1 /* $NetBSD: var.c,v 1.186 2014/06/20 06:13:45 sjg Exp $ */ 2 3 /* 4 * Copyright (c) 1988, 1989, 1990, 1993 5 * The Regents of the University of California. 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) 1989 by Berkeley Softworks 37 * All rights reserved. 38 * 39 * This code is derived from software contributed to Berkeley by 40 * Adam de Boor. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. All advertising materials mentioning features or use of this software 51 * must display the following acknowledgement: 52 * This product includes software developed by the University of 53 * California, Berkeley and its contributors. 54 * 4. Neither the name of the University nor the names of its contributors 55 * may be used to endorse or promote products derived from this software 56 * without specific prior written permission. 57 * 58 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 59 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 60 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 61 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 62 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 63 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 64 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 65 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 66 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 67 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 68 * SUCH DAMAGE. 69 */ 70 71 #ifndef MAKE_NATIVE 72 static char rcsid[] = "$NetBSD: var.c,v 1.186 2014/06/20 06:13:45 sjg Exp $"; 73 #else 74 #include <sys/cdefs.h> 75 #ifndef lint 76 #if 0 77 static char sccsid[] = "@(#)var.c 8.3 (Berkeley) 3/19/94"; 78 #else 79 __RCSID("$NetBSD: var.c,v 1.186 2014/06/20 06:13:45 sjg Exp $"); 80 #endif 81 #endif /* not lint */ 82 #endif 83 84 /*- 85 * var.c -- 86 * Variable-handling functions 87 * 88 * Interface: 89 * Var_Set Set the value of a variable in the given 90 * context. The variable is created if it doesn't 91 * yet exist. The value and variable name need not 92 * be preserved. 93 * 94 * Var_Append Append more characters to an existing variable 95 * in the given context. The variable needn't 96 * exist already -- it will be created if it doesn't. 97 * A space is placed between the old value and the 98 * new one. 99 * 100 * Var_Exists See if a variable exists. 101 * 102 * Var_Value Return the value of a variable in a context or 103 * NULL if the variable is undefined. 104 * 105 * Var_Subst Substitute named variable, or all variables if 106 * NULL in a string using 107 * the given context as the top-most one. If the 108 * third argument is non-zero, Parse_Error is 109 * called if any variables are undefined. 110 * 111 * Var_Parse Parse a variable expansion from a string and 112 * return the result and the number of characters 113 * consumed. 114 * 115 * Var_Delete Delete a variable in a context. 116 * 117 * Var_Init Initialize this module. 118 * 119 * Debugging: 120 * Var_Dump Print out all variables defined in the given 121 * context. 122 * 123 * XXX: There's a lot of duplication in these functions. 124 */ 125 126 #include <sys/stat.h> 127 #ifndef NO_REGEX 128 #include <sys/types.h> 129 #include <regex.h> 130 #endif 131 #include <ctype.h> 132 #include <inttypes.h> 133 #include <stdlib.h> 134 #include <limits.h> 135 #include <time.h> 136 137 #include "make.h" 138 #include "buf.h" 139 #include "dir.h" 140 #include "job.h" 141 142 extern int makelevel; 143 /* 144 * This lets us tell if we have replaced the original environ 145 * (which we cannot free). 146 */ 147 char **savedEnv = NULL; 148 149 /* 150 * This is a harmless return value for Var_Parse that can be used by Var_Subst 151 * to determine if there was an error in parsing -- easier than returning 152 * a flag, as things outside this module don't give a hoot. 153 */ 154 char var_Error[] = ""; 155 156 /* 157 * Similar to var_Error, but returned when the 'errnum' flag for Var_Parse is 158 * set false. Why not just use a constant? Well, gcc likes to condense 159 * identical string instances... 160 */ 161 static char varNoError[] = ""; 162 163 /* 164 * Internally, variables are contained in four different contexts. 165 * 1) the environment. They may not be changed. If an environment 166 * variable is appended-to, the result is placed in the global 167 * context. 168 * 2) the global context. Variables set in the Makefile are located in 169 * the global context. It is the penultimate context searched when 170 * substituting. 171 * 3) the command-line context. All variables set on the command line 172 * are placed in this context. They are UNALTERABLE once placed here. 173 * 4) the local context. Each target has associated with it a context 174 * list. On this list are located the structures describing such 175 * local variables as $(@) and $(*) 176 * The four contexts are searched in the reverse order from which they are 177 * listed. 178 */ 179 GNode *VAR_INTERNAL; /* variables from make itself */ 180 GNode *VAR_GLOBAL; /* variables from the makefile */ 181 GNode *VAR_CMD; /* variables defined on the command-line */ 182 183 #define FIND_CMD 0x1 /* look in VAR_CMD when searching */ 184 #define FIND_GLOBAL 0x2 /* look in VAR_GLOBAL as well */ 185 #define FIND_ENV 0x4 /* look in the environment also */ 186 187 typedef struct Var { 188 char *name; /* the variable's name */ 189 Buffer val; /* its value */ 190 int flags; /* miscellaneous status flags */ 191 #define VAR_IN_USE 1 /* Variable's value currently being used. 192 * Used to avoid recursion */ 193 #define VAR_FROM_ENV 2 /* Variable comes from the environment */ 194 #define VAR_JUNK 4 /* Variable is a junk variable that 195 * should be destroyed when done with 196 * it. Used by Var_Parse for undefined, 197 * modified variables */ 198 #define VAR_KEEP 8 /* Variable is VAR_JUNK, but we found 199 * a use for it in some modifier and 200 * the value is therefore valid */ 201 #define VAR_EXPORTED 16 /* Variable is exported */ 202 #define VAR_REEXPORT 32 /* Indicate if var needs re-export. 203 * This would be true if it contains $'s 204 */ 205 #define VAR_FROM_CMD 64 /* Variable came from command line */ 206 } Var; 207 208 /* 209 * Exporting vars is expensive so skip it if we can 210 */ 211 #define VAR_EXPORTED_NONE 0 212 #define VAR_EXPORTED_YES 1 213 #define VAR_EXPORTED_ALL 2 214 static int var_exportedVars = VAR_EXPORTED_NONE; 215 /* 216 * We pass this to Var_Export when doing the initial export 217 * or after updating an exported var. 218 */ 219 #define VAR_EXPORT_PARENT 1 220 221 /* Var*Pattern flags */ 222 #define VAR_SUB_GLOBAL 0x01 /* Apply substitution globally */ 223 #define VAR_SUB_ONE 0x02 /* Apply substitution to one word */ 224 #define VAR_SUB_MATCHED 0x04 /* There was a match */ 225 #define VAR_MATCH_START 0x08 /* Match at start of word */ 226 #define VAR_MATCH_END 0x10 /* Match at end of word */ 227 #define VAR_NOSUBST 0x20 /* don't expand vars in VarGetPattern */ 228 229 /* Var_Set flags */ 230 #define VAR_NO_EXPORT 0x01 /* do not export */ 231 232 typedef struct { 233 /* 234 * The following fields are set by Var_Parse() when it 235 * encounters modifiers that need to keep state for use by 236 * subsequent modifiers within the same variable expansion. 237 */ 238 Byte varSpace; /* Word separator in expansions */ 239 Boolean oneBigWord; /* TRUE if we will treat the variable as a 240 * single big word, even if it contains 241 * embedded spaces (as opposed to the 242 * usual behaviour of treating it as 243 * several space-separated words). */ 244 } Var_Parse_State; 245 246 /* struct passed as 'void *' to VarSubstitute() for ":S/lhs/rhs/", 247 * to VarSYSVMatch() for ":lhs=rhs". */ 248 typedef struct { 249 const char *lhs; /* String to match */ 250 int leftLen; /* Length of string */ 251 const char *rhs; /* Replacement string (w/ &'s removed) */ 252 int rightLen; /* Length of replacement */ 253 int flags; 254 } VarPattern; 255 256 /* struct passed as 'void *' to VarLoopExpand() for ":@tvar@str@" */ 257 typedef struct { 258 GNode *ctxt; /* variable context */ 259 char *tvar; /* name of temp var */ 260 int tvarLen; 261 char *str; /* string to expand */ 262 int strLen; 263 int errnum; /* errnum for not defined */ 264 } VarLoop_t; 265 266 #ifndef NO_REGEX 267 /* struct passed as 'void *' to VarRESubstitute() for ":C///" */ 268 typedef struct { 269 regex_t re; 270 int nsub; 271 regmatch_t *matches; 272 char *replace; 273 int flags; 274 } VarREPattern; 275 #endif 276 277 /* struct passed to VarSelectWords() for ":[start..end]" */ 278 typedef struct { 279 int start; /* first word to select */ 280 int end; /* last word to select */ 281 } VarSelectWords_t; 282 283 static Var *VarFind(const char *, GNode *, int); 284 static void VarAdd(const char *, const char *, GNode *); 285 static Boolean VarHead(GNode *, Var_Parse_State *, 286 char *, Boolean, Buffer *, void *); 287 static Boolean VarTail(GNode *, Var_Parse_State *, 288 char *, Boolean, Buffer *, void *); 289 static Boolean VarSuffix(GNode *, Var_Parse_State *, 290 char *, Boolean, Buffer *, void *); 291 static Boolean VarRoot(GNode *, Var_Parse_State *, 292 char *, Boolean, Buffer *, void *); 293 static Boolean VarMatch(GNode *, Var_Parse_State *, 294 char *, Boolean, Buffer *, void *); 295 #ifdef SYSVVARSUB 296 static Boolean VarSYSVMatch(GNode *, Var_Parse_State *, 297 char *, Boolean, Buffer *, void *); 298 #endif 299 static Boolean VarNoMatch(GNode *, Var_Parse_State *, 300 char *, Boolean, Buffer *, void *); 301 #ifndef NO_REGEX 302 static void VarREError(int, regex_t *, const char *); 303 static Boolean VarRESubstitute(GNode *, Var_Parse_State *, 304 char *, Boolean, Buffer *, void *); 305 #endif 306 static Boolean VarSubstitute(GNode *, Var_Parse_State *, 307 char *, Boolean, Buffer *, void *); 308 static Boolean VarLoopExpand(GNode *, Var_Parse_State *, 309 char *, Boolean, Buffer *, void *); 310 static char *VarGetPattern(GNode *, Var_Parse_State *, 311 int, const char **, int, int *, int *, 312 VarPattern *); 313 static char *VarQuote(char *); 314 static char *VarHash(char *); 315 static char *VarModify(GNode *, Var_Parse_State *, 316 const char *, 317 Boolean (*)(GNode *, Var_Parse_State *, char *, Boolean, Buffer *, void *), 318 void *); 319 static char *VarOrder(const char *, const char); 320 static char *VarUniq(const char *); 321 static int VarWordCompare(const void *, const void *); 322 static void VarPrintVar(void *); 323 324 #define BROPEN '{' 325 #define BRCLOSE '}' 326 #define PROPEN '(' 327 #define PRCLOSE ')' 328 329 /*- 330 *----------------------------------------------------------------------- 331 * VarFind -- 332 * Find the given variable in the given context and any other contexts 333 * indicated. 334 * 335 * Input: 336 * name name to find 337 * ctxt context in which to find it 338 * flags FIND_GLOBAL set means to look in the 339 * VAR_GLOBAL context as well. FIND_CMD set means 340 * to look in the VAR_CMD context also. FIND_ENV 341 * set means to look in the environment 342 * 343 * Results: 344 * A pointer to the structure describing the desired variable or 345 * NULL if the variable does not exist. 346 * 347 * Side Effects: 348 * None 349 *----------------------------------------------------------------------- 350 */ 351 static Var * 352 VarFind(const char *name, GNode *ctxt, int flags) 353 { 354 Hash_Entry *var; 355 Var *v; 356 357 /* 358 * If the variable name begins with a '.', it could very well be one of 359 * the local ones. We check the name against all the local variables 360 * and substitute the short version in for 'name' if it matches one of 361 * them. 362 */ 363 if (*name == '.' && isupper((unsigned char) name[1])) 364 switch (name[1]) { 365 case 'A': 366 if (!strcmp(name, ".ALLSRC")) 367 name = ALLSRC; 368 if (!strcmp(name, ".ARCHIVE")) 369 name = ARCHIVE; 370 break; 371 case 'I': 372 if (!strcmp(name, ".IMPSRC")) 373 name = IMPSRC; 374 break; 375 case 'M': 376 if (!strcmp(name, ".MEMBER")) 377 name = MEMBER; 378 break; 379 case 'O': 380 if (!strcmp(name, ".OODATE")) 381 name = OODATE; 382 break; 383 case 'P': 384 if (!strcmp(name, ".PREFIX")) 385 name = PREFIX; 386 break; 387 case 'T': 388 if (!strcmp(name, ".TARGET")) 389 name = TARGET; 390 break; 391 } 392 #ifdef notyet 393 /* for compatibility with gmake */ 394 if (name[0] == '^' && name[1] == '\0') 395 name = ALLSRC; 396 #endif 397 398 /* 399 * First look for the variable in the given context. If it's not there, 400 * look for it in VAR_CMD, VAR_GLOBAL and the environment, in that order, 401 * depending on the FIND_* flags in 'flags' 402 */ 403 var = Hash_FindEntry(&ctxt->context, name); 404 405 if ((var == NULL) && (flags & FIND_CMD) && (ctxt != VAR_CMD)) { 406 var = Hash_FindEntry(&VAR_CMD->context, name); 407 } 408 if (!checkEnvFirst && (var == NULL) && (flags & FIND_GLOBAL) && 409 (ctxt != VAR_GLOBAL)) 410 { 411 var = Hash_FindEntry(&VAR_GLOBAL->context, name); 412 if ((var == NULL) && (ctxt != VAR_INTERNAL)) { 413 /* VAR_INTERNAL is subordinate to VAR_GLOBAL */ 414 var = Hash_FindEntry(&VAR_INTERNAL->context, name); 415 } 416 } 417 if ((var == NULL) && (flags & FIND_ENV)) { 418 char *env; 419 420 if ((env = getenv(name)) != NULL) { 421 int len; 422 423 v = bmake_malloc(sizeof(Var)); 424 v->name = bmake_strdup(name); 425 426 len = strlen(env); 427 428 Buf_Init(&v->val, len + 1); 429 Buf_AddBytes(&v->val, len, env); 430 431 v->flags = VAR_FROM_ENV; 432 return (v); 433 } else if (checkEnvFirst && (flags & FIND_GLOBAL) && 434 (ctxt != VAR_GLOBAL)) 435 { 436 var = Hash_FindEntry(&VAR_GLOBAL->context, name); 437 if ((var == NULL) && (ctxt != VAR_INTERNAL)) { 438 var = Hash_FindEntry(&VAR_INTERNAL->context, name); 439 } 440 if (var == NULL) { 441 return NULL; 442 } else { 443 return ((Var *)Hash_GetValue(var)); 444 } 445 } else { 446 return NULL; 447 } 448 } else if (var == NULL) { 449 return NULL; 450 } else { 451 return ((Var *)Hash_GetValue(var)); 452 } 453 } 454 455 /*- 456 *----------------------------------------------------------------------- 457 * VarFreeEnv -- 458 * If the variable is an environment variable, free it 459 * 460 * Input: 461 * v the variable 462 * destroy true if the value buffer should be destroyed. 