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   1 /*
   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 grammer 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  */
 123
 124 /*
 125  * Special flex options and exclusive scanner start-conditions
 126  */
 127 %option stack
 128 %option never-interactive
 129
 130 %x pp_pp
 131 %x pp_eol
 132 %x pp_inc
 133 %x pp_dqs
 134 %x pp_sqs
 135 %x pp_iqs
 136 %x pp_comment
 137 %x pp_def
 138 %x pp_define
 139 %x pp_macro
 140 %x pp_mbody
 141 %x pp_macign
 142 %x pp_macscan
 143 %x pp_macexp
 144 %x pp_if
 145 %x pp_ifd
 146 %x pp_endif
 147 %x pp_line
 148 %x pp_defined
 149 %x pp_ignore
 150 %x RCINCL
 151
 152 ws      [ \v\f\t\r]
 153 cident  [a-zA-Z_][0-9a-zA-Z_]*
 154 ul      [uUlL]|[uUlL][lL]|[lL][uU]|[lL][lL][uU]|[uU][lL][lL]|[lL][uU][lL]
 155
 156 %{
 157 #include <stdio.h>
 158 #include <stdlib.h>
 159 #include <string.h>
 160 #include <ctype.h>
 161 #include <assert.h>
 162
 163 #include "wpp_private.h"
 164 #include "y.tab.h"
 165
 166 /*
 167  * Make sure that we are running an appropriate version of flex.
 168  */
 169 #if !defined(YY_FLEX_MAJOR_VERSION) || (1000 * YY_FLEX_MAJOR_VERSION + YY_FLEX_MINOR_VERSION < 2005)
 170 #error Must use flex version 2.5.1 or higher (yy_scan_* routines are required).
 171 #endif
 172
 173 #define YY_USE_PROTOS
 174 #define YY_NO_UNPUT
 175 #define YY_READ_BUF_SIZE        65536           /* So we read most of a file at once */
 176
 177 #define yy_current_state()      YY_START
 178 #define yy_pp_state(x)          yy_pop_state(); yy_push_state(x)
 179
 180 /*
 181  * Always update the current character position within a line
 182  */
 183 #define YY_USER_ACTION  pp_status.char_number+=ppleng;
 184
 185 /*
 186  * Buffer management for includes and expansions
 187  */
 188 #define MAXBUFFERSTACK  128     /* Nesting more than 128 includes or macro expansion textss is insane */
 189
 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;
 204
 205 #define ALLOCBLOCKSIZE  (1 << 10)       /* Allocate these chunks at a time for string-buffers */
 206
 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 */
 214
 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;
 226
 227 #define MACROPARENTHESES()      (top_macro()->parentheses)
 228
 229 /*
 230  * Prototypes
 231  */
 232 static void newline(int);
 233 static int make_number(int radix, YYSTYPE *val, char *str, int len);
 234 static void put_buffer(char *s, int len);
 235 /* Buffer management */
 236 static void push_buffer(pp_entry_t *ppp, char *filename, char *incname, int pop);
 237 static bufferstackentry_t *pop_buffer(void);
 238 /* String functions */
 239 static void new_string(void);
 240 static void add_string(char *str, int len);
 241 static char *get_string(void);
 242 static void put_string(void);
 243 static int string_start(void);
 244 /* Macro functions */
 245 static void push_macro(pp_entry_t *ppp);
 246 static macexpstackentry_t *top_macro(void);
 247 static macexpstackentry_t *pop_macro(void);
 248 static void free_macro(macexpstackentry_t *mep);
 249 static void add_text_to_macro(char *text, int len);
 250 static void macro_add_arg(int last);
 251 static void macro_add_expansion(void);
 252 /* Expansion */
 253 static void expand_special(pp_entry_t *ppp);
 254 static void expand_define(pp_entry_t *ppp);
 255 static void expand_macro(macexpstackentry_t *mep);
 256
 257 /*
 258  * Local variables
 259  */
 260 static int ncontinuations;
 261
 262 static int strbuf_idx = 0;
 263 static int strbuf_alloc = 0;
 264 static char *strbuffer = NULL;
 265 static int str_startline;
 266
 267 static macexpstackentry_t *macexpstack[MAXMACEXPSTACK];
 268 static int macexpstackidx = 0;
 269
 270 static bufferstackentry_t bufferstack[MAXBUFFERSTACK];
 271 static int bufferstackidx = 0;
 272
 273 static int pass_data=1;
 274
 275 /*
 276  * Global variables
 277  */
 278 include_state_t pp_incl_state =
 279 {
 280     -1,    /* state */
 281     NULL,  /* ppp */
 282     0,     /* ifdepth */
 283     0      /* seen_junk */
 284 };
 285
 286 includelogicentry_t *pp_includelogiclist = NULL;
 287
 288 %}
 289
 290 /*
 291  **************************************************************************
 292  * The scanner starts here
 293  **************************************************************************
 294  */
 295
 296 %%
 297         /*
 298          * Catch line-continuations.
 299          * Note: Gcc keeps the line-continuations in, for example, strings
 300          * intact. However, I prefer to remove them all so that the next
 301          * scanner will not need to reduce the continuation state.
 302          *
 303          * <*>\\\n              newline(0);
 304          */
 305
 306         /*
 307          * Detect the leading # of a preprocessor directive.
