1 /* $NetBSD: cond.c,v 1.68 2015/05/05 21:51:09 sjg Exp $ */ 2 3 /* 4 * Copyright (c) 1988, 1989, 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Adam de Boor. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 /* 36 * Copyright (c) 1988, 1989 by Adam de Boor 37 * Copyright (c) 1989 by Berkeley Softworks 38 * All rights reserved. 39 * 40 * This code is derived from software contributed to Berkeley by 41 * Adam de Boor. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by the University of 54 * California, Berkeley and its contributors. 55 * 4. Neither the name of the University nor the names of its contributors 56 * may be used to endorse or promote products derived from this software 57 * without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 */ 71 72 #ifndef MAKE_NATIVE 73 static char rcsid[] = "$NetBSD: cond.c,v 1.68 2015/05/05 21:51:09 sjg Exp $"; 74 #else 75 #include <sys/cdefs.h> 76 #ifndef lint 77 #if 0 78 static char sccsid[] = "@(#)cond.c 8.2 (Berkeley) 1/2/94"; 79 #else 80 __RCSID("$NetBSD: cond.c,v 1.68 2015/05/05 21:51:09 sjg Exp $"); 81 #endif 82 #endif /* not lint */ 83 #endif 84 85 /*- 86 * cond.c -- 87 * Functions to handle conditionals in a makefile. 88 * 89 * Interface: 90 * Cond_Eval Evaluate the conditional in the passed line. 91 * 92 */ 93 94 #include <ctype.h> 95 #include <errno.h> /* For strtoul() error checking */ 96 97 #include "make.h" 98 #include "hash.h" 99 #include "dir.h" 100 #include "buf.h" 101 102 /* 103 * The parsing of conditional expressions is based on this grammar: 104 * E -> F || E 105 * E -> F 106 * F -> T && F 107 * F -> T 108 * T -> defined(variable) 109 * T -> make(target) 110 * T -> exists(file) 111 * T -> empty(varspec) 112 * T -> target(name) 113 * T -> commands(name) 114 * T -> symbol 115 * T -> $(varspec) op value 116 * T -> $(varspec) == "string" 117 * T -> $(varspec) != "string" 118 * T -> "string" 119 * T -> ( E ) 120 * T -> ! T 121 * op -> == | != | > | < | >= | <= 122 * 123 * 'symbol' is some other symbol to which the default function (condDefProc) 124 * is applied. 125 * 126 * Tokens are scanned from the 'condExpr' string. The scanner (CondToken) 127 * will return TOK_AND for '&' and '&&', TOK_OR for '|' and '||', 128 * TOK_NOT for '!', TOK_LPAREN for '(', TOK_RPAREN for ')' and will evaluate 129 * the other terminal symbols, using either the default function or the 130 * function given in the terminal, and return the result as either TOK_TRUE 131 * or TOK_FALSE. 132 * 133 * TOK_FALSE is 0 and TOK_TRUE 1 so we can directly assign C comparisons. 134 * 135 * All Non-Terminal functions (CondE, CondF and CondT) return TOK_ERROR on 136 * error. 137 */ 138 typedef enum { 139 TOK_FALSE = 0, TOK_TRUE = 1, TOK_AND, TOK_OR, TOK_NOT, 140 TOK_LPAREN, TOK_RPAREN, TOK_EOF, TOK_NONE, TOK_ERROR 141 } Token; 142 143 /*- 144 * Structures to handle elegantly the different forms of #if's. The 145 * last two fields are stored in condInvert and condDefProc, respectively. 146 */ 147 static void CondPushBack(Token); 148 static int CondGetArg(char **, char **, const char *); 149 static Boolean CondDoDefined(int, const char *); 150 static int CondStrMatch(const void *, const void *); 151 static Boolean CondDoMake(int, const char *); 152 static Boolean CondDoExists(int, const char *); 153 static Boolean CondDoTarget(int, const char *); 154 static Boolean CondDoCommands(int, const char *); 155 static Boolean CondCvtArg(char *, double *); 156 static Token CondToken(Boolean); 157 static Token CondT(Boolean); 158 static Token CondF(Boolean); 159 static Token CondE(Boolean); 160 static int do_Cond_EvalExpression(Boolean *); 161 162 static const struct If { 163 const char *form; /* Form of if */ 164 int formlen; /* Length of form */ 165 Boolean doNot; /* TRUE if default function should be negated */ 166 Boolean (*defProc)(int, const char *); /* Default function to apply */ 167 } ifs[] = { 168 { "def", 3, FALSE, CondDoDefined }, 169 { "ndef", 4, TRUE, CondDoDefined }, 170 { "make", 4, FALSE, CondDoMake }, 171 { "nmake", 5, TRUE, CondDoMake }, 172 { "", 0, FALSE, CondDoDefined }, 173 { NULL, 0, FALSE, NULL } 174 }; 175 176 static const struct If *if_info; /* Info for current statement */ 177 static char *condExpr; /* The expression to parse */ 178 static Token condPushBack=TOK_NONE; /* Single push-back token used in 179 * parsing */ 180 181 static unsigned int cond_depth = 0; /* current .if nesting level */ 182 static unsigned int cond_min_depth = 0; /* depth at makefile open */ 183 184 /* 185 * Indicate when we should be strict about lhs of comparisons. 