463 * 464 * Results: 465 * 1 if it is an environment variable 0 ow. 466 * 467 * Side Effects: 468 * The variable is free'ed if it is an environent variable. 469 *----------------------------------------------------------------------- 470 */ 471 static Boolean 472 VarFreeEnv(Var *v, Boolean destroy) 473 { 474 if ((v->flags & VAR_FROM_ENV) == 0) 475 return FALSE; 476 free(v->name); 477 Buf_Destroy(&v->val, destroy); 478 free(v); 479 return TRUE; 480 } 481 482 /*- 483 *----------------------------------------------------------------------- 484 * VarAdd -- 485 * Add a new variable of name name and value val to the given context 486 * 487 * Input: 488 * name name of variable to add 489 * val value to set it to 490 * ctxt context in which to set it 491 * 492 * Results: 493 * None 494 * 495 * Side Effects: 496 * The new variable is placed at the front of the given context 497 * The name and val arguments are duplicated so they may 498 * safely be freed. 499 *----------------------------------------------------------------------- 500 */ 501 static void 502 VarAdd(const char *name, const char *val, GNode *ctxt) 503 { 504 Var *v; 505 int len; 506 Hash_Entry *h; 507 508 v = bmake_malloc(sizeof(Var)); 509 510 len = val ? strlen(val) : 0; 511 Buf_Init(&v->val, len+1); 512 Buf_AddBytes(&v->val, len, val); 513 514 v->flags = 0; 515 516 h = Hash_CreateEntry(&ctxt->context, name, NULL); 517 Hash_SetValue(h, v); 518 v->name = h->name; 519 if (DEBUG(VAR)) { 520 fprintf(debug_file, "%s:%s = %s\n", ctxt->name, name, val); 521 } 522 } 523 524 /*- 525 *----------------------------------------------------------------------- 526 * Var_Delete -- 527 * Remove a variable from a context. 528 * 529 * Results: 530 * None. 531 * 532 * Side Effects: 533 * The Var structure is removed and freed. 534 * 535 *----------------------------------------------------------------------- 536 */ 537 void 538 Var_Delete(const char *name, GNode *ctxt) 539 { 540 Hash_Entry *ln; 541 char *cp; 542 543 if (strchr(name, '$')) { 544 cp = Var_Subst(NULL, name, VAR_GLOBAL, 0); 545 } else { 546 cp = (char *)name; 547 } 548 ln = Hash_FindEntry(&ctxt->context, cp); 549 if (DEBUG(VAR)) { 550 fprintf(debug_file, "%s:delete %s%s\n", 551 ctxt->name, cp, ln ? "" : " (not found)"); 552 } 553 if (cp != name) { 554 free(cp); 555 } 556 if (ln != NULL) { 557 Var *v; 558 559 v = (Var *)Hash_GetValue(ln); 560 if ((v->flags & VAR_EXPORTED)) { 561 unsetenv(v->name); 562 } 563 if (strcmp(MAKE_EXPORTED, v->name) == 0) { 564 var_exportedVars = VAR_EXPORTED_NONE; 565 } 566 if (v->name != ln->name) 567 free(v->name); 568 Hash_DeleteEntry(&ctxt->context, ln); 569 Buf_Destroy(&v->val, TRUE); 570 free(v); 571 } 572 } 573 574 575 /* 576 * Export a var. 577 * We ignore make internal variables (those which start with '.') 578 * Also we jump through some hoops to avoid calling setenv 579 * more than necessary since it can leak. 580 * We only manipulate flags of vars if 'parent' is set. 581 */ 582 static int 583 Var_Export1(const char *name, int parent) 584 { 585 char tmp[BUFSIZ]; 586 Var *v; 587 char *val = NULL; 588 int n; 589 590 if (*name == '.') 591 return 0; /* skip internals */ 592 if (!name[1]) { 593 /* 594 * A single char. 595 * If it is one of the vars that should only appear in 596 * local context, skip it, else we can get Var_Subst 597 * into a loop. 598 */ 599 switch (name[0]) { 600 case '@': 601 case '%': 602 case '*': 603 case '!': 604 return 0; 605 } 606 } 607 v = VarFind(name, VAR_GLOBAL, 0); 608 if (v == NULL) { 609 return 0; 610 } 611 if (!parent && 612 (v->flags & (VAR_EXPORTED|VAR_REEXPORT)) == VAR_EXPORTED) { 613 return 0; /* nothing to do */ 614 } 615 val = Buf_GetAll(&v->val, NULL); 616 if (strchr(val, '$')) { 617 if (parent) { 618 /* 619 * Flag this as something we need to re-export. 620 * No point actually exporting it now though, 621 * the child can do it at the last minute. 622 */ 623 v->flags |= (VAR_EXPORTED|VAR_REEXPORT); 624 return 1; 625 } 626 if (v->flags & VAR_IN_USE) { 627 /* 628 * We recursed while exporting in a child. 629 * This isn't going to end well, just skip it. 630 */ 631 return 0; 632 } 633 n = snprintf(tmp, sizeof(tmp), "${%s}", name); 634 if (n < (int)sizeof(tmp)) { 635 val = Var_Subst(NULL, tmp, VAR_GLOBAL, 0); 636 setenv(name, val, 1); 637 free(val); 638 } 639 } else { 640 if (parent) { 641 v->flags &= ~VAR_REEXPORT; /* once will do */ 642 } 643 if (parent || !(v->flags & VAR_EXPORTED)) { 644 setenv(name, val, 1); 645 } 646 } 647 /* 648 * This is so Var_Set knows to call Var_Export again... 649 */ 650 if (parent) { 651 v->flags |= VAR_EXPORTED; 652 } 653 return 1; 654 } 655 656 /* 657 * This gets called from our children. 658 */ 659 void 660 Var_ExportVars(void) 661 { 662 char tmp[BUFSIZ]; 663 Hash_Entry *var; 664 Hash_Search state; 665 Var *v; 666 char *val; 667 int n; 668 669 /* 670 * Several make's support this sort of mechanism for tracking 671 * recursion - but each uses a different name. 672 * We allow the makefiles to update MAKELEVEL and ensure 673 * children see a correctly incremented value. 674 */ 675 snprintf(tmp, sizeof(tmp), "%d", makelevel + 1); 676 setenv(MAKE_LEVEL_ENV, tmp, 1); 677 678 if (VAR_EXPORTED_NONE == var_exportedVars) 679 return; 680 681 if (VAR_EXPORTED_ALL == var_exportedVars) { 682 /* 683 * Ouch! This is crazy... 684 */ 685 for (var = Hash_EnumFirst(&VAR_GLOBAL->context, &state); 686 var != NULL; 687 var = Hash_EnumNext(&state)) { 688 v = (Var *)Hash_GetValue(var); 689 Var_Export1(v->name, 0); 690 } 691 return; 692 } 693 /* 694 * We have a number of exported vars, 695 */ 696 n = snprintf(tmp, sizeof(tmp), "${" MAKE_EXPORTED ":O:u}"); 697 if (n < (int)sizeof(tmp)) { 698 char **av; 699 char *as; 700 int ac; 701 int i; 702 703 val = Var_Subst(NULL, tmp, VAR_GLOBAL, 0); 704 av = brk_string(val, &ac, FALSE, &as); 705 for (i = 0; i < ac; i++) { 706 Var_Export1(av[i], 0); 707 } 708 free(val); 709 free(as); 710 free(av); 711 } 712 } 713 714 /* 715 * This is called when .export is seen or 716 * .MAKE.EXPORTED is modified. 717 * It is also called when any exported var is modified. 718 */ 719 void 720 Var_Export(char *str, int isExport) 721 { 722 char *name; 723 char *val; 724 char **av; 725 char *as; 726 int track; 727 int ac; 728 int i; 729 730 if (isExport && (!str || !str[0])) { 731 var_exportedVars = VAR_EXPORTED_ALL; /* use with caution! */ 732 return; 733 } 734 735 if (strncmp(str, "-env", 4) == 0) { 736 track = 0; 737 str += 4; 738 } else { 739 track = VAR_EXPORT_PARENT; 740 } 741 val = Var_Subst(NULL, str, VAR_GLOBAL, 0); 742 av = brk_string(val, &ac, FALSE, &as); 743 for (i = 0; i < ac; i++) { 744 name = av[i]; 745 if (!name[1]) { 746 /* 747 * A single char. 748 * If it is one of the vars that should only appear in 749 * local context, skip it, else we can get Var_Subst 750 * into a loop. 751 */ 752 switch (name[0]) { 753 case '@': 754 case '%': 755 case '*': 756 case '!': 757 continue; 758 } 759 } 760 if (Var_Export1(name, track)) { 761 if (VAR_EXPORTED_ALL != var_exportedVars) 762 var_exportedVars = VAR_EXPORTED_YES; 763 if (isExport && track) { 764 Var_Append(MAKE_EXPORTED, name, VAR_GLOBAL); 765 } 766 } 767 } 768 free(val); 769 free(as); 770 free(av); 771 } 772 773 774 /* 775 * This is called when .unexport[-env] is seen. 776 */ 777 extern char **environ; 778 779 void 780 Var_UnExport(char *str) 781 { 782 char tmp[BUFSIZ]; 783 char *vlist; 784 char *cp; 785 Boolean unexport_env; 786 int n; 787 788 if (!str || !str[0]) { 789 return; /* assert? */ 790 } 791 792 vlist = NULL; 793 794 str += 8; 795 unexport_env = (strncmp(str, "-env", 4) == 0); 796 if (unexport_env) { 797 char **newenv; 798 799 cp = getenv(MAKE_LEVEL_ENV); /* we should preserve this */ 800 if (environ == savedEnv) { 801 /* we have been here before! */ 802 newenv = bmake_realloc(environ, 2 * sizeof(char *)); 803 } else { 804 if (savedEnv) { 805 free(savedEnv); 806 savedEnv = NULL; 807 } 808 newenv = bmake_malloc(2 * sizeof(char *)); 809 } 810 if (!newenv) 811 return; 812 /* Note: we cannot safely free() the original environ. */ 813 environ = savedEnv = newenv; 814 newenv[0] = NULL; 815 newenv[1] = NULL; 816 setenv(MAKE_LEVEL_ENV, cp, 1); 817 } else { 818 for (; *str != '\n' && isspace((unsigned char) *str); str++) 819 continue; 820 if (str[0] && str[0] != '\n') { 821 vlist = str; 822 } 823 } 824 825 if (!vlist) { 826 /* Using .MAKE.EXPORTED */ 827 n = snprintf(tmp, sizeof(tmp), "${" MAKE_EXPORTED ":O:u}"); 828 if (n < (int)sizeof(tmp)) { 829 vlist = Var_Subst(NULL, tmp, VAR_GLOBAL, 0); 830 } 831 } 832 if (vlist) { 833 Var *v; 834 char **av; 835 char *as; 836 int ac; 837 int i; 838 839 av = brk_string(vlist, &ac, FALSE, &as); 840 for (i = 0; i < ac; i++) { 841 v = VarFind(av[i], VAR_GLOBAL, 0); 842 if (!v) 843 continue; 844 if (!unexport_env && 845 (v->flags & (VAR_EXPORTED|VAR_REEXPORT)) == VAR_EXPORTED) { 846 unsetenv(v->name); 847 } 848 v->flags &= ~(VAR_EXPORTED|VAR_REEXPORT); 849 /* 850 * If we are unexporting a list, 851 * remove each one from .MAKE.EXPORTED. 852 * If we are removing them all, 853 * just delete .MAKE.EXPORTED below. 854 */ 855 if (vlist == str) { 856 n = snprintf(tmp, sizeof(tmp), 857 "${" MAKE_EXPORTED ":N%s}", v->name); 858 if (n < (int)sizeof(tmp)) { 859 cp = Var_Subst(NULL, tmp, VAR_GLOBAL, 0); 860 Var_Set(MAKE_EXPORTED, cp, VAR_GLOBAL, 0); 861 free(cp); 862 } 863 } 864 } 865 free(as); 866 free(av); 867 if (vlist != str) { 868 Var_Delete(MAKE_EXPORTED, VAR_GLOBAL); 869 free(vlist); 870 } 871 } 872 } 873 874 /*- 875 *----------------------------------------------------------------------- 876 * Var_Set -- 877 * Set the variable name to the value val in the given context. 878 * 879 * Input: 880 * name name of variable to set 881 * val value to give to the variable 882 * ctxt context in which to set it 883 * 884 * Results: 885 * None. 886 * 887 * Side Effects: 888 * If the variable doesn't yet exist, a new record is created for it. 889 * Else the old value is freed and the new one stuck in its place 890 * 891 * Notes: 892 * The variable is searched for only in its context before being 893 * created in that context. I.e. if the context is VAR_GLOBAL, 894 * only VAR_GLOBAL->context is searched. Likewise if it is VAR_CMD, only 895 * VAR_CMD->context is searched. This is done to avoid the literally 896 * thousands of unnecessary strcmp's that used to be done to 897 * set, say, $(@) or $(<). 898 * If the context is VAR_GLOBAL though, we check if the variable 899 * was set in VAR_CMD from the command line and skip it if so. 900 *----------------------------------------------------------------------- 901 */ 902 void 903 Var_Set(const char *name, const char *val, GNode *ctxt, int flags) 904 { 905 Var *v; 906 char *expanded_name = NULL; 907 908 /* 909 * We only look for a variable in the given context since anything set 910 * here will override anything in a lower context, so there's not much 911 * point in searching them all just to save a bit of memory... 912 */ 913 if (strchr(name, '$') != NULL) { 914 expanded_name = Var_Subst(NULL, name, ctxt, 0); 915 if (expanded_name[0] == 0) { 916 if (DEBUG(VAR)) { 917 fprintf(debug_file, "Var_Set(\"%s\", \"%s\", ...) " 918 "name expands to empty string - ignored\n", 919 name, val); 920 } 921 free(expanded_name); 922 return; 923 } 924 name = expanded_name; 925 } 926 if (ctxt == VAR_GLOBAL) { 927 v = VarFind(name, VAR_CMD, 0); 928 if (v != NULL) { 929 if ((v->flags & VAR_FROM_CMD)) { 930 if (DEBUG(VAR)) { 931 fprintf(debug_file, "%s:%s = %s ignored!\n", ctxt->name, name, val); 932 } 933 goto out; 934 } 935 VarFreeEnv(v, TRUE); 936 } 937 } 938 v = VarFind(name, ctxt, 0); 939 if (v == NULL) { 940 if (ctxt == VAR_CMD && (flags & VAR_NO_EXPORT) == 0) { 941 /* 942 * This var would normally prevent the same name being added 943 * to VAR_GLOBAL, so delete it from there if needed. 944 * Otherwise -V name may show the wrong value. 945 */ 946 Var_Delete(name, VAR_GLOBAL); 947 } 948 VarAdd(name, val, ctxt); 949 } else { 950 Buf_Empty(&v->val); 951 Buf_AddBytes(&v->val, strlen(val), val); 952 953 if (DEBUG(VAR)) { 954 fprintf(debug_file, "%s:%s = %s\n", ctxt->name, name, val); 955 } 956 if ((v->flags & VAR_EXPORTED)) { 957 Var_Export1(name, VAR_EXPORT_PARENT); 958 } 959 } 960 /* 961 * Any variables given on the command line are automatically exported 962 * to the environment (as per POSIX standard) 963 */ 964 if (ctxt == VAR_CMD && (flags & VAR_NO_EXPORT) == 0) { 965 if (v == NULL) { 966 /* we just added it */ 967 v = VarFind(name, ctxt, 0); 968 } 969 if (v != NULL) 970 v->flags |= VAR_FROM_CMD; 971 /* 972 * If requested, don't export these in the environment 973 * individually. We still put them in MAKEOVERRIDES so 974 * that the command-line settings continue to override 975 * Makefile settings. 976 */ 977 if (varNoExportEnv != TRUE) 978 setenv(name, val, 1); 979 980 Var_Append(MAKEOVERRIDES, name, VAR_GLOBAL); 981 } 982 983 984 out: 985 if (expanded_name != NULL) 986 free(expanded_name); 987 if (v != NULL) 988 VarFreeEnv(v, TRUE); 989 } 990 991 /*- 992 *----------------------------------------------------------------------- 993 * Var_Append -- 994 * The variable of the given name has the given value appended to it in 995 * the given context. 996 * 997 * Input: 998 * name name of variable to modify 999 * val String to append to it 1000 * ctxt Context in which this should occur 1001 * 1002 * Results: 1003 * None 1004 * 1005 * Side Effects: 1006 * If the variable doesn't exist, it is created. Else the strings 1007 * are concatenated (with a space in between). 1008 * 1009 * Notes: 1010 * Only if the variable is being sought in the global context is the 1011 * environment searched. 1012 * XXX: Knows its calling circumstances in that if called with ctxt 1013 * an actual target, it will only search that context since only 1014 * a local variable could be being appended to. This is actually 1015 * a big win and must be tolerated. 