 308          */
 309 <INITIAL,pp_ignore>^{ws}*#      pp_incl_state.seen_junk++; yy_push_state(pp_pp);
 310
 311         /*
 312          * Scan for the preprocessor directives
 313          */
 314 <pp_pp>{ws}*include{ws}*        if(yy_top_state() != pp_ignore) {yy_pp_state(pp_inc); return tINCLUDE;} else {yy_pp_state(pp_eol);}
 315 <pp_pp>{ws}*define{ws}*         yy_pp_state(yy_current_state() != pp_ignore ? pp_def : pp_eol);
 316 <pp_pp>{ws}*error{ws}*          yy_pp_state(pp_eol);    if(yy_top_state() != pp_ignore) return tERROR;
 317 <pp_pp>{ws}*warning{ws}*        yy_pp_state(pp_eol);    if(yy_top_state() != pp_ignore) return tWARNING;
 318 <pp_pp>{ws}*pragma{ws}*         yy_pp_state(pp_eol);    if(yy_top_state() != pp_ignore) return tPRAGMA;
 319 <pp_pp>{ws}*ident{ws}*          yy_pp_state(pp_eol);    if(yy_top_state() != pp_ignore) return tPPIDENT;
 320 <pp_pp>{ws}*undef{ws}*          if(yy_top_state() != pp_ignore) {yy_pp_state(pp_ifd); return tUNDEF;} else {yy_pp_state(pp_eol);}
 321 <pp_pp>{ws}*ifdef{ws}*          yy_pp_state(pp_ifd);    return tIFDEF;
 322 <pp_pp>{ws}*ifndef{ws}*         pp_incl_state.seen_junk--; yy_pp_state(pp_ifd); return tIFNDEF;
 323 <pp_pp>{ws}*if{ws}*             yy_pp_state(pp_if);     return tIF;
 324 <pp_pp>{ws}*elif{ws}*           yy_pp_state(pp_if);     return tELIF;
 325 <pp_pp>{ws}*else{ws}*           yy_pp_state(pp_endif);  return tELSE;
 326 <pp_pp>{ws}*endif{ws}*          yy_pp_state(pp_endif);  return tENDIF;
 327 <pp_pp>{ws}*line{ws}*           if(yy_top_state() != pp_ignore) {yy_pp_state(pp_line); return tLINE;} else {yy_pp_state(pp_eol);}
 328 <pp_pp>{ws}+                    if(yy_top_state() != pp_ignore) {yy_pp_state(pp_line); return tGCCLINE;} else {yy_pp_state(pp_eol);}
 329 <pp_pp>{ws}*[a-z]+              pperror("Invalid preprocessor token '%s'", pptext);
 330 <pp_pp>\r?\n                    newline(1); yy_pop_state(); return tNL; /* This could be the null-token */
 331 <pp_pp>\\\r?\n                  newline(0);
 332 <pp_pp>\\\r?                    pperror("Preprocessor junk '%s'", pptext);
 333 <pp_pp>.                        return *pptext;
 334
 335         /*
 336          * Handle #include and #line
 337          */
 338 <pp_line>[0-9]+                 return make_number(10, &pplval, pptext, ppleng);
 339 <pp_inc>\<                      new_string(); add_string(pptext, ppleng); yy_push_state(pp_iqs);
 340 <pp_inc,pp_line>\"              new_string(); add_string(pptext, ppleng); yy_push_state(pp_dqs);
 341 <pp_inc,pp_line>{ws}+           ;
 342 <pp_inc,pp_line>\n              newline(1); yy_pop_state(); return tNL;
 343 <pp_inc,pp_line>\\\r?\n         newline(0);
 344 <pp_inc,pp_line>(\\\r?)|(.)     pperror(yy_current_state() == pp_inc ? "Trailing junk in #include" : "Trailing junk in #line");
 345
 346         /*
 347          * Ignore all input when a false clause is parsed
 348          */
 349 <pp_ignore>[^#/\\\n]+           ;
 350 <pp_ignore>\n                   newline(1);
 351 <pp_ignore>\\\r?\n              newline(0);
 352 <pp_ignore>(\\\r?)|(.)          ;
 353
 354         /*
 355          * Handle #if and #elif.
 356          * These require conditionals to be evaluated, but we do not
 357          * want to jam the scanner normally when we see these tokens.
 358          * Note: tIDENT is handled below.
 359          */
 360
 361 <pp_if>0[0-7]*{ul}?             return make_number(8, &pplval, pptext, ppleng);
 362 <pp_if>0[0-7]*[8-9]+{ul}?       pperror("Invalid octal digit");
 363 <pp_if>[1-9][0-9]*{ul}?         return make_number(10, &pplval, pptext, ppleng);
 364 <pp_if>0[xX][0-9a-fA-F]+{ul}?   return make_number(16, &pplval, pptext, ppleng);
 365 <pp_if>0[xX]                    pperror("Invalid hex number");
 366 <pp_if>defined                  yy_push_state(pp_defined); return tDEFINED;
 367 <pp_if>"<<"                     return tLSHIFT;
 368 <pp_if>">>"                     return tRSHIFT;
 369 <pp_if>"&&"                     return tLOGAND;
 370 <pp_if>"||"                     return tLOGOR;
 371 <pp_if>"=="                     return tEQ;
 372 <pp_if>"!="                     return tNE;
 373 <pp_if>"<="                     return tLTE;
 374 <pp_if>">="                     return tGTE;
 375 <pp_if>\n                       newline(1); yy_pop_state(); return tNL;
 376 <pp_if>\\\r?\n                  newline(0);
 377 <pp_if>\\\r?                    pperror("Junk in conditional expression");
 378 <pp_if>{ws}+                    ;
 379 <pp_if>\'                       new_string(); add_string(pptext, ppleng); yy_push_state(pp_sqs);
 380 <pp_if>\"                       pperror("String constants not allowed in conditionals");
 381 <pp_if>.                        return *pptext;
 382
 383         /*
 384          * Handle #ifdef, #ifndef and #undef
 385          * to get only an untranslated/unexpanded identifier
 386          */
 387 <pp_ifd>{cident}        pplval.cptr = pp_xstrdup(pptext); return tIDENT;
 388 <pp_ifd>{ws}+           ;
 389 <pp_ifd>\n              newline(1); yy_pop_state(); return tNL;
 390 <pp_ifd>\\\r?\n         newline(0);
 391 <pp_ifd>(\\\r?)|(.)     pperror("Identifier expected");
 392
 393         /*
 394          * Handle #else and #endif.
 395          */
 396 <pp_endif>{ws}+         ;
 397 <pp_endif>\n            newline(1); yy_pop_state(); return tNL;
 398 <pp_endif>\\\r?\n       newline(0);
 399 <pp_endif>.             pperror("Garbage after #else or #endif.");
 400
 401         /*
 402          * Handle the special 'defined' keyword.
 403          * This is necessary to get the identifier prior to any
 404          * substitutions.
 405          */
 406 <pp_defined>{cident}            yy_pop_state(); pplval.cptr = pp_xstrdup(pptext); return tIDENT;
 407 <pp_defined>{ws}+               ;
 408 <pp_defined>(\()|(\))           return *pptext;
 409 <pp_defined>\\\r?\n             newline(0);
 410 <pp_defined>(\\.)|(\n)|(.)      pperror("Identifier expected");
 411
 412         /*
 413          * Handle #error, #warning, #pragma and #ident.
 414          * Pass everything literally to the parser, which
 415          * will act appropriately.
 416          * Comments are stripped from the literal text.
