| blob | 073a6ac8087f5f0c9799ef1133bd7cb394c21c98 |
1 /* -*-C-*-
2 * Wrc preprocessor lexical analysis
3 *
4 * Copyright 1999-2000 Bertho A. Stultiens (BS)
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 * History:
21 * 24-Apr-2000 BS - Started from scratch to restructure everything
22 * and reintegrate the source into the wine-tree.
23 * 04-Jan-2000 BS - Added comments about the lexicographical
24 * grammar to give some insight in the complexity.
25 * 28-Dec-1999 BS - Eliminated backing-up of the flexer by running
26 * `flex -b' on the source. This results in some
27 * weirdo extra rules, but a much faster scanner.
28 * 23-Dec-1999 BS - Started this file
29 *
30 *-------------------------------------------------------------------------
31 * The preprocessor's lexographical grammar (approximately):
32 *
33 * pp := {ws} # {ws} if {ws} {expr} {ws} \n
34 * | {ws} # {ws} ifdef {ws} {id} {ws} \n
35 * | {ws} # {ws} ifndef {ws} {id} {ws} \n
36 * | {ws} # {ws} elif {ws} {expr} {ws} \n
37 * | {ws} # {ws} else {ws} \n
38 * | {ws} # {ws} endif {ws} \n
39 * | {ws} # {ws} include {ws} < {anytext} > \n
40 * | {ws} # {ws} include {ws} " {anytext} " \n
41 * | {ws} # {ws} define {ws} {anytext} \n
42 * | {ws} # {ws} define( {arglist} ) {ws} {expansion} \n
43 * | {ws} # {ws} pragma {ws} {anytext} \n
44 * | {ws} # {ws} ident {ws} {anytext} \n
45 * | {ws} # {ws} error {ws} {anytext} \n
46 * | {ws} # {ws} warning {ws} {anytext} \n
47 * | {ws} # {ws} line {ws} " {anytext} " {number} \n
48 * | {ws} # {ws} {number} " {anytext} " {number} [ {number} [{number}] ] \n
49 * | {ws} # {ws} \n
50 *
51 * ws := [ \t\r\f\v]*
52 *
53 * expr := {expr} [+-*%^/|&] {expr}
54 * | {expr} {logor|logand} {expr}
55 * | [!~+-] {expr}
56 * | {expr} ? {expr} : {expr}
57 *
58 * logor := ||
59 *
60 * logand := &&
61 *
62 * id := [a-zA-Z_][a-zA-Z0-9_]*
63 *
64 * anytext := [^\n]* (see note)
65 *
66 * arglist :=
67 * | {id}
68 * | {arglist} , {id}
69 * | {arglist} , {id} ...
70 *
71 * expansion := {id}
72 * | # {id}
73 * | {anytext}
74 * | {anytext} ## {anytext}
75 *
76 * number := [0-9]+
77 *
78 * Note: "anytext" is not always "[^\n]*". This is because the
79 * trailing context must be considered as well.
80 *
81 * The only certain assumption for the preprocessor to make is that
82 * directives start at the beginning of the line, followed by a '#'
83 * and end with a newline.
84 * Any directive may be suffixed with a line-continuation. Also
85 * classical comment / *...* / (note: no comments within comments,
86 * therefore spaces) is considered to be a line-continuation
87 * (according to gcc and egcs AFAIK, ANSI is a bit vague).
88 * Comments have not been added to the above grammar for simplicity
89 * reasons. However, it is allowed to enter comment anywhere within
90 * the directives as long as they do not interfere with the context.
91 * All comments are considered to be deletable whitespace (both
92 * classical form "/ *...* /" and C++ form "//...\n").
93 *
94 * All recursive scans, except for macro-expansion, are done by the
95 * parser, whereas the simple state transitions of non-recursive
96 * directives are done in the scanner. This results in the many
97 * exclusive start-conditions of the scanner.
98 *
99 * Macro expansions are slightly more difficult because they have to
100 * prescan the arguments. Parameter substitution is literal if the
101 * substitution is # or ## (either side). This enables new identifiers
102 * to be created (see 'info cpp' node Macro|Pitfalls|Prescan for more
103 * information).
104 *
105 * FIXME: Variable macro parameters is recognized, but not yet
106 * expanded. I have to reread the ANSI standard on the subject (yes,
107 * ANSI defines it).
108 *
109 * The following special defines are supported:
110 * __FILE__ -> "thissource.c"
111 * __LINE__ -> 123
112 * __DATE__ -> "May 1 2000"
113 * __TIME__ -> "23:59:59"
114 * These macros expand, as expected, into their ANSI defined values.
115 *
116 * The same include prevention is implemented as gcc and egcs does.
117 * This results in faster processing because we do not read the text
118 * at all. Some wine-sources attempt to include the same file 4 or 5
119 * times. This strategy also saves a lot blank output-lines, which in
120 * its turn improves the real resource scanner/parser.
121 *
122 */
124 /*
125 * Special flex options and exclusive scanner start-conditions
126 */
127 %option stack
128 %option 8bit never-interactive
129 %option nounput
130 %option prefix="pp"
132 %x pp_pp
133 %x pp_eol
134 %x pp_inc
135 %x pp_dqs
136 %x pp_sqs
137 %x pp_iqs
138 %x pp_comment
139 %x pp_def
140 %x pp_define
141 %x pp_macro
142 %x pp_mbody
143 %x pp_macign
144 %x pp_macscan
145 %x pp_macexp
146 %x pp_if
147 %x pp_ifd
148 %x pp_endif
149 %x pp_line
150 %x pp_defined
151 %x pp_ignore
152 %x RCINCL
154 ws [ \v\f\t\r]
155 cident [a-zA-Z_][0-9a-zA-Z_]*
156 ul [uUlL]|[uUlL][lL]|[lL][uU]|[lL][lL][uU]|[uU][lL][lL]|[lL][uU][lL]
158 %{
159 #include <stdio.h>
160 #include <stdlib.h>
161 #include <string.h>
162 #include <ctype.h>
163 #include <assert.h>
165 #include "wpp_private.h"
166 #include "ppy.tab.h"
168 /*
169 * Make sure that we are running an appropriate version of flex.
170 */
171 #if !defined(YY_FLEX_MAJOR_VERSION) || (1000 * YY_FLEX_MAJOR_VERSION + YY_FLEX_MINOR_VERSION < 2005)
172 #error Must use flex version 2.5.1 or higher (yy_scan_* routines are required).
173 #endif
175 #define YY_READ_BUF_SIZE 65536 /* So we read most of a file at once */
177 #define yy_current_state() YY_START
178 #define yy_pp_state(x) yy_pop_state(); yy_push_state(x)
180 /*
181 * Always update the current character position within a line
182 */
183 #define YY_USER_ACTION pp_status.char_number+=ppleng;
185 /*
186 * Buffer management for includes and expansions
187 */
188 #define MAXBUFFERSTACK 128 /* Nesting more than 128 includes or macro expansion textss is insane */
190 typedef struct bufferstackentry {
191 YY_BUFFER_STATE bufferstate; /* Buffer to switch back to */
192 pp_entry_t *define; /* Points to expanding define or NULL if handling includes */
193 int line_number; /* Line that we were handling */
194 int char_number; /* The current position on that line */
195 const char *filename; /* Filename that we were handling */
196 int if_depth; /* How many #if:s deep to check matching #endif:s */
197 int ncontinuations; /* Remember the continuation state */
198 int should_pop; /* Set if we must pop the start-state on EOF */
199 /* Include management */
200 include_state_t incl;
201 char *include_filename;
202 int pass_data;
203 } bufferstackentry_t;
205 #define ALLOCBLOCKSIZE (1 << 10) /* Allocate these chunks at a time for string-buffers */
207 /*
208 * Macro expansion nesting
209 * We need the stack to handle expansions while scanning
210 * a macro's arguments. The TOS must always be the macro
211 * that receives the current expansion from the scanner.
