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45b966db ZW |
1 | /* CPP Library - lexical analysis. |
2 | Copyright (C) 2000 Free Software Foundation, Inc. | |
3 | Contributed by Per Bothner, 1994-95. | |
4 | Based on CCCP program by Paul Rubin, June 1986 | |
5 | Adapted to ANSI C, Richard Stallman, Jan 1987 | |
6 | Broken out to separate file, Zack Weinberg, Mar 2000 | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU General Public License as published by the | |
10 | Free Software Foundation; either version 2, or (at your option) any | |
11 | later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
21 | ||
22 | #include "config.h" | |
23 | #include "system.h" | |
24 | #include "intl.h" | |
e38992e8 | 25 | #include "hashtab.h" |
45b966db ZW |
26 | #include "cpplib.h" |
27 | #include "cpphash.h" | |
28 | ||
ff2b53ef ZW |
29 | #define PEEKBUF(BUFFER, N) \ |
30 | ((BUFFER)->rlimit - (BUFFER)->cur > (N) ? (BUFFER)->cur[N] : EOF) | |
31 | #define GETBUF(BUFFER) \ | |
32 | ((BUFFER)->cur < (BUFFER)->rlimit ? *(BUFFER)->cur++ : EOF) | |
33 | #define FORWARDBUF(BUFFER, N) ((BUFFER)->cur += (N)) | |
34 | ||
35 | #define PEEKN(N) PEEKBUF (CPP_BUFFER (pfile), N) | |
36 | #define FORWARD(N) FORWARDBUF (CPP_BUFFER (pfile), (N)) | |
37 | #define GETC() GETBUF (CPP_BUFFER (pfile)) | |
38 | #define PEEKC() PEEKBUF (CPP_BUFFER (pfile), 0) | |
45b966db ZW |
39 | |
40 | static void skip_block_comment PARAMS ((cpp_reader *)); | |
41 | static void skip_line_comment PARAMS ((cpp_reader *)); | |
42 | static int maybe_macroexpand PARAMS ((cpp_reader *, long)); | |
43 | static int skip_comment PARAMS ((cpp_reader *, int)); | |
44 | static int copy_comment PARAMS ((cpp_reader *, int)); | |
45 | static void skip_string PARAMS ((cpp_reader *, int)); | |
46 | static void parse_string PARAMS ((cpp_reader *, int)); | |
47 | static U_CHAR *find_position PARAMS ((U_CHAR *, U_CHAR *, unsigned long *)); | |
48 | static int null_cleanup PARAMS ((cpp_buffer *, cpp_reader *)); | |
64aaf407 | 49 | static void null_warning PARAMS ((cpp_reader *, unsigned int)); |
45b966db | 50 | |
f2d5f0cc ZW |
51 | static void safe_fwrite PARAMS ((cpp_reader *, const U_CHAR *, |
52 | size_t, FILE *)); | |
53 | static void output_line_command PARAMS ((cpp_reader *, cpp_printer *)); | |
54 | ||
45b966db ZW |
55 | /* Re-allocates PFILE->token_buffer so it will hold at least N more chars. */ |
56 | ||
57 | void | |
58 | _cpp_grow_token_buffer (pfile, n) | |
59 | cpp_reader *pfile; | |
60 | long n; | |
61 | { | |
62 | long old_written = CPP_WRITTEN (pfile); | |
63 | pfile->token_buffer_size = n + 2 * pfile->token_buffer_size; | |
64 | pfile->token_buffer = (U_CHAR *) | |
65 | xrealloc(pfile->token_buffer, pfile->token_buffer_size); | |
66 | CPP_SET_WRITTEN (pfile, old_written); | |
67 | } | |
68 | ||
69 | static int | |
70 | null_cleanup (pbuf, pfile) | |
71 | cpp_buffer *pbuf ATTRIBUTE_UNUSED; | |
72 | cpp_reader *pfile ATTRIBUTE_UNUSED; | |
73 | { | |
74 | return 0; | |
75 | } | |
76 | ||
77 | /* Allocate a new cpp_buffer for PFILE, and push it on the input buffer stack. | |
78 | If BUFFER != NULL, then use the LENGTH characters in BUFFER | |
79 | as the new input buffer. | |
80 | Return the new buffer, or NULL on failure. */ | |
81 | ||
82 | cpp_buffer * | |
83 | cpp_push_buffer (pfile, buffer, length) | |
84 | cpp_reader *pfile; | |
85 | const U_CHAR *buffer; | |
86 | long length; | |
87 | { | |
88 | cpp_buffer *buf = CPP_BUFFER (pfile); | |
89 | cpp_buffer *new; | |
90 | if (++pfile->buffer_stack_depth == CPP_STACK_MAX) | |
91 | { | |
92 | cpp_fatal (pfile, "macro or `#include' recursion too deep"); | |
93 | return NULL; | |
94 | } | |
95 | ||
96 | new = (cpp_buffer *) xcalloc (1, sizeof (cpp_buffer)); | |
97 | ||
98 | new->if_stack = pfile->if_stack; | |
99 | new->cleanup = null_cleanup; | |
100 | new->buf = new->cur = buffer; | |
ff2b53ef | 101 | new->rlimit = buffer + length; |
45b966db | 102 | new->prev = buf; |
ff2b53ef | 103 | new->mark = NULL; |
45b966db ZW |
104 | new->line_base = NULL; |
105 | ||
106 | CPP_BUFFER (pfile) = new; | |
107 | return new; | |
108 | } | |
109 | ||
110 | cpp_buffer * | |
111 | cpp_pop_buffer (pfile) | |
112 | cpp_reader *pfile; | |
113 | { | |
114 | cpp_buffer *buf = CPP_BUFFER (pfile); | |
115 | if (ACTIVE_MARK_P (pfile)) | |
116 | cpp_ice (pfile, "mark active in cpp_pop_buffer"); | |
117 | (*buf->cleanup) (buf, pfile); | |
118 | CPP_BUFFER (pfile) = CPP_PREV_BUFFER (buf); | |
119 | free (buf); | |
120 | pfile->buffer_stack_depth--; | |
121 | return CPP_BUFFER (pfile); | |
122 | } | |
123 | ||
f2d5f0cc ZW |
124 | /* Deal with the annoying semantics of fwrite. */ |
125 | static void | |
126 | safe_fwrite (pfile, buf, len, fp) | |
127 | cpp_reader *pfile; | |
128 | const U_CHAR *buf; | |
129 | size_t len; | |
130 | FILE *fp; | |
131 | { | |
132 | size_t count; | |
45b966db | 133 | |
f2d5f0cc ZW |
134 | while (len) |
135 | { | |
136 | count = fwrite (buf, 1, len, fp); | |
137 | if (count == 0) | |
138 | goto error; | |
139 | len -= count; | |
140 | buf += count; | |
141 | } | |
142 | return; | |
143 | ||
144 | error: | |
145 | cpp_notice_from_errno (pfile, CPP_OPTION (pfile, out_fname)); | |
146 | } | |
147 | ||
148 | /* Notify the compiler proper that the current line number has jumped, | |
149 | or the current file name has changed. */ | |
150 | ||
151 | static void | |
152 | output_line_command (pfile, print) | |
45b966db | 153 | cpp_reader *pfile; |
f2d5f0cc | 154 | cpp_printer *print; |
45b966db | 155 | { |
f2d5f0cc ZW |
156 | unsigned int line; |
157 | cpp_buffer *ip; | |
158 | enum { same = 0, enter, leave, rname } change; | |
159 | static const char * const codes[] = { "", " 1", " 2", "" }; | |
160 | ||
161 | if (CPP_OPTION (pfile, no_line_commands)) | |
162 | return; | |
163 | ||
164 | ip = cpp_file_buffer (pfile); | |
165 | if (ip == NULL) | |
166 | return; | |
167 | line = CPP_BUF_LINE (ip); | |
168 | ||
f2d5f0cc ZW |
169 | /* Determine whether the current filename has changed, and if so, |
170 | how. 'nominal_fname' values are unique, so they can be compared | |
171 | by comparing pointers. */ | |
172 | if (ip->nominal_fname == print->last_fname) | |
173 | change = same; | |
174 | else | |
45b966db | 175 | { |
f2d5f0cc ZW |
176 | if (pfile->buffer_stack_depth == print->last_bsd) |
177 | change = rname; | |
178 | else | |
45b966db | 179 | { |
f2d5f0cc ZW |
180 | if (pfile->buffer_stack_depth > print->last_bsd) |
181 | change = enter; | |
182 | else | |
183 | change = leave; | |
184 | print->last_bsd = pfile->buffer_stack_depth; | |
45b966db | 185 | } |
f2d5f0cc | 186 | print->last_fname = ip->nominal_fname; |
45b966db | 187 | } |
f2d5f0cc ZW |
188 | /* If the current file has not changed, we can output a few newlines |
189 | instead if we want to increase the line number by a small amount. | |
190 | We cannot do this if print->lineno is zero, because that means we | |
191 | haven't output any line commands yet. (The very first line | |
192 | command output is a `same_file' command.) */ | |
193 | if (change == same && print->lineno != 0 | |
194 | && line >= print->lineno && line < print->lineno + 8) | |
45b966db | 195 | { |
f2d5f0cc | 196 | while (line > print->lineno) |
45b966db | 197 | { |
f2d5f0cc ZW |
198 | putc ('\n', print->outf); |
199 | print->lineno++; | |
45b966db | 200 | } |
f2d5f0cc | 201 | return; |
45b966db | 202 | } |
f2d5f0cc ZW |
203 | |
204 | #ifndef NO_IMPLICIT_EXTERN_C | |
205 | if (CPP_OPTION (pfile, cplusplus)) | |
206 | fprintf (print->outf, "# %u \"%s\"%s%s%s\n", line, ip->nominal_fname, | |
207 | codes[change], | |
208 | ip->system_header_p ? " 3" : "", | |
