Annotation of src/usr.bin/make/dir.c, Revision 1.58
1.31 espie 1: /* $OpenPackages$ */
1.56 espie 2: /* $OpenBSD$ */
1.7 millert 3: /* $NetBSD: dir.c,v 1.14 1997/03/29 16:51:26 christos Exp $ */
1.1 deraadt 4:
5: /*
1.31 espie 6: * Copyright (c) 1999 Marc Espie.
7: *
8: * Extensive code changes for the OpenBSD project.
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: *
19: * THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS
20: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22: * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBSD
23: * PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30: */
31: /*
1.1 deraadt 32: * Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
33: * Copyright (c) 1988, 1989 by Adam de Boor
34: * Copyright (c) 1989 by Berkeley Softworks
35: * All rights reserved.
36: *
37: * This code is derived from software contributed to Berkeley by
38: * Adam de Boor.
39: *
40: * Redistribution and use in source and binary forms, with or without
41: * modification, are permitted provided that the following conditions
42: * are met:
43: * 1. Redistributions of source code must retain the above copyright
44: * notice, this list of conditions and the following disclaimer.
45: * 2. Redistributions in binary form must reproduce the above copyright
46: * notice, this list of conditions and the following disclaimer in the
47: * documentation and/or other materials provided with the distribution.
1.40 millert 48: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 49: * may be used to endorse or promote products derived from this software
50: * without specific prior written permission.
51: *
52: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
53: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
54: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
55: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
56: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
57: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
58: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
59: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
60: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
61: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
62: * SUCH DAMAGE.
63: */
64:
1.34 espie 65: #include <sys/param.h>
1.32 espie 66: #include <sys/stat.h>
67: #include <dirent.h>
1.34 espie 68: #include <limits.h>
1.25 espie 69: #include <stddef.h>
1.1 deraadt 70: #include <stdio.h>
1.44 espie 71: #include <stdint.h>
1.34 espie 72: #include <stdlib.h>
1.32 espie 73: #include <string.h>
74: #include "config.h"
75: #include "defines.h"
1.25 espie 76: #include "ohash.h"
1.1 deraadt 77: #include "dir.h"
1.32 espie 78: #include "lst.h"
79: #include "memory.h"
80: #include "buf.h"
81: #include "gnode.h"
82: #include "arch.h"
1.55 espie 83: #include "targ.h"
1.32 espie 84: #include "error.h"
85: #include "str.h"
86: #include "timestamp.h"
87:
88:
1.55 espie 89: /* A search path consists of a Lst of PathEntry structures. A Path
1.50 espie 90: * structure has in it the name of the directory and a hash table of all
91: * the files in the directory. This is used to cut down on the number of
92: * system calls necessary to find implicit dependents and their like.
93: * Since these searches are made before any actions are taken, we need not
1.1 deraadt 94: * worry about the directory changing due to creation commands. If this
95: * hampers the style of some makefiles, they must be changed.
96: *
97: * A list of all previously-read directories is kept in the
1.51 espie 98: * knownDirectories cache.
1.1 deraadt 99: *
100: * The need for the caching of whole directories is brought about by
101: * the multi-level transformation code in suff.c, which tends to search
102: * for far more files than regular make does. In the initial
103: * implementation, the amount of time spent performing "stat" calls was
104: * truly astronomical. The problem with hashing at the start is,
105: * of course, that pmake doesn't then detect changes to these directories
106: * during the course of the make. Three possibilities suggest themselves:
107: *
108: * 1) just use stat to test for a file's existence. As mentioned
109: * above, this is very inefficient due to the number of checks
110: * engendered by the multi-level transformation code.
111: * 2) use readdir() and company to search the directories, keeping
112: * them open between checks. I have tried this and while it
113: * didn't slow down the process too much, it could severely
114: * affect the amount of parallelism available as each directory
115: * open would take another file descriptor out of play for
116: * handling I/O for another job. Given that it is only recently
117: * that UNIX OS's have taken to allowing more than 20 or 32
118: * file descriptors for a process, this doesn't seem acceptable
119: * to me.
