libs/wpp/preproc.c

   1 /*
   2  * Copyright 1998 Bertho A. Stultiens (BS)
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  17  */
  18
  19 #include "config.h"
  20 #include "wine/port.h"
  21
  22 #include <assert.h>
  23 #include <ctype.h>
  24 #include <fcntl.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <stdarg.h>
  29 #ifdef HAVE_UNISTD_H
  30 # include <unistd.h>
  31 #endif
  32
  33 #include "wine/wpp.h"
  34 #include "wpp_private.h"
  35
  36 struct pp_status pp_status;
  37
  38 #define HASHKEY         2039
  39
  40 typedef struct pp_def_state
  41 {
  42     struct pp_def_state *next;
  43     pp_entry_t          *defines[HASHKEY];
  44 } pp_def_state_t;
  45
  46 static pp_def_state_t *pp_def_state;
  47
  48 #define MAXIFSTACK      64
  49 static pp_if_state_t if_stack[MAXIFSTACK];
  50 static int if_stack_idx = 0;
  51
  52 #if 0
  53 void pp_print_status(void) __attribute__((destructor));
  54 void pp_print_status(void)
  55 {
  56         int i;
  57         int sum;
  58         int total = 0;
  59         pp_entry_t *ppp;
  60
  61         fprintf(stderr, "Defines statistics:\n");
  62         for(i = 0; i < HASHKEY; i++)
  63         {
  64                 sum = 0;
  65                 for(ppp = pp_def_state->defines[i]; ppp; ppp = ppp->next)
  66                         sum++;
  67                 total += sum;
  68                 if (sum) fprintf(stderr, "%4d, %3d\n", i, sum);
  69         }
  70         fprintf(stderr, "Total defines: %d\n", total);
  71 }
  72 #endif
  73
  74 void *pp_xmalloc(size_t size)
  75 {
  76     void *res;
  77
  78     assert(size > 0);
  79     res = malloc(size);
  80     if(res == NULL)
  81     {
  82         /* Set the error flag */
  83         pp_status.state = 1;
  84     }
  85     return res;
  86 }
  87
  88 void *pp_xrealloc(void *p, size_t size)
  89 {
  90     void *res;
  91
  92     assert(size > 0);
  93     res = realloc(p, size);
  94     if(res == NULL)
  95     {
  96         /* Set the error flag */
  97         pp_status.state = 1;
  98     }
  99     return res;
 100 }
 101
 102 char *pp_xstrdup(const char *str)
 103 {
 104         char *s;
 105         int len;
 106
 107         assert(str != NULL);
 108         len = strlen(str)+1;
 109         s = pp_xmalloc(len);
 110         if(!s)
 111                 return NULL;
 112         return memcpy(s, str, len);
 113 }
 114
 115 static char *wpp_default_lookup(const char *name, int type, const char *parent_name,
 116                                 char **include_path, int include_path_count)
 117 {
 118     char *cpy;
 119     char *cptr;
 120     char *path;
 121     const char *ccptr;
 122     int i, fd;
 123
 124     cpy = pp_xmalloc(strlen(name)+1);
 125     if(!cpy)
 126         return NULL;
 127     cptr = cpy;
 128
 129     for(ccptr = name; *ccptr; ccptr++)
 130     {
 131         /* Convert to forward slash */
 132         if(*ccptr == '\\') {
 133             /* kill double backslash */
 134             if(ccptr[1] == '\\')
 135                 ccptr++;
 136             *cptr = '/';
 137         }else {
 138             *cptr = *ccptr;
 139         }
 140         cptr++;
 141     }
 142     *cptr = '\0';
 143
 144     if(type && parent_name)
 145     {
 146         /* Search directory of parent include and then -I path */
 147         const char *p;
 148
 149         if ((p = strrchr( parent_name, '/' ))) p++;
 150         else p = parent_name;
 151         path = pp_xmalloc( (p - parent_name) + strlen(cpy) + 1 );
 152         if(!path)
 153         {
 154             free(cpy);
 155             return NULL;
 156         }
 157         memcpy( path, parent_name, p - parent_name );
 158         strcpy( path + (p - parent_name), cpy );
 159         fd = open( path, O_RDONLY );
 160         if (fd != -1)
 161         {
 162             close( fd );
 163             free( cpy );
 164             return path;
 165         }
 166         free( path );
 167     }
 168     /* Search -I path */
 169     for(i = 0; i < include_path_count; i++)
 170     {
 171         path = pp_xmalloc(strlen(include_path[i]) + strlen(cpy) + 2);
 172         if(!path)
 173         {
 174             free(cpy);
 175             return NULL;
 176         }
 177         strcpy(path, include_path[i]);
 178         strcat(path, "/");