209 | (ip->system_header_p == 2) ? " 4" : ""); | |
210 | else | |
211 | #endif | |
212 | fprintf (print->outf, "# %u \"%s\"%s%s\n", line, ip->nominal_fname, | |
213 | codes[change], | |
214 | ip->system_header_p ? " 3" : ""); | |
215 | print->lineno = line; | |
216 | } | |
217 | ||
218 | /* Write the contents of the token_buffer to the output stream, and | |
219 | clear the token_buffer. Also handles generating line commands and | |
220 | keeping track of file transitions. */ | |
221 | ||
222 | void | |
223 | cpp_output_tokens (pfile, print) | |
224 | cpp_reader *pfile; | |
225 | cpp_printer *print; | |
226 | { | |
f6fab919 ZW |
227 | if (CPP_WRITTEN (pfile) - print->written) |
228 | { | |
229 | if (CPP_PWRITTEN (pfile)[-1] == '\n' && print->lineno) | |
230 | print->lineno++; | |
231 | safe_fwrite (pfile, pfile->token_buffer, | |
232 | CPP_WRITTEN (pfile) - print->written, print->outf); | |
233 | } | |
f2d5f0cc ZW |
234 | output_line_command (pfile, print); |
235 | CPP_SET_WRITTEN (pfile, print->written); | |
45b966db ZW |
236 | } |
237 | ||
f2d5f0cc ZW |
238 | /* Scan a string (which may have escape marks), perform macro expansion, |
239 | and write the result to the token_buffer. */ | |
45b966db ZW |
240 | |
241 | void | |
f2d5f0cc | 242 | _cpp_expand_to_buffer (pfile, buf, length) |
45b966db ZW |
243 | cpp_reader *pfile; |
244 | const U_CHAR *buf; | |
245 | int length; | |
246 | { | |
f2d5f0cc ZW |
247 | cpp_buffer *ip; |
248 | enum cpp_ttype token; | |
f6fab919 | 249 | U_CHAR *buf1; |
45b966db ZW |
250 | |
251 | if (length < 0) | |
252 | { | |
253 | cpp_ice (pfile, "length < 0 in cpp_expand_to_buffer"); | |
254 | return; | |
255 | } | |
256 | ||
f6fab919 ZW |
257 | /* Copy the buffer, because it might be in an unsafe place - for |
258 | example, a sequence on the token_buffer, where the pointers will | |
259 | be invalidated if we enlarge the token_buffer. */ | |
260 | buf1 = alloca (length); | |
261 | memcpy (buf1, buf, length); | |
262 | ||
45b966db | 263 | /* Set up the input on the input stack. */ |
f6fab919 | 264 | ip = cpp_push_buffer (pfile, buf1, length); |
45b966db ZW |
265 | if (ip == NULL) |
266 | return; | |
267 | ip->has_escapes = 1; | |
268 | ||
269 | /* Scan the input, create the output. */ | |
f2d5f0cc ZW |
270 | for (;;) |
271 | { | |
272 | token = cpp_get_token (pfile); | |
273 | if (token == CPP_EOF) | |
274 | break; | |
275 | if (token == CPP_POP && CPP_BUFFER (pfile) == ip) | |
276 | { | |
277 | cpp_pop_buffer (pfile); | |
278 | break; | |
279 | } | |
280 | } | |
45b966db ZW |
281 | } |
282 | ||
f2d5f0cc ZW |
283 | /* Scan until CPP_BUFFER (PFILE) is exhausted, discarding output. |
284 | Then pop the buffer. */ | |
285 | ||
286 | void | |
287 | cpp_scan_buffer_nooutput (pfile) | |
288 | cpp_reader *pfile; | |
289 | { | |
290 | cpp_buffer *buffer = CPP_BUFFER (pfile); | |
291 | enum cpp_ttype token; | |
292 | unsigned int old_written = CPP_WRITTEN (pfile); | |
293 | /* In no-output mode, we can ignore everything but directives. */ | |
294 | for (;;) | |
295 | { | |
296 | if (! pfile->only_seen_white) | |
297 | _cpp_skip_rest_of_line (pfile); | |
298 | token = cpp_get_token (pfile); | |
299 | if (token == CPP_EOF) | |
300 | break; | |
301 | if (token == CPP_POP && CPP_BUFFER (pfile) == buffer) | |
302 | { | |
303 | cpp_pop_buffer (pfile); | |
304 | break; | |
305 | } | |
306 | } | |
307 | CPP_SET_WRITTEN (pfile, old_written); | |
308 | } | |
309 | ||
310 | /* Scan until CPP_BUFFER (pfile) is exhausted, writing output to PRINT. | |
311 | Then pop the buffer. */ | |
312 | ||
313 | void | |
314 | cpp_scan_buffer (pfile, print) | |
315 | cpp_reader *pfile; | |
316 | cpp_printer *print; | |
317 | { | |
318 | cpp_buffer *buffer = CPP_BUFFER (pfile); | |
319 | enum cpp_ttype token; | |
320 | ||
321 | for (;;) | |
322 | { | |
323 | token = cpp_get_token (pfile); | |
324 | if ((token == CPP_POP && !CPP_IS_MACRO_BUFFER (CPP_BUFFER (pfile))) | |
325 | || token == CPP_EOF || token == CPP_VSPACE | |
326 | /* XXX Temporary kluge - force flush after #include only */ | |
327 | || (token == CPP_DIRECTIVE | |
328 | && CPP_BUFFER (pfile)->nominal_fname != print->last_fname)) | |
329 | { | |
330 | cpp_output_tokens (pfile, print); | |
331 | if (token == CPP_EOF) | |
332 | return; | |
333 | if (token == CPP_POP && CPP_BUFFER (pfile) == buffer) | |
334 | { | |
335 | cpp_pop_buffer (pfile); | |
336 | return; | |
337 | } | |
338 | } | |
339 | } | |
340 | } | |
341 | ||
45b966db ZW |
342 | /* Return the topmost cpp_buffer that corresponds to a file (not a macro). */ |
343 | ||
344 | cpp_buffer * | |
345 | cpp_file_buffer (pfile) | |
346 | cpp_reader *pfile; | |
347 | { | |
348 | cpp_buffer *ip; | |
349 | ||
350 | for (ip = CPP_BUFFER (pfile); ip; ip = CPP_PREV_BUFFER (ip)) | |
351 | if (ip->ihash != NULL) | |
352 | return ip; | |
353 | return NULL; | |
354 | } | |
355 | ||
356 | /* Skip a C-style block comment. We know it's a comment, and point is | |
357 | at the second character of the starter. */ | |
358 | static void | |
359 | skip_block_comment (pfile) | |
360 | cpp_reader *pfile; | |
361 | { | |
3a2b2c7a | 362 | unsigned int line, col; |
61474454 | 363 | const U_CHAR *limit, *cur; |
45b966db ZW |
364 | |
365 | FORWARD(1); | |
3a2b2c7a ZW |
366 | line = CPP_BUF_LINE (CPP_BUFFER (pfile)); |
367 | col = CPP_BUF_COL (CPP_BUFFER (pfile)); | |
61474454 NB |
368 | limit = CPP_BUFFER (pfile)->rlimit; |
369 | cur = CPP_BUFFER (pfile)->cur; | |
370 | ||
371 | while (cur < limit) | |
45b966db | 372 | { |
61474454 NB |
373 | char c = *cur++; |
374 | if (c == '\n' || c == '\r') | |
45b966db ZW |
375 | { |
376 | /* \r cannot be a macro escape marker here. */ | |
377 | if (!ACTIVE_MARK_P (pfile)) | |
61474454 NB |
378 | CPP_BUMP_LINE_CUR (pfile, cur); |
379 | } | |
380 | else if (c == '*') | |
381 | { | |
382 | /* Check for teminator. */ | |
383 | if (cur < limit && *cur == '/') | |
384 | goto out; | |
385 | ||
386 | /* Warn about comment starter embedded in comment. */ | |
387 | if (cur[-2] == '/' && CPP_OPTION (pfile, warn_comments)) | |
388 | cpp_warning_with_line (pfile, CPP_BUFFER (pfile)->lineno, | |
389 | cur - CPP_BUFFER (pfile)->line_base, | |
390 | "'/*' within comment"); | |
45b966db | 391 | } |
45b966db | 392 | } |
61474454 NB |
393 | |
394 | cpp_error_with_line (pfile, line, col, "unterminated comment"); | |
395 | cur--; | |
396 | out: | |
397 | CPP_BUFFER (pfile)->cur = cur + 1; | |
45b966db ZW |
398 | } |
399 | ||
400 | /* Skip a C++/Chill line comment. We know it's a comment, and point | |
401 | is at the second character of the initiator. */ | |
402 | static void | |
403 | skip_line_comment (pfile) | |
404 | cpp_reader *pfile; | |
405 | { | |
406 | FORWARD(1); | |
407 | for (;;) | |
408 | { | |
409 | int c = GETC (); | |
410 | ||
411 | /* We don't have to worry about EOF in here. */ | |
412 | if (c == '\n') | |
413 | { | |
414 | /* Don't consider final '\n' to be part of comment. */ | |
415 | FORWARD(-1); | |
416 | return; | |
417 | } | |
418 | else if (c == '\r') | |
419 | { | |
420 | /* \r cannot be a macro escape marker here. */ | |
421 | if (!ACTIVE_MARK_P (pfile)) | |
422 | CPP_BUMP_LINE (pfile); | |
ae79697b | 423 | if (CPP_OPTION (pfile, warn_comments)) |
45b966db ZW |
424 | cpp_warning (pfile, "backslash-newline within line comment"); |
425 | } | |
426 | } | |
427 | } | |
428 | ||
429 | /* Skip a comment - C, C++, or Chill style. M is the first character | |
430 | of the comment marker. If this really is a comment, skip to its | |
431 | end and return ' '. If this is not a comment, return M (which will | |
432 | be '/' or '-'). */ | |
433 | ||
434 | static int | |
435 | skip_comment (pfile, m) | |
