var.c revision 1.466
1 /* $NetBSD: var.c,v 1.466 2020/08/23 20:57:02 rillig 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 1.466 2020/08/23 20:57:02 rillig 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 1.466 2020/08/23 20:57:02 rillig 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. 92 * 93 * Var_Append Append more characters to an existing variable 94 * in the given context. The variable needn't 95 * exist already -- it will be created if it doesn't. 96 * A space is placed between the old value and the 97 * new one. 98 * 99 * Var_Exists See if a variable exists. 100 * 101 * Var_Value Return the unexpanded value of a variable in a 102 * context or NULL if the variable is undefined. 103 * 104 * Var_Subst Substitute either a single variable or all 105 * variables in a string, using the given context. 106 * 107 * Var_Parse Parse a variable expansion from a string and 108 * return the result and the number of characters 109 * consumed. 110 * 111 * Var_Delete Delete a variable in a context. 112 * 113 * Var_Init Initialize this module. 114 * 115 * Debugging: 116 * Var_Dump Print out all variables defined in the given 117 * context. 118 * 119 * XXX: There's a lot of duplication in these functions. 120 */ 121 122 #include <sys/stat.h> 123 #ifndef NO_REGEX 124 #include <sys/types.h> 125 #include <regex.h> 126 #endif 127 #include <inttypes.h> 128 #include <limits.h> 129 #include <time.h> 130 131 #include "make.h" 132 #include "enum.h" 133 #include "dir.h" 134 #include "job.h" 135 #include "metachar.h" 136 137 #define VAR_DEBUG_IF(cond, fmt, ...) \ 138 if (!(DEBUG(VAR) && (cond))) \ 139 (void) 0; \ 140 else \ 141 fprintf(debug_file, fmt, __VA_ARGS__) 142 143 #define VAR_DEBUG(fmt, ...) VAR_DEBUG_IF(TRUE, fmt, __VA_ARGS__) 144 145 ENUM_RTTI_3(VarEvalFlags, 146 VARE_UNDEFERR, 147 VARE_WANTRES, 148 VARE_ASSIGN); 149 150 /* 151 * This lets us tell if we have replaced the original environ 152 * (which we cannot free). 153 */ 154 char **savedEnv = NULL; 155 156 /* 157 * This is a harmless return value for Var_Parse that can be used by Var_Subst 158 * to determine if there was an error in parsing -- easier than returning 159 * a flag, as things outside this module don't give a hoot. 160 */ 161 char var_Error[] = ""; 162 163 /* 164 * Similar to var_Error, but returned when the 'VARE_UNDEFERR' flag for 165 * Var_Parse is not set. Why not just use a constant? Well, GCC likes 166 * to condense identical string instances... 167 */ 168 static char varNoError[] = ""; 169 170 /* 171 * Traditionally we consume $$ during := like any other expansion. 172 * Other make's do not. 173 * This knob allows controlling the behavior. 174 * FALSE to consume $$ during := assignment. 175 * TRUE to preserve $$ during := assignment. 176 */ 177 #define SAVE_DOLLARS ".MAKE.SAVE_DOLLARS" 178 static Boolean save_dollars = TRUE; 179 180 /* 181 * Internally, variables are contained in four different contexts. 182 * 1) the environment. They cannot be changed. If an environment 183 * variable is appended to, the result is placed in the global 184 * context. 185 * 2) the global context. Variables set in the Makefile are located in 186 * the global context. 187 * 3) the command-line context. All variables set on the command line 188 * are placed in this context. They are UNALTERABLE once placed here. 189 * 4) the local context. Each target has associated with it a context 190 * list. On this list are located the structures describing such 191 * local variables as $(@) and $(*) 192 * The four contexts are searched in the reverse order from which they are 193 * listed (but see checkEnvFirst). 194 */ 195 GNode *VAR_INTERNAL; /* variables from make itself */ 196 GNode *VAR_GLOBAL; /* variables from the makefile */ 197 GNode *VAR_CMD; /* variables defined on the command-line */ 198 199 typedef enum { 200 FIND_CMD = 0x01, /* look in VAR_CMD when searching */ 201 FIND_GLOBAL = 0x02, /* look in VAR_GLOBAL as well */ 202 FIND_ENV = 0x04 /* look in the environment also */ 203 } VarFindFlags; 204 205 typedef enum { 206 /* The variable's value is currently being used by Var_Parse or Var_Subst. 207 * This marker is used to avoid endless recursion. */ 208 VAR_IN_USE = 0x01, 209 /* The variable comes from the environment. 210 * These variables are not registered in any GNode, therefore they must 211 * be freed as soon as they are not used anymore. */ 212 VAR_FROM_ENV = 0x02, 213 /* The variable is a junk variable that should be destroyed when done with 214 * it. Used by Var_Parse for undefined, modified variables. */ 215 VAR_JUNK = 0x04, 216 /* Variable is VAR_JUNK, but we found a use for it in some modifier and 217 * the value is therefore valid. */ 218 VAR_KEEP = 0x08, 219 /* The variable is exported to the environment, to be used by child 220 * processes. */ 221 VAR_EXPORTED = 0x10, 222 /* At the point where this variable was exported, it contained an 223 * unresolved reference to another variable. Before any child process is 224 * started, it needs to be exported again, in the hope that the referenced 225 * variable can then be resolved. */ 226 VAR_REEXPORT = 0x20, 227 /* The variable came from command line. */ 228 VAR_FROM_CMD = 0x40, 229 VAR_READONLY = 0x80 230 } VarFlags; 231 232 ENUM_RTTI_8(VarFlags, 233 VAR_IN_USE, 234 VAR_FROM_ENV, 235 VAR_JUNK, 236 VAR_KEEP, 237 VAR_EXPORTED, 238 VAR_REEXPORT, 239 VAR_FROM_CMD, 240 VAR_READONLY); 241 242 typedef struct Var { 243 char *name; /* the variable's name; it is allocated for 244 * environment variables and aliased to the 245 * Hash_Entry name for all other variables, 246 * and thus must not be modified */ 247 Buffer val; /* its value */ 248 VarFlags flags; /* miscellaneous status flags */ 249 } Var; 250 251 /* 252 * Exporting vars is expensive so skip it if we can 253 */ 254 typedef enum { 255 VAR_EXPORTED_NONE, 256 VAR_EXPORTED_YES, 257 VAR_EXPORTED_ALL 258 } VarExportedMode; 259 260 static VarExportedMode var_exportedVars = VAR_EXPORTED_NONE; 261 262 typedef enum { 263 /* 264 * We pass this to Var_Export when doing the initial export 265 * or after updating an exported var. 266 */ 267 VAR_EXPORT_PARENT = 0x01, 268 /* 269 * We pass this to Var_Export1 to tell it to leave the value alone. 270 */ 271 VAR_EXPORT_LITERAL = 0x02 272 } VarExportFlags; 273 274 /* Flags for pattern matching in the :S and :C modifiers */ 275 typedef enum { 276 VARP_SUB_GLOBAL = 0x01, /* Apply substitution globally */ 277 VARP_SUB_ONE = 0x02, /* Apply substitution to one word */ 278 VARP_ANCHOR_START = 0x04, /* Match at start of word */ 279 VARP_ANCHOR_END = 0x08 /* Match at end of word */ 280 } VarPatternFlags; 281 282 #define BROPEN '{' 283 #define BRCLOSE '}' 284 #define PROPEN '(' 285 #define PRCLOSE ')' 286 287 /*- 288 *----------------------------------------------------------------------- 289 * VarFind -- 290 * Find the given variable in the given context and any other contexts 291 * indicated. 292 * 293 * Input: 294 * name name to find 295 * ctxt context in which to find it 296 * flags FIND_GLOBAL look in VAR_GLOBAL as well 297 * FIND_CMD look in VAR_CMD as well 298 * FIND_ENV look in the environment as well 299 * 300 * Results: 301 * A pointer to the structure describing the desired variable or 302 * NULL if the variable does not exist. 303 * 304 * Side Effects: 305 * None 306 *----------------------------------------------------------------------- 307 */ 308 static Var * 309 VarFind(const char *name, GNode *ctxt, VarFindFlags flags) 310 { 311 Hash_Entry *var; 312 313 /* 314 * If the variable name begins with a '.', it could very well be one of 315 * the local ones. We check the name against all the local variables 316 * and substitute the short version in for 'name' if it matches one of 317 * them. 318 */ 319 if (*name == '.' && isupper((unsigned char)name[1])) { 320 switch (name[1]) { 321 case 'A': 322 if (strcmp(name, ".ALLSRC") == 0) 323 name = ALLSRC; 324 if (strcmp(name, ".ARCHIVE") == 0) 325 name = ARCHIVE; 326 break; 327 case 'I': 328 if (strcmp(name, ".IMPSRC") == 0) 329 name = IMPSRC; 330 break; 331 case 'M': 332 if (strcmp(name, ".MEMBER") == 0) 333 name = MEMBER; 334 break; 335 case 'O': 336 if (strcmp(name, ".OODATE") == 0) 337 name = OODATE; 338 break; 339 case 'P': 340 if (strcmp(name, ".PREFIX") == 0) 341 name = PREFIX; 342 break; 343 case 'S': 344 if (strcmp(name, ".SHELL") == 0 ) { 345 if (!shellPath) 346 Shell_Init(); 347 } 348 break; 349 case 'T': 350 if (strcmp(name, ".TARGET") == 0) 351 name = TARGET; 352 break; 353 } 354 } 355 356 #ifdef notyet 357 /* for compatibility with gmake */ 358 if (name[0] == '^' && name[1] == '\0') 359 name = ALLSRC; 360 #endif 361 362 /* 363 * First look for the variable in the given context. If it's not there, 364 * look for it in VAR_CMD, VAR_GLOBAL and the environment, in that order, 365 * depending on the FIND_* flags in 'flags' 366 */ 367 var = Hash_FindEntry(&ctxt->context, name); 368 369 if (var == NULL && (flags & FIND_CMD) && ctxt != VAR_CMD) 370 var = Hash_FindEntry(&VAR_CMD->context, name); 371 372 if (!checkEnvFirst && var == NULL && (flags & FIND_GLOBAL) && 373 ctxt != VAR_GLOBAL) 374 { 375 var = Hash_FindEntry(&VAR_GLOBAL->context, name); 376 if (var == NULL && ctxt != VAR_INTERNAL) { 377 /* VAR_INTERNAL is subordinate to VAR_GLOBAL */ 378 var = Hash_FindEntry(&VAR_INTERNAL->context, name); 379 } 380 } 381 382 if (var == NULL && (flags & FIND_ENV)) { 383 char *env; 384 385 if ((env = getenv(name)) != NULL) { 386 Var *v = bmake_malloc(sizeof(Var)); 387 size_t len; 388 v->name = bmake_strdup(name); 389 390 len = strlen(env); 391 Buf_Init(&v->val, len + 1); 392 Buf_AddBytes(&v->val, env, len); 393 394 v->flags = VAR_FROM_ENV; 395 return v; 396 } 397 398 if (checkEnvFirst && (flags & FIND_GLOBAL) && ctxt != VAR_GLOBAL) { 399 var = Hash_FindEntry(&VAR_GLOBAL->context, name); 400 if (var == NULL && ctxt != VAR_INTERNAL) 401 var = Hash_FindEntry(&VAR_INTERNAL->context, name); 402 if (var == NULL) 403 return NULL; 404 else 405 return (Var *)Hash_GetValue(var); 406 } 407 408 return NULL; 409 } 410 411 if (var == NULL) 412 return NULL; 413 else 414 return (Var *)Hash_GetValue(var); 415 } 416 417 /*- 418 *----------------------------------------------------------------------- 419 * VarFreeEnv -- 420 * If the variable is an environment variable, free it 421 * 422 * Input: 423 * v the variable 424 * destroy true if the value buffer should be destroyed. 425 * 426 * Results: 427 * TRUE if it is an environment variable, FALSE otherwise. 428 *----------------------------------------------------------------------- 429 */ 430 static Boolean 431 VarFreeEnv(Var *v, Boolean destroy) 432 { 433 if (!(v->flags & VAR_FROM_ENV)) 434 return FALSE; 435 free(v->name); 436 Buf_Destroy(&v->val, destroy); 437 free(v); 438 return TRUE; 439 } 440 441 /* Add a new variable of the given name and value to the given context. 442 * The name and val arguments are duplicated so they may safely be freed. */ 443 static void 444 VarAdd(const char *name, const char *val, GNode *ctxt, VarSet_Flags flags) 445 { 446 Var *v = bmake_malloc(sizeof(Var)); 447 size_t len = strlen(val); 448 Hash_Entry *he; 449 450 Buf_Init(&v->val, len + 1); 451 Buf_AddBytes(&v->val, val, len); 452 453 v->flags = 0; 454 if (flags & VAR_SET_READONLY) 455 v->flags |= VAR_READONLY; 456 457 he = Hash_CreateEntry(&ctxt->context, name, NULL); 458 Hash_SetValue(he, v); 459 v->name = he->name; 460 VAR_DEBUG_IF(!(ctxt->flags & INTERNAL), 461 "%s:%s = %s\n", ctxt->name, name, val); 462 } 463 464 /* Remove a variable from a context, freeing the Var structure as well. */ 465 void 466 Var_Delete(const char *name, GNode *ctxt) 467 { 468 char *name_freeIt = NULL; 469 Hash_Entry *he; 470 471 if (strchr(name, '$') != NULL) 472 name = name_freeIt = Var_Subst(name, VAR_GLOBAL, VARE_WANTRES); 473 he = Hash_FindEntry(&ctxt->context, name); 474 VAR_DEBUG("%s:delete %s%s\n", 475 ctxt->name, name, he != NULL ? "" : " (not found)"); 476 free(name_freeIt); 477 478 if (he != NULL) { 479 Var *v = (Var *)Hash_GetValue(he); 480 if (v->flags & VAR_EXPORTED) 481 unsetenv(v->name); 482 if (strcmp(v->name, MAKE_EXPORTED) == 0) 483 var_exportedVars = VAR_EXPORTED_NONE; 484 if (v->name != he->name) 485 free(v->name); 486 Hash_DeleteEntry(&ctxt->context, he); 487 Buf_Destroy(&v->val, TRUE); 488 free(v); 489 } 490 } 491 492 493 /* 494 * Export a single variable. 495 * We ignore make internal variables (those which start with '.'). 496 * Also we jump through some hoops to avoid calling setenv 497 * more than necessary since it can leak. 498 * We only manipulate flags of vars if 'parent' is set. 499 */ 500 static Boolean 501 Var_Export1(const char *name, VarExportFlags flags) 502 { 503 VarExportFlags parent = flags & VAR_EXPORT_PARENT; 504 Var *v; 505 char *val; 506 507 if (name[0] == '.') 