1.50 espie 120: * 3) record the mtime of the directory in the PathEntry structure and
1.1 deraadt 121: * verify the directory hasn't changed since the contents were
122: * hashed. This will catch the creation or deletion of files,
123: * but not the updating of files. However, since it is the
124: * creation and deletion that is the problem, this could be
125: * a good thing to do. Unfortunately, if the directory (say ".")
126: * were fairly large and changed fairly frequently, the constant
127: * rehashing could seriously degrade performance. It might be
128: * good in such cases to keep track of the number of rehashes
129: * and if the number goes over a (small) limit, resort to using
130: * stat in its place.
131: *
132: * An additional thing to consider is that pmake is used primarily
133: * to create C programs and until recently pcc-based compilers refused
134: * to allow you to specify where the resulting object file should be
135: * placed. This forced all objects to be created in the current
136: * directory. This isn't meant as a full excuse, just an explanation of
137: * some of the reasons for the caching used here.
138: *
139: * One more note: the location of a target's file is only performed
140: * on the downward traversal of the graph and then only for terminal
141: * nodes in the graph. This could be construed as wrong in some cases,
142: * but prevents inadvertent modification of files when the "installed"
143: * directory for a file is provided in the search path.
144: *
145: * Another data structure maintained by this module is an mtime
146: * cache used when the searching of cached directories fails to find
147: * a file. In the past, Dir_FindFile would simply perform an access()
148: * call in such a case to determine if the file could be found using
149: * just the name given. When this hit, however, all that was gained
150: * was the knowledge that the file existed. Given that an access() is
151: * essentially a stat() without the copyout() call, and that the same
152: * filesystem overhead would have to be incurred in Dir_MTime, it made
153: * sense to replace the access() with a stat() and record the mtime
1.31 espie 154: * in a cache for when Dir_MTime was actually called. */
1.1 deraadt 155:
156:
1.55 espie 157: /* several data structures exist to handle caching of directory stuff.
158: *
159: * There is a global hash of directory names (knownDirectories), and each
160: * read directory is kept there as one PathEntry instance. Such a structure
161: * only contains the file names.
162: *
163: * There is a global hash of timestamps (modification times), so care must
164: * be taken of giving the right file names to that structure.
165: *
166: * XXX A set of similar structure should exist at the Target level to properly
167: * take care of VPATH issues.
168: */
169:
170:
171: /* each directory is cached into a PathEntry structure. */
172: struct PathEntry {
173: int refCount; /* ref-counted, can participate to
174: * several paths */
175: struct ohash files; /* hash of name of files in the directory */
176: char name[1]; /* directory name */
177: };
1.27 espie 178:
1.55 espie 179: /* PathEntry kept on knownDirectories */
180: static struct ohash_info dir_info = {
181: offsetof(struct PathEntry, name), NULL, hash_alloc, hash_free,
182: element_alloc
1.27 espie 183: };
184:
1.51 espie 185: static struct ohash knownDirectories; /* cache all open directories */
1.31 espie 186:
1.55 espie 187:
188: /* file names kept in a path entry */
189: static struct ohash_info file_info = {
190: 0, NULL, hash_alloc, hash_free, element_alloc
191: };
192:
193:
1.32 espie 194: /* Global structure used to cache mtimes. XXX We don't cache an mtime
195: * before a caller actually looks up for the given time, because of the
196: * possibility a caller might update the file and invalidate the cache
197: * entry, and we don't look up in this cache except as a last resort.