212 */
213 #define MAXMACEXPSTACK 128 /* Nesting more than 128 macro expansions is insane */
215 typedef struct macexpstackentry {
216 pp_entry_t *ppp; /* This macro we are scanning */
217 char **args; /* With these arguments */
218 char **ppargs; /* Resulting in these preprocessed arguments */
219 int *nnls; /* Number of newlines per argument */
220 int nargs; /* And this many arguments scanned */
221 int parentheses; /* Nesting level of () */
222 int curargsize; /* Current scanning argument's size */
223 int curargalloc; /* Current scanning argument's block allocated */
224 char *curarg; /* Current scanning argument's content */
225 } macexpstackentry_t;
227 #define MACROPARENTHESES() (top_macro()->parentheses)
229 /*
230 * Prototypes
231 */
232 static void newline(int);
233 static int make_number(int radix, YYSTYPE *val, const char *str, int len);
234 static void put_buffer(const char *s, int len);
235 static int is_c_h_include(char *fname, int quoted);
236 /* Buffer management */
237 static void push_buffer(pp_entry_t *ppp, char *filename, char *incname, int pop);
238 static bufferstackentry_t *pop_buffer(void);
239 /* String functions */
240 static void new_string(void);
241 static void add_string(const char *str, int len);
242 static char *get_string(void);
243 static void put_string(void);
244 static int string_start(void);
245 /* Macro functions */
246 static void push_macro(pp_entry_t *ppp);
247 static macexpstackentry_t *top_macro(void);
248 static macexpstackentry_t *pop_macro(void);
249 static void free_macro(macexpstackentry_t *mep);
250 static void add_text_to_macro(const char *text, int len);
251 static void macro_add_arg(int last);
252 static void macro_add_expansion(void);
253 /* Expansion */
254 static void expand_special(pp_entry_t *ppp);
255 static void expand_define(pp_entry_t *ppp);
256 static void expand_macro(macexpstackentry_t *mep);
258 /*
259 * Local variables
260 */
261 static int ncontinuations;
263 static int strbuf_idx = 0;
264 static int strbuf_alloc = 0;
265 static char *strbuffer = NULL;
266 static int str_startline;
268 static macexpstackentry_t *macexpstack[MAXMACEXPSTACK];
269 static int macexpstackidx = 0;
271 static bufferstackentry_t bufferstack[MAXBUFFERSTACK];
272 static int bufferstackidx = 0;
274 static int pass_data=1;
276 /*
277 * Global variables
278 */
279 include_state_t pp_incl_state =
280 {
281 -1, /* state */
282 NULL, /* ppp */
283 0, /* ifdepth */
284 0 /* seen_junk */
285 };
287 includelogicentry_t *pp_includelogiclist = NULL;
289 %}
291 /*
292 **************************************************************************
293 * The scanner starts here
294 **************************************************************************
295 */
297 %%
298 /*
299 * Catch line-continuations.
300 * Note: Gcc keeps the line-continuations in, for example, strings
301 * intact. However, I prefer to remove them all so that the next
302 * scanner will not need to reduce the continuation state.
303 *
304 * <*>\\\n newline(0);
305 */
307 /*
308 * Detect the leading # of a preprocessor directive.
309 */
310 <INITIAL,pp_ignore>^{ws}*# pp_incl_state.seen_junk++; yy_push_state(pp_pp);
312 /*
313 * Scan for the preprocessor directives
314 */
315 <pp_pp>{ws}*include{ws}* if(yy_top_state() != pp_ignore) {yy_pp_state(pp_inc); return tINCLUDE;} else {yy_pp_state(pp_eol);}
316 <pp_pp>{ws}*define{ws}* yy_pp_state(yy_current_state() != pp_ignore ? pp_def : pp_eol);
317 <pp_pp>{ws}*error{ws}* yy_pp_state(pp_eol); if(yy_top_state() != pp_ignore) return tERROR;
318 <pp_pp>{ws}*warning{ws}* yy_pp_state(pp_eol); if(yy_top_state() != pp_ignore) return tWARNING;
319 <pp_pp>{ws}*pragma{ws}* yy_pp_state(pp_eol); if(yy_top_state() != pp_ignore) return tPRAGMA;
320 <pp_pp>{ws}*ident{ws}* yy_pp_state(pp_eol); if(yy_top_state() != pp_ignore) return tPPIDENT;
321 <pp_pp>{ws}*undef{ws}* if(yy_top_state() != pp_ignore) {yy_pp_state(pp_ifd); return tUNDEF;} else {yy_pp_state(pp_eol);}
322 <pp_pp>{ws}*ifdef{ws}* yy_pp_state(pp_ifd); return tIFDEF;
323 <pp_pp>{ws}*ifndef{ws}* pp_incl_state.seen_junk--; yy_pp_state(pp_ifd); return tIFNDEF;
324 <pp_pp>{ws}*if{ws}* yy_pp_state(pp_if); return tIF;
325 <pp_pp>{ws}*elif{ws}* yy_pp_state(pp_if); return tELIF;
326 <pp_pp>{ws}*else{ws}* yy_pp_state(pp_endif); return tELSE;
327 <pp_pp>{ws}*endif{ws}* yy_pp_state(pp_endif); return tENDIF;
328 <pp_pp>{ws}*line{ws}* if(yy_top_state() != pp_ignore) {yy_pp_state(pp_line); return tLINE;} else {yy_pp_state(pp_eol);}
329 <pp_pp>{ws}+ if(yy_top_state() != pp_ignore) {yy_pp_state(pp_line); return tGCCLINE;} else {yy_pp_state(pp_eol);}
330 <pp_pp>{ws}*[a-z]+ pperror("Invalid preprocessor token '%s'", pptext);
331 <pp_pp>\r?\n newline(1); yy_pop_state(); return tNL; /* This could be the null-token */
332 <pp_pp>\\\r?\n newline(0);
333 <pp_pp>\\\r? pperror("Preprocessor junk '%s'", pptext);
334 <pp_pp>. return *pptext;
336 /*
337 * Handle #include and #line
338 */
339 <pp_line>[0-9]+ return make_number(10, &pplval, pptext, ppleng);
340 <pp_inc>\< new_string(); add_string(pptext, ppleng); yy_push_state(pp_iqs);
341 <pp_inc,pp_line>\" new_string(); add_string(pptext, ppleng); yy_push_state(pp_dqs);
342 <pp_inc,pp_line>{ws}+ ;
343 <pp_inc,pp_line>\n newline(1); yy_pop_state(); return tNL;
344 <pp_inc,pp_line>\\\r?\n newline(0);
345 <pp_inc,pp_line>(\\\r?)|(.) pperror(yy_current_state() == pp_inc ? "Trailing junk in #include" : "Trailing junk in #line");
347 /*
348 * Ignore all input when a false clause is parsed
349 */
350 <pp_ignore>[^#/\\\n]+ ;
351 <pp_ignore>\n newline(1);
352 <pp_ignore>\\\r?\n newline(0);
353 <pp_ignore>(\\\r?)|(.) ;
355 /*
356 * Handle #if and #elif.