1016 *----------------------------------------------------------------------- 1017 */ 1018 void 1019 Var_Append(const char *name, const char *val, GNode *ctxt) 1020 { 1021 Var *v; 1022 Hash_Entry *h; 1023 char *expanded_name = NULL; 1024 1025 if (strchr(name, '$') != NULL) { 1026 expanded_name = Var_Subst(NULL, name, ctxt, 0); 1027 if (expanded_name[0] == 0) { 1028 if (DEBUG(VAR)) { 1029 fprintf(debug_file, "Var_Append(\"%s\", \"%s\", ...) " 1030 "name expands to empty string - ignored\n", 1031 name, val); 1032 } 1033 free(expanded_name); 1034 return; 1035 } 1036 name = expanded_name; 1037 } 1038 1039 v = VarFind(name, ctxt, (ctxt == VAR_GLOBAL) ? FIND_ENV : 0); 1040 1041 if (v == NULL) { 1042 VarAdd(name, val, ctxt); 1043 } else { 1044 Buf_AddByte(&v->val, ' '); 1045 Buf_AddBytes(&v->val, strlen(val), val); 1046 1047 if (DEBUG(VAR)) { 1048 fprintf(debug_file, "%s:%s = %s\n", ctxt->name, name, 1049 Buf_GetAll(&v->val, NULL)); 1050 } 1051 1052 if (v->flags & VAR_FROM_ENV) { 1053 /* 1054 * If the original variable came from the environment, we 1055 * have to install it in the global context (we could place 1056 * it in the environment, but then we should provide a way to 1057 * export other variables...) 1058 */ 1059 v->flags &= ~VAR_FROM_ENV; 1060 h = Hash_CreateEntry(&ctxt->context, name, NULL); 1061 Hash_SetValue(h, v); 1062 } 1063 } 1064 if (expanded_name != NULL) 1065 free(expanded_name); 1066 } 1067 1068 /*- 1069 *----------------------------------------------------------------------- 1070 * Var_Exists -- 1071 * See if the given variable exists. 1072 * 1073 * Input: 1074 * name Variable to find 1075 * ctxt Context in which to start search 1076 * 1077 * Results: 1078 * TRUE if it does, FALSE if it doesn't 1079 * 1080 * Side Effects: 1081 * None. 1082 * 1083 *----------------------------------------------------------------------- 1084 */ 1085 Boolean 1086 Var_Exists(const char *name, GNode *ctxt) 1087 { 1088 Var *v; 1089 char *cp; 1090 1091 if ((cp = strchr(name, '$')) != NULL) { 1092 cp = Var_Subst(NULL, name, ctxt, FALSE); 1093 } 1094 v = VarFind(cp ? cp : name, ctxt, FIND_CMD|FIND_GLOBAL|FIND_ENV); 1095 if (cp != NULL) { 1096 free(cp); 1097 } 1098 if (v == NULL) { 1099 return(FALSE); 1100 } else { 1101 (void)VarFreeEnv(v, TRUE); 1102 } 1103 return(TRUE); 1104 } 1105 1106 /*- 1107 *----------------------------------------------------------------------- 1108 * Var_Value -- 1109 * Return the value of the named variable in the given context 1110 * 1111 * Input: 1112 * name name to find 1113 * ctxt context in which to search for it 1114 * 1115 * Results: 1116 * The value if the variable exists, NULL if it doesn't 1117 * 1118 * Side Effects: 1119 * None 1120 *----------------------------------------------------------------------- 1121 */ 1122 char * 1123 Var_Value(const char *name, GNode *ctxt, char **frp) 1124 { 1125 Var *v; 1126 1127 v = VarFind(name, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD); 1128 *frp = NULL; 1129 if (v != NULL) { 1130 char *p = (Buf_GetAll(&v->val, NULL)); 1131 if (VarFreeEnv(v, FALSE)) 1132 *frp = p; 1133 return p; 1134 } else { 1135 return NULL; 1136 } 1137 } 1138 1139 /*- 1140 *----------------------------------------------------------------------- 1141 * VarHead -- 1142 * Remove the tail of the given word and place the result in the given 1143 * buffer. 1144 * 1145 * Input: 1146 * word Word to trim 1147 * addSpace True if need to add a space to the buffer 1148 * before sticking in the head 1149 * buf Buffer in which to store it 1150 * 1151 * Results: 1152 * TRUE if characters were added to the buffer (a space needs to be 1153 * added to the buffer before the next word). 1154 * 1155 * Side Effects: 1156 * The trimmed word is added to the buffer. 1157 * 1158 *----------------------------------------------------------------------- 1159 */ 1160 static Boolean 1161 VarHead(GNode *ctx MAKE_ATTR_UNUSED, Var_Parse_State *vpstate, 1162 char *word, Boolean addSpace, Buffer *buf, 1163 void *dummy) 1164 { 1165 char *slash; 1166 1167 slash = strrchr(word, '/'); 1168 if (slash != NULL) { 1169 if (addSpace && vpstate->varSpace) { 1170 Buf_AddByte(buf, vpstate->varSpace); 1171 } 1172 *slash = '\0'; 1173 Buf_AddBytes(buf, strlen(word), word); 1174 *slash = '/'; 1175 return (TRUE); 1176 } else { 1177 /* 1178 * If no directory part, give . (q.v. the POSIX standard) 1179 */ 1180 if (addSpace && vpstate->varSpace) 1181 Buf_AddByte(buf, vpstate->varSpace); 1182 Buf_AddByte(buf, '.'); 1183 } 1184 return(dummy ? TRUE : TRUE); 1185 } 1186 1187 /*- 1188 *----------------------------------------------------------------------- 1189 * VarTail -- 1190 * Remove the head of the given word and place the result in the given 1191 * buffer. 1192 * 1193 * Input: 1194 * word Word to trim 1195 * addSpace True if need to add a space to the buffer 1196 * before adding the tail 1197 * buf Buffer in which to store it 1198 * 1199 * Results: 1200 * TRUE if characters were added to the buffer (a space needs to be 1201 * added to the buffer before the next word). 1202 * 1203 * Side Effects: 1204 * The trimmed word is added to the buffer. 1205 * 1206 *----------------------------------------------------------------------- 1207 */ 1208 static Boolean 1209 VarTail(GNode *ctx MAKE_ATTR_UNUSED, Var_Parse_State *vpstate, 1210 char *word, Boolean addSpace, Buffer *buf, 1211 void *dummy) 1212 { 1213 char *slash; 1214 1215 if (addSpace && vpstate->varSpace) { 1216 Buf_AddByte(buf, vpstate->varSpace); 1217 } 1218 1219 slash = strrchr(word, '/'); 1220 if (slash != NULL) { 1221 *slash++ = '\0'; 1222 Buf_AddBytes(buf, strlen(slash), slash); 1223 slash[-1] = '/'; 1224 } else { 1225 Buf_AddBytes(buf, strlen(word), word); 1226 } 1227 return (dummy ? TRUE : TRUE); 1228 } 1229 1230 /*- 1231 *----------------------------------------------------------------------- 1232 * VarSuffix -- 1233 * Place the suffix of the given word in the given buffer. 1234 * 1235 * Input: 1236 * word Word to trim 1237 * addSpace TRUE if need to add a space before placing the 1238 * suffix in the buffer 1239 * buf Buffer in which to store it 1240 * 1241 * Results: 1242 * TRUE if characters were added to the buffer (a space needs to be 1243 * added to the buffer before the next word). 1244 * 1245 * Side Effects: 1246 * The suffix from the word is placed in the buffer. 1247 * 1248 *----------------------------------------------------------------------- 1249 */ 1250 static Boolean 1251 VarSuffix(GNode *ctx MAKE_ATTR_UNUSED, Var_Parse_State *vpstate, 1252 char *word, Boolean addSpace, Buffer *buf, 1253 void *dummy) 1254 { 1255 char *dot; 1256 1257 dot = strrchr(word, '.'); 1258 if (dot != NULL) { 1259 if (addSpace && vpstate->varSpace) { 1260 Buf_AddByte(buf, vpstate->varSpace); 1261 } 1262 *dot++ = '\0'; 1263 Buf_AddBytes(buf, strlen(dot), dot); 1264 dot[-1] = '.'; 1265 addSpace = TRUE; 1266 } 1267 return (dummy ? addSpace : addSpace); 1268 } 1269 1270 /*- 1271 *----------------------------------------------------------------------- 1272 * VarRoot -- 1273 * Remove the suffix of the given word and place the result in the 1274 * buffer. 1275 * 1276 * Input: 1277 * word Word to trim 1278 * addSpace TRUE if need to add a space to the buffer 1279 * before placing the root in it 1280 * buf Buffer in which to store it 1281 * 1282 * Results: 1283 * TRUE if characters were added to the buffer (a space needs to be 1284 * added to the buffer before the next word). 1285 * 1286 * Side Effects: 1287 * The trimmed word is added to the buffer. 1288 * 1289 *----------------------------------------------------------------------- 1290 */ 1291 static Boolean 1292 VarRoot(GNode *ctx MAKE_ATTR_UNUSED, Var_Parse_State *vpstate, 1293 char *word, Boolean addSpace, Buffer *buf, 1294 void *dummy) 1295 { 1296 char *dot; 1297 1298 if (addSpace && vpstate->varSpace) { 1299 Buf_AddByte(buf, vpstate->varSpace); 1300 } 1301 1302 dot = strrchr(word, '.'); 1303 if (dot != NULL) { 1304 *dot = '\0'; 1305 Buf_AddBytes(buf, strlen(word), word); 1306 *dot = '.'; 1307 } else { 1308 Buf_AddBytes(buf, strlen(word), word); 1309 } 1310 return (dummy ? TRUE : TRUE); 1311 } 1312 1313 /*- 1314 *----------------------------------------------------------------------- 1315 * VarMatch -- 1316 * Place the word in the buffer if it matches the given pattern. 1317 * Callback function for VarModify to implement the :M modifier. 1318 * 1319 * Input: 1320 * word Word to examine 1321 * addSpace TRUE if need to add a space to the buffer 1322 * before adding the word, if it matches 1323 * buf Buffer in which to store it 1324 * pattern Pattern the word must match 1325 * 1326 * Results: 1327 * TRUE if a space should be placed in the buffer before the next 1328 * word. 1329 * 1330 * Side Effects: 1331 * The word may be copied to the buffer. 1332 * 1333 *----------------------------------------------------------------------- 1334 */ 1335 static Boolean 1336 VarMatch(GNode *ctx MAKE_ATTR_UNUSED, Var_Parse_State *vpstate, 1337 char *word, Boolean addSpace, Buffer *buf, 1338 void *pattern) 1339 { 1340 if (DEBUG(VAR)) 1341 fprintf(debug_file, "VarMatch [%s] [%s]\n", word, (char *)pattern); 1342 if (Str_Match(word, (char *)pattern)) { 1343 if (addSpace && vpstate->varSpace) { 1344 Buf_AddByte(buf, vpstate->varSpace); 1345 } 1346 addSpace = TRUE; 1347 Buf_AddBytes(buf, strlen(word), word); 1348 } 1349 return(addSpace); 1350 } 1351 1352 #ifdef SYSVVARSUB 1353 /*- 1354 *----------------------------------------------------------------------- 1355 * VarSYSVMatch -- 1356 * Place the word in the buffer if it matches the given pattern. 1357 * Callback function for VarModify to implement the System V % 1358 * modifiers. 1359 * 1360 * Input: 1361 * word Word to examine 1362 * addSpace TRUE if need to add a space to the buffer 1363 * before adding the word, if it matches 1364 * buf Buffer in which to store it 1365 * patp Pattern the word must match 1366 * 1367 * Results: 1368 * TRUE if a space should be placed in the buffer before the next 1369 * word. 1370 * 1371 * Side Effects: 1372 * The word may be copied to the buffer. 1373 * 1374 *----------------------------------------------------------------------- 1375 */ 1376 static Boolean 1377 VarSYSVMatch(GNode *ctx, Var_Parse_State *vpstate, 1378 char *word, Boolean addSpace, Buffer *buf, 1379 void *patp) 1380 { 1381 int len; 1382 char *ptr; 1383 VarPattern *pat = (VarPattern *)patp; 1384 char *varexp; 1385 1386 if (addSpace && vpstate->varSpace) 1387 Buf_AddByte(buf, vpstate->varSpace); 1388 1389 addSpace = TRUE; 1390 1391 if ((ptr = Str_SYSVMatch(word, pat->lhs, &len)) != NULL) { 1392 varexp = Var_Subst(NULL, pat->rhs, ctx, 0); 1393 Str_SYSVSubst(buf, varexp, ptr, len); 1394 free(varexp); 1395 } else { 1396 Buf_AddBytes(buf, strlen(word), word); 1397 } 1398 1399 return(addSpace); 1400 } 1401 #endif 1402 1403 1404 /*- 1405 *----------------------------------------------------------------------- 1406 * VarNoMatch -- 1407 * Place the word in the buffer if it doesn't match the given pattern. 1408 * Callback function for VarModify to implement the :N modifier. 1409 * 1410 * Input: 1411 * word Word to examine 1412 * addSpace TRUE if need to add a space to the buffer 1413 * before adding the word, if it matches 1414 * buf Buffer in which to store it 1415 * pattern Pattern the word must match 1416 * 1417 * Results: 1418 * TRUE if a space should be placed in the buffer before the next 1419 * word. 1420 * 1421 * Side Effects: 1422 * The word may be copied to the buffer. 1423 * 1424 *----------------------------------------------------------------------- 1425 */ 1426 static Boolean 1427 VarNoMatch(GNode *ctx MAKE_ATTR_UNUSED, Var_Parse_State *vpstate, 1428 char *word, Boolean addSpace, Buffer *buf, 1429 void *pattern) 1430 { 1431 if (!Str_Match(word, (char *)pattern)) { 1432 if (addSpace && vpstate->varSpace) { 1433 Buf_AddByte(buf, vpstate->varSpace); 1434 } 1435 addSpace = TRUE; 1436 Buf_AddBytes(buf, strlen(word), word); 1437 } 1438 return(addSpace); 1439 } 1440 1441 1442 /*- 1443 *----------------------------------------------------------------------- 1444 * VarSubstitute -- 1445 * Perform a string-substitution on the given word, placing the 1446 * result in the passed buffer. 1447 * 1448 * Input: 1449 * word Word to modify 1450 * addSpace True if space should be added before 1451 * other characters 1452 * buf Buffer for result 1453 * patternp Pattern for substitution 1454 * 1455 * Results: 1456 * TRUE if a space is needed before more characters are added. 1457 * 1458 * Side Effects: 1459 * None. 1460 * 1461 *----------------------------------------------------------------------- 1462 */ 1463 static Boolean 1464 VarSubstitute(GNode *ctx MAKE_ATTR_UNUSED, Var_Parse_State *vpstate, 1465 char *word, Boolean addSpace, Buffer *buf, 1466 void *patternp) 1467 { 1468 int wordLen; /* Length of word */ 1469 char *cp; /* General pointer */ 1470 VarPattern *pattern = (VarPattern *)patternp; 1471 1472 wordLen = strlen(word); 1473 if ((pattern->flags & (VAR_SUB_ONE|VAR_SUB_MATCHED)) != 1474 (VAR_SUB_ONE|VAR_SUB_MATCHED)) { 1475 /* 1476 * Still substituting -- break it down into simple anchored cases 1477 * and if none of them fits, perform the general substitution case. 1478 */ 1479 if ((pattern->flags & VAR_MATCH_START) && 1480 (strncmp(word, pattern->lhs, pattern->leftLen) == 0)) { 1481 /* 1482 * Anchored at start and beginning of word matches pattern 1483 */ 1484 if ((pattern->flags & VAR_MATCH_END) && 1485 (wordLen == pattern->leftLen)) { 1486 /* 1487 * Also anchored at end and matches to the end (word 1488 * is same length as pattern) add space and rhs only 1489 * if rhs is non-null. 1490 */ 1491 if (pattern->rightLen != 0) { 1492 if (addSpace && vpstate->varSpace) { 1493 Buf_AddByte(buf, vpstate->varSpace); 1494 } 1495 addSpace = TRUE; 1496 Buf_AddBytes(buf, pattern->rightLen, pattern->rhs); 1497 } 1498 pattern->flags |= VAR_SUB_MATCHED; 1499 } else if (pattern->flags & VAR_MATCH_END) { 1500 /* 1501 * Doesn't match to end -- copy word wholesale 1502 */ 1503 goto nosub; 1504 } else { 1505 /* 1506 * Matches at start but need to copy in trailing characters 1507 */ 1508 if ((pattern->rightLen + wordLen - pattern->leftLen) != 0){ 1509 if (addSpace && vpstate->varSpace) { 1510 Buf_AddByte(buf, vpstate->varSpace); 1511 } 1512 addSpace = TRUE; 1513 } 1514 Buf_AddBytes(buf, pattern->rightLen, pattern->rhs); 1515 Buf_AddBytes(buf, wordLen - pattern->leftLen, 1516 (word + pattern->leftLen)); 1517 pattern->flags |= VAR_SUB_MATCHED; 1518 } 1519 } else if (pattern->flags & VAR_MATCH_START) { 1520 /* 1521 * Had to match at start of word and didn't -- copy whole word. 1522 */ 1523 goto nosub; 1524 } else if (pattern->flags & VAR_MATCH_END) { 1525 /* 1526 * Anchored at end, Find only place match could occur (leftLen 1527 * characters from the end of the word) and see if it does. Note 1528 * that because the $ will be left at the end of the lhs, we have 1529 * to use strncmp. 