | |
| 304 } | |
| 305 | |
| 306 static inline int | |
| 307 one_utf32_to_utf8 (iconv_t bigend, const uchar **inbufp, size_t *inbytesleftp, | |
| 308 uchar **outbufp, size_t *outbytesleftp) | |
| 309 { | |
| 310 cppchar_t s; | |
| 311 int rval; | |
| 312 const uchar *inbuf; | |
| 313 | |
| 314 if (*inbytesleftp < 4) | |
| 315 return EINVAL; | |
| 316 | |
| 317 inbuf = *inbufp; | |
| 318 | |
| 319 s = inbuf[bigend ? 0 : 3] << 24; | |
| 320 s += inbuf[bigend ? 1 : 2] << 16; | |
| 321 s += inbuf[bigend ? 2 : 1] << 8; | |
| 322 s += inbuf[bigend ? 3 : 0]; | |
| 323 | |
| 324 if (s >= 0x7FFFFFFF || (s >= 0xD800 && s <= 0xDFFF)) | |
| 325 return EILSEQ; | |
| 326 | |
| 327 rval = one_cppchar_to_utf8 (s, outbufp, outbytesleftp); | |
| 328 if (rval) | |
| 329 return rval; | |
| 330 | |
| 331 *inbufp += 4; | |
| 332 *inbytesleftp -= 4; | |
| 333 return 0; | |
| 334 } | |
| 335 | |
| 336 static inline int | |
| 337 one_utf8_to_utf16 (iconv_t bigend, const uchar **inbufp, size_t *inbytesleftp, | |
| 338 uchar **outbufp, size_t *outbytesleftp) | |
| 339 { | |
| 340 int rval; | |
| 341 cppchar_t s = 0; | |
| 342 const uchar *save_inbuf = *inbufp; | |
| 343 size_t save_inbytesleft = *inbytesleftp; | |
| 344 uchar *outbuf = *outbufp; | |
| 345 | |
| 346 rval = one_utf8_to_cppchar (inbufp, inbytesleftp, &s); | |
| 347 if (rval) | |
| 348 return rval; | |
| 349 | |
| 350 if (s > 0x0010FFFF) | |
| 351 { | |
| 352 *inbufp = save_inbuf; | |
| 353 *inbytesleftp = save_inbytesleft; | |
| 354 return EILSEQ; | |
| 355 } | |
| 356 | |
| 357 if (s < 0xFFFF) | |
| 358 { | |
| 359 if (*outbytesleftp < 2) | |
| 360 { | |
| 361 *inbufp = save_inbuf; | |
| 362 *inbytesleftp = save_inbytesleft; | |
| 363 return E2BIG; | |
| 364 } | |
| 365 outbuf[bigend ? 1 : 0] = (s & 0x00FF); | |
| 366 outbuf[bigend ? 0 : 1] = (s & 0xFF00) >> 8; | |
| 367 | |
| 368 *outbufp += 2; | |
| 369 *outbytesleftp -= 2; | |
| 370 return 0; | |
| 371 } | |
| 372 else | |
| 373 { | |
| 374 cppchar_t hi, lo; | |
| 375 | |
| 376 if (*outbytesleftp < 4) | |
| 377 { | |
| 378 *inbufp = save_inbuf; | |
| 379 *inbytesleftp = save_inbytesleft; | |
| 380 return E2BIG; | |
| 381 } | |
| 382 | |
| 383 hi = (s - 0x10000) / 0x400 + 0xD800; | |
| 384 lo = (s - 0x10000) % 0x400 + 0xDC00; | |
| 385 | |
| 386 /* Even if we are little-endian, put the high surrogate first. | |
| 387 ??? Matches practice? */ | |
| 388 outbuf[bigend ? 1 : 0] = (hi & 0x00FF); | |
| 389 outbuf[bigend ? 0 : 1] = (hi & 0xFF00) >> 8; | |
| 390 outbuf[bigend ? 3 : 2] = (lo & 0x00FF); | |
| 391 outbuf[bigend ? 2 : 3] = (lo & 0xFF00) >> 8; | |
| 392 | |
| 393 *outbufp += 4; | |
| 394 *outbytesleftp -= 4; | |
| 395 return 0; | |
| 396 } | |
| 397 } | |
| 398 | |
| 399 static inline int | |
| 400 one_utf16_to_utf8 (iconv_t bigend, const uchar **inbufp, size_t *inbytesleftp, | |
| 401 uchar **outbufp, size_t *outbytesleftp) | |
| 402 { | |
| 403 cppchar_t s; | |
| 404 const uchar *inbuf = *inbufp; | |
| 405 int rval; | |
| 406 | |
| 407 if (*inbytesleftp < 2) | |
| 408 return EINVAL; | |
| 409 s = inbuf[bigend ? 0 : 1] << 8; | |
| 410 s += inbuf[bigend ? 1 : 0]; | |
| 411 | |
| 412 /* Low surrogate without immediately preceding high surrogate is invalid. */ | |
| 413 if (s >= 0xDC00 && s <= 0xDFFF) | |
| 414 return EILSEQ; | |
| 415 /* High surrogate must have a following low surrogate. */ | |
| 416 else if (s >= 0xD800 && s <= 0xDBFF) | |
| 417 { | |
| 418 cppchar_t hi = s, lo; | |
| 419 if (*inbytesleftp < 4) | |
| 420 return EINVAL; | |
| 421 | |
| 422 lo = inbuf[bigend ? 2 : 3] << 8; | |
| 423 lo += inbuf[bigend ? 3 : 2]; | |
| 424 | |
| 425 if (lo < 0xDC00 || lo > 0xDFFF) | |
| 426 return EILSEQ; | |
| 427 | |
| 428 s = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000; | |
| 429 } | |
| 430 | |
| 431 rval = one_cppchar_to_utf8 (s, outbufp, outbytesleftp); | |
| 432 if (rval) | |
| 433 return rval; | |
| 434 | |
| 435 /* Success - update the input pointers (one_cppchar_to_utf8 has done | |
| 436 the output pointers for us). */ | |
| 437 if (s <= 0xFFFF) | |
| 438 { | |
| 439 *inbufp += 2; | |
| 440 *inbytesleftp -= 2; | |
| 441 } | |
| 442 else | |
| 443 { | |
| 444 *inbufp += 4; | |
| 445 *inbytesleftp -= 4; | |
| 446 } | |
| 447 return 0; | |
| 448 } | |
| 449 | |
| 450 /* Helper routine for the next few functions. The 'const' on | |
| 451 one_conversion means that we promise not to modify what function is | |
| 452 pointed to, which lets the inliner see through it. */ | |
| 453 | |
| 454 static inline bool | |
| 455 conversion_loop (int (*const one_conversion)(iconv_t, const uchar **, size_t *, | |
| 456 uchar **, size_t *), | |
| 457 iconv_t cd, const uchar *from, size_t flen, struct _cpp_strbuf *to) | |
| 458 { | |
| 459 const uchar *inbuf; | |
| 460 uchar *outbuf; | |
| 461 size_t inbytesleft, outbytesleft; | |
| 462 int rval; | |
| 463 | |
| 464 inbuf = from; | |
| 465 inbytesleft = flen; | |
| 466 outbuf = to->text + to->len; | |
| 467 outbytesleft = to->asize - to->len; | |
| 468 | |
| 469 for (;;) | |
| 470 { | |
| 471 do | |
| 472 rval = one_conversion (cd, &inbuf, &inbytesleft, | |
| 473 &outbuf, &outbytesleft); | |
| 474 while (inbytesleft && !rval); | |
| 475 | |
| 476 if (__builtin_expect (inbytesleft == 0, 1)) | |
| 477 { | |
| 478 to->len = to->asize - outbytesleft; | |
| 479 return true; | |
| 480 } | |
| 481 if (rval != E2BIG) | |
| 482 { | |
| 483 errno = rval; | |
| 484 return false; | |
| 485 } | |
| 486 | |
| 487 outbytesleft += OUTBUF_BLOCK_SIZE; | |
| 488 to->asize += OUTBUF_BLOCK_SIZE; | |
| 489 to->text = XRESIZEVEC (uchar, to->text, to->asize); | |
| 490 outbuf = to->text + to->asize - outbytesleft; | |
| 491 } | |
| 492 } | |
| 493 | |
| 494 | |
| 495 /* These functions convert entire strings between character sets. | |
| 496 They all have the signature | |
| 497 | |
| 498 bool (*)(iconv_t cd, const uchar *from, size_t flen, struct _cpp_strbuf *to); | |
| 499 | |
| 500 The input string FROM is converted as specified by the function | |
| 501 name plus the iconv descriptor CD (which may be fake), and the | |
| 502 result appended to TO. On any error, false is returned, otherwise true. */ | |
| 503 | |
| 504 /* These four use the custom conversion code above. */ | |
| 505 static bool | |
| 506 convert_utf8_utf16 (iconv_t cd, const uchar *from, size_t flen, | |
| 507 struct _cpp_strbuf *to) | |
| 508 { | |
| 509 return conversion_loop (one_utf8_to_utf16, cd, from, flen, to); | |
| 510 } | |
| 511 | |
| 512 static bool | |
| 513 convert_utf8_utf32 (iconv_t cd, const uchar *from, size_t flen, | |
| 514 struct _cpp_strbuf *to) | |
| 515 { | |
| 516 return conversion_loop (one_utf8_to_utf32, cd, from, flen, to); | |