 417          */
 418 <pp_eol>[^/\\\n]+               if(yy_top_state() != pp_ignore) { pplval.cptr = pp_xstrdup(pptext); return tLITERAL; }
 419 <pp_eol>\/[^/\\\n*]*            if(yy_top_state() != pp_ignore) { pplval.cptr = pp_xstrdup(pptext); return tLITERAL; }
 420 <pp_eol>(\\\r?)|(\/[^/*])       if(yy_top_state() != pp_ignore) { pplval.cptr = pp_xstrdup(pptext); return tLITERAL; }
 421 <pp_eol>\n                      newline(1); yy_pop_state(); if(yy_current_state() != pp_ignore) { return tNL; }
 422 <pp_eol>\\\r?\n                 newline(0);
 423
 424         /*
 425          * Handle left side of #define
 426          */
 427 <pp_def>{cident}\(              pplval.cptr = pp_xstrdup(pptext); pplval.cptr[ppleng-1] = '\0'; yy_pp_state(pp_macro);  return tMACRO;
 428 <pp_def>{cident}                pplval.cptr = pp_xstrdup(pptext); yy_pp_state(pp_define); return tDEFINE;
 429 <pp_def>{ws}+                   ;
 430 <pp_def>\\\r?\n                 newline(0);
 431 <pp_def>(\\\r?)|(\n)|(.)        perror("Identifier expected");
 432
 433         /*
 434          * Scan the substitution of a define
 435          */
 436 <pp_define>[^'"/\\\n]+          pplval.cptr = pp_xstrdup(pptext); return tLITERAL;
 437 <pp_define>(\\\r?)|(\/[^/*])    pplval.cptr = pp_xstrdup(pptext); return tLITERAL;
 438 <pp_define>\\\r?\n{ws}+         newline(0); pplval.cptr = pp_xstrdup(" "); return tLITERAL;
 439 <pp_define>\\\r?\n              newline(0);
 440 <pp_define>\n                   newline(1); yy_pop_state(); return tNL;
 441 <pp_define>\'                   new_string(); add_string(pptext, ppleng); yy_push_state(pp_sqs);
 442 <pp_define>\"                   new_string(); add_string(pptext, ppleng); yy_push_state(pp_dqs);
 443
 444         /*
 445          * Scan the definition macro arguments
 446          */
 447 <pp_macro>\){ws}*               yy_pp_state(pp_mbody); return tMACROEND;
 448 <pp_macro>{ws}+                 ;
 449 <pp_macro>{cident}              pplval.cptr = pp_xstrdup(pptext); return tIDENT;
 450 <pp_macro>,                     return ',';
 451 <pp_macro>"..."                 return tELIPSIS;
 452 <pp_macro>(\\\r?)|(\n)|(.)|(\.\.?)      pperror("Argument identifier expected");
 453 <pp_macro>\\\r?\n               newline(0);
 454
 455         /*
 456          * Scan the substitution of a macro
 457          */
 458 <pp_mbody>[^a-zA-Z0-9'"#/\\\n]+ pplval.cptr = pp_xstrdup(pptext); return tLITERAL;
 459 <pp_mbody>{cident}              pplval.cptr = pp_xstrdup(pptext); return tIDENT;
 460 <pp_mbody>\#\#                  return tCONCAT;
 461 <pp_mbody>\#                    return tSTRINGIZE;
 462 <pp_mbody>[0-9][^'"#/\\\n]*     pplval.cptr = pp_xstrdup(pptext); return tLITERAL;
 463 <pp_mbody>(\\\r?)|(\/[^/*'"#\\\n]*)     pplval.cptr = pp_xstrdup(pptext); return tLITERAL;
 464 <pp_mbody>\\\r?\n{ws}+          newline(0); pplval.cptr = pp_xstrdup(" "); return tLITERAL;
 465 <pp_mbody>\\\r?\n               newline(0);
 466 <pp_mbody>\n                    newline(1); yy_pop_state(); return tNL;
 467 <pp_mbody>\'                    new_string(); add_string(pptext, ppleng); yy_push_state(pp_sqs);
 468 <pp_mbody>\"                    new_string(); add_string(pptext, ppleng); yy_push_state(pp_dqs);
 469
 470         /*
 471          * Macro expansion text scanning.
 472          * This state is active just after the identifier is scanned
 473          * that triggers an expansion. We *must* delete the leading
 474          * whitespace before we can start scanning for arguments.
 475          *
 476          * If we do not see a '(' as next trailing token, then we have
 477          * a false alarm. We just continue with a nose-bleed...
 478          */
 479 <pp_macign>{ws}*/\(     yy_pp_state(pp_macscan);
 480 <pp_macign>{ws}*\n      {
 481                 if(yy_top_state() != pp_macscan)
 482                         newline(0);
 483         }
 484 <pp_macign>{ws}*\\\r?\n newline(0);
 485 <pp_macign>{ws}+|{ws}*\\\r?|.   {
 486                 macexpstackentry_t *mac = pop_macro();
 487                 yy_pop_state();
 488                 put_buffer(mac->ppp->ident, strlen(mac->ppp->ident));
 489                 put_buffer(pptext, ppleng);
 490                 free_macro(mac);
 491         }
 492
 493         /*
 494          * Macro expansion argument text scanning.
 495          * This state is active when a macro's arguments are being read for expansion.
 496          */
 497 <pp_macscan>\(  {
 498                 if(++MACROPARENTHESES() > 1)
 499                         add_text_to_macro(pptext, ppleng);
 500         }
 501 <pp_macscan>\)  {
 502                 if(--MACROPARENTHESES() == 0)
 503                 {
 504                         yy_pop_state();
 505                         macro_add_arg(1);
 506                 }
 507                 else
 508                         add_text_to_macro(pptext, ppleng);
 509         }
 510 <pp_macscan>,           {
 511                 if(MACROPARENTHESES() > 1)
 512                         add_text_to_macro(pptext, ppleng);
 513                 else
 514                         macro_add_arg(0);
 515         }
 516 <pp_macscan>\"          new_string(); add_string(pptext, ppleng); yy_push_state(pp_dqs);
 517 <pp_macscan>\'          new_string(); add_string(pptext, ppleng); yy_push_state(pp_sqs);
 518 <pp_macscan>"/*"        yy_push_state(pp_comment); add_text_to_macro(" ", 1);
 519 <pp_macscan>\n          pp_status.line_number++; pp_status.char_number = 1; add_text_to_macro(pptext, ppleng);
 520 <pp_macscan>([^/(),\\\n"']+)|(\/[^/*(),\\\n'"]*)|(\\\r?)|(.)    add_text_to_macro(pptext, ppleng);
 521 <pp_macscan>\\\r?\n     newline(0);
 522
 523         /*
 524          * Comment handling (almost all start-conditions)
 525          */
 526 <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);
 527 <pp_comment>[^*\n]*|"*"+[^*/\n]*        ;
 528 <pp_comment>\n                          newline(0);
 529 <pp_comment>"*"+"/"                     yy_pop_state();
 530
 531         /*
 532          * Remove C++ style comment (almost all start-conditions)
 533          */
 534 <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]* {
 535                 if(pptext[ppleng-1] == '\\')
 536                         ppwarning("C++ style comment ends with an escaped newline (escape ignored)");
 537         }
 538
 539         /*
 540          * Single, double and <> quoted constants
 541          */
 542 <INITIAL,pp_macexp>\"           pp_incl_state.seen_junk++; new_string(); add_string(pptext, ppleng); yy_push_state(pp_dqs);
 543 <INITIAL,pp_macexp>\'           pp_incl_state.seen_junk++; new_string(); add_string(pptext, ppleng); yy_push_state(pp_sqs);
 544 <pp_dqs>[^"\\\n]+               add_string(pptext, ppleng);
 545 <pp_dqs>\"                      {
 546                 add_string(pptext, ppleng);
 547                 yy_pop_state();
 548                 switch(yy_current_state())
 549                 {
 550                 case pp_pp:
 551                 case pp_define:
 552                 case pp_mbody:
 553                 case pp_inc:
 554                 case pp_line:
 555                 case RCINCL:
 556                         if (yy_current_state()==RCINCL) yy_pop_state();
 557                         pplval.cptr = get_string();
 558                         return tDQSTRING;
 559                 default:
 560                         put_string();
 561                 }
 562         }
 563 <pp_sqs>[^'\\\n]+               add_string(pptext, ppleng);
 564 <pp_sqs>\'                      {
 565                 add_string(pptext, ppleng);
 566                 yy_pop_state();
 567                 switch(yy_current_state())
 568                 {
 569                 case pp_if:
 570                 case pp_define:
 571                 case pp_mbody:
 572                         pplval.cptr = get_string();
 573                         return tSQSTRING;
 574                 default:
 575                         put_string();
 576                 }
 577         }
 578 <pp_iqs>[^\>\\\n]+              add_string(pptext, ppleng);
 579 <pp_iqs>\>                      {
 580                 add_string(pptext, ppleng);
 581                 yy_pop_state();
 582                 pplval.cptr = get_string();
 583                 return tIQSTRING;
 584         }
 585 <pp_dqs>\\\r?\n         {
 586                 /*
 587                  * This is tricky; we need to remove the line-continuation
 588                  * from preprocessor strings, but OTOH retain them in all
 589                  * other strings. This is because the resource grammar is
 590                  * even more braindead than initially analysed and line-
 591                  * continuations in strings introduce, sigh, newlines in
 592                  * the output. There goes the concept of non-breaking, non-
 593                  * spacing whitespace.