436 | cpp_reader *pfile; | |
437 | int m; | |
438 | { | |
439 | if (m == '/' && PEEKC() == '*') | |
440 | { | |
441 | skip_block_comment (pfile); | |
442 | return ' '; | |
443 | } | |
444 | else if (m == '/' && PEEKC() == '/') | |
445 | { | |
446 | if (CPP_BUFFER (pfile)->system_header_p) | |
447 | { | |
448 | /* We silently allow C++ comments in system headers, irrespective | |
449 | of conformance mode, because lots of busted systems do that | |
450 | and trying to clean it up in fixincludes is a nightmare. */ | |
451 | skip_line_comment (pfile); | |
452 | return ' '; | |
453 | } | |
ae79697b | 454 | else if (CPP_OPTION (pfile, cplusplus_comments)) |
45b966db | 455 | { |
ae79697b | 456 | if (CPP_OPTION (pfile, c89) |
45b966db ZW |
457 | && CPP_PEDANTIC (pfile) |
458 | && ! CPP_BUFFER (pfile)->warned_cplusplus_comments) | |
459 | { | |
460 | cpp_pedwarn (pfile, | |
461 | "C++ style comments are not allowed in ISO C89"); | |
462 | cpp_pedwarn (pfile, | |
463 | "(this will be reported only once per input file)"); | |
464 | CPP_BUFFER (pfile)->warned_cplusplus_comments = 1; | |
465 | } | |
466 | skip_line_comment (pfile); | |
467 | return ' '; | |
468 | } | |
469 | else | |
470 | return m; | |
471 | } | |
472 | else if (m == '-' && PEEKC() == '-' | |
ae79697b | 473 | && CPP_OPTION (pfile, chill)) |
45b966db ZW |
474 | { |
475 | skip_line_comment (pfile); | |
476 | return ' '; | |
477 | } | |
478 | else | |
479 | return m; | |
480 | } | |
481 | ||
482 | /* Identical to skip_comment except that it copies the comment into the | |
483 | token_buffer. This is used if !discard_comments. */ | |
484 | static int | |
485 | copy_comment (pfile, m) | |
486 | cpp_reader *pfile; | |
487 | int m; | |
488 | { | |
489 | const U_CHAR *start = CPP_BUFFER (pfile)->cur; /* XXX Layering violation */ | |
490 | const U_CHAR *limit; | |
491 | ||
492 | if (skip_comment (pfile, m) == m) | |
493 | return m; | |
494 | ||
495 | limit = CPP_BUFFER (pfile)->cur; | |
496 | CPP_RESERVE (pfile, limit - start + 2); | |
497 | CPP_PUTC_Q (pfile, m); | |
498 | for (; start <= limit; start++) | |
499 | if (*start != '\r') | |
500 | CPP_PUTC_Q (pfile, *start); | |
501 | ||
502 | return ' '; | |
503 | } | |
504 | ||
64aaf407 NB |
505 | static void |
506 | null_warning (pfile, count) | |
507 | cpp_reader *pfile; | |
508 | unsigned int count; | |
509 | { | |
510 | if (count == 1) | |
511 | cpp_warning (pfile, "embedded null character ignored"); | |
512 | else | |
513 | cpp_warning (pfile, "embedded null characters ignored"); | |
514 | } | |
515 | ||
45b966db ZW |
516 | /* Skip whitespace \-newline and comments. Does not macro-expand. */ |
517 | ||
518 | void | |
519 | _cpp_skip_hspace (pfile) | |
520 | cpp_reader *pfile; | |
521 | { | |
64aaf407 | 522 | unsigned int null_count = 0; |
45b966db | 523 | int c; |
64aaf407 | 524 | |
45b966db ZW |
525 | while (1) |
526 | { | |
527 | c = GETC(); | |
528 | if (c == EOF) | |
64aaf407 | 529 | goto out; |
45b966db ZW |
530 | else if (is_hspace(c)) |
531 | { | |
532 | if ((c == '\f' || c == '\v') && CPP_PEDANTIC (pfile)) | |
533 | cpp_pedwarn (pfile, "%s in preprocessing directive", | |
534 | c == '\f' ? "formfeed" : "vertical tab"); | |
64aaf407 NB |
535 | else if (c == '\0') |
536 | null_count++; | |
45b966db ZW |
537 | } |
538 | else if (c == '\r') | |
539 | { | |
540 | /* \r is a backslash-newline marker if !has_escapes, and | |
541 | a deletable-whitespace or no-reexpansion marker otherwise. */ | |
542 | if (CPP_BUFFER (pfile)->has_escapes) | |
543 | { | |
544 | if (PEEKC() == ' ') | |
545 | FORWARD(1); | |
546 | else | |
547 | break; | |
548 | } | |
549 | else | |
550 | CPP_BUMP_LINE (pfile); | |
551 | } | |
552 | else if (c == '/' || c == '-') | |
553 | { | |
554 | c = skip_comment (pfile, c); | |
555 | if (c != ' ') | |
556 | break; | |
557 | } | |
558 | else | |
559 | break; | |
560 | } | |
561 | FORWARD(-1); | |
64aaf407 NB |
562 | out: |
563 | if (null_count) | |
564 | null_warning (pfile, null_count); | |
45b966db ZW |
565 | } |
566 | ||
567 | /* Read and discard the rest of the current line. */ | |
568 | ||
569 | void | |
570 | _cpp_skip_rest_of_line (pfile) | |
571 | cpp_reader *pfile; | |
572 | { | |
573 | for (;;) | |
574 | { | |
575 | int c = GETC(); | |
576 | switch (c) | |
577 | { | |
578 | case '\n': | |
579 | FORWARD(-1); | |
580 | case EOF: | |
581 | return; | |
582 | ||
583 | case '\r': | |
584 | if (! CPP_BUFFER (pfile)->has_escapes) | |
585 | CPP_BUMP_LINE (pfile); | |
586 | break; | |
587 | ||
588 | case '\'': | |
589 | case '\"': | |
590 | skip_string (pfile, c); | |
591 | break; | |
592 | ||
593 | case '/': | |
594 | case '-': | |
595 | skip_comment (pfile, c); | |
596 | break; | |
597 | ||
598 | case '\f': | |
599 | case '\v': | |
600 | if (CPP_PEDANTIC (pfile)) | |
601 | cpp_pedwarn (pfile, "%s in preprocessing directive", | |
602 | c == '\f' ? "formfeed" : "vertical tab"); | |
603 | break; | |
604 | ||
605 | } | |
606 | } | |
607 | } | |
608 | ||
609 | /* Parse an identifier starting with C. */ | |
610 | ||
611 | void | |
612 | _cpp_parse_name (pfile, c) | |
613 | cpp_reader *pfile; | |
614 | int c; | |
615 | { | |
616 | for (;;) | |
617 | { | |
618 | if (! is_idchar(c)) | |
619 | { | |
620 | FORWARD (-1); | |
621 | break; | |
622 | } | |
623 | ||
624 | if (c == '$' && CPP_PEDANTIC (pfile)) | |
625 | cpp_pedwarn (pfile, "`$' in identifier"); | |
626 | ||
627 | CPP_RESERVE(pfile, 2); /* One more for final NUL. */ | |
628 | CPP_PUTC_Q (pfile, c); | |
629 | c = GETC(); | |
630 | if (c == EOF) | |
631 | break; | |
632 | } | |
45b966db ZW |
633 | return; |
634 | } | |
635 | ||
636 | /* Parse and skip over a string starting with C. A single quoted | |
637 | string is treated like a double -- some programs (e.g., troff) are | |
638 | perverse this way. (However, a single quoted string is not allowed | |
639 | to extend over multiple lines.) */ | |
640 | static void | |
641 | skip_string (pfile, c) | |
642 | cpp_reader *pfile; | |
643 | int c; | |
644 | { | |
3a2b2c7a | 645 | unsigned int start_line, start_column; |
64aaf407 | 646 | unsigned int null_count = 0; |
45b966db | 647 | |
3a2b2c7a ZW |
648 | start_line = CPP_BUF_LINE (CPP_BUFFER (pfile)); |
649 | start_column = CPP_BUF_COL (CPP_BUFFER (pfile)); | |
45b966db ZW |
650 | while (1) |
651 | { | |
652 | int cc = GETC(); | |
653 | switch (cc) | |
654 | { | |
655 | case EOF: | |
656 | cpp_error_with_line (pfile, start_line, start_column, | |
657 | "unterminated string or character constant"); | |
658 | if (pfile->multiline_string_line != start_line | |
659 | && pfile->multiline_string_line != 0) | |
660 | cpp_error_with_line (pfile, | |
661 | pfile->multiline_string_line, -1, | |
662 | "possible real start of unterminated constant"); | |
663 | pfile->multiline_string_line = 0; | |
64aaf407 | 664 | goto out; |
45b966db | 665 | |
64aaf407 NB |
666 | case '\0': |
667 | null_count++; | |
668 | break; | |
669 | ||
45b966db ZW |
670 | case '\n': |
671 | CPP_BUMP_LINE (pfile); | |
672 | /* In Fortran and assembly language, silently terminate | |
673 | strings of either variety at end of line. This is a | |
674 | kludge around not knowing where comments are in these | |
675 | languages. */ | |
ae79697b ZW |
676 | if (CPP_OPTION (pfile, lang_fortran) |
677 | || CPP_OPTION (pfile, lang_asm)) | |
45b966db ZW |
678 | { |
679 | FORWARD(-1); | |
64aaf407 | 680 | goto out; |
45b966db ZW |
681 | } |
682 | /* Character constants may not extend over multiple lines. | |
683 | In Standard C, neither may strings. We accept multiline | |
684 | strings as an extension. */ | |
685 | if (c == '\'') | |
686 | { | |