| 517 } | |
| 518 | |
| 519 static bool | |
| 520 convert_utf16_utf8 (iconv_t cd, const uchar *from, size_t flen, | |
| 521 struct _cpp_strbuf *to) | |
| 522 { | |
| 523 return conversion_loop (one_utf16_to_utf8, cd, from, flen, to); | |
| 524 } | |
| 525 | |
| 526 static bool | |
| 527 convert_utf32_utf8 (iconv_t cd, const uchar *from, size_t flen, | |
| 528 struct _cpp_strbuf *to) | |
| 529 { | |
| 530 return conversion_loop (one_utf32_to_utf8, cd, from, flen, to); | |
| 531 } | |
| 532 | |
| 533 /* Identity conversion, used when we have no alternative. */ | |
| 534 static bool | |
| 535 convert_no_conversion (iconv_t cd ATTRIBUTE_UNUSED, | |
| 536 const uchar *from, size_t flen, struct _cpp_strbuf *to) | |
| 537 { | |
| 538 if (to->len + flen > to->asize) | |
| 539 { | |
| 540 to->asize = to->len + flen; | |
| 541 to->text = XRESIZEVEC (uchar, to->text, to->asize); | |
| 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. */ | |
| 550 #if HAVE_ICONV | |
| 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 | |
| 560 static bool | |
| 561 convert_using_iconv (iconv_t cd, const uchar *from, size_t flen, | |
| 562 struct _cpp_strbuf *to) | |
| 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 { | |
| 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 | |
| 593 to->len = to->asize - outbytesleft; | |
| 594 return true; | |
| 595 } | |
| 596 if (errno != E2BIG) | |
| 597 return false; | |
| 598 | |
| 599 CONVERT_ICONV_GROW_BUFFER; | |
| 600 } | |
| 601 } | |
| 602 #else | |
| 603 #define convert_using_iconv 0 /* prevent undefined symbol error below */ | |
| 604 #endif | |
| 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 | |
| 612 struct conversion | |
| 613 { | |
| 614 const char *pair; | |
| 615 convert_f func; | |
| 616 iconv_t fake_cd; | |
| 617 }; | |
| 618 static const struct conversion conversion_tab[] = { | |
| 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 | |
| 635 init_iconv_desc (cpp_reader *pfile, const char *to, const char *from) | |
| 636 { | |
| 637 struct cset_converter ret; | |
| 638 char *pair; | |
| 639 size_t i; | |
| 640 | |
| 641 if (!strcasecmp (to, from)) | |
| 642 { | |
| 643 ret.func = convert_no_conversion; | |
| 644 ret.cd = (iconv_t) -1; | |
| 645 ret.width = -1; | |
| 646 return ret; | |
| 647 } | |
| 648 | |
| 649 pair = (char *) alloca(strlen(to) + strlen(from) + 2); | |
| 650 | |
| 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; | |
| 659 ret.width = -1; | |
| 660 return ret; | |
| 661 } | |
| 662 | |
| 663 /* No custom converter - try iconv. */ | |
| 664 if (HAVE_ICONV) | |
| 665 { | |
| 666 ret.func = convert_using_iconv; | |
| 667 ret.cd = iconv_open (to, from); | |
| 668 ret.width = -1; | |
| 669 | |
| 670 if (ret.cd == (iconv_t) -1) | |
| 671 { | |
| 672 if (errno == EINVAL) | |
| 673 cpp_error (pfile, CPP_DL_ERROR, /* FIXME should be DL_SORRY */ | |
| 674 "conversion from %s to %s not supported by iconv", | |
| 675 from, to); | |
| 676 else | |
| 677 cpp_errno (pfile, CPP_DL_ERROR, "iconv_open"); | |
| 678 | |
| 679 ret.func = convert_no_conversion; | |
| 680 } | |
| 681 } | |
| 682 else | |
| 683 { | |
| 684 cpp_error (pfile, CPP_DL_ERROR, /* FIXME: should be DL_SORRY */ | |
| 685 "no iconv implementation, cannot convert from %s to %s", | |
| 686 from, to); | |
| 687 ret.func = convert_no_conversion; | |
| 688 ret.cd = (iconv_t) -1; | |
| 689 ret.width = -1; | |
| 690 } | |
| 691 return ret; | |
| 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) | |
| 709 default_wcset = be ? "UTF-32BE" : "UTF-32LE"; | |
| 710 else if (CPP_OPTION (pfile, wchar_precision) >= 16) | |
| 711 default_wcset = be ? "UTF-16BE" : "UTF-16LE"; | |
| 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 | |
| 717 if (!ncset) | |
| 718 ncset = SOURCE_CHARSET; | |
| 719 if (!wcset) | |
| 720 wcset = default_wcset; | |
| 721 | |
| 722 pfile->narrow_cset_desc = init_iconv_desc (pfile, ncset, SOURCE_CHARSET); | |
| 723 pfile->narrow_cset_desc.width = CPP_OPTION (pfile, char_precision); | |
|
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724 pfile->utf8_cset_desc = init_iconv_desc (pfile, "UTF-8", SOURCE_CHARSET); |
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725 pfile->utf8_cset_desc.width = CPP_OPTION (pfile, char_precision); |
| 0 | 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; | |
| 734 pfile->wide_cset_desc = init_iconv_desc (pfile, wcset, SOURCE_CHARSET); | |
| 735 pfile->wide_cset_desc.width = CPP_OPTION (pfile, wchar_precision); | |
| 736 } | |
| 737 | |
| 738 /* Destroy iconv(3) descriptors set up by cpp_init_iconv, if necessary. */ | |
| 739 void | |
| 740 _cpp_destroy_iconv (cpp_reader *pfile) | |
| 741 { | |
| 742 if (HAVE_ICONV) | |
| 743 { | |
| 744 if (pfile->narrow_cset_desc.func == convert_using_iconv) | |
| 745 iconv_close (pfile->narrow_cset_desc.cd); | |
|
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746 if (pfile->utf8_cset_desc.func == convert_using_iconv) |
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747 iconv_close (pfile->utf8_cset_desc.cd); |
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748 if (pfile->char16_cset_desc.func == convert_using_iconv) |
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749 iconv_close (pfile->char16_cset_desc.cd); |
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750 if (pfile->char32_cset_desc.func == convert_using_iconv) |
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751 iconv_close (pfile->char32_cset_desc.cd); |
| 0 | 752 if (pfile->wide_cset_desc.func == convert_using_iconv) |
| 753 iconv_close (pfile->wide_cset_desc.cd); | |
| 754 } | |
| 755 } | |
| 756 | |
| 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; | |
| 793 tbuf.text = XNEWVEC (uchar, tbuf.asize); | |
| 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 | |
| 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 | |
| 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? */ | |
| 832 DIG = 2, | |
| 833 /* Valid in a C++ identifier? */ | |
| 834 CXX = 4, | |
| 835 /* NFC representation is not valid in an identifier? */ | |
| 836 CID = 8, | |
| 837 /* Might be valid NFC form? */ | |
| 838 NFC = 16, | |
| 839 /* Might be valid NFKC form? */ | |
| 840 NKC = 32, | |
| 841 /* Certain preceding characters might make it not valid NFC/NKFC form? */ | |
| 842 CTX = 64 | |
| 843 }; | |
| 844 | |
| 845 static const struct { | |
| 846 /* Bitmap of flags above. */ | |
| 847 unsigned char flags; | |
| 848 /* Combining class of the character. */ | |
| 849 unsigned char combine; | |
| 850 /* Last character in the range described by this entry. */ | |
| 851 unsigned short end; | |
| 852 } ucnranges[] = { | |
| 853 #include "ucnid.h" | |