 594                  */
 595                 switch(yy_top_state())
 596                 {
 597                 case pp_pp:
 598                 case pp_define:
 599                 case pp_mbody:
 600                 case pp_inc:
 601                 case pp_line:
 602                         newline(0);
 603                         break;
 604                 default:
 605                         add_string(pptext, ppleng);
 606                         newline(-1);
 607                 }
 608         }
 609 <pp_iqs,pp_dqs,pp_sqs>\\.       add_string(pptext, ppleng);
 610 <pp_iqs,pp_dqs,pp_sqs>\n        {
 611                 newline(1);
 612                 add_string(pptext, ppleng);
 613                 ppwarning("Newline in string constant encounterd (started line %d)", string_start());
 614         }
 615
 616         /*
 617          * Identifier scanning
 618          */
 619 <INITIAL,pp_if,pp_inc,pp_macexp>{cident}        {
 620                 pp_entry_t *ppp;
 621                 pp_incl_state.seen_junk++;
 622                 if(!(ppp = pplookup(pptext)))
 623                 {
 624                         if(yy_current_state() == pp_inc)
 625                                 pperror("Expected include filename");
 626
 627                         if(yy_current_state() == pp_if)
 628                         {
 629                                 pplval.cptr = pp_xstrdup(pptext);
 630                                 return tIDENT;
 631                         }
 632                         else {
 633                                 if((yy_current_state()==INITIAL) && (strcasecmp(pptext,"RCINCLUDE")==0)){
 634                                         yy_push_state(RCINCL);
 635                                         return tRCINCLUDE;
 636                                 }
 637                                 else put_buffer(pptext, ppleng);
 638                         }
 639                 }
 640                 else if(!ppp->expanding)
 641                 {
 642                         switch(ppp->type)
 643                         {
 644                         case def_special:
 645                                 expand_special(ppp);
 646                                 break;
 647                         case def_define:
 648                                 expand_define(ppp);
 649                                 break;
 650                         case def_macro:
 651                                 yy_push_state(pp_macign);
 652                                 push_macro(ppp);
 653                                 break;
 654                         default:
 655                                 pp_internal_error(__FILE__, __LINE__, "Invalid define type %d\n", ppp->type);
 656                         }
 657                 }
 658         }
 659
 660         /*
 661          * Everything else that needs to be passed and
 662          * newline and continuation handling
 663          */
 664 <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);
 665 <INITIAL,pp_macexp>{ws}+        put_buffer(pptext, ppleng);
 666 <INITIAL>\n                     newline(1);
 667 <INITIAL>\\\r?\n                newline(0);
 668 <INITIAL>\\\r?                  pp_incl_state.seen_junk++; put_buffer(pptext, ppleng);
 669
 670         /*
 671          * Special catcher for macro argmument expansion to prevent
 672          * newlines to propagate to the output or admin.
 673          */
 674 <pp_macexp>(\n)|(.)|(\\\r?(\n|.))       put_buffer(pptext, ppleng);
 675
 676 <RCINCL>[A-Za-z0-9_\.\\/]+ {
 677                 pplval.cptr=pp_xstrdup(pptext);
 678                 yy_pop_state();
 679                 return tRCINCLUDEPATH;
 680         }
 681
 682 <RCINCL>{ws}+ ;
 683
 684 <RCINCL>\"              {
 685                 new_string(); add_string(pptext,ppleng);yy_push_state(pp_dqs);
 686         }
 687
 688         /*
 689          * This is a 'catch-all' rule to discover errors in the scanner
 690          * in an orderly manner.
 691          */
 692 <*>.            pp_incl_state.seen_junk++; ppwarning("Unmatched text '%c' (0x%02x); please report\n", isprint(*pptext & 0xff) ? *pptext : ' ', *pptext);
 693
 694 <<EOF>> {
 695                 YY_BUFFER_STATE b = YY_CURRENT_BUFFER;
 696                 bufferstackentry_t *bep = pop_buffer();
 697
 698                 if((!bep && pp_get_if_depth()) || (bep && pp_get_if_depth() != bep->if_depth))
 699                         ppwarning("Unmatched #if/#endif at end of file");
 700
 701                 if(!bep)
 702                 {
 703                         if(YY_START != INITIAL)
 704                                 pperror("Unexpected end of file during preprocessing");
 705                         yyterminate();
 706                 }
 707                 else if(bep->should_pop == 2)
 708                 {
 709                         macexpstackentry_t *mac;
 710                         mac = pop_macro();
 711                         expand_macro(mac);
 712                 }
 713                 pp_delete_buffer(b);
 714         }
 715
 716 %%
 717 /*
 718  **************************************************************************
 719  * Support functions
 720  **************************************************************************
 721  */
 722
 723 #ifndef ppwrap
 724 int ppwrap(void)
 725 {
 726         return 1;
 727 }
 728 #endif
 729
 730
 731 /*
 732  *-------------------------------------------------------------------------
 733  * Output newlines or set them as continuations
 734  *
 735  * Input: -1 - Don't count this one, but update local position (see pp_dqs)
 736  *         0 - Line-continuation seen and cache output
 737  *         1 - Newline seen and flush output
 738  *-------------------------------------------------------------------------
 739  */
 740 static void newline(int dowrite)
 741 {
 742         pp_status.line_number++;
 743         pp_status.char_number = 1;
 744
 745         if(dowrite == -1)
 746                 return;
 747
 748         ncontinuations++;
 749         if(dowrite)
 750         {
 751                 for(;ncontinuations; ncontinuations--)
 752                         put_buffer("\n", 1);
 753         }
 754 }
 755
 756
 757 /*
 758  *-------------------------------------------------------------------------
 759  * Make a number out of an any-base and suffixed string
 760  *
 761  * Possible number extensions:
 762  * - ""         int
 763  * - "L"        long int
 764  * - "LL"       long long int
 765  * - "U"        unsigned int
 766  * - "UL"       unsigned long int
 767  * - "ULL"      unsigned long long int
 768  * - "LU"       unsigned long int
 769  * - "LLU"      unsigned long long int
 770  * - "LUL"      invalid
 771  *
 772  * FIXME:
 773  * The sizes of resulting 'int' and 'long' are compiler specific.