508 return FALSE; /* skip internals */ 509 if (name[1] == '\0') { 510 /* 511 * A single char. 512 * If it is one of the vars that should only appear in 513 * local context, skip it, else we can get Var_Subst 514 * into a loop. 515 */ 516 switch (name[0]) { 517 case '@': 518 case '%': 519 case '*': 520 case '!': 521 return FALSE; 522 } 523 } 524 525 v = VarFind(name, VAR_GLOBAL, 0); 526 if (v == NULL) 527 return FALSE; 528 529 if (!parent && (v->flags & VAR_EXPORTED) && !(v->flags & VAR_REEXPORT)) 530 return FALSE; /* nothing to do */ 531 532 val = Buf_GetAll(&v->val, NULL); 533 if (!(flags & VAR_EXPORT_LITERAL) && strchr(val, '$') != NULL) { 534 char *expr; 535 536 if (parent) { 537 /* 538 * Flag this as something we need to re-export. 539 * No point actually exporting it now though, 540 * the child can do it at the last minute. 541 */ 542 v->flags |= VAR_EXPORTED | VAR_REEXPORT; 543 return TRUE; 544 } 545 if (v->flags & VAR_IN_USE) { 546 /* 547 * We recursed while exporting in a child. 548 * This isn't going to end well, just skip it. 549 */ 550 return FALSE; 551 } 552 553 expr = str_concat3("${", name, "}"); 554 val = Var_Subst(expr, VAR_GLOBAL, VARE_WANTRES); 555 setenv(name, val, 1); 556 free(val); 557 free(expr); 558 } else { 559 if (parent) 560 v->flags &= ~(unsigned)VAR_REEXPORT; /* once will do */ 561 if (parent || !(v->flags & VAR_EXPORTED)) 562 setenv(name, val, 1); 563 } 564 /* 565 * This is so Var_Set knows to call Var_Export again... 566 */ 567 if (parent) { 568 v->flags |= VAR_EXPORTED; 569 } 570 return TRUE; 571 } 572 573 static void 574 Var_ExportVars_callback(void *entry, void *unused MAKE_ATTR_UNUSED) 575 { 576 Var *var = entry; 577 Var_Export1(var->name, 0); 578 } 579 580 /* 581 * This gets called from our children. 582 */ 583 void 584 Var_ExportVars(void) 585 { 586 char *val; 587 588 /* 589 * Several make's support this sort of mechanism for tracking 590 * recursion - but each uses a different name. 591 * We allow the makefiles to update MAKELEVEL and ensure 592 * children see a correctly incremented value. 593 */ 594 char tmp[BUFSIZ]; 595 snprintf(tmp, sizeof(tmp), "%d", makelevel + 1); 596 setenv(MAKE_LEVEL_ENV, tmp, 1); 597 598 if (var_exportedVars == VAR_EXPORTED_NONE) 599 return; 600 601 if (var_exportedVars == VAR_EXPORTED_ALL) { 602 /* Ouch! This is crazy... */ 603 Hash_ForEach(&VAR_GLOBAL->context, Var_ExportVars_callback, NULL); 604 return; 605 } 606 607 val = Var_Subst("${" MAKE_EXPORTED ":O:u}", VAR_GLOBAL, VARE_WANTRES); 608 if (*val) { 609 char **av; 610 char *as; 611 size_t ac; 612 size_t i; 613 614 av = brk_string(val, FALSE, &ac, &as); 615 for (i = 0; i < ac; i++) 616 Var_Export1(av[i], 0); 617 free(as); 618 free(av); 619 } 620 free(val); 621 } 622 623 /* 624 * This is called when .export is seen or .MAKE.EXPORTED is modified. 625 * 626 * It is also called when any exported variable is modified. 627 * XXX: Is it really? 628 * 629 * str has the format "[-env|-literal] varname...". 630 */ 631 void 632 Var_Export(const char *str, Boolean isExport) 633 { 634 VarExportFlags flags; 635 char *val; 636 637 if (isExport && str[0] == '\0') { 638 var_exportedVars = VAR_EXPORTED_ALL; /* use with caution! */ 639 return; 640 } 641 642 flags = 0; 643 if (strncmp(str, "-env", 4) == 0) { 644 str += 4; 645 } else if (strncmp(str, "-literal", 8) == 0) { 646 str += 8; 647 flags |= VAR_EXPORT_LITERAL; 648 } else { 649 flags |= VAR_EXPORT_PARENT; 650 } 651 652 val = Var_Subst(str, VAR_GLOBAL, VARE_WANTRES); 653 if (val[0] != '\0') { 654 char *as; 655 size_t ac; 656 char **av = brk_string(val, FALSE, &ac, &as); 657 658 size_t i; 659 for (i = 0; i < ac; i++) { 660 const char *name = av[i]; 661 if (Var_Export1(name, flags)) { 662 if (var_exportedVars != VAR_EXPORTED_ALL) 663 var_exportedVars = VAR_EXPORTED_YES; 664 if (isExport && (flags & VAR_EXPORT_PARENT)) { 665 Var_Append(MAKE_EXPORTED, name, VAR_GLOBAL); 666 } 667 } 668 } 669 free(as); 670 free(av); 671 } 672 free(val); 673 } 674 675 676 extern char **environ; 677 678 /* 679 * This is called when .unexport[-env] is seen. 680 * 681 * str must have the form "unexport[-env] varname...". 682 */ 683 void 684 Var_UnExport(const char *str) 685 { 686 const char *varnames; 687 char *varnames_freeIt; 688 Boolean unexport_env; 689 690 varnames = NULL; 691 varnames_freeIt = NULL; 692 693 str += strlen("unexport"); 694 unexport_env = strncmp(str, "-env", 4) == 0; 695 if (unexport_env) { 696 const char *cp; 697 char **newenv; 698 699 cp = getenv(MAKE_LEVEL_ENV); /* we should preserve this */ 700 if (environ == savedEnv) { 701 /* we have been here before! */ 702 newenv = bmake_realloc(environ, 2 * sizeof(char *)); 703 } else { 704 if (savedEnv) { 705 free(savedEnv); 706 savedEnv = NULL; 707 } 708 newenv = bmake_malloc(2 * sizeof(char *)); 709 } 710 711 /* Note: we cannot safely free() the original environ. */ 712 environ = savedEnv = newenv; 713 newenv[0] = NULL; 714 newenv[1] = NULL; 715 if (cp && *cp) 716 setenv(MAKE_LEVEL_ENV, cp, 1); 717 } else { 718 for (; isspace((unsigned char)*str); str++) 719 continue; 720 if (str[0] != '\0') 721 varnames = str; 722 } 723 724 if (varnames == NULL) { 725 /* Using .MAKE.EXPORTED */ 726 varnames = varnames_freeIt = Var_Subst("${" MAKE_EXPORTED ":O:u}", 727 VAR_GLOBAL, VARE_WANTRES); 728 } 729 730 if (TRUE) { 731 Var *v; 732 char **av; 733 char *as; 734 size_t ac; 735 size_t i; 736 737 av = brk_string(varnames, FALSE, &ac, &as); 738 for (i = 0; i < ac; i++) { 739 v = VarFind(av[i], VAR_GLOBAL, 0); 740 if (v == NULL) { 741 VAR_DEBUG("Not unexporting \"%s\" (not found)\n", av[i]); 742 continue; 743 } 744 745 VAR_DEBUG("Unexporting \"%s\"\n", av[i]); 746 if (!unexport_env && (v->flags & VAR_EXPORTED) && 747 !(v->flags & VAR_REEXPORT)) 748 unsetenv(v->name); 749 v->flags &= ~(unsigned)(VAR_EXPORTED | VAR_REEXPORT); 750 751 /* 752 * If we are unexporting a list, 753 * remove each one from .MAKE.EXPORTED. 754 * If we are removing them all, 755 * just delete .MAKE.EXPORTED below. 756 */ 757 if (varnames == str) { 758 char *expr = str_concat3("${" MAKE_EXPORTED ":N", v->name, "}"); 759 char *cp = Var_Subst(expr, VAR_GLOBAL, VARE_WANTRES); 760 Var_Set(MAKE_EXPORTED, cp, VAR_GLOBAL); 761 free(cp); 762 free(expr); 763 } 764 } 765 free(as); 766 free(av); 767 if (varnames != str) { 768 Var_Delete(MAKE_EXPORTED, VAR_GLOBAL); 769 free(varnames_freeIt); 770 } 771 } 772 } 773 774 /* See Var_Set for documentation. */ 775 void 776 Var_Set_with_flags(const char *name, const char *val, GNode *ctxt, 777 VarSet_Flags flags) 778 { 779 const char *unexpanded_name = name; 780 char *name_freeIt = NULL; 781 Var *v; 782 783 assert(val != NULL); 784 785 /* 786 * We only look for a variable in the given context since anything set 787 * here will override anything in a lower context, so there's not much 788 * point in searching them all just to save a bit of memory... 789 */ 790 if (strchr(name, '$') != NULL) 791 name = name_freeIt = Var_Subst(name, ctxt, VARE_WANTRES); 792 793 if (name[0] == '\0') { 794 VAR_DEBUG("Var_Set(\"%s\", \"%s\", ...) " 795 "name expands to empty string - ignored\n", 796 unexpanded_name, val); 797 free(name_freeIt); 798 return; 799 } 800 801 if (ctxt == VAR_GLOBAL) { 802 v = VarFind(name, VAR_CMD, 0); 803 if (v != NULL) { 804 if (v->flags & VAR_FROM_CMD) { 805 VAR_DEBUG("%s:%s = %s ignored!\n", ctxt->name, name, val); 806 goto out; 807 } 808 VarFreeEnv(v, TRUE); 809 } 810 } 811 812 v = VarFind(name, ctxt, 0); 813 if (v == NULL) { 814 if (ctxt == VAR_CMD && !(flags & VAR_NO_EXPORT)) { 815 /* 816 * This var would normally prevent the same name being added 817 * to VAR_GLOBAL, so delete it from there if needed. 818 * Otherwise -V name may show the wrong value. 819 */ 820 Var_Delete(name, VAR_GLOBAL); 821 } 822 VarAdd(name, val, ctxt, flags); 823 } else { 824 if ((v->flags & VAR_READONLY) && !(flags & VAR_SET_READONLY)) { 825 VAR_DEBUG("%s:%s = %s ignored (read-only)\n", 826 ctxt->name, name, val); 827 goto out; 828 } 829 Buf_Empty(&v->val); 830 if (val) 831 Buf_AddStr(&v->val, val); 832 833 VAR_DEBUG("%s:%s = %s\n", ctxt->name, name, val); 834 if (v->flags & VAR_EXPORTED) { 835 Var_Export1(name, VAR_EXPORT_PARENT); 836 } 837 } 838 /* 839 * Any variables given on the command line are automatically exported 840 * to the environment (as per POSIX standard) 841 * Other than internals. 842 */ 843 if (ctxt == VAR_CMD && !(flags & VAR_NO_EXPORT) && name[0] != '.') { 844 if (v == NULL) { 845 /* we just added it */ 846 v = VarFind(name, ctxt, 0); 847 } 848 if (v != NULL) 849 v->flags |= VAR_FROM_CMD; 850 /* 851 * If requested, don't export these in the environment 852 * individually. We still put them in MAKEOVERRIDES so 853 * that the command-line settings continue to override 854 * Makefile settings. 855 */ 856 if (!varNoExportEnv) 857 setenv(name, val ? val : "", 1); 858 859 Var_Append(MAKEOVERRIDES, name, VAR_GLOBAL); 860 } 861 if (name[0] == '.' && strcmp(name, SAVE_DOLLARS) == 0) 862 save_dollars = s2Boolean(val, save_dollars); 863 864 out: 865 free(name_freeIt); 866 if (v != NULL) 867 VarFreeEnv(v, TRUE); 868 } 869 870 /*- 871 *----------------------------------------------------------------------- 872 * Var_Set -- 873 * Set the variable name to the value val in the given context. 874 * 875 * Input: 876 * name name of variable to set 877 * val value to give to the variable 878 * ctxt context in which to set it 879 * 880 * Side Effects: 881 * If the variable doesn't yet exist, it is created. 882 * Otherwise the new value overwrites and replaces the old value. 883 * 884 * Notes: 885 * The variable is searched for only in its context before being 886 * created in that context. I.e. if the context is VAR_GLOBAL, 887 * only VAR_GLOBAL->context is searched. Likewise if it is VAR_CMD, only 888 * VAR_CMD->context is searched. This is done to avoid the literally 889 * thousands of unnecessary strcmp's that used to be done to 890 * set, say, $(@) or $(<). 891 * If the context is VAR_GLOBAL though, we check if the variable 892 * was set in VAR_CMD from the command line and skip it if so. 893 *----------------------------------------------------------------------- 894 */ 895 void 896 Var_Set(const char *name, const char *val, GNode *ctxt) 897 { 898 Var_Set_with_flags(name, val, ctxt, 0); 899 } 900 901 /*- 902 *----------------------------------------------------------------------- 903 * Var_Append -- 904 * The variable of the given name has the given value appended to it in 905 * the given context. 906 * 907 * Input: 908 * name name of variable to modify 909 * val string to append to it 910 * ctxt context in which this should occur 911 * 912 * Side Effects: 913 * If the variable doesn't exist, it is created. Otherwise the strings 914 * are concatenated, with a space in between. 915 * 916 * Notes: 917 * Only if the variable is being sought in the global context is the 918 * environment searched. 919 * XXX: Knows its calling circumstances in that if called with ctxt 920 * an actual target, it will only search that context since only 921 * a local variable could be being appended to. This is actually 922 * a big win and must be tolerated. 923 *----------------------------------------------------------------------- 924 */ 925 void 926 Var_Append(const char *name, const char *val, GNode *ctxt) 927 { 928 char *name_freeIt = NULL; 929 Var *v; 930 931 assert(val != NULL); 932 933 if (strchr(name, '$') != NULL) { 934 const char *unexpanded_name = name; 935 name = name_freeIt = Var_Subst(name, ctxt, VARE_WANTRES); 936 if (name[0] == '\0') { 937 VAR_DEBUG("Var_Append(\"%s\", \"%s\", ...) " 938 "name expands to empty string - ignored\n", 939 unexpanded_name, val); 940 free(name_freeIt); 941 return; 942 } 943 } 944 945 v = VarFind(name, ctxt, ctxt == VAR_GLOBAL ? (FIND_CMD | FIND_ENV) : 0); 946 947 if (v == NULL) { 948 Var_Set(name, val, ctxt); 949 } else if (ctxt == VAR_CMD || !(v->flags & VAR_FROM_CMD)) { 950 Buf_AddByte(&v->val, ' '); 951 Buf_AddStr(&v->val, val); 952 953 VAR_DEBUG("%s:%s = %s\n", ctxt->name, name, 954 Buf_GetAll(&v->val, NULL)); 955 956 if (v->flags & VAR_FROM_ENV) { 957 Hash_Entry *h; 958 959 /* 960 * If the original variable came from the environment, we 961 * have to install it in the global context (we could place 962 * it in the environment, but then we should provide a way to 963 * export other variables...) 964 */ 965 v->flags &= ~(unsigned)VAR_FROM_ENV; 966 h = Hash_CreateEntry(&ctxt->context, name, NULL); 967 Hash_SetValue(h, v); 968 } 969 } 970 free(name_freeIt); 971 } 972 973 /*- 974 *----------------------------------------------------------------------- 975 * Var_Exists -- 976 * See if the given variable exists. 977 * 978 * Input: 979 * name Variable to find 980 * ctxt Context in which to start search 981 * 982 * Results: 983 * TRUE if it does, FALSE if it doesn't 984 * 985 * Side Effects: 986 * None. 987 * 988 *----------------------------------------------------------------------- 989 */ 990 Boolean 991 Var_Exists(const char *name, GNode *ctxt) 992 { 993 char *name_freeIt = NULL; 994 Var *v; 995 996 if (strchr(name, '$') != NULL) 997 name = name_freeIt = Var_Subst(name, ctxt, VARE_WANTRES); 998 999 v = VarFind(name, ctxt, FIND_CMD | FIND_GLOBAL | FIND_ENV); 1000 free(name_freeIt); 1001 if (v == NULL) 1002 return FALSE; 1003 1004 (void)VarFreeEnv(v, TRUE); 1005 return TRUE; 1006 } 1007 1008 /*- 1009 *----------------------------------------------------------------------- 1010 * Var_Value -- 1011 * Return the unexpanded value of the given variable in the given 1012 * context, or the usual contexts. 