1 /* $OpenBSD: rpc_scan.c,v 1.7 2001/12/05 09:50:31 deraadt Exp $ */ 2 /* $NetBSD: rpc_scan.c,v 1.4 1995/06/11 21:50:02 pk Exp $ */ 3 /* 4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 5 * unrestricted use provided that this legend is included on all tape 6 * media and as a part of the software program in whole or part. Users 7 * may copy or modify Sun RPC without charge, but are not authorized 8 * to license or distribute it to anyone else except as part of a product or 9 * program developed by the user or with the express written consent of 10 * Sun Microsystems, Inc. 11 * 12 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 13 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 14 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 15 * 16 * Sun RPC is provided with no support and without any obligation on the 17 * part of Sun Microsystems, Inc. to assist in its use, correction, 18 * modification or enhancement. 19 * 20 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 21 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 22 * OR ANY PART THEREOF. 23 * 24 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 25 * or profits or other special, indirect and consequential damages, even if 26 * Sun has been advised of the possibility of such damages. 27 * 28 * Sun Microsystems, Inc. 29 * 2550 Garcia Avenue 30 * Mountain View, California 94043 31 */ 32 33 #ifndef lint 34 static char sccsid[] = "@(#)rpc_scan.c 1.11 89/02/22 (C) 1987 SMI"; 35 #endif 36 37 /* 38 * rpc_scan.c, Scanner for the RPC protocol compiler 39 * Copyright (C) 1987, Sun Microsystems, Inc. 40 */ 41 #include <sys/cdefs.h> 42 #include <stdlib.h> 43 #include <stdio.h> 44 #include <ctype.h> 45 #include <string.h> 46 #include "rpc_scan.h" 47 #include "rpc_parse.h" 48 #include "rpc_util.h" 49 50 static unget_token __P((token *tokp)); 51 static findstrconst __P((char **, char **)); 52 static findchrconst __P((char **, char **)); 53 static findconst __P((char **, char **)); 54 static findkind __P((char **, token *)); 55 static cppline __P((char *)); 56 static directive __P((char *)); 57 static printdirective __P((char *)); 58 static docppline __P((char *, int *, char **)); 59 60 #define startcomment(where) (where[0] == '/' && where[1] == '*') 61 #define endcomment(where) (where[-1] == '*' && where[0] == '/') 62 63 static int pushed = 0; /* is a token pushed */ 64 static token lasttok; /* last token, if pushed */ 65 66 /* 67 * scan expecting 1 given token 68 */ 69 void 70 scan(expect, tokp) 71 tok_kind expect; 72 token *tokp; 73 { 74 get_token(tokp); 75 if (tokp->kind != expect) 76 expected1(expect); 77 } 78 79 /* 80 * scan expecting any of the 2 given tokens 81 */ 82 void 83 scan2(expect1, expect2, tokp) 84 tok_kind expect1; 85 tok_kind expect2; 86 token *tokp; 87 { 88 get_token(tokp); 89 if (tokp->kind != expect1 && tokp->kind != expect2) 90 expected2(expect1, expect2); 91 } 92 93 /* 94 * scan expecting any of the 3 given token 95 */ 96 void 97 scan3(expect1, expect2, expect3, tokp) 98 tok_kind expect1; 99 tok_kind expect2; 100 tok_kind expect3; 101 token *tokp; 102 { 103 get_token(tokp); 104 if (tokp->kind != expect1 && tokp->kind != expect2 && 105 tokp->kind != expect3) 106 expected3(expect1, expect2, expect3); 107 } 108 109 /* 110 * scan expecting a constant, possibly symbolic 111 */ 112 void 113 scan_num(tokp) 114 token *tokp; 115 { 116 get_token(tokp); 117 switch (tokp->kind) { 118 case TOK_IDENT: 119 