687 | cpp_error_with_line (pfile, start_line, start_column, | |
688 | "unterminated character constant"); | |
689 | FORWARD(-1); | |
64aaf407 | 690 | goto out; |
45b966db ZW |
691 | } |
692 | if (CPP_PEDANTIC (pfile) && pfile->multiline_string_line == 0) | |
693 | cpp_pedwarn_with_line (pfile, start_line, start_column, | |
694 | "string constant runs past end of line"); | |
695 | if (pfile->multiline_string_line == 0) | |
696 | pfile->multiline_string_line = start_line; | |
697 | break; | |
698 | ||
699 | case '\r': | |
700 | if (CPP_BUFFER (pfile)->has_escapes) | |
701 | { | |
702 | cpp_ice (pfile, "\\r escape inside string constant"); | |
703 | FORWARD(1); | |
704 | } | |
705 | else | |
706 | /* Backslash newline is replaced by nothing at all. */ | |
707 | CPP_BUMP_LINE (pfile); | |
708 | break; | |
709 | ||
710 | case '\\': | |
711 | FORWARD(1); | |
712 | break; | |
713 | ||
714 | case '\"': | |
715 | case '\'': | |
716 | if (cc == c) | |
64aaf407 | 717 | goto out; |
45b966db ZW |
718 | break; |
719 | } | |
720 | } | |
64aaf407 NB |
721 | |
722 | out: | |
723 | if (null_count == 1) | |
724 | cpp_warning (pfile, "null character in string or character constant"); | |
725 | else if (null_count > 1) | |
726 | cpp_warning (pfile, "null characters in string or character constant"); | |
45b966db ZW |
727 | } |
728 | ||
729 | /* Parse a string and copy it to the output. */ | |
730 | ||
731 | static void | |
732 | parse_string (pfile, c) | |
733 | cpp_reader *pfile; | |
734 | int c; | |
735 | { | |
736 | const U_CHAR *start = CPP_BUFFER (pfile)->cur; /* XXX Layering violation */ | |
737 | const U_CHAR *limit; | |
738 | ||
739 | skip_string (pfile, c); | |
740 | ||
741 | limit = CPP_BUFFER (pfile)->cur; | |
742 | CPP_RESERVE (pfile, limit - start + 2); | |
743 | CPP_PUTC_Q (pfile, c); | |
744 | for (; start < limit; start++) | |
745 | if (*start != '\r') | |
746 | CPP_PUTC_Q (pfile, *start); | |
747 | } | |
748 | ||
749 | /* Read an assertion into the token buffer, converting to | |
750 | canonical form: `#predicate(a n swe r)' The next non-whitespace | |
751 | character to read should be the first letter of the predicate. | |
752 | Returns 0 for syntax error, 1 for bare predicate, 2 for predicate | |
753 | with answer (see callers for why). In case of 0, an error has been | |
754 | printed. */ | |
755 | int | |
756 | _cpp_parse_assertion (pfile) | |
757 | cpp_reader *pfile; | |
758 | { | |
759 | int c, dropwhite; | |
760 | _cpp_skip_hspace (pfile); | |
761 | c = PEEKC(); | |
bfab56e7 ZW |
762 | if (c == '\n') |
763 | { | |
764 | cpp_error (pfile, "assertion without predicate"); | |
765 | return 0; | |
766 | } | |
767 | else if (! is_idstart(c)) | |
45b966db ZW |
768 | { |
769 | cpp_error (pfile, "assertion predicate is not an identifier"); | |
770 | return 0; | |
771 | } | |
772 | CPP_PUTC(pfile, '#'); | |
773 | FORWARD(1); | |
774 | _cpp_parse_name (pfile, c); | |
775 | ||
776 | c = PEEKC(); | |
777 | if (c != '(') | |
778 | { | |
779 | if (is_hspace(c) || c == '\r') | |
780 | _cpp_skip_hspace (pfile); | |
781 | c = PEEKC(); | |
782 | } | |
783 | if (c != '(') | |
784 | return 1; | |
785 | ||
786 | CPP_PUTC(pfile, '('); | |
787 | FORWARD(1); | |
788 | dropwhite = 1; | |
789 | while ((c = GETC()) != ')') | |
790 | { | |
791 | if (is_space(c)) | |
792 | { | |
793 | if (! dropwhite) | |
794 | { | |
795 | CPP_PUTC(pfile, ' '); | |
796 | dropwhite = 1; | |
797 | } | |
798 | } | |
799 | else if (c == '\n' || c == EOF) | |
800 | { | |
801 | if (c == '\n') FORWARD(-1); | |
802 | cpp_error (pfile, "un-terminated assertion answer"); | |
803 | return 0; | |
804 | } | |
805 | else if (c == '\r') | |
806 | /* \r cannot be a macro escape here. */ | |
807 | CPP_BUMP_LINE (pfile); | |
808 | else | |
809 | { | |
810 | CPP_PUTC (pfile, c); | |
811 | dropwhite = 0; | |
812 | } | |
813 | } | |
814 | ||
815 | if (pfile->limit[-1] == ' ') | |
816 | pfile->limit[-1] = ')'; | |
817 | else if (pfile->limit[-1] == '(') | |
818 | { | |
819 | cpp_error (pfile, "empty token sequence in assertion"); | |
820 | return 0; | |
821 | } | |
822 | else | |
823 | CPP_PUTC (pfile, ')'); | |
824 | ||
45b966db ZW |
825 | return 2; |
826 | } | |
827 | ||
828 | /* Get the next token, and add it to the text in pfile->token_buffer. | |
829 | Return the kind of token we got. */ | |
830 | ||
3a2b2c7a | 831 | enum cpp_ttype |
45b966db ZW |
832 | _cpp_lex_token (pfile) |
833 | cpp_reader *pfile; | |
834 | { | |
5eec0563 | 835 | register int c, c2; |
3a2b2c7a | 836 | enum cpp_ttype token; |
45b966db | 837 | |
f2d5f0cc ZW |
838 | if (CPP_BUFFER (pfile) == NULL) |
839 | return CPP_EOF; | |
840 | ||
45b966db ZW |
841 | get_next: |
842 | c = GETC(); | |
843 | switch (c) | |
844 | { | |
845 | case EOF: | |
846 | return CPP_EOF; | |
847 | ||
848 | case '/': | |
849 | if (PEEKC () == '=') | |
850 | goto op2; | |
851 | ||
852 | comment: | |
ae79697b | 853 | if (CPP_OPTION (pfile, discard_comments)) |
45b966db ZW |
854 | c = skip_comment (pfile, c); |
855 | else | |
856 | c = copy_comment (pfile, c); | |
857 | if (c != ' ') | |
858 | goto randomchar; | |
859 | ||
860 | /* Comments are equivalent to spaces. | |
861 | For -traditional, a comment is equivalent to nothing. */ | |
ff2b53ef | 862 | if (!CPP_OPTION (pfile, discard_comments)) |
45b966db | 863 | return CPP_COMMENT; |
ff2b53ef ZW |
864 | else if (CPP_TRADITIONAL (pfile) |
865 | && ! is_space (PEEKC ())) | |
866 | { | |
867 | if (pfile->parsing_define_directive) | |
868 | return CPP_COMMENT; | |
869 | else | |
870 | goto get_next; | |
871 | } | |
45b966db ZW |
872 | else |
873 | { | |
874 | CPP_PUTC (pfile, c); | |
875 | return CPP_HSPACE; | |
876 | } | |
877 | ||
878 | case '#': | |
5eec0563 JM |
879 | CPP_PUTC (pfile, c); |
880 | ||
881 | hash: | |
45b966db ZW |
882 | if (pfile->parsing_if_directive) |
883 | { | |
f2d5f0cc | 884 | CPP_ADJUST_WRITTEN (pfile, -1); |
bfab56e7 ZW |
885 | if (_cpp_parse_assertion (pfile)) |
886 | return CPP_ASSERTION; | |
5eec0563 | 887 | return CPP_OTHER; |
45b966db ZW |
888 | } |
889 | ||
890 | if (pfile->parsing_define_directive && ! CPP_TRADITIONAL (pfile)) | |
891 | { | |
5eec0563 JM |
892 | c2 = PEEKC (); |
893 | if (c2 == '#') | |
894 | { | |
895 | FORWARD (1); | |
896 | CPP_PUTC (pfile, c2); | |
897 | } | |
898 | else if (c2 == '%' && PEEKN (1) == ':') | |
899 | { | |
900 | /* Digraph: "%:" == "#". */ | |
901 | FORWARD (1); | |
902 | CPP_RESERVE (pfile, 2); | |
903 | CPP_PUTC_Q (pfile, c2); | |
904 | CPP_PUTC_Q (pfile, GETC ()); | |
905 | } | |
906 | else | |
45b966db | 907 | return CPP_STRINGIZE; |
5eec0563 | 908 | |
45b966db ZW |
909 | return CPP_TOKPASTE; |
910 | } | |
911 | ||
912 | if (!pfile->only_seen_white) | |
5eec0563 JM |
913 | return CPP_OTHER; |
914 | ||
915 | /* Remove the "#" or "%:" from the token buffer. */ | |
916 | CPP_ADJUST_WRITTEN (pfile, (c == '#' ? -1 : -2)); | |
45b966db ZW |
917 | return CPP_DIRECTIVE; |
918 | ||
919 | case '\"': | |
920 | case '\'': | |
921 | parse_string (pfile, c); | |
45b966db ZW |
922 | return c == '\'' ? CPP_CHAR : CPP_STRING; |
923 | ||
924 | case '$': | |
ae79697b | 925 | if (!CPP_OPTION (pfile, dollars_in_ident)) |
45b966db ZW |
926 | goto randomchar; |
927 | goto letter; | |
928 | ||
929 | case ':': | |
5eec0563 JM |
930 | c2 = PEEKC (); |
931 | /* Digraph: ":>" == "]". */ | |
932 | if (c2 == '>' | |
933 | || (c2 == ':' && CPP_OPTION (pfile, cplusplus))) | |
45b966db ZW |
934 | goto op2; |
935 | goto randomchar; | |
936 | ||
937 | case '&': | |
938 | case '+': | |
939 | case '|': | |
940 | c2 = PEEKC (); | |
941 | if (c2 == c || c2 == '=') | |
942 | goto op2; | |
943 | goto randomchar; | |
944 | ||
5eec0563 JM |
945 | case '%': |