| 854 }; | |
| 855 | |
| 856 /* Returns 1 if C is valid in an identifier, 2 if C is valid except at | |
| 857 the start of an identifier, and 0 if C is not valid in an | |
| 858 identifier. We assume C has already gone through the checks of | |
| 859 _cpp_valid_ucn. Also update NST for C if returning nonzero. The | |
| 860 algorithm is a simple binary search on the table defined in | |
| 861 ucnid.h. */ | |
| 862 | |
| 863 static int | |
| 864 ucn_valid_in_identifier (cpp_reader *pfile, cppchar_t c, | |
| 865 struct normalize_state *nst) | |
| 866 { | |
| 867 int mn, mx, md; | |
| 868 | |
| 869 if (c > 0xFFFF) | |
| 870 return 0; | |
| 871 | |
| 872 mn = 0; | |
| 873 mx = ARRAY_SIZE (ucnranges) - 1; | |
| 874 while (mx != mn) | |
| 875 { | |
| 876 md = (mn + mx) / 2; | |
| 877 if (c <= ucnranges[md].end) | |
| 878 mx = md; | |
| 879 else | |
| 880 mn = md + 1; | |
| 881 } | |
| 882 | |
| 883 /* When -pedantic, we require the character to have been listed by | |
| 884 the standard for the current language. Otherwise, we accept the | |
| 885 union of the acceptable sets for C++98 and C99. */ | |
| 886 if (! (ucnranges[mn].flags & (C99 | CXX))) | |
| 887 return 0; | |
| 888 | |
| 889 if (CPP_PEDANTIC (pfile) | |
| 890 && ((CPP_OPTION (pfile, c99) && !(ucnranges[mn].flags & C99)) | |
| 891 || (CPP_OPTION (pfile, cplusplus) | |
| 892 && !(ucnranges[mn].flags & CXX)))) | |
| 893 return 0; | |
| 894 | |
| 895 /* Update NST. */ | |
| 896 if (ucnranges[mn].combine != 0 && ucnranges[mn].combine < nst->prev_class) | |
| 897 nst->level = normalized_none; | |
| 898 else if (ucnranges[mn].flags & CTX) | |
| 899 { | |
| 900 bool safe; | |
| 901 cppchar_t p = nst->previous; | |
| 902 | |
| 903 /* Easy cases from Bengali, Oriya, Tamil, Jannada, and Malayalam. */ | |
| 904 if (c == 0x09BE) | |
| 905 safe = p != 0x09C7; /* Use 09CB instead of 09C7 09BE. */ | |
| 906 else if (c == 0x0B3E) | |
| 907 safe = p != 0x0B47; /* Use 0B4B instead of 0B47 0B3E. */ | |
| 908 else if (c == 0x0BBE) | |
| 909 safe = p != 0x0BC6 && p != 0x0BC7; /* Use 0BCA/0BCB instead. */ | |
| 910 else if (c == 0x0CC2) | |
| 911 safe = p != 0x0CC6; /* Use 0CCA instead of 0CC6 0CC2. */ | |
| 912 else if (c == 0x0D3E) | |
| 913 safe = p != 0x0D46 && p != 0x0D47; /* Use 0D4A/0D4B instead. */ | |
| 914 /* For Hangul, characters in the range AC00-D7A3 are NFC/NFKC, | |
| 915 and are combined algorithmically from a sequence of the form | |
| 916 1100-1112 1161-1175 11A8-11C2 | |
| 917 (if the third is not present, it is treated as 11A7, which is not | |
| 918 really a valid character). | |
| 919 Unfortunately, C99 allows (only) the NFC form, but C++ allows | |
| 920 only the combining characters. */ | |
| 921 else if (c >= 0x1161 && c <= 0x1175) | |
| 922 safe = p < 0x1100 || p > 0x1112; | |
| 923 else if (c >= 0x11A8 && c <= 0x11C2) | |
| 924 safe = (p < 0xAC00 || p > 0xD7A3 || (p - 0xAC00) % 28 != 0); | |
| 925 else | |
| 926 { | |
| 927 /* Uh-oh, someone updated ucnid.h without updating this code. */ | |
| 928 cpp_error (pfile, CPP_DL_ICE, "Character %x might not be NFKC", c); | |
| 929 safe = true; | |
| 930 } | |
| 931 if (!safe && c < 0x1161) | |
| 932 nst->level = normalized_none; | |
| 933 else if (!safe) | |
| 934 nst->level = MAX (nst->level, normalized_identifier_C); | |
| 935 } | |
| 936 else if (ucnranges[mn].flags & NKC) | |
| 937 ; | |
| 938 else if (ucnranges[mn].flags & NFC) | |
| 939 nst->level = MAX (nst->level, normalized_C); | |
| 940 else if (ucnranges[mn].flags & CID) | |
| 941 nst->level = MAX (nst->level, normalized_identifier_C); | |
| 942 else | |
| 943 nst->level = normalized_none; | |
| 944 nst->previous = c; | |
| 945 nst->prev_class = ucnranges[mn].combine; | |
| 946 | |
| 947 /* In C99, UCN digits may not begin identifiers. */ | |
| 948 if (CPP_OPTION (pfile, c99) && (ucnranges[mn].flags & DIG)) | |
| 949 return 2; | |
| 950 | |
| 951 return 1; | |
| 952 } | |
| 953 | |
| 954 /* [lex.charset]: The character designated by the universal character | |
| 955 name \UNNNNNNNN is that character whose character short name in | |
| 956 ISO/IEC 10646 is NNNNNNNN; the character designated by the | |
| 957 universal character name \uNNNN is that character whose character | |
| 958 short name in ISO/IEC 10646 is 0000NNNN. If the hexadecimal value | |
|
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959 for a universal character name corresponds to a surrogate code point |
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960 (in the range 0xD800-0xDFFF, inclusive), the program is ill-formed. |
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961 Additionally, if the hexadecimal value for a universal-character-name |
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962 outside a character or string literal corresponds to a control character |
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963 (in either of the ranges 0x00-0x1F or 0x7F-0x9F, both inclusive) or to a |
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964 character in the basic source character set, the program is ill-formed. |
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965 |
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966 C99 6.4.3: A universal character name shall not specify a character |
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967 whose short identifier is less than 00A0 other than 0024 ($), 0040 (@), |
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968 or 0060 (`), nor one in the range D800 through DFFF inclusive. |
| 0 | 969 |
| 970 *PSTR must be preceded by "\u" or "\U"; it is assumed that the | |
| 971 buffer end is delimited by a non-hex digit. Returns zero if the | |
| 972 UCN has not been consumed. | |
| 973 | |
| 974 Otherwise the nonzero value of the UCN, whether valid or invalid, | |
| 975 is returned. Diagnostics are emitted for invalid values. PSTR | |
| 976 is updated to point one beyond the UCN, or to the syntactically | |
| 977 invalid character. | |
| 978 | |
| 979 IDENTIFIER_POS is 0 when not in an identifier, 1 for the start of | |
| 980 an identifier, or 2 otherwise. */ | |
| 981 | |
| 982 cppchar_t | |
| 983 _cpp_valid_ucn (cpp_reader *pfile, const uchar **pstr, | |
| 984 const uchar *limit, int identifier_pos, | |
| 985 struct normalize_state *nst) | |
| 986 { | |
| 987 cppchar_t result, c; | |
| 988 unsigned int length; | |
| 989 const uchar *str = *pstr; | |
| 990 const uchar *base = str - 2; | |
| 991 | |
| 992 if (!CPP_OPTION (pfile, cplusplus) && !CPP_OPTION (pfile, c99)) | |
| 993 cpp_error (pfile, CPP_DL_WARNING, | |
| 994 "universal character names are only valid in C++ and C99"); | |