186 * TRUE when Cond_EvalExpression is called from Cond_Eval (.if etc) 187 * FALSE when Cond_EvalExpression is called from var.c:ApplyModifiers 188 * since lhs is already expanded and we cannot tell if 189 * it was a variable reference or not. 190 */ 191 static Boolean lhsStrict; 192 193 static int 194 istoken(const char *str, const char *tok, size_t len) 195 { 196 return strncmp(str, tok, len) == 0 && !isalpha((unsigned char)str[len]); 197 } 198 199 /*- 200 *----------------------------------------------------------------------- 201 * CondPushBack -- 202 * Push back the most recent token read. We only need one level of 203 * this, so the thing is just stored in 'condPushback'. 204 * 205 * Input: 206 * t Token to push back into the "stream" 207 * 208 * Results: 209 * None. 210 * 211 * Side Effects: 212 * condPushback is overwritten. 213 * 214 *----------------------------------------------------------------------- 215 */ 216 static void 217 CondPushBack(Token t) 218 { 219 condPushBack = t; 220 } 221 222 /*- 223 *----------------------------------------------------------------------- 224 * CondGetArg -- 225 * Find the argument of a built-in function. 226 * 227 * Input: 228 * parens TRUE if arg should be bounded by parens 229 * 230 * Results: 231 * The length of the argument and the address of the argument. 232 * 233 * Side Effects: 234 * The pointer is set to point to the closing parenthesis of the 235 * function call. 236 * 237 *----------------------------------------------------------------------- 238 */ 239 static int 240 CondGetArg(char **linePtr, char **argPtr, const char *func) 241 { 242 char *cp; 243 int argLen; 244 Buffer buf; 245 int paren_depth; 246 char ch; 247 248 cp = *linePtr; 249 if (func != NULL) 250 /* Skip opening '(' - verfied by caller */ 251 cp++; 252 253 if (*cp == '\0') { 254 /* 255 * No arguments whatsoever. Because 'make' and 'defined' aren't really 256 * "reserved words", we don't print a message. I think this is better 257 * than hitting the user with a warning message every time s/he uses 258 * the word 'make' or 'defined' at the beginning of a symbol... 259 */ 260 *argPtr = NULL; 261 return (0); 262 } 263 264 while (*cp == ' ' || *cp == '\t') { 265 cp++; 266 } 267 268 /* 269 * Create a buffer for the argument and start it out at 16 characters 270 * long. Why 16? Why not? 271 */ 272 Buf_Init(&buf, 16); 273 274 paren_depth = 0; 275 for (;;) { 276 ch = *cp; 277 if (ch == 0 || ch == ' ' || ch == '\t') 278 break; 279 if ((ch == '&' || ch == '|') && paren_depth == 0) 280 break; 281 if (*cp == '$') { 282 /* 283 * Parse the variable spec and install it as part of the argument 284 * if it's valid. We tell Var_Parse to complain on an undefined 285 * variable, so we don't do it too. Nor do we return an error, 286 * though perhaps we should... 287 */ 288 char *cp2; 289 int len; 290 void *freeIt; 291 292 cp2 = Var_Parse(cp, VAR_CMD, TRUE, &len, &freeIt); 293 Buf_AddBytes(&buf, strlen(cp2), cp2); 294 if (freeIt) 295 free(freeIt); 296 cp += len; 297 continue; 298 } 299 if (ch == '(') 300 paren_depth++; 301 else 302 if (ch == ')' && --paren_depth < 0) 303 break; 304 Buf_AddByte(&buf, *cp); 305 cp++; 306 } 307 308 *argPtr = Buf_GetAll(&buf, &argLen); 309 Buf_Destroy(&buf, FALSE); 310 311 while (*cp == ' ' || *cp == '\t') { 312 cp++; 313 } 314 315 if (func != NULL && *cp++ != ')') { 316 Parse_Error(PARSE_WARNING, "Missing closing parenthesis for %s()", 317 func); 318 return (0); 319 } 320 321 *linePtr = cp; 322 return (argLen); 323 } 324 325 /*- 326 *----------------------------------------------------------------------- 327 * CondDoDefined -- 328 * Handle the 'defined' function for conditionals. 329 * 330 * Results: 331 * TRUE if the given variable is defined. 332 * 333 * Side Effects: 334 * None. 335 * 336 *----------------------------------------------------------------------- 337 */ 338 static Boolean 339 CondDoDefined(int argLen MAKE_ATTR_UNUSED, const char *arg) 340 { 341 char *p1; 342 Boolean result; 343 344 if (Var_Value(arg, VAR_CMD, &p1) != NULL) { 345 result = TRUE; 346 } else { 347 result = FALSE; 348 } 349 if (p1) 350 free(p1); 351 return (result); 352 } 353 354 /*- 355 *----------------------------------------------------------------------- 356 * CondStrMatch -- 357 * Front-end for Str_Match so it returns 0 on match and non-zero 358 * on mismatch. Callback function for CondDoMake via Lst_Find 359 * 360 * Results: 361 * 0 if string matches pattern 362 * 363 * Side Effects: 364 * None 365 * 366 *----------------------------------------------------------------------- 367 */ 368 static int 369 CondStrMatch(const void *string, const void *pattern) 370 { 371 return(!Str_Match(string, pattern)); 372 } 373 374 /*- 375 *----------------------------------------------------------------------- 376 * CondDoMake -- 377 * Handle the 'make' function for conditionals. 