946 | /* Digraphs: "%:" == "#", "%>" == "}". */ | |
947 | c2 = PEEKC (); | |
948 | if (c2 == ':') | |
949 | { | |
950 | FORWARD (1); | |
951 | CPP_RESERVE (pfile, 2); | |
952 | CPP_PUTC_Q (pfile, c); | |
953 | CPP_PUTC_Q (pfile, c2); | |
954 | goto hash; | |
955 | } | |
956 | else if (c2 == '>') | |
957 | { | |
958 | FORWARD (1); | |
959 | CPP_RESERVE (pfile, 2); | |
960 | CPP_PUTC_Q (pfile, c); | |
961 | CPP_PUTC_Q (pfile, c2); | |
962 | return CPP_RBRACE; | |
963 | } | |
964 | /* else fall through */ | |
965 | ||
45b966db ZW |
966 | case '*': |
967 | case '!': | |
45b966db ZW |
968 | case '=': |
969 | case '^': | |
970 | if (PEEKC () == '=') | |
971 | goto op2; | |
972 | goto randomchar; | |
973 | ||
974 | case '-': | |
975 | c2 = PEEKC (); | |
976 | if (c2 == '-') | |
977 | { | |
ae79697b | 978 | if (CPP_OPTION (pfile, chill)) |
45b966db ZW |
979 | goto comment; /* Chill style comment */ |
980 | else | |
981 | goto op2; | |
982 | } | |
983 | else if (c2 == '=') | |
984 | goto op2; | |
985 | else if (c2 == '>') | |
986 | { | |
ae79697b | 987 | if (CPP_OPTION (pfile, cplusplus) && PEEKN (1) == '*') |
45b966db ZW |
988 | { |
989 | /* In C++, there's a ->* operator. */ | |
990 | token = CPP_OTHER; | |
45b966db ZW |
991 | CPP_RESERVE (pfile, 4); |
992 | CPP_PUTC_Q (pfile, c); | |
993 | CPP_PUTC_Q (pfile, GETC ()); | |
994 | CPP_PUTC_Q (pfile, GETC ()); | |
45b966db ZW |
995 | return token; |
996 | } | |
997 | goto op2; | |
998 | } | |
999 | goto randomchar; | |
1000 | ||
1001 | case '<': | |
1002 | if (pfile->parsing_include_directive) | |
1003 | { | |
1004 | for (;;) | |
1005 | { | |
1006 | CPP_PUTC (pfile, c); | |
1007 | if (c == '>') | |
1008 | break; | |
1009 | c = GETC (); | |
1010 | if (c == '\n' || c == EOF) | |
1011 | { | |
1012 | cpp_error (pfile, | |
1013 | "missing '>' in `#include <FILENAME>'"); | |
1014 | break; | |
1015 | } | |
1016 | else if (c == '\r') | |
1017 | { | |
1018 | if (!CPP_BUFFER (pfile)->has_escapes) | |
1019 | { | |
1020 | /* Backslash newline is replaced by nothing. */ | |
1021 | CPP_ADJUST_WRITTEN (pfile, -1); | |
1022 | CPP_BUMP_LINE (pfile); | |
1023 | } | |
1024 | else | |
1025 | { | |
1026 | /* We might conceivably get \r- or \r<space> in | |
1027 | here. Just delete 'em. */ | |
1028 | int d = GETC(); | |
1029 | if (d != '-' && d != ' ') | |
1030 | cpp_ice (pfile, "unrecognized escape \\r%c", d); | |
1031 | CPP_ADJUST_WRITTEN (pfile, -1); | |
1032 | } | |
1033 | } | |
1034 | } | |
1035 | return CPP_STRING; | |
1036 | } | |
5eec0563 JM |
1037 | /* Digraphs: "<%" == "{", "<:" == "[". */ |
1038 | c2 = PEEKC (); | |
1039 | if (c2 == '%') | |
1040 | { | |
1041 | FORWARD (1); | |
1042 | CPP_RESERVE (pfile, 2); | |
1043 | CPP_PUTC_Q (pfile, c); | |
1044 | CPP_PUTC_Q (pfile, c2); | |
1045 | return CPP_LBRACE; | |
1046 | } | |
1047 | else if (c2 == ':') | |
1048 | goto op2; | |
45b966db ZW |
1049 | /* else fall through */ |
1050 | case '>': | |
1051 | c2 = PEEKC (); | |
1052 | if (c2 == '=') | |
1053 | goto op2; | |
1054 | /* GNU C++ supports MIN and MAX operators <? and >?. */ | |
ae79697b | 1055 | if (c2 != c && (!CPP_OPTION (pfile, cplusplus) || c2 != '?')) |
45b966db ZW |
1056 | goto randomchar; |
1057 | FORWARD(1); | |
5eec0563 JM |
1058 | CPP_RESERVE (pfile, 3); |
1059 | CPP_PUTC_Q (pfile, c); | |
1060 | CPP_PUTC_Q (pfile, c2); | |
1061 | if (PEEKC () == '=') | |
45b966db | 1062 | CPP_PUTC_Q (pfile, GETC ()); |
45b966db ZW |
1063 | return CPP_OTHER; |
1064 | ||
1065 | case '.': | |
1066 | c2 = PEEKC (); | |
5eec0563 | 1067 | if (ISDIGIT (c2)) |
45b966db | 1068 | { |
5eec0563 | 1069 | CPP_PUTC (pfile, c); |
45b966db ZW |
1070 | c = GETC (); |
1071 | goto number; | |
1072 | } | |
1073 | ||
1074 | /* In C++ there's a .* operator. */ | |
ae79697b | 1075 | if (CPP_OPTION (pfile, cplusplus) && c2 == '*') |
45b966db ZW |
1076 | goto op2; |
1077 | ||
1078 | if (c2 == '.' && PEEKN(1) == '.') | |
1079 | { | |
5eec0563 | 1080 | CPP_RESERVE (pfile, 3); |
45b966db ZW |
1081 | CPP_PUTC_Q (pfile, '.'); |
1082 | CPP_PUTC_Q (pfile, '.'); | |
1083 | CPP_PUTC_Q (pfile, '.'); | |
1084 | FORWARD (2); | |
45b966db ZW |
1085 | return CPP_3DOTS; |
1086 | } | |
1087 | goto randomchar; | |
1088 | ||
1089 | op2: | |
5eec0563 | 1090 | CPP_RESERVE (pfile, 2); |
45b966db ZW |
1091 | CPP_PUTC_Q (pfile, c); |
1092 | CPP_PUTC_Q (pfile, GETC ()); | |
5eec0563 | 1093 | return CPP_OTHER; |
45b966db ZW |
1094 | |
1095 | case 'L': | |
1096 | c2 = PEEKC (); | |
1097 | if ((c2 == '\'' || c2 == '\"') && !CPP_TRADITIONAL (pfile)) | |
1098 | { | |
1099 | CPP_PUTC (pfile, c); | |
1100 | c = GETC (); | |
1101 | parse_string (pfile, c); | |
45b966db ZW |
1102 | return c == '\'' ? CPP_WCHAR : CPP_WSTRING; |
1103 | } | |
1104 | goto letter; | |
1105 | ||
1106 | case '0': case '1': case '2': case '3': case '4': | |
1107 | case '5': case '6': case '7': case '8': case '9': | |
1108 | number: | |
1109 | c2 = '.'; | |
1110 | for (;;) | |
1111 | { | |
1112 | CPP_RESERVE (pfile, 2); | |
1113 | CPP_PUTC_Q (pfile, c); | |
1114 | c = PEEKC (); | |
1115 | if (c == EOF) | |
1116 | break; | |
1117 | if (!is_numchar(c) && c != '.' | |
1118 | && ((c2 != 'e' && c2 != 'E' | |
1119 | && ((c2 != 'p' && c2 != 'P') | |
ae79697b | 1120 | || CPP_OPTION (pfile, c89))) |
45b966db ZW |
1121 | || (c != '+' && c != '-'))) |
1122 | break; | |
1123 | FORWARD(1); | |
1124 | c2= c; | |
1125 | } | |
45b966db ZW |
1126 | return CPP_NUMBER; |
1127 | case 'b': case 'c': case 'd': case 'h': case 'o': | |
1128 | case 'B': case 'C': case 'D': case 'H': case 'O': | |
ae79697b | 1129 | if (CPP_OPTION (pfile, chill) && PEEKC () == '\'') |
45b966db | 1130 | { |
45b966db ZW |
1131 | CPP_RESERVE (pfile, 2); |
1132 | CPP_PUTC_Q (pfile, c); | |
1133 | CPP_PUTC_Q (pfile, '\''); | |
1134 | FORWARD(1); | |
1135 | for (;;) | |
1136 | { | |
1137 | c = GETC(); | |
1138 | if (c == EOF) | |
1139 | goto chill_number_eof; | |
1140 | if (!is_numchar(c)) | |
1141 | break; | |
1142 | CPP_PUTC (pfile, c); | |
1143 | } | |
1144 | if (c == '\'') | |
1145 | { | |
1146 | CPP_RESERVE (pfile, 2); | |
1147 | CPP_PUTC_Q (pfile, c); | |
45b966db ZW |
1148 | return CPP_STRING; |
1149 | } | |
1150 | else | |
1151 | { | |
1152 | FORWARD(-1); | |
1153 | chill_number_eof: | |
45b966db ZW |
1154 | return CPP_NUMBER; |
1155 | } | |
1156 | } | |
1157 | else | |
1158 | goto letter; | |
1159 | case '_': | |
1160 | case 'a': case 'e': case 'f': case 'g': case 'i': case 'j': | |
1161 | case 'k': case 'l': case 'm': case 'n': case 'p': case 'q': | |
1162 | case 'r': case 's': case 't': case 'u': case 'v': case 'w': | |
1163 | case 'x': case 'y': case 'z': | |
1164 | case 'A': case 'E': case 'F': case 'G': case 'I': case 'J': | |
1165 | case 'K': case 'M': case 'N': case 'P': case 'Q': case 'R': | |
1166 | case 'S': case 'T': case 'U': case 'V': case 'W': case 'X': | |
1167 | case 'Y': case 'Z': | |
1168 | letter: | |
45b966db ZW |
1169 | _cpp_parse_name (pfile, c); |
1170 | return CPP_MACRO; | |
1171 | ||
64aaf407 NB |
1172 | case ' ': case '\t': case '\v': case '\f': case '\0': |
1173 | { | |
1174 | int null_count = 0; | |
1175 | ||
1176 | for (;;) | |
1177 | { | |
1178 | if (c == '\0') | |
1179 | null_count++; | |
1180 | else | |
1181 | CPP_PUTC (pfile, c); | |
1182 | c = PEEKC (); | |
1183 | if (c == EOF || !is_hspace(c)) | |
1184 | break; | |
1185 | FORWARD(1); | |
1186 | } | |
1187 | if (null_count) | |
1188 | null_warning (pfile, null_count); | |
1189 | return CPP_HSPACE; | |
1190 | } | |
45b966db ZW |
1191 | |
1192 | case '\r': | |
1193 | if (CPP_BUFFER (pfile)->has_escapes) | |
1194 | { | |
1195 | c = GETC (); | |
1196 | if (c == '-') | |
1197 | { | |
1198 | if (pfile->output_escapes) | |