1013 * 1014 * Input: 1015 * name name to find 1016 * ctxt context in which to search for it 1017 * 1018 * Results: 1019 * The value if the variable exists, NULL if it doesn't. 1020 * If the returned value is not NULL, the caller must free *freeIt 1021 * as soon as the returned value is no longer needed. 1022 *----------------------------------------------------------------------- 1023 */ 1024 const char * 1025 Var_Value(const char *name, GNode *ctxt, char **freeIt) 1026 { 1027 Var *v = VarFind(name, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD); 1028 char *p; 1029 1030 *freeIt = NULL; 1031 if (v == NULL) 1032 return NULL; 1033 1034 p = Buf_GetAll(&v->val, NULL); 1035 if (VarFreeEnv(v, FALSE)) 1036 *freeIt = p; 1037 return p; 1038 } 1039 1040 1041 /* SepBuf is a string being built from "words", interleaved with separators. */ 1042 typedef struct { 1043 Buffer buf; 1044 Boolean needSep; 1045 char sep; /* usually ' ', but see the :ts modifier */ 1046 } SepBuf; 1047 1048 static void 1049 SepBuf_Init(SepBuf *buf, char sep) 1050 { 1051 Buf_Init(&buf->buf, 32 /* bytes */); 1052 buf->needSep = FALSE; 1053 buf->sep = sep; 1054 } 1055 1056 static void 1057 SepBuf_Sep(SepBuf *buf) 1058 { 1059 buf->needSep = TRUE; 1060 } 1061 1062 static void 1063 SepBuf_AddBytes(SepBuf *buf, const char *mem, size_t mem_size) 1064 { 1065 if (mem_size == 0) 1066 return; 1067 if (buf->needSep && buf->sep != '\0') { 1068 Buf_AddByte(&buf->buf, buf->sep); 1069 buf->needSep = FALSE; 1070 } 1071 Buf_AddBytes(&buf->buf, mem, mem_size); 1072 } 1073 1074 static void 1075 SepBuf_AddBytesBetween(SepBuf *buf, const char *start, const char *end) 1076 { 1077 SepBuf_AddBytes(buf, start, (size_t)(end - start)); 1078 } 1079 1080 static void 1081 SepBuf_AddStr(SepBuf *buf, const char *str) 1082 { 1083 SepBuf_AddBytes(buf, str, strlen(str)); 1084 } 1085 1086 static char * 1087 SepBuf_Destroy(SepBuf *buf, Boolean free_buf) 1088 { 1089 return Buf_Destroy(&buf->buf, free_buf); 1090 } 1091 1092 1093 /* This callback for ModifyWords gets a single word from an expression and 1094 * typically adds a modification of this word to the buffer. It may also do 1095 * nothing or add several words. */ 1096 typedef void (*ModifyWordsCallback)(const char *word, SepBuf *buf, void *data); 1097 1098 1099 /* Callback for ModifyWords to implement the :H modifier. 1100 * Add the dirname of the given word to the buffer. */ 1101 static void 1102 ModifyWord_Head(const char *word, SepBuf *buf, void *dummy MAKE_ATTR_UNUSED) 1103 { 1104 const char *slash = strrchr(word, '/'); 1105 if (slash != NULL) 1106 SepBuf_AddBytesBetween(buf, word, slash); 1107 else 1108 SepBuf_AddStr(buf, "."); 1109 } 1110 1111 /* Callback for ModifyWords to implement the :T modifier. 1112 * Add the basename of the given word to the buffer. */ 1113 static void 1114 ModifyWord_Tail(const char *word, SepBuf *buf, void *dummy MAKE_ATTR_UNUSED) 1115 { 1116 const char *slash = strrchr(word, '/'); 1117 const char *base = slash != NULL ? slash + 1 : word; 1118 SepBuf_AddStr(buf, base); 1119 } 1120 1121 /* Callback for ModifyWords to implement the :E modifier. 1122 * Add the filename suffix of the given word to the buffer, if it exists. */ 1123 static void 1124 ModifyWord_Suffix(const char *word, SepBuf *buf, void *dummy MAKE_ATTR_UNUSED) 1125 { 1126 const char *dot = strrchr(word, '.'); 1127 if (dot != NULL) 1128 SepBuf_AddStr(buf, dot + 1); 1129 } 1130 1131 /* Callback for ModifyWords to implement the :R modifier. 1132 * Add the basename of the given word to the buffer. */ 1133 static void 1134 ModifyWord_Root(const char *word, SepBuf *buf, void *dummy MAKE_ATTR_UNUSED) 1135 { 1136 const char *dot = strrchr(word, '.'); 1137 size_t len = dot != NULL ? (size_t)(dot - word) : strlen(word); 1138 SepBuf_AddBytes(buf, word, len); 1139 } 1140 1141 /* Callback for ModifyWords to implement the :M modifier. 1142 * Place the word in the buffer if it matches the given pattern. */ 1143 static void 1144 ModifyWord_Match(const char *word, SepBuf *buf, void *data) 1145 { 1146 const char *pattern = data; 1147 VAR_DEBUG("VarMatch [%s] [%s]\n", word, pattern); 1148 if (Str_Match(word, pattern)) 1149 SepBuf_AddStr(buf, word); 1150 } 1151 1152 /* Callback for ModifyWords to implement the :N modifier. 1153 * Place the word in the buffer if it doesn't match the given pattern. */ 1154 static void 1155 ModifyWord_NoMatch(const char *word, SepBuf *buf, void *data) 1156 { 1157 const char *pattern = data; 1158 if (!Str_Match(word, pattern)) 1159 SepBuf_AddStr(buf, word); 1160 } 1161 1162 #ifdef SYSVVARSUB 1163 /*- 1164 *----------------------------------------------------------------------- 1165 * Str_SYSVMatch -- 1166 * Check word against pattern for a match (% is wild), 1167 * 1168 * Input: 1169 * word Word to examine 1170 * pattern Pattern to examine against 1171 * 1172 * Results: 1173 * Returns the start of the match, or NULL. 1174 * *match_len returns the length of the match, if any. 1175 * *hasPercent returns whether the pattern contains a percent. 1176 *----------------------------------------------------------------------- 1177 */ 1178 static const char * 1179 Str_SYSVMatch(const char *word, const char *pattern, size_t *match_len, 1180 Boolean *hasPercent) 1181 { 1182 const char *p = pattern; 1183 const char *w = word; 1184 const char *percent; 1185 size_t w_len; 1186 size_t p_len; 1187 const char *w_tail; 1188 1189 *hasPercent = FALSE; 1190 if (*p == '\0') { /* ${VAR:=suffix} */ 1191 *match_len = strlen(w); /* Null pattern is the whole string */ 1192 return w; 1193 } 1194 1195 percent = strchr(p, '%'); 1196 if (percent != NULL) { /* ${VAR:...%...=...} */ 1197 *hasPercent = TRUE; 1198 if (*w == '\0') 1199 return NULL; /* empty word does not match pattern */ 1200 1201 /* check that the prefix matches */ 1202 for (; p != percent && *w != '\0' && *w == *p; w++, p++) 1203 continue; 1204 if (p != percent) 1205 return NULL; /* No match */ 1206 1207 p++; /* Skip the percent */ 1208 if (*p == '\0') { 1209 /* No more pattern, return the rest of the string */ 1210 *match_len = strlen(w); 1211 return w; 1212 } 1213 } 1214 1215 /* Test whether the tail matches */ 1216 w_len = strlen(w); 1217 p_len = strlen(p); 1218 if (w_len < p_len) 1219 return NULL; 1220 1221 w_tail = w + w_len - p_len; 1222 if (memcmp(p, w_tail, p_len) != 0) 1223 return NULL; 1224 1225 *match_len = (size_t)(w_tail - w); 1226 return w; 1227 } 1228 1229 typedef struct { 1230 GNode *ctx; 1231 const char *lhs; 1232 const char *rhs; 1233 } ModifyWord_SYSVSubstArgs; 1234 1235 /* Callback for ModifyWords to implement the :%.from=%.to modifier. */ 1236 static void 1237 ModifyWord_SYSVSubst(const char *word, SepBuf *buf, void *data) 1238 { 1239 const ModifyWord_SYSVSubstArgs *args = data; 1240 char *rhs_expanded; 1241 const char *rhs; 1242 const char *percent; 1243 1244 size_t match_len; 1245 Boolean lhsPercent; 1246 const char *match = Str_SYSVMatch(word, args->lhs, &match_len, &lhsPercent); 1247 if (match == NULL) { 1248 SepBuf_AddStr(buf, word); 1249 return; 1250 } 1251 1252 /* Append rhs to the buffer, substituting the first '%' with the 1253 * match, but only if the lhs had a '%' as well. */ 1254 1255 rhs_expanded = Var_Subst(args->rhs, args->ctx, VARE_WANTRES); 1256 1257 rhs = rhs_expanded; 1258 percent = strchr(rhs, '%'); 1259 1260 if (percent != NULL && lhsPercent) { 1261 /* Copy the prefix of the replacement pattern */ 1262 SepBuf_AddBytesBetween(buf, rhs, percent); 1263 rhs = percent + 1; 1264 } 1265 if (percent != NULL || !lhsPercent) 1266 SepBuf_AddBytes(buf, match, match_len); 1267 1268 /* Append the suffix of the replacement pattern */ 1269 SepBuf_AddStr(buf, rhs); 1270 1271 free(rhs_expanded); 1272 } 1273 #endif 1274 1275 1276 typedef struct { 1277 const char *lhs; 1278 size_t lhsLen; 1279 const char *rhs; 1280 size_t rhsLen; 1281 VarPatternFlags pflags; 1282 Boolean matched; 1283 } ModifyWord_SubstArgs; 1284 1285 /* Callback for ModifyWords to implement the :S,from,to, modifier. 1286 * Perform a string substitution on the given word. */ 1287 static void 1288 ModifyWord_Subst(const char *word, SepBuf *buf, void *data) 1289 { 1290 size_t wordLen = strlen(word); 1291 ModifyWord_SubstArgs *args = data; 1292 const char *match; 1293 1294 if ((args->pflags & VARP_SUB_ONE) && args->matched) 1295 goto nosub; 1296 1297 if (args->pflags & VARP_ANCHOR_START) { 1298 if (wordLen < args->lhsLen || 1299 memcmp(word, args->lhs, args->lhsLen) != 0) 1300 goto nosub; 1301 1302 if (args->pflags & VARP_ANCHOR_END) { 1303 if (wordLen != args->lhsLen) 1304 goto nosub; 1305 1306 SepBuf_AddBytes(buf, args->rhs, args->rhsLen); 1307 args->matched = TRUE; 1308 } else { 1309 SepBuf_AddBytes(buf, args->rhs, args->rhsLen); 1310 SepBuf_AddBytes(buf, word + args->lhsLen, wordLen - args->lhsLen); 1311 args->matched = TRUE; 1312 } 1313 return; 1314 } 1315 1316 if (args->pflags & VARP_ANCHOR_END) { 1317 const char *start; 1318 1319 if (wordLen < args->lhsLen) 1320 goto nosub; 1321 1322 start = word + (wordLen - args->lhsLen); 1323 if (memcmp(start, args->lhs, args->lhsLen) != 0) 1324 goto nosub; 1325 1326 SepBuf_AddBytesBetween(buf, word, start); 1327 SepBuf_AddBytes(buf, args->rhs, args->rhsLen); 1328 args->matched = TRUE; 1329 return; 1330 } 1331 1332 /* unanchored case, may match more than once */ 1333 while ((match = Str_FindSubstring(word, args->lhs)) != NULL) { 1334 SepBuf_AddBytesBetween(buf, word, match); 1335 SepBuf_AddBytes(buf, args->rhs, args->rhsLen); 1336 args->matched = TRUE; 1337 wordLen -= (size_t)(match - word) + args->lhsLen; 1338 word += (size_t)(match - word) + args->lhsLen; 1339 if (wordLen == 0 || !(args->pflags & VARP_SUB_GLOBAL)) 1340 break; 1341 } 1342 nosub: 1343 SepBuf_AddBytes(buf, word, wordLen); 1344 } 1345 1346 #ifndef NO_REGEX 1347 /* Print the error caused by a regcomp or regexec call. */ 1348 static void 1349 VarREError(int reerr, regex_t *pat, const char *str) 1350 { 1351 size_t errlen = regerror(reerr, pat, 0, 0); 1352 char *errbuf = bmake_malloc(errlen); 1353 regerror(reerr, pat, errbuf, errlen); 1354 Error("%s: %s", str, errbuf); 1355 free(errbuf); 1356 } 1357 1358 typedef struct { 1359 regex_t re; 1360 size_t nsub; 1361 char *replace; 1362 VarPatternFlags pflags; 1363 Boolean matched; 1364 } ModifyWord_SubstRegexArgs; 1365 1366 /* Callback for ModifyWords to implement the :C/from/to/ modifier. 1367 * Perform a regex substitution on the given word. */ 1368 static void 1369 ModifyWord_SubstRegex(const char *word, SepBuf *buf, void *data) 1370 { 1371 ModifyWord_SubstRegexArgs *args = data; 1372 int xrv; 1373 const char *wp = word; 1374 char *rp; 1375 int flags = 0; 1376 regmatch_t m[10]; 1377 1378 if ((args->pflags & VARP_SUB_ONE) && args->matched) 1379 goto nosub; 1380 1381 tryagain: 1382 xrv = regexec(&args->re, wp, args->nsub, m, flags); 1383 1384 switch (xrv) { 1385 case 0: 1386 args->matched = TRUE; 1387 SepBuf_AddBytes(buf, wp, (size_t)m[0].rm_so); 1388 1389 for (rp = args->replace; *rp; rp++) { 1390 if (*rp == '\\' && (rp[1] == '&' || rp[1] == '\\')) { 1391 SepBuf_AddBytes(buf, rp + 1, 1); 1392 rp++; 1393 continue; 1394 } 1395 1396 if (*rp == '&') { 1397 SepBuf_AddBytesBetween(buf, wp + m[0].rm_so, wp + m[0].rm_eo); 1398 continue; 1399 } 1400 1401 if (*rp != '\\' || !isdigit((unsigned char)rp[1])) { 1402 SepBuf_AddBytes(buf, rp, 1); 1403 continue; 1404 } 1405 1406 { /* \0 to \9 backreference */ 1407 size_t n = (size_t)(rp[1] - '0'); 1408 rp++; 1409 1410 if (n >= args->nsub) { 1411 Error("No subexpression \\%zu", n); 1412 } else if (m[n].rm_so == -1 && m[n].rm_eo == -1) { 1413 Error("No match for subexpression \\%zu", n); 1414 } else { 1415 SepBuf_AddBytesBetween(buf, wp + m[n].rm_so, 1416 wp + m[n].rm_eo); 1417 } 1418 } 1419 } 1420 1421 wp += m[0].rm_eo; 1422 if (args->pflags & VARP_SUB_GLOBAL) { 1423 flags |= REG_NOTBOL; 1424 if (m[0].rm_so == 0 && m[0].rm_eo == 0) { 1425 SepBuf_AddBytes(buf, wp, 1); 1426 wp++; 1427 } 1428 if (*wp) 1429 goto tryagain; 1430 } 1431 if (*wp) { 1432 SepBuf_AddStr(buf, wp); 1433 } 1434 break; 1435 default: 1436 VarREError(xrv, &args->re, "Unexpected regex error"); 1437 /* fall through */ 1438 case REG_NOMATCH: 1439 nosub: 1440 SepBuf_AddStr(buf, wp); 1441 break; 1442 } 1443 } 1444 #endif 1445 1446 1447 typedef struct { 1448 GNode *ctx; 1449 char *tvar; /* name of temporary variable */ 1450 char *str; /* string to expand */ 1451 VarEvalFlags eflags; 1452 } ModifyWord_LoopArgs; 1453 1454 /* Callback for ModifyWords to implement the :@var (at) ...