tools/widl/parser.l

   1 /* -*-C-*-
   2  * IDL Compiler
   3  *
   4  * Copyright 2002 Ove Kaaven
   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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 %option stack
  22 %option noinput nounput noyy_top_state
  23 %option 8bit never-interactive prefix="parser_"
  24
  25 nl      \r?\n
  26 ws      [ \f\t\r]
  27 cident  [a-zA-Z_][0-9a-zA-Z_]*
  28 u_suffix        (u|U)
  29 l_suffix        (l|L)
  30 int     [0-9]+({l_suffix}?{u_suffix}?|{u_suffix}?{l_suffix}?)?
  31 hexd    [0-9a-fA-F]
  32 hex     0(x|X){hexd}+({l_suffix}?{u_suffix}?|{u_suffix}?{l_suffix}?)?
  33 uuid    {hexd}{8}-{hexd}{4}-{hexd}{4}-{hexd}{4}-{hexd}{12}
  34 double  [0-9]+\.[0-9]+([eE][+-]?[0-9]+)*
  35
  36 %x QUOTE
  37 %x WSTRQUOTE
  38 %x ATTR
  39 %x PP_LINE
  40 %x PP_PRAGMA
  41 %x SQUOTE
  42
  43 %{
  44
  45 #include "config.h"
  46
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <ctype.h>
  51 #include <assert.h>
  52 #include <errno.h>
  53 #include <limits.h>
  54 #define YY_NO_UNISTD_H
  55
  56 #include "widl.h"
  57 #include "utils.h"
  58 #include "parser.h"
  59 #include "wpp_private.h"
  60
  61 #include "parser.tab.h"
  62
  63 static void addcchar(char c);
  64 static char *get_buffered_cstring(void);
  65
  66 static char *cbuffer;
  67 static int cbufidx;
  68 static int cbufalloc = 0;
  69
  70 static int kw_token(const char *kw);
  71 static int attr_token(const char *kw);
  72
  73 static void switch_to_acf(void);
  74
  75 static warning_list_t *disabled_warnings = NULL;
  76
  77 #define MAX_IMPORT_DEPTH 20
  78 struct {
  79   YY_BUFFER_STATE state;
  80   char *input_name;
  81   int   line_number;
  82   char *temp_name;
  83 } import_stack[MAX_IMPORT_DEPTH];
  84 int import_stack_ptr = 0;
  85
  86 /* converts an integer in string form to an unsigned long and prints an error
  87  * on overflow */
  88 static unsigned int xstrtoul(const char *nptr, char **endptr, int base)
  89 {
  90     unsigned long val;
  91
  92     errno = 0;
  93     val = strtoul(nptr, endptr, base);
  94     if ((val == ULONG_MAX && errno == ERANGE) || ((unsigned int)val != val))
  95         error_loc("integer constant %s is too large\n", nptr);
  96     return val;
  97 }
  98
  99 struct uuid *parse_uuid(const char *u)
 100 {
 101   struct uuid* uuid = xmalloc(sizeof(*uuid));
 102   char b[3];
 103   /* it would be nice to use UuidFromStringA */
 104   uuid->Data1 = strtoul(u, NULL, 16);
 105   uuid->Data2 = strtoul(u+9, NULL, 16);
 106   uuid->Data3 = strtoul(u+14, NULL, 16);
 107   b[2] = 0;
 108   memcpy(b, u+19, 2); uuid->Data4[0] = strtoul(b, NULL, 16);
 109   memcpy(b, u+21, 2); uuid->Data4[1] = strtoul(b, NULL, 16);
 110   memcpy(b, u+24, 2); uuid->Data4[2] = strtoul(b, NULL, 16);
 111   memcpy(b, u+26, 2); uuid->Data4[3] = strtoul(b, NULL, 16);
 112   memcpy(b, u+28, 2); uuid->Data4[4] = strtoul(b, NULL, 16);
 113   memcpy(b, u+30, 2); uuid->Data4[5] = strtoul(b, NULL, 16);
 114   memcpy(b, u+32, 2); uuid->Data4[6] = strtoul(b, NULL, 16);
 115   memcpy(b, u+34, 2); uuid->Data4[7] = strtoul(b, NULL, 16);
 116   return uuid;
 117 }
 118
 119 %}
 120
 121 /*
 122  **************************************************************************
 123  * The flexer starts here
 124  **************************************************************************
 125  */
 126 %%
 127 <INITIAL>^{ws}*\#{ws}*pragma{ws}+ yy_push_state(PP_PRAGMA);
 128 <INITIAL,ATTR>^{ws}*\#{ws}*     yy_push_state(PP_LINE);
 129 <PP_LINE>[^\n]*         {
 130                             int lineno;
 131                             char *cptr, *fname;
 132                             yy_pop_state();
 133                             lineno = (int)strtol(yytext, &cptr, 10);
 134                             if(!lineno)
 135                                 error_loc("Malformed '#...' line-directive; invalid linenumber\n");
 136                             fname = strchr(cptr, '"');
 137                             if(!fname)
 138                                 error_loc("Malformed '#...' line-directive; missing filename\n");
 139                             fname++;
 140                             cptr = strchr(fname, '"');