357 * These require conditionals to be evaluated, but we do not
358 * want to jam the scanner normally when we see these tokens.
359 * Note: tIDENT is handled below.
360 */
362 <pp_if>0[0-7]*{ul}? return make_number(8, &pplval, pptext, ppleng);
363 <pp_if>0[0-7]*[8-9]+{ul}? pperror("Invalid octal digit");
364 <pp_if>[1-9][0-9]*{ul}? return make_number(10, &pplval, pptext, ppleng);
365 <pp_if>0[xX][0-9a-fA-F]+{ul}? return make_number(16, &pplval, pptext, ppleng);
366 <pp_if>0[xX] pperror("Invalid hex number");
367 <pp_if>defined yy_push_state(pp_defined); return tDEFINED;
368 <pp_if>"<<" return tLSHIFT;
369 <pp_if>">>" return tRSHIFT;
370 <pp_if>"&&" return tLOGAND;
371 <pp_if>"||" return tLOGOR;
372 <pp_if>"==" return tEQ;
373 <pp_if>"!=" return tNE;
374 <pp_if>"<=" return tLTE;
375 <pp_if>">=" return tGTE;
376 <pp_if>\n newline(1); yy_pop_state(); return tNL;
377 <pp_if>\\\r?\n newline(0);
378 <pp_if>\\\r? pperror("Junk in conditional expression");
379 <pp_if>{ws}+ ;
380 <pp_if>\' new_string(); add_string(pptext, ppleng); yy_push_state(pp_sqs);
381 <pp_if>\" pperror("String constants not allowed in conditionals");
382 <pp_if>. return *pptext;
384 /*
385 * Handle #ifdef, #ifndef and #undef
386 * to get only an untranslated/unexpanded identifier
387 */
388 <pp_ifd>{cident} pplval.cptr = pp_xstrdup(pptext); return tIDENT;
389 <pp_ifd>{ws}+ ;
390 <pp_ifd>\n newline(1); yy_pop_state(); return tNL;
391 <pp_ifd>\\\r?\n newline(0);
392 <pp_ifd>(\\\r?)|(.) pperror("Identifier expected");
394 /*
395 * Handle #else and #endif.
396 */
397 <pp_endif>{ws}+ ;
398 <pp_endif>\n newline(1); yy_pop_state(); return tNL;
399 <pp_endif>\\\r?\n newline(0);
400 <pp_endif>. pperror("Garbage after #else or #endif.");
402 /*
403 * Handle the special 'defined' keyword.
404 * This is necessary to get the identifier prior to any
405 * substitutions.
406 */
407 <pp_defined>{cident} yy_pop_state(); pplval.cptr = pp_xstrdup(pptext); return tIDENT;
408 <pp_defined>{ws}+ ;
409 <pp_defined>(\()|(\)) return *pptext;
410 <pp_defined>\\\r?\n newline(0);
411 <pp_defined>(\\.)|(\n)|(.) pperror("Identifier expected");
413 /*
414 * Handle #error, #warning, #pragma and #ident.
415 * Pass everything literally to the parser, which
416 * will act appropriately.
417 * Comments are stripped from the literal text.
418 */
419 <pp_eol>[^/\\\n]+ if(yy_top_state() != pp_ignore) { pplval.cptr = pp_xstrdup(pptext); return tLITERAL; }
420 <pp_eol>\/[^/\\\n*]* if(yy_top_state() != pp_ignore) { pplval.cptr = pp_xstrdup(pptext); return tLITERAL; }
421 <pp_eol>(\\\r?)|(\/[^/*]) if(yy_top_state() != pp_ignore) { pplval.cptr = pp_xstrdup(pptext); return tLITERAL; }
422 <pp_eol>\n newline(1); yy_pop_state(); if(yy_current_state() != pp_ignore) { return tNL; }
423 <pp_eol>\\\r?\n newline(0);
425 /*
426 * Handle left side of #define
427 */
428 <pp_def>{cident}\( pplval.cptr = pp_xstrdup(pptext); pplval.cptr[ppleng-1] = '\0'; yy_pp_state(pp_macro); return tMACRO;
429 <pp_def>{cident} pplval.cptr = pp_xstrdup(pptext); yy_pp_state(pp_define); return tDEFINE;
430 <pp_def>{ws}+ ;
431 <pp_def>\\\r?\n newline(0);
432 <pp_def>(\\\r?)|(\n)|(.) perror("Identifier expected");
434 /*
435 * Scan the substitution of a define
436 */
437 <pp_define>[^'"/\\\n]+ pplval.cptr = pp_xstrdup(pptext); return tLITERAL;
438 <pp_define>(\\\r?)|(\/[^/*]) pplval.cptr = pp_xstrdup(pptext); return tLITERAL;
439 <pp_define>\\\r?\n{ws}+ newline(0); pplval.cptr = pp_xstrdup(" "); return tLITERAL;
440 <pp_define>\\\r?\n newline(0);
441 <pp_define>\n newline(1); yy_pop_state(); return tNL;
442 <pp_define>\' new_string(); add_string(pptext, ppleng); yy_push_state(pp_sqs);
443 <pp_define>\" new_string(); add_string(pptext, ppleng); yy_push_state(pp_dqs);
445 /*
446 * Scan the definition macro arguments
447 */
448 <pp_macro>\){ws}* yy_pp_state(pp_mbody); return tMACROEND;
449 <pp_macro>{ws}+ ;
450 <pp_macro>{cident} pplval.cptr = pp_xstrdup(pptext); return tIDENT;
451 <pp_macro>, return ',';
452 <pp_macro>"..." return tELIPSIS;
453 <pp_macro>(\\\r?)|(\n)|(.)|(\.\.?) pperror("Argument identifier expected");
454 <pp_macro>\\\r?\n newline(0);
456 /*
457 * Scan the substitution of a macro
458 */
459 <pp_mbody>[^a-zA-Z0-9'"#/\\\n]+ pplval.cptr = pp_xstrdup(pptext); return tLITERAL;
460 <pp_mbody>{cident} pplval.cptr = pp_xstrdup(pptext); return tIDENT;
461 <pp_mbody>\#\# return tCONCAT;
462 <pp_mbody>\# return tSTRINGIZE;
463 <pp_mbody>[0-9][^'"#/\\\n]* pplval.cptr = pp_xstrdup(pptext); return tLITERAL;
464 <pp_mbody>(\\\r?)|(\/[^/*'"#\\\n]*) pplval.cptr = pp_xstrdup(pptext); return tLITERAL;
465 <pp_mbody>\\\r?\n{ws}+ newline(0); pplval.cptr = pp_xstrdup(" "); return tLITERAL;
466 <pp_mbody>\\\r?\n newline(0);
467 <pp_mbody>\n newline(1); yy_pop_state(); return tNL;
468 <pp_mbody>\' new_string(); add_string(pptext, ppleng); yy_push_state(pp_sqs);
469 <pp_mbody>\" new_string(); add_string(pptext, ppleng); yy_push_state(pp_dqs);
471 /*
472 * Macro expansion text scanning.