 179         strcat(path, cpy);
 180         fd = open( path, O_RDONLY );
 181         if (fd != -1)
 182         {
 183             close( fd );
 184             free( cpy );
 185             return path;
 186         }
 187         free( path );
 188     }
 189     free( cpy );
 190     return NULL;
 191 }
 192
 193 static void *wpp_default_open(const char *filename, int type) {
 194     return fopen(filename,"rt");
 195 }
 196
 197 static void wpp_default_close(void *file) {
 198     fclose(file);
 199 }
 200
 201 static int wpp_default_read(void *file, char *buffer, unsigned int len){
 202     return fread(buffer, 1, len, file);
 203 }
 204
 205 static void wpp_default_write( const char *buffer, unsigned int len ) {
 206     fwrite(buffer, 1, len, ppy_out);
 207 }
 208
 209 /* Don't comment on the hash, it's primitive but functional... */
 210 static int pphash(const char *str)
 211 {
 212         int sum = 0;
 213         while(*str)
 214                 sum += *str++;
 215         return sum % HASHKEY;
 216 }
 217
 218 pp_entry_t *pplookup(const char *ident)
 219 {
 220         int idx;
 221         pp_entry_t *ppp;
 222
 223         if(!ident)
 224                 return NULL;
 225         idx = pphash(ident);
 226         for(ppp = pp_def_state->defines[idx]; ppp; ppp = ppp->next)
 227         {
 228                 if(!strcmp(ident, ppp->ident))
 229                         return ppp;
 230         }
 231         return NULL;
 232 }
 233
 234 static void free_pp_entry( pp_entry_t *ppp, int idx )
 235 {
 236         if(ppp->iep)
 237         {
 238                 if(ppp->iep == pp_includelogiclist)
 239                 {
 240                         pp_includelogiclist = ppp->iep->next;
 241                         if(pp_includelogiclist)
 242                                 pp_includelogiclist->prev = NULL;
 243                 }
 244                 else
 245                 {
 246                         ppp->iep->prev->next = ppp->iep->next;
 247                         if(ppp->iep->next)
 248                                 ppp->iep->next->prev = ppp->iep->prev;
 249                 }
 250                 free(ppp->iep->filename);
 251                 free(ppp->iep);
 252         }
 253
 254         if(pp_def_state->defines[idx] == ppp)
 255         {
 256                 pp_def_state->defines[idx] = ppp->next;
 257                 if(pp_def_state->defines[idx])
 258                         pp_def_state->defines[idx]->prev = NULL;
 259         }
 260         else
 261         {
 262                 ppp->prev->next = ppp->next;
 263                 if(ppp->next)
 264                         ppp->next->prev = ppp->prev;
 265         }
 266
 267         free(ppp);
 268 }
 269
 270 /* push a new (empty) define state */
 271 int pp_push_define_state(void)
 272 {
 273     pp_def_state_t *state = pp_xmalloc( sizeof(*state) );
 274     if(!state)
 275         return 1;
 276
 277     memset( state->defines, 0, sizeof(state->defines) );
 278     state->next = pp_def_state;
 279     pp_def_state = state;
 280     return 0;
 281 }
 282
 283 /* pop the current define state */
 284 void pp_pop_define_state(void)
 285 {
 286     int i;
 287     pp_entry_t *ppp;
 288     pp_def_state_t *state;
 289
 290     for (i = 0; i < HASHKEY; i++)
 291     {
 292         while ((ppp = pp_def_state->defines[i]) != NULL) pp_del_define( ppp->ident );
 293     }
 294     state = pp_def_state;
 295     pp_def_state = state->next;
 296     free( state );
 297 }
 298
 299 void pp_del_define(const char *name)
 300 {
 301         pp_entry_t *ppp;
 302         int idx = pphash(name);
 303
 304         if((ppp = pplookup(name)) == NULL)
 305         {
 306                 if(pp_status.pedantic)
 307                         ppy_warning("%s was not defined", name);
 308                 return;
 309         }
 310
 311         if(pp_status.debug)
 312                 printf("Deleting (%s, %d) <%s>\n", pp_status.input, pp_status.line_number, name);
 313
 314         free( ppp->ident );
 315         free( ppp->subst.text );
 316         free( ppp->filename );
 317         free_pp_entry( ppp, idx );
 318 }
 319
 320 pp_entry_t *pp_add_define(const char *def, const char *text)
 321 {
 322         int len;
 323         char *cptr;
 324         int idx;
 325         pp_entry_t *ppp;
 326