1530 */ 1531 cp = word + (wordLen - pattern->leftLen); 1532 if ((cp >= word) && 1533 (strncmp(cp, pattern->lhs, pattern->leftLen) == 0)) { 1534 /* 1535 * Match found. If we will place characters in the buffer, 1536 * add a space before hand as indicated by addSpace, then 1537 * stuff in the initial, unmatched part of the word followed 1538 * by the right-hand-side. 1539 */ 1540 if (((cp - word) + pattern->rightLen) != 0) { 1541 if (addSpace && vpstate->varSpace) { 1542 Buf_AddByte(buf, vpstate->varSpace); 1543 } 1544 addSpace = TRUE; 1545 } 1546 Buf_AddBytes(buf, cp - word, word); 1547 Buf_AddBytes(buf, pattern->rightLen, pattern->rhs); 1548 pattern->flags |= VAR_SUB_MATCHED; 1549 } else { 1550 /* 1551 * Had to match at end and didn't. Copy entire word. 1552 */ 1553 goto nosub; 1554 } 1555 } else { 1556 /* 1557 * Pattern is unanchored: search for the pattern in the word using 1558 * String_FindSubstring, copying unmatched portions and the 1559 * right-hand-side for each match found, handling non-global 1560 * substitutions correctly, etc. When the loop is done, any 1561 * remaining part of the word (word and wordLen are adjusted 1562 * accordingly through the loop) is copied straight into the 1563 * buffer. 1564 * addSpace is set FALSE as soon as a space is added to the 1565 * buffer. 1566 */ 1567 Boolean done; 1568 int origSize; 1569 1570 done = FALSE; 1571 origSize = Buf_Size(buf); 1572 while (!done) { 1573 cp = Str_FindSubstring(word, pattern->lhs); 1574 if (cp != NULL) { 1575 if (addSpace && (((cp - word) + pattern->rightLen) != 0)){ 1576 Buf_AddByte(buf, vpstate->varSpace); 1577 addSpace = FALSE; 1578 } 1579 Buf_AddBytes(buf, cp-word, word); 1580 Buf_AddBytes(buf, pattern->rightLen, pattern->rhs); 1581 wordLen -= (cp - word) + pattern->leftLen; 1582 word = cp + pattern->leftLen; 1583 if (wordLen == 0) { 1584 done = TRUE; 1585 } 1586 if ((pattern->flags & VAR_SUB_GLOBAL) == 0) { 1587 done = TRUE; 1588 } 1589 pattern->flags |= VAR_SUB_MATCHED; 1590 } else { 1591 done = TRUE; 1592 } 1593 } 1594 if (wordLen != 0) { 1595 if (addSpace && vpstate->varSpace) { 1596 Buf_AddByte(buf, vpstate->varSpace); 1597 } 1598 Buf_AddBytes(buf, wordLen, word); 1599 } 1600 /* 1601 * If added characters to the buffer, need to add a space 1602 * before we add any more. If we didn't add any, just return 1603 * the previous value of addSpace. 1604 */ 1605 return ((Buf_Size(buf) != origSize) || addSpace); 1606 } 1607 return (addSpace); 1608 } 1609 nosub: 1610 if (addSpace && vpstate->varSpace) { 1611 Buf_AddByte(buf, vpstate->varSpace); 1612 } 1613 Buf_AddBytes(buf, wordLen, word); 1614 return(TRUE); 1615 } 1616 1617 #ifndef NO_REGEX 1618 /*- 1619 *----------------------------------------------------------------------- 1620 * VarREError -- 1621 * Print the error caused by a regcomp or regexec call. 1622 * 1623 * Results: 1624 * None. 1625 * 1626 * Side Effects: 1627 * An error gets printed. 1628 * 1629 *----------------------------------------------------------------------- 1630 */ 1631 static void 1632 VarREError(int errnum, regex_t *pat, const char *str) 1633 { 1634 char *errbuf; 1635 int errlen; 1636 1637 errlen = regerror(errnum, pat, 0, 0); 1638 errbuf = bmake_malloc(errlen); 1639 regerror(errnum, pat, errbuf, errlen); 1640 Error("%s: %s", str, errbuf); 1641 free(errbuf); 1642 } 1643 1644 1645 /*- 1646 *----------------------------------------------------------------------- 1647 * VarRESubstitute -- 1648 * Perform a regex substitution on the given word, placing the 1649 * result in the passed buffer. 1650 * 1651 * Results: 1652 * TRUE if a space is needed before more characters are added. 1653 * 1654 * Side Effects: 1655 * None. 1656 * 1657 *----------------------------------------------------------------------- 1658 */ 1659 static Boolean 1660 VarRESubstitute(GNode *ctx MAKE_ATTR_UNUSED, 1661 Var_Parse_State *vpstate MAKE_ATTR_UNUSED, 1662 char *word, Boolean addSpace, Buffer *buf, 1663 void *patternp) 1664 { 1665 VarREPattern *pat; 1666 int xrv; 1667 char *wp; 1668 char *rp; 1669 int added; 1670 int flags = 0; 1671 1672 #define MAYBE_ADD_SPACE() \ 1673 if (addSpace && !added) \ 1674 Buf_AddByte(buf, ' '); \ 1675 added = 1 1676 1677 added = 0; 1678 wp = word; 1679 pat = patternp; 1680 1681 if ((pat->flags & (VAR_SUB_ONE|VAR_SUB_MATCHED)) == 1682 (VAR_SUB_ONE|VAR_SUB_MATCHED)) 1683 xrv = REG_NOMATCH; 1684 else { 1685 tryagain: 1686 xrv = regexec(&pat->re, wp, pat->nsub, pat->matches, flags); 1687 } 1688 1689 switch (xrv) { 1690 case 0: 1691 pat->flags |= VAR_SUB_MATCHED; 1692 if (pat->matches[0].rm_so > 0) { 1693 MAYBE_ADD_SPACE(); 1694 Buf_AddBytes(buf, pat->matches[0].rm_so, wp); 1695 } 1696 1697 for (rp = pat->replace; *rp; rp++) { 1698 if ((*rp == '\\') && ((rp[1] == '&') || (rp[1] == '\\'))) { 1699 MAYBE_ADD_SPACE(); 1700 Buf_AddByte(buf,rp[1]); 1701 rp++; 1702 } 1703 else if ((*rp == '&') || 1704 ((*rp == '\\') && isdigit((unsigned char)rp[1]))) { 1705 int n; 1706 const char *subbuf; 1707 int sublen; 1708 char errstr[3]; 1709 1710 if (*rp == '&') { 1711 n = 0; 1712 errstr[0] = '&'; 1713 errstr[1] = '\0'; 1714 } else { 1715 n = rp[1] - '0'; 1716 errstr[0] = '\\'; 1717 errstr[1] = rp[1]; 1718 errstr[2] = '\0'; 1719 rp++; 1720 } 1721 1722 if (n > pat->nsub) { 1723 Error("No subexpression %s", &errstr[0]); 1724 subbuf = ""; 1725 sublen = 0; 1726 } else if ((pat->matches[n].rm_so == -1) && 1727 (pat->matches[n].rm_eo == -1)) { 1728 Error("No match for subexpression %s", &errstr[0]); 1729 subbuf = ""; 1730 sublen = 0; 1731 } else { 1732 subbuf = wp + pat->matches[n].rm_so; 1733 sublen = pat->matches[n].rm_eo - pat->matches[n].rm_so; 1734 } 1735 1736 if (sublen > 0) { 1737 MAYBE_ADD_SPACE(); 1738 Buf_AddBytes(buf, sublen, subbuf); 1739 } 1740 } else { 1741 MAYBE_ADD_SPACE(); 1742 Buf_AddByte(buf, *rp); 1743 } 1744 } 1745 wp += pat->matches[0].rm_eo; 1746 if (pat->flags & VAR_SUB_GLOBAL) { 1747 flags |= REG_NOTBOL; 1748 if (pat->matches[0].rm_so == 0 && pat->matches[0].rm_eo == 0) { 1749 MAYBE_ADD_SPACE(); 1750 Buf_AddByte(buf, *wp); 1751 wp++; 1752 1753 } 1754 if (*wp) 1755 goto tryagain; 1756 } 1757 if (*wp) { 1758 MAYBE_ADD_SPACE(); 1759 Buf_AddBytes(buf, strlen(wp), wp); 1760 } 1761 break; 1762 default: 1763 VarREError(xrv, &pat->re, "Unexpected regex error"); 1764 /* fall through */ 1765 case REG_NOMATCH: 1766 if (*wp) { 1767 MAYBE_ADD_SPACE(); 1768 Buf_AddBytes(buf,strlen(wp),wp); 1769 } 1770 break; 1771 } 1772 return(addSpace||added); 1773 } 1774 #endif 1775 1776 1777 1778 /*- 1779 *----------------------------------------------------------------------- 1780 * VarLoopExpand -- 1781 * Implements the :@<temp>@<string>@ modifier of ODE make. 1782 * We set the temp variable named in pattern.lhs to word and expand 1783 * pattern.rhs storing the result in the passed buffer. 1784 * 1785 * Input: 1786 * word Word to modify 1787 * addSpace True if space should be added before 1788 * other characters 1789 * buf Buffer for result 1790 * pattern Datafor substitution 1791 * 1792 * Results: 1793 * TRUE if a space is needed before more characters are added. 1794 * 1795 * Side Effects: 1796 * None. 1797 * 1798 *----------------------------------------------------------------------- 1799 */ 1800 static Boolean 1801 VarLoopExpand(GNode *ctx MAKE_ATTR_UNUSED, 1802 Var_Parse_State *vpstate MAKE_ATTR_UNUSED, 1803 char *word, Boolean addSpace, Buffer *buf, 1804 void *loopp) 1805 { 1806 VarLoop_t *loop = (VarLoop_t *)loopp; 1807 char *s; 1808 int slen; 1809 1810 if (word && *word) { 1811 Var_Set(loop->tvar, word, loop->ctxt, VAR_NO_EXPORT); 1812 s = Var_Subst(NULL, loop->str, loop->ctxt, loop->errnum); 1813 if (s != NULL && *s != '\0') { 1814 if (addSpace && *s != '\n') 1815 Buf_AddByte(buf, ' '); 1816 Buf_AddBytes(buf, (slen = strlen(s)), s); 1817 addSpace = (slen > 0 && s[slen - 1] != '\n'); 1818 free(s); 1819 } 1820 } 1821 return addSpace; 1822 } 1823 1824 1825 /*- 1826 *----------------------------------------------------------------------- 1827 * VarSelectWords -- 1828 * Implements the :[start..end] modifier. 1829 * This is a special case of VarModify since we want to be able 1830 * to scan the list backwards if start > end. 1831 * 1832 * Input: 1833 * str String whose words should be trimmed 1834 * seldata words to select 1835 * 1836 * Results: 1837 * A string of all the words selected. 1838 * 1839 * Side Effects: 1840 * None. 1841 * 1842 *----------------------------------------------------------------------- 1843 */ 1844 static char * 1845 VarSelectWords(GNode *ctx MAKE_ATTR_UNUSED, Var_Parse_State *vpstate, 1846 const char *str, VarSelectWords_t *seldata) 1847 { 1848 Buffer buf; /* Buffer for the new string */ 1849 Boolean addSpace; /* TRUE if need to add a space to the 1850 * buffer before adding the trimmed 1851 * word */ 1852 char **av; /* word list */ 1853 char *as; /* word list memory */ 1854 int ac, i; 1855 int start, end, step; 1856 1857 Buf_Init(&buf, 0); 1858 addSpace = FALSE; 1859 1860 if (vpstate->oneBigWord) { 1861 /* fake what brk_string() would do if there were only one word */ 1862 ac = 1; 1863 av = bmake_malloc((ac + 1) * sizeof(char *)); 1864 as = bmake_strdup(str); 1865 av[0] = as; 1866 av[1] = NULL; 1867 } else { 1868 av = brk_string(str, &ac, FALSE, &as); 1869 } 1870 1871 /* 1872 * Now sanitize seldata. 1873 * If seldata->start or seldata->end are negative, convert them to 1874 * the positive equivalents (-1 gets converted to argc, -2 gets 1875 * converted to (argc-1), etc.). 1876 */ 1877 if (seldata->start < 0) 1878 seldata->start = ac + seldata->start + 1; 1879 if (seldata->end < 0) 1880 seldata->end = ac + seldata->end + 1; 1881 1882 /* 1883 * We avoid scanning more of the list than we need to. 1884 */ 1885 if (seldata->start > seldata->end) { 1886 start = MIN(ac, seldata->start) - 1; 1887 end = MAX(0, seldata->end - 1); 1888 step = -1; 1889 } else { 1890 start = MAX(0, seldata->start - 1); 1891 end = MIN(ac, seldata->end); 1892 step = 1; 1893 } 1894 1895 for (i = start; 1896 (step < 0 && i >= end) || (step > 0 && i < end); 1897 i += step) { 1898 if (av[i] && *av[i]) { 1899 if (addSpace && vpstate->varSpace) { 1900 Buf_AddByte(&buf, vpstate->varSpace); 1901 } 1902 Buf_AddBytes(&buf, strlen(av[i]), av[i]); 1903 addSpace = TRUE; 1904 } 1905 } 1906 1907 free(as); 1908 free(av); 1909 1910 return Buf_Destroy(&buf, FALSE); 1911 } 1912 1913 1914 /*- 1915 * VarRealpath -- 1916 * Replace each word with the result of realpath() 1917 * if successful. 1918 */ 1919 static Boolean 1920 VarRealpath(GNode *ctx MAKE_ATTR_UNUSED, Var_Parse_State *vpstate, 1921 char *word, Boolean addSpace, Buffer *buf, 1922 void *patternp MAKE_ATTR_UNUSED) 1923 { 1924 struct stat st; 1925 char rbuf[MAXPATHLEN]; 1926 char *rp; 1927 1928 if (addSpace && vpstate->varSpace) { 1929 Buf_AddByte(buf, vpstate->varSpace); 1930 } 1931 addSpace = TRUE; 1932 rp = realpath(word, rbuf); 1933 if (rp && *rp == '/' && stat(rp, &st) == 0) 1934 word = rp; 1935 1936 Buf_AddBytes(buf, strlen(word), word); 1937 return(addSpace); 1938 } 1939 1940 /*- 1941 *----------------------------------------------------------------------- 1942 * VarModify -- 1943 * Modify each of the words of the passed string using the given 1944 * function. Used to implement all modifiers. 1945 * 1946 * Input: 1947 * str String whose words should be trimmed 1948 * modProc Function to use to modify them 1949 * datum Datum to pass it 1950 * 1951 * Results: 1952 * A string of all the words modified appropriately. 1953 * 1954 * Side Effects: 1955 * None. 1956 * 1957 *----------------------------------------------------------------------- 1958 */ 1959 static char * 1960 VarModify(GNode *ctx, Var_Parse_State *vpstate, 1961 const char *str, 1962 Boolean (*modProc)(GNode *, Var_Parse_State *, char *, 1963 Boolean, Buffer *, void *), 1964 void *datum) 1965 { 1966 Buffer buf; /* Buffer for the new string */ 1967 Boolean addSpace; /* TRUE if need to add a space to the 1968 * buffer before adding the trimmed 1969 * word */ 1970 char **av; /* word list */ 1971 char *as; /* word list memory */ 1972 int ac, i; 1973 1974 Buf_Init(&buf, 0); 1975 addSpace = FALSE; 1976 1977 if (vpstate->oneBigWord) { 1978 /* fake what brk_string() would do if there were only one word */ 1979 ac = 1; 1980 av = bmake_malloc((ac + 1) * sizeof(char *)); 1981 as = bmake_strdup(str); 1982 av[0] = as; 1983 av[1] = NULL; 1984 } else { 1985 av = brk_string(str, &ac, FALSE, &as); 1986 } 1987 1988 for (i = 0; i < ac; i++) { 1989 addSpace = (*modProc)(ctx, vpstate, av[i], addSpace, &buf, datum); 1990 } 1991 1992 free(as); 1993 free(av); 1994 1995 return Buf_Destroy(&buf, FALSE); 1996 } 1997 1998 1999 static int 2000 VarWordCompare(const void *a, const void *b) 2001 { 2002 int r = strcmp(*(const char * const *)a, *(const char * const *)b); 2003 return r; 2004 } 2005 2006 /*- 2007 *----------------------------------------------------------------------- 2008 * VarOrder -- 2009 * Order the words in the string. 2010 * 2011 * Input: 2012 * str String whose words should be sorted. 2013 * otype How to order: s - sort, x - random. 2014 * 2015 * Results: 2016 * A string containing the words ordered. 