473 * This state is active just after the identifier is scanned
474 * that triggers an expansion. We *must* delete the leading
475 * whitespace before we can start scanning for arguments.
476 *
477 * If we do not see a '(' as next trailing token, then we have
478 * a false alarm. We just continue with a nose-bleed...
479 */
480 <pp_macign>{ws}*/\( yy_pp_state(pp_macscan);
481 <pp_macign>{ws}*\n {
482 if(yy_top_state() != pp_macscan)
483 newline(0);
484 }
485 <pp_macign>{ws}*\\\r?\n newline(0);
486 <pp_macign>{ws}+|{ws}*\\\r?|. {
487 macexpstackentry_t *mac = pop_macro();
488 yy_pop_state();
489 put_buffer(mac->ppp->ident, strlen(mac->ppp->ident));
490 put_buffer(pptext, ppleng);
491 free_macro(mac);
492 }
494 /*
495 * Macro expansion argument text scanning.
496 * This state is active when a macro's arguments are being read for expansion.
497 */
498 <pp_macscan>\( {
499 if(++MACROPARENTHESES() > 1)
500 add_text_to_macro(pptext, ppleng);
501 }
502 <pp_macscan>\) {
503 if(--MACROPARENTHESES() == 0)
504 {
505 yy_pop_state();
506 macro_add_arg(1);
507 }
508 else
509 add_text_to_macro(pptext, ppleng);
510 }
511 <pp_macscan>, {
512 if(MACROPARENTHESES() > 1)
513 add_text_to_macro(pptext, ppleng);
514 else
515 macro_add_arg(0);
516 }
517 <pp_macscan>\" new_string(); add_string(pptext, ppleng); yy_push_state(pp_dqs);
518 <pp_macscan>\' new_string(); add_string(pptext, ppleng); yy_push_state(pp_sqs);
519 <pp_macscan>"/*" yy_push_state(pp_comment); add_text_to_macro(" ", 1);
520 <pp_macscan>\n pp_status.line_number++; pp_status.char_number = 1; add_text_to_macro(pptext, ppleng);
521 <pp_macscan>([^/(),\\\n"']+)|(\/[^/*(),\\\n'"]*)|(\\\r?)|(.) add_text_to_macro(pptext, ppleng);
522 <pp_macscan>\\\r?\n newline(0);
524 /*
525 * Comment handling (almost all start-conditions)
526 */
527 <INITIAL,pp_pp,pp_ignore,pp_eol,pp_inc,pp_if,pp_ifd,pp_endif,pp_defined,pp_def,pp_define,pp_macro,pp_mbody,RCINCL>"/*" yy_push_state(pp_comment);
528 <pp_comment>[^*\n]*|"*"+[^*/\n]* ;
529 <pp_comment>\n newline(0);
530 <pp_comment>"*"+"/" yy_pop_state();
532 /*
533 * Remove C++ style comment (almost all start-conditions)
534 */
535 <INITIAL,pp_pp,pp_ignore,pp_eol,pp_inc,pp_if,pp_ifd,pp_endif,pp_defined,pp_def,pp_define,pp_macro,pp_mbody,pp_macscan,RCINCL>"//"[^\n]* {
536 if(pptext[ppleng-1] == '\\')
537 ppwarning("C++ style comment ends with an escaped newline (escape ignored)");
538 }
540 /*
541 * Single, double and <> quoted constants
542 */
543 <INITIAL,pp_macexp>\" pp_incl_state.seen_junk++; new_string(); add_string(pptext, ppleng); yy_push_state(pp_dqs);
544 <INITIAL,pp_macexp>\' pp_incl_state.seen_junk++; new_string(); add_string(pptext, ppleng); yy_push_state(pp_sqs);
545 <pp_dqs>[^"\\\n]+ add_string(pptext, ppleng);
546 <pp_dqs>\" {
547 add_string(pptext, ppleng);
548 yy_pop_state();
549 switch(yy_current_state())
550 {
551 case pp_pp:
552 case pp_define:
553 case pp_mbody:
554 case pp_inc:
555 case RCINCL:
556 if (yy_current_state()==RCINCL) yy_pop_state();
557 pplval.cptr = get_string();
558 return tDQSTRING;
559 case pp_line:
560 pplval.cptr = get_string();
561 if (is_c_h_include(pplval.cptr, 1)) pass_data=0;
562 else pass_data=1;
563 return tDQSTRING;
564 default:
565 put_string();
566 }
567 }
568 <pp_sqs>[^'\\\n]+ add_string(pptext, ppleng);
569 <pp_sqs>\' {
570 add_string(pptext, ppleng);
571 yy_pop_state();
572 switch(yy_current_state())
573 {
574 case pp_if:
575 case pp_define:
576 case pp_mbody:
577 pplval.cptr = get_string();
578 return tSQSTRING;
579 default:
580 put_string();
581 }
582 }
583 <pp_iqs>[^\>\\\n]+ add_string(pptext, ppleng);
584 <pp_iqs>\> {
585 add_string(pptext, ppleng);
586 yy_pop_state();
587 pplval.cptr = get_string();
588 return tIQSTRING;
589 }
590 <pp_dqs>\\\r?\n {
591 /*
592 * This is tricky; we need to remove the line-continuation
593 * from preprocessor strings, but OTOH retain them in all
594 * other strings. This is because the resource grammar is
595 * even more braindead than initially analysed and line-
596 * continuations in strings introduce, sigh, newlines in
597 * the output. There goes the concept of non-breaking, non-
598 * spacing whitespace.
599 */
600 switch(yy_top_state())
601 {
602 case pp_pp:
603 case pp_define:
604 case pp_mbody:
605 case pp_inc:
606 case pp_line:
607 newline(0);
608 break;
609 default:
610 add_string(pptext, ppleng);
611 newline(-1);
612 }
613 }
614 <pp_iqs,pp_dqs,pp_sqs>\\. add_string(pptext, ppleng);
615 <pp_iqs,pp_dqs,pp_sqs>\n {
616 newline(1);
617 add_string(pptext, ppleng);
618 ppwarning("Newline in string constant encounterd (started line %d)", string_start());
619 }
621 /*
622 * Identifier scanning
623 */
624 <INITIAL,pp_if,pp_inc,pp_macexp>{cident} {
625 pp_entry_t *ppp;
626 pp_incl_state.seen_junk++;
627 if(!(ppp = pplookup(pptext)))
628 {
629 if(yy_current_state() == pp_inc)
630 pperror("Expected include filename");
632 if(yy_current_state() == pp_if)
633 {
634 pplval.cptr = pp_xstrdup(pptext);
635 return tIDENT;
636 }
637 else {
638 if((yy_current_state()==INITIAL) && (strcasecmp(pptext,"RCINCLUDE")==0)){
639 yy_push_state(RCINCL);
640 return tRCINCLUDE;
641 }
642 else put_buffer(pptext, ppleng);
643 }
644 }
645 else if(!ppp->expanding)
646 {
647 switch(ppp->type)
648 {
649 case def_special:
650 expand_special(ppp);
651 break;
652 case def_define:
653 expand_define(ppp);
654 break;
655 case def_macro:
656 yy_push_state(pp_macign);
657 push_macro(ppp);
658 break;
659 default:
660 pp_internal_error(__FILE__, __LINE__, "Invalid define type %d\n", ppp->type);
661 }
662 }
663 }
665 /*
666 * Everything else that needs to be passed and
667 * newline and continuation handling
668 */
669 <INITIAL,pp_macexp>[^a-zA-Z_#'"/\\\n \r\t\f\v]+|(\/|\\)[^a-zA-Z_/*'"\\\n \r\t\v\f]* pp_incl_state.seen_junk++; put_buffer(pptext, ppleng);
670 <INITIAL,pp_macexp>{ws}+ put_buffer(pptext, ppleng);
671 <INITIAL>\n newline(1);
672 <INITIAL>\\\r?\n newline(0);
673 <INITIAL>\\\r? pp_incl_state.seen_junk++; put_buffer(pptext, ppleng);
675 /*
676 * Special catcher for macro argmument expansion to prevent
677 * newlines to propagate to the output or admin.
