xref: /freebsd/contrib/bmake/parse.c (revision 1e248b8346cbf585990a4da0199c6cc3b9cc2340)
1 /*	$NetBSD: parse.c,v 1.212 2016/02/19 06:19:06 sjg Exp $	*/
2 
3 /*
4  * Copyright (c) 1988, 1989, 1990, 1993
5  *	The Regents of the University of California.  All rights reserved.
6  *
7  * This code is derived from software contributed to Berkeley by
8  * Adam de Boor.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  * 3. Neither the name of the University nor the names of its contributors
19  *    may be used to endorse or promote products derived from this software
20  *    without specific prior written permission.
21  *
22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32  * SUCH DAMAGE.
33  */
34 
35 /*
36  * Copyright (c) 1989 by Berkeley Softworks
37  * All rights reserved.
38  *
39  * This code is derived from software contributed to Berkeley by
40  * Adam de Boor.
41  *
42  * Redistribution and use in source and binary forms, with or without
43  * modification, are permitted provided that the following conditions
44  * are met:
45  * 1. Redistributions of source code must retain the above copyright
46  *    notice, this list of conditions and the following disclaimer.
47  * 2. Redistributions in binary form must reproduce the above copyright
48  *    notice, this list of conditions and the following disclaimer in the
49  *    documentation and/or other materials provided with the distribution.
50  * 3. All advertising materials mentioning features or use of this software
51  *    must display the following acknowledgement:
52  *	This product includes software developed by the University of
53  *	California, Berkeley and its contributors.
54  * 4. Neither the name of the University nor the names of its contributors
55  *    may be used to endorse or promote products derived from this software
56  *    without specific prior written permission.
57  *
58  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
59  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
60  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
61  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
62  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
63  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
64  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
65  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
66  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
67  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
68  * SUCH DAMAGE.
69  */
70 
71 #ifndef MAKE_NATIVE
72 static char rcsid[] = "$NetBSD: parse.c,v 1.212 2016/02/19 06:19:06 sjg Exp $";
73 #else
74 #include <sys/cdefs.h>
75 #ifndef lint
76 #if 0
77 static char sccsid[] = "@(#)parse.c	8.3 (Berkeley) 3/19/94";
78 #else
79 __RCSID("$NetBSD: parse.c,v 1.212 2016/02/19 06:19:06 sjg Exp $");
80 #endif
81 #endif /* not lint */
82 #endif
83 
84 /*-
85  * parse.c --
86  *	Functions to parse a makefile.
87  *
88  *	One function, Parse_Init, must be called before any functions
89  *	in this module are used. After that, the function Parse_File is the
90  *	main entry point and controls most of the other functions in this
91  *	module.
92  *
93  *	Most important structures are kept in Lsts. Directories for
94  *	the .include "..." function are kept in the 'parseIncPath' Lst, while
95  *	those for the .include <...> are kept in the 'sysIncPath' Lst. The
96  *	targets currently being defined are kept in the 'targets' Lst.
97  *
98  *	The variables 'fname' and 'lineno' are used to track the name
99  *	of the current file and the line number in that file so that error
100  *	messages can be more meaningful.
101  *
102  * Interface:
103  *	Parse_Init	    	    Initialization function which must be
104  *	    	  	    	    called before anything else in this module
105  *	    	  	    	    is used.
106  *
107  *	Parse_End		    Cleanup the module
108  *
109  *	Parse_File	    	    Function used to parse a makefile. It must
110  *	    	  	    	    be given the name of the file, which should
111  *	    	  	    	    already have been opened, and a function
112  *	    	  	    	    to call to read a character from the file.
113  *
114  *	Parse_IsVar	    	    Returns TRUE if the given line is a
115  *	    	  	    	    variable assignment. Used by MainParseArgs
116  *	    	  	    	    to determine if an argument is a target
117  *	    	  	    	    or a variable assignment. Used internally
118  *	    	  	    	    for pretty much the same thing...
119  *
120  *	Parse_Error	    	    Function called when an error occurs in
121  *	    	  	    	    parsing. Used by the variable and
122  *	    	  	    	    conditional modules.
123  *	Parse_MainName	    	    Returns a Lst of the main target to create.
124  */
125 
126 #include <sys/types.h>
127 #include <sys/stat.h>
128 #include <assert.h>
129 #include <ctype.h>
130 #include <errno.h>
131 #include <stdarg.h>
132 #include <stdio.h>
133 
134 #include "make.h"
135 #include "hash.h"
136 #include "dir.h"
137 #include "job.h"
138 #include "buf.h"
139 #include "pathnames.h"
140 
141 #ifdef HAVE_MMAP
142 #include <sys/mman.h>
143 
144 #ifndef MAP_COPY
145 #define MAP_COPY MAP_PRIVATE
146 #endif
147 #ifndef MAP_FILE
148 #define MAP_FILE 0
149 #endif
150 #endif
151 
152 ////////////////////////////////////////////////////////////
153 // types and constants
154 
155 /*
156  * Structure for a file being read ("included file")
157  */
158 typedef struct IFile {
159     char      	    *fname;         /* name of file */
160     int             lineno;         /* current line number in file */
161     int             first_lineno;   /* line number of start of text */
162     int             cond_depth;     /* 'if' nesting when file opened */
163     Boolean         depending;      /* state of doing_depend on EOF */
164     char            *P_str;         /* point to base of string buffer */
165     char            *P_ptr;         /* point to next char of string buffer */
166     char            *P_end;         /* point to the end of string buffer */
167     char            *(*nextbuf)(void *, size_t *); /* Function to get more data */
168     void            *nextbuf_arg;   /* Opaque arg for nextbuf() */
169     struct loadedfile *lf;          /* loadedfile object, if any */
170 } IFile;
171 
172 
173 /*
174  * These values are returned by ParseEOF to tell Parse_File whether to
175  * CONTINUE parsing, i.e. it had only reached the end of an include file,
176  * or if it's DONE.
177  */
178 #define CONTINUE	1
179 #define DONE		0
180 
181 /*
182  * Tokens for target attributes
183  */
184 typedef enum {
185     Begin,  	    /* .BEGIN */
186     Default,	    /* .DEFAULT */
187     End,    	    /* .END */
188     dotError,	    /* .ERROR */
189     Ignore,	    /* .IGNORE */
190     Includes,	    /* .INCLUDES */
191     Interrupt,	    /* .INTERRUPT */
192     Libs,	    /* .LIBS */
193     Meta,	    /* .META */
194     MFlags,	    /* .MFLAGS or .MAKEFLAGS */
195     Main,	    /* .MAIN and we don't have anything user-specified to
196 		     * make */
197     NoExport,	    /* .NOEXPORT */
198     NoMeta,	    /* .NOMETA */
199     NoMetaCmp,	    /* .NOMETA_CMP */
200     NoPath,	    /* .NOPATH */
201     Not,	    /* Not special */
202     NotParallel,    /* .NOTPARALLEL */
203     Null,   	    /* .NULL */
204     ExObjdir,	    /* .OBJDIR */
205     Order,  	    /* .ORDER */
206     Parallel,	    /* .PARALLEL */
207     ExPath,	    /* .PATH */
208     Phony,	    /* .PHONY */
209 #ifdef POSIX
210     Posix,	    /* .POSIX */
211 #endif
212     Precious,	    /* .PRECIOUS */
213     ExShell,	    /* .SHELL */
214     Silent,	    /* .SILENT */
215     SingleShell,    /* .SINGLESHELL */
216     Stale,	    /* .STALE */
217     Suffixes,	    /* .SUFFIXES */
218     Wait,	    /* .WAIT */
219     Attribute	    /* Generic attribute */
220 } ParseSpecial;
221 
222 /*
223  * Other tokens
224  */
225 #define LPAREN	'('
226 #define RPAREN	')'
227 
228 
229 ////////////////////////////////////////////////////////////
230 // result data
231 
232 /*
233  * The main target to create. This is the first target on the first
234  * dependency line in the first makefile.
235  */
236 static GNode *mainNode;
237 
238 ////////////////////////////////////////////////////////////
239 // eval state
240 
241 /* targets we're working on */
242 static Lst targets;
243 
244 #ifdef CLEANUP
245 /* command lines for targets */
246 static Lst targCmds;
247 #endif
248 
249 /*
250  * specType contains the SPECial TYPE of the current target. It is
251  * Not if the target is unspecial. If it *is* special, however, the children
252  * are linked as children of the parent but not vice versa. This variable is
253  * set in ParseDoDependency
254  */
255 static ParseSpecial specType;
256 
257 /*
258  * Predecessor node for handling .ORDER. Initialized to NULL when .ORDER
259  * seen, then set to each successive source on the line.
260  */
261 static GNode	*predecessor;
262 
263 ////////////////////////////////////////////////////////////
264 // parser state
265 
266 /* true if currently in a dependency line or its commands */
267 static Boolean inLine;
268 
269 /* number of fatal errors */
270 static int fatals = 0;
271 
272 /*
273  * Variables for doing includes
274  */
275 
276 /* current file being read */
277 static IFile *curFile;
278 
279 /* stack of IFiles generated by .includes */
280 static Lst includes;
281 
282 /* include paths (lists of directories) */
283 Lst parseIncPath;	/* dirs for "..." includes */
284 Lst sysIncPath;		/* dirs for <...> includes */
285 Lst defIncPath;		/* default for sysIncPath */
286 
287 ////////////////////////////////////////////////////////////
288 // parser tables
289 
290 /*
291  * The parseKeywords table is searched using binary search when deciding
292  * if a target or source is special. The 'spec' field is the ParseSpecial
293  * type of the keyword ("Not" if the keyword isn't special as a target) while
294  * the 'op' field is the operator to apply to the list of targets if the
295  * keyword is used as a source ("0" if the keyword isn't special as a source)
296  */
297 static const struct {
298     const char   *name;    	/* Name of keyword */
299     ParseSpecial  spec;	    	/* Type when used as a target */
300     int	    	  op;	    	/* Operator when used as a source */
301 } parseKeywords[] = {
302 { ".BEGIN", 	  Begin,    	0 },
303 { ".DEFAULT",	  Default,  	0 },
304 { ".END",   	  End,	    	0 },
305 { ".ERROR",   	  dotError,    	0 },
306 { ".EXEC",	  Attribute,   	OP_EXEC },
307 { ".IGNORE",	  Ignore,   	OP_IGNORE },
308 { ".INCLUDES",	  Includes, 	0 },
309 { ".INTERRUPT",	  Interrupt,	0 },
310 { ".INVISIBLE",	  Attribute,   	OP_INVISIBLE },
311 { ".JOIN",  	  Attribute,   	OP_JOIN },
312 { ".LIBS",  	  Libs,	    	0 },
313 { ".MADE",	  Attribute,	OP_MADE },
314 { ".MAIN",	  Main,		0 },
315 { ".MAKE",  	  Attribute,   	OP_MAKE },
316 { ".MAKEFLAGS",	  MFlags,   	0 },
317 { ".META",	  Meta,		OP_META },
318 { ".MFLAGS",	  MFlags,   	0 },
319 { ".NOMETA",	  NoMeta,	OP_NOMETA },
320 { ".NOMETA_CMP",  NoMetaCmp,	OP_NOMETA_CMP },
321 { ".NOPATH",	  NoPath,	OP_NOPATH },
322 { ".NOTMAIN",	  Attribute,   	OP_NOTMAIN },
323 { ".NOTPARALLEL", NotParallel,	0 },
324 { ".NO_PARALLEL", NotParallel,	0 },
325 { ".NULL",  	  Null,	    	0 },
326 { ".OBJDIR",	  ExObjdir,	0 },
327 { ".OPTIONAL",	  Attribute,   	OP_OPTIONAL },
328 { ".ORDER", 	  Order,    	0 },
329 { ".PARALLEL",	  Parallel,	0 },
330 { ".PATH",	  ExPath,	0 },
331 { ".PHONY",	  Phony,	OP_PHONY },
332 #ifdef POSIX
333 { ".POSIX",	  Posix,	0 },
334 #endif
335 { ".PRECIOUS",	  Precious, 	OP_PRECIOUS },
336 { ".RECURSIVE",	  Attribute,	OP_MAKE },
337 { ".SHELL", 	  ExShell,    	0 },
338 { ".SILENT",	  Silent,   	OP_SILENT },
339 { ".SINGLESHELL", SingleShell,	0 },
340 { ".STALE",	  Stale,	0 },
341 { ".SUFFIXES",	  Suffixes, 	0 },
342 { ".USE",   	  Attribute,   	OP_USE },
343 { ".USEBEFORE",   Attribute,   	OP_USEBEFORE },
344 { ".WAIT",	  Wait, 	0 },
345 };
346 
347 ////////////////////////////////////////////////////////////
348 // local functions
349 
350 static int ParseIsEscaped(const char *, const char *);
351 static void ParseErrorInternal(const char *, size_t, int, const char *, ...)
352     MAKE_ATTR_PRINTFLIKE(4,5);
353 static void ParseVErrorInternal(FILE *, const char *, size_t, int, const char *, va_list)
354     MAKE_ATTR_PRINTFLIKE(5, 0);
355 static int ParseFindKeyword(const char *);
356 static int ParseLinkSrc(void *, void *);
357 static int ParseDoOp(void *, void *);
358 static void ParseDoSrc(int, const char *);
359 static int ParseFindMain(void *, void *);
360 static int ParseAddDir(void *, void *);
361 static int ParseClearPath(void *, void *);
362 static void ParseDoDependency(char *);
363 static int ParseAddCmd(void *, void *);
364 static void ParseHasCommands(void *);
365 static void ParseDoInclude(char *);
366 static void ParseSetParseFile(const char *);
367 static void ParseSetIncludedFile(void);
368 #ifdef SYSVINCLUDE
369 static void ParseTraditionalInclude(char *);
370 #endif
371 #ifdef GMAKEEXPORT
372 static void ParseGmakeExport(char *);
373 #endif
374 static int ParseEOF(void);
375 static char *ParseReadLine(void);
376 static void ParseFinishLine(void);
377 static void ParseMark(GNode *);
378 
379 ////////////////////////////////////////////////////////////
380 // file loader
381 
382 struct loadedfile {
383 	const char *path;		/* name, for error reports */
384 	char *buf;			/* contents buffer */
385 	size_t len;			/* length of contents */
386 	size_t maplen;			/* length of mmap area, or 0 */
387 	Boolean used;			/* XXX: have we used the data yet */
388 };
389 
390 /*
391  * Constructor/destructor for loadedfile
392  */
393 static struct loadedfile *
394 loadedfile_create(const char *path)
395 {
396 	struct loadedfile *lf;
397 
398 	lf = bmake_malloc(sizeof(*lf));
399 	lf->path = (path == NULL ? "(stdin)" : path);
400 	lf->buf = NULL;
401 	lf->len = 0;
402 	lf->maplen = 0;
403 	lf->used = FALSE;
404 	return lf;
405 }
406 
407 static void
408 loadedfile_destroy(struct loadedfile *lf)
409 {
410 	if (lf->buf != NULL) {
411 		if (lf->maplen > 0) {
412 #ifdef HAVE_MMAP
413 			munmap(lf->buf, lf->maplen);
414 #endif
415 		} else {
416 			free(lf->buf);
417 		}
418 	}
419 	free(lf);
420 }
421 
422 /*
423  * nextbuf() operation for loadedfile, as needed by the weird and twisted
424  * logic below. Once that's cleaned up, we can get rid of lf->used...