 141                             if(!cptr)
 142                                 error_loc("Malformed '#...' line-directive; missing terminating \"\n");
 143                             *cptr = '\0';
 144                             line_number = lineno - 1;  /* We didn't read the newline */
 145                             input_name = xstrdup(fname);
 146                         }
 147 <PP_PRAGMA>midl_echo[^\n]*  yyless(9); yy_pop_state(); return tCPPQUOTE;
 148 <PP_PRAGMA>winrt[^\n]*  {
 149                             if(import_stack_ptr) {
 150                                 if(!winrt_mode)
 151                                     error_loc("winrt IDL file imported in non-winrt mode\n");
 152                             }else {
 153                                 const char *ptr = yytext+5;
 154
 155                                 winrt_mode = TRUE;
 156
 157                                 while(isspace(*ptr))
 158                                     ptr++;
 159                                 if(!strncmp(ptr, "ns_prefix", 9) && (!*(ptr += 9) || isspace(*ptr)))
 160                                     use_abi_namespace = TRUE;
 161                             }
 162                             yy_pop_state();
 163                         }
 164 <PP_PRAGMA>[^\n]*       parser_lval.str = xstrdup(yytext); yy_pop_state(); return aPRAGMA;
 165 <INITIAL>^{ws}*midl_pragma{ws}+warning return tPRAGMA_WARNING;
 166 <INITIAL,ATTR>\"        yy_push_state(QUOTE); cbufidx = 0;
 167 <QUOTE>\"               {
 168                                 yy_pop_state();
 169                                 parser_lval.str = get_buffered_cstring();
 170                                 return aSTRING;
 171                         }
 172 <INITIAL,ATTR>L\"       yy_push_state(WSTRQUOTE); cbufidx = 0;
 173 <WSTRQUOTE>\"           {
 174                                 yy_pop_state();
 175                                 parser_lval.str = get_buffered_cstring();
 176                                 return aWSTRING;
 177                         }
 178 <INITIAL,ATTR>\'        yy_push_state(SQUOTE); cbufidx = 0;
 179 <SQUOTE>\'              {
 180                                 yy_pop_state();
 181                                 parser_lval.str = get_buffered_cstring();
 182                                 return aSQSTRING;
 183                         }
 184 <QUOTE,WSTRQUOTE,SQUOTE>\\\\    |
 185 <QUOTE,WSTRQUOTE>\\\"   addcchar(yytext[1]);
 186 <SQUOTE>\\\'    addcchar(yytext[1]);
 187 <QUOTE,WSTRQUOTE,SQUOTE>\\.     addcchar('\\'); addcchar(yytext[1]);
 188 <QUOTE,WSTRQUOTE,SQUOTE>.       addcchar(yytext[0]);
 189 <INITIAL,ATTR>\[        yy_push_state(ATTR); return '[';
 190 <ATTR>\]                yy_pop_state(); return ']';
 191 <ATTR>{cident}          return attr_token(yytext);
 192 <ATTR>{uuid}                    {
 193                                 parser_lval.uuid = parse_uuid(yytext);
 194                                 return aUUID;
 195                         }
 196 <INITIAL,ATTR>{hex}     {
 197                                 parser_lval.num = xstrtoul(yytext, NULL, 0);
 198                                 return aHEXNUM;
 199                         }
 200 <INITIAL,ATTR>{int}     {
 201                                 parser_lval.num = xstrtoul(yytext, NULL, 0);
 202                                 return aNUM;
 203                         }
 204 <INITIAL>{double}       {
 205                                 parser_lval.dbl = strtod(yytext, NULL);
 206                                 return aDOUBLE;
 207                         }
 208 SAFEARRAY{ws}*/\(       return tSAFEARRAY;
 209 {cident}                return kw_token(yytext);
 210 <INITIAL,ATTR>\n        line_number++;
 211 <INITIAL,ATTR>{ws}
 212 <INITIAL,ATTR>\<\<      return SHL;
 213 <INITIAL,ATTR>\>\>      return SHR;
 214 <INITIAL,ATTR>\-\>      return MEMBERPTR;
 215 <INITIAL,ATTR>==        return EQUALITY;
 216 <INITIAL,ATTR>!=        return INEQUALITY;
 217 <INITIAL,ATTR>\>=       return GREATEREQUAL;
 218 <INITIAL,ATTR>\<=       return LESSEQUAL;
 219 <INITIAL,ATTR>\|\|      return LOGICALOR;
 220 <INITIAL,ATTR>&&        return LOGICALAND;