2017 * 2018 * Side Effects: 2019 * None. 2020 * 2021 *----------------------------------------------------------------------- 2022 */ 2023 static char * 2024 VarOrder(const char *str, const char otype) 2025 { 2026 Buffer buf; /* Buffer for the new string */ 2027 char **av; /* word list [first word does not count] */ 2028 char *as; /* word list memory */ 2029 int ac, i; 2030 2031 Buf_Init(&buf, 0); 2032 2033 av = brk_string(str, &ac, FALSE, &as); 2034 2035 if (ac > 0) 2036 switch (otype) { 2037 case 's': /* sort alphabetically */ 2038 qsort(av, ac, sizeof(char *), VarWordCompare); 2039 break; 2040 case 'x': /* randomize */ 2041 { 2042 int rndidx; 2043 char *t; 2044 2045 /* 2046 * We will use [ac..2] range for mod factors. This will produce 2047 * random numbers in [(ac-1)..0] interval, and minimal 2048 * reasonable value for mod factor is 2 (the mod 1 will produce 2049 * 0 with probability 1). 2050 */ 2051 for (i = ac-1; i > 0; i--) { 2052 rndidx = random() % (i + 1); 2053 if (i != rndidx) { 2054 t = av[i]; 2055 av[i] = av[rndidx]; 2056 av[rndidx] = t; 2057 } 2058 } 2059 } 2060 } /* end of switch */ 2061 2062 for (i = 0; i < ac; i++) { 2063 Buf_AddBytes(&buf, strlen(av[i]), av[i]); 2064 if (i != ac - 1) 2065 Buf_AddByte(&buf, ' '); 2066 } 2067 2068 free(as); 2069 free(av); 2070 2071 return Buf_Destroy(&buf, FALSE); 2072 } 2073 2074 2075 /*- 2076 *----------------------------------------------------------------------- 2077 * VarUniq -- 2078 * Remove adjacent duplicate words. 2079 * 2080 * Input: 2081 * str String whose words should be sorted 2082 * 2083 * Results: 2084 * A string containing the resulting words. 2085 * 2086 * Side Effects: 2087 * None. 2088 * 2089 *----------------------------------------------------------------------- 2090 */ 2091 static char * 2092 VarUniq(const char *str) 2093 { 2094 Buffer buf; /* Buffer for new string */ 2095 char **av; /* List of words to affect */ 2096 char *as; /* Word list memory */ 2097 int ac, i, j; 2098 2099 Buf_Init(&buf, 0); 2100 av = brk_string(str, &ac, FALSE, &as); 2101 2102 if (ac > 1) { 2103 for (j = 0, i = 1; i < ac; i++) 2104 if (strcmp(av[i], av[j]) != 0 && (++j != i)) 2105 av[j] = av[i]; 2106 ac = j + 1; 2107 } 2108 2109 for (i = 0; i < ac; i++) { 2110 Buf_AddBytes(&buf, strlen(av[i]), av[i]); 2111 if (i != ac - 1) 2112 Buf_AddByte(&buf, ' '); 2113 } 2114 2115 free(as); 2116 free(av); 2117 2118 return Buf_Destroy(&buf, FALSE); 2119 } 2120 2121 2122 /*- 2123 *----------------------------------------------------------------------- 2124 * VarGetPattern -- 2125 * Pass through the tstr looking for 1) escaped delimiters, 2126 * '$'s and backslashes (place the escaped character in 2127 * uninterpreted) and 2) unescaped $'s that aren't before 2128 * the delimiter (expand the variable substitution unless flags 2129 * has VAR_NOSUBST set). 2130 * Return the expanded string or NULL if the delimiter was missing 2131 * If pattern is specified, handle escaped ampersands, and replace 2132 * unescaped ampersands with the lhs of the pattern. 2133 * 2134 * Results: 2135 * A string of all the words modified appropriately. 2136 * If length is specified, return the string length of the buffer 2137 * If flags is specified and the last character of the pattern is a 2138 * $ set the VAR_MATCH_END bit of flags. 2139 * 2140 * Side Effects: 2141 * None. 2142 *----------------------------------------------------------------------- 2143 */ 2144 static char * 2145 VarGetPattern(GNode *ctxt, Var_Parse_State *vpstate MAKE_ATTR_UNUSED, 2146 int errnum, const char **tstr, int delim, int *flags, 2147 int *length, VarPattern *pattern) 2148 { 2149 const char *cp; 2150 char *rstr; 2151 Buffer buf; 2152 int junk; 2153 2154 Buf_Init(&buf, 0); 2155 if (length == NULL) 2156 length = &junk; 2157 2158 #define IS_A_MATCH(cp, delim) \ 2159 ((cp[0] == '\\') && ((cp[1] == delim) || \ 2160 (cp[1] == '\\') || (cp[1] == '$') || (pattern && (cp[1] == '&')))) 2161 2162 /* 2163 * Skim through until the matching delimiter is found; 2164 * pick up variable substitutions on the way. Also allow 2165 * backslashes to quote the delimiter, $, and \, but don't 2166 * touch other backslashes. 2167 */ 2168 for (cp = *tstr; *cp && (*cp != delim); cp++) { 2169 if (IS_A_MATCH(cp, delim)) { 2170 Buf_AddByte(&buf, cp[1]); 2171 cp++; 2172 } else if (*cp == '$') { 2173 if (cp[1] == delim) { 2174 if (flags == NULL) 2175 Buf_AddByte(&buf, *cp); 2176 else 2177 /* 2178 * Unescaped $ at end of pattern => anchor 2179 * pattern at end. 2180 */ 2181 *flags |= VAR_MATCH_END; 2182 } else { 2183 if (flags == NULL || (*flags & VAR_NOSUBST) == 0) { 2184 char *cp2; 2185 int len; 2186 void *freeIt; 2187 2188 /* 2189 * If unescaped dollar sign not before the 2190 * delimiter, assume it's a variable 2191 * substitution and recurse. 2192 */ 2193 cp2 = Var_Parse(cp, ctxt, errnum, &len, &freeIt); 2194 Buf_AddBytes(&buf, strlen(cp2), cp2); 2195 if (freeIt) 2196 free(freeIt); 2197 cp += len - 1; 2198 } else { 2199 const char *cp2 = &cp[1]; 2200 2201 if (*cp2 == PROPEN || *cp2 == BROPEN) { 2202 /* 2203 * Find the end of this variable reference 2204 * and suck it in without further ado. 2205 * It will be interperated later. 2206 */ 2207 int have = *cp2; 2208 int want = (*cp2 == PROPEN) ? PRCLOSE : BRCLOSE; 2209 int depth = 1; 2210 2211 for (++cp2; *cp2 != '\0' && depth > 0; ++cp2) { 2212 if (cp2[-1] != '\\') { 2213 if (*cp2 == have) 2214 ++depth; 2215 if (*cp2 == want) 2216 --depth; 2217 } 2218 } 2219 Buf_AddBytes(&buf, cp2 - cp, cp); 2220 cp = --cp2; 2221 } else 2222 Buf_AddByte(&buf, *cp); 2223 } 2224 } 2225 } 2226 else if (pattern && *cp == '&') 2227 Buf_AddBytes(&buf, pattern->leftLen, pattern->lhs); 2228 else 2229 Buf_AddByte(&buf, *cp); 2230 } 2231 2232 if (*cp != delim) { 2233 *tstr = cp; 2234 *length = 0; 2235 return NULL; 2236 } 2237 2238 *tstr = ++cp; 2239 *length = Buf_Size(&buf); 2240 rstr = Buf_Destroy(&buf, FALSE); 2241 if (DEBUG(VAR)) 2242 fprintf(debug_file, "Modifier pattern: \"%s\"\n", rstr); 2243 return rstr; 2244 } 2245 2246 /*- 2247 *----------------------------------------------------------------------- 2248 * VarQuote -- 2249 * Quote shell meta-characters in the string 2250 * 2251 * Results: 2252 * The quoted string 2253 * 2254 * Side Effects: 2255 * None. 2256 * 2257 *----------------------------------------------------------------------- 2258 */ 2259 static char * 2260 VarQuote(char *str) 2261 { 2262 2263 Buffer buf; 2264 /* This should cover most shells :-( */ 2265 static const char meta[] = "\n \t'`\";&<>()|*?{}[]\\$!#^~"; 2266 const char *newline; 2267 size_t len, nlen; 2268 2269 if ((newline = Shell_GetNewline()) == NULL) 2270 newline = "\\\n"; 2271 nlen = strlen(newline); 2272 2273 Buf_Init(&buf, 0); 2274 while (*str != '\0') { 2275 if ((len = strcspn(str, meta)) != 0) { 2276 Buf_AddBytes(&buf, len, str); 2277 str += len; 2278 } else if (*str == '\n') { 2279 Buf_AddBytes(&buf, nlen, newline); 2280 ++str; 2281 } else { 2282 Buf_AddByte(&buf, '\\'); 2283 Buf_AddByte(&buf, *str); 2284 ++str; 2285 } 2286 } 2287 str = Buf_Destroy(&buf, FALSE); 2288 if (DEBUG(VAR)) 2289 fprintf(debug_file, "QuoteMeta: [%s]\n", str); 2290 return str; 2291 } 2292 2293 /*- 2294 *----------------------------------------------------------------------- 2295 * VarHash -- 2296 * Hash the string using the MurmurHash3 algorithm. 2297 * Output is computed using 32bit Little Endian arithmetic. 2298 * 2299 * Input: 2300 * str String to modify 2301 * 2302 * Results: 2303 * Hash value of str, encoded as 8 hex digits. 2304 * 2305 * Side Effects: 2306 * None. 2307 * 2308 *----------------------------------------------------------------------- 2309 */ 2310 static char * 2311 VarHash(char *str) 2312 { 2313 static const char hexdigits[16] = "0123456789abcdef"; 2314 Buffer buf; 2315 size_t len, len2; 2316 unsigned char *ustr = (unsigned char *)str; 2317 uint32_t h, k, c1, c2; 2318 2319 h = 0x971e137bU; 2320 c1 = 0x95543787U; 2321 c2 = 0x2ad7eb25U; 2322 len2 = strlen(str); 2323 2324 for (len = len2; len; ) { 2325 k = 0; 2326 switch (len) { 2327 default: 2328 k = (ustr[3] << 24) | (ustr[2] << 16) | (ustr[1] << 8) | ustr[0]; 2329 len -= 4; 2330 ustr += 4; 2331 break; 2332 case 3: 2333 k |= (ustr[2] << 16); 2334 case 2: 2335 k |= (ustr[1] << 8); 2336 case 1: 2337 k |= ustr[0]; 2338 len = 0; 2339 } 2340 c1 = c1 * 5 + 0x7b7d159cU; 2341 c2 = c2 * 5 + 0x6bce6396U; 2342 k *= c1; 2343 k = (k << 11) ^ (k >> 21); 2344 k *= c2; 2345 h = (h << 13) ^ (h >> 19); 2346 h = h * 5 + 0x52dce729U; 2347 h ^= k; 2348 } 2349 h ^= len2; 2350 h *= 0x85ebca6b; 2351 h ^= h >> 13; 2352 h *= 0xc2b2ae35; 2353 h ^= h >> 16; 2354 2355 Buf_Init(&buf, 0); 2356 for (len = 0; len < 8; ++len) { 2357 Buf_AddByte(&buf, hexdigits[h & 15]); 2358 h >>= 4; 2359 } 2360 2361 return Buf_Destroy(&buf, FALSE); 2362 } 2363 2364 static char * 2365 VarStrftime(const char *fmt, int zulu) 2366 { 2367 char buf[BUFSIZ]; 2368 time_t utc; 2369 2370 time(&utc); 2371 if (!*fmt) 2372 fmt = "%c"; 2373 strftime(buf, sizeof(buf), fmt, zulu ? gmtime(&utc) : localtime(&utc)); 2374 2375 buf[sizeof(buf) - 1] = '\0'; 2376 return bmake_strdup(buf); 2377 } 2378 2379 /* 2380 * Now we need to apply any modifiers the user wants applied. 2381 * These are: 2382 * :M<pattern> words which match the given <pattern>. 2383 * <pattern> is of the standard file 2384 * wildcarding form. 2385 * :N<pattern> words which do not match the given <pattern>. 2386 * :S<d><pat1><d><pat2><d>[1gW] 2387 * Substitute <pat2> for <pat1> in the value 2388 * :C<d><pat1><d><pat2><d>[1gW] 2389 * Substitute <pat2> for regex <pat1> in the value 2390 * :H Substitute the head of each word 2391 * :T Substitute the tail of each word 2392 * :E Substitute the extension (minus '.') of 2393 * each word 2394 * :R Substitute the root of each word 2395 * (pathname minus the suffix). 2396 * :O ("Order") Alphabeticaly sort words in variable. 2397 * :Ox ("intermiX") Randomize words in variable. 2398 * :u ("uniq") Remove adjacent duplicate words. 2399 * :tu Converts the variable contents to uppercase. 2400 * :tl Converts the variable contents to lowercase. 2401 * :ts[c] Sets varSpace - the char used to 2402 * separate words to 'c'. If 'c' is 2403 * omitted then no separation is used. 2404 * :tW Treat the variable contents as a single 2405 * word, even if it contains spaces. 2406 * (Mnemonic: one big 'W'ord.) 2407 * :tw Treat the variable contents as multiple 2408 * space-separated words. 2409 * (Mnemonic: many small 'w'ords.) 2410 * :[index] Select a single word from the value. 2411 * :[start..end] Select multiple words from the value. 2412 * :[*] or :[0] Select the entire value, as a single 2413 * word. Equivalent to :tW. 2414 * :[@] Select the entire value, as multiple 2415 * words. Undoes the effect of :[*]. 2416 * Equivalent to :tw. 2417 * :[#] Returns the number of words in the value. 2418 * 2419 * :?<true-value>:<false-value> 2420 * If the variable evaluates to true, return 2421 * true value, else return the second value. 2422 * :lhs=rhs Like :S, but the rhs goes to the end of 2423 * the invocation. 2424 * :sh Treat the current value as a command 2425 * to be run, new value is its output. 2426 * The following added so we can handle ODE makefiles. 2427 * :@<tmpvar>@<newval>@ 2428 * Assign a temporary local variable <tmpvar> 2429 * to the current value of each word in turn 2430 * and replace each word with the result of 2431 * evaluating <newval> 2432 * :D<newval> Use <newval> as value if variable defined 2433 * :U<newval> Use <newval> as value if variable undefined 2434 * :L Use the name of the variable as the value. 2435 * :P Use the path of the node that has the same 2436 * name as the variable as the value. This 2437 * basically includes an implied :L so that 2438 * the common method of refering to the path 2439 * of your dependent 'x' in a rule is to use 2440 * the form '${x:P}'. 2441 * :!<cmd>! Run cmd much the same as :sh run's the 2442 * current value of the variable. 2443 * The ::= modifiers, actually assign a value to the variable. 2444 * Their main purpose is in supporting modifiers of .for loop 2445 * iterators and other obscure uses. They always expand to 2446 * nothing. In a target rule that would otherwise expand to an 2447 * empty line they can be preceded with @: to keep make happy. 2448 * Eg. 2449 * 2450 * foo: .USE 2451 * .for i in ${.TARGET} ${.TARGET:R}.gz 2452 * @: ${t::=$i} 2453 * @echo blah ${t:T} 2454 * .endfor 2455 * 2456 * ::=<str> Assigns <str> as the new value of variable. 2457 * ::?=<str> Assigns <str> as value of variable if 2458 * it was not already set. 2459 * ::+=<str> Appends <str> to variable. 2460 * ::!=<cmd> Assigns output of <cmd> as the new value of 2461 * variable. 2462 */ 2463 2464 /* we now have some modifiers with long names */ 2465 #define STRMOD_MATCH(s, want, n) \ 2466 (strncmp(s, want, n) == 0 && (s[n] == endc || s[n] == ':')) 2467 2468 static char * 2469 ApplyModifiers(char *nstr, const char *tstr, 2470 int startc, int endc, 2471 Var *v, GNode *ctxt, Boolean errnum, 2472 int *lengthPtr, void **freePtr) 2473 { 2474 const char *start; 2475 const char *cp; /* Secondary pointer into str (place marker 2476 * for tstr) */ 2477 char *newStr; /* New value to return */ 2478 char termc; /* Character which terminated scan */ 2479 int cnt; /* Used to count brace pairs when variable in 2480 * in parens or braces */ 2481 char delim; 2482 int modifier; /* that we are processing */ 2483 Var_Parse_State parsestate; /* Flags passed to helper functions */ 2484 2485 delim = '\0'; 2486 parsestate.oneBigWord = FALSE; 2487 parsestate.varSpace = ' '; /* word separator */ 2488 2489 start = cp = tstr; 2490 2491 while (*tstr && *tstr != endc) { 2492 2493 if (*tstr == '$') { 2494 /* 2495 * We may have some complex modifiers in a variable. 2496 */ 2497 void *freeIt; 2498 char *rval; 2499 int rlen; 2500 int c; 2501 2502 rval = Var_Parse(tstr, ctxt, errnum, &rlen, &freeIt); 2503 2504 /* 2505 * If we have not parsed up to endc or ':', 2506 * we are not interested. 2507 */ 2508 if (rval != NULL && *rval && 2509 (c = tstr[rlen]) != '\0' && 2510 c != ':' && 2511 c != endc) { 2512 if (freeIt) 2513 free(freeIt); 2514 goto apply_mods; 2515 } 2516 2517 if (DEBUG(VAR)) { 2518 fprintf(debug_file, "Got '%s' from '%.*s'%.