425  */
426 static char *
427 loadedfile_nextbuf(void *x, size_t *len)
428 {
429 	struct loadedfile *lf = x;
430 
431 	if (lf->used) {
432 		return NULL;
433 	}
434 	lf->used = TRUE;
435 	*len = lf->len;
436 	return lf->buf;
437 }
438 
439 /*
440  * Try to get the size of a file.
441  */
442 static ReturnStatus
443 load_getsize(int fd, size_t *ret)
444 {
445 	struct stat st;
446 
447 	if (fstat(fd, &st) < 0) {
448 		return FAILURE;
449 	}
450 
451 	if (!S_ISREG(st.st_mode)) {
452 		return FAILURE;
453 	}
454 
455 	/*
456 	 * st_size is an off_t, which is 64 bits signed; *ret is
457 	 * size_t, which might be 32 bits unsigned or 64 bits
458 	 * unsigned. Rather than being elaborate, just punt on
459 	 * files that are more than 2^31 bytes. We should never
460 	 * see a makefile that size in practice...
461 	 *
462 	 * While we're at it reject negative sizes too, just in case.
463 	 */
464 	if (st.st_size < 0 || st.st_size > 0x7fffffff) {
465 		return FAILURE;
466 	}
467 
468 	*ret = (size_t) st.st_size;
469 	return SUCCESS;
470 }
471 
472 /*
473  * Read in a file.
474  *
475  * Until the path search logic can be moved under here instead of
476  * being in the caller in another source file, we need to have the fd
477  * passed in already open. Bleh.
478  *
479  * If the path is NULL use stdin and (to insure against fd leaks)
480  * assert that the caller passed in -1.
481  */
482 static struct loadedfile *
483 loadfile(const char *path, int fd)
484 {
485 	struct loadedfile *lf;
486 #ifdef HAVE_MMAP
487 	long pagesize;
488 #endif
489 	ssize_t result;
490 	size_t bufpos;
491 
492 	lf = loadedfile_create(path);
493 
494 	if (path == NULL) {
495 		assert(fd == -1);
496 		fd = STDIN_FILENO;
497 	} else {
498 #if 0 /* notyet */
499 		fd = open(path, O_RDONLY);
500 		if (fd < 0) {
501 			...
502 			Error("%s: %s", path, strerror(errno));
503 			exit(1);
504 		}
505 #endif
506 	}
507 
508 #ifdef HAVE_MMAP
509 	if (load_getsize(fd, &lf->len) == SUCCESS) {
510 		/* found a size, try mmap */
511 #ifdef _SC_PAGESIZE
512 		pagesize = sysconf(_SC_PAGESIZE);
513 #else
514 		pagesize = 0;
515 #endif
516 		if (pagesize <= 0) {
517 			pagesize = 0x1000;
518 		}
519 		/* round size up to a page */
520 		lf->maplen = pagesize * ((lf->len + pagesize - 1)/pagesize);
521 
522 		/*
523 		 * XXX hack for dealing with empty files; remove when
524 		 * we're no longer limited by interfacing to the old
525 		 * logic elsewhere in this file.
526 		 */
527 		if (lf->maplen == 0) {
528 			lf->maplen = pagesize;
529 		}
530 
531 		/*
532 		 * FUTURE: remove PROT_WRITE when the parser no longer
533 		 * needs to scribble on the input.
534 		 */
535 		lf->buf = mmap(NULL, lf->maplen, PROT_READ|PROT_WRITE,
536 			       MAP_FILE|MAP_COPY, fd, 0);
537 		if (lf->buf != MAP_FAILED) {
538 			/* succeeded */
539 			if (lf->len == lf->maplen && lf->buf[lf->len - 1] != '\n') {
540 				char *b = malloc(lf->len + 1);
541 				b[lf->len] = '\n';
542 				memcpy(b, lf->buf, lf->len++);
543 				munmap(lf->buf, lf->maplen);
544 				lf->maplen = 0;
545 				lf->buf = b;
546 			}
547 			goto done;
548 		}
549 	}
550 #endif
551 	/* cannot mmap; load the traditional way */
552 
553 	lf->maplen = 0;
554 	lf->len = 1024;
555 	lf->buf = bmake_malloc(lf->len);
556 
557 	bufpos = 0;
558 	while (1) {
559 		assert(bufpos <= lf->len);
560 		if (bufpos == lf->len) {
561 			lf->len *= 2;
562 			lf->buf = bmake_realloc(lf->buf, lf->len);
563 		}
564 		result = read(fd, lf->buf + bufpos, lf->len - bufpos);
565 		if (result < 0) {
566 			Error("%s: read error: %s", path, strerror(errno));
567 			exit(1);
568 		}
569 		if (result == 0) {
570 			break;
571 		}
572 		bufpos += result;
573 	}
574 	assert(bufpos <= lf->len);
575 	lf->len = bufpos;
576 
577 	/* truncate malloc region to actual length (maybe not useful) */
578 	if (lf->len > 0) {
579 		lf->buf = bmake_realloc(lf->buf, lf->len);
580 	}
581 
582 #ifdef HAVE_MMAP
583 done:
584 #endif
585 	if (path != NULL) {
586 		close(fd);
587 	}
588 	return lf;
589 }
590 
591 ////////////////////////////////////////////////////////////
592 // old code
593 
594 /*-
595  *----------------------------------------------------------------------
596  * ParseIsEscaped --
597  *	Check if the current character is escaped on the current line
598  *
599  * Results:
600  *	0 if the character is not backslash escaped, 1 otherwise
601  *
602  * Side Effects:
603  *	None
604  *----------------------------------------------------------------------
605  */
606 static int
607 ParseIsEscaped(const char *line, const char *c)
608 {
609     int active = 0;
610     for (;;) {
611 	if (line == c)
612 	    return active;
613 	if (*--c != '\\')
614 	    return active;
615 	active = !active;
616     }
617 }
618 
619 /*-
620  *----------------------------------------------------------------------
621  * ParseFindKeyword --
622  *	Look in the table of keywords for one matching the given string.
623  *
624  * Input:
625  *	str		String to find
626  *
627  * Results:
628  *	The index of the keyword, or -1 if it isn't there.
629  *
630  * Side Effects:
631  *	None
632  *----------------------------------------------------------------------
633  */
634 static int
635 ParseFindKeyword(const char *str)
636 {
637     int    start, end, cur;
638     int    diff;
639 
640     start = 0;
641     end = (sizeof(parseKeywords)/sizeof(parseKeywords[0])) - 1;
642 
643     do {
644 	cur = start + ((end - start) / 2);
645 	diff = strcmp(str, parseKeywords[cur].name);
646 
647 	if (diff == 0) {
648 	    return (cur);
649 	} else if (diff < 0) {
650 	    end = cur - 1;
651 	} else {
652 	    start = cur + 1;
653 	}
654     } while (start <= end);
655     return (-1);
656 }
657 
658 /*-
659  * ParseVErrorInternal  --
660  *	Error message abort function for parsing. Prints out the context
661  *	of the error (line number and file) as well as the message with
662  *	two optional arguments.
663  *
664  * Results:
665  *	None
666  *
667  * Side Effects:
668  *	"fatals" is incremented if the level is PARSE_FATAL.
669  */
670 /* VARARGS */
671 static void
672 ParseVErrorInternal(FILE *f, const char *cfname, size_t clineno, int type,
673     const char *fmt, va_list ap)
674 {
675 	static Boolean fatal_warning_error_printed = FALSE;
676 
677 	(void)fprintf(f, "%s: ", progname);
678 
679 	if (cfname != NULL) {
680 		(void)fprintf(f, "\"");
681 		if (*cfname != '/' && strcmp(cfname, "(stdin)") != 0) {
682 			char *cp;
683 			const char *dir;
684 
685 			/*
686 			 * Nothing is more annoying than not knowing
687 			 * which Makefile is the culprit.
688 			 */
689 			dir = Var_Value(".PARSEDIR", VAR_GLOBAL, &cp);
690 			if (dir == NULL || *dir == '\0' ||
691 			    (*dir == '.' && dir[1] == '\0'))
692 				dir = Var_Value(".CURDIR", VAR_GLOBAL, &cp);
693 			if (dir == NULL)
694 				dir = ".";
695 
696 			(void)fprintf(f, "%s/%s", dir, cfname);
697 		} else
698 			(void)fprintf(f, "%s", cfname);
699 
700 		(void)fprintf(f, "\" line %d: ", (int)clineno);
701 	}
702 	if (type == PARSE_WARNING)
703 		(void)fprintf(f, "warning: ");
704 	(void)vfprintf(f, fmt, ap);
705 	(void)fprintf(f, "\n");
706 	(void)fflush(f);
707 	if (type == PARSE_FATAL || parseWarnFatal)
708 		fatals += 1;
709 	if (parseWarnFatal && !fatal_warning_error_printed) {
710 		Error("parsing warnings being treated as errors");
711 		fatal_warning_error_printed = TRUE;
712 	}
713 }
714 
715 /*-
716  * ParseErrorInternal  --
717  *	Error function
718  *
719  * Results:
720  *	None
721  *
722  * Side Effects:
723  *	None
724  */
725 /* VARARGS */
726 static void
727 ParseErrorInternal(const char *cfname, size_t clineno, int type,
728     const char *fmt, ...)
729 {
730 	va_list ap;
731 
732 	va_start(ap, fmt);
733 	(void)fflush(stdout);
734 	ParseVErrorInternal(stderr, cfname, clineno, type, fmt, ap);
735 	va_end(ap);
736 
737 	if (debug_file != stderr && debug_file != stdout) {
738 		va_start(ap, fmt);
739 		ParseVErrorInternal(debug_file, cfname, clineno, type, fmt, ap);
740 		va_end(ap);
741 	}
742 }
743 
744 /*-
745  * Parse_Error  --
746  *	External interface to ParseErrorInternal; uses the default filename
747  *	Line number.
748  *
749  * Results:
750  *	None
751  *
752  * Side Effects:
753  *	None
754  */
755 /* VARARGS */
756 void
757 Parse_Error(int type, const char *fmt, ...)
758 {
759 	va_list ap;
760 	const char *fname;
761 	size_t lineno;
762 
763 	if (curFile == NULL) {
764 		fname = NULL;
765 		lineno = 0;
766 	} else {
767 		fname = curFile->fname;
768 		lineno = curFile->lineno;
769 	}
770 
771 	va_start(ap, fmt);
772 	(void)fflush(stdout);
773 	ParseVErrorInternal(stderr, fname, lineno, type, fmt, ap);
774 	va_end(ap);
775 
776 	if (debug_file != stderr && debug_file != stdout) {
777 		va_start(ap, fmt);
778 		ParseVErrorInternal(debug_file, fname, lineno, type, fmt, ap);
779 		va_end(ap);
780 	}
781 }
782 
783 
784 /*
785  * ParseMessage
786  *	Parse a .info .warning or .error directive
787  *
788  *	The input is the line minus the ".".  We substitute
789  *	variables, print the message and exit(1) (for .error) or just print
790  *	a warning if the directive is malformed.
791  */
792 static Boolean
793 ParseMessage(char *line)
794 {
795     int mtype;
796 
797     switch(*line) {
798     case 'i':
799 	mtype = 0;
800 	break;
801     case 'w':
802 	mtype = PARSE_WARNING;
803 	break;
804     case 'e':
805 	mtype = PARSE_FATAL;
806 	break;
807     default:
808 	Parse_Error(PARSE_WARNING, "invalid syntax: \".%s\"", line);
809 	return FALSE;
810     }
811 
812     while (isalpha((u_char)*line))
813 	line++;
814     if (!isspace((u_char)*line))
815 	return FALSE;			/* not for us */
816     while (isspace((u_char)*line))
817 	line++;
818 
819     line = Var_Subst(NULL, line, VAR_CMD, VARF_WANTRES);
820     Parse_Error(mtype, "%s", line);
821     free(line);
822 
823     if (mtype == PARSE_FATAL) {
824 	/* Terminate immediately. */
825 	exit(1);
826     }
827     return TRUE;
828 }
829 
830 /*-
831  *---------------------------------------------------------------------
832  * ParseLinkSrc  --
833  *	Link the parent node to its new child. Used in a Lst_ForEach by
834  *	ParseDoDependency. If the specType isn't 'Not', the parent
835  *	isn't linked as a parent of the child.
836  *
837  * Input:
838  *	pgnp		The parent node
839  *	cgpn		The child node
840  *
841  * Results:
842  *	Always = 0
843  *
844  * Side Effects:
845  *	New elements are added to the parents list of cgn and the
846  *	children list of cgn. the unmade field of pgn is updated
847  *	to reflect the additional child.