 221 <INITIAL,ATTR>\.\.\.    return ELLIPSIS;
 222 <INITIAL,ATTR>.         return yytext[0];
 223 <<EOF>>                 {
 224                             if (import_stack_ptr)
 225                                 return aEOF;
 226                             if (acf_name)
 227                             {
 228                                 switch_to_acf();
 229                                 return aACF;
 230                             }
 231                             yyterminate();
 232                         }
 233 %%
 234
 235 #ifndef parser_wrap
 236 int parser_wrap(void)
 237 {
 238         return 1;
 239 }
 240 #endif
 241
 242 struct keyword {
 243         const char *kw;
 244         int token;
 245         int winrt_only : 1;
 246 };
 247
 248 /* This table MUST be alphabetically sorted on the kw field */
 249 static const struct keyword keywords[] = {
 250         {"FALSE",           tFALSE,          0},
 251         {"NULL",            tNULL,           0},
 252         {"TRUE",            tTRUE,           0},
 253         {"__cdecl",         tCDECL,          0},
 254         {"__fastcall",      tFASTCALL,       0},
 255         {"__int32",         tINT32,          0},
 256         {"__int3264",       tINT3264,        0},
 257         {"__int64",         tINT64,          0},
 258         {"__pascal",        tPASCAL,         0},
 259         {"__stdcall",       tSTDCALL,        0},
 260         {"_cdecl",          tCDECL,          0},
 261         {"_fastcall",       tFASTCALL,       0},
 262         {"_pascal",         tPASCAL,         0},
 263         {"_stdcall",        tSTDCALL,        0},
 264         {"apicontract",     tAPICONTRACT,    1},
 265         {"boolean",         tBOOLEAN,        0},
 266         {"byte",            tBYTE,           0},
 267         {"case",            tCASE,           0},
 268         {"cdecl",           tCDECL,          0},
 269         {"char",            tCHAR,           0},
 270         {"coclass",         tCOCLASS,        0},
 271         {"const",           tCONST,          0},
 272         {"cpp_quote",       tCPPQUOTE,       0},
 273         {"declare",         tDECLARE,        1},
 274         {"default",         tDEFAULT,        0},
 275         {"delegate",        tDELEGATE,       1},
 276         {"dispinterface",   tDISPINTERFACE,  0},
 277         {"double",          tDOUBLE,         0},
 278         {"enum",            tENUM,           0},
 279         {"error_status_t",  tERRORSTATUST,   0},
 280         {"extern",          tEXTERN,         0},
 281         {"float",           tFLOAT,          0},
 282         {"handle_t",        tHANDLET,        0},
 283         {"hyper",           tHYPER,          0},
 284         {"import",          tIMPORT,         0},
 285         {"importlib",       tIMPORTLIB,      0},
 286         {"inline",          tINLINE,         0},
 287         {"int",             tINT,            0},
 288         {"interface",       tINTERFACE,      0},
 289         {"library",         tLIBRARY,        0},
 290         {"long",            tLONG,           0},
 291         {"methods",         tMETHODS,        0},
 292         {"module",          tMODULE,         0},
 293         {"namespace",       tNAMESPACE,      1},
 294         {"pascal",          tPASCAL,         0},
 295         {"properties",      tPROPERTIES,     0},
 296         {"register",        tREGISTER,       0},
 297         {"requires",        tREQUIRES,       1},
 298         {"runtimeclass",    tRUNTIMECLASS,   1},
 299         {"short",           tSHORT,          0},
 300         {"signed",          tSIGNED,         0},
 301         {"sizeof",          tSIZEOF,         0},
 302         {"small",           tSMALL,          0},
 303         {"static",          tSTATIC,         0},
 304         {"stdcall",         tSTDCALL,        0},
 305         {"struct",          tSTRUCT,         0},
 306         {"switch",          tSWITCH,         0},
 307         {"typedef",         tTYPEDEF,        0},
 308         {"union",           tUNION,          0},
 309         {"unsigned",        tUNSIGNED,       0},
 310         {"void",            tVOID,           0},
 311         {"wchar_t",         tWCHAR,          0},