 327         if(!def)
 328                 return NULL;
 329         idx = pphash(def);
 330         if((ppp = pplookup(def)) != NULL)
 331         {
 332                 if(pp_status.pedantic)
 333                         ppy_warning("Redefinition of %s\n\tPrevious definition: %s:%d", def, ppp->filename, ppp->linenumber);
 334                 pp_del_define(def);
 335         }
 336         ppp = pp_xmalloc(sizeof(pp_entry_t));
 337         if(!ppp)
 338                 return NULL;
 339         memset( ppp, 0, sizeof(*ppp) );
 340         ppp->ident = pp_xstrdup(def);
 341         if(!ppp->ident)
 342                 goto error;
 343         ppp->type = def_define;
 344         ppp->subst.text = text ? pp_xstrdup(text) : NULL;
 345         if(text && !ppp->subst.text)
 346                 goto error;
 347         ppp->filename = pp_xstrdup(pp_status.input ? pp_status.input : "<internal or cmdline>");
 348         if(!ppp->filename)
 349                 goto error;
 350         ppp->linenumber = pp_status.input ? pp_status.line_number : 0;
 351         ppp->next = pp_def_state->defines[idx];
 352         pp_def_state->defines[idx] = ppp;
 353         if(ppp->next)
 354                 ppp->next->prev = ppp;
 355         if(ppp->subst.text)
 356         {
 357                 /* Strip trailing white space from subst text */
 358                 len = strlen(ppp->subst.text);
 359                 while(len && strchr(" \t\r\n", ppp->subst.text[len-1]))
 360                 {
 361                         ppp->subst.text[--len] = '\0';
 362                 }
 363                 /* Strip leading white space from subst text */
 364                 for(cptr = ppp->subst.text; *cptr && strchr(" \t\r", *cptr); cptr++)
 365                 ;
 366                 if(ppp->subst.text != cptr)
 367                         memmove(ppp->subst.text, cptr, strlen(cptr)+1);
 368         }
 369         if(pp_status.debug)
 370                 printf("Added define (%s, %d) <%s> to <%s>\n", pp_status.input, pp_status.line_number, ppp->ident, ppp->subst.text ? ppp->subst.text : "(null)");
 371
 372         return ppp;
 373
 374 error:
 375         free(ppp->ident);
 376         free(ppp->subst.text);
 377         free(ppp);
 378         return NULL;
 379 }
 380
 381 pp_entry_t *pp_add_macro(char *id, marg_t *args[], int nargs, mtext_t *exp)
 382 {
 383         int idx;
 384         pp_entry_t *ppp;
 385
 386         if(!id)
 387                 return NULL;
 388         idx = pphash(id);
 389         if((ppp = pplookup(id)) != NULL)
 390         {
 391                 if(pp_status.pedantic)
 392                         ppy_warning("Redefinition of %s\n\tPrevious definition: %s:%d", id, ppp->filename, ppp->linenumber);
 393                 pp_del_define(id);
 394         }
 395         ppp = pp_xmalloc(sizeof(pp_entry_t));
 396         if(!ppp)
 397                 return NULL;
 398         memset( ppp, 0, sizeof(*ppp) );
 399         ppp->ident      = id;
 400         ppp->type       = def_macro;
 401         ppp->margs      = args;
 402         ppp->nargs      = nargs;
 403         ppp->subst.mtext= exp;
 404         ppp->filename = pp_xstrdup(pp_status.input ? pp_status.input : "<internal or cmdline>");
 405         if(!ppp->filename)
 406         {
 407                 free(ppp);
 408                 return NULL;
 409         }
 410         ppp->linenumber = pp_status.input ? pp_status.line_number : 0;
 411         ppp->next       = pp_def_state->defines[idx];
 412         pp_def_state->defines[idx] = ppp;
 413         if(ppp->next)
 414                 ppp->next->prev = ppp;
 415
 416         if(pp_status.debug)
 417         {
 418                 fprintf(stderr, "Added macro (%s, %d) <%s(%d)> to <", pp_status.input, pp_status.line_number, ppp->ident, nargs);
 419                 for(; exp; exp = exp->next)
 420                 {
 421                         switch(exp->type)
 422                         {
 423                         case exp_text:
 424                                 fprintf(stderr, " \"%s\" ", exp->subst.text);
 425                                 break;
 426                         case exp_stringize:
 427                                 fprintf(stderr, " #(%d) ", exp->subst.argidx);
 428                                 break;
 429                         case exp_concat:
 430                                 fprintf(stderr, "##");
 431                                 break;
 432                         case exp_subst:
 433                                 fprintf(stderr, " <%d> ", exp->subst.argidx);
 434                                 break;
 435                         }
 436                 }
 437                 fprintf(stderr, ">\n");
 438         }
 439         return ppp;
 440 }
 441
 442
 443 /*
 444  *-------------------------------------------------------------------------
 445  * Include management
 446  *-------------------------------------------------------------------------
 447  */
 448 #if defined(_WIN32) || defined(__MSDOS__)
 449 #define INCLUDESEPARATOR        ";"
 450 #else
 451 #define INCLUDESEPARATOR        ":"
 452 #endif
 453
 454 static char **includepath;
 455 static int nincludepath = 0;
 456
 457 int wpp_add_include_path(const char *path)
 458 {
 459         char *tok;
 460         char *cpy = pp_xstrdup(path);
 461         if(!cpy)
 462                 return 1;
 463
 464         tok = strtok(cpy, INCLUDESEPARATOR);
 465         while(tok)
 466         {
 467                 if(*tok) {
 468                         char *dir;
 469                         char *cptr;
 470                         char **new_path;
 471
 472                         dir = pp_xstrdup(tok);
 473                         if(!dir)
 474                         {
 475                                 free(cpy);
 476                                 return 1;
 477                         }
 478                         for(cptr = dir; *cptr; cptr++)
 479                         {
 480                                 /* Convert to forward slash */
 481                                 if(*cptr == '\\')
 482                                         *cptr = '/';
 483                         }
 484                         /* Kill eventual trailing '/' */
 485                         if(*(cptr = dir + strlen(dir)-1) == '/')
 486                                 *cptr = '\0';
 487
 488                         /* Add to list */
 489                         new_path = pp_xrealloc(includepath, (nincludepath+1) * sizeof(*includepath));
 490                         if(!new_path)
 491                         {
 492                                 free(dir);
 493                                 free(cpy);
 494                                 return 1;
 495                         }
 496                         includepath = new_path;
 497                         includepath[nincludepath] = dir;
 498                         nincludepath++;
 499                 }
 500                 tok = strtok(NULL, INCLUDESEPARATOR);
 501         }
 502         free(cpy);
 503         return 0;
 504 }
 505
 506 char *wpp_find_include(const char *name, const char *parent_name)
 507 {
 508     return wpp_default_lookup(name, !!parent_name, parent_name, includepath, nincludepath);
 509 }
 510
 511 void *pp_open_include(const char *name, int type, const char *parent_name, char **newpath)
 512 {
 513     char *path;
 514     void *fp;
 515
 516     if (!(path = wpp_callbacks->lookup(name, type, parent_name, includepath,
 517                                        nincludepath))) return NULL;
 518     fp = wpp_callbacks->open(path, type);
 519
 520     if (fp)
 521     {
 522         if (pp_status.debug)
 523             printf("Going to include <%s>\n", path);
 524         if (newpath) *newpath = path;
 525         else free( path );
 526         return fp;
 527     }
 528     free( path );
 529     return NULL;
 530 }
 531
 532 /*
 533  *-------------------------------------------------------------------------
 534  * #if, #ifdef, #ifndef, #else, #elif and #endif state management
 535  *
 536  * #if state transitions are made on basis of the current TOS and the next
 537  * required state. The state transitions are required to housekeep because
 538  * #if:s can be nested. The ignore case is activated to prevent output from
 539  * within a false clause.
 540  * Some special cases come from the fact that the #elif cases are not
 541  * binary, but three-state. The problem is that all other elif-cases must
 542  * be false when one true one has been found. A second problem is that the
 543  * #else clause is a final clause. No extra #else:s may follow.
