sunrpc/rpc_scan.c

   1 /*
   2  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   3  * unrestricted use provided that this legend is included on all tape
   4  * media and as a part of the software program in whole or part.  Users
   5  * may copy or modify Sun RPC without charge, but are not authorized
   6  * to license or distribute it to anyone else except as part of a product or
   7  * program developed by the user or with the express written consent of
   8  * Sun Microsystems, Inc.
   9  *
  10  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  11  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  12  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  13  *
  14  * Sun RPC is provided with no support and without any obligation on the
  15  * part of Sun Microsystems, Inc. to assist in its use, correction,
  16  * modification or enhancement.
  17  *
  18  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  19  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  20  * OR ANY PART THEREOF.
  21  *
  22  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  23  * or profits or other special, indirect and consequential damages, even if
  24  * Sun has been advised of the possibility of such damages.
  25  *
  26  * Sun Microsystems, Inc.
  27  * 2550 Garcia Avenue
  28  * Mountain View, California  94043
  29  */
  30
  31 /*
  32  * From: @(#)rpc_scan.c 1.11 89/02/22 (C) 1987 SMI
  33  */
  34 char scan_rcsid[] =
  35   "$Id$";
  36
  37 /*
  38  * rpc_scan.c, Scanner for the RPC protocol compiler
  39  * Copyright (C) 1987, Sun Microsystems, Inc.
  40  */
  41 #include <stdio.h>
  42 #include <ctype.h>
  43 #include <string.h>
  44 #include <libintl.h>
  45 #include "rpc_scan.h"
  46 #include "rpc_parse.h"
  47 #include "rpc_util.h"
  48 #include "proto.h"
  49
  50 #define startcomment(where) (where[0] == '/' && where[1] == '*')
  51 #define endcomment(where) (where[-1] == '*' && where[0] == '/')
  52
  53 static int pushed = 0;          /* is a token pushed */
  54 static token lasttok;           /* last token, if pushed */
  55
  56 static void unget_token (token * tokp);
  57 static void findstrconst (const char **str, const char **val);
  58 static void findchrconst (const char **str, const char **val);
  59 static void findconst (const char **str, const char **val);
  60 static void findkind (const char **mark, token * tokp);
  61 static int cppline (const char *line);
  62 static int directive (const char *line);
  63 static void printdirective (const char *line);
  64 static void docppline (const char *line, int *lineno, const char **fname);
  65
  66 /*
  67  * scan expecting 1 given token
  68  */
  69 void
  70 scan (tok_kind expect, token * tokp)
  71 {
  72   get_token (tokp);
  73   if (tokp->kind != expect)
  74     expected1 (expect);
  75 }
  76
  77 /*
  78  * scan expecting any of the 2 given tokens
  79  */
  80 void
  81 scan2 (tok_kind expect1, tok_kind expect2, token * tokp)
  82 {
  83   get_token (tokp);
  84   if (tokp->kind != expect1 && tokp->kind != expect2)
  85     {
  86       expected2 (expect1, expect2);
  87     }
  88 }
  89
  90 /*
  91  * scan expecting any of the 3 given token
  92  */
  93 void
  94 scan3 (tok_kind expect1, tok_kind expect2, tok_kind expect3, token * tokp)
  95 {
  96   get_token (tokp);
  97   if (tokp->kind != expect1 && tokp->kind != expect2
  98       && tokp->kind != expect3)
  99     {
 100       expected3 (expect1, expect2, expect3);
 101     }
 102 }
 103
 104 /*
 105  * scan expecting a constant, possibly symbolic
 106  */
 107 void
 108 scan_num (token *tokp)
 109 {
 110   get_token (tokp);
 111   switch (tokp->kind)
 112     {
 113     case TOK_IDENT:
 114       break;
 115     default:
 116       error (_("constant or identifier expected"));
 117     }
 118 }
 119
 120 /*
 121  * Peek at the next token
 122  */
 123 void
 124 peek (token *tokp)
 125 {
 126   get_token (tokp);
 127   unget_token (tokp);
 128 }
 129
 130 /*
 131  * Peek at the next token and scan it if it matches what you expect
 132  */
 133 int
 134 peekscan (tok_kind expect, token *tokp)
 135 {
 136   peek (tokp);
 137   if (tokp->kind == expect)
 138     {
 139       get_token (tokp);
 140       return 1;
 141     }
 142   return 0;
 143 }
 144
 145 /*
 146  * Get the next token, printing out any directive that are encountered.