 312 };
 313 #define NKEYWORDS (sizeof(keywords)/sizeof(keywords[0]))
 314
 315 /* keywords only recognized in attribute lists
 316  * This table MUST be alphabetically sorted on the kw field
 317  */
 318 static const struct keyword attr_keywords[] =
 319 {
 320         {"activatable",                 tACTIVATABLE,               1},
 321         {"aggregatable",                tAGGREGATABLE,              0},
 322         {"agile",                       tAGILE,                     1},
 323         {"all_nodes",                   tALLNODES,                  0},
 324         {"allocate",                    tALLOCATE,                  0},
 325         {"annotation",                  tANNOTATION,                0},
 326         {"apartment",                   tAPARTMENT,                 0},
 327         {"appobject",                   tAPPOBJECT,                 0},
 328         {"async",                       tASYNC,                     0},
 329         {"async_uuid",                  tASYNCUUID,                 0},
 330         {"auto_handle",                 tAUTOHANDLE,                0},
 331         {"bindable",                    tBINDABLE,                  0},
 332         {"both",                        tBOTH,                      0},
 333         {"broadcast",                   tBROADCAST,                 0},
 334         {"byte_count",                  tBYTECOUNT,                 0},
 335         {"call_as",                     tCALLAS,                    0},
 336         {"callback",                    tCALLBACK,                  0},
 337         {"code",                        tCODE,                      0},
 338         {"comm_status",                 tCOMMSTATUS,                0},
 339         {"context_handle",              tCONTEXTHANDLE,             0},
 340         {"context_handle_noserialize",  tCONTEXTHANDLENOSERIALIZE,  0},
 341         {"context_handle_serialize",    tCONTEXTHANDLENOSERIALIZE,  0},
 342         {"contract",                    tCONTRACT,                  1},
 343         {"contractversion",             tCONTRACTVERSION,           1},
 344         {"control",                     tCONTROL,                   0},
 345         {"custom",                      tCUSTOM,                    0},
 346         {"decode",                      tDECODE,                    0},
 347         {"defaultbind",                 tDEFAULTBIND,               0},
 348         {"defaultcollelem",             tDEFAULTCOLLELEM,           0},
 349         {"defaultvalue",                tDEFAULTVALUE,              0},
 350         {"defaultvtable",               tDEFAULTVTABLE,             0},
 351         {"disable_consistency_check",   tDISABLECONSISTENCYCHECK,   0},
 352         {"displaybind",                 tDISPLAYBIND,               0},
 353         {"dllname",                     tDLLNAME,                   0},
 354         {"dont_free",                   tDONTFREE,                  0},
 355         {"dual",                        tDUAL,                      0},
 356         {"enable_allocate",             tENABLEALLOCATE,            0},
 357         {"encode",                      tENCODE,                    0},
 358         {"endpoint",                    tENDPOINT,                  0},
 359         {"entry",                       tENTRY,                     0},
 360         {"eventadd",                    tEVENTADD,                  1},
 361         {"eventremove",                 tEVENTREMOVE,               1},
 362         {"exclusiveto",                 tEXCLUSIVETO,               1},
 363         {"explicit_handle",             tEXPLICITHANDLE,            0},
 364         {"fault_status",                tFAULTSTATUS,               0},
 365         {"flags",                       tFLAGS,                     1},
 366         {"force_allocate",              tFORCEALLOCATE,             0},
 367         {"free",                        tFREE,                      0},
 368         {"handle",                      tHANDLE,                    0},
 369         {"helpcontext",                 tHELPCONTEXT,               0},
 370         {"helpfile",                    tHELPFILE,                  0},