848  *---------------------------------------------------------------------
849  */
850 static int
851 ParseLinkSrc(void *pgnp, void *cgnp)
852 {
853     GNode          *pgn = (GNode *)pgnp;
854     GNode          *cgn = (GNode *)cgnp;
855 
856     if ((pgn->type & OP_DOUBLEDEP) && !Lst_IsEmpty (pgn->cohorts))
857 	pgn = (GNode *)Lst_Datum(Lst_Last(pgn->cohorts));
858     (void)Lst_AtEnd(pgn->children, cgn);
859     if (specType == Not)
860 	    (void)Lst_AtEnd(cgn->parents, pgn);
861     pgn->unmade += 1;
862     if (DEBUG(PARSE)) {
863 	fprintf(debug_file, "# %s: added child %s - %s\n", __func__,
864 	    pgn->name, cgn->name);
865 	Targ_PrintNode(pgn, 0);
866 	Targ_PrintNode(cgn, 0);
867     }
868     return (0);
869 }
870 
871 /*-
872  *---------------------------------------------------------------------
873  * ParseDoOp  --
874  *	Apply the parsed operator to the given target node. Used in a
875  *	Lst_ForEach call by ParseDoDependency once all targets have
876  *	been found and their operator parsed. If the previous and new
877  *	operators are incompatible, a major error is taken.
878  *
879  * Input:
880  *	gnp		The node to which the operator is to be applied
881  *	opp		The operator to apply
882  *
883  * Results:
884  *	Always 0
885  *
886  * Side Effects:
887  *	The type field of the node is altered to reflect any new bits in
888  *	the op.
889  *---------------------------------------------------------------------
890  */
891 static int
892 ParseDoOp(void *gnp, void *opp)
893 {
894     GNode          *gn = (GNode *)gnp;
895     int             op = *(int *)opp;
896     /*
897      * If the dependency mask of the operator and the node don't match and
898      * the node has actually had an operator applied to it before, and
899      * the operator actually has some dependency information in it, complain.
900      */
901     if (((op & OP_OPMASK) != (gn->type & OP_OPMASK)) &&
902 	!OP_NOP(gn->type) && !OP_NOP(op))
903     {
904 	Parse_Error(PARSE_FATAL, "Inconsistent operator for %s", gn->name);
905 	return (1);
906     }
907 
908     if ((op == OP_DOUBLEDEP) && ((gn->type & OP_OPMASK) == OP_DOUBLEDEP)) {
909 	/*
910 	 * If the node was the object of a :: operator, we need to create a
911 	 * new instance of it for the children and commands on this dependency
912 	 * line. The new instance is placed on the 'cohorts' list of the
913 	 * initial one (note the initial one is not on its own cohorts list)
914 	 * and the new instance is linked to all parents of the initial
915 	 * instance.
916 	 */
917 	GNode	*cohort;
918 
919 	/*
920 	 * Propagate copied bits to the initial node.  They'll be propagated
921 	 * back to the rest of the cohorts later.
922 	 */
923 	gn->type |= op & ~OP_OPMASK;
924 
925 	cohort = Targ_FindNode(gn->name, TARG_NOHASH);
926 	if (doing_depend)
927 	    ParseMark(cohort);
928 	/*
929 	 * Make the cohort invisible as well to avoid duplicating it into
930 	 * other variables. True, parents of this target won't tend to do
931 	 * anything with their local variables, but better safe than
932 	 * sorry. (I think this is pointless now, since the relevant list
933 	 * traversals will no longer see this node anyway. -mycroft)
934 	 */
935 	cohort->type = op | OP_INVISIBLE;
936 	(void)Lst_AtEnd(gn->cohorts, cohort);
937 	cohort->centurion = gn;
938 	gn->unmade_cohorts += 1;
939 	snprintf(cohort->cohort_num, sizeof cohort->cohort_num, "#%d",
940 		gn->unmade_cohorts);
941     } else {
942 	/*
943 	 * We don't want to nuke any previous flags (whatever they were) so we
944 	 * just OR the new operator into the old
945 	 */
946 	gn->type |= op;
947     }
948 
949     return (0);
950 }
951 
952 /*-
953  *---------------------------------------------------------------------
954  * ParseDoSrc  --
955  *	Given the name of a source, figure out if it is an attribute
956  *	and apply it to the targets if it is. Else decide if there is
957  *	some attribute which should be applied *to* the source because
958  *	of some special target and apply it if so. Otherwise, make the
959  *	source be a child of the targets in the list 'targets'
960  *
961  * Input:
962  *	tOp		operator (if any) from special targets
963  *	src		name of the source to handle
964  *
965  * Results:
966  *	None
967  *
968  * Side Effects:
969  *	Operator bits may be added to the list of targets or to the source.
970  *	The targets may have a new source added to their lists of children.
971  *---------------------------------------------------------------------
972  */
973 static void
974 ParseDoSrc(int tOp, const char *src)
975 {
976     GNode	*gn = NULL;
977     static int wait_number = 0;
978     char wait_src[16];
979 
980     if (*src == '.' && isupper ((unsigned char)src[1])) {
981 	int keywd = ParseFindKeyword(src);
982 	if (keywd != -1) {
983 	    int op = parseKeywords[keywd].op;
984 	    if (op != 0) {
985 		Lst_ForEach(targets, ParseDoOp, &op);
986 		return;
987 	    }
988 	    if (parseKeywords[keywd].spec == Wait) {
989 		/*
990 		 * We add a .WAIT node in the dependency list.
991 		 * After any dynamic dependencies (and filename globbing)
992 		 * have happened, it is given a dependency on the each
993 		 * previous child back to and previous .WAIT node.
994 		 * The next child won't be scheduled until the .WAIT node
995 		 * is built.
996 		 * We give each .WAIT node a unique name (mainly for diag).
997 		 */
998 		snprintf(wait_src, sizeof wait_src, ".WAIT_%u", ++wait_number);
999 		gn = Targ_FindNode(wait_src, TARG_NOHASH);
1000 		if (doing_depend)
1001 		    ParseMark(gn);
1002 		gn->type = OP_WAIT | OP_PHONY | OP_DEPENDS | OP_NOTMAIN;
1003 		Lst_ForEach(targets, ParseLinkSrc, gn);
1004 		return;
1005 	    }
1006 	}
1007     }
1008 
1009     switch (specType) {
1010     case Main:
1011 	/*
1012 	 * If we have noted the existence of a .MAIN, it means we need
1013 	 * to add the sources of said target to the list of things
1014 	 * to create. The string 'src' is likely to be free, so we
1015 	 * must make a new copy of it. Note that this will only be
1016 	 * invoked if the user didn't specify a target on the command
1017 	 * line. This is to allow #ifmake's to succeed, or something...
1018 	 */
1019 	(void)Lst_AtEnd(create, bmake_strdup(src));
1020 	/*
1021 	 * Add the name to the .TARGETS variable as well, so the user can
1022 	 * employ that, if desired.
1023 	 */
1024 	Var_Append(".TARGETS", src, VAR_GLOBAL);
1025 	return;
1026 
1027     case Order:
1028 	/*
1029 	 * Create proper predecessor/successor links between the previous
1030 	 * source and the current one.
1031 	 */
1032 	gn = Targ_FindNode(src, TARG_CREATE);
1033 	if (doing_depend)
1034 	    ParseMark(gn);
1035 	if (predecessor != NULL) {
1036 	    (void)Lst_AtEnd(predecessor->order_succ, gn);
1037 	    (void)Lst_AtEnd(gn->order_pred, predecessor);
1038 	    if (DEBUG(PARSE)) {
1039 		fprintf(debug_file, "# %s: added Order dependency %s - %s\n",
1040 		    __func__, predecessor->name, gn->name);
1041 		Targ_PrintNode(predecessor, 0);
1042 		Targ_PrintNode(gn, 0);
1043 	    }
1044 	}
1045 	/*
1046 	 * The current source now becomes the predecessor for the next one.
1047 	 */
1048 	predecessor = gn;
1049 	break;
1050 
1051     default:
1052 	/*
1053 	 * If the source is not an attribute, we need to find/create
1054 	 * a node for it. After that we can apply any operator to it
1055 	 * from a special target or link it to its parents, as
1056 	 * appropriate.
1057 	 *
1058 	 * In the case of a source that was the object of a :: operator,
1059 	 * the attribute is applied to all of its instances (as kept in
1060 	 * the 'cohorts' list of the node) or all the cohorts are linked
1061 	 * to all the targets.
1062 	 */
1063 
1064 	/* Find/create the 'src' node and attach to all targets */
1065 	gn = Targ_FindNode(src, TARG_CREATE);
1066 	if (doing_depend)
1067 	    ParseMark(gn);
1068 	if (tOp) {
1069 	    gn->type |= tOp;
1070 	} else {
1071 	    Lst_ForEach(targets, ParseLinkSrc, gn);
1072 	}
1073 	break;
1074     }
1075 }
1076 
1077 /*-
1078  *-----------------------------------------------------------------------
1079  * ParseFindMain --
1080  *	Find a real target in the list and set it to be the main one.
1081  *	Called by ParseDoDependency when a main target hasn't been found
1082  *	yet.
1083  *
1084  * Input:
1085  *	gnp		Node to examine
1086  *
1087  * Results:
1088  *	0 if main not found yet, 1 if it is.
1089  *
1090  * Side Effects:
1091  *	mainNode is changed and Targ_SetMain is called.
1092  *
1093  *-----------------------------------------------------------------------
1094  */
1095 static int
1096 ParseFindMain(void *gnp, void *dummy)
1097 {
1098     GNode   	  *gn = (GNode *)gnp;
1099     if ((gn->type & OP_NOTARGET) == 0) {
1100 	mainNode = gn;
1101 	Targ_SetMain(gn);
1102 	return (dummy ? 1 : 1);
1103     } else {
1104 	return (dummy ? 0 : 0);
1105     }
1106 }
1107 
1108 /*-
1109  *-----------------------------------------------------------------------
1110  * ParseAddDir --
1111  *	Front-end for Dir_AddDir to make sure Lst_ForEach keeps going
1112  *
1113  * Results:
1114  *	=== 0
1115  *
1116  * Side Effects:
1117  *	See Dir_AddDir.
1118  *
1119  *-----------------------------------------------------------------------
1120  */
1121 static int
1122 ParseAddDir(void *path, void *name)
1123 {
1124     (void)Dir_AddDir((Lst) path, (char *)name);
1125     return(0);
1126 }
1127 
1128 /*-
1129  *-----------------------------------------------------------------------
1130  * ParseClearPath --
1131  *	Front-end for Dir_ClearPath to make sure Lst_ForEach keeps going
1132  *
1133  * Results:
1134  *	=== 0
1135  *
1136  * Side Effects:
1137  *	See Dir_ClearPath
1138  *
1139  *-----------------------------------------------------------------------
1140  */
1141 static int
1142 ParseClearPath(void *path, void *dummy)
1143 {
1144     Dir_ClearPath((Lst) path);
1145     return(dummy ? 0 : 0);
1146 }
1147 
1148 /*-
1149  *---------------------------------------------------------------------
1150  * ParseDoDependency  --
1151  *	Parse the dependency line in line.
1152  *
1153  * Input:
1154  *	line		the line to parse
1155  *
1156  * Results:
1157  *	None
1158  *
1159  * Side Effects:
1160  *	The nodes of the sources are linked as children to the nodes of the
1161  *	targets. Some nodes may be created.
1162  *
1163  *	We parse a dependency line by first extracting words from the line and
1164  * finding nodes in the list of all targets with that name. This is done
1165  * until a character is encountered which is an operator character. Currently
1166  * these are only ! and :. At this point the operator is parsed and the
1167  * pointer into the line advanced until the first source is encountered.
1168  * 	The parsed operator is applied to each node in the 'targets' list,
1169  * which is where the nodes found for the targets are kept, by means of
1170  * the ParseDoOp function.
1171  *	The sources are read in much the same way as the targets were except
1172  * that now they are expanded using the wildcarding scheme of the C-Shell
1173  * and all instances of the resulting words in the list of all targets
1174  * are found. Each of the resulting nodes is then linked to each of the
1175  * targets as one of its children.
1176  *	Certain targets are handled specially. These are the ones detailed
1177  * by the specType variable.
1178  *	The storing of transformation rules is also taken care of here.
1179  * A target is recognized as a transformation rule by calling
1180  * Suff_IsTransform. If it is a transformation rule, its node is gotten
1181  * from the suffix module via Suff_AddTransform rather than the standard
1182  * Targ_FindNode in the target module.
1183  *---------------------------------------------------------------------
1184  */
1185 static void
1186 ParseDoDependency(char *line)
1187 {
1188     char  	   *cp;		/* our current position */
1189     GNode 	   *gn = NULL;	/* a general purpose temporary node */
1190     int             op;		/* the operator on the line */
1191     char            savec;	/* a place to save a character */
1192     Lst    	    paths;   	/* List of search paths to alter when parsing
1193 				 * a list of .PATH targets */
1194     int	    	    tOp;    	/* operator from special target */
1195     Lst	    	    sources;	/* list of archive source names after
1196 				 * expansion */
1197     Lst 	    curTargs;	/* list of target names to be found and added
1198 				 * to the targets list */
1199     char	   *lstart = line;
1200 
1201     if (DEBUG(PARSE))
1202 	fprintf(debug_file, "ParseDoDependency(%s)\n", line);
1203     tOp = 0;
1204 
1205     specType = Not;
1206     paths = NULL;
1207 
1208     curTargs = Lst_Init(FALSE);
1209 
1210     /*
1211      * First, grind through the targets.
1212      */
1213 
1214     do {
1215 	/*
1216 	 * Here LINE points to the beginning of the next word, and
1217 	 * LSTART points to the actual beginning of the line.
1218 	 */
1219 
1220 	/* Find the end of the next word. */
1221 	for (cp = line; *cp && (ParseIsEscaped(lstart, cp) ||
1222 		     !(isspace((unsigned char)*cp) ||
1223 			 *cp == '!' || *cp == ':' || *cp == LPAREN));
1224 		 cp++) {
1225 	    if (*cp == '$') {
1226 		/*
1227 		 * Must be a dynamic source (would have been expanded
1228 		 * otherwise), so call the Var module to parse the puppy
1229 		 * so we can safely advance beyond it...There should be
1230 		 * no errors in this, as they would have been discovered
1231 		 * in the initial Var_Subst and we wouldn't be here.
1232 		 */
1233 		int 	length;
1234 		void    *freeIt;
1235 
1236 		(void)Var_Parse(cp, VAR_CMD, VARF_UNDEFERR|VARF_WANTRES,
1237 				&length, &freeIt);
1238 		free(freeIt);
1239 		cp += length-1;
1240 	    }
1241 	}
1242 
1243 	/*
1244 	 * If the word is followed by a left parenthesis, it's the
1245 	 * name of an object file inside an archive (ar file).