378 * 379 * Results: 380 * TRUE if the given target is being made. 381 * 382 * Side Effects: 383 * None. 384 * 385 *----------------------------------------------------------------------- 386 */ 387 static Boolean 388 CondDoMake(int argLen MAKE_ATTR_UNUSED, const char *arg) 389 { 390 return Lst_Find(create, arg, CondStrMatch) != NULL; 391 } 392 393 /*- 394 *----------------------------------------------------------------------- 395 * CondDoExists -- 396 * See if the given file exists. 397 * 398 * Results: 399 * TRUE if the file exists and FALSE if it does not. 400 * 401 * Side Effects: 402 * None. 403 * 404 *----------------------------------------------------------------------- 405 */ 406 static Boolean 407 CondDoExists(int argLen MAKE_ATTR_UNUSED, const char *arg) 408 { 409 Boolean result; 410 char *path; 411 412 path = Dir_FindFile(arg, dirSearchPath); 413 if (DEBUG(COND)) { 414 fprintf(debug_file, "exists(%s) result is \"%s\"\n", 415 arg, path ? path : ""); 416 } 417 if (path != NULL) { 418 result = TRUE; 419 free(path); 420 } else { 421 result = FALSE; 422 } 423 return (result); 424 } 425 426 /*- 427 *----------------------------------------------------------------------- 428 * CondDoTarget -- 429 * See if the given node exists and is an actual target. 430 * 431 * Results: 432 * TRUE if the node exists as a target and FALSE if it does not. 433 * 434 * Side Effects: 435 * None. 436 * 437 *----------------------------------------------------------------------- 438 */ 439 static Boolean 440 CondDoTarget(int argLen MAKE_ATTR_UNUSED, const char *arg) 441 { 442 GNode *gn; 443 444 gn = Targ_FindNode(arg, TARG_NOCREATE); 445 return (gn != NULL) && !OP_NOP(gn->type); 446 } 447 448 /*- 449 *----------------------------------------------------------------------- 450 * CondDoCommands -- 451 * See if the given node exists and is an actual target with commands 452 * associated with it. 453 * 454 * Results: 455 * TRUE if the node exists as a target and has commands associated with 456 * it and FALSE if it does not. 457 * 458 * Side Effects: 459 * None. 460 * 461 *----------------------------------------------------------------------- 462 */ 463 static Boolean 464 CondDoCommands(int argLen MAKE_ATTR_UNUSED, const char *arg) 465 { 466 GNode *gn; 467 468 gn = Targ_FindNode(arg, TARG_NOCREATE); 469 return (gn != NULL) && !OP_NOP(gn->type) && !Lst_IsEmpty(gn->commands); 470 } 471 472 /*- 473 *----------------------------------------------------------------------- 474 * CondCvtArg -- 475 * Convert the given number into a double. 476 * We try a base 10 or 16 integer conversion first, if that fails 477 * then we try a floating point conversion instead. 478 * 479 * Results: 480 * Sets 'value' to double value of string. 481 * Returns 'true' if the convertion suceeded 482 * 483 *----------------------------------------------------------------------- 484 */ 485 static Boolean 486 CondCvtArg(char *str, double *value) 487 { 488 char *eptr, ech; 489 unsigned long l_val; 490 double d_val; 491 492 errno = 0; 493 l_val = strtoul(str, &eptr, str[1] == 'x' ? 16 : 10); 494 ech = *eptr; 495 if (ech == 0 && errno != ERANGE) { 496 d_val = str[0] == '-' ? -(double)-l_val : (double)l_val; 497 } else { 498 if (ech != 0 && ech != '.' && ech != 'e' && ech != 'E') 499 return FALSE; 500 d_val = strtod(str, &eptr); 501 if (*eptr) 502 return FALSE; 503 } 504 505 *value = d_val; 506 return TRUE; 507 } 508 509 /*- 510 *----------------------------------------------------------------------- 511 * CondGetString -- 512 * Get a string from a variable reference or an optionally quoted 513 * string. This is called for the lhs and rhs of string compares. 514 * 515 * Results: 516 * Sets freeIt if needed, 517 * Sets quoted if string was quoted, 518 * Returns NULL on error, 519 * else returns string - absent any quotes. 520 * 521 * Side Effects: 522 * Moves condExpr to end of this token. 