198: */
1.55 espie 199: struct file_stamp {
200: TIMESTAMP mtime; /* time stamp... */
201: char name[1]; /* ...for that file. */
202: };
203:
1.53 espie 204: static struct ohash mtimes;
1.1 deraadt 205:
1.31 espie 206:
1.53 espie 207: static struct ohash_info stamp_info = {
208: offsetof(struct file_stamp, name), NULL, hash_alloc, hash_free,
1.55 espie 209: element_alloc
210: };
211:
212:
213:
214: static LIST theDefaultPath; /* main search path */
215: Lst defaultPath= &theDefaultPath;
216: struct PathEntry *dot; /* contents of current directory */
1.27 espie 217:
1.26 espie 218:
1.1 deraadt 219:
1.32 espie 220: /* add_file(path, name): add a file name to a path hash structure. */
1.50 espie 221: static void add_file(struct PathEntry *, const char *);
1.32 espie 222: /* n = find_file_hashi(p, name, end, hv): retrieve name in a path hash
223: * structure. */
1.53 espie 224: static char *find_file_hashi(struct PathEntry *, const char *, const char *,
1.50 espie 225: uint32_t);
1.32 espie 226:
227: /* stamp = find_stampi(name, end): look for (name, end) in the global
228: * cache. */
1.31 espie 229: static struct file_stamp *find_stampi(const char *, const char *);
1.32 espie 230: /* record_stamp(name, timestamp): record timestamp for name in the global
231: * cache. */
232: static void record_stamp(const char *, TIMESTAMP);
233:
1.55 espie 234: static bool read_directory(struct PathEntry *);
1.32 espie 235: /* p = DirReaddiri(name, end): read an actual directory, caching results
236: * as we go. */
1.55 espie 237: static struct PathEntry *create_PathEntry(const char *, const char *);
1.32 espie 238: /* Debugging: show a dir name in a path. */
1.31 espie 239: static void DirPrintDir(void *);
1.1 deraadt 240:
1.55 espie 241: /***
242: *** timestamp handling
243: ***/
244:
1.26 espie 245: static void
1.41 espie 246: record_stamp(const char *file, TIMESTAMP t)
1.27 espie 247: {
1.46 espie 248: unsigned int slot;
249: const char *end = NULL;
250: struct file_stamp *n;
251:
252: slot = ohash_qlookupi(&mtimes, file, &end);
253: n = ohash_find(&mtimes, slot);
254: if (n)
255: n->mtime = t;
256: else {
257: n = ohash_create_entry(&stamp_info, file, &end);
258: n->mtime = t;
259: ohash_insert(&mtimes, slot, n);
260: }
1.27 espie 261: }
1.31 espie 262:
1.27 espie 263: static struct file_stamp *
1.41 espie 264: find_stampi(const char *file, const char *efile)
1.27 espie 265: {
1.46 espie 266: return ohash_find(&mtimes, ohash_qlookupi(&mtimes, file, &efile));
1.27 espie 267: }
268:
1.55 espie 269: /***
270: *** PathEntry handling
271: ***/
272:
1.27 espie 273: static void
1.50 espie 274: add_file(struct PathEntry *p, const char *file)
1.26 espie 275: {
1.46 espie 276: unsigned int slot;
277: const char *end = NULL;
278: char *n;
279: struct ohash *h = &p->files;
280:
281: slot = ohash_qlookupi(h, file, &end);
282: n = ohash_find(h, slot);
283: if (n == NULL) {
284: n = ohash_create_entry(&file_info, file, &end);
285: ohash_insert(h, slot, n);
286: }
1.26 espie 287: }
1.31 espie 288:
1.26 espie 289: static char *
1.53 espie 290: find_file_hashi(struct PathEntry *p, const char *file, const char *efile,
1.50 espie 291: uint32_t hv)
1.26 espie 292: {
1.46 espie 293: struct ohash *h = &p->files;
1.26 espie 294:
1.46 espie 295: return ohash_find(h, ohash_lookup_interval(h, file, efile, hv));
1.26 espie 296: }
297:
1.55 espie 298: static bool
299: read_directory(struct PathEntry *p)
300: {
301: DIR *d;
302: struct dirent *dp;
303:
304: if (DEBUG(DIR)) {
305: printf("Caching %s...", p->name);
306: fflush(stdout);