678 */
679 <pp_macexp>(\n)|(.)|(\\\r?(\n|.)) put_buffer(pptext, ppleng);
681 <RCINCL>[A-Za-z0-9_\.\\/]+ {
682 pplval.cptr=pp_xstrdup(pptext);
683 yy_pop_state();
684 return tRCINCLUDEPATH;
685 }
687 <RCINCL>{ws}+ ;
689 <RCINCL>\" {
690 new_string(); add_string(pptext,ppleng);yy_push_state(pp_dqs);
691 }
693 /*
694 * This is a 'catch-all' rule to discover errors in the scanner
695 * in an orderly manner.
696 */
697 <*>. pp_incl_state.seen_junk++; ppwarning("Unmatched text '%c' (0x%02x); please report\n", isprint(*pptext & 0xff) ? *pptext : ' ', *pptext);
699 <<EOF>> {
700 YY_BUFFER_STATE b = YY_CURRENT_BUFFER;
701 bufferstackentry_t *bep = pop_buffer();
703 if((!bep && pp_get_if_depth()) || (bep && pp_get_if_depth() != bep->if_depth))
704 ppwarning("Unmatched #if/#endif at end of file");
706 if(!bep)
707 {
708 if(YY_START != INITIAL)
709 pperror("Unexpected end of file during preprocessing");
710 yyterminate();
711 }
712 else if(bep->should_pop == 2)
713 {
714 macexpstackentry_t *mac;
715 mac = pop_macro();
716 expand_macro(mac);
717 }
718 pp_delete_buffer(b);
719 }
721 %%
722 /*
723 **************************************************************************
724 * Support functions
725 **************************************************************************
726 */
728 #ifndef ppwrap
729 int ppwrap(void)
730 {
731 return 1;
732 }
733 #endif
736 /*
737 *-------------------------------------------------------------------------
738 * Output newlines or set them as continuations
739 *
740 * Input: -1 - Don't count this one, but update local position (see pp_dqs)
741 * 0 - Line-continuation seen and cache output
742 * 1 - Newline seen and flush output
743 *-------------------------------------------------------------------------
744 */
745 static void newline(int dowrite)
746 {
747 pp_status.line_number++;
748 pp_status.char_number = 1;
750 if(dowrite == -1)
751 return;
753 ncontinuations++;
754 if(dowrite)
755 {
756 for(;ncontinuations; ncontinuations--)
757 put_buffer("\n", 1);
758 }
759 }
762 /*
763 *-------------------------------------------------------------------------
764 * Make a number out of an any-base and suffixed string
765 *
766 * Possible number extensions:
767 * - "" int
768 * - "L" long int
769 * - "LL" long long int
770 * - "U" unsigned int
771 * - "UL" unsigned long int
772 * - "ULL" unsigned long long int
773 * - "LU" unsigned long int
774 * - "LLU" unsigned long long int
775 * - "LUL" invalid
776 *
777 * FIXME:
778 * The sizes of resulting 'int' and 'long' are compiler specific.
779 * I depend on sizeof(int) > 2 here (although a relatively safe
780 * assumption).
781 * Long longs are not yet implemented because this is very compiler
782 * specific and I don't want to think too much about the problems.
783 *
784 *-------------------------------------------------------------------------
785 */
786 static int make_number(int radix, YYSTYPE *val, const char *str, int len)
787 {
788 int is_l = 0;
789 int is_ll = 0;
790 int is_u = 0;
791 char ext[4];
793 ext[3] = '\0';
794 ext[2] = toupper(str[len-1]);
795 ext[1] = len > 1 ? toupper(str[len-2]) : ' ';
796 ext[0] = len > 2 ? toupper(str[len-3]) : ' ';
798 if(!strcmp(ext, "LUL"))
799 pperror("Invalid constant suffix");
800 else if(!strcmp(ext, "LLU") || !strcmp(ext, "ULL"))
801 {
802 is_ll++;
803 is_u++;
804 }
805 else if(!strcmp(ext+1, "LU") || !strcmp(ext+1, "UL"))
806 {
807 is_l++;
808 is_u++;
809 }
810 else if(!strcmp(ext+1, "LL"))
811 {
812 is_ll++;
813 }
814 else if(!strcmp(ext+2, "L"))
815 {
816 is_l++;
817 }
818 else if(!strcmp(ext+2, "U"))
819 {
820 is_u++;
821 }
823 if(is_ll)
824 pp_internal_error(__FILE__, __LINE__, "long long constants not implemented yet");
826 if(is_u && is_l)
827 {
828 val->ulong = strtoul(str, NULL, radix);
829 return tULONG;
830 }
831 else if(!is_u && is_l)
832 {
833 val->slong = strtol(str, NULL, radix);
834 return tSLONG;
835 }
836 else if(is_u && !is_l)
837 {
838 val->uint = (unsigned int)strtoul(str, NULL, radix);
839 return tUINT;
840 }
842 /* Else it must be an int... */
843 val->sint = (int)strtol(str, NULL, radix);
844 return tSINT;
845 }
848 /*
849 *-------------------------------------------------------------------------
850 * Macro and define expansion support
851 *
852 * FIXME: Variable macro arguments.