1199 | CPP_PUTS (pfile, "\r-", 2); | |
1200 | _cpp_parse_name (pfile, GETC ()); | |
1201 | return CPP_NAME; | |
1202 | } | |
1203 | else if (c == ' ') | |
1204 | { | |
ff2b53ef ZW |
1205 | /* "\r " means a space, but only if necessary to prevent |
1206 | accidental token concatenation. */ | |
45b966db ZW |
1207 | CPP_RESERVE (pfile, 2); |
1208 | if (pfile->output_escapes) | |
1209 | CPP_PUTC_Q (pfile, '\r'); | |
1210 | CPP_PUTC_Q (pfile, c); | |
1211 | return CPP_HSPACE; | |
1212 | } | |
1213 | else | |
1214 | { | |
1215 | cpp_ice (pfile, "unrecognized escape \\r%c", c); | |
1216 | goto get_next; | |
1217 | } | |
1218 | } | |
1219 | else | |
1220 | { | |
1221 | /* Backslash newline is ignored. */ | |
cbccf5e8 MM |
1222 | if (!ACTIVE_MARK_P (pfile)) |
1223 | CPP_BUMP_LINE (pfile); | |
45b966db ZW |
1224 | goto get_next; |
1225 | } | |
1226 | ||
1227 | case '\n': | |
1228 | CPP_PUTC (pfile, c); | |
45b966db ZW |
1229 | return CPP_VSPACE; |
1230 | ||
1231 | case '(': token = CPP_LPAREN; goto char1; | |
1232 | case ')': token = CPP_RPAREN; goto char1; | |
1233 | case '{': token = CPP_LBRACE; goto char1; | |
1234 | case '}': token = CPP_RBRACE; goto char1; | |
1235 | case ',': token = CPP_COMMA; goto char1; | |
1236 | case ';': token = CPP_SEMICOLON; goto char1; | |
1237 | ||
1238 | randomchar: | |
1239 | default: | |
1240 | token = CPP_OTHER; | |
1241 | char1: | |
45b966db ZW |
1242 | CPP_PUTC (pfile, c); |
1243 | return token; | |
1244 | } | |
1245 | } | |
1246 | ||
1247 | /* Check for and expand a macro, which is from WRITTEN to CPP_WRITTEN (pfile). | |
1248 | Caller is expected to have checked no_macro_expand. */ | |
1249 | static int | |
1250 | maybe_macroexpand (pfile, written) | |
1251 | cpp_reader *pfile; | |
1252 | long written; | |
1253 | { | |
1254 | U_CHAR *macro = pfile->token_buffer + written; | |
1255 | size_t len = CPP_WRITTEN (pfile) - written; | |
1256 | HASHNODE *hp = _cpp_lookup (pfile, macro, len); | |
1257 | ||
1258 | if (!hp) | |
1259 | return 0; | |
1260 | if (hp->type == T_DISABLED) | |
1261 | { | |
1262 | if (pfile->output_escapes) | |
1263 | { | |
1264 | /* Insert a no-reexpand marker before IDENT. */ | |
1265 | CPP_RESERVE (pfile, 2); | |
1266 | CPP_ADJUST_WRITTEN (pfile, 2); | |
1267 | macro = pfile->token_buffer + written; | |
1268 | ||
1269 | memmove (macro + 2, macro, len); | |
1270 | macro[0] = '\r'; | |
1271 | macro[1] = '-'; | |
1272 | } | |
1273 | return 0; | |
1274 | } | |
ff2b53ef ZW |
1275 | if (hp->type == T_EMPTY) |
1276 | { | |
1277 | /* Special case optimization: macro expands to nothing. */ | |
1278 | CPP_SET_WRITTEN (pfile, written); | |
1279 | CPP_PUTC_Q (pfile, ' '); | |
1280 | return 1; | |
1281 | } | |
45b966db ZW |
1282 | |
1283 | /* If macro wants an arglist, verify that a '(' follows. */ | |
1284 | if (hp->type == T_MACRO && hp->value.defn->nargs >= 0) | |
1285 | { | |
1286 | int macbuf_whitespace = 0; | |
1287 | int c; | |
1288 | ||
1289 | while (CPP_IS_MACRO_BUFFER (CPP_BUFFER (pfile))) | |
1290 | { | |
1291 | const U_CHAR *point = CPP_BUFFER (pfile)->cur; | |
1292 | for (;;) | |
1293 | { | |
1294 | _cpp_skip_hspace (pfile); | |
1295 | c = PEEKC (); | |
1296 | if (c == '\n') | |
1297 | FORWARD(1); | |
1298 | else | |
1299 | break; | |
1300 | } | |
1301 | if (point != CPP_BUFFER (pfile)->cur) | |
1302 | macbuf_whitespace = 1; | |
1303 | if (c == '(') | |
1304 | goto is_macro_call; | |
1305 | else if (c != EOF) | |
1306 | goto not_macro_call; | |
1307 | cpp_pop_buffer (pfile); | |
1308 | } | |
1309 | ||
1310 | CPP_SET_MARK (pfile); | |
1311 | for (;;) | |
1312 | { | |
1313 | _cpp_skip_hspace (pfile); | |
1314 | c = PEEKC (); | |
1315 | if (c == '\n') | |
1316 | FORWARD(1); | |
1317 | else | |
1318 | break; | |
1319 | } | |
1320 | CPP_GOTO_MARK (pfile); | |
1321 | ||
1322 | if (c != '(') | |
1323 | { | |
1324 | not_macro_call: | |
1325 | if (macbuf_whitespace) | |
1326 | CPP_PUTC (pfile, ' '); | |
1327 | return 0; | |
1328 | } | |
1329 | } | |
1330 | ||
1331 | is_macro_call: | |
1332 | /* This is now known to be a macro call. | |
1333 | Expand the macro, reading arguments as needed, | |
1334 | and push the expansion on the input stack. */ | |
1335 | _cpp_macroexpand (pfile, hp); | |
1336 | CPP_SET_WRITTEN (pfile, written); | |
1337 | return 1; | |
1338 | } | |
1339 | ||
3a2b2c7a | 1340 | enum cpp_ttype |
45b966db ZW |
1341 | cpp_get_token (pfile) |
1342 | cpp_reader *pfile; | |
1343 | { | |
3a2b2c7a | 1344 | enum cpp_ttype token; |
45b966db ZW |
1345 | long written = CPP_WRITTEN (pfile); |
1346 | ||
1347 | get_next: | |
1348 | token = _cpp_lex_token (pfile); | |
1349 | ||
1350 | switch (token) | |
1351 | { | |
1352 | default: | |
ff2b53ef ZW |
1353 | pfile->potential_control_macro = 0; |
1354 | pfile->only_seen_white = 0; | |
1355 | return token; | |
1356 | ||
1357 | case CPP_VSPACE: | |
1358 | if (pfile->only_seen_white == 0) | |
1359 | pfile->only_seen_white = 1; | |
1360 | CPP_BUMP_LINE (pfile); | |
ff2b53ef ZW |
1361 | return token; |
1362 | ||
1363 | case CPP_HSPACE: | |
1364 | case CPP_COMMENT: | |
45b966db ZW |
1365 | return token; |
1366 | ||
1367 | case CPP_DIRECTIVE: | |
ff2b53ef | 1368 | pfile->potential_control_macro = 0; |
45b966db ZW |
1369 | if (_cpp_handle_directive (pfile)) |
1370 | return CPP_DIRECTIVE; | |
1371 | pfile->only_seen_white = 0; | |
1372 | CPP_PUTC (pfile, '#'); | |
1373 | return CPP_OTHER; | |
1374 | ||
1375 | case CPP_MACRO: | |
ff2b53ef ZW |
1376 | pfile->potential_control_macro = 0; |
1377 | pfile->only_seen_white = 0; | |
45b966db ZW |
1378 | if (! pfile->no_macro_expand |
1379 | && maybe_macroexpand (pfile, written)) | |
1380 | goto get_next; | |
1381 | return CPP_NAME; | |
1382 | ||
1383 | case CPP_EOF: | |
f2d5f0cc ZW |
1384 | if (CPP_BUFFER (pfile) == NULL) |
1385 | return CPP_EOF; | |
45b966db ZW |
1386 | if (CPP_BUFFER (pfile)->manual_pop) |
1387 | /* If we've been reading from redirected input, the | |
1388 | frontend will pop the buffer. */ | |
1389 | return CPP_EOF; | |
45b966db | 1390 | |
f2d5f0cc ZW |
1391 | if (CPP_BUFFER (pfile)->seen_eof) |
1392 | { | |
45b966db ZW |
1393 | cpp_pop_buffer (pfile); |
1394 | goto get_next; | |
1395 | } | |
1396 | else | |
1397 | { | |
1398 | _cpp_handle_eof (pfile); | |
1399 | return CPP_POP; | |
1400 | } | |
1401 | } | |
1402 | } | |
1403 | ||
1404 | /* Like cpp_get_token, but skip spaces and comments. */ | |
1405 | ||
3a2b2c7a | 1406 | enum cpp_ttype |
45b966db ZW |
1407 | cpp_get_non_space_token (pfile) |
1408 | cpp_reader *pfile; | |
1409 | { | |
1410 | int old_written = CPP_WRITTEN (pfile); | |
1411 | for (;;) | |
1412 | { | |
3a2b2c7a | 1413 | enum cpp_ttype token = cpp_get_token (pfile); |
ff2b53ef | 1414 | if (token != CPP_COMMENT && token != CPP_HSPACE && token != CPP_VSPACE) |
45b966db ZW |
1415 | return token; |
1416 | CPP_SET_WRITTEN (pfile, old_written); | |
1417 | } | |
1418 | } | |
1419 | ||
ff2b53ef ZW |
1420 | /* Like cpp_get_token, except that it does not execute directives, |
1421 | does not consume vertical space, and automatically pops off macro | |
1422 | buffers. | |
45b966db | 1423 | |
ff2b53ef ZW |
1424 | XXX This function will exist only till collect_expansion doesn't |
1425 | need to see whitespace anymore, then it'll be merged with | |
1426 | _cpp_get_directive_token (below). */ | |
3a2b2c7a | 1427 | enum cpp_ttype |
ff2b53ef | 1428 | _cpp_get_define_token (pfile) |
45b966db ZW |
1429 | cpp_reader *pfile; |
1430 | { | |
ff2b53ef | 1431 | long old_written; |
3a2b2c7a | 1432 | enum cpp_ttype token; |
45b966db | 1433 | |
ff2b53ef ZW |
1434 | get_next: |
1435 | old_written = CPP_WRITTEN (pfile); | |
1436 | token = _cpp_lex_token (pfile); | |