*s\n", 2519 rval, rlen, tstr, rlen, tstr + rlen); 2520 } 2521 2522 tstr += rlen; 2523 2524 if (rval != NULL && *rval) { 2525 int used; 2526 2527 nstr = ApplyModifiers(nstr, rval, 2528 0, 0, 2529 v, ctxt, errnum, &used, freePtr); 2530 if (nstr == var_Error 2531 || (nstr == varNoError && errnum == 0) 2532 || strlen(rval) != (size_t) used) { 2533 if (freeIt) 2534 free(freeIt); 2535 goto out; /* error already reported */ 2536 } 2537 } 2538 if (freeIt) 2539 free(freeIt); 2540 if (*tstr == ':') 2541 tstr++; 2542 else if (!*tstr && endc) { 2543 Error("Unclosed variable specification after complex modifier (expecting '%c') for %s", endc, v->name); 2544 goto out; 2545 } 2546 continue; 2547 } 2548 apply_mods: 2549 if (DEBUG(VAR)) { 2550 fprintf(debug_file, "Applying[%s] :%c to \"%s\"\n", v->name, 2551 *tstr, nstr); 2552 } 2553 newStr = var_Error; 2554 switch ((modifier = *tstr)) { 2555 case ':': 2556 { 2557 if (tstr[1] == '=' || 2558 (tstr[2] == '=' && 2559 (tstr[1] == '!' || tstr[1] == '+' || tstr[1] == '?'))) { 2560 /* 2561 * "::=", "::!=", "::+=", or "::?=" 2562 */ 2563 GNode *v_ctxt; /* context where v belongs */ 2564 const char *emsg; 2565 char *sv_name; 2566 VarPattern pattern; 2567 int how; 2568 2569 if (v->name[0] == 0) 2570 goto bad_modifier; 2571 2572 v_ctxt = ctxt; 2573 sv_name = NULL; 2574 ++tstr; 2575 if (v->flags & VAR_JUNK) { 2576 /* 2577 * We need to bmake_strdup() it incase 2578 * VarGetPattern() recurses. 2579 */ 2580 sv_name = v->name; 2581 v->name = bmake_strdup(v->name); 2582 } else if (ctxt != VAR_GLOBAL) { 2583 Var *gv = VarFind(v->name, ctxt, 0); 2584 if (gv == NULL) 2585 v_ctxt = VAR_GLOBAL; 2586 else 2587 VarFreeEnv(gv, TRUE); 2588 } 2589 2590 switch ((how = *tstr)) { 2591 case '+': 2592 case '?': 2593 case '!': 2594 cp = &tstr[2]; 2595 break; 2596 default: 2597 cp = ++tstr; 2598 break; 2599 } 2600 delim = startc == PROPEN ? PRCLOSE : BRCLOSE; 2601 pattern.flags = 0; 2602 2603 pattern.rhs = VarGetPattern(ctxt, &parsestate, errnum, 2604 &cp, delim, NULL, 2605 &pattern.rightLen, 2606 NULL); 2607 if (v->flags & VAR_JUNK) { 2608 /* restore original name */ 2609 free(v->name); 2610 v->name = sv_name; 2611 } 2612 if (pattern.rhs == NULL) 2613 goto cleanup; 2614 2615 termc = *--cp; 2616 delim = '\0'; 2617 2618 switch (how) { 2619 case '+': 2620 Var_Append(v->name, pattern.rhs, v_ctxt); 2621 break; 2622 case '!': 2623 newStr = Cmd_Exec(pattern.rhs, &emsg); 2624 if (emsg) 2625 Error(emsg, nstr); 2626 else 2627 Var_Set(v->name, newStr, v_ctxt, 0); 2628 if (newStr) 2629 free(newStr); 2630 break; 2631 case '?': 2632 if ((v->flags & VAR_JUNK) == 0) 2633 break; 2634 /* FALLTHROUGH */ 2635 default: 2636 Var_Set(v->name, pattern.rhs, v_ctxt, 0); 2637 break; 2638 } 2639 free(UNCONST(pattern.rhs)); 2640 newStr = varNoError; 2641 break; 2642 } 2643 goto default_case; /* "::<unrecognised>" */ 2644 } 2645 case '@': 2646 { 2647 VarLoop_t loop; 2648 int flags = VAR_NOSUBST; 2649 2650 cp = ++tstr; 2651 delim = '@'; 2652 if ((loop.tvar = VarGetPattern(ctxt, &parsestate, errnum, 2653 &cp, delim, 2654 &flags, &loop.tvarLen, 2655 NULL)) == NULL) 2656 goto cleanup; 2657 2658 if ((loop.str = VarGetPattern(ctxt, &parsestate, errnum, 2659 &cp, delim, 2660 &flags, &loop.strLen, 2661 NULL)) == NULL) 2662 goto cleanup; 2663 2664 termc = *cp; 2665 delim = '\0'; 2666 2667 loop.errnum = errnum; 2668 loop.ctxt = ctxt; 2669 newStr = VarModify(ctxt, &parsestate, nstr, VarLoopExpand, 2670 &loop); 2671 free(loop.tvar); 2672 free(loop.str); 2673 break; 2674 } 2675 case 'D': 2676 case 'U': 2677 { 2678 Buffer buf; /* Buffer for patterns */ 2679 int wantit; /* want data in buffer */ 2680 2681 /* 2682 * Pass through tstr looking for 1) escaped delimiters, 2683 * '$'s and backslashes (place the escaped character in 2684 * uninterpreted) and 2) unescaped $'s that aren't before 2685 * the delimiter (expand the variable substitution). 2686 * The result is left in the Buffer buf. 2687 */ 2688 Buf_Init(&buf, 0); 2689 for (cp = tstr + 1; 2690 *cp != endc && *cp != ':' && *cp != '\0'; 2691 cp++) { 2692 if ((*cp == '\\') && 2693 ((cp[1] == ':') || 2694 (cp[1] == '$') || 2695 (cp[1] == endc) || 2696 (cp[1] == '\\'))) 2697 { 2698 Buf_AddByte(&buf, cp[1]); 2699 cp++; 2700 } else if (*cp == '$') { 2701 /* 2702 * If unescaped dollar sign, assume it's a 2703 * variable substitution and recurse. 2704 */ 2705 char *cp2; 2706 int len; 2707 void *freeIt; 2708 2709 cp2 = Var_Parse(cp, ctxt, errnum, &len, &freeIt); 2710 Buf_AddBytes(&buf, strlen(cp2), cp2); 2711 if (freeIt) 2712 free(freeIt); 2713 cp += len - 1; 2714 } else { 2715 Buf_AddByte(&buf, *cp); 2716 } 2717 } 2718 2719 termc = *cp; 2720 2721 if (*tstr == 'U') 2722 wantit = ((v->flags & VAR_JUNK) != 0); 2723 else 2724 wantit = ((v->flags & VAR_JUNK) == 0); 2725 if ((v->flags & VAR_JUNK) != 0) 2726 v->flags |= VAR_KEEP; 2727 if (wantit) { 2728 newStr = Buf_Destroy(&buf, FALSE); 2729 } else { 2730 newStr = nstr; 2731 Buf_Destroy(&buf, TRUE); 2732 } 2733 break; 2734 } 2735 case 'L': 2736 { 2737 if ((v->flags & VAR_JUNK) != 0) 2738 v->flags |= VAR_KEEP; 2739 newStr = bmake_strdup(v->name); 2740 cp = ++tstr; 2741 termc = *tstr; 2742 break; 2743 } 2744 case 'P': 2745 { 2746 GNode *gn; 2747 2748 if ((v->flags & VAR_JUNK) != 0) 2749 v->flags |= VAR_KEEP; 2750 gn = Targ_FindNode(v->name, TARG_NOCREATE); 2751 if (gn == NULL || gn->type & OP_NOPATH) { 2752 newStr = NULL; 2753 } else if (gn->path) { 2754 newStr = bmake_strdup(gn->path); 2755 } else { 2756 newStr = Dir_FindFile(v->name, Suff_FindPath(gn)); 2757 } 2758 if (!newStr) { 2759 newStr = bmake_strdup(v->name); 2760 } 2761 cp = ++tstr; 2762 termc = *tstr; 2763 break; 2764 } 2765 case '!': 2766 { 2767 const char *emsg; 2768 VarPattern pattern; 2769 pattern.flags = 0; 2770 2771 delim = '!'; 2772 2773 cp = ++tstr; 2774 if ((pattern.rhs = VarGetPattern(ctxt, &parsestate, errnum, 2775 &cp, delim, 2776 NULL, &pattern.rightLen, 2777 NULL)) == NULL) 2778 goto cleanup; 2779 newStr = Cmd_Exec(pattern.rhs, &emsg); 2780 free(UNCONST(pattern.rhs)); 2781 if (emsg) 2782 Error(emsg, nstr); 2783 termc = *cp; 2784 delim = '\0'; 2785 if (v->flags & VAR_JUNK) { 2786 v->flags |= VAR_KEEP; 2787 } 2788 break; 2789 } 2790 case '[': 2791 { 2792 /* 2793 * Look for the closing ']', recursively 2794 * expanding any embedded variables. 2795 * 2796 * estr is a pointer to the expanded result, 2797 * which we must free(). 2798 */ 2799 char *estr; 2800 2801 cp = tstr+1; /* point to char after '[' */ 2802 delim = ']'; /* look for closing ']' */ 2803 estr = VarGetPattern(ctxt, &parsestate, 2804 errnum, &cp, delim, 2805 NULL, NULL, NULL); 2806 if (estr == NULL) 2807 goto cleanup; /* report missing ']' */ 2808 /* now cp points just after the closing ']' */ 2809 delim = '\0'; 2810 if (cp[0] != ':' && cp[0] != endc) { 2811 /* Found junk after ']' */ 2812 free(estr); 2813 goto bad_modifier; 2814 } 2815 if (estr[0] == '\0') { 2816 /* Found empty square brackets in ":[]". */ 2817 free(estr); 2818 goto bad_modifier; 2819 } else if (estr[0] == '#' && estr[1] == '\0') { 2820 /* Found ":[#]" */ 2821 2822 /* 2823 * We will need enough space for the decimal 2824 * representation of an int. We calculate the 2825 * space needed for the octal representation, 2826 * and add enough slop to cope with a '-' sign 2827 * (which should never be needed) and a '\0' 2828 * string terminator. 2829 */ 2830 int newStrSize = 2831 (sizeof(int) * CHAR_BIT + 2) / 3 + 2; 2832 2833 newStr = bmake_malloc(newStrSize); 2834 if (parsestate.oneBigWord) { 2835 strncpy(newStr, "1", newStrSize); 2836 } else { 2837 /* XXX: brk_string() is a rather expensive 2838 * way of counting words. */ 2839 char **av; 2840 char *as; 2841 int ac; 2842 2843 av = brk_string(nstr, &ac, FALSE, &as); 2844 snprintf(newStr, newStrSize, "%d", ac); 2845 free(as); 2846 free(av); 2847 } 2848 termc = *cp; 2849 free(estr); 2850 break; 2851 } else if (estr[0] == '*' && estr[1] == '\0') { 2852 /* Found ":[*]" */ 2853 parsestate.oneBigWord = TRUE; 2854 newStr = nstr; 2855 termc = *cp; 2856 free(estr); 2857 break; 2858 } else if (estr[0] == '@' && estr[1] == '\0') { 2859 /* Found ":[@]" */ 2860 parsestate.oneBigWord = FALSE; 2861 newStr = nstr; 2862 termc = *cp; 2863 free(estr); 2864 break; 2865 } else { 2866 /* 2867 * We expect estr to contain a single 2868 * integer for :[N], or two integers 2869 * separated by ".." for :[start..end]. 2870 */ 2871 char *ep; 2872 2873 VarSelectWords_t seldata = { 0, 0 }; 2874 2875 seldata.start = strtol(estr, &ep, 0); 2876 if (ep == estr) { 2877 /* Found junk instead of a number */ 2878 free(estr); 2879 goto bad_modifier; 2880 } else if (ep[0] == '\0') { 2881 /* Found only one integer in :[N] */ 2882 seldata.end = seldata.start; 2883 } else if (ep[0] == '.' && ep[1] == '.' && 2884 ep[2] != '\0') { 2885 /* Expecting another integer after ".." */ 2886 ep += 2; 2887 seldata.end = strtol(ep, &ep, 0); 2888 if (ep[0] != '\0') { 2889 /* Found junk after ".." */ 2890 free(estr); 2891 goto bad_modifier; 2892 } 2893 } else { 2894 /* Found junk instead of ".." */ 2895 free(estr); 2896 goto bad_modifier; 2897 } 2898 /* 2899 * Now seldata is properly filled in, 2900 * but we still have to check for 0 as 2901 * a special case. 2902 */ 2903 if (seldata.start == 0 && seldata.end == 0) { 2904 /* ":[0]" or perhaps ":[0..0]" */ 2905 parsestate.oneBigWord = TRUE; 2906 newStr = nstr; 2907 termc = *cp; 2908 free(estr); 2909 break; 2910 } else if (seldata.start == 0 || 2911 seldata.end == 0) { 2912 /* ":[0..N]" or ":[N..0]" */ 2913 free(estr); 2914 goto bad_modifier; 2915 } 2916 /* 2917 * Normal case: select the words 2918 * described by seldata. 2919 */ 2920 newStr = VarSelectWords(ctxt, &parsestate, 2921 nstr, &seldata); 2922 2923 termc = *cp; 2924 free(estr); 2925 break; 2926 } 2927 2928 } 2929 case 'g': 2930 cp = tstr + 1; /* make sure it is set */ 2931 if (STRMOD_MATCH(tstr, "gmtime", 6)) { 2932 newStr = VarStrftime(nstr, 1); 2933 cp = tstr + 6; 2934 termc = *cp; 2935 } else { 2936 goto default_case; 2937 } 2938 break; 2939 case 'h': 2940 cp = tstr + 1; /* make sure it is set */ 2941 if (STRMOD_MATCH(tstr, "hash", 4)) { 2942 newStr = VarHash(nstr); 2943 cp = tstr + 4; 2944 termc = *cp; 2945 } else { 2946 goto default_case; 2947 } 2948 break; 2949 case 'l': 2950 cp = tstr + 1; /* make sure it is set */ 2951 if (STRMOD_MATCH(tstr, "localtime", 9)) { 2952 newStr = VarStrftime(nstr, 0); 2953 cp = tstr + 9; 2954 termc = *cp; 2955 } else { 2956 goto default_case; 2957 } 2958 break; 2959 case 't': 2960 { 2961 cp = tstr + 1; /* make sure it is set */ 2962 if (tstr[1] != endc && tstr[1] != ':') { 2963 if (tstr[1] == 's') { 2964 /* 2965 * Use the char (if any) at tstr[2] 2966 * as the word separator. 2967 */ 2968 VarPattern pattern; 2969 2970 if (tstr[2] != endc && 2971 (tstr[3] == endc || tstr[3] == ':')) { 2972 /* ":ts<unrecognised><endc>" or 2973 * ":ts<unrecognised>:" */ 2974 parsestate.varSpace = tstr[2]; 2975 cp = tstr + 3; 2976 } else if (tstr[2] == endc || tstr[2] == ':') { 2977 /* ":ts<endc>" or ":ts:" */ 2978 parsestate.varSpace = 0; /* no separator */ 2979 cp = tstr + 2; 2980 } else if (tstr[2] == '\\') { 2981 switch (tstr[3]) { 2982 case 'n': 2983 parsestate.varSpace = '\n'; 2984 cp = tstr + 4; 2985 break; 2986 case 't': 2987 parsestate.varSpace = '\t'; 2988 cp = tstr + 4; 2989 break; 2990 default: 2991 if (isdigit((unsigned char)tstr[3])) { 2992 char *ep; 2993 2994 parsestate.varSpace = 2995 strtoul(&tstr[3], &ep, 0); 2996 if (*ep != ':' && *ep != endc) 2997 goto bad_modifier; 2998 cp = ep; 2999 } else { 3000 /* 3001 * ":ts<backslash><unrecognised>". 3002 */ 3003 goto bad_modifier; 3004 } 3005 break; 3006 } 3007 } else { 3008 /* 3009 * Found ":ts<unrecognised><unrecognised>". 3010 */ 3011 goto bad_modifier; 3012 } 3013 3014 termc = *cp; 3015 3016 /* 3017 * We cannot be certain that VarModify 3018 * will be used - even if there is a 3019 * subsequent modifier, so do a no-op 3020 * VarSubstitute now to for str to be 3021 * re-expanded without the spaces. 3022 */ 3023 pattern.flags = VAR_SUB_ONE; 3024 pattern.lhs = pattern.rhs = "\032"; 3025 pattern.leftLen = pattern.rightLen = 1; 3026 3027 newStr = VarModify(ctxt, &parsestate, nstr, 3028 VarSubstitute, 3029 &pattern); 3030 } else if (tstr[2] == endc || tstr[2] == ':') { 3031 /* 3032 * Check for two-character options: 3033 * ":tu", ":tl" 3034 */ 3035 if (tstr[1] == 'A') { /* absolute path */ 3036 newStr = VarModify(ctxt, &parsestate, nstr, 3037 VarRealpath, NULL); 3038 cp = tstr + 2; 3039 termc = *cp; 3040 } else if (tstr[1] == 'u') { 3041 char *dp = bmake_strdup(nstr); 3042 for (newStr = dp; *dp; dp++) 3043 *dp = toupper((unsigned char)*dp); 3044 cp = tstr + 2; 3045 termc = *cp; 3046 } else if (tstr[1] == 'l') { 3047 char *dp = bmake_strdup(nstr); 3048 for (newStr = dp; *dp; dp++) 3049 *dp = tolower((unsigned char)*dp); 3050 cp = tstr + 2; 3051 termc = *cp; 3052 } else if (tstr[1] == 'W' || tstr[1] == 'w') { 3053 parsestate.oneBigWord = (tstr[1] == 'W'); 3054 newStr = nstr; 3055 cp = tstr + 2; 3056 termc = *cp; 3057 } else { 3058 /* Found ":t<unrecognised>:" or 3059 * ":t<unrecognised><endc>". */ 3060 goto bad_modifier; 3061 } 3062 } else { 3063 /* 3064 * Found ":t<unrecognised><unrecognised>". 3065 */ 3066 goto bad_modifier; 3067 } 3068 } else { 3069 /* 3070 * Found ":t<endc>" or ":t:". 3071 */ 3072 goto bad_modifier; 3073 } 3074 break; 3075 } 3076 case 'N': 3077 case 'M': 3078 { 3079 char *pattern; 3080 const char *endpat; /* points just after end of pattern */ 3081 char *cp2; 3082 Boolean copy; /* pattern should be, or has been, copied */ 3083 Boolean needSubst; 3084 int nest; 3085 3086 copy = FALSE; 3087 needSubst = FALSE; 3088 nest = 1; 3089 /* 3090 * In the loop below, ignore ':' unless we are at 3091 * (or back to) the original brace level. 3092 * XXX This will likely not work right if $() and ${} 3093 * are intermixed. 3094 */ 3095 for (cp = tstr + 1; 3096 *cp != '\0' && !(*cp == ':' && nest == 1); 3097 cp++) 3098 { 3099 if (*cp == '\\' && 3100 (cp[1] == ':' || 3101 cp[1] == endc || cp[1] == startc)) { 3102 if (!needSubst) { 3103 copy = TRUE; 3104 } 3105 cp++; 3106 continue; 3107 } 3108 if (*cp == '$') { 3109 needSubst = TRUE; 3110 } 3111 if (*cp == '(' || *cp == '{') 3112 ++nest; 3113 if (*cp == ')' || *cp == '}') { 3114 --nest; 3115 if (nest == 0) 3116 break; 3117 } 3118 } 3119 termc = *cp; 3120 endpat = cp; 3121 if (copy) { 3122 /* 3123 * Need to compress the \:'s out of the pattern, so 3124 * allocate enough room to hold the uncompressed 3125 * pattern (note that cp started at tstr+1, so 3126 * cp - tstr takes the null byte into account) and 3127 * compress the pattern into the space. 