1246 	 */
1247 	if (!ParseIsEscaped(lstart, cp) && *cp == LPAREN) {
1248 	    /*
1249 	     * Archives must be handled specially to make sure the OP_ARCHV
1250 	     * flag is set in their 'type' field, for one thing, and because
1251 	     * things like "archive(file1.o file2.o file3.o)" are permissible.
1252 	     * Arch_ParseArchive will set 'line' to be the first non-blank
1253 	     * after the archive-spec. It creates/finds nodes for the members
1254 	     * and places them on the given list, returning SUCCESS if all
1255 	     * went well and FAILURE if there was an error in the
1256 	     * specification. On error, line should remain untouched.
1257 	     */
1258 	    if (Arch_ParseArchive(&line, targets, VAR_CMD) != SUCCESS) {
1259 		Parse_Error(PARSE_FATAL,
1260 			     "Error in archive specification: \"%s\"", line);
1261 		goto out;
1262 	    } else {
1263 		/* Done with this word; on to the next. */
1264 		continue;
1265 	    }
1266 	}
1267 
1268 	if (!*cp) {
1269 	    /*
1270 	     * We got to the end of the line while we were still
1271 	     * looking at targets.
1272 	     *
1273 	     * Ending a dependency line without an operator is a Bozo
1274 	     * no-no.  As a heuristic, this is also often triggered by
1275 	     * undetected conflicts from cvs/rcs merges.
1276 	     */
1277 	    if ((strncmp(line, "<<<<<<", 6) == 0) ||
1278 		(strncmp(line, "======", 6) == 0) ||
1279 		(strncmp(line, ">>>>>>", 6) == 0))
1280 		Parse_Error(PARSE_FATAL,
1281 		    "Makefile appears to contain unresolved cvs/rcs/??? merge conflicts");
1282 	    else
1283 		Parse_Error(PARSE_FATAL, lstart[0] == '.' ? "Unknown directive"
1284 				     : "Need an operator");
1285 	    goto out;
1286 	}
1287 
1288 	/* Insert a null terminator. */
1289 	savec = *cp;
1290 	*cp = '\0';
1291 
1292 	/*
1293 	 * Got the word. See if it's a special target and if so set
1294 	 * specType to match it.
1295 	 */
1296 	if (*line == '.' && isupper ((unsigned char)line[1])) {
1297 	    /*
1298 	     * See if the target is a special target that must have it
1299 	     * or its sources handled specially.
1300 	     */
1301 	    int keywd = ParseFindKeyword(line);
1302 	    if (keywd != -1) {
1303 		if (specType == ExPath && parseKeywords[keywd].spec != ExPath) {
1304 		    Parse_Error(PARSE_FATAL, "Mismatched special targets");
1305 		    goto out;
1306 		}
1307 
1308 		specType = parseKeywords[keywd].spec;
1309 		tOp = parseKeywords[keywd].op;
1310 
1311 		/*
1312 		 * Certain special targets have special semantics:
1313 		 *	.PATH		Have to set the dirSearchPath
1314 		 *			variable too
1315 		 *	.MAIN		Its sources are only used if
1316 		 *			nothing has been specified to
1317 		 *			create.
1318 		 *	.DEFAULT    	Need to create a node to hang
1319 		 *			commands on, but we don't want
1320 		 *			it in the graph, nor do we want
1321 		 *			it to be the Main Target, so we
1322 		 *			create it, set OP_NOTMAIN and
1323 		 *			add it to the list, setting
1324 		 *			DEFAULT to the new node for
1325 		 *			later use. We claim the node is
1326 		 *	    	    	A transformation rule to make
1327 		 *	    	    	life easier later, when we'll
1328 		 *	    	    	use Make_HandleUse to actually
1329 		 *	    	    	apply the .DEFAULT commands.
1330 		 *	.PHONY		The list of targets
1331 		 *	.NOPATH		Don't search for file in the path
1332 		 *	.STALE
1333 		 *	.BEGIN
1334 		 *	.END
1335 		 *	.ERROR
1336 		 *	.INTERRUPT  	Are not to be considered the
1337 		 *			main target.
1338 		 *  	.NOTPARALLEL	Make only one target at a time.
1339 		 *  	.SINGLESHELL	Create a shell for each command.
1340 		 *  	.ORDER	    	Must set initial predecessor to NULL
1341 		 */
1342 		switch (specType) {
1343 		case ExPath:
1344 		    if (paths == NULL) {
1345 			paths = Lst_Init(FALSE);
1346 		    }
1347 		    (void)Lst_AtEnd(paths, dirSearchPath);
1348 		    break;
1349 		case Main:
1350 		    if (!Lst_IsEmpty(create)) {
1351 			specType = Not;
1352 		    }
1353 		    break;
1354 		case Begin:
1355 		case End:
1356 		case Stale:
1357 		case dotError:
1358 		case Interrupt:
1359 		    gn = Targ_FindNode(line, TARG_CREATE);
1360 		    if (doing_depend)
1361 			ParseMark(gn);
1362 		    gn->type |= OP_NOTMAIN|OP_SPECIAL;
1363 		    (void)Lst_AtEnd(targets, gn);
1364 		    break;
1365 		case Default:
1366 		    gn = Targ_NewGN(".DEFAULT");
1367 		    gn->type |= (OP_NOTMAIN|OP_TRANSFORM);
1368 		    (void)Lst_AtEnd(targets, gn);
1369 		    DEFAULT = gn;
1370 		    break;
1371 		case NotParallel:
1372 		    maxJobs = 1;
1373 		    break;
1374 		case SingleShell:
1375 		    compatMake = TRUE;
1376 		    break;
1377 		case Order:
1378 		    predecessor = NULL;
1379 		    break;
1380 		default:
1381 		    break;
1382 		}
1383 	    } else if (strncmp(line, ".PATH", 5) == 0) {
1384 		/*
1385 		 * .PATH<suffix> has to be handled specially.
1386 		 * Call on the suffix module to give us a path to
1387 		 * modify.
1388 		 */
1389 		Lst 	path;
1390 
1391 		specType = ExPath;
1392 		path = Suff_GetPath(&line[5]);
1393 		if (path == NULL) {
1394 		    Parse_Error(PARSE_FATAL,
1395 				 "Suffix '%s' not defined (yet)",
1396 				 &line[5]);
1397 		    goto out;
1398 		} else {
1399 		    if (paths == NULL) {
1400 			paths = Lst_Init(FALSE);
1401 		    }
1402 		    (void)Lst_AtEnd(paths, path);
1403 		}
1404 	    }
1405 	}
1406 
1407 	/*
1408 	 * Have word in line. Get or create its node and stick it at
1409 	 * the end of the targets list
1410 	 */
1411 	if ((specType == Not) && (*line != '\0')) {
1412 	    if (Dir_HasWildcards(line)) {
1413 		/*
1414 		 * Targets are to be sought only in the current directory,
1415 		 * so create an empty path for the thing. Note we need to
1416 		 * use Dir_Destroy in the destruction of the path as the
1417 		 * Dir module could have added a directory to the path...
1418 		 */
1419 		Lst	    emptyPath = Lst_Init(FALSE);
1420 
1421 		Dir_Expand(line, emptyPath, curTargs);
1422 
1423 		Lst_Destroy(emptyPath, Dir_Destroy);
1424 	    } else {
1425 		/*
1426 		 * No wildcards, but we want to avoid code duplication,
1427 		 * so create a list with the word on it.
1428 		 */
1429 		(void)Lst_AtEnd(curTargs, line);
1430 	    }
1431 
1432 	    /* Apply the targets. */
1433 
1434 	    while(!Lst_IsEmpty(curTargs)) {
1435 		char	*targName = (char *)Lst_DeQueue(curTargs);
1436 
1437 		if (!Suff_IsTransform (targName)) {
1438 		    gn = Targ_FindNode(targName, TARG_CREATE);
1439 		} else {
1440 		    gn = Suff_AddTransform(targName);
1441 		}
1442 		if (doing_depend)
1443 		    ParseMark(gn);
1444 
1445 		(void)Lst_AtEnd(targets, gn);
1446 	    }
1447 	} else if (specType == ExPath && *line != '.' && *line != '\0') {
1448 	    Parse_Error(PARSE_WARNING, "Extra target (%s) ignored", line);
1449 	}
1450 
1451 	/* Don't need the inserted null terminator any more. */
1452 	*cp = savec;
1453 
1454 	/*
1455 	 * If it is a special type and not .PATH, it's the only target we
1456 	 * allow on this line...
1457 	 */
1458 	if (specType != Not && specType != ExPath) {
1459 	    Boolean warning = FALSE;
1460 
1461 	    while (*cp && (ParseIsEscaped(lstart, cp) ||
1462 		((*cp != '!') && (*cp != ':')))) {
1463 		if (ParseIsEscaped(lstart, cp) ||
1464 		    (*cp != ' ' && *cp != '\t')) {
1465 		    warning = TRUE;
1466 		}
1467 		cp++;
1468 	    }
1469 	    if (warning) {
1470 		Parse_Error(PARSE_WARNING, "Extra target ignored");
1471 	    }
1472 	} else {
1473 	    while (*cp && isspace ((unsigned char)*cp)) {
1474 		cp++;
1475 	    }
1476 	}
1477 	line = cp;
1478     } while (*line && (ParseIsEscaped(lstart, line) ||
1479 	((*line != '!') && (*line != ':'))));
1480 
1481     /*
1482      * Don't need the list of target names anymore...
1483      */
1484     Lst_Destroy(curTargs, NULL);
1485     curTargs = NULL;
1486 
1487     if (!Lst_IsEmpty(targets)) {
1488 	switch(specType) {
1489 	    default:
1490 		Parse_Error(PARSE_WARNING, "Special and mundane targets don't mix. Mundane ones ignored");
1491 		break;
1492 	    case Default:
1493 	    case Stale:
1494 	    case Begin:
1495 	    case End:
1496 	    case dotError:
1497 	    case Interrupt:
1498 		/*
1499 		 * These four create nodes on which to hang commands, so
1500 		 * targets shouldn't be empty...
1501 		 */
1502 	    case Not:
1503 		/*
1504 		 * Nothing special here -- targets can be empty if it wants.
1505 		 */
1506 		break;
1507 	}
1508     }
1509 
1510     /*
1511      * Have now parsed all the target names. Must parse the operator next. The
1512      * result is left in  op .
1513      */
1514     if (*cp == '!') {
1515 	op = OP_FORCE;
1516     } else if (*cp == ':') {
1517 	if (cp[1] == ':') {
1518 	    op = OP_DOUBLEDEP;
1519 	    cp++;
1520 	} else {
1521 	    op = OP_DEPENDS;
1522 	}
1523     } else {
1524 	Parse_Error(PARSE_FATAL, lstart[0] == '.' ? "Unknown directive"
1525 		    : "Missing dependency operator");
1526 	goto out;
1527     }
1528 
1529     /* Advance beyond the operator */
1530     cp++;
1531 
1532     /*
1533      * Apply the operator to the target. This is how we remember which
1534      * operator a target was defined with. It fails if the operator
1535      * used isn't consistent across all references.
1536      */
1537     Lst_ForEach(targets, ParseDoOp, &op);
1538 
1539     /*
1540      * Onward to the sources.
1541      *
1542      * LINE will now point to the first source word, if any, or the
1543      * end of the string if not.
1544      */
1545     while (*cp && isspace ((unsigned char)*cp)) {
1546 	cp++;
1547     }
1548     line = cp;
1549 
1550     /*
1551      * Several special targets take different actions if present with no
1552      * sources:
1553      *	a .SUFFIXES line with no sources clears out all old suffixes
1554      *	a .PRECIOUS line makes all targets precious
1555      *	a .IGNORE line ignores errors for all targets
1556      *	a .SILENT line creates silence when making all targets
1557      *	a .PATH removes all directories from the search path(s).
1558      */
1559     if (!*line) {
1560 	switch (specType) {
1561 	    case Suffixes:
1562 		Suff_ClearSuffixes();
1563 		break;
1564 	    case Precious:
1565 		allPrecious = TRUE;
1566 		break;
1567 	    case Ignore:
1568 		ignoreErrors = TRUE;
1569 		break;
1570 	    case Silent:
1571 		beSilent = TRUE;
1572 		break;
1573 	    case ExPath:
1574 		Lst_ForEach(paths, ParseClearPath, NULL);
1575 		Dir_SetPATH();
1576 		break;
1577 #ifdef POSIX
1578             case Posix:
1579                 Var_Set("%POSIX", "1003.2", VAR_GLOBAL, 0);
1580                 break;
1581 #endif
1582 	    default:
1583 		break;
1584 	}
1585     } else if (specType == MFlags) {
1586 	/*
1587 	 * Call on functions in main.c to deal with these arguments and
1588 	 * set the initial character to a null-character so the loop to
1589 	 * get sources won't get anything
1590 	 */
1591 	Main_ParseArgLine(line);
1592 	*line = '\0';
1593     } else if (specType == ExShell) {
1594 	if (Job_ParseShell(line) != SUCCESS) {
1595 	    Parse_Error(PARSE_FATAL, "improper shell specification");
1596 	    goto out;
1597 	}
1598 	*line = '\0';
1599     } else if ((specType == NotParallel) || (specType == SingleShell)) {
1600 	*line = '\0';
1601     }
1602 
1603     /*
1604      * NOW GO FOR THE SOURCES
1605      */
1606     if ((specType == Suffixes) || (specType == ExPath) ||
1607 	(specType == Includes) || (specType == Libs) ||
1608 	(specType == Null) || (specType == ExObjdir))
1609     {
1610 	while (*line) {
1611 	    /*
1612 	     * If the target was one that doesn't take files as its sources
1613 	     * but takes something like suffixes, we take each
1614 	     * space-separated word on the line as a something and deal
1615 	     * with it accordingly.
1616 	     *
1617 	     * If the target was .SUFFIXES, we take each source as a
1618 	     * suffix and add it to the list of suffixes maintained by the
1619 	     * Suff module.
1620 	     *
1621 	     * If the target was a .PATH, we add the source as a directory
1622 	     * to search on the search path.
1623 	     *
1624 	     * If it was .INCLUDES, the source is taken to be the suffix of
1625 	     * files which will be #included and whose search path should
1626 	     * be present in the .INCLUDES variable.
1627 	     *
1628 	     * If it was .LIBS, the source is taken to be the suffix of
1629 	     * files which are considered libraries and whose search path
1630 	     * should be present in the .LIBS variable.