 371         {"helpstring",                  tHELPSTRING,                0},
 372         {"helpstringcontext",           tHELPSTRINGCONTEXT,         0},
 373         {"helpstringdll",               tHELPSTRINGDLL,             0},
 374         {"hidden",                      tHIDDEN,                    0},
 375         {"id",                          tID,                        0},
 376         {"idempotent",                  tIDEMPOTENT,                0},
 377         {"ignore",                      tIGNORE,                    0},
 378         {"iid_is",                      tIIDIS,                     0},
 379         {"immediatebind",               tIMMEDIATEBIND,             0},
 380         {"implicit_handle",             tIMPLICITHANDLE,            0},
 381         {"in",                          tIN,                        0},
 382         {"in_line",                     tIN_LINE,                   0},
 383         {"input_sync",                  tINPUTSYNC,                 0},
 384         {"lcid",                        tLCID,                      0},
 385         {"length_is",                   tLENGTHIS,                  0},
 386         {"licensed",                    tLICENSED,                  0},
 387         {"local",                       tLOCAL,                     0},
 388         {"marshaling_behavior",         tMARSHALINGBEHAVIOR,        1},
 389         {"maybe",                       tMAYBE,                     0},
 390         {"message",                     tMESSAGE,                   0},
 391         {"mta" ,                        tMTA,                       0},
 392         {"neutral",                     tNEUTRAL,                   0},
 393         {"nocode",                      tNOCODE,                    0},
 394         {"nonbrowsable",                tNONBROWSABLE,              0},
 395         {"noncreatable",                tNONCREATABLE,              0},
 396         {"none",                        tNONE,                      1},
 397         {"nonextensible",               tNONEXTENSIBLE,             0},
 398         {"notify",                      tNOTIFY,                    0},
 399         {"notify_flag",                 tNOTIFYFLAG,                0},
 400         {"object",                      tOBJECT,                    0},
 401         {"odl",                         tODL,                       0},
 402         {"oleautomation",               tOLEAUTOMATION,             0},
 403         {"optimize",                    tOPTIMIZE,                  0},
 404         {"optional",                    tOPTIONAL,                  0},
 405         {"out",                         tOUT,                       0},
 406         {"overload",                    tOVERLOAD,                  0},
 407         {"partial_ignore",              tPARTIALIGNORE,             0},
 408         {"pointer_default",             tPOINTERDEFAULT,            0},
 409         {"progid",                      tPROGID,                    0},
 410         {"propget",                     tPROPGET,                   0},
 411         {"propput",                     tPROPPUT,                   0},
 412         {"propputref",                  tPROPPUTREF,                0},
 413         {"proxy",                       tPROXY,                     0},
 414         {"ptr",                         tPTR,                       0},
 415         {"public",                      tPUBLIC,                    0},
 416         {"range",                       tRANGE,                     0},
 417         {"readonly",                    tREADONLY,                  0},
 418         {"ref",                         tREF,                       0},
 419         {"represent_as",                tREPRESENTAS,               0},
 420         {"requestedit",                 tREQUESTEDIT,               0},
 421         {"restricted",                  tRESTRICTED,                0},
 422         {"retval",                      tRETVAL,                    0},
 423         {"single",                      tSINGLE,                    0},
 424         {"single_node",                 tSINGLENODE,                0},