| 995 else if (CPP_WTRADITIONAL (pfile) && identifier_pos == 0) | |
|
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996 cpp_warning (pfile, CPP_W_TRADITIONAL, |
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997 "the meaning of '\\%c' is different in traditional C", |
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998 (int) str[-1]); |
| 0 | 999 |
| 1000 if (str[-1] == 'u') | |
| 1001 length = 4; | |
| 1002 else if (str[-1] == 'U') | |
| 1003 length = 8; | |
| 1004 else | |
| 1005 { | |
| 1006 cpp_error (pfile, CPP_DL_ICE, "In _cpp_valid_ucn but not a UCN"); | |
| 1007 length = 4; | |
| 1008 } | |
| 1009 | |
| 1010 result = 0; | |
| 1011 do | |
| 1012 { | |
| 1013 c = *str; | |
| 1014 if (!ISXDIGIT (c)) | |
| 1015 break; | |
| 1016 str++; | |
| 1017 result = (result << 4) + hex_value (c); | |
| 1018 } | |
| 1019 while (--length && str < limit); | |
| 1020 | |
| 1021 /* Partial UCNs are not valid in strings, but decompose into | |
| 1022 multiple tokens in identifiers, so we can't give a helpful | |
| 1023 error message in that case. */ | |
| 1024 if (length && identifier_pos) | |
| 1025 return 0; | |
| 1026 | |
| 1027 *pstr = str; | |
| 1028 if (length) | |
| 1029 { | |
| 1030 cpp_error (pfile, CPP_DL_ERROR, | |
| 1031 "incomplete universal character name %.*s", | |
| 1032 (int) (str - base), base); | |
| 1033 result = 1; | |
| 1034 } | |
|
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1035 /* The C99 standard permits $, @ and ` to be specified as UCNs. We use |
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1036 hex escapes so that this also works with EBCDIC hosts. |
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1037 C++0x permits everything below 0xa0 within literals; |
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1038 ucn_valid_in_identifier will complain about identifiers. */ |
| 0 | 1039 else if ((result < 0xa0 |
|
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1040 && !CPP_OPTION (pfile, cplusplus) |
| 0 | 1041 && (result != 0x24 && result != 0x40 && result != 0x60)) |
| 1042 || (result & 0x80000000) | |
| 1043 || (result >= 0xD800 && result <= 0xDFFF)) | |
| 1044 { | |
| 1045 cpp_error (pfile, CPP_DL_ERROR, | |
| 1046 "%.*s is not a valid universal character", | |
| 1047 (int) (str - base), base); | |
| 1048 result = 1; | |
| 1049 } | |
| 1050 else if (identifier_pos && result == 0x24 | |
| 1051 && CPP_OPTION (pfile, dollars_in_ident)) | |
| 1052 { | |
| 1053 if (CPP_OPTION (pfile, warn_dollars) && !pfile->state.skipping) | |
| 1054 { | |
| 1055 CPP_OPTION (pfile, warn_dollars) = 0; | |
| 1056 cpp_error (pfile, CPP_DL_PEDWARN, "'$' in identifier or number"); | |
| 1057 } | |
| 1058 NORMALIZE_STATE_UPDATE_IDNUM (nst); | |
| 1059 } | |
| 1060 else if (identifier_pos) | |
| 1061 { | |
| 1062 int validity = ucn_valid_in_identifier (pfile, result, nst); | |
| 1063 | |
| 1064 if (validity == 0) | |
| 1065 cpp_error (pfile, CPP_DL_ERROR, | |
| 1066 "universal character %.*s is not valid in an identifier", | |
| 1067 (int) (str - base), base); | |
| 1068 else if (validity == 2 && identifier_pos == 1) | |
| 1069 cpp_error (pfile, CPP_DL_ERROR, | |
| 1070 "universal character %.*s is not valid at the start of an identifier", | |
| 1071 (int) (str - base), base); | |
| 1072 } | |
| 1073 | |
| 1074 if (result == 0) | |
| 1075 result = 1; | |
| 1076 | |
| 1077 return result; | |
| 1078 } | |
| 1079 | |
| 1080 /* Convert an UCN, pointed to by FROM, to UTF-8 encoding, then translate | |
| 1081 it to the execution character set and write the result into TBUF. | |
| 1082 An advanced pointer is returned. Issues all relevant diagnostics. */ | |
| 1083 static const uchar * | |
| 1084 convert_ucn (cpp_reader *pfile, const uchar *from, const uchar *limit, | |
| 1085 struct _cpp_strbuf *tbuf, struct cset_converter cvt) | |
| 1086 { | |
| 1087 cppchar_t ucn; | |
| 1088 uchar buf[6]; | |
| 1089 uchar *bufp = buf; | |
| 1090 size_t bytesleft = 6; | |
| 1091 int rval; | |
| 1092 struct normalize_state nst = INITIAL_NORMALIZE_STATE; | |
| 1093 | |
| 1094 from++; /* Skip u/U. */ | |
| 1095 ucn = _cpp_valid_ucn (pfile, &from, limit, 0, &nst); | |
| 1096 | |
| 1097 rval = one_cppchar_to_utf8 (ucn, &bufp, &bytesleft); | |
| 1098 if (rval) | |
| 1099 { | |
| 1100 errno = rval; | |
| 1101 cpp_errno (pfile, CPP_DL_ERROR, | |
| 1102 "converting UCN to source character set"); | |
| 1103 } | |
| 1104 else if (!APPLY_CONVERSION (cvt, buf, 6 - bytesleft, tbuf)) | |
| 1105 cpp_errno (pfile, CPP_DL_ERROR, | |
| 1106 "converting UCN to execution character set"); | |
| 1107 | |
| 1108 return from; | |
| 1109 } | |
| 1110 | |
| 1111 /* Subroutine of convert_hex and convert_oct. N is the representation | |
| 1112 in the execution character set of a numeric escape; write it into the | |
| 1113 string buffer TBUF and update the end-of-string pointer therein. WIDE | |
| 1114 is true if it's a wide string that's being assembled in TBUF. This | |
| 1115 function issues no diagnostics and never fails. */ | |
| 1116 static void | |
| 1117 emit_numeric_escape (cpp_reader *pfile, cppchar_t n, | |
| 1118 struct _cpp_strbuf *tbuf, struct cset_converter cvt) | |
| 1119 { | |
| 1120 size_t width = cvt.width; | |
| 1121 | |
| 1122 if (width != CPP_OPTION (pfile, char_precision)) | |
| 1123 { | |
| 1124 /* We have to render this into the target byte order, which may not | |
| 1125 be our byte order. */ | |
| 1126 bool bigend = CPP_OPTION (pfile, bytes_big_endian); | |
| 1127 size_t cwidth = CPP_OPTION (pfile, char_precision); | |
| 1128 size_t cmask = width_to_mask (cwidth); | |
| 1129 size_t nbwc = width / cwidth; | |
| 1130 size_t i; | |
| 1131 size_t off = tbuf->len; | |
| 1132 cppchar_t c; | |
| 1133 | |
| 1134 if (tbuf->len + nbwc > tbuf->asize) | |
| 1135 { | |
| 1136 tbuf->asize += OUTBUF_BLOCK_SIZE; | |
| 1137 tbuf->text = XRESIZEVEC (uchar, tbuf->text, tbuf->asize); | |
| 1138 } | |
| 1139 | |
| 1140 for (i = 0; i < nbwc; i++) | |
| 1141 { | |
| 1142 c = n & cmask; | |
| 1143 n >>= cwidth; | |
| 1144 tbuf->text[off + (bigend ? nbwc - i - 1 : i)] = c; | |
| 1145 } | |
| 1146 tbuf->len += nbwc; | |
| 1147 } | |
| 1148 else | |
| 1149 { | |
| 1150 /* Note: this code does not handle the case where the target | |
| 1151 and host have a different number of bits in a byte. */ | |
| 1152 if (tbuf->len + 1 > tbuf->asize) | |
| 1153 { | |
| 1154 tbuf->asize += OUTBUF_BLOCK_SIZE; | |
| 1155 tbuf->text = XRESIZEVEC (uchar, tbuf->text, tbuf->asize); | |
| 1156 } | |
| 1157 tbuf->text[tbuf->len++] = n; | |
| 1158 } | |
| 1159 } | |
| 1160 | |
| 1161 /* Convert a hexadecimal escape, pointed to by FROM, to the execution | |
| 1162 character set and write it into the string buffer TBUF. Returns an | |