1631 	     *
1632 	     * If it was .NULL, the source is the suffix to use when a file
1633 	     * has no valid suffix.
1634 	     *
1635 	     * If it was .OBJDIR, the source is a new definition for .OBJDIR,
1636 	     * and will cause make to do a new chdir to that path.
1637 	     */
1638 	    while (*cp && !isspace ((unsigned char)*cp)) {
1639 		cp++;
1640 	    }
1641 	    savec = *cp;
1642 	    *cp = '\0';
1643 	    switch (specType) {
1644 		case Suffixes:
1645 		    Suff_AddSuffix(line, &mainNode);
1646 		    break;
1647 		case ExPath:
1648 		    Lst_ForEach(paths, ParseAddDir, line);
1649 		    break;
1650 		case Includes:
1651 		    Suff_AddInclude(line);
1652 		    break;
1653 		case Libs:
1654 		    Suff_AddLib(line);
1655 		    break;
1656 		case Null:
1657 		    Suff_SetNull(line);
1658 		    break;
1659 		case ExObjdir:
1660 		    Main_SetObjdir(line);
1661 		    break;
1662 		default:
1663 		    break;
1664 	    }
1665 	    *cp = savec;
1666 	    if (savec != '\0') {
1667 		cp++;
1668 	    }
1669 	    while (*cp && isspace ((unsigned char)*cp)) {
1670 		cp++;
1671 	    }
1672 	    line = cp;
1673 	}
1674 	if (paths) {
1675 	    Lst_Destroy(paths, NULL);
1676 	}
1677 	if (specType == ExPath)
1678 	    Dir_SetPATH();
1679     } else {
1680 	while (*line) {
1681 	    /*
1682 	     * The targets take real sources, so we must beware of archive
1683 	     * specifications (i.e. things with left parentheses in them)
1684 	     * and handle them accordingly.
1685 	     */
1686 	    for (; *cp && !isspace ((unsigned char)*cp); cp++) {
1687 		if ((*cp == LPAREN) && (cp > line) && (cp[-1] != '$')) {
1688 		    /*
1689 		     * Only stop for a left parenthesis if it isn't at the
1690 		     * start of a word (that'll be for variable changes
1691 		     * later) and isn't preceded by a dollar sign (a dynamic
1692 		     * source).
1693 		     */
1694 		    break;
1695 		}
1696 	    }
1697 
1698 	    if (*cp == LPAREN) {
1699 		sources = Lst_Init(FALSE);
1700 		if (Arch_ParseArchive(&line, sources, VAR_CMD) != SUCCESS) {
1701 		    Parse_Error(PARSE_FATAL,
1702 				 "Error in source archive spec \"%s\"", line);
1703 		    goto out;
1704 		}
1705 
1706 		while (!Lst_IsEmpty (sources)) {
1707 		    gn = (GNode *)Lst_DeQueue(sources);
1708 		    ParseDoSrc(tOp, gn->name);
1709 		}
1710 		Lst_Destroy(sources, NULL);
1711 		cp = line;
1712 	    } else {
1713 		if (*cp) {
1714 		    *cp = '\0';
1715 		    cp += 1;
1716 		}
1717 
1718 		ParseDoSrc(tOp, line);
1719 	    }
1720 	    while (*cp && isspace ((unsigned char)*cp)) {
1721 		cp++;
1722 	    }
1723 	    line = cp;
1724 	}
1725     }
1726 
1727     if (mainNode == NULL) {
1728 	/*
1729 	 * If we have yet to decide on a main target to make, in the
1730 	 * absence of any user input, we want the first target on
1731 	 * the first dependency line that is actually a real target
1732 	 * (i.e. isn't a .USE or .EXEC rule) to be made.
1733 	 */
1734 	Lst_ForEach(targets, ParseFindMain, NULL);
1735     }
1736 
1737 out:
1738     if (curTargs)
1739 	    Lst_Destroy(curTargs, NULL);
1740 }
1741 
1742 /*-
1743  *---------------------------------------------------------------------
1744  * Parse_IsVar  --
1745  *	Return TRUE if the passed line is a variable assignment. A variable
1746  *	assignment consists of a single word followed by optional whitespace
1747  *	followed by either a += or an = operator.
1748  *	This function is used both by the Parse_File function and main when
1749  *	parsing the command-line arguments.
1750  *
1751  * Input:
1752  *	line		the line to check
1753  *
1754  * Results:
1755  *	TRUE if it is. FALSE if it ain't
1756  *
1757  * Side Effects:
1758  *	none
1759  *---------------------------------------------------------------------
1760  */
1761 Boolean
1762 Parse_IsVar(char *line)
1763 {
1764     Boolean wasSpace = FALSE;	/* set TRUE if found a space */
1765     char ch;
1766     int level = 0;
1767 #define ISEQOPERATOR(c) \
1768 	(((c) == '+') || ((c) == ':') || ((c) == '?') || ((c) == '!'))
1769 
1770     /*
1771      * Skip to variable name
1772      */
1773     for (;(*line == ' ') || (*line == '\t'); line++)
1774 	continue;
1775 
1776     /* Scan for one of the assignment operators outside a variable expansion */
1777     while ((ch = *line++) != 0) {
1778 	if (ch == '(' || ch == '{') {
1779 	    level++;
1780 	    continue;
1781 	}
1782 	if (ch == ')' || ch == '}') {
1783 	    level--;
1784 	    continue;
1785 	}
1786 	if (level != 0)
1787 	    continue;
1788 	while (ch == ' ' || ch == '\t') {
1789 	    ch = *line++;
1790 	    wasSpace = TRUE;
1791 	}
1792 #ifdef SUNSHCMD
1793 	if (ch == ':' && strncmp(line, "sh", 2) == 0) {
1794 	    line += 2;
1795 	    continue;
1796 	}
1797 #endif
1798 	if (ch == '=')
1799 	    return TRUE;
1800 	if (*line == '=' && ISEQOPERATOR(ch))
1801 	    return TRUE;
1802 	if (wasSpace)
1803 	    return FALSE;
1804     }
1805 
1806     return FALSE;
1807 }
1808 
1809 /*-
1810  *---------------------------------------------------------------------
1811  * Parse_DoVar  --
1812  *	Take the variable assignment in the passed line and do it in the
1813  *	global context.
1814  *
1815  *	Note: There is a lexical ambiguity with assignment modifier characters
1816  *	in variable names. This routine interprets the character before the =
1817  *	as a modifier. Therefore, an assignment like
1818  *	    C++=/usr/bin/CC
1819  *	is interpreted as "C+ +=" instead of "C++ =".
1820  *
1821  * Input:
1822  *	line		a line guaranteed to be a variable assignment.
1823  *			This reduces error checks
1824  *	ctxt		Context in which to do the assignment
1825  *
1826  * Results:
1827  *	none
1828  *
1829  * Side Effects:
1830  *	the variable structure of the given variable name is altered in the
1831  *	global context.
1832  *---------------------------------------------------------------------
1833  */
1834 void
1835 Parse_DoVar(char *line, GNode *ctxt)
1836 {
1837     char	   *cp;	/* pointer into line */
1838     enum {
1839 	VAR_SUBST, VAR_APPEND, VAR_SHELL, VAR_NORMAL
1840     }	    	    type;   	/* Type of assignment */
1841     char            *opc;	/* ptr to operator character to
1842 				 * null-terminate the variable name */
1843     Boolean	   freeCp = FALSE; /* TRUE if cp needs to be freed,
1844 				    * i.e. if any variable expansion was
1845 				    * performed */
1846     int depth;
1847 
1848     /*
1849      * Skip to variable name
1850      */
1851     while ((*line == ' ') || (*line == '\t')) {
1852 	line++;
1853     }
1854 
1855     /*
1856      * Skip to operator character, nulling out whitespace as we go
1857      * XXX Rather than counting () and {} we should look for $ and
1858      * then expand the variable.
1859      */
1860     for (depth = 0, cp = line + 1; depth != 0 || *cp != '='; cp++) {
1861 	if (*cp == '(' || *cp == '{') {
1862 	    depth++;
1863 	    continue;
1864 	}
1865 	if (*cp == ')' || *cp == '}') {
1866 	    depth--;
1867 	    continue;
1868 	}
1869 	if (depth == 0 && isspace ((unsigned char)*cp)) {
1870 	    *cp = '\0';
1871 	}
1872     }
1873     opc = cp-1;		/* operator is the previous character */
1874     *cp++ = '\0';	/* nuke the = */
1875 
1876     /*
1877      * Check operator type
1878      */
1879     switch (*opc) {
1880 	case '+':
1881 	    type = VAR_APPEND;
1882 	    *opc = '\0';
1883 	    break;
1884 
1885 	case '?':
1886 	    /*
1887 	     * If the variable already has a value, we don't do anything.
1888 	     */
1889 	    *opc = '\0';
1890 	    if (Var_Exists(line, ctxt)) {
1891 		return;
1892 	    } else {
1893 		type = VAR_NORMAL;
1894 	    }
1895 	    break;
1896 
1897 	case ':':
1898 	    type = VAR_SUBST;
1899 	    *opc = '\0';
1900 	    break;
1901 
1902 	case '!':
1903 	    type = VAR_SHELL;
1904 	    *opc = '\0';
1905 	    break;
1906 
1907 	default:
1908 #ifdef SUNSHCMD
1909 	    while (opc > line && *opc != ':')
1910 		opc--;
1911 
1912 	    if (strncmp(opc, ":sh", 3) == 0) {
1913 		type = VAR_SHELL;
1914 		*opc = '\0';
1915 		break;
1916 	    }
1917 #endif
1918 	    type = VAR_NORMAL;
1919 	    break;
1920     }
1921 
1922     while (isspace ((unsigned char)*cp)) {
1923 	cp++;
1924     }
1925 
1926     if (type == VAR_APPEND) {
1927 	Var_Append(line, cp, ctxt);
1928     } else if (type == VAR_SUBST) {
1929 	/*
1930 	 * Allow variables in the old value to be undefined, but leave their
1931 	 * invocation alone -- this is done by forcing oldVars to be false.
1932 	 * XXX: This can cause recursive variables, but that's not hard to do,
1933 	 * and this allows someone to do something like
1934 	 *
1935 	 *  CFLAGS = $(.INCLUDES)
1936 	 *  CFLAGS := -I.. $(CFLAGS)
1937 	 *
1938 	 * And not get an error.
1939 	 */
1940 	Boolean	  oldOldVars = oldVars;
1941 
1942 	oldVars = FALSE;
1943 
1944 	/*
1945 	 * make sure that we set the variable the first time to nothing
1946 	 * so that it gets substituted!
1947 	 */
1948 	if (!Var_Exists(line, ctxt))
1949 	    Var_Set(line, "", ctxt, 0);
1950 
1951 	cp = Var_Subst(NULL, cp, ctxt, VARF_WANTRES|VARF_ASSIGN);
1952 	oldVars = oldOldVars;
1953 	freeCp = TRUE;
1954 
1955 	Var_Set(line, cp, ctxt, 0);
1956     } else if (type == VAR_SHELL) {
1957 	char *res;
1958 	const char *error;
1959 
1960 	if (strchr(cp, '$') != NULL) {
1961 	    /*
1962 	     * There's a dollar sign in the command, so perform variable
1963 	     * expansion on the whole thing. The resulting string will need
1964 	     * freeing when we're done, so set freeCmd to TRUE.
1965 	     */
1966 	    cp = Var_Subst(NULL, cp, VAR_CMD, VARF_UNDEFERR|VARF_WANTRES);
1967 	    freeCp = TRUE;
1968 	}
1969 
1970 	res = Cmd_Exec(cp, &error);
1971 	Var_Set(line, res, ctxt, 0);
1972 	free(res);
1973 
1974 	if (error)
1975 	    Parse_Error(PARSE_WARNING, error, cp);
1976     } else {
1977 	/*
1978 	 * Normal assignment -- just do it.
1979 	 */
1980 	Var_Set(line, cp, ctxt, 0);
1981     }
1982     if (strcmp(line, MAKEOVERRIDES) == 0)
1983 	Main_ExportMAKEFLAGS(FALSE);	/* re-export MAKEFLAGS */
1984     else if (strcmp(line, ".CURDIR") == 0) {
1985 	/*
1986 	 * Somone is being (too?) clever...
1987 	 * Let's pretend they know what they are doing and
1988 	 * re-initialize the 'cur' Path.
1989 	 */
1990 	Dir_InitCur(cp);
1991 	Dir_SetPATH();
1992     } else if (strcmp(line, MAKE_JOB_PREFIX) == 0) {
1993 	Job_SetPrefix();
1994     } else if (strcmp(line, MAKE_EXPORTED) == 0) {
1995 	Var_Export(cp, 0);
1996     }
1997     if (freeCp)
1998 	free(cp);
1999 }
2000 
2001 
2002 /*
2003  * ParseMaybeSubMake --
2004  * 	Scan the command string to see if it a possible submake node
2005  * Input:
2006  *	cmd		the command to scan
2007  * Results:
2008  *	TRUE if the command is possibly a submake, FALSE if not.
2009  */
2010 static Boolean
2011 ParseMaybeSubMake(const char *cmd)
2012 {
2013     size_t i;
2014     static struct {
2015 	const char *name;
2016 	size_t len;
2017     } vals[] = {
2018 #define MKV(A)	{	A, sizeof(A) - 1	}
2019 	MKV("${MAKE}"),
2020 	MKV("${.MAKE}"),
2021 	MKV("$(MAKE)"),
2022 	MKV("$(.MAKE)"),
2023 	MKV("make"),
2024     };
2025     for (i = 0; i < sizeof(vals)/sizeof(vals[0]); i++) {
2026 	char *ptr;
2027 	if ((ptr = strstr(cmd, vals[i].name)) == NULL)
2028 	    continue;
2029 	if ((ptr == cmd || !isalnum((unsigned char)ptr[-1]))
2030 	    && !isalnum((unsigned char)ptr[vals[i].len]))
2031 	    return TRUE;
2032     }
2033     return FALSE;
2034 }
2035 
2036 /*-
2037  * ParseAddCmd  --
2038  *	Lst_ForEach function to add a command line to all targets
2039  *
2040  * Input:
2041  *	gnp		the node to which the command is to be added
2042  *	cmd		the command to add
2043  *
2044  * Results:
2045  *	Always 0
2046  *
2047  * Side Effects:
2048  *	A new element is added to the commands list of the node,
2049  *	and the node can be marked as a submake node if the command is
2050  *	determined to be that.
