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   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  */
 123
 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"
 131
 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
 153
 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]
 157
 158 %{
 159 #include <stdio.h>
 160 #include <stdlib.h>
 161 #include <string.h>
 162 #include <ctype.h>
 163 #include <assert.h>
 164
 165 #include "wpp_private.h"
 166 #include "ppy.tab.h"
 167
 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
 174
 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, 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);
 257
 258 /*
 259  * Local variables
 260  */
 261 static int ncontinuations;
 262
 263 static int strbuf_idx = 0;
 264 static int strbuf_alloc = 0;
 265 static char *strbuffer = NULL;
 266 static int str_startline;
 267
 268 static macexpstackentry_t *macexpstack[MAXMACEXPSTACK];
 269 static int macexpstackidx = 0;
 270
 271 static bufferstackentry_t bufferstack[MAXBUFFERSTACK];
 272 static int bufferstackidx = 0;
 273
 274 static int pass_data=1;
 275
 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 };
 286
 287 includelogicentry_t *pp_includelogiclist = NULL;
 288
 289 %}
 290
 291 /*
 292  **************************************************************************
 293  * The scanner starts here
 294  **************************************************************************
 295  */
 296
 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          */
 306
 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);
 311
 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;
 335
 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");
 346
 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?)|(.)          ;
 354
 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          */
 361
 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;
 383
 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");
 393
 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.");
 401
 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");
 412
 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);
 424
 425         /*
 426          * Handle left side of #define
 427          */
 428 <pp_def>{cident}\(              pplval.cptr = pp_xstrdup(pptext); pplval.cptr[ppleng-1] = '\0'; yy_pp_state(pp_macro);  return tMACRO;
 429 <pp_def>{cident}                pplval.cptr = pp_xstrdup(pptext); yy_pp_state(pp_define); return tDEFINE;
 430 <pp_def>{ws}+                   ;
 431 <pp_def>\\\r?\n                 newline(0);
 432 <pp_def>(\\\r?)|(\n)|(.)        perror("Identifier expected");
 433
 434         /*
 435          * Scan the substitution of a define
 436          */
 437 <pp_define>[^'"/\\\n]+          pplval.cptr = pp_xstrdup(pptext); return tLITERAL;
 438 <pp_define>(\\\r?)|(\/[^/*])    pplval.cptr = pp_xstrdup(pptext); return tLITERAL;
 439 <pp_define>\\\r?\n{ws}+         newline(0); pplval.cptr = pp_xstrdup(" "); return tLITERAL;
 440 <pp_define>\\\r?\n              newline(0);
 441 <pp_define>\n                   newline(1); yy_pop_state(); return tNL;
 442 <pp_define>\'                   new_string(); add_string(pptext, ppleng); yy_push_state(pp_sqs);
 443 <pp_define>\"                   new_string(); add_string(pptext, ppleng); yy_push_state(pp_dqs);
 444
 445         /*
 446          * Scan the definition macro arguments
 447          */
 448 <pp_macro>\){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);
 455
 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);
 470
 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         }
 493
 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);
 523
 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();
 531
 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         }
 539
 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         }
 620
 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");
 631
 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         }
 664
 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);
 674
 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);
 680
 681 <RCINCL>[A-Za-z0-9_\.\\/]+ {
 682                 pplval.cptr=pp_xstrdup(pptext);
 683                 yy_pop_state();
 684                 return tRCINCLUDEPATH;
 685         }
 686
 687 <RCINCL>{ws}+ ;
 688
 689 <RCINCL>\"              {
 690                 new_string(); add_string(pptext,ppleng);yy_push_state(pp_dqs);
 691         }
 692
 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);
 698
 699 <<EOF>> {
 700                 YY_BUFFER_STATE b = YY_CURRENT_BUFFER;
 701                 bufferstackentry_t *bep = pop_buffer();
 702
 703                 if((!bep && pp_get_if_depth()) || (bep && pp_get_if_depth() != bep->if_depth))
 704                         ppwarning("Unmatched #if/#endif at end of file");
 705
 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         }
 720
 721 %%
 722 /*
 723  **************************************************************************
 724  * Support functions
 725  **************************************************************************
 726  */
 727
 728 #ifndef ppwrap
 729 int ppwrap(void)
 730 {
 731         return 1;
 732 }
 733 #endif
 734
 735
 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;
 749
 750         if(dowrite == -1)
 751                 return;
 752
 753         ncontinuations++;
 754         if(dowrite)
 755         {
 756                 for(;ncontinuations; ncontinuations--)
 757                         put_buffer("\n", 1);
 758         }
 759 }
 760
 761
 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];
 792
 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]) : ' ';
 797
 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         }
 822
 823         if(is_ll)
 824                 pp_internal_error(__FILE__, __LINE__, "long long constants not implemented yet");
 825
 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         }
 841
 842         /* Else it must be an int... */
 843         val->sint = (int)strtol(str, NULL, radix);