 425         {"size_is",                     tSIZEIS,                    0},
 426         {"source",                      tSOURCE,                    0},
 427         {"standard",                    tSTANDARD,                  1},
 428         {"static",                      tSTATIC,                    1},
 429         {"strict_context_handle",       tSTRICTCONTEXTHANDLE,       0},
 430         {"string",                      tSTRING,                    0},
 431         {"switch_is",                   tSWITCHIS,                  0},
 432         {"switch_type",                 tSWITCHTYPE,                0},
 433         {"threading",                   tTHREADING,                 0},
 434         {"transmit_as",                 tTRANSMITAS,                0},
 435         {"uidefault",                   tUIDEFAULT,                 0},
 436         {"unique",                      tUNIQUE,                    0},
 437         {"user_marshal",                tUSERMARSHAL,               0},
 438         {"usesgetlasterror",            tUSESGETLASTERROR,          0},
 439         {"uuid",                        tUUID,                      0},
 440         {"v1_enum",                     tV1ENUM,                    0},
 441         {"vararg",                      tVARARG,                    0},
 442         {"version",                     tVERSION,                   0},
 443         {"vi_progid",                   tVIPROGID,                  0},
 444         {"wire_marshal",                tWIREMARSHAL,               0},
 445 };
 446
 447 /* attributes TODO:
 448     first_is
 449     last_is
 450     max_is
 451     min_is
 452 */
 453
 454 #define KWP(p) ((const struct keyword *)(p))
 455
 456 static int kw_cmp_func(const void *s1, const void *s2)
 457 {
 458         return strcmp(KWP(s1)->kw, KWP(s2)->kw);
 459 }
 460
 461 static int kw_token(const char *kw)
 462 {
 463         struct keyword key, *kwp;
 464         key.kw = kw;
 465         kwp = bsearch(&key, keywords, NKEYWORDS, sizeof(keywords[0]), kw_cmp_func);
 466         if (kwp && (!kwp->winrt_only || winrt_mode)) {
 467                 parser_lval.str = xstrdup(kwp->kw);
 468                 return kwp->token;
 469         }
 470         parser_lval.str = xstrdup(kw);
 471         return is_type(kw) ? aKNOWNTYPE : aIDENTIFIER;
 472 }
 473
 474 static int attr_token(const char *kw)
 475 {
 476         struct keyword key, *kwp;
 477         key.kw = kw;
 478         kwp = bsearch(&key, attr_keywords, sizeof(attr_keywords)/sizeof(attr_keywords[0]),
 479                       sizeof(attr_keywords[0]), kw_cmp_func);
 480         if (kwp && (!kwp->winrt_only || winrt_mode)) {
 481             parser_lval.str = xstrdup(kwp->kw);
 482             return kwp->token;
 483         }
 484         return kw_token(kw);
 485 }
 486
 487 static void addcchar(char c)
 488 {
 489         if(cbufidx >= cbufalloc)
 490         {
 491                 cbufalloc += 1024;
 492                 cbuffer = xrealloc(cbuffer, cbufalloc * sizeof(cbuffer[0]));
 493                 if(cbufalloc > 65536)
 494                         parser_warning("Reallocating string buffer larger than 64kB\n");
 495         }
 496         cbuffer[cbufidx++] = c;
 497 }
 498
 499 static char *get_buffered_cstring(void)
 500 {
 501         addcchar(0);
 502         return xstrdup(cbuffer);
 503 }
 504
 505 void pop_import(void)
 506 {
 507         int ptr = import_stack_ptr-1;
 508
 509         fclose(yyin);
 510         yy_delete_buffer( YY_CURRENT_BUFFER );
 511         yy_switch_to_buffer( import_stack[ptr].state );
 512         input_name = import_stack[ptr].input_name;
 513         line_number = import_stack[ptr].line_number;
 514         import_stack_ptr--;
 515 }
 516
 517 struct imports {
 518     char *name;
 519     struct imports *next;
 520 } *first_import;
 521
 522 int do_import(char *fname)
 523 {
 524     FILE *f;
 525     char *path, *name;
 526     struct imports *import;
 527     int ptr = import_stack_ptr;
 528     int ret;
 529
 530     import = first_import;
 531     while (import && strcmp(import->name, fname))
 532         import = import->next;
 533     if (import) return 0; /* already imported */
 534