523 * 524 * 525 *----------------------------------------------------------------------- 526 */ 527 /* coverity:[+alloc : arg-*2] */ 528 static char * 529 CondGetString(Boolean doEval, Boolean *quoted, void **freeIt, Boolean strictLHS) 530 { 531 Buffer buf; 532 char *cp; 533 char *str; 534 int len; 535 int qt; 536 char *start; 537 538 Buf_Init(&buf, 0); 539 str = NULL; 540 *freeIt = NULL; 541 *quoted = qt = *condExpr == '"' ? 1 : 0; 542 if (qt) 543 condExpr++; 544 for (start = condExpr; *condExpr && str == NULL; condExpr++) { 545 switch (*condExpr) { 546 case '\\': 547 if (condExpr[1] != '\0') { 548 condExpr++; 549 Buf_AddByte(&buf, *condExpr); 550 } 551 break; 552 case '"': 553 if (qt) { 554 condExpr++; /* we don't want the quotes */ 555 goto got_str; 556 } else 557 Buf_AddByte(&buf, *condExpr); /* likely? */ 558 break; 559 case ')': 560 case '!': 561 case '=': 562 case '>': 563 case '<': 564 case ' ': 565 case '\t': 566 if (!qt) 567 goto got_str; 568 else 569 Buf_AddByte(&buf, *condExpr); 570 break; 571 case '$': 572 /* if we are in quotes, then an undefined variable is ok */ 573 str = Var_Parse(condExpr, VAR_CMD, (qt ? 0 : doEval), 574 &len, freeIt); 575 if (str == var_Error) { 576 if (*freeIt) { 577 free(*freeIt); 578 *freeIt = NULL; 579 } 580 /* 581 * Even if !doEval, we still report syntax errors, which 582 * is what getting var_Error back with !doEval means. 583 */ 584 str = NULL; 585 goto cleanup; 586 } 587 condExpr += len; 588 /* 589 * If the '$' was first char (no quotes), and we are 590 * followed by space, the operator or end of expression, 591 * we are done. 592 */ 593 if ((condExpr == start + len) && 594 (*condExpr == '\0' || 595 isspace((unsigned char) *condExpr) || 596 strchr("!=><)", *condExpr))) { 597 goto cleanup; 598 } 599 /* 600 * Nope, we better copy str to buf 601 */ 602 for (cp = str; *cp; cp++) { 603 Buf_AddByte(&buf, *cp); 604 } 605 if (*freeIt) { 606 free(*freeIt); 607 *freeIt = NULL; 608 } 609 str = NULL; /* not finished yet */ 610 condExpr--; /* don't skip over next char */ 611 break; 612 default: 613 if (strictLHS && !qt && *start != '$' && 614 !isdigit((unsigned char) *start)) { 615 /* lhs must be quoted, a variable reference or number */ 616 if (*freeIt) { 617 free(*freeIt); 618 *freeIt = NULL; 619 } 620 str = NULL; 621 goto cleanup; 622 } 623 Buf_AddByte(&buf, *condExpr); 624 break; 625 } 626 } 627 got_str: 628 str = Buf_GetAll(&buf, NULL); 629 *freeIt = str; 630 cleanup: 631 Buf_Destroy(&buf, FALSE); 632 return str; 633 } 634 635 /*- 636 *----------------------------------------------------------------------- 637 * CondToken -- 638 * Return the next token from the input. 639 * 640 * Results: 641 * A Token for the next lexical token in the stream. 642 * 643 * Side Effects: 644 * condPushback will be set back to TOK_NONE if it is used. 645 * 646 *----------------------------------------------------------------------- 647 */ 648 static Token 649 compare_expression(Boolean doEval) 650 { 651 Token t; 652 char *lhs; 653 char *rhs; 654 char *op; 655 void *lhsFree; 656 void *rhsFree; 657 Boolean lhsQuoted; 658 Boolean rhsQuoted; 659 double left, right; 660 661 t = TOK_ERROR; 662 rhs = NULL; 663 lhsFree = rhsFree = FALSE; 664 lhsQuoted = rhsQuoted = FALSE; 665 666 /* 667 * Parse the variable spec and skip over it, saving its 668 * value in lhs. 669 */ 670 lhs = CondGetString(doEval, &lhsQuoted, &lhsFree, lhsStrict); 671 if (!lhs) 672 goto done; 673 674 /* 675 * Skip whitespace to get to the operator 676 */ 677 while (isspace((unsigned char) *condExpr)) 678 condExpr++; 679 680 /* 681 * Make sure the operator is a valid one. If it isn't a 682 * known relational operator, pretend we got a 683 * != 0 comparison. 684 */ 685 op = condExpr; 686 switch (*condExpr) { 687 case '!': 688 case '=': 689 case '<': 690 case '>': 691 if (condExpr[1] == '=') { 692 condExpr += 2; 693 } else { 694 condExpr += 1; 695 } 696 break; 697 default: 698 if (!doEval) { 699 t = TOK_FALSE; 700 goto done; 701 } 702 /* For .ifxxx "..." check for non-empty string. */ 703 if (lhsQuoted) { 704 t = lhs[0] != 0; 705 goto done; 706 } 707 /* For .ifxxx <number> compare against zero */ 708 if (CondCvtArg(lhs, &left)) { 709 t = left != 0.0; 710 goto done; 711 } 712 /* For .if ${...} check for non-empty string (defProc is ifdef). */ 713 if (if_info->form[0] == 0) { 714 t = lhs[0] != 0; 715 goto done; 716 } 717 /* Otherwise action default test ... */ 718 t = if_info->defProc(strlen(lhs), lhs) != if_info->doNot; 719 goto done; 720 } 721 722 while (isspace((unsigned char)*condExpr)) 723 condExpr++; 724 725 if (*condExpr == '\0') { 726 Parse_Error(PARSE_WARNING, 727 "Missing right-hand-side of operator"); 728 goto done; 729 } 730 731 rhs = CondGetString(doEval, &rhsQuoted, &rhsFree, FALSE); 732 if (!rhs) 733 goto done; 734 735 if (rhsQuoted || lhsQuoted) { 736 do_string_compare: 737 if (((*op != '!') && (*op != '=')) || (op[1] != '=')) { 738 Parse_Error(PARSE_WARNING, 739 "String comparison operator should be either == or !