@ modifier of ODE make. */ 1455 static void 1456 ModifyWord_Loop(const char *word, SepBuf *buf, void *data) 1457 { 1458 const ModifyWord_LoopArgs *args; 1459 char *s; 1460 1461 if (word[0] == '\0') 1462 return; 1463 1464 args = data; 1465 Var_Set_with_flags(args->tvar, word, args->ctx, VAR_NO_EXPORT); 1466 s = Var_Subst(args->str, args->ctx, args->eflags); 1467 1468 VAR_DEBUG("ModifyWord_Loop: in \"%s\", replace \"%s\" with \"%s\" " 1469 "to \"%s\"\n", 1470 word, args->tvar, args->str, s ? s : "(null)"); 1471 1472 if (s != NULL && s[0] != '\0') { 1473 if (s[0] == '\n' || (buf->buf.count > 0 && 1474 buf->buf.buffer[buf->buf.count - 1] == '\n')) 1475 buf->needSep = FALSE; 1476 SepBuf_AddStr(buf, s); 1477 } 1478 free(s); 1479 } 1480 1481 1482 /*- 1483 * Implements the :[first..last] modifier. 1484 * This is a special case of ModifyWords since we want to be able 1485 * to scan the list backwards if first > last. 1486 */ 1487 static char * 1488 VarSelectWords(char sep, Boolean oneBigWord, const char *str, int first, 1489 int last) 1490 { 1491 char **av; /* word list */ 1492 char *as; /* word list memory */ 1493 size_t ac; 1494 int start, end, step; 1495 int i; 1496 1497 SepBuf buf; 1498 SepBuf_Init(&buf, sep); 1499 1500 if (oneBigWord) { 1501 /* fake what brk_string() would do if there were only one word */ 1502 ac = 1; 1503 av = bmake_malloc((ac + 1) * sizeof(char *)); 1504 as = bmake_strdup(str); 1505 av[0] = as; 1506 av[1] = NULL; 1507 } else { 1508 av = brk_string(str, FALSE, &ac, &as); 1509 } 1510 1511 /* 1512 * Now sanitize the given range. 1513 * If first or last are negative, convert them to the positive equivalents 1514 * (-1 gets converted to ac, -2 gets converted to (ac - 1), etc.). 1515 */ 1516 if (first < 0) 1517 first += (int)ac + 1; 1518 if (last < 0) 1519 last += (int)ac + 1; 1520 1521 /* 1522 * We avoid scanning more of the list than we need to. 1523 */ 1524 if (first > last) { 1525 start = MIN((int)ac, first) - 1; 1526 end = MAX(0, last - 1); 1527 step = -1; 1528 } else { 1529 start = MAX(0, first - 1); 1530 end = MIN((int)ac, last); 1531 step = 1; 1532 } 1533 1534 for (i = start; (step < 0) == (i >= end); i += step) { 1535 SepBuf_AddStr(&buf, av[i]); 1536 SepBuf_Sep(&buf); 1537 } 1538 1539 free(as); 1540 free(av); 1541 1542 return SepBuf_Destroy(&buf, FALSE); 1543 } 1544 1545 1546 /* Callback for ModifyWords to implement the :tA modifier. 1547 * Replace each word with the result of realpath() if successful. */ 1548 static void 1549 ModifyWord_Realpath(const char *word, SepBuf *buf, void *data MAKE_ATTR_UNUSED) 1550 { 1551 struct stat st; 1552 char rbuf[MAXPATHLEN]; 1553 1554 const char *rp = cached_realpath(word, rbuf); 1555 if (rp != NULL && *rp == '/' && stat(rp, &st) == 0) 1556 word = rp; 1557 1558 SepBuf_AddStr(buf, word); 1559 } 1560 1561 /*- 1562 *----------------------------------------------------------------------- 1563 * Modify each of the words of the passed string using the given function. 1564 * 1565 * Input: 1566 * str String whose words should be modified 1567 * modifyWord Function that modifies a single word 1568 * modifyWord_args Custom arguments for modifyWord 1569 * 1570 * Results: 1571 * A string of all the words modified appropriately. 1572 *----------------------------------------------------------------------- 1573 */ 1574 static char * 1575 ModifyWords(GNode *ctx, char sep, Boolean oneBigWord, const char *str, 1576 ModifyWordsCallback modifyWord, void *modifyWord_args) 1577 { 1578 SepBuf result; 1579 char **av; /* word list */ 1580 char *as; /* word list memory */ 1581 size_t ac; 1582 size_t i; 1583 1584 if (oneBigWord) { 1585 SepBuf_Init(&result, sep); 1586 modifyWord(str, &result, modifyWord_args); 1587 return SepBuf_Destroy(&result, FALSE); 1588 } 1589 1590 SepBuf_Init(&result, sep); 1591 1592 av = brk_string(str, FALSE, &ac, &as); 1593 1594 VAR_DEBUG("ModifyWords: split \"%s\" into %zu words\n", str, ac); 1595 1596 for (i = 0; i < ac; i++) { 1597 modifyWord(av[i], &result, modifyWord_args); 1598 if (result.buf.count > 0) 1599 SepBuf_Sep(&result); 1600 } 1601 1602 free(as); 1603 free(av); 1604 1605 return SepBuf_Destroy(&result, FALSE); 1606 } 1607 1608 1609 static char * 1610 WordList_JoinFree(char **av, size_t ac, char *as) 1611 { 1612 Buffer buf; 1613 size_t i; 1614 1615 Buf_Init(&buf, 0); 1616 1617 for (i = 0; i < ac; i++) { 1618 if (i != 0) 1619 Buf_AddByte(&buf, ' '); /* XXX: st->sep, for consistency */ 1620 Buf_AddStr(&buf, av[i]); 1621 } 1622 1623 free(av); 1624 free(as); 1625 1626 return Buf_Destroy(&buf, FALSE); 1627 } 1628 1629 /* Remove adjacent duplicate words. */ 1630 static char * 1631 VarUniq(const char *str) 1632 { 1633 char *as; /* Word list memory */ 1634 size_t ac; 1635 char **av = brk_string(str, FALSE, &ac, &as); 1636 1637 if (ac > 1) { 1638 size_t i, j; 1639 for (j = 0, i = 1; i < ac; i++) 1640 if (strcmp(av[i], av[j]) != 0 && (++j != i)) 1641 av[j] = av[i]; 1642 ac = j + 1; 1643 } 1644 1645 return WordList_JoinFree(av, ac, as); 1646 } 1647 1648 1649 /*- 1650 * Parse a text part of a modifier such as the "from" and "to" in :S/from/to/ 1651 * or the :@ modifier, until the next unescaped delimiter. The delimiter, as 1652 * well as the backslash or the dollar, can be escaped with a backslash. 1653 * 1654 * Return the parsed (and possibly expanded) string, or NULL if no delimiter 1655 * was found. On successful return, the parsing position pp points right 1656 * after the delimiter. The delimiter is not included in the returned 1657 * value though. 1658 */ 1659 static char * 1660 ParseModifierPart( 1661 const char **pp, /* The parsing position, updated upon return */ 1662 int delim, /* Parsing stops at this delimiter */ 1663 VarEvalFlags eflags, /* Flags for evaluating nested variables; 1664 * if VARE_WANTRES is not set, the text is 1665 * only parsed */ 1666 GNode *ctxt, /* For looking up nested variables */ 1667 size_t *out_length, /* Optionally stores the length of the returned 1668 * string, just to save another strlen call. */ 1669 VarPatternFlags *out_pflags,/* For the first part of the :S modifier, 1670 * sets the VARP_ANCHOR_END flag if the last 1671 * character of the pattern is a $. */ 1672 ModifyWord_SubstArgs *subst /* For the second part of the :S modifier, 1673 * allow ampersands to be escaped and replace 1674 * unescaped ampersands with subst->lhs. */ 1675 ) { 1676 Buffer buf; 1677 const char *p; 1678 char *rstr; 1679 1680 Buf_Init(&buf, 0); 1681 1682 /* 1683 * Skim through until the matching delimiter is found; 1684 * pick up variable substitutions on the way. Also allow 1685 * backslashes to quote the delimiter, $, and \, but don't 1686 * touch other backslashes. 1687 */ 1688 p = *pp; 1689 while (*p != '\0' && *p != delim) { 1690 const char *varstart; 1691 1692 Boolean is_escaped = p[0] == '\\' && ( 1693 p[1] == delim || p[1] == '\\' || p[1] == '$' || 1694 (p[1] == '&' && subst != NULL)); 1695 if (is_escaped) { 1696 Buf_AddByte(&buf, p[1]); 1697 p += 2; 1698 continue; 1699 } 1700 1701 if (*p != '$') { /* Unescaped, simple text */ 1702 if (subst != NULL && *p == '&') 1703 Buf_AddBytes(&buf, subst->lhs, subst->lhsLen); 1704 else 1705 Buf_AddByte(&buf, *p); 1706 p++; 1707 continue; 1708 } 1709 1710 if (p[1] == delim) { /* Unescaped $ at end of pattern */ 1711 if (out_pflags != NULL) 1712 *out_pflags |= VARP_ANCHOR_END; 1713 else 1714 Buf_AddByte(&buf, *p); 1715 p++; 1716 continue; 1717 } 1718 1719 if (eflags & VARE_WANTRES) { /* Nested variable, evaluated */ 1720 const char *cp2; 1721 int len; 1722 void *freeIt; 1723 VarEvalFlags nested_eflags = eflags & ~(unsigned)VARE_ASSIGN; 1724 1725 cp2 = Var_Parse(p, ctxt, nested_eflags, &len, &freeIt); 1726 Buf_AddStr(&buf, cp2); 1727 free(freeIt); 1728 p += len; 1729 continue; 1730 } 1731 1732 /* XXX: This whole block is very similar to Var_Parse without 1733 * VARE_WANTRES. There may be subtle edge cases though that are 1734 * not yet covered in the unit tests and that are parsed differently, 1735 * depending on whether they are evaluated or not. 1736 * 1737 * This subtle difference is not documented in the manual page, 1738 * neither is the difference between parsing :D and :M documented. 1739 * No code should ever depend on these details, but who knows. */ 1740 1741 varstart = p; /* Nested variable, only parsed */ 1742 if (p[1] == PROPEN || p[1] == BROPEN) { 1743 /* 1744 * Find the end of this variable reference 1745 * and suck it in without further ado. 1746 * It will be interpreted later. 1747 */ 1748 int have = p[1]; 1749 int want = have == PROPEN ? PRCLOSE : BRCLOSE; 1750 int depth = 1; 1751 1752 for (p += 2; *p != '\0' && depth > 0; p++) { 1753 if (p[-1] != '\\') { 1754 if (*p == have) 1755 depth++; 1756 if (*p == want) 1757 depth--; 1758 } 1759 } 1760 Buf_AddBytesBetween(&buf, varstart, p); 1761 } else { 1762 Buf_AddByte(&buf, *varstart); 1763 p++; 1764 } 1765 } 1766 1767 if (*p != delim) { 1768 *pp = p; 1769 return NULL; 1770 } 1771 1772 *pp = ++p; 1773 if (out_length != NULL) 1774 *out_length = Buf_Size(&buf); 1775 1776 rstr = Buf_Destroy(&buf, FALSE); 1777 VAR_DEBUG("Modifier part: \"%s\"\n", rstr); 1778 return rstr; 1779 } 1780 1781 /*- 1782 *----------------------------------------------------------------------- 1783 * VarQuote -- 1784 * Quote shell meta-characters and space characters in the string 1785 * if quoteDollar is set, also quote and double any '$' characters. 1786 * 1787 * Results: 1788 * The quoted string 1789 * 1790 * Side Effects: 1791 * None. 1792 * 1793 *----------------------------------------------------------------------- 1794 */ 1795 static char * 1796 VarQuote(char *str, Boolean quoteDollar) 1797 { 1798 Buffer buf; 1799 Buf_Init(&buf, 0); 1800 1801 for (; *str != '\0'; str++) { 1802 if (*str == '\n') { 1803 const char *newline = Shell_GetNewline(); 1804 if (newline == NULL) 1805 newline = "\\\n"; 1806 Buf_AddStr(&buf, newline); 1807 continue; 1808 } 1809 if (isspace((unsigned char)*str) || ismeta((unsigned char)*str)) 1810 Buf_AddByte(&buf, '\\'); 1811 Buf_AddByte(&buf, *str); 1812 if (quoteDollar && *str == '$') 1813 Buf_AddStr(&buf, "\\$"); 1814 } 1815 1816 str = Buf_Destroy(&buf, FALSE); 1817 VAR_DEBUG("QuoteMeta: [%s]\n", str); 1818 return str; 1819 } 1820 1821 /* Compute the 32-bit hash of the given string, using the MurmurHash3 1822 * algorithm. Output is encoded as 8 hex digits, in Little Endian order. */ 1823 static char * 1824 VarHash(const char *str) 1825 { 1826 static const char hexdigits[16] = "0123456789abcdef"; 1827 const unsigned char *ustr = (const unsigned char *)str; 1828 1829 uint32_t h = 0x971e137bU; 1830 uint32_t c1 = 0x95543787U; 1831 uint32_t c2 = 0x2ad7eb25U; 1832 size_t len2 = strlen(str); 1833 1834 char *buf; 1835 size_t i; 1836 1837 size_t len; 1838 for (len = len2; len; ) { 1839 uint32_t k = 0; 1840 switch (len) { 1841 default: 1842 k = ((uint32_t)ustr[3] << 24) | 1843 ((uint32_t)ustr[2] << 16) | 1844 ((uint32_t)ustr[1] << 8) | 1845 (uint32_t)ustr[0]; 1846 len -= 4; 1847 ustr += 4; 1848 break; 1849 case 3: 1850 k |= (uint32_t)ustr[2] << 16; 1851 /* FALLTHROUGH */ 1852 case 2: 1853 k |= (uint32_t)ustr[1] << 8; 1854 /* FALLTHROUGH */ 1855 case 1: 1856 k |= (uint32_t)ustr[0]; 1857 len = 0; 1858 } 1859 c1 = c1 * 5 + 0x7b7d159cU; 1860 c2 = c2 * 5 + 0x6bce6396U; 1861 k *= c1; 1862 k = (k << 11) ^ (k >> 21); 1863 k *= c2; 1864 h = (h << 13) ^ (h >> 19); 1865 h = h * 5 + 0x52dce729U; 1866 h ^= k; 1867 } 1868 h ^= (uint32_t)len2; 1869 h *= 0x85ebca6b; 1870 h ^= h >> 13; 1871 h *= 0xc2b2ae35; 1872 h ^= h >> 16; 1873 1874 buf = bmake_malloc(9); 1875 for (i = 0; i < 8; i++) { 1876 buf[i] = hexdigits[h & 0x0f]; 1877 h >>= 4; 1878 } 1879 buf[8] = '\0'; 1880 return buf; 1881 } 1882 1883 static char * 1884 VarStrftime(const char *fmt, Boolean zulu, time_t tim) 1885 { 1886 char buf[BUFSIZ]; 1887 1888 if (!tim) 1889 time(&tim); 1890 if (!*fmt) 1891 fmt = "%c"; 1892 strftime(buf, sizeof(buf), fmt, zulu ? gmtime(&tim) : localtime(&tim)); 1893 1894 buf[sizeof(buf) - 1] = '\0'; 1895 return bmake_strdup(buf); 1896 } 1897 1898 /* The ApplyModifier functions all work in the same way. They get the 1899 * current parsing position (pp) and parse the modifier from there. The 1900 * modifier typically lasts until the next ':', or a closing '}', ')' 1901 * (taken from st->endc), or the end of the string (parse error). 1902 * 1903 * After parsing, no matter whether successful or not, they set the parsing 1904 * position to the character after the modifier, or in case of parse errors, 1905 * just increment the parsing position. (That's how it is right now, it 1906 * shouldn't hurt to keep the parsing position as-is in case of parse errors.) 1907 * 1908 * On success, an ApplyModifier function: 1909 * * sets the parsing position *pp to the first character following the 1910 * current modifier 1911 * * processes the current variable value from st->val to produce the 1912 * modified variable value and stores it in st->newVal 1913 * * returns AMR_OK 1914 * 1915 * On parse errors, an ApplyModifier function: 1916 * * either issues a custom error message and then returns AMR_CLEANUP 1917 * * or returns AMR_BAD to issue the standard "Bad modifier" error message 1918 * In both of these cases, it updates the parsing position. 