307: }
308:
309: if ((d = opendir(p->name)) == NULL)
310: return false;
311:
312: ohash_init(&p->files, 4, &file_info);
313:
314: while ((dp = readdir(d)) != NULL) {
315: if (dp->d_name[0] == '.' &&
316: (dp->d_name[1] == '\0' ||
317: (dp->d_name[1] == '.' && dp->d_name[2] == '\0')))
318: continue;
319: add_file(p, dp->d_name);
320: }
321: (void)closedir(d);
322: if (DEBUG(DIR))
323: printf("done\n");
324: return true;
325: }
326:
327: /* Read a directory, either from the disk, or from the cache. */
328: static struct PathEntry *
329: create_PathEntry(const char *name, const char *ename)
330: {
331: struct PathEntry *p;
332: unsigned int slot;
333:
334: slot = ohash_qlookupi(&knownDirectories, name, &ename);
335: p = ohash_find(&knownDirectories, slot);
336:
337: if (p == NULL) {
338: p = ohash_create_entry(&dir_info, name, &ename);
339: p->refCount = 0;
340: if (!read_directory(p)) {
341: free(p);
342: return NULL;
343: }
344: ohash_insert(&knownDirectories, slot, p);
345: }
346: p->refCount++;
347: return p;
1.56 espie 348: }
349:
350: char *
351: PathEntry_name(struct PathEntry *p)
352: {
353: return p->name;
1.55 espie 354: }
1.32 espie 355:
356: /* Side Effects: cache the current directory */
1.1 deraadt 357: void
1.41 espie 358: Dir_Init(void)
1.1 deraadt 359: {
1.46 espie 360: char *dotname = ".";
1.32 espie 361:
1.51 espie 362: Static_Lst_Init(defaultPath);
363: ohash_init(&knownDirectories, 4, &dir_info);
1.46 espie 364: ohash_init(&mtimes, 4, &stamp_info);
1.6 millert 365:
1.32 espie 366:
1.55 espie 367: dot = create_PathEntry(dotname, dotname+1);
1.1 deraadt 368:
1.46 espie 369: if (!dot)
370: Fatal("Can't access current directory");
1.1 deraadt 371: }
372:
1.32 espie 373: #ifdef CLEANUP
1.1 deraadt 374: void
1.41 espie 375: Dir_End(void)
1.1 deraadt 376: {
1.50 espie 377: struct PathEntry *p;
1.46 espie 378: unsigned int i;
1.25 espie 379:
1.46 espie 380: dot->refCount--;
381: Dir_Destroy(dot);
1.51 espie 382: Lst_Destroy(defaultPath, Dir_Destroy);
383: for (p = ohash_first(&knownDirectories, &i); p != NULL;
384: p = ohash_next(&knownDirectories, &i))
1.46 espie 385: Dir_Destroy(p);
1.51 espie 386: ohash_delete(&knownDirectories);
1.46 espie 387: free_hash(&mtimes);
1.32 espie 388: }
1.9 espie 389: #endif
1.1 deraadt 390:
1.55 espie 391:
1.1 deraadt 392: /*-
393: *-----------------------------------------------------------------------
1.47 espie 394: * Dir_MatchFilesi --
1.50 espie 395: * Given a pattern and a PathEntry structure, see if any files
1.1 deraadt 396: * match the pattern and add their names to the 'expansions' list if
397: * any do. This is incomplete -- it doesn't take care of patterns like
398: * src / *src / *.c properly (just *.c on any of the directories), but it
399: * will do for now.
400: *-----------------------------------------------------------------------
401: */
1.47 espie 402: void
1.53 espie 403: Dir_MatchFilesi(const char *word, const char *eword, struct PathEntry *p,
1.50 espie 404: Lst expansions)
1.31 espie 405: {
1.46 espie 406: unsigned int search; /* Index into the directory's table */
407: const char *entry; /* Current entry in the table */
408:
409: for (entry = ohash_first(&p->files, &search); entry != NULL;
410: entry = ohash_next(&p->files, &search)) {
411: /* See if the file matches the given pattern. We follow the UNIX
412: * convention that dot files will only be found if the pattern
413: * begins with a dot (the hashing scheme doesn't hash . or ..,
414: * so they won't match `.*'. */
415: if (*word != '.' && *entry == '.')