 774  * I depend on sizeof(int) > 2 here (although a relatively safe
 775  * assumption).
 776  * Long longs are not yet implemented because this is very compiler
 777  * specific and I don't want to think too much about the problems.
 778  *
 779  *-------------------------------------------------------------------------
 780  */
 781 static int make_number(int radix, YYSTYPE *val, char *str, int len)
 782 {
 783         int is_l  = 0;
 784         int is_ll = 0;
 785         int is_u  = 0;
 786         char ext[4];
 787
 788         ext[3] = '\0';
 789         ext[2] = toupper(str[len-1]);
 790         ext[1] = len > 1 ? toupper(str[len-2]) : ' ';
 791         ext[0] = len > 2 ? toupper(str[len-3]) : ' ';
 792
 793         if(!strcmp(ext, "LUL"))
 794                 pperror("Invalid constant suffix");
 795         else if(!strcmp(ext, "LLU") || !strcmp(ext, "ULL"))
 796         {
 797                 is_ll++;
 798                 is_u++;
 799         }
 800         else if(!strcmp(ext+1, "LU") || !strcmp(ext+1, "UL"))
 801         {
 802                 is_l++;
 803                 is_u++;
 804         }
 805         else if(!strcmp(ext+1, "LL"))
 806         {
 807                 is_ll++;
 808         }
 809         else if(!strcmp(ext+2, "L"))
 810         {
 811                 is_l++;
 812         }
 813         else if(!strcmp(ext+2, "U"))
 814         {
 815                 is_u++;
 816         }
 817
 818         if(is_ll)
 819                 pp_internal_error(__FILE__, __LINE__, "long long constants not implemented yet");
 820
 821         if(is_u && is_l)
 822         {
 823                 val->ulong = strtoul(str, NULL, radix);
 824                 return tULONG;
 825         }
 826         else if(!is_u && is_l)
 827         {
 828                 val->slong = strtol(str, NULL, radix);
 829                 return tSLONG;
 830         }
 831         else if(is_u && !is_l)
 832         {
 833                 val->uint = (unsigned int)strtoul(str, NULL, radix);
 834                 return tUINT;
 835         }
 836
 837         /* Else it must be an int... */
 838         val->sint = (int)strtol(str, NULL, radix);
 839         return tSINT;
 840 }
 841
 842
 843 /*
 844  *-------------------------------------------------------------------------
 845  * Macro and define expansion support
 846  *
 847  * FIXME: Variable macro arguments.
 848  *-------------------------------------------------------------------------
 849  */
 850 static void expand_special(pp_entry_t *ppp)
 851 {
 852         char *dbgtext = "?";
 853         static char *buf = NULL;
 854
 855         assert(ppp->type == def_special);
 856
 857         if(!strcmp(ppp->ident, "__LINE__"))
 858         {
 859                 dbgtext = "def_special(__LINE__)";
 860                 buf = pp_xrealloc(buf, 32);
 861                 sprintf(buf, "%d", pp_status.line_number);
 862         }
 863         else if(!strcmp(ppp->ident, "__FILE__"))
 864         {
 865                 dbgtext = "def_special(__FILE__)";
 866                 buf = pp_xrealloc(buf, strlen(pp_status.input) + 3);
 867                 sprintf(buf, "\"%s\"", pp_status.input);
 868         }
 869         else
 870                 pp_internal_error(__FILE__, __LINE__, "Special macro '%s' not found...\n", ppp->ident);
 871
 872         if(pp_flex_debug)
 873                 fprintf(stderr, "expand_special(%d): %s:%d: '%s' -> '%s'\n",
 874                         macexpstackidx,
 875                         pp_status.input,
 876                         pp_status.line_number,
 877                         ppp->ident,
 878                         buf ? buf : "");
 879
 880         if(buf && buf[0])
 881         {
 882                 push_buffer(ppp, NULL, NULL, 0);
 883                 yy_scan_string(buf);
 884         }
 885 }
 886
 887 static void expand_define(pp_entry_t *ppp)
 888 {
 889         assert(ppp->type == def_define);
 890
 891         if(pp_flex_debug)
 892                 fprintf(stderr, "expand_define(%d): %s:%d: '%s' -> '%s'\n",
 893                         macexpstackidx,
 894                         pp_status.input,
 895                         pp_status.line_number,
 896                         ppp->ident,
 897                         ppp->subst.text);
 898         if(ppp->subst.text && ppp->subst.text[0])
 899         {
 900                 push_buffer(ppp, NULL, NULL, 0);
 901                 yy_scan_string(ppp->subst.text);
 902         }
 903 }
 904
 905 static int curdef_idx = 0;
 906 static int curdef_alloc = 0;
 907 static char *curdef_text = NULL;
 908
 909 static void add_text(char *str, int len)
 910 {
 911         if(len == 0)
 912                 return;
 913         if(curdef_idx >= curdef_alloc || curdef_alloc - curdef_idx < len)
 914         {
 915                 curdef_alloc += (len + ALLOCBLOCKSIZE-1) & ~(ALLOCBLOCKSIZE-1);
 916                 curdef_text = pp_xrealloc(curdef_text, curdef_alloc * sizeof(curdef_text[0]));
 917                 if(curdef_alloc > 65536)
 918                         ppwarning("Reallocating macro-expansion buffer larger than 64kB");
 919         }
 920         memcpy(&curdef_text[curdef_idx], str, len);
 921         curdef_idx += len;
 922 }
 923
 924 static mtext_t *add_expand_text(mtext_t *mtp, macexpstackentry_t *mep, int *nnl)
 925 {
 926         char *cptr;
 927         char *exp;
 928         int tag;
 929         int n;
 930
 931         if(mtp == NULL)
 932                 return NULL;
 933
 934         switch(mtp->type)
 935         {
 936         case exp_text:
 937                 if(pp_flex_debug)
 938                         fprintf(stderr, "add_expand_text: exp_text: '%s'\n", mtp->subst.text);
 939                 add_text(mtp->subst.text, strlen(mtp->subst.text));
 940                 break;
 941
 942         case exp_stringize:
 943                 if(pp_flex_debug)
 944                         fprintf(stderr, "add_expand_text: exp_stringize(%d): '%s'\n",
 945                                 mtp->subst.argidx,
 946                                 mep->args[mtp->subst.argidx]);
 947                 cptr = mep->args[mtp->subst.argidx];
 948                 add_text("\"", 1);
 949                 while(*cptr)
 950                 {
 951                         if(*cptr == '"' || *cptr == '\\')
 952                                 add_text("\\", 1);
 953                         add_text(cptr, 1);
 954                         cptr++;
 955                 }
 956                 add_text("\"", 1);
 957                 break;
 958
 959         case exp_concat:
 960                 if(pp_flex_debug)
 961                         fprintf(stderr, "add_expand_text: exp_concat\n");
 962                 /* Remove trailing whitespace from current expansion text */