1919 * Modifiers that use ParseModifierPart typically set st->missing_delim 1920 * and then return AMR_CLEANUP to issue the standard error message. 1921 * 1922 * If the expected modifier was not found, several modifiers return AMR_UNKNOWN 1923 * to fall back to the SysV modifier ${VAR:from=to}. This is especially 1924 * useful for newly added long-name modifiers, to avoid breaking any existing 1925 * code. In such a case the parsing position must not be changed. 1926 */ 1927 1928 typedef struct { 1929 const char startc; /* '\0' or '{' or '(' */ 1930 const char endc; /* '\0' or '}' or ')' */ 1931 Var * const v; 1932 GNode * const ctxt; 1933 const VarEvalFlags eflags; 1934 1935 char *val; /* The old value of the expression, 1936 * before applying the modifier, never NULL */ 1937 char *newVal; /* The new value of the expression, 1938 * after applying the modifier, never NULL */ 1939 char missing_delim; /* For error reporting */ 1940 1941 char sep; /* Word separator in expansions 1942 * (see the :ts modifier) */ 1943 Boolean oneBigWord; /* TRUE if some modifiers that otherwise split 1944 * the variable value into words, like :S and 1945 * :C, treat the variable value as a single big 1946 * word, possibly containing spaces. */ 1947 } ApplyModifiersState; 1948 1949 typedef enum { 1950 AMR_OK, /* Continue parsing */ 1951 AMR_UNKNOWN, /* Not a match, try other modifiers as well */ 1952 AMR_BAD, /* Error out with "Bad modifier" message */ 1953 AMR_CLEANUP /* Error out, with "Unfinished modifier" 1954 * if st->missing_delim is set. */ 1955 } ApplyModifierResult; 1956 1957 /* Test whether mod starts with modname, followed by a delimiter. */ 1958 static Boolean 1959 ModMatch(const char *mod, const char *modname, char endc) 1960 { 1961 size_t n = strlen(modname); 1962 return strncmp(mod, modname, n) == 0 && 1963 (mod[n] == endc || mod[n] == ':'); 1964 } 1965 1966 /* Test whether mod starts with modname, followed by a delimiter or '='. */ 1967 static inline Boolean 1968 ModMatchEq(const char *mod, const char *modname, char endc) 1969 { 1970 size_t n = strlen(modname); 1971 return strncmp(mod, modname, n) == 0 && 1972 (mod[n] == endc || mod[n] == ':' || mod[n] == '='); 1973 } 1974 1975 /* :@var (at) ...${var}...@ */ 1976 static ApplyModifierResult 1977 ApplyModifier_Loop(const char **pp, ApplyModifiersState *st) 1978 { 1979 ModifyWord_LoopArgs args; 1980 char delim; 1981 char prev_sep; 1982 VarEvalFlags eflags = st->eflags & ~(unsigned)VARE_WANTRES; 1983 1984 args.ctx = st->ctxt; 1985 1986 (*pp)++; /* Skip the first '@' */ 1987 delim = '@'; 1988 args.tvar = ParseModifierPart(pp, delim, eflags, 1989 st->ctxt, NULL, NULL, NULL); 1990 if (args.tvar == NULL) { 1991 st->missing_delim = delim; 1992 return AMR_CLEANUP; 1993 } 1994 if (DEBUG(LINT) && strchr(args.tvar, '$') != NULL) { 1995 Parse_Error(PARSE_FATAL, 1996 "In the :@ modifier of \"%s\", the variable name \"%s\" " 1997 "must not contain a dollar.", 1998 st->v->name, args.tvar); 1999 return AMR_CLEANUP; 2000 } 2001 2002 args.str = ParseModifierPart(pp, delim, eflags, 2003 st->ctxt, NULL, NULL, NULL); 2004 if (args.str == NULL) { 2005 st->missing_delim = delim; 2006 return AMR_CLEANUP; 2007 } 2008 2009 args.eflags = st->eflags & (VARE_UNDEFERR | VARE_WANTRES); 2010 prev_sep = st->sep; 2011 st->sep = ' '; /* XXX: should be st->sep for consistency */ 2012 st->newVal = ModifyWords(st->ctxt, st->sep, st->oneBigWord, st->val, 2013 ModifyWord_Loop, &args); 2014 st->sep = prev_sep; 2015 Var_Delete(args.tvar, st->ctxt); 2016 free(args.tvar); 2017 free(args.str); 2018 return AMR_OK; 2019 } 2020 2021 /* :Ddefined or :Uundefined */ 2022 static ApplyModifierResult 2023 ApplyModifier_Defined(const char **pp, ApplyModifiersState *st) 2024 { 2025 Buffer buf; /* Buffer for patterns */ 2026 const char *p; 2027 2028 VarEvalFlags eflags = st->eflags & ~(unsigned)VARE_WANTRES; 2029 if (st->eflags & VARE_WANTRES) { 2030 if ((**pp == 'D') == !(st->v->flags & VAR_JUNK)) 2031 eflags |= VARE_WANTRES; 2032 } 2033 2034 Buf_Init(&buf, 0); 2035 p = *pp + 1; 2036 while (*p != st->endc && *p != ':' && *p != '\0') { 2037 2038 /* Escaped delimiter or other special character */ 2039 if (*p == '\\') { 2040 char c = p[1]; 2041 if (c == st->endc || c == ':' || c == '$' || c == '\\') { 2042 Buf_AddByte(&buf, c); 2043 p += 2; 2044 continue; 2045 } 2046 } 2047 2048 /* Nested variable expressions */ 2049 if (*p == '$') { 2050 const char *cp2; 2051 int len; 2052 void *freeIt; 2053 2054 cp2 = Var_Parse(p, st->ctxt, eflags, &len, &freeIt); 2055 Buf_AddStr(&buf, cp2); 2056 free(freeIt); 2057 p += len; 2058 continue; 2059 } 2060 2061 /* Ordinary text */ 2062 Buf_AddByte(&buf, *p); 2063 p++; 2064 } 2065 *pp = p; 2066 2067 if (st->v->flags & VAR_JUNK) 2068 st->v->flags |= VAR_KEEP; 2069 if (eflags & VARE_WANTRES) { 2070 st->newVal = Buf_Destroy(&buf, FALSE); 2071 } else { 2072 st->newVal = st->val; 2073 Buf_Destroy(&buf, TRUE); 2074 } 2075 return AMR_OK; 2076 } 2077 2078 /* :gmtime */ 2079 static ApplyModifierResult 2080 ApplyModifier_Gmtime(const char **pp, ApplyModifiersState *st) 2081 { 2082 time_t utc; 2083 2084 const char *mod = *pp; 2085 if (!ModMatchEq(mod, "gmtime", st->endc)) 2086 return AMR_UNKNOWN; 2087 2088 if (mod[6] == '=') { 2089 char *ep; 2090 utc = (time_t)strtoul(mod + 7, &ep, 10); 2091 *pp = ep; 2092 } else { 2093 utc = 0; 2094 *pp = mod + 6; 2095 } 2096 st->newVal = VarStrftime(st->val, TRUE, utc); 2097 return AMR_OK; 2098 } 2099 2100 /* :localtime */ 2101 static Boolean 2102 ApplyModifier_Localtime(const char **pp, ApplyModifiersState *st) 2103 { 2104 time_t utc; 2105 2106 const char *mod = *pp; 2107 if (!ModMatchEq(mod, "localtime", st->endc)) 2108 return AMR_UNKNOWN; 2109 2110 if (mod[9] == '=') { 2111 char *ep; 2112 utc = (time_t)strtoul(mod + 10, &ep, 10); 2113 *pp = ep; 2114 } else { 2115 utc = 0; 2116 *pp = mod + 9; 2117 } 2118 st->newVal = VarStrftime(st->val, FALSE, utc); 2119 return AMR_OK; 2120 } 2121 2122 /* :hash */ 2123 static ApplyModifierResult 2124 ApplyModifier_Hash(const char **pp, ApplyModifiersState *st) 2125 { 2126 if (!ModMatch(*pp, "hash", st->endc)) 2127 return AMR_UNKNOWN; 2128 2129 st->newVal = VarHash(st->val); 2130 *pp += 4; 2131 return AMR_OK; 2132 } 2133 2134 /* :P */ 2135 static ApplyModifierResult 2136 ApplyModifier_Path(const char **pp, ApplyModifiersState *st) 2137 { 2138 GNode *gn; 2139 char *path; 2140 2141 if (st->v->flags & VAR_JUNK) 2142 st->v->flags |= VAR_KEEP; 2143 2144 gn = Targ_FindNode(st->v->name, TARG_NOCREATE); 2145 if (gn == NULL || gn->type & OP_NOPATH) { 2146 path = NULL; 2147 } else if (gn->path) { 2148 path = bmake_strdup(gn->path); 2149 } else { 2150 Lst searchPath = Suff_FindPath(gn); 2151 path = Dir_FindFile(st->v->name, searchPath); 2152 } 2153 if (path == NULL) 2154 path = bmake_strdup(st->v->name); 2155 st->newVal = path; 2156 2157 (*pp)++; 2158 return AMR_OK; 2159 } 2160 2161 /* :!cmd! */ 2162 static ApplyModifierResult 2163 ApplyModifier_Exclam(const char **pp, ApplyModifiersState *st) 2164 { 2165 char delim; 2166 char *cmd; 2167 const char *errfmt; 2168 2169 (*pp)++; 2170 delim = '!'; 2171 cmd = ParseModifierPart(pp, delim, st->eflags, st->ctxt, 2172 NULL, NULL, NULL); 2173 if (cmd == NULL) { 2174 st->missing_delim = delim; 2175 return AMR_CLEANUP; 2176 } 2177 2178 errfmt = NULL; 2179 if (st->eflags & VARE_WANTRES) 2180 st->newVal = Cmd_Exec(cmd, &errfmt); 2181 else 2182 st->newVal = varNoError; 2183 free(cmd); 2184 2185 if (errfmt != NULL) 2186 Error(errfmt, st->val); /* XXX: why still return AMR_OK? */ 2187 2188 if (st->v->flags & VAR_JUNK) 2189 st->v->flags |= VAR_KEEP; 2190 return AMR_OK; 2191 } 2192 2193 /* The :range modifier generates an integer sequence as long as the words. 2194 * The :range=7 modifier generates an integer sequence from 1 to 7. */ 2195 static ApplyModifierResult 2196 ApplyModifier_Range(const char **pp, ApplyModifiersState *st) 2197 { 2198 size_t n; 2199 Buffer buf; 2200 size_t i; 2201 2202 const char *mod = *pp; 2203 if (!ModMatchEq(mod, "range", st->endc)) 2204 return AMR_UNKNOWN; 2205 2206 if (mod[5] == '=') { 2207 char *ep; 2208 n = (size_t)strtoul(mod + 6, &ep, 10); 2209 *pp = ep; 2210 } else { 2211 n = 0; 2212 *pp = mod + 5; 2213 } 2214 2215 if (n == 0) { 2216 char *as; 2217 char **av = brk_string(st->val, FALSE, &n, &as); 2218 free(as); 2219 free(av); 2220 } 2221 2222 Buf_Init(&buf, 0); 2223 2224 for (i = 0; i < n; i++) { 2225 if (i != 0) 2226 Buf_AddByte(&buf, ' '); /* XXX: st->sep, for consistency */ 2227 Buf_AddInt(&buf, 1 + (int)i); 2228 } 2229 2230 st->newVal = Buf_Destroy(&buf, FALSE); 2231 return AMR_OK; 2232 } 2233 2234 /* :Mpattern or :Npattern */ 2235 static ApplyModifierResult 2236 ApplyModifier_Match(const char **pp, ApplyModifiersState *st) 2237 { 2238 const char *mod = *pp; 2239 Boolean copy = FALSE; /* pattern should be, or has been, copied */ 2240 Boolean needSubst = FALSE; 2241 const char *endpat; 2242 char *pattern; 2243 ModifyWordsCallback callback; 2244 2245 /* 2246 * In the loop below, ignore ':' unless we are at (or back to) the 2247 * original brace level. 2248 * XXX This will likely not work right if $() and ${} are intermixed. 2249 */ 2250 int nest = 0; 2251 const char *p; 2252 for (p = mod + 1; *p != '\0' && !(*p == ':' && nest == 0); p++) { 2253 if (*p == '\\' && 2254 (p[1] == ':' || p[1] == st->endc || p[1] == st->startc)) { 2255 if (!needSubst) 2256 copy = TRUE; 2257 p++; 2258 continue; 2259 } 2260 if (*p == '$') 2261 needSubst = TRUE; 2262 if (*p == '(' || *p == '{') 2263 nest++; 2264 if (*p == ')' || *p == '}') { 2265 nest--; 2266 if (nest < 0) 2267 break; 2268 } 2269 } 2270 *pp = p; 2271 endpat = p; 2272 2273 if (copy) { 2274 char *dst; 2275 const char *src; 2276 2277 /* Compress the \:'s out of the pattern. */ 2278 pattern = bmake_malloc((size_t)(endpat - (mod + 1)) + 1); 2279 dst = pattern; 2280 src = mod + 1; 2281 for (; src < endpat; src++, dst++) { 2282 if (src[0] == '\\' && src + 1 < endpat && 2283 /* XXX: st->startc is missing here; see above */ 2284 (src[1] == ':' || src[1] == st->endc)) 2285 src++; 2286 *dst = *src; 2287 } 2288 *dst = '\0'; 2289 endpat = dst; 2290 } else { 2291 /* 2292 * Either Var_Subst or ModifyWords will need a 2293 * nul-terminated string soon, so construct one now. 2294 */ 2295 pattern = bmake_strldup(mod + 1, (size_t)(endpat - (mod + 1))); 2296 } 2297 2298 if (needSubst) { 2299 /* pattern contains embedded '$', so use Var_Subst to expand it. */ 2300 char *old_pattern = pattern; 2301 pattern = Var_Subst(pattern, st->ctxt, st->eflags); 2302 free(old_pattern); 2303 } 2304 2305 VAR_DEBUG("Pattern[%s] for [%s] is [%s]\n", st->v->name, st->val, pattern); 2306 2307 callback = mod[0] == 'M' ? ModifyWord_Match : ModifyWord_NoMatch; 2308 st->newVal = ModifyWords(st->ctxt, st->sep, st->oneBigWord, st->val, 2309 callback, pattern); 2310 free(pattern); 2311 return AMR_OK; 2312 } 2313 2314 /* :S,from,to, */ 2315 static ApplyModifierResult 2316 ApplyModifier_Subst(const char **pp, ApplyModifiersState *st) 2317 { 2318 ModifyWord_SubstArgs args; 2319 char *lhs, *rhs; 2320 Boolean oneBigWord; 2321 2322 char delim = (*pp)[1]; 2323 if (delim == '\0') { 2324 Error("Missing delimiter for :S modifier"); 2325 (*pp)++; 2326 return AMR_CLEANUP; 2327 } 2328 2329 *pp += 2; 2330 2331 args.pflags = 0; 2332 args.matched = FALSE; 2333 2334 /* 2335 * If pattern begins with '^', it is anchored to the 2336 * start of the word -- skip over it and flag pattern. 