="); 740 goto done; 741 } 742 743 if (DEBUG(COND)) { 744 fprintf(debug_file, "lhs = \"%s\", rhs = \"%s\", op = %.2s\n", 745 lhs, rhs, op); 746 } 747 /* 748 * Null-terminate rhs and perform the comparison. 749 * t is set to the result. 750 */ 751 if (*op == '=') { 752 t = strcmp(lhs, rhs) == 0; 753 } else { 754 t = strcmp(lhs, rhs) != 0; 755 } 756 } else { 757 /* 758 * rhs is either a float or an integer. Convert both the 759 * lhs and the rhs to a double and compare the two. 760 */ 761 762 if (!CondCvtArg(lhs, &left) || !CondCvtArg(rhs, &right)) 763 goto do_string_compare; 764 765 if (DEBUG(COND)) { 766 fprintf(debug_file, "left = %f, right = %f, op = %.2s\n", left, 767 right, op); 768 } 769 switch(op[0]) { 770 case '!': 771 if (op[1] != '=') { 772 Parse_Error(PARSE_WARNING, 773 "Unknown operator"); 774 goto done; 775 } 776 t = (left != right); 777 break; 778 case '=': 779 if (op[1] != '=') { 780 Parse_Error(PARSE_WARNING, 781 "Unknown operator"); 782 goto done; 783 } 784 t = (left == right); 785 break; 786 case '<': 787 if (op[1] == '=') { 788 t = (left <= right); 789 } else { 790 t = (left < right); 791 } 792 break; 793 case '>': 794 if (op[1] == '=') { 795 t = (left >= right); 796 } else { 797 t = (left > right); 798 } 799 break; 800 } 801 } 802 803 done: 804 if (lhsFree) 805 free(lhsFree); 806 if (rhsFree) 807 free(rhsFree); 808 return t; 809 } 810 811 static int 812 get_mpt_arg(char **linePtr, char **argPtr, const char *func MAKE_ATTR_UNUSED) 813 { 814 /* 815 * Use Var_Parse to parse the spec in parens and return 816 * TOK_TRUE if the resulting string is empty. 817 */ 818 int length; 819 void *freeIt; 820 char *val; 821 char *cp = *linePtr; 822 823 /* We do all the work here and return the result as the length */ 824 *argPtr = NULL; 825 826 val = Var_Parse(cp - 1, VAR_CMD, FALSE, &length, &freeIt); 827 /* 828 * Advance *linePtr to beyond the closing ). Note that 829 * we subtract one because 'length' is calculated from 'cp - 1'. 830 */ 831 *linePtr = cp - 1 + length; 832 833 if (val == var_Error) { 834 free(freeIt); 835 return -1; 836 } 837 838 /* A variable is empty when it just contains spaces... 4/15/92, christos */ 839 while (isspace(*(unsigned char *)val)) 840 val++; 841 842 /* 843 * For consistency with the other functions we can't generate the 844 * true/false here. 845 */ 846 length = *val ? 2 : 1; 847 if (freeIt) 848 free(freeIt); 849 return length; 850 } 851 852 static Boolean 853 CondDoEmpty(int arglen, const char *arg MAKE_ATTR_UNUSED) 854 { 855 return arglen == 1; 856 } 857 858 static Token 859 compare_function(Boolean doEval) 860 { 861 static const struct fn_def { 862 const char *fn_name; 863 int fn_name_len; 864 int (*fn_getarg)(char **, char **, const char *); 865 Boolean (*fn_proc)(int, const char *); 866 } fn_defs[] = { 867 { "defined", 7, CondGetArg, CondDoDefined }, 868 { "make", 4, CondGetArg, CondDoMake }, 869 { "exists", 6, CondGetArg, CondDoExists }, 870 { "empty", 5, get_mpt_arg, CondDoEmpty }, 871 { "target", 6, CondGetArg, CondDoTarget }, 872 { "commands", 8, CondGetArg, CondDoCommands }, 873 { NULL, 0, NULL, NULL }, 874 }; 875 const struct fn_def *fn_def; 876 Token t; 877 char *arg = NULL; 878 int arglen; 879 char *cp = condExpr; 880 char *cp1; 881 882 for (fn_def = fn_defs; fn_def->fn_name != NULL; fn_def++) { 883 if (!istoken(cp, fn_def->fn_name, fn_def->fn_name_len)) 884 continue; 885 cp += fn_def->fn_name_len; 886 /* There can only be whitespace before the '(' */ 887 while (isspace(*(unsigned char *)cp)) 888 cp++; 889 if (*cp != '(') 890 break; 891 892 arglen = fn_def->fn_getarg(&cp, &arg, fn_def->fn_name); 893 if (arglen <= 0) { 894 condExpr = cp; 895 return arglen < 0 ? TOK_ERROR : TOK_FALSE; 896 } 897 /* Evaluate the argument using the required function. */ 898 t = !doEval || fn_def->fn_proc(arglen, arg); 899 if (arg) 900 free(arg); 901 condExpr = cp; 902 return t; 903 } 904 905 /* Push anything numeric through the compare expression */ 906 cp = condExpr; 907 if (isdigit((unsigned char)cp[0]) || strchr("+-", cp[0])) 908 return compare_expression(doEval); 909 910 /* 911 * Most likely we have a naked token to apply the default function to. 912 * However ".if a == b" gets here when the "a" is unquoted and doesn't 913 * start with a '$'. This surprises people. 