2051  */
2052 static int
2053 ParseAddCmd(void *gnp, void *cmd)
2054 {
2055     GNode *gn = (GNode *)gnp;
2056 
2057     /* Add to last (ie current) cohort for :: targets */
2058     if ((gn->type & OP_DOUBLEDEP) && !Lst_IsEmpty (gn->cohorts))
2059 	gn = (GNode *)Lst_Datum(Lst_Last(gn->cohorts));
2060 
2061     /* if target already supplied, ignore commands */
2062     if (!(gn->type & OP_HAS_COMMANDS)) {
2063 	(void)Lst_AtEnd(gn->commands, cmd);
2064 	if (ParseMaybeSubMake(cmd))
2065 	    gn->type |= OP_SUBMAKE;
2066 	ParseMark(gn);
2067     } else {
2068 #ifdef notyet
2069 	/* XXX: We cannot do this until we fix the tree */
2070 	(void)Lst_AtEnd(gn->commands, cmd);
2071 	Parse_Error(PARSE_WARNING,
2072 		     "overriding commands for target \"%s\"; "
2073 		     "previous commands defined at %s: %d ignored",
2074 		     gn->name, gn->fname, gn->lineno);
2075 #else
2076 	Parse_Error(PARSE_WARNING,
2077 		     "duplicate script for target \"%s\" ignored",
2078 		     gn->name);
2079 	ParseErrorInternal(gn->fname, gn->lineno, PARSE_WARNING,
2080 			    "using previous script for \"%s\" defined here",
2081 			    gn->name);
2082 #endif
2083     }
2084     return(0);
2085 }
2086 
2087 /*-
2088  *-----------------------------------------------------------------------
2089  * ParseHasCommands --
2090  *	Callback procedure for Parse_File when destroying the list of
2091  *	targets on the last dependency line. Marks a target as already
2092  *	having commands if it does, to keep from having shell commands
2093  *	on multiple dependency lines.
2094  *
2095  * Input:
2096  *	gnp		Node to examine
2097  *
2098  * Results:
2099  *	None
2100  *
2101  * Side Effects:
2102  *	OP_HAS_COMMANDS may be set for the target.
2103  *
2104  *-----------------------------------------------------------------------
2105  */
2106 static void
2107 ParseHasCommands(void *gnp)
2108 {
2109     GNode *gn = (GNode *)gnp;
2110     if (!Lst_IsEmpty(gn->commands)) {
2111 	gn->type |= OP_HAS_COMMANDS;
2112     }
2113 }
2114 
2115 /*-
2116  *-----------------------------------------------------------------------
2117  * Parse_AddIncludeDir --
2118  *	Add a directory to the path searched for included makefiles
2119  *	bracketed by double-quotes. Used by functions in main.c
2120  *
2121  * Input:
2122  *	dir		The name of the directory to add
2123  *
2124  * Results:
2125  *	None.
2126  *
2127  * Side Effects:
2128  *	The directory is appended to the list.
2129  *
2130  *-----------------------------------------------------------------------
2131  */
2132 void
2133 Parse_AddIncludeDir(char *dir)
2134 {
2135     (void)Dir_AddDir(parseIncPath, dir);
2136 }
2137 
2138 /*-
2139  *---------------------------------------------------------------------
2140  * ParseDoInclude  --
2141  *	Push to another file.
2142  *
2143  *	The input is the line minus the `.'. A file spec is a string
2144  *	enclosed in <> or "". The former is looked for only in sysIncPath.
2145  *	The latter in . and the directories specified by -I command line
2146  *	options
2147  *
2148  * Results:
2149  *	None
2150  *
2151  * Side Effects:
2152  *	A structure is added to the includes Lst and readProc, lineno,
2153  *	fname and curFILE are altered for the new file
2154  *---------------------------------------------------------------------
2155  */
2156 
2157 static void
2158 Parse_include_file(char *file, Boolean isSystem, Boolean depinc, int silent)
2159 {
2160     struct loadedfile *lf;
2161     char          *fullname;	/* full pathname of file */
2162     char          *newName;
2163     char          *prefEnd, *incdir;
2164     int           fd;
2165     int           i;
2166 
2167     /*
2168      * Now we know the file's name and its search path, we attempt to
2169      * find the durn thing. A return of NULL indicates the file don't
2170      * exist.
2171      */
2172     fullname = file[0] == '/' ? bmake_strdup(file) : NULL;
2173 
2174     if (fullname == NULL && !isSystem) {
2175 	/*
2176 	 * Include files contained in double-quotes are first searched for
2177 	 * relative to the including file's location. We don't want to
2178 	 * cd there, of course, so we just tack on the old file's
2179 	 * leading path components and call Dir_FindFile to see if
2180 	 * we can locate the beast.
2181 	 */
2182 
2183 	incdir = bmake_strdup(curFile->fname);
2184 	prefEnd = strrchr(incdir, '/');
2185 	if (prefEnd != NULL) {
2186 	    *prefEnd = '\0';
2187 	    /* Now do lexical processing of leading "../" on the filename */
2188 	    for (i = 0; strncmp(file + i, "../", 3) == 0; i += 3) {
2189 		prefEnd = strrchr(incdir + 1, '/');
2190 		if (prefEnd == NULL || strcmp(prefEnd, "/..") == 0)
2191 		    break;
2192 		*prefEnd = '\0';
2193 	    }
2194 	    newName = str_concat(incdir, file + i, STR_ADDSLASH);
2195 	    fullname = Dir_FindFile(newName, parseIncPath);
2196 	    if (fullname == NULL)
2197 		fullname = Dir_FindFile(newName, dirSearchPath);
2198 	    free(newName);
2199 	}
2200 	free(incdir);
2201 
2202 	if (fullname == NULL) {
2203 	    /*
2204     	     * Makefile wasn't found in same directory as included makefile.
2205 	     * Search for it first on the -I search path,
2206 	     * then on the .PATH search path, if not found in a -I directory.
2207 	     * If we have a suffix specific path we should use that.
2208 	     */
2209 	    char *suff;
2210 	    Lst	suffPath = NULL;
2211 
2212 	    if ((suff = strrchr(file, '.'))) {
2213 		suffPath = Suff_GetPath(suff);
2214 		if (suffPath != NULL) {
2215 		    fullname = Dir_FindFile(file, suffPath);
2216 		}
2217 	    }
2218 	    if (fullname == NULL) {
2219 		fullname = Dir_FindFile(file, parseIncPath);
2220 		if (fullname == NULL) {
2221 		    fullname = Dir_FindFile(file, dirSearchPath);
2222 		}
2223 	    }
2224 	}
2225     }
2226 
2227     /* Looking for a system file or file still not found */
2228     if (fullname == NULL) {
2229 	/*
2230 	 * Look for it on the system path
2231 	 */
2232 	fullname = Dir_FindFile(file,
2233 		    Lst_IsEmpty(sysIncPath) ? defIncPath : sysIncPath);
2234     }
2235 
2236     if (fullname == NULL) {
2237 	if (!silent)
2238 	    Parse_Error(PARSE_FATAL, "Could not find %s", file);
2239 	return;
2240     }
2241 
2242     /* Actually open the file... */
2243     fd = open(fullname, O_RDONLY);
2244     if (fd == -1) {
2245 	if (!silent)
2246 	    Parse_Error(PARSE_FATAL, "Cannot open %s", fullname);
2247 	free(fullname);
2248 	return;
2249     }
2250 
2251     /* load it */
2252     lf = loadfile(fullname, fd);
2253 
2254     ParseSetIncludedFile();
2255     /* Start reading from this file next */
2256     Parse_SetInput(fullname, 0, -1, loadedfile_nextbuf, lf);
2257     curFile->lf = lf;
2258     if (depinc)
2259 	doing_depend = depinc;		/* only turn it on */
2260 }
2261 
2262 static void
2263 ParseDoInclude(char *line)
2264 {
2265     char          endc;	    	/* the character which ends the file spec */
2266     char          *cp;		/* current position in file spec */
2267     int		  silent = (*line != 'i') ? 1 : 0;
2268     char	  *file = &line[7 + silent];
2269 
2270     /* Skip to delimiter character so we know where to look */
2271     while (*file == ' ' || *file == '\t')
2272 	file++;
2273 
2274     if (*file != '"' && *file != '<') {
2275 	Parse_Error(PARSE_FATAL,
2276 	    ".include filename must be delimited by '\"' or '<'");
2277 	return;
2278     }
2279 
2280     /*
2281      * Set the search path on which to find the include file based on the
2282      * characters which bracket its name. Angle-brackets imply it's
2283      * a system Makefile while double-quotes imply it's a user makefile
2284      */
2285     if (*file == '<') {
2286 	endc = '>';
2287     } else {
2288 	endc = '"';
2289     }
2290 
2291     /* Skip to matching delimiter */
2292     for (cp = ++file; *cp && *cp != endc; cp++)
2293 	continue;
2294 
2295     if (*cp != endc) {
2296 	Parse_Error(PARSE_FATAL,
2297 		     "Unclosed %cinclude filename. '%c' expected",
2298 		     '.', endc);
2299 	return;
2300     }
2301     *cp = '\0';
2302 
2303     /*
2304      * Substitute for any variables in the file name before trying to
2305      * find the thing.
2306      */
2307     file = Var_Subst(NULL, file, VAR_CMD, VARF_WANTRES);
2308 
2309     Parse_include_file(file, endc == '>', (*line == 'd'), silent);
2310     free(file);
2311 }
2312 
2313 
2314 /*-
2315  *---------------------------------------------------------------------
2316  * ParseSetIncludedFile  --
2317  *	Set the .INCLUDEDFROMFILE variable to the contents of .PARSEFILE
2318  *	and the .INCLUDEDFROMDIR variable to the contents of .PARSEDIR
2319  *
2320  * Results:
2321  *	None
2322  *
2323  * Side Effects:
2324  *	The .INCLUDEDFROMFILE variable is overwritten by the contents
2325  *	of .PARSEFILE and the .INCLUDEDFROMDIR variable is overwriten
2326  *	by the contents of .PARSEDIR
2327  *---------------------------------------------------------------------
2328  */
2329 static void
2330 ParseSetIncludedFile(void)
2331 {
2332     char *pf, *fp = NULL;
2333     char *pd, *dp = NULL;
2334 
2335     pf = Var_Value(".PARSEFILE", VAR_GLOBAL, &fp);
2336     Var_Set(".INCLUDEDFROMFILE", pf, VAR_GLOBAL, 0);
2337     pd = Var_Value(".PARSEDIR", VAR_GLOBAL, &dp);
2338     Var_Set(".INCLUDEDFROMDIR", pd, VAR_GLOBAL, 0);
2339 
2340     if (DEBUG(PARSE))
2341 	fprintf(debug_file, "%s: ${.INCLUDEDFROMDIR} = `%s' "
2342 	    "${.INCLUDEDFROMFILE} = `%s'\n", __func__, pd, pf);
2343 
2344     free(fp);
2345     free(dp);
2346 }
2347 /*-
2348  *---------------------------------------------------------------------
2349  * ParseSetParseFile  --
2350  *	Set the .PARSEDIR and .PARSEFILE variables to the dirname and
2351  *	basename of the given filename
2352  *
2353  * Results:
2354  *	None
2355  *
2356  * Side Effects:
2357  *	The .PARSEDIR and .PARSEFILE variables are overwritten by the
2358  *	dirname and basename of the given filename.
2359  *---------------------------------------------------------------------
2360  */
2361 static void
2362 ParseSetParseFile(const char *filename)
2363 {
2364     char *slash, *dirname;
2365     const char *pd, *pf;
2366     int len;
2367 
2368     slash = strrchr(filename, '/');
2369     if (slash == NULL) {
2370 	Var_Set(".PARSEDIR", pd = curdir, VAR_GLOBAL, 0);
2371 	Var_Set(".PARSEFILE", pf = filename, VAR_GLOBAL, 0);
2372 	dirname= NULL;
2373     } else {
2374 	len = slash - filename;
2375 	dirname = bmake_malloc(len + 1);
2376 	memcpy(dirname, filename, len);
2377 	dirname[len] = '\0';
2378 	Var_Set(".PARSEDIR", pd = dirname, VAR_GLOBAL, 0);
2379 	Var_Set(".PARSEFILE", pf = slash + 1, VAR_GLOBAL, 0);
2380     }
2381     if (DEBUG(PARSE))
2382 	fprintf(debug_file, "%s: ${.PARSEDIR} = `%s' ${.PARSEFILE} = `%s'\n",
2383 	    __func__, pd, pf);
2384     free(dirname);
2385 }
2386 
2387 /*
2388  * Track the makefiles we read - so makefiles can
2389  * set dependencies on them.
2390  * Avoid adding anything more than once.
2391  */
2392 
2393 static void
2394 ParseTrackInput(const char *name)
2395 {
2396     char *old;
2397     char *ep;
2398     char *fp = NULL;
2399     size_t name_len = strlen(name);
2400 
2401     old = Var_Value(MAKE_MAKEFILES, VAR_GLOBAL, &fp);
2402     if (old) {
2403 	ep = old + strlen(old) - name_len;
2404 	/* does it contain name? */
2405 	for (; old != NULL; old = strchr(old, ' ')) {
2406 	    if (*old == ' ')
2407 		old++;
2408 	    if (old >= ep)
2409 		break;			/* cannot contain name */
2410 	    if (memcmp(old, name, name_len) == 0
2411 		    && (old[name_len] == 0 || old[name_len] == ' '))
2412 		goto cleanup;
2413 	}
2414     }
2415     Var_Append (MAKE_MAKEFILES, name, VAR_GLOBAL);
2416  cleanup:
2417     if (fp) {
2418 	free(fp);
2419     }
2420 }
2421 
2422 
2423 /*-
2424  *---------------------------------------------------------------------
2425  * Parse_setInput  --
2426  *	Start Parsing from the given source
2427  *
2428  * Results:
2429  *	None
2430  *
2431  * Side Effects:
2432  *	A structure is added to the includes Lst and readProc, lineno,
2433  *	fname and curFile are altered for the new file
2434  *---------------------------------------------------------------------
2435  */
2436 void
2437 Parse_SetInput(const char *name, int line, int fd,
2438 	char *(*nextbuf)(void *, size_t *), void *arg)
2439 {
2440     char *buf;
2441     size_t len;
2442 
2443     if (name == NULL)
2444 	name = curFile->fname;
2445     else
2446 	ParseTrackInput(name);
2447 
2448     if (DEBUG(PARSE))
2449 	fprintf(debug_file, "%s: file %s, line %d, fd %d, nextbuf %p, arg %p\n",
2450 	    __func__, name, line, fd, nextbuf, arg);
2451 
2452     if (fd == -1 && nextbuf == NULL)
2453 	/* sanity */
2454 	return;
2455 
2456     if (curFile != NULL)
2457 	/* Save exiting file info */
2458 	Lst_AtFront(includes, curFile);
2459 
2460     /* Allocate and fill in new structure */
2461     curFile = bmake_malloc(sizeof *curFile);
2462 
2463     /*
2464      * Once the previous state has been saved, we can get down to reading
2465      * the new file. We set up the name of the file to be the absolute
2466      * name of the include file so error messages refer to the right
2467      * place.