853 *-------------------------------------------------------------------------
854 */
855 static void expand_special(pp_entry_t *ppp)
856 {
857 const char *dbgtext = "?";
858 static char *buf = NULL;
860 assert(ppp->type == def_special);
862 if(!strcmp(ppp->ident, "__LINE__"))
863 {
864 dbgtext = "def_special(__LINE__)";
865 buf = pp_xrealloc(buf, 32);
866 sprintf(buf, "%d", pp_status.line_number);
867 }
868 else if(!strcmp(ppp->ident, "__FILE__"))
869 {
870 dbgtext = "def_special(__FILE__)";
871 buf = pp_xrealloc(buf, strlen(pp_status.input) + 3);
872 sprintf(buf, "\"%s\"", pp_status.input);
873 }
874 else
875 pp_internal_error(__FILE__, __LINE__, "Special macro '%s' not found...\n", ppp->ident);
877 if(pp_flex_debug)
878 fprintf(stderr, "expand_special(%d): %s:%d: '%s' -> '%s'\n",
879 macexpstackidx,
880 pp_status.input,
881 pp_status.line_number,
882 ppp->ident,
883 buf ? buf : "");
885 if(buf && buf[0])
886 {
887 push_buffer(ppp, NULL, NULL, 0);
888 yy_scan_string(buf);
889 }
890 }
892 static void expand_define(pp_entry_t *ppp)
893 {
894 assert(ppp->type == def_define);
896 if(pp_flex_debug)
897 fprintf(stderr, "expand_define(%d): %s:%d: '%s' -> '%s'\n",
898 macexpstackidx,
899 pp_status.input,
900 pp_status.line_number,
901 ppp->ident,
902 ppp->subst.text);
903 if(ppp->subst.text && ppp->subst.text[0])
904 {
905 push_buffer(ppp, NULL, NULL, 0);
906 yy_scan_string(ppp->subst.text);
907 }
908 }
910 static int curdef_idx = 0;
911 static int curdef_alloc = 0;
912 static char *curdef_text = NULL;
914 static void add_text(const char *str, int len)
915 {
916 if(len == 0)
917 return;
918 if(curdef_idx >= curdef_alloc || curdef_alloc - curdef_idx < len)
919 {
920 curdef_alloc += (len + ALLOCBLOCKSIZE-1) & ~(ALLOCBLOCKSIZE-1);
921 curdef_text = pp_xrealloc(curdef_text, curdef_alloc * sizeof(curdef_text[0]));
922 if(curdef_alloc > 65536)
923 ppwarning("Reallocating macro-expansion buffer larger than 64kB");
924 }
925 memcpy(&curdef_text[curdef_idx], str, len);
926 curdef_idx += len;
927 }
929 static mtext_t *add_expand_text(mtext_t *mtp, macexpstackentry_t *mep, int *nnl)
930 {
931 char *cptr;
932 char *exp;
933 int tag;
934 int n;
936 if(mtp == NULL)
937 return NULL;
939 switch(mtp->type)
940 {
941 case exp_text:
942 if(pp_flex_debug)
943 fprintf(stderr, "add_expand_text: exp_text: '%s'\n", mtp->subst.text);
944 add_text(mtp->subst.text, strlen(mtp->subst.text));
945 break;
947 case exp_stringize:
948 if(pp_flex_debug)
949 fprintf(stderr, "add_expand_text: exp_stringize(%d): '%s'\n",
950 mtp->subst.argidx,
951 mep->args[mtp->subst.argidx]);
952 cptr = mep->args[mtp->subst.argidx];
953 add_text("\"", 1);
954 while(*cptr)
955 {
956 if(*cptr == '"' || *cptr == '\\')
957 add_text("\\", 1);
958 add_text(cptr, 1);
959 cptr++;
960 }
961 add_text("\"", 1);
962 break;
964 case exp_concat:
965 if(pp_flex_debug)
966 fprintf(stderr, "add_expand_text: exp_concat\n");
967 /* Remove trailing whitespace from current expansion text */
968 while(curdef_idx)
969 {
970 if(isspace(curdef_text[curdef_idx-1] & 0xff))
971 curdef_idx--;
972 else
973 break;
974 }
975 /* tag current position and recursively expand the next part */
976 tag = curdef_idx;
977 mtp = add_expand_text(mtp->next, mep, nnl);
979 /* Now get rid of the leading space of the expansion */
980 cptr = &curdef_text[tag];
981 n = curdef_idx - tag;
982 while(n)
983 {
984 if(isspace(*cptr & 0xff))
985 {
986 cptr++;
987 n--;
988 }
989 else
990 break;
991 }
992 if(cptr != &curdef_text[tag])
993 {
994 memmove(&curdef_text[tag], cptr, n);
995 curdef_idx -= (curdef_idx - tag) - n;
996 }
997 break;
999 case exp_subst:
1000 if((mtp->next && mtp->next->type == exp_concat) || (mtp->prev && mtp->prev->type == exp_concat))
1001 exp = mep->args[mtp->subst.argidx];
1002 else
1003 exp = mep->ppargs[mtp->subst.argidx];
1004 if(exp)
1005 {
1006 add_text(exp, strlen(exp));
1007 *nnl -= mep->nnls[mtp->subst.argidx];
1008 cptr = strchr(exp, '\n');
1009 while(cptr)
1010 {
1011 *cptr = ' ';
1012 cptr = strchr(cptr+1, '\n');
1013 }
1014 mep->nnls[mtp->subst.argidx] = 0;
1015 }
1016 if(pp_flex_debug)
1017 fprintf(stderr, "add_expand_text: exp_subst(%d): '%s'\n", mtp->subst.argidx, exp);
1018 break;
1020 default:
1021 pp_internal_error(__FILE__, __LINE__, "Invalid expansion type (%d) in macro expansion\n", mtp->type);
1022 }
1023 return mtp;
1024 }
1026 static void expand_macro(macexpstackentry_t *mep)
1027 {
1028 mtext_t *mtp;
1029 int n, k;
1030 char *cptr;
1031 int nnl = 0;
1032 pp_entry_t *ppp = mep->ppp;
1033 int nargs = mep->nargs;
1035 assert(ppp->type == def_macro);
1036 assert(ppp->expanding == 0);
1038 if((ppp->nargs >= 0 && nargs != ppp->nargs) || (ppp->nargs < 0 && nargs < -ppp->nargs))
1039 pperror("Too %s macro arguments (%d)", nargs < abs(ppp->nargs) ? "few" : "many", nargs);
1041 for(n = 0; n < nargs; n++)
1042 nnl += mep->nnls[n];
1044 if(pp_flex_debug)
1045 fprintf(stderr, "expand_macro(%d): %s:%d: '%s'(%d,%d) -> ...\n",
1046 macexpstackidx,
1047 pp_status.input,
1048 pp_status.line_number,
1049 ppp->ident,
1050 mep->nargs,
1051 nnl);
1053 curdef_idx = 0;
1055 for(mtp = ppp->subst.mtext; mtp; mtp = mtp->next)
1056 {
1057 if(!(mtp = add_expand_text(mtp, mep, &nnl)))
1058 break;
1059 }
1061 for(n = 0; n < nnl; n++)
1062 add_text("\n", 1);
1064 /* To make sure there is room and termination (see below) */
1065 add_text(" \0", 2);
1067 /* Strip trailing whitespace from expansion */
1068 for(k = curdef_idx, cptr = &curdef_text[curdef_idx-1]; k > 0; k--, cptr--)
1069 {
1070 if(!isspace(*cptr & 0xff))
1071 break;
1072 }
1074 /*
1075 * We must add *one* whitespace to make sure that there
1076 * is a token-separation after the expansion.