914 * If what follows the function argument is a '=' or '!' then the syntax 915 * would be invalid if we did "defined(a)" - so instead treat as an 916 * expression. 917 */ 918 arglen = CondGetArg(&cp, &arg, NULL); 919 for (cp1 = cp; isspace(*(unsigned char *)cp1); cp1++) 920 continue; 921 if (*cp1 == '=' || *cp1 == '!') 922 return compare_expression(doEval); 923 condExpr = cp; 924 925 /* 926 * Evaluate the argument using the default function. 927 * This path always treats .if as .ifdef. To get here the character 928 * after .if must have been taken literally, so the argument cannot 929 * be empty - even if it contained a variable expansion. 930 */ 931 t = !doEval || if_info->defProc(arglen, arg) != if_info->doNot; 932 if (arg) 933 free(arg); 934 return t; 935 } 936 937 static Token 938 CondToken(Boolean doEval) 939 { 940 Token t; 941 942 t = condPushBack; 943 if (t != TOK_NONE) { 944 condPushBack = TOK_NONE; 945 return t; 946 } 947 948 while (*condExpr == ' ' || *condExpr == '\t') { 949 condExpr++; 950 } 951 952 switch (*condExpr) { 953 954 case '(': 955 condExpr++; 956 return TOK_LPAREN; 957 958 case ')': 959 condExpr++; 960 return TOK_RPAREN; 961 962 case '|': 963 if (condExpr[1] == '|') { 964 condExpr++; 965 } 966 condExpr++; 967 return TOK_OR; 968 969 case '&': 970 if (condExpr[1] == '&') { 971 condExpr++; 972 } 973 condExpr++; 974 return TOK_AND; 975 976 case '!': 977 condExpr++; 978 return TOK_NOT; 979 980 case '#': 981 case '\n': 982 case '\0': 983 return TOK_EOF; 984 985 case '"': 986 case '$': 987 return compare_expression(doEval); 988 989 default: 990 return compare_function(doEval); 991 } 992 } 993 994 /*- 995 *----------------------------------------------------------------------- 996 * CondT -- 997 * Parse a single term in the expression. This consists of a terminal 998 * symbol or TOK_NOT and a terminal symbol (not including the binary 999 * operators): 1000 * T -> defined(variable) | make(target) | exists(file) | symbol 1001 * T -> ! T | ( E ) 1002 * 1003 * Results: 1004 * TOK_TRUE, TOK_FALSE or TOK_ERROR. 1005 * 1006 * Side Effects: 1007 * Tokens are consumed. 1008 * 1009 *----------------------------------------------------------------------- 1010 */ 1011 static Token 1012 CondT(Boolean doEval) 1013 { 1014 Token t; 1015 1016 t = CondToken(doEval); 1017 1018 if (t == TOK_EOF) { 1019 /* 1020 * If we reached the end of the expression, the expression 1021 * is malformed... 1022 */ 1023 t = TOK_ERROR; 1024 } else if (t == TOK_LPAREN) { 1025 /* 1026 * T -> ( E ) 1027 */ 1028 t = CondE(doEval); 1029 if (t != TOK_ERROR) { 1030 if (CondToken(doEval) != TOK_RPAREN) { 1031 t = TOK_ERROR; 1032 } 1033 } 1034 } else if (t == TOK_NOT) { 1035 t = CondT(doEval); 1036 if (t == TOK_TRUE) { 1037 t = TOK_FALSE; 1038 } else if (t == TOK_FALSE) { 1039 t = TOK_TRUE; 1040 } 1041 } 1042 return (t); 1043 } 1044 1045 /*- 1046 *----------------------------------------------------------------------- 1047 * CondF -- 1048 * Parse a conjunctive factor (nice name, wot?) 1049 * F -> T && F | T 1050 * 1051 * Results: 1052 * TOK_TRUE, TOK_FALSE or TOK_ERROR 1053 * 1054 * Side Effects: 1055 * Tokens are consumed. 1056 * 1057 *----------------------------------------------------------------------- 1058 */ 1059 static Token 1060 CondF(Boolean doEval) 1061 { 1062 Token l, o; 1063 1064 l = CondT(doEval); 1065 if (l != TOK_ERROR) { 1066 o = CondToken(doEval); 1067 1068 if (o == TOK_AND) { 1069 /* 1070 * F -> T && F 1071 * 1072 * If T is TOK_FALSE, the whole thing will be TOK_FALSE, but we have to 1073 * parse the r.h.s. anyway (to throw it away). 1074 * If T is TOK_TRUE, the result is the r.h.s., be it an TOK_ERROR or no. 1075 */ 1076 if (l == TOK_TRUE) { 1077 l = CondF(doEval); 1078 } else { 1079 (void)CondF(FALSE); 1080 } 1081 } else { 1082 /* 1083 * F -> T 1084 */ 1085 CondPushBack(o); 1086 } 1087 } 1088 return (l); 1089 } 1090 1091 /*- 1092 *----------------------------------------------------------------------- 1093 * CondE -- 1094 * Main expression production. 1095 * E -> F || E | F 1096 * 1097 * Results: 1098 * TOK_TRUE, TOK_FALSE or TOK_ERROR. 1099 * 1100 * Side Effects: 1101 * Tokens are, of course, consumed. 