| 1163 advanced pointer, and issues diagnostics as necessary. | |
| 1164 No character set translation occurs; this routine always produces the | |
| 1165 execution-set character with numeric value equal to the given hex | |
| 1166 number. You can, e.g. generate surrogate pairs this way. */ | |
| 1167 static const uchar * | |
| 1168 convert_hex (cpp_reader *pfile, const uchar *from, const uchar *limit, | |
| 1169 struct _cpp_strbuf *tbuf, struct cset_converter cvt) | |
| 1170 { | |
| 1171 cppchar_t c, n = 0, overflow = 0; | |
| 1172 int digits_found = 0; | |
| 1173 size_t width = cvt.width; | |
| 1174 size_t mask = width_to_mask (width); | |
| 1175 | |
| 1176 if (CPP_WTRADITIONAL (pfile)) | |
|
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1177 cpp_warning (pfile, CPP_W_TRADITIONAL, |
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1178 "the meaning of '\\x' is different in traditional C"); |
| 0 | 1179 |
| 1180 from++; /* Skip 'x'. */ | |
| 1181 while (from < limit) | |
| 1182 { | |
| 1183 c = *from; | |
| 1184 if (! hex_p (c)) | |
| 1185 break; | |
| 1186 from++; | |
| 1187 overflow |= n ^ (n << 4 >> 4); | |
| 1188 n = (n << 4) + hex_value (c); | |
| 1189 digits_found = 1; | |
| 1190 } | |
| 1191 | |
| 1192 if (!digits_found) | |
| 1193 { | |
| 1194 cpp_error (pfile, CPP_DL_ERROR, | |
| 1195 "\\x used with no following hex digits"); | |
| 1196 return from; | |
| 1197 } | |
| 1198 | |
| 1199 if (overflow | (n != (n & mask))) | |
| 1200 { | |
| 1201 cpp_error (pfile, CPP_DL_PEDWARN, | |
| 1202 "hex escape sequence out of range"); | |
| 1203 n &= mask; | |
| 1204 } | |
| 1205 | |
| 1206 emit_numeric_escape (pfile, n, tbuf, cvt); | |
| 1207 | |
| 1208 return from; | |
| 1209 } | |
| 1210 | |
| 1211 /* Convert an octal escape, pointed to by FROM, to the execution | |
| 1212 character set and write it into the string buffer TBUF. Returns an | |
| 1213 advanced pointer, and issues diagnostics as necessary. | |
| 1214 No character set translation occurs; this routine always produces the | |
| 1215 execution-set character with numeric value equal to the given octal | |
| 1216 number. */ | |
| 1217 static const uchar * | |
| 1218 convert_oct (cpp_reader *pfile, const uchar *from, const uchar *limit, | |
| 1219 struct _cpp_strbuf *tbuf, struct cset_converter cvt) | |
| 1220 { | |
| 1221 size_t count = 0; | |
| 1222 cppchar_t c, n = 0; | |
| 1223 size_t width = cvt.width; | |
| 1224 size_t mask = width_to_mask (width); | |
| 1225 bool overflow = false; | |
| 1226 | |
| 1227 while (from < limit && count++ < 3) | |
| 1228 { | |
| 1229 c = *from; | |
| 1230 if (c < '0' || c > '7') | |
| 1231 break; | |
| 1232 from++; | |
| 1233 overflow |= n ^ (n << 3 >> 3); | |
| 1234 n = (n << 3) + c - '0'; | |
| 1235 } | |
| 1236 | |
| 1237 if (n != (n & mask)) | |
| 1238 { | |
| 1239 cpp_error (pfile, CPP_DL_PEDWARN, | |
| 1240 "octal escape sequence out of range"); | |
| 1241 n &= mask; | |
| 1242 } | |
| 1243 | |
| 1244 emit_numeric_escape (pfile, n, tbuf, cvt); | |
| 1245 | |
| 1246 return from; | |
| 1247 } | |
| 1248 | |
| 1249 /* Convert an escape sequence (pointed to by FROM) to its value on | |
| 1250 the target, and to the execution character set. Do not scan past | |
| 1251 LIMIT. Write the converted value into TBUF. Returns an advanced | |
| 1252 pointer. Handles all relevant diagnostics. */ | |
| 1253 static const uchar * | |
| 1254 convert_escape (cpp_reader *pfile, const uchar *from, const uchar *limit, | |
| 1255 struct _cpp_strbuf *tbuf, struct cset_converter cvt) | |
| 1256 { | |
| 1257 /* Values of \a \b \e \f \n \r \t \v respectively. */ | |
| 1258 #if HOST_CHARSET == HOST_CHARSET_ASCII | |
| 1259 static const uchar charconsts[] = { 7, 8, 27, 12, 10, 13, 9, 11 }; | |
| 1260 #elif HOST_CHARSET == HOST_CHARSET_EBCDIC | |
| 1261 static const uchar charconsts[] = { 47, 22, 39, 12, 21, 13, 5, 11 }; | |
| 1262 #else | |
| 1263 #error "unknown host character set" | |
| 1264 #endif | |
| 1265 | |
| 1266 uchar c; | |
| 1267 | |
| 1268 c = *from; | |
| 1269 switch (c) | |
| 1270 { | |
| 1271 /* UCNs, hex escapes, and octal escapes are processed separately. */ | |
| 1272 case 'u': case 'U': | |
| 1273 return convert_ucn (pfile, from, limit, tbuf, cvt); | |
| 1274 | |
| 1275 case 'x': | |
| 1276 return convert_hex (pfile, from, limit, tbuf, cvt); | |
| 1277 break; | |
| 1278 | |
| 1279 case '0': case '1': case '2': case '3': | |
| 1280 case '4': case '5': case '6': case '7': | |
| 1281 return convert_oct (pfile, from, limit, tbuf, cvt); | |
| 1282 | |
| 1283 /* Various letter escapes. Get the appropriate host-charset | |
| 1284 value into C. */ | |
| 1285 case '\\': case '\'': case '"': case '?': break; | |
| 1286 | |
| 1287 case '(': case '{': case '[': case '%': | |
| 1288 /* '\(', etc, can be used at the beginning of a line in a long | |
| 1289 string split onto multiple lines with \-newline, to prevent | |
| 1290 Emacs or other text editors from getting confused. '\%' can | |
| 1291 be used to prevent SCCS from mangling printf format strings. */ | |
| 1292 if (CPP_PEDANTIC (pfile)) | |
| 1293 goto unknown; | |
| 1294 break; | |
| 1295 | |
| 1296 case 'b': c = charconsts[1]; break; | |
| 1297 case 'f': c = charconsts[3]; break; | |
| 1298 case 'n': c = charconsts[4]; break; | |
| 1299 case 'r': c = charconsts[5]; break; | |
| 1300 case 't': c = charconsts[6]; break; | |
| 1301 case 'v': c = charconsts[7]; break; | |
| 1302 | |
| 1303 case 'a': | |
| 1304 if (CPP_WTRADITIONAL (pfile)) | |
|
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1305 cpp_warning (pfile, CPP_W_TRADITIONAL, |
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1306 "the meaning of '\\a' is different in traditional C"); |
| 0 | 1307 c = charconsts[0]; |
| 1308 break; | |
| 1309 | |
| 1310 case 'e': case 'E': | |
| 1311 if (CPP_PEDANTIC (pfile)) | |
| 1312 cpp_error (pfile, CPP_DL_PEDWARN, | |
| 1313 "non-ISO-standard escape sequence, '\\%c'", (int) c); | |
| 1314 c = charconsts[2]; | |
| 1315 break; | |
| 1316 | |
| 1317 default: | |
| 1318 unknown: | |
| 1319 if (ISGRAPH (c)) | |
| 1320 cpp_error (pfile, CPP_DL_PEDWARN, | |
|
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1321 "unknown escape sequence: '\\%c'", (int) c); |
| 0 | 1322 else |
| 1323 { | |
| 1324 /* diagnostic.c does not support "%03o". When it does, this | |
| 1325 code can use %03o directly in the diagnostic again. */ | |
| 1326 char buf[32]; | |
| 1327 sprintf(buf, "%03o", (int) c); | |
| 1328 cpp_error (pfile, CPP_DL_PEDWARN, | |
| 1329 "unknown escape sequence: '\\%s'", buf); | |
| 1330 } | |
| 1331 } | |
| 1332 | |
| 1333 /* Now convert what we have to the execution character set. */ | |