 544  *
 545  * The states mean:
 546  * if_true      Process input to output
 547  * if_false     Process input but no output
 548  * if_ignore    Process input but no output
 549  * if_elif      Process input but no output
 550  * if_elsefalse Process input but no output
 551  * if_elsettrue Process input to output
 552  *
 553  * The possible state-sequences are [state(stack depth)] (rest can be deduced):
 554  *      TOS             #if 1           #else                   #endif
 555  *      if_true(n)      if_true(n+1)    if_elsefalse(n+1)
 556  *      if_false(n)     if_ignore(n+1)  if_ignore(n+1)
 557  *      if_elsetrue(n)  if_true(n+1)    if_elsefalse(n+1)
 558  *      if_elsefalse(n) if_ignore(n+1)  if_ignore(n+1)
 559  *      if_elif(n)      if_ignore(n+1)  if_ignore(n+1)
 560  *      if_ignore(n)    if_ignore(n+1)  if_ignore(n+1)
 561  *
 562  *      TOS             #if 1           #elif 0         #else           #endif
 563  *      if_true(n)      if_true(n+1)    if_elif(n+1)    if_elif(n+1)
 564  *      if_false(n)     if_ignore(n+1)  if_ignore(n+1)  if_ignore(n+1)
 565  *      if_elsetrue(n)  if_true(n+1)    if_elif(n+1)    if_elif(n+1)
 566  *      if_elsefalse(n) if_ignore(n+1)  if_ignore(n+1)  if_ignore(n+1)
 567  *      if_elif(n)      if_ignore(n+1)  if_ignore(n+1)  if_ignore(n+1)
 568  *      if_ignore(n)    if_ignore(n+1)  if_ignore(n+1)  if_ignore(n+1)
 569  *
 570  *      TOS             #if 0           #elif 1         #else           #endif
 571  *      if_true(n)      if_false(n+1)   if_true(n+1)    if_elsefalse(n+1)
 572  *      if_false(n)     if_ignore(n+1)  if_ignore(n+1)  if_ignore(n+1)
 573  *      if_elsetrue(n)  if_false(n+1)   if_true(n+1)    if_elsefalse(n+1)
 574  *      if_elsefalse(n) if_ignore(n+1)  if_ignore(n+1)  if_ignore(n+1)
 575  *      if_elif(n)      if_ignore(n+1)  if_ignore(n+1)  if_ignore(n+1)
 576  *      if_ignore(n)    if_ignore(n+1)  if_ignore(n+1)  if_ignore(n+1)
 577  *
 578  *-------------------------------------------------------------------------
 579  */
 580 static const char * const pp_if_state_str[] = {
 581         "if_false",
 582         "if_true",
 583         "if_elif",
 584         "if_elsefalse",
 585         "if_elsetrue",
 586         "if_ignore"
 587 };
 588
 589 void pp_push_if(pp_if_state_t s)
 590 {
 591         if(if_stack_idx >= MAXIFSTACK)
 592                 pp_internal_error(__FILE__, __LINE__, "#if-stack overflow; #{if,ifdef,ifndef} nested too deeply (> %d)", MAXIFSTACK);
 593
 594         if(pp_flex_debug)
 595                 fprintf(stderr, "Push if %s:%d: %s(%d) -> %s(%d)\n", pp_status.input, pp_status.line_number, pp_if_state_str[pp_if_state()], if_stack_idx, pp_if_state_str[s], if_stack_idx+1);
 596
 597         if_stack[if_stack_idx++] = s;
 598
 599         switch(s)
 600         {
 601         case if_true:
 602         case if_elsetrue:
 603                 break;
 604         case if_false:
 605         case if_elsefalse:
 606         case if_elif:
 607         case if_ignore:
 608                 pp_push_ignore_state();
 609                 break;
 610         default:
 611                 pp_internal_error(__FILE__, __LINE__, "Invalid pp_if_state (%d)", (int)pp_if_state());
 612         }
 613 }
 614
 615 pp_if_state_t pp_pop_if(void)
 616 {
 617         if(if_stack_idx <= 0)
 618         {
 619                 ppy_error("#{endif,else,elif} without #{if,ifdef,ifndef} (#if-stack underflow)");
 620                 return if_error;
 621         }
 622
 623         switch(pp_if_state())
 624         {
 625         case if_true:
 626         case if_elsetrue:
 627                 break;
 628         case if_false:
 629         case if_elsefalse:
 630         case if_elif:
 631         case if_ignore:
 632                 pp_pop_ignore_state();
 633                 break;
 634         default:
 635                 pp_internal_error(__FILE__, __LINE__, "Invalid pp_if_state (%d)", (int)pp_if_state());
 636         }
 637
 638         if(pp_flex_debug)