2468      */
2469     curFile->fname = bmake_strdup(name);
2470     curFile->lineno = line;
2471     curFile->first_lineno = line;
2472     curFile->nextbuf = nextbuf;
2473     curFile->nextbuf_arg = arg;
2474     curFile->lf = NULL;
2475     curFile->depending = doing_depend;	/* restore this on EOF */
2476 
2477     assert(nextbuf != NULL);
2478 
2479     /* Get first block of input data */
2480     buf = curFile->nextbuf(curFile->nextbuf_arg, &len);
2481     if (buf == NULL) {
2482         /* Was all a waste of time ... */
2483 	if (curFile->fname)
2484 	    free(curFile->fname);
2485 	free(curFile);
2486 	return;
2487     }
2488     curFile->P_str = buf;
2489     curFile->P_ptr = buf;
2490     curFile->P_end = buf+len;
2491 
2492     curFile->cond_depth = Cond_save_depth();
2493     ParseSetParseFile(name);
2494 }
2495 
2496 #ifdef SYSVINCLUDE
2497 /*-
2498  *---------------------------------------------------------------------
2499  * ParseTraditionalInclude  --
2500  *	Push to another file.
2501  *
2502  *	The input is the current line. The file name(s) are
2503  *	following the "include".
2504  *
2505  * Results:
2506  *	None
2507  *
2508  * Side Effects:
2509  *	A structure is added to the includes Lst and readProc, lineno,
2510  *	fname and curFILE are altered for the new file
2511  *---------------------------------------------------------------------
2512  */
2513 static void
2514 ParseTraditionalInclude(char *line)
2515 {
2516     char          *cp;		/* current position in file spec */
2517     int		   done = 0;
2518     int		   silent = (line[0] != 'i') ? 1 : 0;
2519     char	  *file = &line[silent + 7];
2520     char	  *all_files;
2521 
2522     if (DEBUG(PARSE)) {
2523 	    fprintf(debug_file, "%s: %s\n", __func__, file);
2524     }
2525 
2526     /*
2527      * Skip over whitespace
2528      */
2529     while (isspace((unsigned char)*file))
2530 	file++;
2531 
2532     /*
2533      * Substitute for any variables in the file name before trying to
2534      * find the thing.
2535      */
2536     all_files = Var_Subst(NULL, file, VAR_CMD, VARF_WANTRES);
2537 
2538     if (*file == '\0') {
2539 	Parse_Error(PARSE_FATAL,
2540 		     "Filename missing from \"include\"");
2541 	return;
2542     }
2543 
2544     for (file = all_files; !done; file = cp + 1) {
2545 	/* Skip to end of line or next whitespace */
2546 	for (cp = file; *cp && !isspace((unsigned char) *cp); cp++)
2547 	    continue;
2548 
2549 	if (*cp)
2550 	    *cp = '\0';
2551 	else
2552 	    done = 1;
2553 
2554 	Parse_include_file(file, FALSE, FALSE, silent);
2555     }
2556     free(all_files);
2557 }
2558 #endif
2559 
2560 #ifdef GMAKEEXPORT
2561 /*-
2562  *---------------------------------------------------------------------
2563  * ParseGmakeExport  --
2564  *	Parse export <variable>=<value>
2565  *
2566  *	And set the environment with it.
2567  *
2568  * Results:
2569  *	None
2570  *
2571  * Side Effects:
2572  *	None
2573  *---------------------------------------------------------------------
2574  */
2575 static void
2576 ParseGmakeExport(char *line)
2577 {
2578     char	  *variable = &line[6];
2579     char	  *value;
2580 
2581     if (DEBUG(PARSE)) {
2582 	    fprintf(debug_file, "%s: %s\n", __func__, variable);
2583     }
2584 
2585     /*
2586      * Skip over whitespace
2587      */
2588     while (isspace((unsigned char)*variable))
2589 	variable++;
2590 
2591     for (value = variable; *value && *value != '='; value++)
2592 	continue;
2593 
2594     if (*value != '=') {
2595 	Parse_Error(PARSE_FATAL,
2596 		     "Variable/Value missing from \"export\"");
2597 	return;
2598     }
2599     *value++ = '\0';			/* terminate variable */
2600 
2601     /*
2602      * Expand the value before putting it in the environment.
2603      */
2604     value = Var_Subst(NULL, value, VAR_CMD, VARF_WANTRES);
2605     setenv(variable, value, 1);
2606 }
2607 #endif
2608 
2609 /*-
2610  *---------------------------------------------------------------------
2611  * ParseEOF  --
2612  *	Called when EOF is reached in the current file. If we were reading
2613  *	an include file, the includes stack is popped and things set up
2614  *	to go back to reading the previous file at the previous location.
2615  *
2616  * Results:
2617  *	CONTINUE if there's more to do. DONE if not.
2618  *
2619  * Side Effects:
2620  *	The old curFILE, is closed. The includes list is shortened.
2621  *	lineno, curFILE, and fname are changed if CONTINUE is returned.
2622  *---------------------------------------------------------------------
2623  */
2624 static int
2625 ParseEOF(void)
2626 {
2627     char *ptr;
2628     size_t len;
2629 
2630     assert(curFile->nextbuf != NULL);
2631 
2632     doing_depend = curFile->depending;	/* restore this */
2633     /* get next input buffer, if any */
2634     ptr = curFile->nextbuf(curFile->nextbuf_arg, &len);
2635     curFile->P_ptr = ptr;
2636     curFile->P_str = ptr;
2637     curFile->P_end = ptr + len;
2638     curFile->lineno = curFile->first_lineno;
2639     if (ptr != NULL) {
2640 	/* Iterate again */
2641 	return CONTINUE;
2642     }
2643 
2644     /* Ensure the makefile (or loop) didn't have mismatched conditionals */
2645     Cond_restore_depth(curFile->cond_depth);
2646 
2647     if (curFile->lf != NULL) {
2648 	    loadedfile_destroy(curFile->lf);
2649 	    curFile->lf = NULL;
2650     }
2651 
2652     /* Dispose of curFile info */
2653     /* Leak curFile->fname because all the gnodes have pointers to it */
2654     free(curFile->P_str);
2655     free(curFile);
2656 
2657     curFile = Lst_DeQueue(includes);
2658 
2659     if (curFile == NULL) {
2660 	/* We've run out of input */
2661 	Var_Delete(".PARSEDIR", VAR_GLOBAL);
2662 	Var_Delete(".PARSEFILE", VAR_GLOBAL);
2663 	Var_Delete(".INCLUDEDFROMDIR", VAR_GLOBAL);
2664 	Var_Delete(".INCLUDEDFROMFILE", VAR_GLOBAL);
2665 	return DONE;
2666     }
2667 
2668     if (DEBUG(PARSE))
2669 	fprintf(debug_file, "ParseEOF: returning to file %s, line %d\n",
2670 	    curFile->fname, curFile->lineno);
2671 
2672     /* Restore the PARSEDIR/PARSEFILE variables */
2673     ParseSetParseFile(curFile->fname);
2674     return (CONTINUE);
2675 }
2676 
2677 #define PARSE_RAW 1
2678 #define PARSE_SKIP 2
2679 
2680 static char *
2681 ParseGetLine(int flags, int *length)
2682 {
2683     IFile *cf = curFile;
2684     char *ptr;
2685     char ch;
2686     char *line;
2687     char *line_end;
2688     char *escaped;
2689     char *comment;
2690     char *tp;
2691 
2692     /* Loop through blank lines and comment lines */
2693     for (;;) {
2694 	cf->lineno++;
2695 	line = cf->P_ptr;
2696 	ptr = line;
2697 	line_end = line;
2698 	escaped = NULL;
2699 	comment = NULL;
2700 	for (;;) {
2701 	    if (cf->P_end != NULL && ptr == cf->P_end) {
2702 		/* end of buffer */
2703 		ch = 0;
2704 		break;
2705 	    }
2706 	    ch = *ptr;
2707 	    if (ch == 0 || (ch == '\\' && ptr[1] == 0)) {
2708 		if (cf->P_end == NULL)
2709 		    /* End of string (aka for loop) data */
2710 		    break;
2711 		/* see if there is more we can parse */
2712 		while (ptr++ < cf->P_end) {
2713 		    if ((ch = *ptr) == '\n') {
2714 			if (ptr > line && ptr[-1] == '\\')
2715 			    continue;
2716 			Parse_Error(PARSE_WARNING,
2717 			    "Zero byte read from file, skipping rest of line.");
2718 			break;
2719 		    }
2720 		}
2721 		if (cf->nextbuf != NULL) {
2722 		    /*
2723 		     * End of this buffer; return EOF and outer logic
2724 		     * will get the next one. (eww)
2725 		     */
2726 		    break;
2727 		}
2728 		Parse_Error(PARSE_FATAL, "Zero byte read from file");
2729 		return NULL;
2730 	    }
2731 
2732 	    if (ch == '\\') {
2733 		/* Don't treat next character as special, remember first one */
2734 		if (escaped == NULL)
2735 		    escaped = ptr;
2736 		if (ptr[1] == '\n')
2737 		    cf->lineno++;
2738 		ptr += 2;
2739 		line_end = ptr;
2740 		continue;
2741 	    }
2742 	    if (ch == '#' && comment == NULL) {
2743 		/* Remember first '#' for comment stripping */
2744 		/* Unless previous char was '[', as in modifier :[#] */
2745 		if (!(ptr > line && ptr[-1] == '['))
2746 		    comment = line_end;
2747 	    }
2748 	    ptr++;
2749 	    if (ch == '\n')
2750 		break;
2751 	    if (!isspace((unsigned char)ch))
2752 		/* We are not interested in trailing whitespace */
2753 		line_end = ptr;
2754 	}
2755 
2756 	/* Save next 'to be processed' location */
2757 	cf->P_ptr = ptr;
2758 
2759 	/* Check we have a non-comment, non-blank line */
2760 	if (line_end == line || comment == line) {
2761 	    if (ch == 0)
2762 		/* At end of file */
2763 		return NULL;
2764 	    /* Parse another line */
2765 	    continue;
2766 	}
2767 
2768 	/* We now have a line of data */
2769 	*line_end = 0;
2770 
2771 	if (flags & PARSE_RAW) {
2772 	    /* Leave '\' (etc) in line buffer (eg 'for' lines) */
2773 	    *length = line_end - line;
2774 	    return line;
2775 	}
2776 
2777 	if (flags & PARSE_SKIP) {
2778 	    /* Completely ignore non-directives */
2779 	    if (line[0] != '.')
2780 		continue;
2781 	    /* We could do more of the .else/.elif/.endif checks here */
2782 	}
2783 	break;
2784     }
2785 
2786     /* Brutally ignore anything after a non-escaped '#' in non-commands */
2787     if (comment != NULL && line[0] != '\t') {
2788 	line_end = comment;
2789 	*line_end = 0;
2790     }
2791 
2792     /* If we didn't see a '\\' then the in-situ data is fine */
2793     if (escaped == NULL) {
2794 	*length = line_end - line;
2795 	return line;
2796     }
2797 
2798     /* Remove escapes from '\n' and '#' */
2799     tp = ptr = escaped;
2800     escaped = line;
2801     for (; ; *tp++ = ch) {
2802 	ch = *ptr++;
2803 	if (ch != '\\') {
2804 	    if (ch == 0)
2805 		break;
2806 	    continue;
2807 	}
2808 
2809 	ch = *ptr++;
2810 	if (ch == 0) {
2811 	    /* Delete '\\' at end of buffer */
2812 	    tp--;
2813 	    break;
2814 	}
2815 
2816 	if (ch == '#' && line[0] != '\t')
2817 	    /* Delete '\\' from before '#' on non-command lines */
2818 	    continue;
2819 
2820 	if (ch != '\n') {
2821 	    /* Leave '\\' in buffer for later */
2822 	    *tp++ = '\\';
2823 	    /* Make sure we don't delete an escaped ' ' from the line end */
2824 	    escaped = tp + 1;
2825 	    continue;
2826 	}
2827 
2828 	/* Escaped '\n' replace following whitespace with a single ' ' */
2829 	while (ptr[0] == ' ' || ptr[0] == '\t')
2830 	    ptr++;
2831 	ch = ' ';
2832     }
2833 
2834     /* Delete any trailing spaces - eg from empty continuations */
2835     while (tp > escaped && isspace((unsigned char)tp[-1]))
2836 	tp--;
2837 
2838     *tp = 0;
2839     *length = tp - line;
2840     return line;
2841 }
2842 
2843 /*-
2844  *---------------------------------------------------------------------
2845  * ParseReadLine --
2846  *	Read an entire line from the input file. Called only by Parse_File.
2847  *
2848  * Results:
2849  *	A line w/o its newline
2850  *
2851  * Side Effects:
2852  *	Only those associated with reading a character
2853  *---------------------------------------------------------------------
2854  */
2855 static char *
2856 ParseReadLine(void)
2857 {
2858     char 	  *line;    	/* Result */
2859     int	    	  lineLength;	/* Length of result */
2860     int	    	  lineno;	/* Saved line # */
2861     int	    	  rval;
2862 
2863     for (;;) {
2864 	line = ParseGetLine(0, &lineLength);
2865 	if (line == NULL)
2866 	    return NULL;
2867 
2868 	if (line[0] != '.')