 147  */
 148 void
 149 get_token (token *tokp)
 150 {
 151   int commenting;
 152
 153   if (pushed)
 154     {
 155       pushed = 0;
 156       *tokp = lasttok;
 157       return;
 158     }
 159   commenting = 0;
 160   for (;;)
 161     {
 162       if (*where == 0)
 163         {
 164           for (;;)
 165             {
 166               if (!fgets (curline, MAXLINESIZE, fin))
 167                 {
 168                   tokp->kind = TOK_EOF;
 169                   *curline = 0;
 170                   where = curline;
 171                   return;
 172                 }
 173               linenum++;
 174               if (commenting)
 175                 {
 176                   break;
 177                 }
 178               else if (cppline (curline))
 179                 {
 180                   docppline (curline, &linenum,
 181                              &infilename);
 182                 }
 183               else if (directive (curline))
 184                 {
 185                   printdirective (curline);
 186                 }
 187               else
 188                 {
 189                   break;
 190                 }
 191             }
 192           where = curline;
 193         }
 194       else if (isspace (*where))
 195         {
 196           while (isspace (*where))
 197             {
 198               where++;          /* eat */
 199             }
 200         }
 201       else if (commenting)
 202         {
 203           for (where++; *where; where++)
 204             {
 205               if (endcomment (where))
 206                 {
 207                   where++;
 208                   commenting--;
 209                   break;
 210                 }
 211             }
 212         }
 213       else if (startcomment (where))
 214         {
 215           where += 2;
 216           commenting++;
 217         }
 218       else
 219         {
 220           break;
 221         }
 222     }
 223
 224   /*
 225    * 'where' is not whitespace, comment or directive Must be a token!
 226    */
 227   switch (*where)
 228     {
 229     case ':':
 230       tokp->kind = TOK_COLON;
 231       where++;
 232       break;
 233     case ';':
 234       tokp->kind = TOK_SEMICOLON;
 235       where++;
 236       break;
 237     case ',':
 238       tokp->kind = TOK_COMMA;
 239       where++;
 240       break;
 241     case '=':
 242       tokp->kind = TOK_EQUAL;
 243       where++;
 244       break;
 245     case '*':
 246       tokp->kind = TOK_STAR;
 247       where++;
 248       break;
 249     case '[':
 250       tokp->kind = TOK_LBRACKET;
 251       where++;
 252       break;
 253     case ']':
 254       tokp->kind = TOK_RBRACKET;
 255       where++;
 256       break;
 257     case '{':
 258       tokp->kind = TOK_LBRACE;
 259       where++;
 260       break;
 261     case '}':
 262       tokp->kind = TOK_RBRACE;
 263       where++;
 264       break;
 265     case '(':
 266       tokp->kind = TOK_LPAREN;
 267       where++;
 268       break;
 269     case ')':
 270       tokp->kind = TOK_RPAREN;
 271       where++;
 272       break;
 273     case '<':
 274       tokp->kind = TOK_LANGLE;
 275       where++;
 276       break;
 277     case '>':
 278       tokp->kind = TOK_RANGLE;
 279       where++;
 280       break;
 281
 282     case '"':
 283       tokp->kind = TOK_STRCONST;
 284       findstrconst (&where, &tokp->str);
 285       break;
 286     case '\'':
 287       tokp->kind = TOK_CHARCONST;
 288       findchrconst (&where, &tokp->str);
 289       break;
 290
 291     case '-':
 292     case '0':
 293     case '1':
 294     case '2':
 295     case '3':
 296     case '4':
 297     case '5':
 298     case '6':
 299     case '7':
 300     case '8':
 301     case '9':
 302       tokp->kind = TOK_IDENT;
 303       findconst (&where, &tokp->str);
 304       break;
 305
 306     default:
 307       if (!(isalpha (*where) || *where == '_'))
 308         {
 309           char buf[100];
 310           char *p;
 311
 312           s_print (buf, _("illegal character in file: "));
 313           p = buf + strlen (buf);
 314           if (isprint (*where))
 315             {
 316               s_print (p, "%c", *where);
 317             }
 318           else
 319             {
 320               s_print (p, "%d", *where);
 321             }
 322           error (buf);
 323         }
 324       findkind (&where, tokp);
 325       break;
 326     }
 327 }
 328
 329 static void
 330 unget_token (token * tokp)
 331 {
 332   lasttok = *tokp;