| 1334 if (!APPLY_CONVERSION (cvt, &c, 1, tbuf)) | |
| 1335 cpp_errno (pfile, CPP_DL_ERROR, | |
| 1336 "converting escape sequence to execution character set"); | |
| 1337 | |
| 1338 return from + 1; | |
| 1339 } | |
| 1340 | |
| 1341 /* TYPE is a token type. The return value is the conversion needed to | |
| 1342 convert from source to execution character set for the given type. */ | |
| 1343 static struct cset_converter | |
| 1344 converter_for_type (cpp_reader *pfile, enum cpp_ttype type) | |
| 1345 { | |
| 1346 switch (type) | |
| 1347 { | |
| 1348 default: | |
| 1349 return pfile->narrow_cset_desc; | |
|
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1350 case CPP_UTF8STRING: |
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1351 return pfile->utf8_cset_desc; |
| 0 | 1352 case CPP_CHAR16: |
| 1353 case CPP_STRING16: | |
| 1354 return pfile->char16_cset_desc; | |
| 1355 case CPP_CHAR32: | |
| 1356 case CPP_STRING32: | |
| 1357 return pfile->char32_cset_desc; | |
| 1358 case CPP_WCHAR: | |
| 1359 case CPP_WSTRING: | |
| 1360 return pfile->wide_cset_desc; | |
| 1361 } | |
| 1362 } | |
| 1363 | |
| 1364 /* FROM is an array of cpp_string structures of length COUNT. These | |
| 1365 are to be converted from the source to the execution character set, | |
| 1366 escape sequences translated, and finally all are to be | |
| 1367 concatenated. WIDE indicates whether or not to produce a wide | |
| 1368 string. The result is written into TO. Returns true for success, | |
| 1369 false for failure. */ | |
| 1370 bool | |
| 1371 cpp_interpret_string (cpp_reader *pfile, const cpp_string *from, size_t count, | |
| 1372 cpp_string *to, enum cpp_ttype type) | |
| 1373 { | |
| 1374 struct _cpp_strbuf tbuf; | |
| 1375 const uchar *p, *base, *limit; | |
| 1376 size_t i; | |
| 1377 struct cset_converter cvt = converter_for_type (pfile, type); | |
| 1378 | |
| 1379 tbuf.asize = MAX (OUTBUF_BLOCK_SIZE, from->len); | |
| 1380 tbuf.text = XNEWVEC (uchar, tbuf.asize); | |
| 1381 tbuf.len = 0; | |
| 1382 | |
| 1383 for (i = 0; i < count; i++) | |
| 1384 { | |
| 1385 p = from[i].text; | |
|
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1386 if (*p == 'u') |
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1387 { |
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1388 if (*++p == '8') |
|
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1389 p++; |
|
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1390 } |
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1391 else if (*p == 'L' || *p == 'U') p++; |
|
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1392 if (*p == 'R') |
|
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1393 { |
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|
1394 const uchar *prefix; |
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1395 |
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1396 /* Skip over 'R"'. */ |
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1397 p += 2; |
|
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1398 prefix = p; |
|
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1399 while (*p != '(') |
|
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1400 p++; |
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1401 p++; |
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1402 limit = from[i].text + from[i].len; |
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1403 if (limit >= p + (p - prefix) + 1) |
|
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1404 limit -= (p - prefix) + 1; |
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1405 |
|
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1406 /* Raw strings are all normal characters; these can be fed |
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1407 directly to convert_cset. */ |
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1408 if (!APPLY_CONVERSION (cvt, p, limit - p, &tbuf)) |
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1409 goto fail; |
|
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1410 |
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1411 continue; |
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|
1412 } |
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|
1413 |
| 0 | 1414 p++; /* Skip leading quote. */ |
| 1415 limit = from[i].text + from[i].len - 1; /* Skip trailing quote. */ | |
| 1416 | |
| 1417 for (;;) | |
| 1418 { | |
| 1419 base = p; | |
| 1420 while (p < limit && *p != '\\') | |
| 1421 p++; | |
| 1422 if (p > base) | |
| 1423 { | |
| 1424 /* We have a run of normal characters; these can be fed | |
| 1425 directly to convert_cset. */ | |
| 1426 if (!APPLY_CONVERSION (cvt, base, p - base, &tbuf)) | |
| 1427 goto fail; | |
| 1428 } | |
| 1429 if (p == limit) | |
| 1430 break; | |
| 1431 | |
| 1432 p = convert_escape (pfile, p + 1, limit, &tbuf, cvt); | |
| 1433 } | |
| 1434 } | |
| 1435 /* NUL-terminate the 'to' buffer and translate it to a cpp_string | |
| 1436 structure. */ | |
| 1437 emit_numeric_escape (pfile, 0, &tbuf, cvt); | |
| 1438 tbuf.text = XRESIZEVEC (uchar, tbuf.text, tbuf.len); | |
| 1439 to->text = tbuf.text; | |
| 1440 to->len = tbuf.len; | |
| 1441 return true; | |
| 1442 | |
| 1443 fail: | |
| 1444 cpp_errno (pfile, CPP_DL_ERROR, "converting to execution character set"); | |
| 1445 free (tbuf.text); | |
| 1446 return false; | |
| 1447 } | |
| 1448 | |
| 1449 /* Subroutine of do_line and do_linemarker. Convert escape sequences | |
| 1450 in a string, but do not perform character set conversion. */ | |
| 1451 bool | |
| 1452 cpp_interpret_string_notranslate (cpp_reader *pfile, const cpp_string *from, | |
| 1453 size_t count, cpp_string *to, | |
| 1454 enum cpp_ttype type ATTRIBUTE_UNUSED) | |
| 1455 { | |
| 1456 struct cset_converter save_narrow_cset_desc = pfile->narrow_cset_desc; | |
| 1457 bool retval; | |
| 1458 | |
| 1459 pfile->narrow_cset_desc.func = convert_no_conversion; | |
| 1460 pfile->narrow_cset_desc.cd = (iconv_t) -1; | |
| 1461 pfile->narrow_cset_desc.width = CPP_OPTION (pfile, char_precision); | |
| 1462 | |
| 1463 retval = cpp_interpret_string (pfile, from, count, to, CPP_STRING); | |
| 1464 | |
| 1465 pfile->narrow_cset_desc = save_narrow_cset_desc; | |
| 1466 return retval; | |
| 1467 } | |
| 1468 | |
| 1469 | |
| 1470 /* Subroutine of cpp_interpret_charconst which performs the conversion | |
| 1471 to a number, for narrow strings. STR is the string structure returned | |
| 1472 by cpp_interpret_string. PCHARS_SEEN and UNSIGNEDP are as for | |
| 1473 cpp_interpret_charconst. */ | |
| 1474 static cppchar_t | |
| 1475 narrow_str_to_charconst (cpp_reader *pfile, cpp_string str, | |