3128 */ 3129 pattern = bmake_malloc(cp - tstr); 3130 for (cp2 = pattern, cp = tstr + 1; 3131 cp < endpat; 3132 cp++, cp2++) 3133 { 3134 if ((*cp == '\\') && (cp+1 < endpat) && 3135 (cp[1] == ':' || cp[1] == endc)) { 3136 cp++; 3137 } 3138 *cp2 = *cp; 3139 } 3140 *cp2 = '\0'; 3141 endpat = cp2; 3142 } else { 3143 /* 3144 * Either Var_Subst or VarModify will need a 3145 * nul-terminated string soon, so construct one now. 3146 */ 3147 pattern = bmake_strndup(tstr+1, endpat - (tstr + 1)); 3148 } 3149 if (needSubst) { 3150 /* 3151 * pattern contains embedded '$', so use Var_Subst to 3152 * expand it. 3153 */ 3154 cp2 = pattern; 3155 pattern = Var_Subst(NULL, cp2, ctxt, errnum); 3156 free(cp2); 3157 } 3158 if (DEBUG(VAR)) 3159 fprintf(debug_file, "Pattern[%s] for [%s] is [%s]\n", 3160 v->name, nstr, pattern); 3161 if (*tstr == 'M') { 3162 newStr = VarModify(ctxt, &parsestate, nstr, VarMatch, 3163 pattern); 3164 } else { 3165 newStr = VarModify(ctxt, &parsestate, nstr, VarNoMatch, 3166 pattern); 3167 } 3168 free(pattern); 3169 break; 3170 } 3171 case 'S': 3172 { 3173 VarPattern pattern; 3174 Var_Parse_State tmpparsestate; 3175 3176 pattern.flags = 0; 3177 tmpparsestate = parsestate; 3178 delim = tstr[1]; 3179 tstr += 2; 3180 3181 /* 3182 * If pattern begins with '^', it is anchored to the 3183 * start of the word -- skip over it and flag pattern. 3184 */ 3185 if (*tstr == '^') { 3186 pattern.flags |= VAR_MATCH_START; 3187 tstr += 1; 3188 } 3189 3190 cp = tstr; 3191 if ((pattern.lhs = VarGetPattern(ctxt, &parsestate, errnum, 3192 &cp, delim, 3193 &pattern.flags, 3194 &pattern.leftLen, 3195 NULL)) == NULL) 3196 goto cleanup; 3197 3198 if ((pattern.rhs = VarGetPattern(ctxt, &parsestate, errnum, 3199 &cp, delim, NULL, 3200 &pattern.rightLen, 3201 &pattern)) == NULL) 3202 goto cleanup; 3203 3204 /* 3205 * Check for global substitution. If 'g' after the final 3206 * delimiter, substitution is global and is marked that 3207 * way. 3208 */ 3209 for (;; cp++) { 3210 switch (*cp) { 3211 case 'g': 3212 pattern.flags |= VAR_SUB_GLOBAL; 3213 continue; 3214 case '1': 3215 pattern.flags |= VAR_SUB_ONE; 3216 continue; 3217 case 'W': 3218 tmpparsestate.oneBigWord = TRUE; 3219 continue; 3220 } 3221 break; 3222 } 3223 3224 termc = *cp; 3225 newStr = VarModify(ctxt, &tmpparsestate, nstr, 3226 VarSubstitute, 3227 &pattern); 3228 3229 /* 3230 * Free the two strings. 3231 */ 3232 free(UNCONST(pattern.lhs)); 3233 free(UNCONST(pattern.rhs)); 3234 delim = '\0'; 3235 break; 3236 } 3237 case '?': 3238 { 3239 VarPattern pattern; 3240 Boolean value; 3241 3242 /* find ':', and then substitute accordingly */ 3243 3244 pattern.flags = 0; 3245 3246 cp = ++tstr; 3247 delim = ':'; 3248 if ((pattern.lhs = VarGetPattern(ctxt, &parsestate, errnum, 3249 &cp, delim, NULL, 3250 &pattern.leftLen, 3251 NULL)) == NULL) 3252 goto cleanup; 3253 3254 /* BROPEN or PROPEN */ 3255 delim = endc; 3256 if ((pattern.rhs = VarGetPattern(ctxt, &parsestate, errnum, 3257 &cp, delim, NULL, 3258 &pattern.rightLen, 3259 NULL)) == NULL) 3260 goto cleanup; 3261 3262 termc = *--cp; 3263 delim = '\0'; 3264 if (Cond_EvalExpression(NULL, v->name, &value, 0) 3265 == COND_INVALID) { 3266 Error("Bad conditional expression `%s' in %s?%s:%s", 3267 v->name, v->name, pattern.lhs, pattern.rhs); 3268 goto cleanup; 3269 } 3270 3271 if (value) { 3272 newStr = UNCONST(pattern.lhs); 3273 free(UNCONST(pattern.rhs)); 3274 } else { 3275 newStr = UNCONST(pattern.rhs); 3276 free(UNCONST(pattern.lhs)); 3277 } 3278 if (v->flags & VAR_JUNK) { 3279 v->flags |= VAR_KEEP; 3280 } 3281 break; 3282 } 3283 #ifndef NO_REGEX 3284 case 'C': 3285 { 3286 VarREPattern pattern; 3287 char *re; 3288 int error; 3289 Var_Parse_State tmpparsestate; 3290 3291 pattern.flags = 0; 3292 tmpparsestate = parsestate; 3293 delim = tstr[1]; 3294 tstr += 2; 3295 3296 cp = tstr; 3297 3298 if ((re = VarGetPattern(ctxt, &parsestate, errnum, &cp, delim, 3299 NULL, NULL, NULL)) == NULL) 3300 goto cleanup; 3301 3302 if ((pattern.replace = VarGetPattern(ctxt, &parsestate, 3303 errnum, &cp, delim, NULL, 3304 NULL, NULL)) == NULL){ 3305 free(re); 3306 goto cleanup; 3307 } 3308 3309 for (;; cp++) { 3310 switch (*cp) { 3311 case 'g': 3312 pattern.flags |= VAR_SUB_GLOBAL; 3313 continue; 3314 case '1': 3315 pattern.flags |= VAR_SUB_ONE; 3316 continue; 3317 case 'W': 3318 tmpparsestate.oneBigWord = TRUE; 3319 continue; 3320 } 3321 break; 3322 } 3323 3324 termc = *cp; 3325 3326 error = regcomp(&pattern.re, re, REG_EXTENDED); 3327 free(re); 3328 if (error) { 3329 *lengthPtr = cp - start + 1; 3330 VarREError(error, &pattern.re, "RE substitution error"); 3331 free(pattern.replace); 3332 goto cleanup; 3333 } 3334 3335 pattern.nsub = pattern.re.re_nsub + 1; 3336 if (pattern.nsub < 1) 3337 pattern.nsub = 1; 3338 if (pattern.nsub > 10) 3339 pattern.nsub = 10; 3340 pattern.matches = bmake_malloc(pattern.nsub * 3341 sizeof(regmatch_t)); 3342 newStr = VarModify(ctxt, &tmpparsestate, nstr, 3343 VarRESubstitute, 3344 &pattern); 3345 regfree(&pattern.re); 3346 free(pattern.replace); 3347 free(pattern.matches); 3348 delim = '\0'; 3349 break; 3350 } 3351 #endif 3352 case 'Q': 3353 if (tstr[1] == endc || tstr[1] == ':') { 3354 newStr = VarQuote(nstr); 3355 cp = tstr + 1; 3356 termc = *cp; 3357 break; 3358 } 3359 goto default_case; 3360 case 'T': 3361 if (tstr[1] == endc || tstr[1] == ':') { 3362 newStr = VarModify(ctxt, &parsestate, nstr, VarTail, 3363 NULL); 3364 cp = tstr + 1; 3365 termc = *cp; 3366 break; 3367 } 3368 goto default_case; 3369 case 'H': 3370 if (tstr[1] == endc || tstr[1] == ':') { 3371 newStr = VarModify(ctxt, &parsestate, nstr, VarHead, 3372 NULL); 3373 cp = tstr + 1; 3374 termc = *cp; 3375 break; 3376 } 3377 goto default_case; 3378 case 'E': 3379 if (tstr[1] == endc || tstr[1] == ':') { 3380 newStr = VarModify(ctxt, &parsestate, nstr, VarSuffix, 3381 NULL); 3382 cp = tstr + 1; 3383 termc = *cp; 3384 break; 3385 } 3386 goto default_case; 3387 case 'R': 3388 if (tstr[1] == endc || tstr[1] == ':') { 3389 newStr = VarModify(ctxt, &parsestate, nstr, VarRoot, 3390 NULL); 3391 cp = tstr + 1; 3392 termc = *cp; 3393 break; 3394 } 3395 goto default_case; 3396 case 'O': 3397 { 3398 char otype; 3399 3400 cp = tstr + 1; /* skip to the rest in any case */ 3401 if (tstr[1] == endc || tstr[1] == ':') { 3402 otype = 's'; 3403 termc = *cp; 3404 } else if ( (tstr[1] == 'x') && 3405 (tstr[2] == endc || tstr[2] == ':') ) { 3406 otype = tstr[1]; 3407 cp = tstr + 2; 3408 termc = *cp; 3409 } else { 3410 goto bad_modifier; 3411 } 3412 newStr = VarOrder(nstr, otype); 3413 break; 3414 } 3415 case 'u': 3416 if (tstr[1] == endc || tstr[1] == ':') { 3417 newStr = VarUniq(nstr); 3418 cp = tstr + 1; 3419 termc = *cp; 3420 break; 3421 } 3422 goto default_case; 3423 #ifdef SUNSHCMD 3424 case 's': 3425 if (tstr[1] == 'h' && (tstr[2] == endc || tstr[2] == ':')) { 3426 const char *emsg; 3427 newStr = Cmd_Exec(nstr, &emsg); 3428 if (emsg) 3429 Error(emsg, nstr); 3430 cp = tstr + 2; 3431 termc = *cp; 3432 break; 3433 } 3434 goto default_case; 3435 #endif 3436 default: 3437 default_case: 3438 { 3439 #ifdef SYSVVARSUB 3440 /* 3441 * This can either be a bogus modifier or a System-V 3442 * substitution command. 3443 */ 3444 VarPattern pattern; 3445 Boolean eqFound; 3446 3447 pattern.flags = 0; 3448 eqFound = FALSE; 3449 /* 3450 * First we make a pass through the string trying 3451 * to verify it is a SYSV-make-style translation: 3452 * it must be: <string1>=<string2>) 3453 */ 3454 cp = tstr; 3455 cnt = 1; 3456 while (*cp != '\0' && cnt) { 3457 if (*cp == '=') { 3458 eqFound = TRUE; 3459 /* continue looking for endc */ 3460 } 3461 else if (*cp == endc) 3462 cnt--; 3463 else if (*cp == startc) 3464 cnt++; 3465 if (cnt) 3466 cp++; 3467 } 3468 if (*cp == endc && eqFound) { 3469 3470 /* 3471 * Now we break this sucker into the lhs and 3472 * rhs. We must null terminate them of course. 3473 */ 3474 delim='='; 3475 cp = tstr; 3476 if ((pattern.lhs = VarGetPattern(ctxt, &parsestate, 3477 errnum, &cp, delim, &pattern.flags, 3478 &pattern.leftLen, NULL)) == NULL) 3479 goto cleanup; 3480 delim = endc; 3481 if ((pattern.rhs = VarGetPattern(ctxt, &parsestate, 3482 errnum, &cp, delim, NULL, &pattern.rightLen, 3483 &pattern)) == NULL) 3484 goto cleanup; 3485 3486 /* 3487 * SYSV modifications happen through the whole 3488 * string. Note the pattern is anchored at the end. 3489 */ 3490 termc = *--cp; 3491 delim = '\0'; 3492 if (pattern.leftLen == 0 && *nstr == '\0') { 3493 newStr = nstr; /* special case */ 3494 } else { 3495 newStr = VarModify(ctxt, &parsestate, nstr, 3496 VarSYSVMatch, 3497 &pattern); 3498 } 3499 free(UNCONST(pattern.lhs)); 3500 free(UNCONST(pattern.rhs)); 3501 } else 3502 #endif 3503 { 3504 Error("Unknown modifier '%c'", *tstr); 3505 for (cp = tstr+1; 3506 *cp != ':' && *cp != endc && *cp != '\0'; 3507 cp++) 3508 continue; 3509 termc = *cp; 3510 newStr = var_Error; 3511 } 3512 } 3513 } 3514 if (DEBUG(VAR)) { 3515 fprintf(debug_file, "Result[%s] of :%c is \"%s\"\n", 3516 v->name, modifier, newStr); 3517 } 3518 3519 if (newStr != nstr) { 3520 if (*freePtr) { 3521 free(nstr); 3522 *freePtr = NULL; 3523 } 3524 nstr = newStr; 3525 if (nstr != var_Error && nstr != varNoError) { 3526 *freePtr = nstr; 3527 } 3528 } 3529 if (termc == '\0' && endc != '\0') { 3530 Error("Unclosed variable specification (expecting '%c') for \"%s\" (value \"%s\") modifier %c", endc, v->name, nstr, modifier); 3531 } else if (termc == ':') { 3532 cp++; 3533 } 3534 tstr = cp; 3535 } 3536 out: 3537 *lengthPtr = tstr - start; 3538 return (nstr); 3539 3540 bad_modifier: 3541 /* "{(" */ 3542 Error("Bad modifier `:%.*s' for %s", (int)strcspn(tstr, ":)}"), tstr, 3543 v->name); 3544 3545 cleanup: 3546 *lengthPtr = cp - start; 3547 if (delim != '\0') 3548 Error("Unclosed substitution for %s (%c missing)", 3549 v->name, delim); 3550 if (*freePtr) { 3551 free(*freePtr); 3552 *freePtr = NULL; 3553 } 3554 return (var_Error); 3555 } 3556 3557 /*- 3558 *----------------------------------------------------------------------- 3559 * Var_Parse -- 3560 * Given the start of a variable invocation, extract the variable 3561 * name and find its value, then modify it according to the 3562 * specification. 3563 * 3564 * Input: 3565 * str The string to parse 3566 * ctxt The context for the variable 3567 * errnum TRUE if undefined variables are an error 3568 * lengthPtr OUT: The length of the specification 3569 * freePtr OUT: Non-NULL if caller should free *freePtr 3570 * 3571 * Results: 3572 * The (possibly-modified) value of the variable or var_Error if the 3573 * specification is invalid. The length of the specification is 3574 * placed in *lengthPtr (for invalid specifications, this is just 3575 * 2...?). 3576 * If *freePtr is non-NULL then it's a pointer that the caller 3577 * should pass to free() to free memory used by the result. 3578 * 3579 * Side Effects: 3580 * None. 3581 * 3582 *----------------------------------------------------------------------- 3583 */ 3584 /* coverity[+alloc : arg-*4] */ 3585 char * 3586 Var_Parse(const char *str, GNode *ctxt, Boolean errnum, int *lengthPtr, 3587 void **freePtr) 3588 { 3589 const char *tstr; /* Pointer into str */ 3590 Var *v; /* Variable in invocation */ 3591 Boolean haveModifier;/* TRUE if have modifiers for the variable */ 3592 char endc; /* Ending character when variable in parens 3593 * or braces */ 3594 char startc; /* Starting character when variable in parens 3595 * or braces */ 3596 int vlen; /* Length of variable name */ 3597 const char *start; /* Points to original start of str */ 3598 char *nstr; /* New string, used during expansion */ 3599 Boolean dynamic; /* TRUE if the variable is local and we're 3600 * expanding it in a non-local context. This 3601 * is done to support dynamic sources. The 3602 * result is just the invocation, unaltered */ 3603 Var_Parse_State parsestate; /* Flags passed to helper functions */ 3604 char name[2]; 3605 3606 *freePtr = NULL; 3607 dynamic = FALSE; 3608 start = str; 3609 parsestate.oneBigWord = FALSE; 3610 parsestate.varSpace = ' '; /* word separator */ 3611 3612 startc = str[1]; 3613 if (startc != PROPEN && startc != BROPEN) { 3614 /* 3615 * If it's not bounded by braces of some sort, life is much simpler. 3616 * We just need to check for the first character and return the 3617 * value if it exists. 3618 */ 3619 3620 /* Error out some really stupid names */ 3621 if (startc == '\0' || strchr(")}:$", startc)) { 3622 *lengthPtr = 1; 3623 return var_Error; 3624 } 3625 name[0] = startc; 3626 name[1] = '\0'; 3627 3628 v = VarFind(name, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD); 3629 if (v == NULL) { 3630 *lengthPtr = 2; 3631 3632 if ((ctxt == VAR_CMD) || (ctxt == VAR_GLOBAL)) { 3633 /* 3634 * If substituting a local variable in a non-local context, 3635 * assume it's for dynamic source stuff. We have to handle 3636 * this specially and return the longhand for the variable 3637 * with the dollar sign escaped so it makes it back to the 3638 * caller. Only four of the local variables are treated 3639 * specially as they are the only four that will be set 3640 * when dynamic sources are expanded. 3641 */ 3642 switch (str[1]) { 3643 case '@': 3644 return UNCONST("$(.TARGET)"); 3645 case '%': 3646 return UNCONST("$(.ARCHIVE)"); 3647 case '*': 3648 return UNCONST("$(.PREFIX)"); 3649 case '!': 3650 return UNCONST("$(.MEMBER)"); 3651 } 3652 } 3653 /* 3654 * Error 3655 */ 3656 return (errnum ? var_Error : varNoError); 3657 } else { 3658 haveModifier = FALSE; 3659 tstr = &str[1]; 3660 endc = str[1]; 3661 } 3662 } else { 3663 Buffer buf; /* Holds the variable name */ 3664 int depth = 1; 3665 3666 endc = startc == PROPEN ? PRCLOSE : BRCLOSE; 3667 Buf_Init(&buf, 0); 3668 3669 /* 3670 * Skip to the end character or a colon, whichever comes first. 3671 */ 3672 for (tstr = str + 2; *tstr != '\0'; tstr++) 3673 { 3674 /* 3675 * Track depth so we can spot parse errors. 