1102 * 1103 *----------------------------------------------------------------------- 1104 */ 1105 static Token 1106 CondE(Boolean doEval) 1107 { 1108 Token l, o; 1109 1110 l = CondF(doEval); 1111 if (l != TOK_ERROR) { 1112 o = CondToken(doEval); 1113 1114 if (o == TOK_OR) { 1115 /* 1116 * E -> F || E 1117 * 1118 * A similar thing occurs for ||, except that here we make sure 1119 * the l.h.s. is TOK_FALSE before we bother to evaluate the r.h.s. 1120 * Once again, if l is TOK_FALSE, the result is the r.h.s. and once 1121 * again if l is TOK_TRUE, we parse the r.h.s. to throw it away. 1122 */ 1123 if (l == TOK_FALSE) { 1124 l = CondE(doEval); 1125 } else { 1126 (void)CondE(FALSE); 1127 } 1128 } else { 1129 /* 1130 * E -> F 1131 */ 1132 CondPushBack(o); 1133 } 1134 } 1135 return (l); 1136 } 1137 1138 /*- 1139 *----------------------------------------------------------------------- 1140 * Cond_EvalExpression -- 1141 * Evaluate an expression in the passed line. The expression 1142 * consists of &&, ||, !, make(target), defined(variable) 1143 * and parenthetical groupings thereof. 1144 * 1145 * Results: 1146 * COND_PARSE if the condition was valid grammatically 1147 * COND_INVALID if not a valid conditional. 1148 * 1149 * (*value) is set to the boolean value of the condition 1150 * 1151 * Side Effects: 1152 * None. 1153 * 1154 *----------------------------------------------------------------------- 1155 */ 1156 int 1157 Cond_EvalExpression(const struct If *info, char *line, Boolean *value, int eprint, Boolean strictLHS) 1158 { 1159 static const struct If *dflt_info; 1160 const struct If *sv_if_info = if_info; 1161 char *sv_condExpr = condExpr; 1162 Token sv_condPushBack = condPushBack; 1163 int rval; 1164 1165 lhsStrict = strictLHS; 1166 1167 while (*line == ' ' || *line == '\t') 1168 line++; 1169 1170 if (info == NULL && (info = dflt_info) == NULL) { 1171 /* Scan for the entry for .if - it can't be first */ 1172 for (info = ifs; ; info++) 1173 if (info->form[0] == 0) 1174 break; 1175 dflt_info = info; 1176 } 1177 1178 if_info = info != NULL ? info : ifs + 4; 1179 condExpr = line; 1180 condPushBack = TOK_NONE; 1181 1182 rval = do_Cond_EvalExpression(value); 1183 1184 if (rval == COND_INVALID && eprint) 1185 Parse_Error(PARSE_FATAL, "Malformed conditional (%s)", line); 1186 1187 if_info = sv_if_info; 1188 condExpr = sv_condExpr; 1189 condPushBack = sv_condPushBack; 1190 1191 return rval; 1192 } 1193 1194 static int 1195 do_Cond_EvalExpression(Boolean *value) 1196 { 1197 1198 switch (CondE(TRUE)) { 1199 case TOK_TRUE: 1200 if (CondToken(TRUE) == TOK_EOF) { 1201 *value = TRUE; 1202 return COND_PARSE; 1203 } 1204 break; 1205 case TOK_FALSE: 1206 if (CondToken(TRUE) == TOK_EOF) { 1207 *value = FALSE; 1208 return COND_PARSE; 1209 } 1210 break; 1211 default: 1212 case TOK_ERROR: 1213 break; 1214 } 1215 1216 return COND_INVALID; 1217 } 1218 1219 1220 /*- 1221 *----------------------------------------------------------------------- 1222 * Cond_Eval -- 1223 * Evaluate the conditional in the passed line. The line 1224 * looks like this: 1225 * .<cond-type> <expr> 1226 * where <cond-type> is any of if, ifmake, ifnmake, ifdef, 1227 * ifndef, elif, elifmake, elifnmake, elifdef, elifndef 1228 * and <expr> consists of &&, ||, !, make(target), defined(variable) 1229 * and parenthetical groupings thereof. 1230 * 1231 * Input: 1232 * line Line to parse 1233 * 1234 * Results: 1235 * COND_PARSE if should parse lines after the conditional 1236 * COND_SKIP if should skip lines after the conditional 1237 * COND_INVALID if not a valid conditional. 1238 * 1239 * Side Effects: 1240 * None. 1241 * 1242 * Note that the states IF_ACTIVE and ELSE_ACTIVE are only different in order 1243 * to detect splurious .else lines (as are SKIP_TO_ELSE and SKIP_TO_ENDIF) 1244 * otherwise .else could be treated as '.elif 1'. 1245 * 1246 *----------------------------------------------------------------------- 1247 */ 1248 int 1249 Cond_Eval(char *line) 1250 { 1251 #define MAXIF 128 /* maximum depth of .if'ing */ 1252 #define MAXIF_BUMP 32 /* how much to grow by */ 1253 enum if_states { 1254 IF_ACTIVE, /* .if or .elif part active */ 1255 ELSE_ACTIVE, /* .else part active */ 1256 SEARCH_FOR_ELIF, /* searching for .elif/else to execute */ 1257 SKIP_TO_ELSE, /* has been true, but not seen '.else' */ 1258 SKIP_TO_ENDIF /* nothing else to execute */ 1259 }; 1260 static enum if_states *cond_state = NULL; 1261 static unsigned int max_if_depth = MAXIF; 1262 1263 const struct If *ifp; 1264 Boolean isElif; 1265 Boolean value; 1266 int level; /* Level at which to report errors. */ 1267 enum if_states state; 1268 1269 level = PARSE_FATAL; 1270 if (!cond_state) { 1271 cond_state = bmake_malloc(max_if_depth * sizeof(*cond_state)); 1272 cond_state[0] = IF_ACTIVE; 