 333   pushed = 1;
 334 }
 335
 336 static void
 337 findstrconst (const char **str, const char **val)
 338 {
 339   const char *p;
 340   char *tmp;
 341   int size;
 342
 343   p = *str;
 344   do
 345     {
 346       p++;
 347     }
 348   while (*p && *p != '"');
 349   if (*p == 0)
 350     {
 351       error (_("unterminated string constant"));
 352     }
 353   p++;
 354   size = p - *str;
 355   tmp = alloc (size + 1);
 356   strncpy (tmp, *str, size);
 357   tmp[size] = 0;
 358   *val = tmp;
 359   *str = p;
 360 }
 361
 362 static void
 363 findchrconst (const char **str, const char **val)
 364 {
 365   const char *p;
 366   char *tmp;
 367   int size;
 368
 369   p = *str;
 370   do
 371     {
 372       p++;
 373     }
 374   while (*p && *p != '\'');
 375   if (*p == 0)
 376     {
 377       error (_("unterminated string constant"));
 378     }
 379   p++;
 380   size = p - *str;
 381   if (size != 3)
 382     {
 383       error (_("empty char string"));
 384     }
 385   tmp = alloc (size + 1);
 386   strncpy (tmp, *str, size);
 387   tmp[size] = 0;
 388   *val = tmp;
 389   *str = p;
 390 }
 391
 392 static void
 393 findconst (const char **str, const char **val)
 394 {
 395   const char *p;
 396   char *tmp;
 397   int size;
 398
 399   p = *str;
 400   if (*p == '0' && *(p + 1) == 'x')
 401     {
 402       p++;
 403       do
 404         {
 405           p++;
 406         }
 407       while (isxdigit (*p));
 408     }
 409   else
 410     {
 411       do
 412         {
 413           p++;
 414         }
 415       while (isdigit (*p));
 416     }
 417   size = p - *str;
 418   tmp = alloc (size + 1);
 419   strncpy (tmp, *str, size);
 420   tmp[size] = 0;
 421   *val = tmp;
 422   *str = p;
 423 }
 424
 425 static const token symbols[] =
 426 {
 427   {TOK_CONST, "const"},
 428   {TOK_UNION, "union"},
 429   {TOK_SWITCH, "switch"},
 430   {TOK_CASE, "case"},
 431   {TOK_DEFAULT, "default"},
 432   {TOK_STRUCT, "struct"},
 433   {TOK_TYPEDEF, "typedef"},
 434   {TOK_ENUM, "enum"},
 435   {TOK_OPAQUE, "opaque"},
 436   {TOK_BOOL, "bool"},
 437   {TOK_VOID, "void"},
 438   {TOK_CHAR, "char"},
 439   {TOK_INT, "int"},
 440   {TOK_UNSIGNED, "unsigned"},
 441   {TOK_SHORT, "short"},
 442   {TOK_LONG, "long"},
 443   {TOK_FLOAT, "float"},
 444   {TOK_DOUBLE, "double"},
 445   {TOK_STRING, "string"},
 446   {TOK_PROGRAM, "program"},
 447   {TOK_VERSION, "version"},
 448   {TOK_EOF, "??????"},
 449 };
 450
 451 static void
 452 findkind (const char **mark, token *tokp)
 453 {
 454   int len;
 455   const token *s;
 456   const char *str;
 457   char *tmp;
 458
 459   str = *mark;
 460   for (s = symbols; s->kind != TOK_EOF; s++)
 461     {
 462       len = strlen (s->str);
 463       if (strncmp (str, s->str, len) == 0)
 464         {
 465           if (!isalnum (str[len]) && str[len] != '_')
 466             {
 467               tokp->kind = s->kind;
 468               tokp->str = s->str;
 469               *mark = str + len;
 470               return;
 471             }
 472         }
 473     }
 474   tokp->kind = TOK_IDENT;
 475   for (len = 0; isalnum (str[len]) || str[len] == '_'; len++);
 476   tmp = alloc (len + 1);
 477   strncpy (tmp, str, len);
 478   tmp[len] = 0;
 479   tokp->str = tmp;
 480   *mark = str + len;
 481 }
 482
 483 static int
 484 cppline (const char *line)
 485 {
 486   return line == curline && *line == '#';
 487 }
 488
 489 static int
 490 directive (const char *line)
 491 {
 492   return line == curline && *line == '%';
 493 }
 494
 495 static void
 496 printdirective (const char *line)
 497 {
 498   f_print (fout, "%s", line + 1);
 499 }
 500
 501 static void
 502 docppline (const char *line, int *lineno, const char **fname)
 503 {
 504   char *file;
 505   int num;
 506   char *p;
 507
 508   line++;
 509   while (isspace (*line))
 510     {
 511       line++;
 512     }
 513   num = atoi (line);
 514   while (isdigit (*line))
 515     {
 516       line++;
 517     }
 518   while (isspace (*line))
 519     {
 520       line++;
 521     }
 522   if (*line != '"')
 523     {
 524       error (_("preprocessor error"));
 525     }
 526   line++;
 527   p = file = alloc (strlen (line) + 1);
 528   while (*line && *line != '"')
 529     {
 530       *p++ = *line++;
 531     }
 532   if (*line == 0)
 533     {
 534       error (_("preprocessor error"));
 535     }
 536   *p = 0;
 537   if (*file == 0)
 538     {
 539       *fname = NULL;
 540     }
 541   else
 542     {
 543       *fname = file;
 544     }
 545   *lineno = num - 1;
 546 }