3676 */ 3677 if (*tstr == startc) { 3678 depth++; 3679 } 3680 if (*tstr == endc) { 3681 if (--depth == 0) 3682 break; 3683 } 3684 if (depth == 1 && *tstr == ':') { 3685 break; 3686 } 3687 /* 3688 * A variable inside a variable, expand 3689 */ 3690 if (*tstr == '$') { 3691 int rlen; 3692 void *freeIt; 3693 char *rval = Var_Parse(tstr, ctxt, errnum, &rlen, &freeIt); 3694 if (rval != NULL) { 3695 Buf_AddBytes(&buf, strlen(rval), rval); 3696 } 3697 if (freeIt) 3698 free(freeIt); 3699 tstr += rlen - 1; 3700 } 3701 else 3702 Buf_AddByte(&buf, *tstr); 3703 } 3704 if (*tstr == ':') { 3705 haveModifier = TRUE; 3706 } else if (*tstr == endc) { 3707 haveModifier = FALSE; 3708 } else { 3709 /* 3710 * If we never did find the end character, return NULL 3711 * right now, setting the length to be the distance to 3712 * the end of the string, since that's what make does. 3713 */ 3714 *lengthPtr = tstr - str; 3715 Buf_Destroy(&buf, TRUE); 3716 return (var_Error); 3717 } 3718 str = Buf_GetAll(&buf, &vlen); 3719 3720 /* 3721 * At this point, str points into newly allocated memory from 3722 * buf, containing only the name of the variable. 3723 * 3724 * start and tstr point into the const string that was pointed 3725 * to by the original value of the str parameter. start points 3726 * to the '$' at the beginning of the string, while tstr points 3727 * to the char just after the end of the variable name -- this 3728 * will be '\0', ':', PRCLOSE, or BRCLOSE. 3729 */ 3730 3731 v = VarFind(str, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD); 3732 /* 3733 * Check also for bogus D and F forms of local variables since we're 3734 * in a local context and the name is the right length. 3735 */ 3736 if ((v == NULL) && (ctxt != VAR_CMD) && (ctxt != VAR_GLOBAL) && 3737 (vlen == 2) && (str[1] == 'F' || str[1] == 'D') && 3738 strchr("@%*!<>", str[0]) != NULL) { 3739 /* 3740 * Well, it's local -- go look for it. 3741 */ 3742 name[0] = *str; 3743 name[1] = '\0'; 3744 v = VarFind(name, ctxt, 0); 3745 3746 if (v != NULL) { 3747 /* 3748 * No need for nested expansion or anything, as we're 3749 * the only one who sets these things and we sure don't 3750 * but nested invocations in them... 3751 */ 3752 nstr = Buf_GetAll(&v->val, NULL); 3753 3754 if (str[1] == 'D') { 3755 nstr = VarModify(ctxt, &parsestate, nstr, VarHead, 3756 NULL); 3757 } else { 3758 nstr = VarModify(ctxt, &parsestate, nstr, VarTail, 3759 NULL); 3760 } 3761 /* 3762 * Resulting string is dynamically allocated, so 3763 * tell caller to free it. 3764 */ 3765 *freePtr = nstr; 3766 *lengthPtr = tstr-start+1; 3767 Buf_Destroy(&buf, TRUE); 3768 VarFreeEnv(v, TRUE); 3769 return nstr; 3770 } 3771 } 3772 3773 if (v == NULL) { 3774 if (((vlen == 1) || 3775 (((vlen == 2) && (str[1] == 'F' || str[1] == 'D')))) && 3776 ((ctxt == VAR_CMD) || (ctxt == VAR_GLOBAL))) 3777 { 3778 /* 3779 * If substituting a local variable in a non-local context, 3780 * assume it's for dynamic source stuff. We have to handle 3781 * this specially and return the longhand for the variable 3782 * with the dollar sign escaped so it makes it back to the 3783 * caller. Only four of the local variables are treated 3784 * specially as they are the only four that will be set 3785 * when dynamic sources are expanded. 3786 */ 3787 switch (*str) { 3788 case '@': 3789 case '%': 3790 case '*': 3791 case '!': 3792 dynamic = TRUE; 3793 break; 3794 } 3795 } else if ((vlen > 2) && (*str == '.') && 3796 isupper((unsigned char) str[1]) && 3797 ((ctxt == VAR_CMD) || (ctxt == VAR_GLOBAL))) 3798 { 3799 int len; 3800 3801 len = vlen - 1; 3802 if ((strncmp(str, ".TARGET", len) == 0) || 3803 (strncmp(str, ".ARCHIVE", len) == 0) || 3804 (strncmp(str, ".PREFIX", len) == 0) || 3805 (strncmp(str, ".MEMBER", len) == 0)) 3806 { 3807 dynamic = TRUE; 3808 } 3809 } 3810 3811 if (!haveModifier) { 3812 /* 3813 * No modifiers -- have specification length so we can return 3814 * now. 3815 */ 3816 *lengthPtr = tstr - start + 1; 3817 if (dynamic) { 3818 char *pstr = bmake_strndup(start, *lengthPtr); 3819 *freePtr = pstr; 3820 Buf_Destroy(&buf, TRUE); 3821 return(pstr); 3822 } else { 3823 Buf_Destroy(&buf, TRUE); 3824 return (errnum ? var_Error : varNoError); 3825 } 3826 } else { 3827 /* 3828 * Still need to get to the end of the variable specification, 3829 * so kludge up a Var structure for the modifications 3830 */ 3831 v = bmake_malloc(sizeof(Var)); 3832 v->name = UNCONST(str); 3833 Buf_Init(&v->val, 1); 3834 v->flags = VAR_JUNK; 3835 Buf_Destroy(&buf, FALSE); 3836 } 3837 } else 3838 Buf_Destroy(&buf, TRUE); 3839 } 3840 3841 if (v->flags & VAR_IN_USE) { 3842 Fatal("Variable %s is recursive.", v->name); 3843 /*NOTREACHED*/ 3844 } else { 3845 v->flags |= VAR_IN_USE; 3846 } 3847 /* 3848 * Before doing any modification, we have to make sure the value 3849 * has been fully expanded. If it looks like recursion might be 3850 * necessary (there's a dollar sign somewhere in the variable's value) 3851 * we just call Var_Subst to do any other substitutions that are 3852 * necessary. Note that the value returned by Var_Subst will have 3853 * been dynamically-allocated, so it will need freeing when we 3854 * return. 3855 */ 3856 nstr = Buf_GetAll(&v->val, NULL); 3857 if (strchr(nstr, '$') != NULL) { 3858 nstr = Var_Subst(NULL, nstr, ctxt, errnum); 3859 *freePtr = nstr; 3860 } 3861 3862 v->flags &= ~VAR_IN_USE; 3863 3864 if ((nstr != NULL) && haveModifier) { 3865 int used; 3866 /* 3867 * Skip initial colon. 3868 */ 3869 tstr++; 3870 3871 nstr = ApplyModifiers(nstr, tstr, startc, endc, 3872 v, ctxt, errnum, &used, freePtr); 3873 tstr += used; 3874 } 3875 if (*tstr) { 3876 *lengthPtr = tstr - start + 1; 3877 } else { 3878 *lengthPtr = tstr - start; 3879 } 3880 3881 if (v->flags & VAR_FROM_ENV) { 3882 Boolean destroy = FALSE; 3883 3884 if (nstr != Buf_GetAll(&v->val, NULL)) { 3885 destroy = TRUE; 3886 } else { 3887 /* 3888 * Returning the value unmodified, so tell the caller to free 3889 * the thing. 3890 */ 3891 *freePtr = nstr; 3892 } 3893 VarFreeEnv(v, destroy); 3894 } else if (v->flags & VAR_JUNK) { 3895 /* 3896 * Perform any free'ing needed and set *freePtr to NULL so the caller 3897 * doesn't try to free a static pointer. 3898 * If VAR_KEEP is also set then we want to keep str as is. 3899 */ 3900 if (!(v->flags & VAR_KEEP)) { 3901 if (*freePtr) { 3902 free(nstr); 3903 *freePtr = NULL; 3904 } 3905 if (dynamic) { 3906 nstr = bmake_strndup(start, *lengthPtr); 3907 *freePtr = nstr; 3908 } else { 3909 nstr = errnum ? var_Error : varNoError; 3910 } 3911 } 3912 if (nstr != Buf_GetAll(&v->val, NULL)) 3913 Buf_Destroy(&v->val, TRUE); 3914 free(v->name); 3915 free(v); 3916 } 3917 return (nstr); 3918 } 3919 3920 /*- 3921 *----------------------------------------------------------------------- 3922 * Var_Subst -- 3923 * Substitute for all variables in the given string in the given context 3924 * If undefErr is TRUE, Parse_Error will be called when an undefined 3925 * variable is encountered. 3926 * 3927 * Input: 3928 * var Named variable || NULL for all 3929 * str the string which to substitute 3930 * ctxt the context wherein to find variables 3931 * undefErr TRUE if undefineds are an error 3932 * 3933 * Results: 3934 * The resulting string. 3935 * 3936 * Side Effects: 3937 * None. The old string must be freed by the caller 3938 *----------------------------------------------------------------------- 3939 */ 3940 char * 3941 Var_Subst(const char *var, const char *str, GNode *ctxt, Boolean undefErr) 3942 { 3943 Buffer buf; /* Buffer for forming things */ 3944 char *val; /* Value to substitute for a variable */ 3945 int length; /* Length of the variable invocation */ 3946 Boolean trailingBslash; /* variable ends in \ */ 3947 void *freeIt = NULL; /* Set if it should be freed */ 3948 static Boolean errorReported; /* Set true if an error has already 3949 * been reported to prevent a plethora 3950 * of messages when recursing */ 3951 3952 Buf_Init(&buf, 0); 3953 errorReported = FALSE; 3954 trailingBslash = FALSE; 3955 3956 while (*str) { 3957 if (*str == '\n' && trailingBslash) 3958 Buf_AddByte(&buf, ' '); 3959 if (var == NULL && (*str == '$') && (str[1] == '$')) { 3960 /* 3961 * A dollar sign may be escaped either with another dollar sign. 3962 * In such a case, we skip over the escape character and store the 3963 * dollar sign into the buffer directly. 3964 */ 3965 str++; 3966 Buf_AddByte(&buf, *str); 3967 str++; 3968 } else if (*str != '$') { 3969 /* 3970 * Skip as many characters as possible -- either to the end of 3971 * the string or to the next dollar sign (variable invocation). 3972 */ 3973 const char *cp; 3974 3975 for (cp = str++; *str != '$' && *str != '\0'; str++) 3976 continue; 3977 Buf_AddBytes(&buf, str - cp, cp); 3978 } else { 3979 if (var != NULL) { 3980 int expand; 3981 for (;;) { 3982 if (str[1] == '\0') { 3983 /* A trailing $ is kind of a special case */ 3984 Buf_AddByte(&buf, str[0]); 3985 str++; 3986 expand = FALSE; 3987 } else if (str[1] != PROPEN && str[1] != BROPEN) { 3988 if (str[1] != *var || strlen(var) > 1) { 3989 Buf_AddBytes(&buf, 2, str); 3990 str += 2; 3991 expand = FALSE; 3992 } 3993 else 3994 expand = TRUE; 3995 break; 3996 } 3997 else { 3998 const char *p; 3999 4000 /* 4001 * Scan up to the end of the variable name. 4002 */ 4003 for (p = &str[2]; *p && 4004 *p != ':' && *p != PRCLOSE && *p != BRCLOSE; p++) 4005 if (*p == '$') 4006 break; 4007 /* 4008 * A variable inside the variable. We cannot expand 4009 * the external variable yet, so we try again with 4010 * the nested one 4011 */ 4012 if (*p == '$') { 4013 Buf_AddBytes(&buf, p - str, str); 4014 str = p; 4015 continue; 4016 } 4017 4018 if (strncmp(var, str + 2, p - str - 2) != 0 || 4019 var[p - str - 2] != '\0') { 4020 /* 4021 * Not the variable we want to expand, scan 4022 * until the next variable 4023 */ 4024 for (;*p != '$' && *p != '\0'; p++) 4025 continue; 4026 Buf_AddBytes(&buf, p - str, str); 4027 str = p; 4028 expand = FALSE; 4029 } 4030 else 4031 expand = TRUE; 4032 break; 4033 } 4034 } 4035 if (!expand) 4036 continue; 4037 } 4038 4039 val = Var_Parse(str, ctxt, undefErr, &length, &freeIt); 4040 4041 /* 4042 * When we come down here, val should either point to the 4043 * value of this variable, suitably modified, or be NULL. 4044 * Length should be the total length of the potential 4045 * variable invocation (from $ to end character...) 4046 */ 4047 if (val == var_Error || val == varNoError) { 4048 /* 4049 * If performing old-time variable substitution, skip over 4050 * the variable and continue with the substitution. Otherwise, 4051 * store the dollar sign and advance str so we continue with 4052 * the string... 4053 */ 4054 if (oldVars) { 4055 str += length; 4056 } else if (undefErr || val == var_Error) { 4057 /* 4058 * If variable is undefined, complain and skip the 4059 * variable. The complaint will stop us from doing anything 4060 * when the file is parsed. 4061 */ 4062 if (!errorReported) { 4063 Parse_Error(PARSE_FATAL, 4064 "Undefined variable \"%.*s\"",length,str); 4065 } 4066 str += length; 4067 errorReported = TRUE; 4068 } else { 4069 Buf_AddByte(&buf, *str); 4070 str += 1; 4071 } 4072 } else { 4073 /* 4074 * We've now got a variable structure to store in. But first, 4075 * advance the string pointer. 4076 */ 4077 str += length; 4078 4079 /* 4080 * Copy all the characters from the variable value straight 4081 * into the new string. 4082 */ 4083 length = strlen(val); 4084 Buf_AddBytes(&buf, length, val); 4085 trailingBslash = length > 0 && val[length - 1] == '\\'; 4086 } 4087 if (freeIt) { 4088 free(freeIt); 4089 freeIt = NULL; 4090 } 4091 } 4092 } 4093 4094 return Buf_DestroyCompact(&buf); 4095 } 4096 4097 /*- 4098 *----------------------------------------------------------------------- 4099 * Var_GetTail -- 4100 * Return the tail from each of a list of words. Used to set the 4101 * System V local variables. 4102 * 4103 * Input: 4104 * file Filename to modify 4105 * 4106 * Results: 4107 * The resulting string. 4108 * 4109 * Side Effects: 4110 * None. 4111 * 4112 *----------------------------------------------------------------------- 4113 */ 4114 #if 0 4115 char * 4116 Var_GetTail(char *file) 4117 { 4118 return(VarModify(file, VarTail, NULL)); 4119 } 4120 4121 /*- 4122 *----------------------------------------------------------------------- 4123 * Var_GetHead -- 4124 * Find the leading components of a (list of) filename(s). 4125 * XXX: VarHead does not replace foo by ., as (sun) System V make 4126 * does. 4127 * 4128 * Input: 4129 * file Filename to manipulate 4130 * 4131 * Results: 4132 * The leading components. 4133 * 4134 * Side Effects: 4135 * None. 4136 * 4137 *----------------------------------------------------------------------- 4138 */ 4139 char * 4140 Var_GetHead(char *file) 4141 { 4142 return(VarModify(file, VarHead, NULL)); 4143 } 4144 #endif 4145 4146 /*- 4147 *----------------------------------------------------------------------- 4148 * Var_Init -- 4149 * Initialize the module 4150 * 4151 * Results: 4152 * None 4153 * 4154 * Side Effects: 4155 * The VAR_CMD and VAR_GLOBAL contexts are created 4156 *----------------------------------------------------------------------- 4157 */ 4158 void 4159 Var_Init(void) 4160 { 4161 VAR_INTERNAL = Targ_NewGN("Internal"); 4162 VAR_GLOBAL = Targ_NewGN("Global"); 4163 VAR_CMD = Targ_NewGN("Command"); 4164 4165 } 4166 4167 4168 void 4169 Var_End(void) 4170 { 4171 } 4172 4173 4174 /****************** PRINT DEBUGGING INFO *****************/ 4175 static void 4176 VarPrintVar(void *vp) 4177 { 4178 Var *v = (Var *)vp; 4179 fprintf(debug_file, "%-16s = %s\n", v->name, Buf_GetAll(&v->val, NULL)); 4180 } 4181 4182 /*- 4183 *----------------------------------------------------------------------- 4184 * Var_Dump -- 4185 * print all variables in a context 4186 *----------------------------------------------------------------------- 4187 */ 4188 void 4189 Var_Dump(GNode *ctxt) 4190 { 4191 Hash_Search search; 4192 Hash_Entry *h; 4193 4194 for (h = Hash_EnumFirst(&ctxt->context, &search); 4195 h != NULL; 4196 h = Hash_EnumNext(&search)) { 4197 VarPrintVar(Hash_GetValue(h)); 4198 } 4199 } 4200