 963                 while(curdef_idx)
 964                 {
 965                         if(isspace(curdef_text[curdef_idx-1] & 0xff))
 966                                 curdef_idx--;
 967                         else
 968                                 break;
 969                 }
 970                 /* tag current position and recursively expand the next part */
 971                 tag = curdef_idx;
 972                 mtp = add_expand_text(mtp->next, mep, nnl);
 973
 974                 /* Now get rid of the leading space of the expansion */
 975                 cptr = &curdef_text[tag];
 976                 n = curdef_idx - tag;
 977                 while(n)
 978                 {
 979                         if(isspace(*cptr & 0xff))
 980                         {
 981                                 cptr++;
 982                                 n--;
 983                         }
 984                         else
 985                                 break;
 986                 }
 987                 if(cptr != &curdef_text[tag])
 988                 {
 989                         memmove(&curdef_text[tag], cptr, n);
 990                         curdef_idx -= (curdef_idx - tag) - n;
 991                 }
 992                 break;
 993
 994         case exp_subst:
 995                 if((mtp->next && mtp->next->type == exp_concat) || (mtp->prev && mtp->prev->type == exp_concat))
 996                         exp = mep->args[mtp->subst.argidx];
 997                 else
 998                         exp = mep->ppargs[mtp->subst.argidx];
 999                 if(exp)
1000                 {
1001                         add_text(exp, strlen(exp));
1002                         *nnl -= mep->nnls[mtp->subst.argidx];
1003                         cptr = strchr(exp, '\n');
1004                         while(cptr)
1005                         {
1006                                 *cptr = ' ';
1007                                 cptr = strchr(cptr+1, '\n');
1008                         }
1009                         mep->nnls[mtp->subst.argidx] = 0;
1010                 }
1011                 if(pp_flex_debug)
1012                         fprintf(stderr, "add_expand_text: exp_subst(%d): '%s'\n", mtp->subst.argidx, exp);
1013                 break;
1014
1015         default:
1016                 pp_internal_error(__FILE__, __LINE__, "Invalid expansion type (%d) in macro expansion\n", mtp->type);
1017         }
1018         return mtp;
1019 }
1020
1021 static void expand_macro(macexpstackentry_t *mep)
1022 {
1023         mtext_t *mtp;
1024         int n, k;
1025         char *cptr;
1026         int nnl = 0;
1027         pp_entry_t *ppp = mep->ppp;
1028         int nargs = mep->nargs;
1029
1030         assert(ppp->type == def_macro);
1031         assert(ppp->expanding == 0);
1032
1033         if((ppp->nargs >= 0 && nargs != ppp->nargs) || (ppp->nargs < 0 && nargs < -ppp->nargs))
1034                 pperror("Too %s macro arguments (%d)", nargs < abs(ppp->nargs) ? "few" : "many", nargs);
1035
1036         for(n = 0; n < nargs; n++)
1037                 nnl += mep->nnls[n];
1038
1039         if(pp_flex_debug)
1040                 fprintf(stderr, "expand_macro(%d): %s:%d: '%s'(%d,%d) -> ...\n",
1041                         macexpstackidx,
1042                         pp_status.input,
1043                         pp_status.line_number,
1044                         ppp->ident,
1045                         mep->nargs,
1046                         nnl);
1047
1048         curdef_idx = 0;
1049
1050         for(mtp = ppp->subst.mtext; mtp; mtp = mtp->next)
1051         {
1052                 if(!(mtp = add_expand_text(mtp, mep, &nnl)))
1053                         break;
1054         }
1055
1056         for(n = 0; n < nnl; n++)
1057                 add_text("\n", 1);
1058
1059         /* To make sure there is room and termination (see below) */
1060         add_text(" \0", 2);
1061
1062         /* Strip trailing whitespace from expansion */
1063         for(k = curdef_idx, cptr = &curdef_text[curdef_idx-1]; k > 0; k--, cptr--)
1064         {
1065                 if(!isspace(*cptr & 0xff))
1066                         break;
1067         }
1068
1069         /*
1070          * We must add *one* whitespace to make sure that there
1071          * is a token-seperation after the expansion.
1072          */
1073         *(++cptr) = ' ';
1074         *(++cptr) = '\0';
1075         k++;
1076
1077         /* Strip leading whitespace from expansion */
1078         for(n = 0, cptr = curdef_text; n < k; n++, cptr++)
1079         {
1080                 if(!isspace(*cptr & 0xff))
1081                         break;
1082         }
1083
1084         if(k - n > 0)
1085         {
1086                 if(pp_flex_debug)
1087                         fprintf(stderr, "expand_text: '%s'\n", curdef_text + n);
1088                 push_buffer(ppp, NULL, NULL, 0);
1089                 /*yy_scan_bytes(curdef_text + n, k - n);*/
1090                 yy_scan_string(curdef_text + n);
1091         }
1092 }
1093
1094 /*
1095  *-------------------------------------------------------------------------
1096  * String collection routines
1097  *-------------------------------------------------------------------------
1098  */
1099 static void new_string(void)
1100 {
1101 #ifdef DEBUG
1102         if(strbuf_idx)
1103                 ppwarning("new_string: strbuf_idx != 0");
1104 #endif
1105         strbuf_idx = 0;
1106         str_startline = pp_status.line_number;
1107 }
1108
1109 static void add_string(char *str, int len)
1110 {
1111         if(len == 0)
1112                 return;
1113         if(strbuf_idx >= strbuf_alloc || strbuf_alloc - strbuf_idx < len)
1114         {
1115                 strbuf_alloc += (len + ALLOCBLOCKSIZE-1) & ~(ALLOCBLOCKSIZE-1);
1116                 strbuffer = pp_xrealloc(strbuffer, strbuf_alloc * sizeof(strbuffer[0]));
1117                 if(strbuf_alloc > 65536)
1118                         ppwarning("Reallocating string buffer larger than 64kB");
1119         }
1120         memcpy(&strbuffer[strbuf_idx], str, len);
1121         strbuf_idx += len;
1122 }
1123
1124 static char *get_string(void)
1125 {
1126         char *str = pp_xmalloc(strbuf_idx + 1);
1127         memcpy(str, strbuffer, strbuf_idx);
1128         str[strbuf_idx] = '\0';
1129 #ifdef DEBUG
1130         strbuf_idx = 0;
1131 #endif
1132         return str;
1133 }
1134
1135 static void put_string(void)
1136 {
1137         put_buffer(strbuffer, strbuf_idx);
1138 #ifdef DEBUG
1139         strbuf_idx = 0;
1140 #endif
1141 }
1142
1143 static int string_start(void)
1144 {
1145         return str_startline;
1146 }
1147
1148
1149 /*
1150  *-------------------------------------------------------------------------