break; 120 default: 121 error("constant or identifier expected"); 122 } 123 } 124 125 /* 126 * Peek at the next token 127 */ 128 void 129 peek(tokp) 130 token *tokp; 131 { 132 get_token(tokp); 133 unget_token(tokp); 134 } 135 136 /* 137 * Peek at the next token and scan it if it matches what you expect 138 */ 139 int 140 peekscan(expect, tokp) 141 tok_kind expect; 142 token *tokp; 143 { 144 peek(tokp); 145 if (tokp->kind == expect) { 146 get_token(tokp); 147 return (1); 148 } 149 return (0); 150 } 151 152 /* 153 * Get the next token, printing out any directive that are encountered. 154 */ 155 void 156 get_token(tokp) 157 token *tokp; 158 { 159 int commenting; 160 161 if (pushed) { 162 pushed = 0; 163 *tokp = lasttok; 164 return; 165 } 166 commenting = 0; 167 for (;;) { 168 if (*where == 0) { 169 for (;;) { 170 if (!fgets(curline, MAXLINESIZE, fin)) { 171 tokp->kind = TOK_EOF; 172 *where = 0; 173 return; 174 } 175 linenum++; 176 if (commenting) { 177 break; 178 } else if (cppline(curline)) { 179 docppline(curline, &linenum, 180 &infilename); 181 } else if (directive(curline)) { 182 printdirective(curline); 183 } else { 184 break; 185 } 186 } 187 where = curline; 188 } else if (isspace(*where)) { 189 while (isspace(*where)) { 190 where++; /* eat */ 191 } 192 } else if (commenting) { 193 for (where++; *where; where++) { 194 if (endcomment(where)) { 195 where++; 196 commenting--; 197 break; 198 } 199 } 200 } else if (startcomment(where)) { 201 where += 2; 202 commenting++; 203 } else { 204 break; 205 } 206 } 207 208 /* 209 * 'where' is not whitespace, comment or directive Must be a token! 210 */ 211 switch (*where) { 212 case ':': 213 tokp->kind = TOK_COLON; 214 where++; 215 break; 216 case ';': 217 tokp->kind = TOK_SEMICOLON; 218 where++; 219 break; 220 case ',': 221 tokp->kind = TOK_COMMA; 222 where++; 223 break; 224 case '=': 225 tokp->kind = TOK_EQUAL; 226 where++; 227 break; 228 case '*': 229 tokp->kind = TOK_STAR; 230 where++; 231 break; 232 case '[': 233 tokp->kind = TOK_LBRACKET; 234 where++; 235 break; 236 case ']': 237 tokp->kind = TOK_RBRACKET; 238 where++; 239 break; 240 case '{': 241 tokp->kind = TOK_LBRACE; 242 where++; 243 break; 244 case '}': 245 tokp->kind = TOK_RBRACE; 246 where++; 247 break; 248 case '(': 249 tokp->kind = TOK_LPAREN; 250 where++; 251 break; 252 case ')': 253 tokp->kind = TOK_RPAREN; 254 where++; 255 break; 256 case '<': 257 tokp->kind = TOK_LANGLE; 258 where++; 259 break; 260 case '>': 261 tokp->kind = TOK_RANGLE; 262 where++; 263 break; 264 265 case '"': 266 tokp->kind = TOK_STRCONST; 267 findstrconst(&where, &tokp->str); 268 break; 269 case '\'': 270 tokp->kind = TOK_CHARCONST; 271 findchrconst(&where, &tokp->str); 272 break; 273 274 case '-': 275 case '0': 276 case '1': 277 case '2': 278 case '3': 279 case '4': 280 case '5': 281 case '6': 282 case '7': 283 case '8': 284 case '9': 285 tokp->kind = TOK_IDENT; 286 findconst(&where, &tokp->str); 287 break; 288 289 default: 290 if (!