1273 } 1274 /* skip leading character (the '.') and any whitespace */ 1275 for (line++; *line == ' ' || *line == '\t'; line++) 1276 continue; 1277 1278 /* Find what type of if we're dealing with. */ 1279 if (line[0] == 'e') { 1280 if (line[1] != 'l') { 1281 if (!istoken(line + 1, "ndif", 4)) 1282 return COND_INVALID; 1283 /* End of conditional section */ 1284 if (cond_depth == cond_min_depth) { 1285 Parse_Error(level, "if-less endif"); 1286 return COND_PARSE; 1287 } 1288 /* Return state for previous conditional */ 1289 cond_depth--; 1290 return cond_state[cond_depth] <= ELSE_ACTIVE ? COND_PARSE : COND_SKIP; 1291 } 1292 1293 /* Quite likely this is 'else' or 'elif' */ 1294 line += 2; 1295 if (istoken(line, "se", 2)) { 1296 /* It is else... */ 1297 if (cond_depth == cond_min_depth) { 1298 Parse_Error(level, "if-less else"); 1299 return COND_PARSE; 1300 } 1301 1302 state = cond_state[cond_depth]; 1303 switch (state) { 1304 case SEARCH_FOR_ELIF: 1305 state = ELSE_ACTIVE; 1306 break; 1307 case ELSE_ACTIVE: 1308 case SKIP_TO_ENDIF: 1309 Parse_Error(PARSE_WARNING, "extra else"); 1310 /* FALLTHROUGH */ 1311 default: 1312 case IF_ACTIVE: 1313 case SKIP_TO_ELSE: 1314 state = SKIP_TO_ENDIF; 1315 break; 1316 } 1317 cond_state[cond_depth] = state; 1318 return state <= ELSE_ACTIVE ? COND_PARSE : COND_SKIP; 1319 } 1320 /* Assume for now it is an elif */ 1321 isElif = TRUE; 1322 } else 1323 isElif = FALSE; 1324 1325 if (line[0] != 'i' || line[1] != 'f') 1326 /* Not an ifxxx or elifxxx line */ 1327 return COND_INVALID; 1328 1329 /* 1330 * Figure out what sort of conditional it is -- what its default 1331 * function is, etc. -- by looking in the table of valid "ifs" 1332 */ 1333 line += 2; 1334 for (ifp = ifs; ; ifp++) { 1335 if (ifp->form == NULL) 1336 return COND_INVALID; 1337 if (istoken(ifp->form, line, ifp->formlen)) { 1338 line += ifp->formlen; 1339 break; 1340 } 1341 } 1342 1343 /* Now we know what sort of 'if' it is... */ 1344 1345 if (isElif) { 1346 if (cond_depth == cond_min_depth) { 1347 Parse_Error(level, "if-less elif"); 1348 return COND_PARSE; 1349 } 1350 state = cond_state[cond_depth]; 1351 if (state == SKIP_TO_ENDIF || state == ELSE_ACTIVE) { 1352 Parse_Error(PARSE_WARNING, "extra elif"); 1353 cond_state[cond_depth] = SKIP_TO_ENDIF; 1354 return COND_SKIP; 1355 } 1356 if (state != SEARCH_FOR_ELIF) { 1357 /* Either just finished the 'true' block, or already SKIP_TO_ELSE */ 1358 cond_state[cond_depth] = SKIP_TO_ELSE; 1359 return COND_SKIP; 1360 } 1361 } else { 1362 /* Normal .if */ 1363 if (cond_depth + 1 >= max_if_depth) { 1364 /* 1365 * This is rare, but not impossible. 1366 * In meta mode, dirdeps.mk (only runs at level 0) 1367 * can need more than the default. 1368 */ 1369 max_if_depth += MAXIF_BUMP; 1370 cond_state = bmake_realloc(cond_state, max_if_depth * 1371 sizeof(*cond_state)); 1372 } 1373 state = cond_state[cond_depth]; 1374 cond_depth++; 1375 if (state > ELSE_ACTIVE) { 1376 /* If we aren't parsing the data, treat as always false */ 1377 cond_state[cond_depth] = SKIP_TO_ELSE; 1378 return COND_SKIP; 1379 } 1380 } 1381 1382 /* And evaluate the conditional expresssion */ 1383 if (Cond_EvalExpression(ifp, line, &value, 1, TRUE) == COND_INVALID) { 1384 /* Syntax error in conditional, error message already output. */ 1385 /* Skip everything to matching .endif */ 1386 cond_state[cond_depth] = SKIP_TO_ELSE; 1387 return COND_SKIP; 1388 } 1389 1390 if (!value) { 1391 cond_state[cond_depth] = SEARCH_FOR_ELIF; 1392 return COND_SKIP; 1393 } 1394 cond_state[cond_depth] = IF_ACTIVE; 1395 return COND_PARSE; 1396 } 1397 1398 1399 1400 /*- 1401 *----------------------------------------------------------------------- 1402 * Cond_End -- 1403 * Make sure everything's clean at the end of a makefile. 1404 * 1405 * Results: 1406 * None. 1407 * 1408 * Side Effects: 1409 * Parse_Error will be called if open conditionals are around. 1410 * 1411 *----------------------------------------------------------------------- 1412 */ 1413 void 1414 Cond_restore_depth(unsigned int saved_depth) 1415 { 1416 int open_conds = cond_depth - cond_min_depth; 1417 1418 if (open_conds != 0 || saved_depth > cond_depth) { 1419 Parse_Error(PARSE_FATAL, "%d open conditional%s", open_conds, 1420 open_conds == 1 ? "" : "s"); 1421 cond_depth = cond_min_depth; 1422 } 1423 1424 cond_min_depth = saved_depth; 1425 } 1426 1427 unsigned int 1428 Cond_save_depth(void) 1429 { 1430 int depth = cond_min_depth; 1431 1432 cond_min_depth = cond_depth; 1433 return depth; 1434 } 1435