1077 */
1078 *(++cptr) = ' ';
1079 *(++cptr) = '\0';
1080 k++;
1082 /* Strip leading whitespace from expansion */
1083 for(n = 0, cptr = curdef_text; n < k; n++, cptr++)
1084 {
1085 if(!isspace(*cptr & 0xff))
1086 break;
1087 }
1089 if(k - n > 0)
1090 {
1091 if(pp_flex_debug)
1092 fprintf(stderr, "expand_text: '%s'\n", curdef_text + n);
1093 push_buffer(ppp, NULL, NULL, 0);
1094 /*yy_scan_bytes(curdef_text + n, k - n);*/
1095 yy_scan_string(curdef_text + n);
1096 }
1097 }
1099 /*
1100 *-------------------------------------------------------------------------
1101 * String collection routines
1102 *-------------------------------------------------------------------------
1103 */
1104 static void new_string(void)
1105 {
1106 #ifdef DEBUG
1107 if(strbuf_idx)
1108 ppwarning("new_string: strbuf_idx != 0");
1109 #endif
1110 strbuf_idx = 0;
1111 str_startline = pp_status.line_number;
1112 }
1114 static void add_string(const char *str, int len)
1115 {
1116 if(len == 0)
1117 return;
1118 if(strbuf_idx >= strbuf_alloc || strbuf_alloc - strbuf_idx < len)
1119 {
1120 strbuf_alloc += (len + ALLOCBLOCKSIZE-1) & ~(ALLOCBLOCKSIZE-1);
1121 strbuffer = pp_xrealloc(strbuffer, strbuf_alloc * sizeof(strbuffer[0]));
1122 if(strbuf_alloc > 65536)
1123 ppwarning("Reallocating string buffer larger than 64kB");
1124 }
1125 memcpy(&strbuffer[strbuf_idx], str, len);
1126 strbuf_idx += len;
1127 }
1129 static char *get_string(void)
1130 {
1131 char *str = pp_xmalloc(strbuf_idx + 1);
1132 memcpy(str, strbuffer, strbuf_idx);
1133 str[strbuf_idx] = '\0';
1134 #ifdef DEBUG
1135 strbuf_idx = 0;
1136 #endif
1137 return str;
1138 }
1140 static void put_string(void)
1141 {
1142 put_buffer(strbuffer, strbuf_idx);
1143 #ifdef DEBUG
1144 strbuf_idx = 0;
1145 #endif
1146 }
1148 static int string_start(void)
1149 {
1150 return str_startline;
1151 }
1154 /*
1155 *-------------------------------------------------------------------------
1156 * Buffer management
1157 *-------------------------------------------------------------------------
1158 */
1159 static void push_buffer(pp_entry_t *ppp, char *filename, char *incname, int pop)
1160 {
1161 if(ppdebug)
1162 printf("push_buffer(%d): %p %p %p %d\n", bufferstackidx, ppp, filename, incname, pop);
1163 if(bufferstackidx >= MAXBUFFERSTACK)
1164 pp_internal_error(__FILE__, __LINE__, "Buffer stack overflow");
1166 memset(&bufferstack[bufferstackidx], 0, sizeof(bufferstack[0]));
1167 bufferstack[bufferstackidx].bufferstate = YY_CURRENT_BUFFER;
1168 bufferstack[bufferstackidx].define = ppp;
1169 bufferstack[bufferstackidx].line_number = pp_status.line_number;
1170 bufferstack[bufferstackidx].char_number = pp_status.char_number;
1171 bufferstack[bufferstackidx].if_depth = pp_get_if_depth();
1172 bufferstack[bufferstackidx].should_pop = pop;
1173 bufferstack[bufferstackidx].filename = pp_status.input;
1174 bufferstack[bufferstackidx].ncontinuations = ncontinuations;
1175 bufferstack[bufferstackidx].incl = pp_incl_state;
1176 bufferstack[bufferstackidx].include_filename = incname;
1177 bufferstack[bufferstackidx].pass_data = pass_data;
1179 if(ppp)
1180 ppp->expanding = 1;
1181 else if(filename)
1182 {
1183 /* These will track the pperror to the correct file and line */
1184 pp_status.line_number = 1;
1185 pp_status.char_number = 1;
1186 pp_status.input = filename;
1187 ncontinuations = 0;
1188 }
1189 else if(!pop)
1190 pp_internal_error(__FILE__, __LINE__, "Pushing buffer without knowing where to go to");
1191 bufferstackidx++;
1192 }
1194 static bufferstackentry_t *pop_buffer(void)
1195 {
1196 if(bufferstackidx < 0)
1197 pp_internal_error(__FILE__, __LINE__, "Bufferstack underflow?");
1199 if(bufferstackidx == 0)
1200 return NULL;
1202 bufferstackidx--;
1204 if(bufferstack[bufferstackidx].define)
1205 bufferstack[bufferstackidx].define->expanding = 0;
1206 else
1207 {
1208 pp_status.line_number = bufferstack[bufferstackidx].line_number;
1209 pp_status.char_number = bufferstack[bufferstackidx].char_number;
1210 pp_status.input = bufferstack[bufferstackidx].filename;
1211 ncontinuations = bufferstack[bufferstackidx].ncontinuations;
1212 if(!bufferstack[bufferstackidx].should_pop)
1213 {
1214 fclose(ppin);
1215 fprintf(ppout, "# %d \"%s\" 2\n", pp_status.line_number, pp_status.input);
1217 /* We have EOF, check the include logic */
1218 if(pp_incl_state.state == 2 && !pp_incl_state.seen_junk && pp_incl_state.ppp)
1219 {
1220 pp_entry_t *ppp = pplookup(pp_incl_state.ppp);
1221 if(ppp)
1222 {
1223 includelogicentry_t *iep = pp_xmalloc(sizeof(includelogicentry_t));
1224 iep->ppp = ppp;
1225 ppp->iep = iep;
1226 iep->filename = bufferstack[bufferstackidx].include_filename;
1227 iep->prev = NULL;
1228 iep->next = pp_includelogiclist;
1229 if(iep->next)
1230 iep->next->prev = iep;
1231 pp_includelogiclist = iep;
1232 if(pp_status.debug)
1233 fprintf(stderr, "pop_buffer: %s:%d: includelogic added, include_ppp='%s', file='%s'\n", pp_status.input, pp_status.line_number, pp_incl_state.ppp, iep->filename);
1234 }
1235 else if(bufferstack[bufferstackidx].include_filename)
1236 free(bufferstack[bufferstackidx].include_filename);
1237 }
1238 if(pp_incl_state.ppp)
1239 free(pp_incl_state.ppp);
1240 pp_incl_state = bufferstack[bufferstackidx].incl;
1241 pass_data = bufferstack[bufferstackidx].pass_data;
1243 }
1244 }
1246 if(ppdebug)
1247 printf("pop_buffer(%d): %p %p (%d, %d, %d) %p %d\n",
1248 bufferstackidx,
1249 bufferstack[bufferstackidx].bufferstate,
1250 bufferstack[bufferstackidx].define,
1251 bufferstack[bufferstackidx].line_number,
1252 bufferstack[bufferstackidx].char_number,
1253 bufferstack[bufferstackidx].if_depth,
1254 bufferstack[bufferstackidx].filename,
1255 bufferstack[bufferstackidx].should_pop);
1257 pp_switch_to_buffer(bufferstack[bufferstackidx].bufferstate);
1259 if(bufferstack[bufferstackidx].should_pop)
1260 {
1261 if(yy_current_state() == pp_macexp)
1262 macro_add_expansion();
1263 else
1264 pp_internal_error(__FILE__, __LINE__, "Pop buffer and state without macro expansion state");
1265 yy_pop_state();
1266 }
1268 return &bufferstack[bufferstackidx];
1269 }
1272 /*