416: continue;
417: if (Str_Matchi(entry, strchr(entry, '\0'), word, eword))
1.53 espie 418: Lst_AtEnd(expansions,
1.55 espie 419: p == dot ? estrdup(entry) :
1.46 espie 420: Str_concat(p->name, entry, '/'));
421: }
1.1 deraadt 422: }
1.32 espie 423:
1.1 deraadt 424: /*-
425: * Side Effects:
426: * If the file is found in a directory which is not on the path
427: * already (either 'name' is absolute or it is a relative path
428: * [ dir1/.../dirn/file ] which exists below one of the directories
429: * already on the search path), its directory is added to the end
430: * of the path on the assumption that there will be more files in
1.53 espie 431: * that directory later on.
1.1 deraadt 432: */
433: char *
1.53 espie 434: Dir_FindFileComplexi(const char *name, const char *ename, Lst path,
1.45 espie 435: bool checkCurdirFirst)
1.31 espie 436: {
1.50 espie 437: struct PathEntry *p; /* current path member */
1.46 espie 438: char *p1; /* pointer into p->name */
439: const char *p2; /* pointer into name */
440: LstNode ln; /* a list element */
441: char *file; /* the current filename to check */
442: char *temp; /* index into file */
1.54 espie 443: const char *basename;
1.46 espie 444: bool hasSlash;
445: struct stat stb;/* Buffer for stat, if necessary */
1.53 espie 446: struct file_stamp *entry;
1.46 espie 447: /* Entry for mtimes table */
448: uint32_t hv; /* hash value for last component in file name */
449: char *q; /* Str_dupi(name, ename) */
450:
451: /* Find the final component of the name and note whether name has a
452: * slash in it */
1.54 espie 453: basename = Str_rchri(name, ename, '/');
454: if (basename) {
1.46 espie 455: hasSlash = true;
1.54 espie 456: basename++;
1.46 espie 457: } else {
458: hasSlash = false;
1.54 espie 459: basename = name;
1.46 espie 460: }
461:
1.54 espie 462: hv = ohash_interval(basename, &ename);
1.6 millert 463:
1.26 espie 464: if (DEBUG(DIR))
1.46 espie 465: printf("Searching for %s...", name);
1.53 espie 466: /* Unless checkCurDirFirst is false, we always look for
467: * the file in the current directory before anywhere else
1.46 espie 468: * and we always return exactly what the caller specified. */
1.53 espie 469: if (checkCurdirFirst &&
1.54 espie 470: (!hasSlash || (basename - name == 2 && *name == '.')) &&
471: find_file_hashi(dot, basename, ename, hv) != NULL) {
1.46 espie 472: if (DEBUG(DIR))
473: printf("in '.'\n");
474: return Str_dupi(name, ename);
1.1 deraadt 475: }
1.6 millert 476:
1.53 espie 477: /* Then, we look through all the directories on path, seeking one
1.46 espie 478: * containing the final component of name and whose final
1.53 espie 479: * component(s) match name's initial component(s).