(isalpha(*where) || *where == '_')) { 291 char buf[100]; 292 char *p; 293 294 s_print(buf, "illegal character in file: "); 295 p = buf + strlen(buf); 296 if (isprint(*where)) { 297 s_print(p, "%c", *where); 298 } else { 299 s_print(p, "%d", *where); 300 } 301 error(buf); 302 } 303 findkind(&where, tokp); 304 break; 305 } 306 } 307 308 static 309 unget_token(tokp) 310 token *tokp; 311 { 312 lasttok = *tokp; 313 pushed = 1; 314 } 315 316 static 317 findstrconst(str, val) 318 char **str; 319 char **val; 320 { 321 char *p; 322 int size; 323 324 p = *str; 325 do { 326 *p++; 327 } while (*p && *p != '"'); 328 if (*p == 0) { 329 error("unterminated string constant"); 330 } 331 p++; 332 size = p - *str; 333 *val = alloc(size + 1); 334 (void) strncpy(*val, *str, size); 335 (*val)[size] = 0; 336 *str = p; 337 } 338 339 static 340 findchrconst(str, val) 341 char **str; 342 char **val; 343 { 344 char *p; 345 int size; 346 347 p = *str; 348 do { 349 *p++; 350 } while (*p && *p != '\''); 351 if (*p == 0) { 352 error("unterminated string constant"); 353 } 354 p++; 355 size = p - *str; 356 if (size != 3) { 357 error("empty char string"); 358 } 359 *val = alloc(size + 1); 360 (void) strncpy(*val, *str, size); 361 (*val)[size] = 0; 362 *str = p; 363 } 364 365 static 366 findconst(str, val) 367 char **str; 368 char **val; 369 { 370 char *p; 371 int size; 372 373 p = *str; 374 if (*p == '0' && *(p + 1) == 'x') { 375 p++; 376 do { 377 p++; 378 } while (isxdigit(*p)); 379 } else { 380 do { 381 p++; 382 } while (isdigit(*p)); 383 } 384 size = p - *str; 385 *val = alloc(size + 1); 386 (void) strncpy(*val, *str, size); 387 (*val)[size] = 0; 388 *str = p; 389 } 390 391 static token symbols[] = { 392 {TOK_CONST, "const"}, 393 {TOK_UNION, "union"}, 394 {TOK_SWITCH, "switch"}, 395 {TOK_CASE, "case"}, 396 {TOK_DEFAULT, "default"}, 397 {TOK_STRUCT, "struct"}, 398 {TOK_TYPEDEF, "typedef"}, 399 {TOK_ENUM, "enum"}, 400 {TOK_OPAQUE, "opaque"}, 401 {TOK_BOOL, "bool"}, 402 {TOK_VOID, "void"}, 403 {TOK_CHAR, "char"}, 404 {TOK_INT, "int"}, 405 {TOK_UNSIGNED, "unsigned"}, 406 {TOK_SHORT, "short"}, 407 {TOK_LONG, "long"}, 408 {TOK_FLOAT, "float"}, 409 {TOK_DOUBLE, "double"}, 410 {TOK_STRING, "string"}, 411 {TOK_PROGRAM, "program"}, 412 {TOK_VERSION, "version"}, 413 {TOK_EOF, "??????"}, 414 }; 415 416 static 417 findkind(mark, tokp) 418 char **mark; 419 token *tokp; 420 { 421 int len; 422 token *s; 423 char *str; 424 425 str = *mark; 426 for (s = symbols; s->kind != TOK_EOF; s++) { 427 len = strlen(s->str); 428 if (strncmp(str, s->str, len) == 0) { 429 if (!isalnum(str[len]) && str[len] != '_') { 430 tokp->kind = s->kind; 431 tokp->str = s->str; 432 *mark = str + len; 433 return; 434 } 435 } 436 } 437 tokp->kind = TOK_IDENT; 438 for (len = 0; isalnum(str[len]) || str[len] == '_'; len++); 439 tokp->str = alloc(len + 1); 440 (void) strncpy(tokp->str, str, len); 441 tokp->str[len] = 0; 442 *mark = str + len; 443 } 444 445 static 446 cppline(line) 447 char *line; 448 { 449 return (line == curline && *line == '#'); 450 } 451 452 static 453 directive(line) 454 char *line; 455 { 456 return (line == curline && *line == '%'); 457 } 458 459 static 460 printdirective(line) 461 char *line; 462 { 463 f_print(fout, "%s", line + 1); 464 } 465 466 static 467 docppline(line, lineno, fname) 468 char *line; 469 int *lineno; 470 char **fname; 471 { 472 char *file; 473 int num; 474 char *p; 475 476 line++; 477 while (isspace(*line)) { 478 line++; 479 } 480 num = atoi(line); 481 while (isdigit(*line)) { 482 line++; 483 } 484 while (isspace(*line)) { 485 line++; 486 } 487 if (*line != '"') { 488 error("preprocessor error"); 489 } 490 line++; 491 p = file = alloc(strlen(line) + 1); 492 while (*line && *line != '"') { 493 *p++ = *line++; 494 } 495 if (*line == 0) { 496 error("preprocessor error"); 497 } 498 *p = 0; 499 if (*file == 0) { 500 *fname = NULL; 501 } else { 502 *fname = file; 503 } 504 *lineno = num - 1; 505 } 506