 639                 fprintf(stderr, "Pop if %s:%d: %s(%d) -> %s(%d)\n",
 640                                 pp_status.input,
 641                                 pp_status.line_number,
 642                                 pp_if_state_str[pp_if_state()],
 643                                 if_stack_idx,
 644                                 pp_if_state_str[if_stack[if_stack_idx <= 1 ? if_true : if_stack_idx-2]],
 645                                 if_stack_idx-1);
 646
 647         return if_stack[--if_stack_idx];
 648 }
 649
 650 pp_if_state_t pp_if_state(void)
 651 {
 652         if(!if_stack_idx)
 653                 return if_true;
 654         else
 655                 return if_stack[if_stack_idx-1];
 656 }
 657
 658
 659 void pp_next_if_state(int i)
 660 {
 661         switch(pp_if_state())
 662         {
 663         case if_true:
 664         case if_elsetrue:
 665                 pp_push_if(i ? if_true : if_false);
 666                 break;
 667         case if_false:
 668         case if_elsefalse:
 669         case if_elif:
 670         case if_ignore:
 671                 pp_push_if(if_ignore);
 672                 break;
 673         default:
 674                 pp_internal_error(__FILE__, __LINE__, "Invalid pp_if_state (%d) in #{if,ifdef,ifndef} directive", (int)pp_if_state());
 675         }
 676 }
 677
 678 int pp_get_if_depth(void)
 679 {
 680         return if_stack_idx;
 681 }
 682
 683 /* #define WANT_NEAR_INDICATION */
 684
 685 static void generic_msg(const char *s, const char *t, const char *n, va_list ap)
 686 {
 687         fprintf(stderr, "%s:%d:%d: %s: ", pp_status.input ? pp_status.input : "stdin",
 688                 pp_status.line_number, pp_status.char_number, t);
 689         vfprintf(stderr, s, ap);
 690 #ifdef WANT_NEAR_INDICATION
 691         {
 692                 char *cpy, *p;
 693                 if(n)
 694                 {
 695                         cpy = pp_xstrdup(n);
 696                         if(!cpy)
 697                                 goto end;
 698                         for (p = cpy; *p; p++) if(!isprint(*p)) *p = ' ';
 699                         fprintf(stderr, " near '%s'", cpy);
 700                         free(cpy);
 701                 }
 702         }
 703 end:
 704 #endif
 705         fprintf(stderr, "\n");
 706 }
 707
 708 static void wpp_default_error(const char *file, int line, int col, const char *near, const char *msg, va_list ap)
 709 {
 710         generic_msg(msg, "Error", near, ap);
 711         exit(1);
 712 }
 713
 714 static void wpp_default_warning(const char *file, int line, int col, const char *near, const char *msg, va_list ap)
 715 {
 716         generic_msg(msg, "Warning", near, ap);
 717 }
 718
 719 static const struct wpp_callbacks default_callbacks =
 720 {
 721         wpp_default_lookup,
 722         wpp_default_open,
 723         wpp_default_close,
 724         wpp_default_read,
 725         wpp_default_write,
 726         wpp_default_error,
 727         wpp_default_warning,
 728 };
 729
 730 const struct wpp_callbacks *wpp_callbacks = &default_callbacks;
 731
 732 int ppy_error(const char *s, ...)
 733 {
 734         va_list ap;
 735         va_start(ap, s);
 736         wpp_callbacks->error(pp_status.input, pp_status.line_number, pp_status.char_number, ppy_text, s, ap);
 737         va_end(ap);
 738         pp_status.state = 1;
 739         return 1;
 740 }
 741
 742 int ppy_warning(const char *s, ...)
 743 {
 744         va_list ap;
 745         va_start(ap, s);
 746         wpp_callbacks->warning(pp_status.input, pp_status.line_number, pp_status.char_number, ppy_text, s, ap);
 747         va_end(ap);
 748         return 0;
 749 }
 750
 751 void pp_internal_error(const char *file, int line, const char *s, ...)
 752 {
 753         va_list ap;
 754         va_start(ap, s);
 755         fprintf(stderr, "Internal error (please report) %s %d: ", file, line);
 756         vfprintf(stderr, s, ap);
 757         fprintf(stderr, "\n");
 758         va_end(ap);
 759         exit(3);
 760 }