480: * If found, we concatenate the directory name and the
1.46 espie 481: * final component and return the resulting string. */
482: for (ln = Lst_First(path); ln != NULL; ln = Lst_Adv(ln)) {
1.50 espie 483: p = (struct PathEntry *)Lst_Datum(ln);
1.46 espie 484: if (DEBUG(DIR))
485: printf("%s...", p->name);
1.54 espie 486: if (find_file_hashi(p, basename, ename, hv) != NULL) {
1.46 espie 487: if (DEBUG(DIR))
488: printf("here...");
489: if (hasSlash) {
1.53 espie 490: /* If the name had a slash, its initial
491: * components and p's final components must
492: * match. This is false if a mismatch is
493: * encountered before all of the initial
494: * components have been checked (p2 > name at
495: * the end of the loop), or we matched only
496: * part of one of the components of p along
1.46 espie 497: * with all the rest of them (*p1 != '/'). */
498: p1 = p->name + strlen(p->name) - 1;
1.54 espie 499: p2 = basename - 2;
1.53 espie 500: while (p2 >= name && p1 >= p->name &&
1.46 espie 501: *p1 == *p2) {
502: p1--;
503: p2--;
504: }
1.53 espie 505: if (p2 >= name ||
1.46 espie 506: (p1 >= p->name && *p1 != '/')) {
507: if (DEBUG(DIR))
508: printf("component mismatch -- continuing...");
509: continue;
510: }
511: }
1.55 espie 512: file = Str_concati(p->name, strchr(p->name, '\0'), basename,
513: ename, '/');
1.46 espie 514: if (DEBUG(DIR))
515: printf("returning %s\n", file);
516: return file;
517: } else if (hasSlash) {
1.53 espie 518: /* If the file has a leading path component and that
519: * component exactly matches the entire name of the
520: * current search directory, we assume the file
1.46 espie 521: * doesn't exist and return NULL. */
1.53 espie 522: for (p1 = p->name, p2 = name; *p1 && *p1 == *p2;
1.46 espie 523: p1++, p2++)
524: continue;
1.54 espie 525: if (*p1 == '\0' && p2 == basename - 1) {
1.46 espie 526: if (DEBUG(DIR))
527: printf("has to be here but isn't -- returning NULL\n");
528: return NULL;
529: }
530: }
531: }
1.27 espie 532:
1.46 espie 533: /* We didn't find the file on any existing member of the path.
534: * If the name doesn't contain a slash, end of story.
1.53 espie 535: * If it does contain a slash, however, it could be in a subdirectory
536: * of one of the members of the search path. (eg., for path=/usr/include
537: * and name=sys/types.h, the above search fails to turn up types.h
1.46 espie 538: * in /usr/include, even though /usr/include/sys/types.h exists).
539: *
540: * We only perform this look-up for non-absolute file names.
541: *
542: * Whenever we score a hit, we assume there will be more matches from
1.53 espie 543: * that directory, and append all but the last component of the
1.46 espie 544: * resulting name onto the search path. */
545: if (!hasSlash) {
1.26 espie 546: if (DEBUG(DIR))
1.46 espie 547: printf("failed.\n");
548: return NULL;
549: }
1.6 millert 550:
1.46 espie 551: if (*name != '/') {
552: bool checkedDot = false;
1.6 millert 553:
1.26 espie 554: if (DEBUG(DIR))
1.46 espie 555: printf("failed. Trying subdirectories...");
556: for (ln = Lst_First(path); ln != NULL; ln = Lst_Adv(ln)) {
1.50 espie 557: p = (struct PathEntry *)Lst_Datum(ln);
1.46 espie 558: if (p != dot)
1.53 espie 559: file = Str_concati(p->name,
1.46 espie 560: strchr(p->name, '\0'), name, ename, '/');
561: else {
1.53 espie 562: /* Checking in dot -- DON'T put a leading
1.46 espie 563: * ./ on the thing. */
564: file = Str_dupi(name, ename);
565: checkedDot = true;
566: }
567: if (DEBUG(DIR))
568: printf("checking %s...", file);
569:
570: if (stat(file, &stb) == 0) {
571: TIMESTAMP mtime;
572:
573: ts_set_from_stat(stb, mtime);
574: if (DEBUG(DIR))
575: printf("got it.\n");
576:
1.53 espie 577: /* We've found another directory to search.