2337 */ 2338 if (**pp == '^') { 2339 args.pflags |= VARP_ANCHOR_START; 2340 (*pp)++; 2341 } 2342 2343 lhs = ParseModifierPart(pp, delim, st->eflags, st->ctxt, 2344 &args.lhsLen, &args.pflags, NULL); 2345 if (lhs == NULL) { 2346 st->missing_delim = delim; 2347 return AMR_CLEANUP; 2348 } 2349 args.lhs = lhs; 2350 2351 rhs = ParseModifierPart(pp, delim, st->eflags, st->ctxt, 2352 &args.rhsLen, NULL, &args); 2353 if (rhs == NULL) { 2354 st->missing_delim = delim; 2355 return AMR_CLEANUP; 2356 } 2357 args.rhs = rhs; 2358 2359 oneBigWord = st->oneBigWord; 2360 for (;; (*pp)++) { 2361 switch (**pp) { 2362 case 'g': 2363 args.pflags |= VARP_SUB_GLOBAL; 2364 continue; 2365 case '1': 2366 args.pflags |= VARP_SUB_ONE; 2367 continue; 2368 case 'W': 2369 oneBigWord = TRUE; 2370 continue; 2371 } 2372 break; 2373 } 2374 2375 st->newVal = ModifyWords(st->ctxt, st->sep, oneBigWord, st->val, 2376 ModifyWord_Subst, &args); 2377 2378 free(lhs); 2379 free(rhs); 2380 return AMR_OK; 2381 } 2382 2383 #ifndef NO_REGEX 2384 2385 /* :C,from,to, */ 2386 static ApplyModifierResult 2387 ApplyModifier_Regex(const char **pp, ApplyModifiersState *st) 2388 { 2389 char *re; 2390 ModifyWord_SubstRegexArgs args; 2391 Boolean oneBigWord; 2392 int error; 2393 2394 char delim = (*pp)[1]; 2395 if (delim == '\0') { 2396 Error("Missing delimiter for :C modifier"); 2397 (*pp)++; 2398 return AMR_CLEANUP; 2399 } 2400 2401 *pp += 2; 2402 2403 re = ParseModifierPart(pp, delim, st->eflags, st->ctxt, NULL, NULL, NULL); 2404 if (re == NULL) { 2405 st->missing_delim = delim; 2406 return AMR_CLEANUP; 2407 } 2408 2409 args.replace = ParseModifierPart(pp, delim, st->eflags, st->ctxt, 2410 NULL, NULL, NULL); 2411 if (args.replace == NULL) { 2412 free(re); 2413 st->missing_delim = delim; 2414 return AMR_CLEANUP; 2415 } 2416 2417 args.pflags = 0; 2418 args.matched = FALSE; 2419 oneBigWord = st->oneBigWord; 2420 for (;; (*pp)++) { 2421 switch (**pp) { 2422 case 'g': 2423 args.pflags |= VARP_SUB_GLOBAL; 2424 continue; 2425 case '1': 2426 args.pflags |= VARP_SUB_ONE; 2427 continue; 2428 case 'W': 2429 oneBigWord = TRUE; 2430 continue; 2431 } 2432 break; 2433 } 2434 2435 error = regcomp(&args.re, re, REG_EXTENDED); 2436 free(re); 2437 if (error) { 2438 VarREError(error, &args.re, "Regex compilation error"); 2439 free(args.replace); 2440 return AMR_CLEANUP; 2441 } 2442 2443 args.nsub = args.re.re_nsub + 1; 2444 if (args.nsub < 1) 2445 args.nsub = 1; 2446 if (args.nsub > 10) 2447 args.nsub = 10; 2448 st->newVal = ModifyWords(st->ctxt, st->sep, oneBigWord, st->val, 2449 ModifyWord_SubstRegex, &args); 2450 regfree(&args.re); 2451 free(args.replace); 2452 return AMR_OK; 2453 } 2454 #endif 2455 2456 static void 2457 ModifyWord_Copy(const char *word, SepBuf *buf, void *data MAKE_ATTR_UNUSED) 2458 { 2459 SepBuf_AddStr(buf, word); 2460 } 2461 2462 /* :ts<separator> */ 2463 static ApplyModifierResult 2464 ApplyModifier_ToSep(const char **pp, ApplyModifiersState *st) 2465 { 2466 /* XXX: pp points to the 's', for historic reasons only. 2467 * Changing this will influence the error messages. */ 2468 const char *sep = *pp + 1; 2469 if (sep[0] != st->endc && (sep[1] == st->endc || sep[1] == ':')) { 2470 /* ":ts<any><endc>" or ":ts<any>:" */ 2471 st->sep = sep[0]; 2472 *pp = sep + 1; 2473 } else if (sep[0] == st->endc || sep[0] == ':') { 2474 /* ":ts<endc>" or ":ts:" */ 2475 st->sep = '\0'; /* no separator */ 2476 *pp = sep; 2477 } else if (sep[0] == '\\') { 2478 const char *xp = sep + 1; 2479 int base = 8; /* assume octal */ 2480 2481 switch (sep[1]) { 2482 case 'n': 2483 st->sep = '\n'; 2484 *pp = sep + 2; 2485 break; 2486 case 't': 2487 st->sep = '\t'; 2488 *pp = sep + 2; 2489 break; 2490 case 'x': 2491 base = 16; 2492 xp++; 2493 goto get_numeric; 2494 case '0': 2495 base = 0; 2496 goto get_numeric; 2497 default: 2498 if (!isdigit((unsigned char)sep[1])) 2499 return AMR_BAD; /* ":ts<backslash><unrecognised>". */ 2500 2501 get_numeric: 2502 { 2503 char *end; 2504 st->sep = (char)strtoul(xp, &end, base); 2505 if (*end != ':' && *end != st->endc) 2506 return AMR_BAD; 2507 *pp = end; 2508 } 2509 break; 2510 } 2511 } else { 2512 return AMR_BAD; /* Found ":ts<unrecognised><unrecognised>". */ 2513 } 2514 2515 st->newVal = ModifyWords(st->ctxt, st->sep, st->oneBigWord, st->val, 2516 ModifyWord_Copy, NULL); 2517 return AMR_OK; 2518 } 2519 2520 /* :tA, :tu, :tl, :ts<separator>, etc. */ 2521 static ApplyModifierResult 2522 ApplyModifier_To(const char **pp, ApplyModifiersState *st) 2523 { 2524 const char *mod = *pp; 2525 assert(mod[0] == 't'); 2526 2527 *pp = mod + 1; /* make sure it is set */ 2528 if (mod[1] == st->endc || mod[1] == ':' || mod[1] == '\0') 2529 return AMR_BAD; /* Found ":t<endc>" or ":t:". */ 2530 2531 if (mod[1] == 's') 2532 return ApplyModifier_ToSep(pp, st); 2533 2534 if (mod[2] != st->endc && mod[2] != ':') 2535 return AMR_BAD; /* Found ":t<unrecognised><unrecognised>". */ 2536 2537 /* Check for two-character options: ":tu", ":tl" */ 2538 if (mod[1] == 'A') { /* absolute path */ 2539 st->newVal = ModifyWords(st->ctxt, st->sep, st->oneBigWord, st->val, 2540 ModifyWord_Realpath, NULL); 2541 *pp = mod + 2; 2542 } else if (mod[1] == 'u') { 2543 size_t i; 2544 size_t len = strlen(st->val); 2545 st->newVal = bmake_malloc(len + 1); 2546 for (i = 0; i < len + 1; i++) 2547 st->newVal[i] = (char)toupper((unsigned char)st->val[i]); 2548 *pp = mod + 2; 2549 } else if (mod[1] == 'l') { 2550 size_t i; 2551 size_t len = strlen(st->val); 2552 st->newVal = bmake_malloc(len + 1); 2553 for (i = 0; i < len + 1; i++) 2554 st->newVal[i] = (char)tolower((unsigned char)st->val[i]); 2555 *pp = mod + 2; 2556 } else if (mod[1] == 'W' || mod[1] == 'w') { 2557 st->oneBigWord = mod[1] == 'W'; 2558 st->newVal = st->val; 2559 *pp = mod + 2; 2560 } else { 2561 /* Found ":t<unrecognised>:" or ":t<unrecognised><endc>". */ 2562 return AMR_BAD; 2563 } 2564 return AMR_OK; 2565 } 2566 2567 /* :[#], :[1], etc. */ 2568 static ApplyModifierResult 2569 ApplyModifier_Words(const char **pp, ApplyModifiersState *st) 2570 { 2571 char delim; 2572 char *estr; 2573 char *ep; 2574 int first, last; 2575 2576 (*pp)++; /* skip the '[' */ 2577 delim = ']'; /* look for closing ']' */ 2578 estr = ParseModifierPart(pp, delim, st->eflags, st->ctxt, 2579 NULL, NULL, NULL); 2580 if (estr == NULL) { 2581 st->missing_delim = delim; 2582 return AMR_CLEANUP; 2583 } 2584 2585 /* now *pp points just after the closing ']' */ 2586 if (**pp != ':' && **pp != st->endc) 2587 goto bad_modifier; /* Found junk after ']' */ 2588 2589 if (estr[0] == '\0') 2590 goto bad_modifier; /* empty square brackets in ":[]". */ 2591 2592 if (estr[0] == '#' && estr[1] == '\0') { /* Found ":[#]" */ 2593 if (st->oneBigWord) { 2594 st->newVal = bmake_strdup("1"); 2595 } else { 2596 Buffer buf; 2597 2598 /* XXX: brk_string() is a rather expensive 2599 * way of counting words. */ 2600 char *as; 2601 size_t ac; 2602 char **av = brk_string(st->val, FALSE, &ac, &as); 2603 free(as); 2604 free(av); 2605 2606 Buf_Init(&buf, 4); /* 3 digits + '\0' */ 2607 Buf_AddInt(&buf, (int)ac); 2608 st->newVal = Buf_Destroy(&buf, FALSE); 2609 } 2610 goto ok; 2611 } 2612 2613 if (estr[0] == '*' && estr[1] == '\0') { 2614 /* Found ":[*]" */ 2615 st->oneBigWord = TRUE; 2616 st->newVal = st->val; 2617 goto ok; 2618 } 2619 2620 if (estr[0] == '@' && estr[1] == '\0') { 2621 /* Found ":[@]" */ 2622 st->oneBigWord = FALSE; 2623 st->newVal = st->val; 2624 goto ok; 2625 } 2626 2627 /* 2628 * We expect estr to contain a single integer for :[N], or two integers 2629 * separated by ".." for :[start..end]. 2630 */ 2631 first = (int)strtol(estr, &ep, 0); 2632 if (ep == estr) /* Found junk instead of a number */ 2633 goto bad_modifier; 2634 2635 if (ep[0] == '\0') { /* Found only one integer in :[N] */ 2636 last = first; 2637 } else if (ep[0] == '.' && ep[1] == '.' && ep[2] != '\0') { 2638 /* Expecting another integer after ".." */ 2639 ep += 2; 2640 last = (int)strtol(ep, &ep, 0); 2641 if (ep[0] != '\0') /* Found junk after ".." */ 2642 goto bad_modifier; 2643 } else 2644 goto bad_modifier; /* Found junk instead of ".." */ 2645 2646 /* 2647 * Now seldata is properly filled in, but we still have to check for 0 as 2648 * a special case. 2649 */ 2650 if (first == 0 && last == 0) { 2651 /* ":[0]" or perhaps ":[0..0]" */ 2652 st->oneBigWord = TRUE; 2653 st->newVal = st->val; 2654 goto ok; 2655 } 2656 2657 /* ":[0..N]" or ":[N..0]" */ 2658 if (first == 0 || last == 0) 2659 goto bad_modifier; 2660 2661 /* Normal case: select the words described by seldata. */ 2662 st->newVal = VarSelectWords(st->sep, st->oneBigWord, st->val, first, last); 2663 2664 ok: 2665 free(estr); 2666 return AMR_OK; 2667 2668 bad_modifier: 2669 free(estr); 2670 return AMR_BAD; 2671 } 2672 2673 static int 2674 str_cmp_asc(const void *a, const void *b) 2675 { 2676 return strcmp(*(const char * const *)a, *(const char * const *)b); 2677 } 2678 2679 static int 2680 str_cmp_desc(const void *a, const void *b) 2681 { 2682 return strcmp(*(const char * const *)b, *(const char * const *)a); 2683 } 2684 2685 /* :O (order ascending) or :Or (order descending) or :Ox (shuffle) */ 2686 static ApplyModifierResult 2687 ApplyModifier_Order(const char **pp, ApplyModifiersState *st) 2688 { 2689 const char *mod = (*pp)++; /* skip past the 'O' in any case */ 2690 2691 char *as; /* word list memory */ 2692 size_t ac; 2693 char **av = brk_string(st->val, FALSE, &ac, &as); 2694 2695 if (mod[1] == st->endc || mod[1] == ':') { 2696 /* :O sorts ascending */ 2697 qsort(av, ac, sizeof(char *), str_cmp_asc); 2698 2699 } else if ((mod[1] == 'r' || mod[1] == 'x') && 2700 (mod[2] == st->endc || mod[2] == ':')) { 2701 (*pp)++; 2702 2703 if (mod[1] == 'r') { 2704 /* :Or sorts descending */ 2705 qsort(av, ac, sizeof(char *), str_cmp_desc); 2706 2707 } else { 2708 /* :Ox shuffles 2709 * 2710 * We will use [ac..2] range for mod factors. This will produce 2711 * random numbers in [(ac-1)..0] interval, and minimal 2712 * reasonable value for mod factor is 2 (the mod 1 will produce 2713 * 0 with probability 1). 2714 */ 2715 size_t i; 2716 for (i = ac - 1; i > 0; i--) { 2717 size_t rndidx = (size_t)random() % (i + 1); 2718 char *t = av[i]; 2719 av[i] = av[rndidx]; 2720 av[rndidx] = t; 2721 } 2722 } 2723 } else { 2724 free(as); 2725 free(av); 2726 return AMR_BAD; 2727 } 2728 2729 st->newVal = WordList_JoinFree(av, ac, as); 2730 return AMR_OK; 2731 } 2732 2733 /* :? then : else */ 2734 static ApplyModifierResult 2735 ApplyModifier_IfElse(const char **pp, ApplyModifiersState *st) 2736 { 2737 char delim; 2738 char *then_expr, *else_expr; 2739 2740 Boolean value = FALSE; 2741 VarEvalFlags then_eflags = st->eflags & ~(unsigned)VARE_WANTRES; 2742 VarEvalFlags else_eflags = st->eflags & ~(unsigned)VARE_WANTRES; 2743 2744 int cond_rc = COND_PARSE; /* anything other than COND_INVALID */ 2745 if (st->eflags & VARE_WANTRES) { 2746 cond_rc = Cond_EvalExpression(NULL, st->v->name, &value, 0, FALSE); 2747 if (cond_rc != COND_INVALID && value) 2748 then_eflags |= VARE_WANTRES; 2749 if (cond_rc != COND_INVALID && !value) 2750 else_eflags |= VARE_WANTRES; 2751 } 2752 2753 (*pp)++; /* skip past the '?' */ 2754 delim = ':'; 2755 then_expr = ParseModifierPart(pp, delim, then_eflags, st->ctxt, 2756 NULL, NULL, NULL); 2757 if (then_expr == NULL) { 2758 st->missing_delim = delim; 2759 return AMR_CLEANUP; 2760 } 2761 2762 delim = st->endc; /* BRCLOSE or PRCLOSE */ 2763 else_expr = ParseModifierPart(pp, delim, else_eflags, st->ctxt, 2764 NULL, NULL, NULL); 2765 if (else_expr == NULL) { 2766 st->missing_delim = delim; 2767 return AMR_CLEANUP; 2768 } 2769 2770 (*pp)--; 2771 if (cond_rc == COND_INVALID) { 2772 Error("Bad conditional expression `%s' in %s?%s:%s", 2773 st->v->name, st->v->name, then_expr, else_expr); 2774 return AMR_CLEANUP; 2775 } 2776 2777 if (value) { 2778 st->newVal = then_expr; 2779 free(else_expr); 2780 } else { 2781 st->newVal = else_expr; 2782 free(then_expr); 2783 } 2784 if (st->v->flags & VAR_JUNK) 2785 st->v->flags |= VAR_KEEP; 2786 return AMR_OK; 2787 } 2788 2789 /* 2790 * The ::= modifiers actually assign a value to the variable. 2791 * Their main purpose is in supporting modifiers of .for loop 2792 * iterators and other obscure uses. They always expand to 2793 * nothing. In a target rule that would otherwise expand to an 2794 * empty line they can be preceded with @: to keep make happy. 2795 * Eg. 2796 * 2797 * foo: .USE 2798 * .for i in ${.TARGET} ${.TARGET:R}.gz 2799 * @: ${t::=$i} 2800 * @echo blah ${t:T} 2801 * .endfor 2802 * 2803 * ::=<str> Assigns <str> as the new value of variable. 2804 * ::?=<str> Assigns <str> as value of variable if 2805 * it was not already set. 2806 * ::+=<str> Appends <str> to variable. 2807 * ::!=<cmd> Assigns output of <cmd> as the new value of 2808 * variable. 2809 */ 2810 static ApplyModifierResult 2811 ApplyModifier_Assign(const char **pp, ApplyModifiersState *st) 2812 { 2813 GNode *v_ctxt; 2814 char *sv_name; 2815 char delim; 2816 char *val; 2817 2818 const char *mod = *pp; 2819 const char *op = mod + 1; 2820 if (!(op[0] == '=' || 2821 (op[1] == '=' && 2822 (op[0] == '!' || op[0] == '+' || op[0] == '?')))) 2823 return AMR_UNKNOWN; /* "::<unrecognised>" */ 2824 2825 2826 if (st->v->name[0] == 0) { 2827 *pp = mod + 1; 2828 return AMR_BAD; 2829 } 2830 2831 v_ctxt = st->ctxt; /* context where v belongs */ 2832 sv_name = NULL; 2833 if (st->v->flags & VAR_JUNK) { 2834 /* 2835 * We need to bmake_strdup() it in case ParseModifierPart() recurses. 2836 */ 2837 sv_name = st->v->name; 2838 st->v->name = bmake_strdup(st->v->name); 2839 } else if (st->ctxt != VAR_GLOBAL) { 2840 Var *gv = VarFind(st->v->name, st->ctxt, 0); 2841 if (gv == NULL) 2842 v_ctxt = VAR_GLOBAL; 2843 else 2844 VarFreeEnv(gv, TRUE); 2845 } 2846 2847 switch (op[0]) { 2848 case '+': 2849 case '?': 2850 case '!': 2851 *pp = mod + 3; 2852 break; 2853 default: 2854 *pp = mod + 2; 2855 break; 2856 } 2857 2858 delim = st->startc == PROPEN ? PRCLOSE : BRCLOSE; 2859 val = ParseModifierPart(pp, delim, st->eflags, st->ctxt, NULL, NULL, NULL); 2860 if (st->v->flags & VAR_JUNK) { 2861 /* restore original name */ 2862 free(st->v->name); 2863 st->v->name = sv_name; 2864 } 2865 if (val == NULL) { 2866 st->missing_delim = delim; 2867 return AMR_CLEANUP; 2868 } 2869 2870 (*pp)--; 2871 2872 if (st->eflags & VARE_WANTRES) { 2873 switch (op[0]) { 2874 case '+': 2875 Var_Append(st->v->name, val, v_ctxt); 2876 break; 2877 case '!': { 2878 const char *errfmt; 2879 char *cmd_output = Cmd_Exec(val, &errfmt); 2880 if (errfmt) 2881 Error(errfmt, st->val); 2882 else 2883 Var_Set(st->v->name, cmd_output, v_ctxt); 2884 free(cmd_output); 2885 break; 2886 } 2887 case '?': 2888 if (!