| 1476 unsigned int *pchars_seen, int *unsignedp) | |
| 1477 { | |
| 1478 size_t width = CPP_OPTION (pfile, char_precision); | |
| 1479 size_t max_chars = CPP_OPTION (pfile, int_precision) / width; | |
| 1480 size_t mask = width_to_mask (width); | |
| 1481 size_t i; | |
| 1482 cppchar_t result, c; | |
| 1483 bool unsigned_p; | |
| 1484 | |
| 1485 /* The value of a multi-character character constant, or a | |
| 1486 single-character character constant whose representation in the | |
| 1487 execution character set is more than one byte long, is | |
| 1488 implementation defined. This implementation defines it to be the | |
| 1489 number formed by interpreting the byte sequence in memory as a | |
| 1490 big-endian binary number. If overflow occurs, the high bytes are | |
| 1491 lost, and a warning is issued. | |
| 1492 | |
| 1493 We don't want to process the NUL terminator handed back by | |
| 1494 cpp_interpret_string. */ | |
| 1495 result = 0; | |
| 1496 for (i = 0; i < str.len - 1; i++) | |
| 1497 { | |
| 1498 c = str.text[i] & mask; | |
| 1499 if (width < BITS_PER_CPPCHAR_T) | |
| 1500 result = (result << width) | c; | |
| 1501 else | |
| 1502 result = c; | |
| 1503 } | |
| 1504 | |
| 1505 if (i > max_chars) | |
| 1506 { | |
| 1507 i = max_chars; | |
| 1508 cpp_error (pfile, CPP_DL_WARNING, | |
| 1509 "character constant too long for its type"); | |
| 1510 } | |
| 1511 else if (i > 1 && CPP_OPTION (pfile, warn_multichar)) | |
|
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|
1512 cpp_warning (pfile, CPP_W_MULTICHAR, "multi-character character constant"); |
| 0 | 1513 |
| 1514 /* Multichar constants are of type int and therefore signed. */ | |
| 1515 if (i > 1) | |
| 1516 unsigned_p = 0; | |
| 1517 else | |
| 1518 unsigned_p = CPP_OPTION (pfile, unsigned_char); | |
| 1519 | |
| 1520 /* Truncate the constant to its natural width, and simultaneously | |
| 1521 sign- or zero-extend to the full width of cppchar_t. | |
| 1522 For single-character constants, the value is WIDTH bits wide. | |
| 1523 For multi-character constants, the value is INT_PRECISION bits wide. */ | |
| 1524 if (i > 1) | |
| 1525 width = CPP_OPTION (pfile, int_precision); | |
| 1526 if (width < BITS_PER_CPPCHAR_T) | |
| 1527 { | |
| 1528 mask = ((cppchar_t) 1 << width) - 1; | |
| 1529 if (unsigned_p || !(result & (1 << (width - 1)))) | |
| 1530 result &= mask; | |
| 1531 else | |
| 1532 result |= ~mask; | |
| 1533 } | |
| 1534 *pchars_seen = i; | |
| 1535 *unsignedp = unsigned_p; | |
| 1536 return result; | |
| 1537 } | |
| 1538 | |
| 1539 /* Subroutine of cpp_interpret_charconst which performs the conversion | |
| 1540 to a number, for wide strings. STR is the string structure returned | |
| 1541 by cpp_interpret_string. PCHARS_SEEN and UNSIGNEDP are as for | |
| 1542 cpp_interpret_charconst. TYPE is the token type. */ | |
| 1543 static cppchar_t | |
| 1544 wide_str_to_charconst (cpp_reader *pfile, cpp_string str, | |
| 1545 unsigned int *pchars_seen, int *unsignedp, | |
| 1546 enum cpp_ttype type) | |
| 1547 { | |
| 1548 bool bigend = CPP_OPTION (pfile, bytes_big_endian); | |
| 1549 size_t width = converter_for_type (pfile, type).width; | |
| 1550 size_t cwidth = CPP_OPTION (pfile, char_precision); | |
| 1551 size_t mask = width_to_mask (width); | |
| 1552 size_t cmask = width_to_mask (cwidth); | |
| 1553 size_t nbwc = width / cwidth; | |
| 1554 size_t off, i; | |
| 1555 cppchar_t result = 0, c; | |
| 1556 | |
| 1557 /* This is finicky because the string is in the target's byte order, | |
| 1558 which may not be our byte order. Only the last character, ignoring | |
| 1559 the NUL terminator, is relevant. */ | |
| 1560 off = str.len - (nbwc * 2); | |
| 1561 result = 0; | |
| 1562 for (i = 0; i < nbwc; i++) | |
| 1563 { | |
| 1564 c = bigend ? str.text[off + i] : str.text[off + nbwc - i - 1]; | |
| 1565 result = (result << cwidth) | (c & cmask); | |
| 1566 } | |
| 1567 | |
| 1568 /* Wide character constants have type wchar_t, and a single | |
| 1569 character exactly fills a wchar_t, so a multi-character wide | |
| 1570 character constant is guaranteed to overflow. */ | |
| 1571 if (str.len > nbwc * 2) | |
| 1572 cpp_error (pfile, CPP_DL_WARNING, | |
| 1573 "character constant too long for its type"); | |
| 1574 | |
| 1575 /* Truncate the constant to its natural width, and simultaneously | |
| 1576 sign- or zero-extend to the full width of cppchar_t. */ | |
| 1577 if (width < BITS_PER_CPPCHAR_T) | |
| 1578 { | |
| 1579 if (type == CPP_CHAR16 || type == CPP_CHAR32 | |
| 1580 || CPP_OPTION (pfile, unsigned_wchar) | |
| 1581 || !(result & (1 << (width - 1)))) | |
| 1582 result &= mask; | |
| 1583 else | |
| 1584 result |= ~mask; | |
| 1585 } | |
| 1586 | |
| 1587 if (type == CPP_CHAR16 || type == CPP_CHAR32 | |
| 1588 || CPP_OPTION (pfile, unsigned_wchar)) | |
| 1589 *unsignedp = 1; | |
| 1590 else | |
| 1591 *unsignedp = 0; | |
| 1592 | |
| 1593 *pchars_seen = 1; | |
| 1594 return result; | |
| 1595 } | |
| 1596 | |
| 1597 /* Interpret a (possibly wide) character constant in TOKEN. | |
| 1598 PCHARS_SEEN points to a variable that is filled in with the number | |
| 1599 of characters seen, and UNSIGNEDP to a variable that indicates | |
| 1600 whether the result has signed type. */ | |
| 1601 cppchar_t | |
| 1602 cpp_interpret_charconst (cpp_reader *pfile, const cpp_token *token, | |
| 1603 unsigned int *pchars_seen, int *unsignedp) | |
| 1604 { | |
| 1605 cpp_string str = { 0, 0 }; | |
| 1606 bool wide = (token->type != CPP_CHAR); | |
| 1607 cppchar_t result; | |
| 1608 | |
| 1609 /* an empty constant will appear as L'', u'', U'' or '' */ | |
| 1610 if (token->val.str.len == (size_t) (2 + wide)) | |
| 1611 { | |
| 1612 cpp_error (pfile, CPP_DL_ERROR, "empty character constant"); | |
| 1613 return 0; | |
| 1614 } | |
| 1615 else if (!cpp_interpret_string (pfile, &token->val.str, 1, &str, token->type)) | |
| 1616 return 0; | |
| 1617 | |
| 1618 if (wide) | |
| 1619 result = wide_str_to_charconst (pfile, str, pchars_seen, unsignedp, | |
| 1620 token->type); | |
| 1621 else | |
| 1622 result = narrow_str_to_charconst (pfile, str, pchars_seen, unsignedp); | |
| 1623 | |
| 1624 if (str.text != token->val.str.text) | |
| 1625 free ((void *)str.text); | |
| 1626 | |
| 1627 return result; | |
| 1628 } | |
| 1629 | |
| 1630 /* Convert an identifier denoted by ID and LEN, which might contain | |
| 1631 UCN escapes, to the source character set, either UTF-8 or | |
| 1632 UTF-EBCDIC. Assumes that the identifier is actually a valid identifier. */ | |
| 1633 cpp_hashnode * | |
| 1634 _cpp_interpret_identifier (cpp_reader *pfile, const uchar *id, size_t len) | |
| 1635 { | |