578: * We know there is a slash in 'file'. We
579: * call Dir_AddDiri to add the new directory
580: * onto the existing search path. Once that's
581: * done, we return the file name, knowing that
582: * should a file in this directory ever be
583: * referenced again in such a manner, we will
584: * find it without having to do numerous
1.46 espie 585: * access calls. */
586: temp = strrchr(file, '/');
587: Dir_AddDiri(path, file, temp);
588:
1.53 espie 589: /* Save the modification time so if it's
1.46 espie 590: * needed, we don't have to fetch it again. */
591: if (DEBUG(DIR))
1.53 espie 592: printf("Caching %s for %s\n",
1.49 espie 593: time_to_string(mtime), file);
1.46 espie 594: record_stamp(file, mtime);
595: return file;
596: } else
597: free(file);
598: }
1.6 millert 599:
1.46 espie 600: if (DEBUG(DIR))
601: printf("failed. ");
1.31 espie 602:
1.46 espie 603: if (checkedDot) {
1.53 espie 604: /* Already checked by the given name, since . was in
1.46 espie 605: * the path, so no point in proceeding... */
606: if (DEBUG(DIR))
607: printf("Checked . already, returning NULL\n");
608: return NULL;
609: }
1.1 deraadt 610: }
1.6 millert 611:
1.46 espie 612: /* Didn't find it that way, either. Last resort: look for the file
613: * in the global mtime cache, then on the disk.
614: * If this doesn't succeed, we finally return a NULL pointer.
615: *
616: * We cannot add this directory onto the search path because
617: * of this amusing case:
618: * $(INSTALLDIR)/$(FILE): $(FILE)
619: *
620: * $(FILE) exists in $(INSTALLDIR) but not in the current one.
621: * When searching for $(FILE), we will find it in $(INSTALLDIR)
622: * b/c we added it here. This is not good... */
623: q = Str_dupi(name, ename);
624: if (DEBUG(DIR))
625: printf("Looking for \"%s\"...", q);
1.6 millert 626:
1.46 espie 627: entry = find_stampi(name, ename);
628: if (entry != NULL) {
629: if (DEBUG(DIR))
630: printf("got it (in mtime cache)\n");
631: return q;
632: } else if (stat(q, &stb) == 0) {
633: TIMESTAMP mtime;
1.27 espie 634:
1.46 espie 635: ts_set_from_stat(stb, mtime);
636: if (DEBUG(DIR))
1.49 espie 637: printf("Caching %s for %s\n", time_to_string(mtime), q);
1.46 espie 638: record_stamp(q, mtime);
639: return q;
640: } else {
641: if (DEBUG(DIR))
642: printf("failed. Returning NULL\n");
643: free(q);
644: return NULL;
645: }
1.1 deraadt 646: }
647:
648: void
1.41 espie 649: Dir_AddDiri(Lst path, const char *name, const char *ename)
1.1 deraadt 650: {
1.50 espie 651: struct PathEntry *p;
1.6 millert 652:
1.55 espie 653: p = create_PathEntry(name, ename);
1.46 espie 654: if (p == NULL)
655: return;
1.55 espie 656: if (p->refCount == 1)
1.46 espie 657: Lst_AtEnd(path, p);
658: else if (!Lst_AddNew(path, p))
659: return;
1.1 deraadt 660: }
661:
1.19 espie 662: void *
1.41 espie 663: Dir_CopyDir(void *p)
1.1 deraadt 664: {
1.50 espie 665: ((struct PathEntry *)p)->refCount++;
1.46 espie 666: return p;
1.1 deraadt 667: }
668:
669: /*-
670: *-----------------------------------------------------------------------
671: * Dir_MakeFlags --
672: * Make a string by taking all the directories in the given search
673: * path and preceding them by the given flag. Used by the suffix
674: * module to create variables for compilers based on suffix search
675: * paths.
676: *
677: * Results:
678: * The string mentioned above. Note that there is no space between
679: * the given flag and each directory. The empty string is returned if
680: * Things don't go well.