(st->v->flags & VAR_JUNK)) 2889 break; 2890 /* FALLTHROUGH */ 2891 default: 2892 Var_Set(st->v->name, val, v_ctxt); 2893 break; 2894 } 2895 } 2896 free(val); 2897 st->newVal = varNoError; 2898 return AMR_OK; 2899 } 2900 2901 /* remember current value */ 2902 static ApplyModifierResult 2903 ApplyModifier_Remember(const char **pp, ApplyModifiersState *st) 2904 { 2905 const char *mod = *pp; 2906 if (!ModMatchEq(mod, "_", st->endc)) 2907 return AMR_UNKNOWN; 2908 2909 if (mod[1] == '=') { 2910 size_t n = strcspn(mod + 2, ":)}"); 2911 char *name = bmake_strldup(mod + 2, n); 2912 Var_Set(name, st->val, st->ctxt); 2913 free(name); 2914 *pp = mod + 2 + n; 2915 } else { 2916 Var_Set("_", st->val, st->ctxt); 2917 *pp = mod + 1; 2918 } 2919 st->newVal = st->val; 2920 return AMR_OK; 2921 } 2922 2923 /* Apply the given function to each word of the variable value. */ 2924 static ApplyModifierResult 2925 ApplyModifier_WordFunc(const char **pp, ApplyModifiersState *st, 2926 ModifyWordsCallback modifyWord) 2927 { 2928 char delim = (*pp)[1]; 2929 if (delim != st->endc && delim != ':') 2930 return AMR_UNKNOWN; 2931 2932 st->newVal = ModifyWords(st->ctxt, st->sep, st->oneBigWord, 2933 st->val, modifyWord, NULL); 2934 (*pp)++; 2935 return AMR_OK; 2936 } 2937 2938 #ifdef SYSVVARSUB 2939 /* :from=to */ 2940 static ApplyModifierResult 2941 ApplyModifier_SysV(const char **pp, ApplyModifiersState *st) 2942 { 2943 char delim; 2944 char *lhs, *rhs; 2945 2946 const char *mod = *pp; 2947 Boolean eqFound = FALSE; 2948 2949 /* 2950 * First we make a pass through the string trying 2951 * to verify it is a SYSV-make-style translation: 2952 * it must be: <string1>=<string2>) 2953 */ 2954 int nest = 1; 2955 const char *next = mod; 2956 while (*next != '\0' && nest > 0) { 2957 if (*next == '=') { 2958 eqFound = TRUE; 2959 /* continue looking for st->endc */ 2960 } else if (*next == st->endc) 2961 nest--; 2962 else if (*next == st->startc) 2963 nest++; 2964 if (nest > 0) 2965 next++; 2966 } 2967 if (*next != st->endc || !eqFound) 2968 return AMR_UNKNOWN; 2969 2970 delim = '='; 2971 *pp = mod; 2972 lhs = ParseModifierPart(pp, delim, st->eflags, st->ctxt, NULL, NULL, NULL); 2973 if (lhs == NULL) { 2974 st->missing_delim = delim; 2975 return AMR_CLEANUP; 2976 } 2977 2978 delim = st->endc; 2979 rhs = ParseModifierPart(pp, delim, st->eflags, st->ctxt, NULL, NULL, NULL); 2980 if (rhs == NULL) { 2981 st->missing_delim = delim; 2982 return AMR_CLEANUP; 2983 } 2984 2985 /* 2986 * SYSV modifications happen through the whole 2987 * string. Note the pattern is anchored at the end. 2988 */ 2989 (*pp)--; 2990 if (lhs[0] == '\0' && *st->val == '\0') { 2991 st->newVal = st->val; /* special case */ 2992 } else { 2993 ModifyWord_SYSVSubstArgs args = {st->ctxt, lhs, rhs}; 2994 st->newVal = ModifyWords(st->ctxt, st->sep, st->oneBigWord, st->val, 2995 ModifyWord_SYSVSubst, &args); 2996 } 2997 free(lhs); 2998 free(rhs); 2999 return AMR_OK; 3000 } 3001 #endif 3002 3003 /* Apply any modifiers (such as :Mpattern or :@var@loop@ or :Q or ::=value). */ 3004 static char * 3005 ApplyModifiers( 3006 const char **pp, /* the parsing position, updated upon return */ 3007 char *val, /* the current value of the variable */ 3008 char const startc, /* '(' or '{', or '\0' for indirect modifiers */ 3009 char const endc, /* ')' or '}', or '\0' for indirect modifiers */ 3010 Var * const v, /* the variable may have its flags changed */ 3011 GNode * const ctxt, /* for looking up and modifying variables */ 3012 VarEvalFlags const eflags, 3013 void ** const freePtr /* free this after using the return value */ 3014 ) { 3015 ApplyModifiersState st = { 3016 startc, endc, v, ctxt, eflags, val, 3017 var_Error, /* .newVal */ 3018 '\0', /* .missing_delim */ 3019 ' ', /* .sep */ 3020 FALSE /* .oneBigWord */ 3021 }; 3022 const char *p; 3023 const char *mod; 3024 ApplyModifierResult res; 3025 3026 assert(startc == '(' || startc == '{' || startc == '\0'); 3027 assert(endc == ')' || endc == '}' || endc == '\0'); 3028 assert(val != NULL); 3029 3030 p = *pp; 3031 while (*p != '\0' && *p != endc) { 3032 3033 if (*p == '$') { 3034 /* 3035 * We may have some complex modifiers in a variable. 3036 */ 3037 int rlen; 3038 void *freeIt; 3039 const char *rval = Var_Parse(p, st.ctxt, st.eflags, &rlen, &freeIt); 3040 3041 /* 3042 * If we have not parsed up to st.endc or ':', 3043 * we are not interested. 3044 */ 3045 int c; 3046 assert(rval != NULL); 3047 if (rval[0] != '\0' && 3048 (c = p[rlen]) != '\0' && c != ':' && c != st.endc) { 3049 free(freeIt); 3050 goto apply_mods; 3051 } 3052 3053 VAR_DEBUG("Indirect modifier \"%s\" from \"%.*s\"\n", 3054 rval, rlen, p); 3055 3056 p += rlen; 3057 3058 if (rval[0] != '\0') { 3059 const char *rval_pp = rval; 3060 st.val = ApplyModifiers(&rval_pp, st.val, '\0', '\0', v, 3061 ctxt, eflags, freePtr); 3062 if (st.val == var_Error 3063 || (st.val == varNoError && !(st.eflags & VARE_UNDEFERR)) 3064 || *rval_pp != '\0') { 3065 free(freeIt); 3066 goto out; /* error already reported */ 3067 } 3068 } 3069 free(freeIt); 3070 if (*p == ':') 3071 p++; 3072 else if (*p == '\0' && endc != '\0') { 3073 Error("Unclosed variable specification after complex " 3074 "modifier (expecting '%c') for %s", st.endc, st.v->name); 3075 goto out; 3076 } 3077 continue; 3078 } 3079 apply_mods: 3080 st.newVal = var_Error; /* default value, in case of errors */ 3081 res = AMR_BAD; /* just a safe fallback */ 3082 mod = p; 3083 3084 if (DEBUG(VAR)) { 3085 char eflags_str[VarEvalFlags_ToStringSize]; 3086 char vflags_str[VarFlags_ToStringSize]; 3087 Boolean is_single_char = mod[0] != '\0' && 3088 (mod[1] == endc || mod[1] == ':'); 3089 3090 /* At this point, only the first character of the modifier can 3091 * be used since the end of the modifier is not yet known. */ 3092 VAR_DEBUG("Applying ${%s:%c%s} to \"%s\" " 3093 "(eflags = %s, vflags = %s)\n", 3094 st.v->name, mod[0], is_single_char ? "" : "...", st.val, 3095 Enum_ToString(eflags_str, sizeof eflags_str, st.eflags, 3096 VarEvalFlags_ToStringSpecs), 3097 Enum_ToString(vflags_str, sizeof vflags_str, st.v->flags, 3098 VarFlags_ToStringSpecs)); 3099 } 3100 3101 switch (*mod) { 3102 case ':': 3103 res = ApplyModifier_Assign(&p, &st); 3104 break; 3105 case '@': 3106 res = ApplyModifier_Loop(&p, &st); 3107 break; 3108 case '_': 3109 res = ApplyModifier_Remember(&p, &st); 3110 break; 3111 case 'D': 3112 case 'U': 3113 res = ApplyModifier_Defined(&p, &st); 3114 break; 3115 case 'L': 3116 if (st.v->flags & VAR_JUNK) 3117 st.v->flags |= VAR_KEEP; 3118 st.newVal = bmake_strdup(st.v->name); 3119 p++; 3120 res = AMR_OK; 3121 break; 3122 case 'P': 3123 res = ApplyModifier_Path(&p, &st); 3124 break; 3125 case '!': 3126 res = ApplyModifier_Exclam(&p, &st); 3127 break; 3128 case '[': 3129 res = ApplyModifier_Words(&p, &st); 3130 break; 3131 case 'g': 3132 res = ApplyModifier_Gmtime(&p, &st); 3133 break; 3134 case 'h': 3135 res = ApplyModifier_Hash(&p, &st); 3136 break; 3137 case 'l': 3138 res = ApplyModifier_Localtime(&p, &st); 3139 break; 3140 case 't': 3141 res = ApplyModifier_To(&p, &st); 3142 break; 3143 case 'N': 3144 case 'M': 3145 res = ApplyModifier_Match(&p, &st); 3146 break; 3147 case 'S': 3148 res = ApplyModifier_Subst(&p, &st); 3149 break; 3150 case '?': 3151 res = ApplyModifier_IfElse(&p, &st); 3152 break; 3153 #ifndef NO_REGEX 3154 case 'C': 3155 res = ApplyModifier_Regex(&p, &st); 3156 break; 3157 #endif 3158 case 'q': 3159 case 'Q': 3160 if (p[1] == st.endc || p[1] == ':') { 3161 st.newVal = VarQuote(st.val, *mod == 'q'); 3162 p++; 3163 res = AMR_OK; 3164 } else 3165 res = AMR_UNKNOWN; 3166 break; 3167 case 'T': 3168 res = ApplyModifier_WordFunc(&p, &st, ModifyWord_Tail); 3169 break; 3170 case 'H': 3171 res = ApplyModifier_WordFunc(&p, &st, ModifyWord_Head); 3172 break; 3173 case 'E': 3174 res = ApplyModifier_WordFunc(&p, &st, ModifyWord_Suffix); 3175 break; 3176 case 'R': 3177 res = ApplyModifier_WordFunc(&p, &st, ModifyWord_Root); 3178 break; 3179 case 'r': 3180 res = ApplyModifier_Range(&p, &st); 3181 break; 3182 case 'O': 3183 res = ApplyModifier_Order(&p, &st); 3184 break; 3185 case 'u': 3186 if (p[1] == st.endc || p[1] == ':') { 3187 st.newVal = VarUniq(st.val); 3188 p++; 3189 res = AMR_OK; 3190 } else 3191 res = AMR_UNKNOWN; 3192 break; 3193 #ifdef SUNSHCMD 3194 case 's': 3195 if (p[1] == 'h' && (p[2] == st.endc || p[2] == ':')) { 3196 if (st.eflags & VARE_WANTRES) { 3197 const char *errfmt; 3198 st.newVal = Cmd_Exec(st.val, &errfmt); 3199 if (errfmt) 3200 Error(errfmt, st.val); 3201 } else 3202 st.newVal = varNoError; 3203 p += 2; 3204 res = AMR_OK; 3205 } else 3206 res = AMR_UNKNOWN; 3207 break; 3208 #endif 3209 default: 3210 res = AMR_UNKNOWN; 3211 } 3212 3213 #ifdef SYSVVARSUB 3214 if (res == AMR_UNKNOWN) { 3215 assert(p == mod); 3216 res = ApplyModifier_SysV(&p, &st); 3217 } 3218 #endif 3219 3220 if (res == AMR_UNKNOWN) { 3221 Error("Unknown modifier '%c'", *mod); 3222 for (p++; *p != ':' && *p != st.endc && *p != '\0'; p++) 3223 continue; 3224 st.newVal = var_Error; 3225 } 3226 if (res == AMR_CLEANUP) 3227 goto cleanup; 3228 if (res == AMR_BAD) 3229 goto bad_modifier; 3230 3231 if (DEBUG(VAR)) { 3232 char eflags_str[VarEvalFlags_ToStringSize]; 3233 char vflags_str[VarFlags_ToStringSize]; 3234 const char *quot = st.newVal == var_Error ? "" : "\""; 3235 const char *newVal = st.newVal == var_Error ? "error" : st.newVal; 3236 3237 VAR_DEBUG("Result of ${%s:%.*s} is %s%s%s " 3238 "(eflags = %s, vflags = %s)\n", 3239 st.v->name, (int)(p - mod), mod, quot, newVal, quot, 3240 Enum_ToString(eflags_str, sizeof eflags_str, st.eflags, 3241 VarEvalFlags_ToStringSpecs), 3242 Enum_ToString(vflags_str, sizeof vflags_str, st.v->flags, 3243 VarFlags_ToStringSpecs)); 3244 } 3245 3246 if (st.newVal != st.val) { 3247 if (*freePtr) { 3248 free(st.val); 3249 *freePtr = NULL; 3250 } 3251 st.val = st.newVal; 3252 if (st.val != var_Error && st.val != varNoError) { 3253 *freePtr = st.val; 3254 } 3255 } 3256 if (*p == '\0' && st.endc != '\0') { 3257 Error("Unclosed variable specification (expecting '%c') " 3258 "for \"%s\" (value \"%s\") modifier %c", 3259 st.endc, st.v->name, st.val, *mod); 3260 } else if (*p == ':') { 3261 p++; 3262 } 3263 mod = p; 3264 } 3265 out: 3266 *pp = p; 3267 assert(st.val != NULL); /* Use var_Error or varNoError instead. */ 3268 return st.val; 3269 3270 bad_modifier: 3271 Error("Bad modifier `:%.*s' for %s", 3272 (int)strcspn(mod, ":)}"), mod, st.v->name); 3273 3274 cleanup: 3275 *pp = p; 3276 if (st.missing_delim != '\0') 3277 Error("Unfinished modifier for %s ('%c' missing)", 3278 st.v->name, st.missing_delim); 3279 free(*freePtr); 3280 *freePtr = NULL; 3281 return var_Error; 3282 } 3283 3284 static Boolean 3285 VarIsDynamic(GNode *ctxt, const char *varname, size_t namelen) 3286 { 3287 if ((namelen == 1 || 3288 (namelen == 2 && (varname[1] == 'F' || varname[1] == 'D'))) && 3289 (ctxt == VAR_CMD || ctxt == VAR_GLOBAL)) 3290 { 3291 /* 3292 * If substituting a local variable in a non-local context, 3293 * assume it's for dynamic source stuff. We have to handle 3294 * this specially and return the longhand for the variable 3295 * with the dollar sign escaped so it makes it back to the 3296 * caller. Only four of the local variables are treated 3297 * specially as they are the only four that will be set 3298 * when dynamic sources are expanded. 3299 */ 3300 switch (varname[0]) { 3301 case '@': 3302 case '%': 3303 case '*': 3304 case '!': 3305 return TRUE; 3306 } 3307 return FALSE; 3308 } 3309 3310 if ((namelen == 7 || namelen == 8) && varname[0] == '.' && 3311 isupper((unsigned char)varname[1]) && 3312 (ctxt == VAR_CMD || ctxt == VAR_GLOBAL)) 3313 { 3314 return strcmp(varname, ".TARGET") == 0 || 3315 strcmp(varname, ".ARCHIVE") == 0 || 3316 strcmp(varname, ".PREFIX") == 0 || 3317 strcmp(varname, ".MEMBER") == 0; 3318 } 3319 3320 return FALSE; 3321 } 3322 3323 /*- 3324 *----------------------------------------------------------------------- 3325 * Var_Parse -- 3326 * Given the start of a variable invocation (such as $v, $(VAR), 3327 * ${VAR:Mpattern}), extract the variable name, possibly some 3328 * modifiers and find its value by applying the modifiers to the 3329 * original value. 3330 * 3331 * Input: 3332 * str The string to parse 3333 * ctxt The context for the variable 3334 * flags VARE_UNDEFERR if undefineds are an error 3335 * VARE_WANTRES if we actually want the result 3336 * VARE_ASSIGN if we are in a := assignment 3337 * lengthPtr OUT: The length of the specification 3338 * freePtr OUT: Non-NULL if caller should free *freePtr 3339 * 3340 * Results: 3341 * Returns the value of the variable expression. 3342 * var_Error if there was a parse error and VARE_UNDEFERR was set. 3343 * varNoError if there was a parse error and VARE_UNDEFERR was not set. 3344 * 3345 * Parsing should continue at str + *lengthPtr. 