1437 | switch (token) | |
45b966db | 1438 | { |
ff2b53ef ZW |
1439 | default: |
1440 | return token; | |
45b966db | 1441 | |
ff2b53ef ZW |
1442 | case CPP_VSPACE: |
1443 | /* Put it back and return VSPACE. */ | |
1444 | FORWARD(-1); | |
1445 | CPP_ADJUST_WRITTEN (pfile, -1); | |
1446 | return CPP_VSPACE; | |
45b966db | 1447 | |
ff2b53ef ZW |
1448 | case CPP_HSPACE: |
1449 | if (CPP_PEDANTIC (pfile)) | |
45b966db | 1450 | { |
ff2b53ef ZW |
1451 | U_CHAR *p, *limit; |
1452 | p = pfile->token_buffer + old_written; | |
1453 | limit = CPP_PWRITTEN (pfile); | |
1454 | while (p < limit) | |
1455 | { | |
1456 | if (*p == '\v' || *p == '\f') | |
1457 | cpp_pedwarn (pfile, "%s in preprocessing directive", | |
1458 | *p == '\f' ? "formfeed" : "vertical tab"); | |
1459 | p++; | |
1460 | } | |
45b966db | 1461 | } |
ff2b53ef | 1462 | return CPP_HSPACE; |
45b966db | 1463 | |
ff2b53ef ZW |
1464 | case CPP_DIRECTIVE: |
1465 | /* Don't execute the directive, but don't smash it to OTHER either. */ | |
1466 | CPP_PUTC (pfile, '#'); | |
1467 | return CPP_DIRECTIVE; | |
1468 | ||
1469 | case CPP_MACRO: | |
1470 | if (! pfile->no_macro_expand | |
1471 | && maybe_macroexpand (pfile, old_written)) | |
1472 | goto get_next; | |
1473 | return CPP_NAME; | |
45b966db | 1474 | |
ff2b53ef ZW |
1475 | case CPP_EOF: |
1476 | if (CPP_IS_MACRO_BUFFER (CPP_BUFFER (pfile))) | |
45b966db | 1477 | { |
ff2b53ef ZW |
1478 | cpp_pop_buffer (pfile); |
1479 | goto get_next; | |
45b966db | 1480 | } |
ff2b53ef ZW |
1481 | else |
1482 | /* This can happen for files that don't end with a newline, | |
1483 | and for cpp_define and friends. Pretend they do, so | |
1484 | callers don't have to deal. A warning will be issued by | |
1485 | someone else, if necessary. */ | |
1486 | return CPP_VSPACE; | |
1487 | } | |
1488 | } | |
1489 | ||
1490 | /* Just like _cpp_get_define_token except that it discards horizontal | |
1491 | whitespace. */ | |
45b966db | 1492 | |
3a2b2c7a | 1493 | enum cpp_ttype |
ff2b53ef ZW |
1494 | _cpp_get_directive_token (pfile) |
1495 | cpp_reader *pfile; | |
1496 | { | |
1497 | int old_written = CPP_WRITTEN (pfile); | |
1498 | for (;;) | |
1499 | { | |
3a2b2c7a | 1500 | enum cpp_ttype token = _cpp_get_define_token (pfile); |
ff2b53ef ZW |
1501 | if (token != CPP_COMMENT && token != CPP_HSPACE) |
1502 | return token; | |
1503 | CPP_SET_WRITTEN (pfile, old_written); | |
45b966db ZW |
1504 | } |
1505 | } | |
1506 | ||
1507 | /* Determine the current line and column. Used only by read_and_prescan. */ | |
1508 | static U_CHAR * | |
1509 | find_position (start, limit, linep) | |
1510 | U_CHAR *start; | |
1511 | U_CHAR *limit; | |
1512 | unsigned long *linep; | |
1513 | { | |
1514 | unsigned long line = *linep; | |
1515 | U_CHAR *lbase = start; | |
1516 | while (start < limit) | |
1517 | { | |
1518 | U_CHAR ch = *start++; | |
1519 | if (ch == '\n' || ch == '\r') | |
1520 | { | |
1521 | line++; | |
1522 | lbase = start; | |
1523 | } | |
1524 | } | |
1525 | *linep = line; | |
1526 | return lbase; | |
1527 | } | |
1528 | ||
2a87fbe8 ZW |
1529 | /* The following table is used by _cpp_read_and_prescan. If we have |
1530 | designated initializers, it can be constant data; otherwise, it is | |
1531 | set up at runtime by _cpp_init_input_buffer. */ | |
46d07497 ZW |
1532 | |
1533 | #ifndef UCHAR_MAX | |
1534 | #define UCHAR_MAX 255 /* assume 8-bit bytes */ | |
1535 | #endif | |
1536 | ||
1537 | #if (GCC_VERSION >= 2007) || (__STDC_VERSION__ >= 199901L) | |
2a87fbe8 ZW |
1538 | #define init_chartab() /* nothing */ |
1539 | #define CHARTAB static const unsigned char chartab[UCHAR_MAX + 1] = { | |
46d07497 ZW |
1540 | #define END }; |
1541 | #define s(p, v) [p] = v, | |
1542 | #else | |
2a87fbe8 ZW |
1543 | #define CHARTAB static unsigned char chartab[UCHAR_MAX + 1] = { 0 }; \ |
1544 | static void init_chartab PARAMS ((void)) { \ | |
1545 | unsigned char *x = chartab; | |
46d07497 ZW |
1546 | #define END } |
1547 | #define s(p, v) x[p] = v; | |
1548 | #endif | |
1549 | ||
1550 | /* Table of characters that can't be handled in the inner loop. | |
2a87fbe8 ZW |
1551 | Also contains the mapping between trigraph third characters and their |
1552 | replacements. */ | |
46d07497 ZW |
1553 | #define SPECCASE_CR 1 |
1554 | #define SPECCASE_BACKSLASH 2 | |
1555 | #define SPECCASE_QUESTION 3 | |
1556 | ||
2a87fbe8 | 1557 | CHARTAB |
46d07497 ZW |
1558 | s('\r', SPECCASE_CR) |
1559 | s('\\', SPECCASE_BACKSLASH) | |
1560 | s('?', SPECCASE_QUESTION) | |
46d07497 | 1561 | |
46d07497 ZW |
1562 | s('=', '#') s(')', ']') s('!', '|') |
1563 | s('(', '[') s('\'', '^') s('>', '}') | |
1564 | s('/', '\\') s('<', '{') s('-', '~') | |
1565 | END | |
1566 | ||
1567 | #undef CHARTAB | |
46d07497 ZW |
1568 | #undef END |
1569 | #undef s | |
1570 | ||
2a87fbe8 ZW |
1571 | #define NORMAL(c) ((chartab[c]) == 0 || (chartab[c]) > SPECCASE_QUESTION) |
1572 | #define NONTRI(c) ((c) <= SPECCASE_QUESTION) | |
1573 | ||
45b966db ZW |
1574 | /* Read the entire contents of file DESC into buffer BUF. LEN is how |
1575 | much memory to allocate initially; more will be allocated if | |
1576 | necessary. Convert end-of-line markers (\n, \r, \r\n, \n\r) to | |
1577 | canonical form (\n). If enabled, convert and/or warn about | |
1578 | trigraphs. Convert backslash-newline to a one-character escape | |
1579 | (\r) and remove it from "embarrassing" places (i.e. the middle of a | |
1580 | token). If there is no newline at the end of the file, add one and | |
1581 | warn. Returns -1 on failure, or the actual length of the data to | |
1582 | be scanned. | |
1583 | ||
1584 | This function does a lot of work, and can be a serious performance | |
1585 | bottleneck. It has been tuned heavily; make sure you understand it | |
1586 | before hacking. The common case - no trigraphs, Unix style line | |
1587 | breaks, backslash-newline set off by whitespace, newline at EOF - | |
1588 | has been optimized at the expense of the others. The performance | |
1589 | penalty for DOS style line breaks (\r\n) is about 15%. | |
1590 | ||
1591 | Warnings lose particularly heavily since we have to determine the | |
1592 | line number, which involves scanning from the beginning of the file | |
1593 | or from the last warning. The penalty for the absence of a newline | |
1594 | at the end of reload1.c is about 60%. (reload1.c is 329k.) | |
1595 | ||
1596 | If your file has more than one kind of end-of-line marker, you | |
04e3ec78 NB |
1597 | will get messed-up line numbering. |
1598 | ||
1599 | So that the cases of the switch statement do not have to concern | |
1600 | themselves with the complications of reading beyond the end of the | |
1601 | buffer, the buffer is guaranteed to have at least 3 characters in | |
1602 | it (or however many are left in the file, if less) on entry to the | |
1603 | switch. This is enough to handle trigraphs and the "\\\n\r" and | |
1604 | "\\\r\n" cases. | |
1605 | ||
1606 | The end of the buffer is marked by a '\\', which, being a special | |
1607 | character, guarantees we will exit the fast-scan loops and perform | |
1608 | a refill. */ | |
46d07497 | 1609 | |
45b966db ZW |
1610 | long |
1611 | _cpp_read_and_prescan (pfile, fp, desc, len) | |
1612 | cpp_reader *pfile; | |
1613 | cpp_buffer *fp; | |
1614 | int desc; | |
1615 | size_t len; | |
1616 | { | |
1617 | U_CHAR *buf = (U_CHAR *) xmalloc (len); | |
1618 | U_CHAR *ip, *op, *line_base; | |
1619 | U_CHAR *ibase; | |
45b966db ZW |
1620 | unsigned long line; |
1621 | unsigned int deferred_newlines; | |
45b966db | 1622 | size_t offset; |
04e3ec78 | 1623 | int count = 0; |
45b966db ZW |
1624 | |
1625 | offset = 0; | |