2869 	    return line;
2870 
2871 	/*
2872 	 * The line might be a conditional. Ask the conditional module
2873 	 * about it and act accordingly
2874 	 */
2875 	switch (Cond_Eval(line)) {
2876 	case COND_SKIP:
2877 	    /* Skip to next conditional that evaluates to COND_PARSE.  */
2878 	    do {
2879 		line = ParseGetLine(PARSE_SKIP, &lineLength);
2880 	    } while (line && Cond_Eval(line) != COND_PARSE);
2881 	    if (line == NULL)
2882 		break;
2883 	    continue;
2884 	case COND_PARSE:
2885 	    continue;
2886 	case COND_INVALID:    /* Not a conditional line */
2887 	    /* Check for .for loops */
2888 	    rval = For_Eval(line);
2889 	    if (rval == 0)
2890 		/* Not a .for line */
2891 		break;
2892 	    if (rval < 0)
2893 		/* Syntax error - error printed, ignore line */
2894 		continue;
2895 	    /* Start of a .for loop */
2896 	    lineno = curFile->lineno;
2897 	    /* Accumulate loop lines until matching .endfor */
2898 	    do {
2899 		line = ParseGetLine(PARSE_RAW, &lineLength);
2900 		if (line == NULL) {
2901 		    Parse_Error(PARSE_FATAL,
2902 			     "Unexpected end of file in for loop.");
2903 		    break;
2904 		}
2905 	    } while (For_Accum(line));
2906 	    /* Stash each iteration as a new 'input file' */
2907 	    For_Run(lineno);
2908 	    /* Read next line from for-loop buffer */
2909 	    continue;
2910 	}
2911 	return (line);
2912     }
2913 }
2914 
2915 /*-
2916  *-----------------------------------------------------------------------
2917  * ParseFinishLine --
2918  *	Handle the end of a dependency group.
2919  *
2920  * Results:
2921  *	Nothing.
2922  *
2923  * Side Effects:
2924  *	inLine set FALSE. 'targets' list destroyed.
2925  *
2926  *-----------------------------------------------------------------------
2927  */
2928 static void
2929 ParseFinishLine(void)
2930 {
2931     if (inLine) {
2932 	Lst_ForEach(targets, Suff_EndTransform, NULL);
2933 	Lst_Destroy(targets, ParseHasCommands);
2934 	targets = NULL;
2935 	inLine = FALSE;
2936     }
2937 }
2938 
2939 
2940 /*-
2941  *---------------------------------------------------------------------
2942  * Parse_File --
2943  *	Parse a file into its component parts, incorporating it into the
2944  *	current dependency graph. This is the main function and controls
2945  *	almost every other function in this module
2946  *
2947  * Input:
2948  *	name		the name of the file being read
2949  *	fd		Open file to makefile to parse
2950  *
2951  * Results:
2952  *	None
2953  *
2954  * Side Effects:
2955  *	closes fd.
2956  *	Loads. Nodes are added to the list of all targets, nodes and links
2957  *	are added to the dependency graph. etc. etc. etc.
2958  *---------------------------------------------------------------------
2959  */
2960 void
2961 Parse_File(const char *name, int fd)
2962 {
2963     char	  *cp;		/* pointer into the line */
2964     char          *line;	/* the line we're working on */
2965     struct loadedfile *lf;
2966 
2967     lf = loadfile(name, fd);
2968 
2969     inLine = FALSE;
2970     fatals = 0;
2971 
2972     if (name == NULL) {
2973 	    name = "(stdin)";
2974     }
2975 
2976     Parse_SetInput(name, 0, -1, loadedfile_nextbuf, lf);
2977     curFile->lf = lf;
2978 
2979     do {
2980 	for (; (line = ParseReadLine()) != NULL; ) {
2981 	    if (DEBUG(PARSE))
2982 		fprintf(debug_file, "ParseReadLine (%d): '%s'\n",
2983 			curFile->lineno, line);
2984 	    if (*line == '.') {
2985 		/*
2986 		 * Lines that begin with the special character may be
2987 		 * include or undef directives.
2988 		 * On the other hand they can be suffix rules (.c.o: ...)
2989 		 * or just dependencies for filenames that start '.'.
2990 		 */
2991 		for (cp = line + 1; isspace((unsigned char)*cp); cp++) {
2992 		    continue;
2993 		}
2994 		if (strncmp(cp, "include", 7) == 0 ||
2995 			((cp[0] == 'd' || cp[0] == 's' || cp[0] == '-') &&
2996 			    strncmp(&cp[1], "include", 7) == 0)) {
2997 		    ParseDoInclude(cp);
2998 		    continue;
2999 		}
3000 		if (strncmp(cp, "undef", 5) == 0) {
3001 		    char *cp2;
3002 		    for (cp += 5; isspace((unsigned char) *cp); cp++)
3003 			continue;
3004 		    for (cp2 = cp; !isspace((unsigned char) *cp2) &&
3005 				   (*cp2 != '\0'); cp2++)
3006 			continue;
3007 		    *cp2 = '\0';
3008 		    Var_Delete(cp, VAR_GLOBAL);
3009 		    continue;
3010 		} else if (strncmp(cp, "export", 6) == 0) {
3011 		    for (cp += 6; isspace((unsigned char) *cp); cp++)
3012 			continue;
3013 		    Var_Export(cp, 1);
3014 		    continue;
3015 		} else if (strncmp(cp, "unexport", 8) == 0) {
3016 		    Var_UnExport(cp);
3017 		    continue;
3018 		} else if (strncmp(cp, "info", 4) == 0 ||
3019 			   strncmp(cp, "error", 5) == 0 ||
3020 			   strncmp(cp, "warning", 7) == 0) {
3021 		    if (ParseMessage(cp))
3022 			continue;
3023 		}
3024 	    }
3025 
3026 	    if (*line == '\t') {
3027 		/*
3028 		 * If a line starts with a tab, it can only hope to be
3029 		 * a creation command.
3030 		 */
3031 		cp = line + 1;
3032 	      shellCommand:
3033 		for (; isspace ((unsigned char)*cp); cp++) {
3034 		    continue;
3035 		}
3036 		if (*cp) {
3037 		    if (!inLine)
3038 			Parse_Error(PARSE_FATAL,
3039 				     "Unassociated shell command \"%s\"",
3040 				     cp);
3041 		    /*
3042 		     * So long as it's not a blank line and we're actually
3043 		     * in a dependency spec, add the command to the list of
3044 		     * commands of all targets in the dependency spec
3045 		     */
3046 		    if (targets) {
3047 			cp = bmake_strdup(cp);
3048 			Lst_ForEach(targets, ParseAddCmd, cp);
3049 #ifdef CLEANUP
3050 			Lst_AtEnd(targCmds, cp);
3051 #endif
3052 		    }
3053 		}
3054 		continue;
3055 	    }
3056 
3057 #ifdef SYSVINCLUDE
3058 	    if (((strncmp(line, "include", 7) == 0 &&
3059 		    isspace((unsigned char) line[7])) ||
3060 			((line[0] == 's' || line[0] == '-') &&
3061 			    strncmp(&line[1], "include", 7) == 0 &&
3062 			    isspace((unsigned char) line[8]))) &&
3063 		    strchr(line, ':') == NULL) {
3064 		/*
3065 		 * It's an S3/S5-style "include".
3066 		 */
3067 		ParseTraditionalInclude(line);
3068 		continue;
3069 	    }
3070 #endif
3071 #ifdef GMAKEEXPORT
3072 	    if (strncmp(line, "export", 6) == 0 &&
3073 		isspace((unsigned char) line[6]) &&
3074 		strchr(line, ':') == NULL) {
3075 		/*
3076 		 * It's a Gmake "export".
3077 		 */
3078 		ParseGmakeExport(line);
3079 		continue;
3080 	    }
3081 #endif
3082 	    if (Parse_IsVar(line)) {
3083 		ParseFinishLine();
3084 		Parse_DoVar(line, VAR_GLOBAL);
3085 		continue;
3086 	    }
3087 
3088 #ifndef POSIX
3089 	    /*
3090 	     * To make life easier on novices, if the line is indented we
3091 	     * first make sure the line has a dependency operator in it.
3092 	     * If it doesn't have an operator and we're in a dependency
3093 	     * line's script, we assume it's actually a shell command
3094 	     * and add it to the current list of targets.
3095 	     */
3096 	    cp = line;
3097 	    if (isspace((unsigned char) line[0])) {
3098 		while ((*cp != '\0') && isspace((unsigned char) *cp))
3099 		    cp++;
3100 		while (*cp && (ParseIsEscaped(line, cp) ||
3101 			(*cp != ':') && (*cp != '!'))) {
3102 		    cp++;
3103 		}
3104 		if (*cp == '\0') {
3105 		    if (inLine) {
3106 			Parse_Error(PARSE_WARNING,
3107 				     "Shell command needs a leading tab");
3108 			goto shellCommand;
3109 		    }
3110 		}
3111 	    }
3112 #endif
3113 	    ParseFinishLine();
3114 
3115 	    /*
3116 	     * For some reason - probably to make the parser impossible -
3117 	     * a ';' can be used to separate commands from dependencies.
3118 	     * Attempt to avoid ';' inside substitution patterns.
3119 	     */
3120 	    {
3121 		int level = 0;
3122 
3123 		for (cp = line; *cp != 0; cp++) {
3124 		    if (*cp == '\\' && cp[1] != 0) {
3125 			cp++;
3126 			continue;
3127 		    }
3128 		    if (*cp == '$' &&
3129 			(cp[1] == '(' || cp[1] == '{')) {
3130 			level++;
3131 			continue;
3132 		    }
3133 		    if (level > 0) {
3134 			if (*cp == ')' || *cp == '}') {
3135 			    level--;
3136 			    continue;
3137 			}
3138 		    } else if (*cp == ';') {
3139 			break;
3140 		    }
3141 		}
3142 	    }
3143 	    if (*cp != 0)
3144 		/* Terminate the dependency list at the ';' */
3145 		*cp++ = 0;
3146 	    else
3147 		cp = NULL;
3148 
3149 	    /*
3150 	     * We now know it's a dependency line so it needs to have all
3151 	     * variables expanded before being parsed. Tell the variable
3152 	     * module to complain if some variable is undefined...
3153 	     */
3154 	    line = Var_Subst(NULL, line, VAR_CMD, VARF_UNDEFERR|VARF_WANTRES);
3155 
3156 	    /*
3157 	     * Need a non-circular list for the target nodes
3158 	     */
3159 	    if (targets)
3160 		Lst_Destroy(targets, NULL);
3161 
3162 	    targets = Lst_Init(FALSE);
3163 	    inLine = TRUE;
3164 
3165 	    ParseDoDependency(line);
3166 	    free(line);
3167 
3168 	    /* If there were commands after a ';', add them now */
3169 	    if (cp != NULL) {
3170 		goto shellCommand;
3171 	    }
3172 	}
3173 	/*
3174 	 * Reached EOF, but it may be just EOF of an include file...
3175 	 */
3176     } while (ParseEOF() == CONTINUE);
3177 
3178     if (fatals) {
3179 	(void)fflush(stdout);
3180 	(void)fprintf(stderr,
3181 	    "%s: Fatal errors encountered -- cannot continue",
3182 	    progname);
3183 	PrintOnError(NULL, NULL);
3184 	exit(1);
3185     }
3186 }
3187 
3188 /*-
3189  *---------------------------------------------------------------------
3190  * Parse_Init --
3191  *	initialize the parsing module
3192  *
3193  * Results:
3194  *	none
3195  *
3196  * Side Effects:
3197  *	the parseIncPath list is initialized...
3198  *---------------------------------------------------------------------
3199  */
3200 void
3201 Parse_Init(void)
3202 {
3203     mainNode = NULL;
3204     parseIncPath = Lst_Init(FALSE);
3205     sysIncPath = Lst_Init(FALSE);
3206     defIncPath = Lst_Init(FALSE);
3207     includes = Lst_Init(FALSE);
3208 #ifdef CLEANUP
3209     targCmds = Lst_Init(FALSE);
3210 #endif
3211 }
3212 
3213 void
3214 Parse_End(void)
3215 {
3216 #ifdef CLEANUP
3217     Lst_Destroy(targCmds, (FreeProc *)free);
3218     if (targets)
3219 	Lst_Destroy(targets, NULL);
3220     Lst_Destroy(defIncPath, Dir_Destroy);
3221     Lst_Destroy(sysIncPath, Dir_Destroy);
3222     Lst_Destroy(parseIncPath, Dir_Destroy);
3223     Lst_Destroy(includes, NULL);	/* Should be empty now */
3224 #endif
3225 }
3226 
3227 
3228 /*-
3229  *-----------------------------------------------------------------------
3230  * Parse_MainName --
3231  *	Return a Lst of the main target to create for main()'s sake. If
3232  *	no such target exists, we Punt with an obnoxious error message.
3233  *
3234  * Results:
3235  *	A Lst of the single node to create.
3236  *
3237  * Side Effects:
3238  *	None.
3239  *
3240  *-----------------------------------------------------------------------
3241  */
3242 Lst
3243 Parse_MainName(void)
3244 {
3245     Lst           mainList;	/* result list */
3246 
3247     mainList = Lst_Init(FALSE);
3248 
3249     if (mainNode == NULL) {
3250 	Punt("no target to make.");
3251     	/*NOTREACHED*/
3252     } else if (mainNode->type & OP_DOUBLEDEP) {
3253 	(void)Lst_AtEnd(mainList, mainNode);
3254 	Lst_Concat(mainList, mainNode->cohorts, LST_CONCNEW);
3255     }
3256     else
3257 	(void)Lst_AtEnd(mainList, mainNode);
3258     Var_Append(".TARGETS", mainNode->name, VAR_GLOBAL);
3259     return (mainList);
3260 }
3261 
3262 /*-
3263  *-----------------------------------------------------------------------
3264  * ParseMark --
3265  *	Add the filename and lineno to the GNode so that we remember
3266  *	where it was first defined.
3267  *
3268  * Side Effects:
3269  *	None.
3270  *
3271  *-----------------------------------------------------------------------
3272  */
3273 static void
3274 ParseMark(GNode *gn)
3275 {
3276     gn->fname = curFile->fname;
3277     gn->lineno = curFile->lineno;
3278 }
3279