3346 * 3347 * After using the returned value, *freePtr must be freed, preferably 3348 * using bmake_free since it is NULL in most cases. 3349 * 3350 * Side Effects: 3351 * Any effects from the modifiers, such as :!cmd! or ::=value. 3352 *----------------------------------------------------------------------- 3353 */ 3354 /* coverity[+alloc : arg-*4] */ 3355 const char * 3356 Var_Parse(const char * const str, GNode *ctxt, VarEvalFlags eflags, 3357 int *lengthPtr, void **freePtr) 3358 { 3359 const char *tstr; /* Pointer into str */ 3360 Boolean haveModifier; /* TRUE if have modifiers for the variable */ 3361 char startc; /* Starting character if variable in parens 3362 * or braces */ 3363 char endc; /* Ending character if variable in parens 3364 * or braces */ 3365 Boolean dynamic; /* TRUE if the variable is local and we're 3366 * expanding it in a non-local context. This 3367 * is done to support dynamic sources. The 3368 * result is just the invocation, unaltered */ 3369 const char *extramodifiers; 3370 Var *v; 3371 char *nstr; 3372 char eflags_str[VarEvalFlags_ToStringSize]; 3373 3374 VAR_DEBUG("%s: %s with %s\n", __func__, str, 3375 Enum_ToString(eflags_str, sizeof eflags_str, eflags, 3376 VarEvalFlags_ToStringSpecs)); 3377 3378 *freePtr = NULL; 3379 extramodifiers = NULL; /* extra modifiers to apply first */ 3380 dynamic = FALSE; 3381 3382 startc = str[1]; 3383 if (startc != PROPEN && startc != BROPEN) { 3384 char name[2]; 3385 3386 /* 3387 * If it's not bounded by braces of some sort, life is much simpler. 3388 * We just need to check for the first character and return the 3389 * value if it exists. 3390 */ 3391 3392 /* Error out some really stupid names */ 3393 if (startc == '\0' || strchr(")}:$", startc)) { 3394 *lengthPtr = 1; 3395 return var_Error; 3396 } 3397 3398 name[0] = startc; 3399 name[1] = '\0'; 3400 v = VarFind(name, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD); 3401 if (v == NULL) { 3402 *lengthPtr = 2; 3403 3404 if (ctxt == VAR_CMD || ctxt == VAR_GLOBAL) { 3405 /* 3406 * If substituting a local variable in a non-local context, 3407 * assume it's for dynamic source stuff. We have to handle 3408 * this specially and return the longhand for the variable 3409 * with the dollar sign escaped so it makes it back to the 3410 * caller. Only four of the local variables are treated 3411 * specially as they are the only four that will be set 3412 * when dynamic sources are expanded. 3413 */ 3414 switch (str[1]) { 3415 case '@': 3416 return "$(.TARGET)"; 3417 case '%': 3418 return "$(.MEMBER)"; 3419 case '*': 3420 return "$(.PREFIX)"; 3421 case '!': 3422 return "$(.ARCHIVE)"; 3423 } 3424 } 3425 return (eflags & VARE_UNDEFERR) ? var_Error : varNoError; 3426 } else { 3427 haveModifier = FALSE; 3428 tstr = str + 1; 3429 } 3430 } else { 3431 Buffer namebuf; /* Holds the variable name */ 3432 int depth; 3433 size_t namelen; 3434 char *varname; 3435 3436 endc = startc == PROPEN ? PRCLOSE : BRCLOSE; 3437 3438 Buf_Init(&namebuf, 0); 3439 3440 /* 3441 * Skip to the end character or a colon, whichever comes first. 3442 */ 3443 depth = 1; 3444 for (tstr = str + 2; *tstr != '\0'; tstr++) { 3445 /* Track depth so we can spot parse errors. */ 3446 if (*tstr == startc) 3447 depth++; 3448 if (*tstr == endc) { 3449 if (--depth == 0) 3450 break; 3451 } 3452 if (*tstr == ':' && depth == 1) 3453 break; 3454 /* A variable inside a variable, expand. */ 3455 if (*tstr == '$') { 3456 int rlen; 3457 void *freeIt; 3458 const char *rval = Var_Parse(tstr, ctxt, eflags, &rlen, 3459 &freeIt); 3460 if (rval != NULL) 3461 Buf_AddStr(&namebuf, rval); 3462 free(freeIt); 3463 tstr += rlen - 1; 3464 } else 3465 Buf_AddByte(&namebuf, *tstr); 3466 } 3467 if (*tstr == ':') { 3468 haveModifier = TRUE; 3469 } else if (*tstr == endc) { 3470 haveModifier = FALSE; 3471 } else { 3472 Parse_Error(PARSE_FATAL, "Unclosed variable \"%s\"", 3473 Buf_GetAll(&namebuf, NULL)); 3474 /* 3475 * If we never did find the end character, return NULL 3476 * right now, setting the length to be the distance to 3477 * the end of the string, since that's what make does. 3478 */ 3479 *lengthPtr = (int)(size_t)(tstr - str); 3480 Buf_Destroy(&namebuf, TRUE); 3481 return var_Error; 3482 } 3483 3484 varname = Buf_GetAll(&namebuf, &namelen); 3485 3486 /* 3487 * At this point, varname points into newly allocated memory from 3488 * namebuf, containing only the name of the variable. 3489 * 3490 * start and tstr point into the const string that was pointed 3491 * to by the original value of the str parameter. start points 3492 * to the '$' at the beginning of the string, while tstr points 3493 * to the char just after the end of the variable name -- this 3494 * will be '\0', ':', PRCLOSE, or BRCLOSE. 3495 */ 3496 3497 v = VarFind(varname, ctxt, FIND_ENV | FIND_GLOBAL | FIND_CMD); 3498 /* 3499 * Check also for bogus D and F forms of local variables since we're 3500 * in a local context and the name is the right length. 3501 */ 3502 if (v == NULL && ctxt != VAR_CMD && ctxt != VAR_GLOBAL && 3503 namelen == 2 && (varname[1] == 'F' || varname[1] == 'D') && 3504 strchr("@%?*!<>", varname[0]) != NULL) 3505 { 3506 /* 3507 * Well, it's local -- go look for it. 3508 */ 3509 char name[] = { varname[0], '\0' }; 3510 v = VarFind(name, ctxt, 0); 3511 3512 if (v != NULL) { 3513 if (varname[1] == 'D') { 3514 extramodifiers = "H:"; 3515 } else { /* F */ 3516 extramodifiers = "T:"; 3517 } 3518 } 3519 } 3520 3521 if (v == NULL) { 3522 dynamic = VarIsDynamic(ctxt, varname, namelen); 3523 3524 if (!haveModifier) { 3525 /* 3526 * No modifiers -- have specification length so we can return 3527 * now. 3528 */ 3529 *lengthPtr = (int)(size_t)(tstr - str) + 1; 3530 if (dynamic) { 3531 char *pstr = bmake_strldup(str, (size_t)*lengthPtr); 3532 *freePtr = pstr; 3533 Buf_Destroy(&namebuf, TRUE); 3534 return pstr; 3535 } else { 3536 Buf_Destroy(&namebuf, TRUE); 3537 return (eflags & VARE_UNDEFERR) ? var_Error : varNoError; 3538 } 3539 } else { 3540 /* 3541 * Still need to get to the end of the variable specification, 3542 * so kludge up a Var structure for the modifications 3543 */ 3544 v = bmake_malloc(sizeof(Var)); 3545 v->name = varname; 3546 Buf_Init(&v->val, 1); 3547 v->flags = VAR_JUNK; 3548 Buf_Destroy(&namebuf, FALSE); 3549 } 3550 } else 3551 Buf_Destroy(&namebuf, TRUE); 3552 } 3553 3554 if (v->flags & VAR_IN_USE) { 3555 Fatal("Variable %s is recursive.", v->name); 3556 /*NOTREACHED*/ 3557 } else { 3558 v->flags |= VAR_IN_USE; 3559 } 3560 3561 /* 3562 * Before doing any modification, we have to make sure the value 3563 * has been fully expanded. If it looks like recursion might be 3564 * necessary (there's a dollar sign somewhere in the variable's value) 3565 * we just call Var_Subst to do any other substitutions that are 3566 * necessary. Note that the value returned by Var_Subst will have 3567 * been dynamically-allocated, so it will need freeing when we 3568 * return. 3569 */ 3570 nstr = Buf_GetAll(&v->val, NULL); 3571 if (strchr(nstr, '$') != NULL && (eflags & VARE_WANTRES) != 0) { 3572 nstr = Var_Subst(nstr, ctxt, eflags); 3573 *freePtr = nstr; 3574 assert(nstr != NULL); 3575 } 3576 3577 v->flags &= ~(unsigned)VAR_IN_USE; 3578 3579 if (haveModifier || extramodifiers != NULL) { 3580 void *extraFree; 3581 3582 extraFree = NULL; 3583 if (extramodifiers != NULL) { 3584 const char *em = extramodifiers; 3585 nstr = ApplyModifiers(&em, nstr, '(', ')', 3586 v, ctxt, eflags, &extraFree); 3587 } 3588 3589 if (haveModifier) { 3590 /* Skip initial colon. */ 3591 tstr++; 3592 3593 nstr = ApplyModifiers(&tstr, nstr, startc, endc, 3594 v, ctxt, eflags, freePtr); 3595 free(extraFree); 3596 } else { 3597 *freePtr = extraFree; 3598 } 3599 } 3600 3601 /* Skip past endc if possible. */ 3602 *lengthPtr = (int)(size_t)(tstr + (*tstr ? 1 : 0) - str); 3603 3604 if (v->flags & VAR_FROM_ENV) { 3605 Boolean destroy = nstr != Buf_GetAll(&v->val, NULL); 3606 if (!destroy) { 3607 /* 3608 * Returning the value unmodified, so tell the caller to free 3609 * the thing. 3610 */ 3611 *freePtr = nstr; 3612 } 3613 (void)VarFreeEnv(v, destroy); 3614 } else if (v->flags & VAR_JUNK) { 3615 /* 3616 * Perform any freeing needed and set *freePtr to NULL so the caller 3617 * doesn't try to free a static pointer. 3618 * If VAR_KEEP is also set then we want to keep str(?) as is. 3619 */ 3620 if (!(v->flags & VAR_KEEP)) { 3621 if (*freePtr != NULL) { 3622 free(*freePtr); 3623 *freePtr = NULL; 3624 } 3625 if (dynamic) { 3626 nstr = bmake_strldup(str, (size_t)*lengthPtr); 3627 *freePtr = nstr; 3628 } else { 3629 nstr = (eflags & VARE_UNDEFERR) ? var_Error : varNoError; 3630 } 3631 } 3632 if (nstr != Buf_GetAll(&v->val, NULL)) 3633 Buf_Destroy(&v->val, TRUE); 3634 free(v->name); 3635 free(v); 3636 } 3637 return nstr; 3638 } 3639 3640 /*- 3641 *----------------------------------------------------------------------- 3642 * Var_Subst -- 3643 * Substitute for all variables in the given string in the given context. 3644 * If eflags & VARE_UNDEFERR, Parse_Error will be called when an undefined 3645 * variable is encountered. 3646 * 3647 * Input: 3648 * var Named variable || NULL for all 3649 * str the string which to substitute 3650 * ctxt the context wherein to find variables 3651 * eflags VARE_UNDEFERR if undefineds are an error 3652 * VARE_WANTRES if we actually want the result 3653 * VARE_ASSIGN if we are in a := assignment 3654 * 3655 * Results: 3656 * The resulting string. 3657 * 3658 * Side Effects: 3659 * Any effects from the modifiers, such as ::=, :sh or !cmd!, 3660 * if eflags contains VARE_WANTRES. 3661 *----------------------------------------------------------------------- 3662 */ 3663 char * 3664 Var_Subst(const char *str, GNode *ctxt, VarEvalFlags eflags) 3665 { 3666 Buffer buf; /* Buffer for forming things */ 3667 Boolean trailingBslash; 3668 3669 /* Set true if an error has already been reported, 3670 * to prevent a plethora of messages when recursing */ 3671 static Boolean errorReported; 3672 3673 Buf_Init(&buf, 0); 3674 errorReported = FALSE; 3675 trailingBslash = FALSE; /* variable ends in \ */ 3676 3677 while (*str) { 3678 if (*str == '\n' && trailingBslash) 3679 Buf_AddByte(&buf, ' '); 3680 3681 if (*str == '$' && str[1] == '$') { 3682 /* 3683 * A dollar sign may be escaped with another dollar sign. 3684 * In such a case, we skip over the escape character and store the 3685 * dollar sign into the buffer directly. 3686 */ 3687 if (save_dollars && (eflags & VARE_ASSIGN)) 3688 Buf_AddByte(&buf, '$'); 3689 Buf_AddByte(&buf, '$'); 3690 str += 2; 3691 } else if (*str != '$') { 3692 /* 3693 * Skip as many characters as possible -- either to the end of 3694 * the string or to the next dollar sign (variable invocation). 3695 */ 3696 const char *cp; 3697 3698 for (cp = str++; *str != '$' && *str != '\0'; str++) 3699 continue; 3700 Buf_AddBytesBetween(&buf, cp, str); 3701 } else { 3702 int length; 3703 void *freeIt; 3704 const char *val = Var_Parse(str, ctxt, eflags, &length, &freeIt); 3705 3706 if (val == var_Error || val == varNoError) { 3707 /* 3708 * If performing old-time variable substitution, skip over 3709 * the variable and continue with the substitution. Otherwise, 3710 * store the dollar sign and advance str so we continue with 3711 * the string... 3712 */ 3713 if (oldVars) { 3714 str += length; 3715 } else if ((eflags & VARE_UNDEFERR) || val == var_Error) { 3716 /* 3717 * If variable is undefined, complain and skip the 3718 * variable. The complaint will stop us from doing anything 3719 * when the file is parsed. 3720 */ 3721 if (!errorReported) { 3722 Parse_Error(PARSE_FATAL, "Undefined variable \"%.*s\"", 3723 length, str); 3724 } 3725 str += length; 3726 errorReported = TRUE; 3727 } else { 3728 Buf_AddByte(&buf, *str); 3729 str += 1; 3730 } 3731 } else { 3732 size_t val_len; 3733 3734 str += length; 3735 3736 val_len = strlen(val); 3737 Buf_AddBytes(&buf, val, val_len); 3738 trailingBslash = val_len > 0 && val[val_len - 1] == '\\'; 3739 } 3740 free(freeIt); 3741 freeIt = NULL; 3742 } 3743 } 3744 3745 return Buf_DestroyCompact(&buf); 3746 } 3747 3748 /* Initialize the module. */ 3749 void 3750 Var_Init(void) 3751 { 3752 VAR_INTERNAL = Targ_NewGN("Internal"); 3753 VAR_GLOBAL = Targ_NewGN("Global"); 3754 VAR_CMD = Targ_NewGN("Command"); 3755 } 3756 3757 3758 void 3759 Var_End(void) 3760 { 3761 Var_Stats(); 3762 } 3763 3764 void 3765 Var_Stats(void) 3766 { 3767 Hash_DebugStats(&VAR_GLOBAL->context, "VAR_GLOBAL"); 3768 } 3769 3770 3771 /****************** PRINT DEBUGGING INFO *****************/ 3772 static void 3773 VarPrintVar(void *vp, void *data MAKE_ATTR_UNUSED) 3774 { 3775 Var *v = (Var *)vp; 3776 fprintf(debug_file, "%-16s = %s\n", v->name, Buf_GetAll(&v->val, NULL)); 3777 } 3778 3779 /* Print all variables in a context, unordered. */ 3780 void 3781 Var_Dump(GNode *ctxt) 3782 { 3783 Hash_ForEach(&ctxt->context, VarPrintVar, NULL); 3784 } 3785
Indexes created Mon Sep 22 13:09:51 GMT 2025