681: *-----------------------------------------------------------------------
682: */
683: char *
1.41 espie 684: Dir_MakeFlags(const char *flag, Lst path)
1.1 deraadt 685: {
1.46 espie 686: LstNode ln;
687: BUFFER buf;
1.6 millert 688:
1.46 espie 689: Buf_Init(&buf, 0);
1.6 millert 690:
1.46 espie 691: for (ln = Lst_First(path); ln != NULL; ln = Lst_Adv(ln)) {
692: Buf_AddString(&buf, flag);
1.50 espie 693: Buf_AddString(&buf, ((struct PathEntry *)Lst_Datum(ln))->name);
1.46 espie 694: Buf_AddSpace(&buf);
695: }
1.6 millert 696:
1.46 espie 697: return Buf_Retrieve(&buf);
1.1 deraadt 698: }
699:
700: void
1.41 espie 701: Dir_Destroy(void *pp)
1.1 deraadt 702: {
1.50 espie 703: struct PathEntry *p = (struct PathEntry *)pp;
1.1 deraadt 704:
1.46 espie 705: if (--p->refCount == 0) {
1.53 espie 706: ohash_remove(&knownDirectories,
1.51 espie 707: ohash_qlookup(&knownDirectories, p->name));
1.46 espie 708: free_hash(&p->files);
709: free(p);
710: }
1.1 deraadt 711: }
712:
713: /*-
714: *-----------------------------------------------------------------------
715: * Dir_Concat --
716: * Concatenate two paths, adding the second to the end of the first.
717: * Makes sure to avoid duplicates.
718: *
719: * Side Effects:
720: * Reference counts for added dirs are upped.
721: *-----------------------------------------------------------------------
722: */
723: void
1.41 espie 724: Dir_Concat(Lst path1, Lst path2)
1.1 deraadt 725: {
1.46 espie 726: LstNode ln;
1.55 espie 727: struct PathEntry *p;
1.1 deraadt 728:
1.46 espie 729: for (ln = Lst_First(path2); ln != NULL; ln = Lst_Adv(ln)) {
1.50 espie 730: p = (struct PathEntry *)Lst_Datum(ln);
1.46 espie 731: if (Lst_AddNew(path1, p))
732: p->refCount++;
733: }
1.1 deraadt 734: }
735:
1.31 espie 736: static void
1.41 espie 737: DirPrintDir(void *p)
1.6 millert 738: {
1.50 espie 739: printf("%s ", ((struct PathEntry *)p)->name);
1.1 deraadt 740: }
741:
742: void
1.41 espie 743: Dir_PrintPath(Lst path)
1.1 deraadt 744: {
1.46 espie 745: Lst_Every(path, DirPrintDir);
1.29 espie 746: }
747:
1.32 espie 748: TIMESTAMP
1.41 espie 749: Dir_MTime(GNode *gn)
1.32 espie 750: {
1.46 espie 751: char *fullName;
752: struct stat stb;
753: struct file_stamp *entry;
754: unsigned int slot;
755: TIMESTAMP mtime;
756:
1.57 espie 757: if (gn->type & OP_PHONY)
758: return gn->mtime;
759:
1.46 espie 760: if (gn->type & OP_ARCHV)
761: return Arch_MTime(gn);
762:
763: if (gn->path == NULL) {
1.51 espie 764: fullName = Dir_FindFile(gn->name, defaultPath);
1.46 espie 765: if (fullName == NULL)
766: fullName = estrdup(gn->name);
1.32 espie 767: } else
1.46 espie 768: fullName = gn->path;
769:
770: slot = ohash_qlookup(&mtimes, fullName);
771: entry = ohash_find(&mtimes, slot);
772: if (entry != NULL) {
773: /* Only do this once -- the second time folks are checking to
1.53 espie 774: * see if the file was actually updated, so we need to
1.46 espie 775: * actually go to the file system. */
776: if (DEBUG(DIR))
777: printf("Using cached time %s for %s\n",
1.49 espie 778: time_to_string(entry->mtime), fullName);
1.46 espie 779: mtime = entry->mtime;
780: free(entry);
781: ohash_remove(&mtimes, slot);
782: } else if (stat(fullName, &stb) == 0)
783: ts_set_from_stat(stb, mtime);
784: else {
785: if (gn->type & OP_MEMBER) {
786: if (fullName != gn->path)
787: free(fullName);
788: return Arch_MemMTime(gn);
789: } else
790: ts_set_out_of_date(mtime);
791: }
792: if (fullName && gn->path == NULL)
793: gn->path = fullName;
1.29 espie 794:
1.46 espie 795: gn->mtime = mtime;
796: return gn->mtime;
1.1 deraadt 797: }
1.32 espie 798:
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