| 1636 /* It turns out that a UCN escape always turns into fewer characters | |
| 1637 than the escape itself, so we can allocate a temporary in advance. */ | |
| 1638 uchar * buf = (uchar *) alloca (len + 1); | |
| 1639 uchar * bufp = buf; | |
| 1640 size_t idp; | |
| 1641 | |
| 1642 for (idp = 0; idp < len; idp++) | |
| 1643 if (id[idp] != '\\') | |
| 1644 *bufp++ = id[idp]; | |
| 1645 else | |
| 1646 { | |
| 1647 unsigned length = id[idp+1] == 'u' ? 4 : 8; | |
| 1648 cppchar_t value = 0; | |
| 1649 size_t bufleft = len - (bufp - buf); | |
| 1650 int rval; | |
| 1651 | |
| 1652 idp += 2; | |
| 1653 while (length && idp < len && ISXDIGIT (id[idp])) | |
| 1654 { | |
| 1655 value = (value << 4) + hex_value (id[idp]); | |
| 1656 idp++; | |
| 1657 length--; | |
| 1658 } | |
| 1659 idp--; | |
| 1660 | |
| 1661 /* Special case for EBCDIC: if the identifier contains | |
| 1662 a '$' specified using a UCN, translate it to EBCDIC. */ | |
| 1663 if (value == 0x24) | |
| 1664 { | |
| 1665 *bufp++ = '$'; | |
| 1666 continue; | |
| 1667 } | |
| 1668 | |
| 1669 rval = one_cppchar_to_utf8 (value, &bufp, &bufleft); | |
| 1670 if (rval) | |
| 1671 { | |
| 1672 errno = rval; | |
| 1673 cpp_errno (pfile, CPP_DL_ERROR, | |
| 1674 "converting UCN to source character set"); | |
| 1675 break; | |
| 1676 } | |
| 1677 } | |
| 1678 | |
| 1679 return CPP_HASHNODE (ht_lookup (pfile->hash_table, | |
| 1680 buf, bufp - buf, HT_ALLOC)); | |
| 1681 } | |
| 1682 | |
| 1683 /* Convert an input buffer (containing the complete contents of one | |
| 1684 source file) from INPUT_CHARSET to the source character set. INPUT | |
| 1685 points to the input buffer, SIZE is its allocated size, and LEN is | |
| 1686 the length of the meaningful data within the buffer. The | |
| 1687 translated buffer is returned, *ST_SIZE is set to the length of | |
| 1688 the meaningful data within the translated buffer, and *BUFFER_START | |
| 1689 is set to the start of the returned buffer. *BUFFER_START may | |
| 1690 differ from the return value in the case of a BOM or other ignored | |
| 1691 marker information. | |
| 1692 | |
| 1693 INPUT is expected to have been allocated with xmalloc. This | |
| 1694 function will either set *BUFFER_START to INPUT, or free it and set | |
| 1695 *BUFFER_START to a pointer to another xmalloc-allocated block of | |
| 1696 memory. */ | |
| 1697 uchar * | |
| 1698 _cpp_convert_input (cpp_reader *pfile, const char *input_charset, | |
| 1699 uchar *input, size_t size, size_t len, | |
| 1700 const unsigned char **buffer_start, off_t *st_size) | |
| 1701 { | |
| 1702 struct cset_converter input_cset; | |
| 1703 struct _cpp_strbuf to; | |
| 1704 unsigned char *buffer; | |
| 1705 | |
| 1706 input_cset = init_iconv_desc (pfile, SOURCE_CHARSET, input_charset); | |
| 1707 if (input_cset.func == convert_no_conversion) | |
| 1708 { | |
| 1709 to.text = input; | |
| 1710 to.asize = size; | |
| 1711 to.len = len; | |
| 1712 } | |
| 1713 else | |
| 1714 { | |
| 1715 to.asize = MAX (65536, len); | |
| 1716 to.text = XNEWVEC (uchar, to.asize); | |
| 1717 to.len = 0; | |
| 1718 | |
| 1719 if (!APPLY_CONVERSION (input_cset, input, len, &to)) | |
| 1720 cpp_error (pfile, CPP_DL_ERROR, | |
| 1721 "failure to convert %s to %s", | |
| 1722 CPP_OPTION (pfile, input_charset), SOURCE_CHARSET); | |
| 1723 | |
| 1724 free (input); | |
| 1725 } | |
| 1726 | |
| 1727 /* Clean up the mess. */ | |
| 1728 if (input_cset.func == convert_using_iconv) | |
| 1729 iconv_close (input_cset.cd); | |
| 1730 | |
| 1731 /* Resize buffer if we allocated substantially too much, or if we | |
| 1732 haven't enough space for the \n-terminator. */ | |
| 1733 if (to.len + 4096 < to.asize || to.len >= to.asize) | |
| 1734 to.text = XRESIZEVEC (uchar, to.text, to.len + 1); | |
| 1735 | |
| 1736 /* If the file is using old-school Mac line endings (\r only), | |
| 1737 terminate with another \r, not an \n, so that we do not mistake | |
| 1738 the \r\n sequence for a single DOS line ending and erroneously | |
| 1739 issue the "No newline at end of file" diagnostic. */ | |
| 1740 if (to.len && to.text[to.len - 1] == '\r') | |
| 1741 to.text[to.len] = '\r'; | |
| 1742 else | |
| 1743 to.text[to.len] = '\n'; | |
| 1744 | |
| 1745 buffer = to.text; | |
| 1746 *st_size = to.len; | |
| 1747 #if HOST_CHARSET == HOST_CHARSET_ASCII | |
| 1748 /* The HOST_CHARSET test just above ensures that the source charset | |
| 1749 is UTF-8. So, ignore a UTF-8 BOM if we see one. Note that | |
| 1750 glib'c UTF-8 iconv() provider (as of glibc 2.7) does not ignore a | |
| 1751 BOM -- however, even if it did, we would still need this code due | |
| 1752 to the 'convert_no_conversion' case. */ | |
| 1753 if (to.len >= 3 && to.text[0] == 0xef && to.text[1] == 0xbb | |
| 1754 && to.text[2] == 0xbf) | |
| 1755 { | |
| 1756 *st_size -= 3; | |
| 1757 buffer += 3; | |
| 1758 } | |
| 1759 #endif | |
| 1760 | |
| 1761 *buffer_start = to.text; | |
| 1762 return buffer; | |
| 1763 } | |
| 1764 | |
| 1765 /* Decide on the default encoding to assume for input files. */ | |
| 1766 const char * | |
| 1767 _cpp_default_encoding (void) | |
| 1768 { | |
| 1769 const char *current_encoding = NULL; | |
| 1770 | |
| 1771 /* We disable this because the default codeset is 7-bit ASCII on | |
| 1772 most platforms, and this causes conversion failures on every | |
| 1773 file in GCC that happens to have one of the upper 128 characters | |
| 1774 in it -- most likely, as part of the name of a contributor. | |
| 1775 We should definitely recognize in-band markers of file encoding, | |
| 1776 like: | |
| 1777 - the appropriate Unicode byte-order mark (FE FF) to recognize | |
| 1778 UTF16 and UCS4 (in both big-endian and little-endian flavors) | |
| 1779 and UTF8 | |
| 1780 - a "#i", "#d", "/ *", "//", " #p" or "#p" (for #pragma) to | |
| 1781 distinguish ASCII and EBCDIC. | |
| 1782 - now we can parse something like "#pragma GCC encoding <xyz> | |
| 1783 on the first line, or even Emacs/VIM's mode line tags (there's | |
| 1784 a problem here in that VIM uses the last line, and Emacs has | |
| 1785 its more elaborate "local variables" convention). | |
| 1786 - investigate whether Java has another common convention, which | |
| 1787 would be friendly to support. | |
| 1788 (Zack Weinberg and Paolo Bonzini, May 20th 2004) */ | |
| 1789 #if defined (HAVE_LOCALE_H) && defined (HAVE_LANGINFO_CODESET) && 0 | |
| 1790 setlocale (LC_CTYPE, ""); | |
| 1791 current_encoding = nl_langinfo (CODESET); | |
| 1792 #endif | |
| 1793 if (current_encoding == NULL || *current_encoding == '\0') | |
| 1794 current_encoding = SOURCE_CHARSET; | |
| 1795 | |
| 1796 return current_encoding; | |
| 1797 } |