1151  * Buffer management
1152  *-------------------------------------------------------------------------
1153  */
1154 static void push_buffer(pp_entry_t *ppp, char *filename, char *incname, int pop)
1155 {
1156         if(ppdebug)
1157                 printf("push_buffer(%d): %p %p %p %d\n", bufferstackidx, ppp, filename, incname, pop);
1158         if(bufferstackidx >= MAXBUFFERSTACK)
1159                 pp_internal_error(__FILE__, __LINE__, "Buffer stack overflow");
1160
1161         memset(&bufferstack[bufferstackidx], 0, sizeof(bufferstack[0]));
1162         bufferstack[bufferstackidx].bufferstate = YY_CURRENT_BUFFER;
1163         bufferstack[bufferstackidx].define      = ppp;
1164         bufferstack[bufferstackidx].line_number = pp_status.line_number;
1165         bufferstack[bufferstackidx].char_number = pp_status.char_number;
1166         bufferstack[bufferstackidx].if_depth    = pp_get_if_depth();
1167         bufferstack[bufferstackidx].should_pop  = pop;
1168         bufferstack[bufferstackidx].filename    = pp_status.input;
1169         bufferstack[bufferstackidx].ncontinuations      = ncontinuations;
1170         bufferstack[bufferstackidx].incl                = pp_incl_state;
1171         bufferstack[bufferstackidx].include_filename    = incname;
1172         bufferstack[bufferstackidx].pass_data           = pass_data;
1173
1174         if(ppp)
1175                 ppp->expanding = 1;
1176         else if(filename)
1177         {
1178                 /* These will track the pperror to the correct file and line */
1179                 pp_status.line_number = 1;
1180                 pp_status.char_number = 1;
1181                 pp_status.input  = filename;
1182                 ncontinuations = 0;
1183         }
1184         else if(!pop)
1185                 pp_internal_error(__FILE__, __LINE__, "Pushing buffer without knowing where to go to");
1186         bufferstackidx++;
1187 }
1188
1189 static bufferstackentry_t *pop_buffer(void)
1190 {
1191         if(bufferstackidx < 0)
1192                 pp_internal_error(__FILE__, __LINE__, "Bufferstack underflow?");
1193
1194         if(bufferstackidx == 0)
1195                 return NULL;
1196
1197         bufferstackidx--;
1198
1199         if(bufferstack[bufferstackidx].define)
1200                 bufferstack[bufferstackidx].define->expanding = 0;
1201         else
1202         {
1203                 pp_status.line_number = bufferstack[bufferstackidx].line_number;
1204                 pp_status.char_number = bufferstack[bufferstackidx].char_number;
1205                 pp_status.input  = bufferstack[bufferstackidx].filename;
1206                 ncontinuations = bufferstack[bufferstackidx].ncontinuations;
1207                 if(!bufferstack[bufferstackidx].should_pop)
1208                 {
1209                         fclose(ppin);
1210                         fprintf(ppout, "# %d \"%s\" 2\n", pp_status.line_number, pp_status.input);
1211
1212                         /* We have EOF, check the include logic */
1213                         if(pp_incl_state.state == 2 && !pp_incl_state.seen_junk && pp_incl_state.ppp)
1214                         {
1215                                 pp_entry_t *ppp = pplookup(pp_incl_state.ppp);
1216                                 if(ppp)
1217                                 {
1218                                         includelogicentry_t *iep = pp_xmalloc(sizeof(includelogicentry_t));
1219                                         iep->ppp = ppp;
1220                                         ppp->iep = iep;
1221                                         iep->filename = bufferstack[bufferstackidx].include_filename;
1222                                         iep->prev = NULL;
1223                                         iep->next = pp_includelogiclist;
1224                                         if(iep->next)
1225                                                 iep->next->prev = iep;
1226                                         pp_includelogiclist = iep;
1227                                         if(pp_status.debug)
1228                                                 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);
1229                                 }
1230                                 else if(bufferstack[bufferstackidx].include_filename)
1231                                         free(bufferstack[bufferstackidx].include_filename);
1232                         }
1233                         if(pp_incl_state.ppp)
1234                                 free(pp_incl_state.ppp);
1235                         pp_incl_state   = bufferstack[bufferstackidx].incl;
1236                         pass_data       = bufferstack[bufferstackidx].pass_data;
1237
1238                 }
1239         }
1240
1241         if(ppdebug)
1242                 printf("pop_buffer(%d): %p %p (%d, %d, %d) %p %d\n",
1243                         bufferstackidx,
1244                         bufferstack[bufferstackidx].bufferstate,
1245                         bufferstack[bufferstackidx].define,
1246                         bufferstack[bufferstackidx].line_number,
1247                         bufferstack[bufferstackidx].char_number,
1248                         bufferstack[bufferstackidx].if_depth,
1249                         bufferstack[bufferstackidx].filename,
1250                         bufferstack[bufferstackidx].should_pop);
1251
1252         pp_switch_to_buffer(bufferstack[bufferstackidx].bufferstate);
1253
1254         if(bufferstack[bufferstackidx].should_pop)
1255         {
1256                 if(yy_current_state() == pp_macexp)
1257                         macro_add_expansion();
1258                 else
1259                         pp_internal_error(__FILE__, __LINE__, "Pop buffer and state without macro expansion state");
1260                 yy_pop_state();
1261         }
1262
1263         return &bufferstack[bufferstackidx];
1264 }
1265
1266
1267 /*
1268  *-------------------------------------------------------------------------
1269  * Macro nestng support
1270  *-------------------------------------------------------------------------
1271  */
1272 static void push_macro(pp_entry_t *ppp)
1273 {
1274         if(macexpstackidx >= MAXMACEXPSTACK)
1275                 pperror("Too many nested macros");
1276
1277         macexpstack[macexpstackidx] = pp_xmalloc(sizeof(macexpstack[0][0]));
1278         memset( macexpstack[macexpstackidx], 0, sizeof(macexpstack[0][0]));
1279         macexpstack[macexpstackidx]->ppp = ppp;
1280         macexpstackidx++;
1281 }
1282
1283 static macexpstackentry_t *top_macro(void)
1284 {
1285         return macexpstackidx > 0 ? macexpstack[macexpstackidx-1] : NULL;
1286 }
1287
1288 static macexpstackentry_t *pop_macro(void)
1289 {