04e3ec78 | 1626 | deferred_newlines = 0; |
45b966db ZW |
1627 | op = buf; |
1628 | line_base = buf; | |
1629 | line = 1; | |
04e3ec78 NB |
1630 | ibase = pfile->input_buffer + 3; |
1631 | ip = ibase; | |
1632 | ip[-1] = '\0'; /* Guarantee no match with \n for SPECCASE_CR */ | |
45b966db ZW |
1633 | |
1634 | for (;;) | |
1635 | { | |
04e3ec78 NB |
1636 | U_CHAR *near_buff_end; |
1637 | ||
04e3ec78 | 1638 | count = read (desc, ibase, pfile->input_buffer_len); |
45b966db ZW |
1639 | if (count < 0) |
1640 | goto error; | |
04e3ec78 NB |
1641 | |
1642 | ibase[count] = '\\'; /* Marks end of buffer */ | |
1643 | if (count) | |
45b966db | 1644 | { |
04e3ec78 NB |
1645 | near_buff_end = pfile->input_buffer + count; |
1646 | offset += count; | |
45b966db | 1647 | if (offset > len) |
04e3ec78 NB |
1648 | { |
1649 | size_t delta_op; | |
1650 | size_t delta_line_base; | |
1b955cba | 1651 | len = offset * 2; |
04e3ec78 NB |
1652 | if (offset > len) |
1653 | /* len overflowed. | |
1654 | This could happen if the file is larger than half the | |
1655 | maximum address space of the machine. */ | |
1656 | goto too_big; | |
1657 | ||
1658 | delta_op = op - buf; | |
1659 | delta_line_base = line_base - buf; | |
1660 | buf = (U_CHAR *) xrealloc (buf, len); | |
1661 | op = buf + delta_op; | |
1662 | line_base = buf + delta_line_base; | |
1663 | } | |
1664 | } | |
1665 | else | |
1666 | { | |
1667 | if (ip == ibase) | |
1668 | break; | |
1669 | /* Allow normal processing of the (at most 2) remaining | |
1670 | characters. The end-of-buffer marker is still present | |
1671 | and prevents false matches within the switch. */ | |
1672 | near_buff_end = ibase - 1; | |
45b966db ZW |
1673 | } |
1674 | ||
1675 | for (;;) | |
1676 | { | |
04e3ec78 | 1677 | unsigned int span; |
45b966db | 1678 | |
04e3ec78 | 1679 | /* Deal with \-newline, potentially in the middle of a token. */ |
45b966db ZW |
1680 | if (deferred_newlines) |
1681 | { | |
2a87fbe8 | 1682 | if (op != buf && ! is_space (op[-1]) && op[-1] != '\r') |
04e3ec78 NB |
1683 | { |
1684 | /* Previous was not white space. Skip to white | |
1685 | space, if we can, before outputting the \r's */ | |
1686 | span = 0; | |
1687 | while (ip[span] != ' ' | |
1688 | && ip[span] != '\t' | |
1689 | && ip[span] != '\n' | |
2a87fbe8 | 1690 | && NORMAL(ip[span])) |
04e3ec78 NB |
1691 | span++; |
1692 | memcpy (op, ip, span); | |
1693 | op += span; | |
1694 | ip += span; | |
2a87fbe8 | 1695 | if (! NORMAL(ip[0])) |
04e3ec78 NB |
1696 | goto do_speccase; |
1697 | } | |
1698 | while (deferred_newlines) | |
1699 | deferred_newlines--, *op++ = '\r'; | |
45b966db ZW |
1700 | } |
1701 | ||
1702 | /* Copy as much as we can without special treatment. */ | |
04e3ec78 | 1703 | span = 0; |
2a87fbe8 | 1704 | while (NORMAL (ip[span])) span++; |
45b966db ZW |
1705 | memcpy (op, ip, span); |
1706 | op += span; | |
1707 | ip += span; | |
1708 | ||
04e3ec78 NB |
1709 | do_speccase: |
1710 | if (ip > near_buff_end) /* Do we have enough chars? */ | |
1711 | break; | |
2a87fbe8 | 1712 | switch (chartab[*ip++]) |
45b966db | 1713 | { |
45b966db | 1714 | case SPECCASE_CR: /* \r */ |
04e3ec78 | 1715 | if (ip[-2] != '\n') |
45b966db | 1716 | { |
04e3ec78 NB |
1717 | if (*ip == '\n') |
1718 | ip++; | |
1719 | *op++ = '\n'; | |
45b966db | 1720 | } |
45b966db ZW |
1721 | break; |
1722 | ||
1723 | case SPECCASE_BACKSLASH: /* \ */ | |
04e3ec78 | 1724 | if (*ip == '\n') |
45b966db | 1725 | { |
04e3ec78 | 1726 | deferred_newlines++; |
45b966db ZW |
1727 | ip++; |
1728 | if (*ip == '\r') ip++; | |
45b966db ZW |
1729 | } |
1730 | else if (*ip == '\r') | |
1731 | { | |
04e3ec78 | 1732 | deferred_newlines++; |
45b966db ZW |
1733 | ip++; |
1734 | if (*ip == '\n') ip++; | |
45b966db ZW |
1735 | } |
1736 | else | |
1737 | *op++ = '\\'; | |
04e3ec78 | 1738 | break; |
45b966db ZW |
1739 | |
1740 | case SPECCASE_QUESTION: /* ? */ | |
1741 | { | |
1742 | unsigned int d, t; | |
04e3ec78 NB |
1743 | |
1744 | *op++ = '?'; /* Normal non-trigraph case */ | |
1745 | if (ip[0] != '?') | |
1746 | break; | |
1747 | ||
45b966db | 1748 | d = ip[1]; |
2a87fbe8 ZW |
1749 | t = chartab[d]; |
1750 | if (NONTRI (t)) | |
04e3ec78 | 1751 | break; |
45b966db | 1752 | |
ae79697b | 1753 | if (CPP_OPTION (pfile, warn_trigraphs)) |
45b966db ZW |
1754 | { |
1755 | unsigned long col; | |
1756 | line_base = find_position (line_base, op, &line); | |
1757 | col = op - line_base + 1; | |
ae79697b | 1758 | if (CPP_OPTION (pfile, trigraphs)) |
45b966db | 1759 | cpp_warning_with_line (pfile, line, col, |
04e3ec78 | 1760 | "trigraph ??%c converted to %c", d, t); |
45b966db ZW |
1761 | else |
1762 | cpp_warning_with_line (pfile, line, col, | |
04e3ec78 | 1763 | "trigraph ??%c ignored", d); |
45b966db | 1764 | } |
04e3ec78 NB |
1765 | |
1766 | ip += 2; | |
ae79697b | 1767 | if (CPP_OPTION (pfile, trigraphs)) |
45b966db | 1768 | { |
04e3ec78 | 1769 | op[-1] = t; /* Overwrite '?' */ |
45b966db | 1770 | if (t == '\\') |
04e3ec78 NB |
1771 | { |
1772 | op--; | |
1773 | *--ip = '\\'; | |
1774 | goto do_speccase; /* May need buffer refill */ | |
1775 | } | |
45b966db ZW |
1776 | } |
1777 | else | |
1778 | { | |
45b966db ZW |
1779 | *op++ = '?'; |
1780 | *op++ = d; | |
1781 | } | |
1782 | } | |
04e3ec78 | 1783 | break; |
45b966db ZW |
1784 | } |
1785 | } | |
f6fab919 ZW |
1786 | /* Copy previous char plus unprocessed (at most 2) chars |
1787 | to beginning of buffer, refill it with another | |
1788 | read(), and continue processing */ | |
1789 | memmove (ip - count - 1, ip - 1, 4 - (ip - near_buff_end)); | |
1790 | ip -= count; | |
45b966db ZW |
1791 | } |
1792 | ||
1793 | if (offset == 0) | |
1794 | return 0; | |
1795 | ||
45b966db ZW |
1796 | if (op[-1] != '\n') |
1797 | { | |
1798 | unsigned long col; | |
1799 | line_base = find_position (line_base, op, &line); | |
1800 | col = op - line_base + 1; | |
f6fab919 | 1801 | cpp_warning_with_line (pfile, line, col, "no newline at end of file"); |
45b966db ZW |
1802 | if (offset + 1 > len) |
1803 | { | |
1804 | len += 1; | |
1805 | if (offset + 1 > len) | |
1806 | goto too_big; | |
1807 | buf = (U_CHAR *) xrealloc (buf, len); | |
1808 | op = buf + offset; | |
1809 | } | |
1810 | *op++ = '\n'; | |
1811 | } | |
1812 | ||
1813 | fp->buf = ((len - offset < 20) ? buf : (U_CHAR *)xrealloc (buf, op - buf)); | |
1814 | return op - buf; | |
1815 | ||
1816 | too_big: | |
f6fab919 ZW |
1817 | cpp_notice (pfile, "%s is too large (>%lu bytes)", fp->ihash->name, |
1818 | (unsigned long)offset); | |
45b966db ZW |
1819 | free (buf); |
1820 | return -1; | |
1821 | ||
1822 | error: | |
1823 | cpp_error_from_errno (pfile, fp->ihash->name); | |
1824 | free (buf); | |
1825 | return -1; | |
1826 | } | |
1827 | ||
2a87fbe8 ZW |
1828 | /* Allocate pfile->input_buffer, and initialize chartab[] |
1829 | if it hasn't happened already. */ | |
46d07497 | 1830 | |
45b966db ZW |
1831 | void |
1832 | _cpp_init_input_buffer (pfile) | |
1833 | cpp_reader *pfile; | |
1834 | { | |
1835 | U_CHAR *tmp; | |
1836 | ||
2a87fbe8 | 1837 | init_chartab (); |
04e3ec78 | 1838 | |
45b966db ZW |
1839 | /* Determine the appropriate size for the input buffer. Normal C |
1840 | source files are smaller than eight K. */ | |
04e3ec78 NB |
1841 | /* 8Kbytes of buffer proper, 1 to detect running off the end without |
1842 | address arithmetic all the time, and 3 for pushback during buffer | |
1843 | refill, in case there's a potential trigraph or end-of-line | |
1844 | digraph at the end of a block. */ | |
45b966db | 1845 | |
04e3ec78 | 1846 | tmp = (U_CHAR *) xmalloc (8192 + 1 + 3); |
45b966db ZW |
1847 | pfile->input_buffer = tmp; |
1848 | pfile->input_buffer_len = 8192; | |
1849 | } |