 535     import = xmalloc(sizeof(struct imports));
 536     import->name = xstrdup(fname);
 537     import->next = first_import;
 538     first_import = import;
 539
 540     /* don't search for a file name with a path in the include directories,
 541      * for compatibility with MIDL */
 542     if (strchr( fname, '/' ) || strchr( fname, '\\' ))
 543         path = xstrdup( fname );
 544     else if (!(path = wpp_find_include( fname, input_name )))
 545         error_loc("Unable to open include file %s\n", fname);
 546
 547     if (import_stack_ptr == MAX_IMPORT_DEPTH)
 548         error_loc("Exceeded max import depth\n");
 549
 550     import_stack[ptr].input_name = input_name;
 551     import_stack[ptr].line_number = line_number;
 552     import_stack_ptr++;
 553     input_name = path;
 554     line_number = 1;
 555
 556     name = make_temp_file( "widl-pp", NULL );
 557     if (!(f = fopen(name, "wt")))
 558         error("Could not open fd %s for writing\n", name);
 559
 560     ret = wpp_parse( path, f );
 561     fclose( f );
 562     if (ret) exit(1);
 563
 564     if((f = fopen(name, "r")) == NULL)
 565         error_loc("Unable to open %s\n", name);
 566
 567     import_stack[ptr].state = YY_CURRENT_BUFFER;
 568     yy_switch_to_buffer(yy_create_buffer(f, YY_BUF_SIZE));
 569     return 1;
 570 }
 571
 572 void abort_import(void)
 573 {
 574         int ptr;
 575
 576         for (ptr=0; ptr<import_stack_ptr; ptr++)
 577                 unlink(import_stack[ptr].temp_name);
 578 }
 579
 580 static void switch_to_acf(void)
 581 {
 582     int ptr = import_stack_ptr;
 583     int ret;
 584     char *name;
 585     FILE *f;
 586
 587     assert(import_stack_ptr == 0);
 588
 589     input_name = acf_name;
 590     acf_name = NULL;
 591     line_number = 1;
 592
 593     name = make_temp_file( "widl-acf", NULL );
 594     if (!(f = fopen(name, "wt")))
 595         error("Could not open fd %s for writing\n", name);
 596
 597     ret = wpp_parse(input_name, f);
 598     fclose(f);
 599     if (ret) exit(1);
 600
 601     if((f = fopen(name, "r")) == NULL)
 602         error_loc("Unable to open %s\n", name);
 603
 604     import_stack[ptr].state = YY_CURRENT_BUFFER;
 605     yy_switch_to_buffer(yy_create_buffer(f, YY_BUF_SIZE));
 606 }
 607
 608 static void warning_disable(int warning)
 609 {
 610     warning_t *warning_entry;
 611     LIST_FOR_EACH_ENTRY(warning_entry, disabled_warnings, warning_t, entry)
 612         if(warning_entry->num == warning)
 613             return;
 614     warning_entry = xmalloc( sizeof(*warning_entry) );
 615     warning_entry->num = warning;
 616     list_add_tail(disabled_warnings, &warning_entry->entry);
 617 }
 618
 619 static void warning_enable(int warning)
 620 {
 621     warning_t *warning_entry;
 622     LIST_FOR_EACH_ENTRY(warning_entry, disabled_warnings, warning_t, entry)
 623         if(warning_entry->num == warning)
 624         {
 625             list_remove(&warning_entry->entry);
 626             free(warning_entry);
 627             break;
 628         }
 629 }
 630
 631 int do_warning(const char *toggle, warning_list_t *wnum)
 632 {
 633     warning_t *warning, *next;
 634     int ret = 1;
 635     if(!disabled_warnings)
 636     {
 637         disabled_warnings = xmalloc( sizeof(*disabled_warnings) );
 638         list_init( disabled_warnings );
 639     }
 640
 641     if(!strcmp(toggle, "disable"))
 642         LIST_FOR_EACH_ENTRY(warning, wnum, warning_t, entry)
 643             warning_disable(warning->num);
 644     else if(!strcmp(toggle, "enable") || !strcmp(toggle, "default"))
 645         LIST_FOR_EACH_ENTRY(warning, wnum, warning_t, entry)
 646             warning_enable(warning->num);
 647     else
 648         ret = 0;
 649
 650     LIST_FOR_EACH_ENTRY_SAFE(warning, next, wnum, warning_t, entry)
 651         free(warning);
 652     return ret;
 653 }
 654
 655 int is_warning_enabled(int warning)
 656 {
 657     warning_t *warning_entry;
 658     if(!disabled_warnings)
 659         return 1;
 660     LIST_FOR_EACH_ENTRY(warning_entry, disabled_warnings, warning_t, entry)
 661         if(warning_entry->num == warning)
 662             return 0;
 663     return 1;
 664 }