1290         if(macexpstackidx <= 0)
1291                 pp_internal_error(__FILE__, __LINE__, "Macro expansion stack underflow\n");
1292         return macexpstack[--macexpstackidx];
1293 }
1294
1295 static void free_macro(macexpstackentry_t *mep)
1296 {
1297         int i;
1298
1299         for(i = 0; i < mep->nargs; i++)
1300                 free(mep->args[i]);
1301         if(mep->args)
1302                 free(mep->args);
1303         if(mep->nnls)
1304                 free(mep->nnls);
1305         if(mep->curarg)
1306                 free(mep->curarg);
1307         free(mep);
1308 }
1309
1310 static void add_text_to_macro(char *text, int len)
1311 {
1312         macexpstackentry_t *mep = top_macro();
1313
1314         assert(mep->ppp->expanding == 0);
1315
1316         if(mep->curargalloc - mep->curargsize <= len+1) /* +1 for '\0' */
1317         {
1318                 mep->curargalloc += (ALLOCBLOCKSIZE > len+1) ? ALLOCBLOCKSIZE : len+1;
1319                 mep->curarg = pp_xrealloc(mep->curarg, mep->curargalloc * sizeof(mep->curarg[0]));
1320         }
1321         memcpy(mep->curarg + mep->curargsize, text, len);
1322         mep->curargsize += len;
1323         mep->curarg[mep->curargsize] = '\0';
1324 }
1325
1326 static void macro_add_arg(int last)
1327 {
1328         int nnl = 0;
1329         char *cptr;
1330         macexpstackentry_t *mep = top_macro();
1331
1332         assert(mep->ppp->expanding == 0);
1333
1334         mep->args = pp_xrealloc(mep->args, (mep->nargs+1) * sizeof(mep->args[0]));
1335         mep->ppargs = pp_xrealloc(mep->ppargs, (mep->nargs+1) * sizeof(mep->ppargs[0]));
1336         mep->nnls = pp_xrealloc(mep->nnls, (mep->nargs+1) * sizeof(mep->nnls[0]));
1337         mep->args[mep->nargs] = pp_xstrdup(mep->curarg ? mep->curarg : "");
1338         cptr = mep->args[mep->nargs]-1;
1339         while((cptr = strchr(cptr+1, '\n')))
1340         {
1341                 nnl++;
1342         }
1343         mep->nnls[mep->nargs] = nnl;
1344         mep->nargs++;
1345         free(mep->curarg);
1346         mep->curargalloc = mep->curargsize = 0;
1347         mep->curarg = NULL;
1348
1349         if(pp_flex_debug)
1350                 fprintf(stderr, "macro_add_arg: %s:%d: %d -> '%s'\n",
1351                         pp_status.input,
1352                         pp_status.line_number,
1353                         mep->nargs-1,
1354                         mep->args[mep->nargs-1]);
1355
1356         /* Each macro argument must be expanded to cope with stingize */
1357         if(last || mep->args[mep->nargs-1][0])
1358         {
1359                 yy_push_state(pp_macexp);
1360                 push_buffer(NULL, NULL, NULL, last ? 2 : 1);
1361                 yy_scan_string(mep->args[mep->nargs-1]);
1362                 /*mep->bufferstackidx = bufferstackidx;  But not nested! */
1363         }
1364 }
1365
1366 static void macro_add_expansion(void)
1367 {
1368         macexpstackentry_t *mep = top_macro();
1369
1370         assert(mep->ppp->expanding == 0);
1371
1372         mep->ppargs[mep->nargs-1] = pp_xstrdup(mep->curarg ? mep->curarg : "");
1373         free(mep->curarg);
1374         mep->curargalloc = mep->curargsize = 0;
1375         mep->curarg = NULL;
1376
1377         if(pp_flex_debug)
1378                 fprintf(stderr, "macro_add_expansion: %s:%d: %d -> '%s'\n",
1379                         pp_status.input,
1380                         pp_status.line_number,
1381                         mep->nargs-1,
1382                         mep->ppargs[mep->nargs-1]);
1383 }
1384
1385
1386 /*
1387  *-------------------------------------------------------------------------
1388  * Output management
1389  *-------------------------------------------------------------------------
1390  */
1391 static void put_buffer(char *s, int len)
1392 {
1393         if(top_macro())
1394                 add_text_to_macro(s, len);
1395         else {
1396            if(pass_data)
1397            fwrite(s, 1, len, ppout);
1398         }
1399 }
1400
1401
1402 /*
1403  *-------------------------------------------------------------------------
1404  * Include management
1405  *-------------------------------------------------------------------------
1406  */
1407 static int is_c_h_include(char *fname)
1408 {
1409         int sl=strlen(fname);
1410         if (sl < 2) return 0;
1411         if ((toupper(fname[sl-1])!='H') && (toupper(fname[sl-1])!='C')) return 0;
1412         if (fname[sl-2]!='.') return 0;
1413         return 1;
1414 }
1415
1416 void pp_do_include(char *fname, int type)
1417 {
1418         char *newpath;
1419         int n;
1420         includelogicentry_t *iep;
1421
1422         for(iep = pp_includelogiclist; iep; iep = iep->next)
1423         {
1424                 if(!strcmp(iep->filename, fname))
1425                 {
1426                         /*
1427                          * We are done. The file was included before.
1428                          * If the define was deleted, then this entry would have
1429                          * been deleted too.
1430                          */
1431                         return;
1432                 }
1433         }
1434
1435         n = strlen(fname);
1436
1437         if(n <= 2)
1438                 pperror("Empty include filename");
1439
1440         /* Undo the effect of the quotation */
1441         fname[n-1] = '\0';
1442
1443         if((ppin = pp_open_include(fname+1, type, &newpath)) == NULL)
1444                 pperror("Unable to open include file %s", fname+1);
1445
1446         fname[n-1] = *fname;    /* Redo the quotes */
1447         push_buffer(NULL, newpath, fname, 0);
1448         pp_incl_state.seen_junk = 0;
1449         pp_incl_state.state = 0;
1450         pp_incl_state.ppp = NULL;
1451         if (is_c_h_include(newpath)) pass_data=0;
1452         else pass_data=1;
1453
1454         if(pp_status.debug)
1455                 fprintf(stderr, "pp_do_include: %s:%d: include_state=%d, include_ppp='%s', include_ifdepth=%d ,pass_data=%d\n",
1456                         pp_status.input, pp_status.line_number, pp_incl_state.state, pp_incl_state.ppp, pp_incl_state.ifdepth, pass_data);
1457         pp_switch_to_buffer(pp_create_buffer(ppin, YY_BUF_SIZE));
1458
1459         fprintf(ppout, "# 1 \"%s\" 1%s\n", newpath, type ? "" : " 3");
1460 }
1461
1462 /*
1463  *-------------------------------------------------------------------------
1464  * Push/pop preprocessor ignore state when processing conditionals
1465  * which are false.
1466  *-------------------------------------------------------------------------
1467  */
1468 void pp_push_ignore_state(void)
1469 {
1470         yy_push_state(pp_ignore);
1471 }
1472
1473 void pp_pop_ignore_state(void)
1474 {
1475         yy_pop_state();
1476 }