1273 *-------------------------------------------------------------------------
1274 * Macro nestng support
1275 *-------------------------------------------------------------------------
1276 */
1277 static void push_macro(pp_entry_t *ppp)
1278 {
1279 if(macexpstackidx >= MAXMACEXPSTACK)
1280 pperror("Too many nested macros");
1282 macexpstack[macexpstackidx] = pp_xmalloc(sizeof(macexpstack[0][0]));
1283 memset( macexpstack[macexpstackidx], 0, sizeof(macexpstack[0][0]));
1284 macexpstack[macexpstackidx]->ppp = ppp;
1285 macexpstackidx++;
1286 }
1288 static macexpstackentry_t *top_macro(void)
1289 {
1290 return macexpstackidx > 0 ? macexpstack[macexpstackidx-1] : NULL;
1291 }
1293 static macexpstackentry_t *pop_macro(void)
1294 {
1295 if(macexpstackidx <= 0)
1296 pp_internal_error(__FILE__, __LINE__, "Macro expansion stack underflow\n");
1297 return macexpstack[--macexpstackidx];
1298 }
1300 static void free_macro(macexpstackentry_t *mep)
1301 {
1302 int i;
1304 for(i = 0; i < mep->nargs; i++)
1305 free(mep->args[i]);
1306 if(mep->args)
1307 free(mep->args);
1308 if(mep->nnls)
1309 free(mep->nnls);
1310 if(mep->curarg)
1311 free(mep->curarg);
1312 free(mep);
1313 }
1315 static void add_text_to_macro(const char *text, int len)
1316 {
1317 macexpstackentry_t *mep = top_macro();
1319 assert(mep->ppp->expanding == 0);
1321 if(mep->curargalloc - mep->curargsize <= len+1) /* +1 for '\0' */
1322 {
1323 mep->curargalloc += (ALLOCBLOCKSIZE > len+1) ? ALLOCBLOCKSIZE : len+1;
1324 mep->curarg = pp_xrealloc(mep->curarg, mep->curargalloc * sizeof(mep->curarg[0]));
1325 }
1326 memcpy(mep->curarg + mep->curargsize, text, len);
1327 mep->curargsize += len;
1328 mep->curarg[mep->curargsize] = '\0';
1329 }
1331 static void macro_add_arg(int last)
1332 {
1333 int nnl = 0;
1334 char *cptr;
1335 macexpstackentry_t *mep = top_macro();
1337 assert(mep->ppp->expanding == 0);
1339 mep->args = pp_xrealloc(mep->args, (mep->nargs+1) * sizeof(mep->args[0]));
1340 mep->ppargs = pp_xrealloc(mep->ppargs, (mep->nargs+1) * sizeof(mep->ppargs[0]));
1341 mep->nnls = pp_xrealloc(mep->nnls, (mep->nargs+1) * sizeof(mep->nnls[0]));
1342 mep->args[mep->nargs] = pp_xstrdup(mep->curarg ? mep->curarg : "");
1343 cptr = mep->args[mep->nargs]-1;
1344 while((cptr = strchr(cptr+1, '\n')))
1345 {
1346 nnl++;
1347 }
1348 mep->nnls[mep->nargs] = nnl;
1349 mep->nargs++;
1350 free(mep->curarg);
1351 mep->curargalloc = mep->curargsize = 0;
1352 mep->curarg = NULL;
1354 if(pp_flex_debug)
1355 fprintf(stderr, "macro_add_arg: %s:%d: %d -> '%s'\n",
1356 pp_status.input,
1357 pp_status.line_number,
1358 mep->nargs-1,
1359 mep->args[mep->nargs-1]);
1361 /* Each macro argument must be expanded to cope with stingize */
1362 if(last || mep->args[mep->nargs-1][0])
1363 {
1364 yy_push_state(pp_macexp);
1365 push_buffer(NULL, NULL, NULL, last ? 2 : 1);
1366 yy_scan_string(mep->args[mep->nargs-1]);
1367 /*mep->bufferstackidx = bufferstackidx; But not nested! */
1368 }
1369 }
1371 static void macro_add_expansion(void)
1372 {
1373 macexpstackentry_t *mep = top_macro();
1375 assert(mep->ppp->expanding == 0);
1377 mep->ppargs[mep->nargs-1] = pp_xstrdup(mep->curarg ? mep->curarg : "");
1378 free(mep->curarg);
1379 mep->curargalloc = mep->curargsize = 0;
1380 mep->curarg = NULL;
1382 if(pp_flex_debug)
1383 fprintf(stderr, "macro_add_expansion: %s:%d: %d -> '%s'\n",
1384 pp_status.input,
1385 pp_status.line_number,
1386 mep->nargs-1,
1387 mep->ppargs[mep->nargs-1]);
1388 }
1391 /*
1392 *-------------------------------------------------------------------------
1393 * Output management
1394 *-------------------------------------------------------------------------
1395 */
1396 static void put_buffer(const char *s, int len)
1397 {
1398 if(top_macro())
1399 add_text_to_macro(s, len);
1400 else {
1401 if(pass_data)
1402 fwrite(s, 1, len, ppout);
1403 }
1404 }
1407 /*
1408 *-------------------------------------------------------------------------
1409 * Include management
1410 *-------------------------------------------------------------------------
1411 */
1412 static int is_c_h_include(char *fname, int quoted)
1413 {
1414 int sl=strlen(fname);
1415 if (sl < 2 + 2 * quoted) return 0;
1416 if ((toupper(fname[sl-1-quoted])!='H') && (toupper(fname[sl-1-quoted])!='C')) return 0;
1417 if (fname[sl-2-quoted]!='.') return 0;
1418 return 1;
1419 }
1421 void pp_do_include(char *fname, int type)
1422 {
1423 char *newpath;
1424 int n;
1425 includelogicentry_t *iep;
1427 for(iep = pp_includelogiclist; iep; iep = iep->next)
1428 {
1429 if(!strcmp(iep->filename, fname))
1430 {
1431 /*
1432 * We are done. The file was included before.
1433 * If the define was deleted, then this entry would have
1434 * been deleted too.
1435 */
1436 return;
1437 }
1438 }
1440 n = strlen(fname);
1442 if(n <= 2)
1443 pperror("Empty include filename");
1445 /* Undo the effect of the quotation */
1446 fname[n-1] = '\0';
1448 if((ppin = pp_open_include(fname+1, type ? pp_status.input : NULL, &newpath)) == NULL)
1449 pperror("Unable to open include file %s", fname+1);
1451 fname[n-1] = *fname; /* Redo the quotes */
1452 push_buffer(NULL, newpath, fname, 0);
1453 pp_incl_state.seen_junk = 0;
1454 pp_incl_state.state = 0;
1455 pp_incl_state.ppp = NULL;
1456 if (is_c_h_include(newpath, 0)) pass_data=0;
1457 else pass_data=1;
1459 if(pp_status.debug)
1460 fprintf(stderr, "pp_do_include: %s:%d: include_state=%d, include_ppp='%s', include_ifdepth=%d ,pass_data=%d\n",
1461 pp_status.input, pp_status.line_number, pp_incl_state.state, pp_incl_state.ppp, pp_incl_state.ifdepth, pass_data);
1462 pp_switch_to_buffer(pp_create_buffer(ppin, YY_BUF_SIZE));
1464 fprintf(ppout, "# 1 \"%s\" 1%s\n", newpath, type ? "" : " 3");
1465 }
1467 /*
1468 *-------------------------------------------------------------------------
1469 * Push/pop preprocessor ignore state when processing conditionals
1470 * which are false.
1471 *-------------------------------------------------------------------------
1472 */
1473 void pp_push_ignore_state(void)
1474 {
1475 yy_push_state(pp_ignore);
1476 }
1478 void pp_pop_ignore_state(void)
1479 {
1480 yy_pop_state();
1481 }