 844         return tSINT;
 845 }
 846
 847
 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;
 859
 860         assert(ppp->type == def_special);
 861
 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);
 876
 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 : "");
 884
 885         if(buf && buf[0])
 886         {
 887                 push_buffer(ppp, NULL, NULL, 0);
 888                 yy_scan_string(buf);
 889         }
 890 }
 891
 892 static void expand_define(pp_entry_t *ppp)
 893 {
 894         assert(ppp->type == def_define);
 895
 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 }
 909
 910 static int curdef_idx = 0;
 911 static int curdef_alloc = 0;
 912 static char *curdef_text = NULL;
 913
 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 }
 928
 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;
 935
 936         if(mtp == NULL)
 937                 return NULL;
 938
 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;
 946
 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;
 963
 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);
 978
 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;
 998
 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;
1019
1020         default:
1021                 pp_internal_error(__FILE__, __LINE__, "Invalid expansion type (%d) in macro expansion\n", mtp->type);
1022         }
1023         return mtp;
1024 }
1025
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;
1034
1035         assert(ppp->type == def_macro);
1036         assert(ppp->expanding == 0);
1037
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);
1040
1041         for(n = 0; n < nargs; n++)
1042                 nnl += mep->nnls[n];
1043
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);
1052
1053         curdef_idx = 0;
1054
1055         for(mtp = ppp->subst.mtext; mtp; mtp = mtp->next)
1056         {
1057                 if(!(mtp = add_expand_text(mtp, mep, &nnl)))
1058                         break;
1059         }
1060
1061         for(n = 0; n < nnl; n++)
1062                 add_text("\n", 1);
1063
1064         /* To make sure there is room and termination (see below) */
1065         add_text(" \0", 2);
1066
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         }
1073
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++;
1081
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         }
1088
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 }
1098
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 }
1113
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 }
1128
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 }
1139
1140 static void put_string(void)
1141 {
1142         put_buffer(strbuffer, strbuf_idx);
1143 #ifdef DEBUG
1144         strbuf_idx = 0;
1145 #endif
1146 }
1147
1148 static int string_start(void)
1149 {
1150         return str_startline;
1151 }
1152
1153
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");
1165
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;
1178
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 }
1193
1194 static bufferstackentry_t *pop_buffer(void)
1195 {
1196         if(bufferstackidx < 0)
1197                 pp_internal_error(__FILE__, __LINE__, "Bufferstack underflow?");
1198
1199         if(bufferstackidx == 0)
1200                 return NULL;
1201
1202         bufferstackidx--;
1203
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);
1216
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;
1242
1243                 }
1244         }
1245
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);
1256
1257         pp_switch_to_buffer(bufferstack[bufferstackidx].bufferstate);
1258
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         }
1267
1268         return &bufferstack[bufferstackidx];
1269 }
1270
1271
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");
1281
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 }
1287
1288 static macexpstackentry_t *top_macro(void)
1289 {
1290         return macexpstackidx > 0 ? macexpstack[macexpstackidx-1] : NULL;
1291 }
1292
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 }
1299
1300 static void free_macro(macexpstackentry_t *mep)
1301 {
1302         int i;
1303
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 }
1314
1315 static void add_text_to_macro(const char *text, int len)
1316 {
1317         macexpstackentry_t *mep = top_macro();
1318
1319         assert(mep->ppp->expanding == 0);
1320
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 }
1330
1331 static void macro_add_arg(int last)
1332 {
1333         int nnl = 0;
1334         char *cptr;
1335         macexpstackentry_t *mep = top_macro();
1336
1337         assert(mep->ppp->expanding == 0);
1338
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;
1353
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]);
1360
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 }
1370
1371 static void macro_add_expansion(void)
1372 {
1373         macexpstackentry_t *mep = top_macro();
1374
1375         assert(mep->ppp->expanding == 0);
1376
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;
1381
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 }
1389
1390
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 }
1405
1406
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 }
1420
1421 void pp_do_include(char *fname, int type)
1422 {
1423         char *newpath;
1424         int n;
1425         includelogicentry_t *iep;
1426
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         }
1439
1440         n = strlen(fname);
1441
1442         if(n <= 2)
1443                 pperror("Empty include filename");
1444
1445         /* Undo the effect of the quotation */
1446         fname[n-1] = '\0';
1447
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);
1450
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;
1458
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));
1463
1464         fprintf(ppout, "# 1 \"%s\" 1%s\n", newpath, type ? "" : " 3");
1465 }
1466
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 }
1477
1478 void pp_pop_ignore_state(void)
1479 {
1480         yy_pop_state();
1481 }