1 /* Implementation of pattern-matching file search paths for GNU Make.
2 Copyright (C) 1988-2022 Free Software Foundation, Inc.
3 This file is part of GNU Make.
5 GNU Make is free software; you can redistribute it and/or modify it under the
6 terms of the GNU General Public License as published by the Free Software
7 Foundation; either version 3 of the License, or (at your option) any later
10 GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
11 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
12 A PARTICULAR PURPOSE. See the GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License along with
15 this program. If not, see <https://www.gnu.org/licenses/>. */
21 #include "pathstuff.h"
25 /* Structure used to represent a selective VPATH searchpath. */
29 struct vpath *next; /* Pointer to next struct in the linked list. */
30 const char *pattern; /* The pattern to match. */
31 const char *percent; /* Pointer into 'pattern' where the '%' is. */
32 size_t patlen; /* Length of the pattern. */
33 const char **searchpath; /* Null-terminated list of directories. */
34 size_t maxlen; /* Maximum length of any entry in the list. */
37 /* Linked-list of all selective VPATHs. */
39 static struct vpath *vpaths;
41 /* Structure for the general VPATH given in the variable. */
43 static struct vpath *general_vpath;
45 /* Structure for GPATH given in the variable. */
47 static struct vpath *gpaths;
50 /* Reverse the chain of selective VPATH lists so they will be searched in the
51 order given in the makefiles and construct the list from the VPATH
55 build_vpath_lists (void)
57 struct vpath *new = 0;
58 struct vpath *old, *nexto;
61 /* Reverse the chain. */
62 for (old = vpaths; old != 0; old = nexto)
71 /* If there is a VPATH variable with a nonnull value, construct the
72 general VPATH list from it. We use variable_expand rather than just
73 calling lookup_variable so that it will be recursively expanded. */
76 /* Turn off --warn-undefined-variables while we expand SHELL and IFS. */
77 int save = warn_undefined_variables_flag;
78 warn_undefined_variables_flag = 0;
80 p = variable_expand ("$(strip $(VPATH))");
82 warn_undefined_variables_flag = save;
87 /* Save the list of vpaths. */
88 struct vpath *save_vpaths = vpaths;
91 /* Empty 'vpaths' so the new one will have no next, and 'vpaths'
92 will still be nil if P contains no existing directories. */
96 construct_vpath_list (gp, p);
98 /* Store the created path as the general path,
99 and restore the old list of vpaths. */
100 general_vpath = vpaths;
101 vpaths = save_vpaths;
104 /* If there is a GPATH variable with a nonnull value, construct the
105 GPATH list from it. We use variable_expand rather than just
106 calling lookup_variable so that it will be recursively expanded. */
109 /* Turn off --warn-undefined-variables while we expand SHELL and IFS. */
110 int save = warn_undefined_variables_flag;
111 warn_undefined_variables_flag = 0;
113 p = variable_expand ("$(strip $(GPATH))");
115 warn_undefined_variables_flag = save;
120 /* Save the list of vpaths. */
121 struct vpath *save_vpaths = vpaths;
124 /* Empty 'vpaths' so the new one will have no next, and 'vpaths'
125 will still be nil if P contains no existing directories. */
129 construct_vpath_list (gp, p);
131 /* Store the created path as the GPATH,
132 and restore the old list of vpaths. */
134 vpaths = save_vpaths;
138 /* Construct the VPATH listing for the PATTERN and DIRPATH given.
140 This function is called to generate selective VPATH lists and also for
141 the general VPATH list (which is in fact just a selective VPATH that
142 is applied to everything). The returned pointer is either put in the
143 linked list of all selective VPATH lists or in the GENERAL_VPATH
146 If DIRPATH is nil, remove all previous listings with the same
147 pattern. If PATTERN is nil, remove all VPATH listings. Existing
148 and readable directories that are not "." given in the DIRPATH
149 separated by the path element separator (defined in makeint.h) are
150 loaded into the directory hash table if they are not there already
151 and put in the VPATH searchpath for the given pattern with trailing
152 slashes stripped off if present (and if the directory is not the
153 root, "/"). The length of the longest entry in the list is put in
154 the structure as well. The new entry will be at the head of the
158 construct_vpath_list (char *pattern, char *dirpath)
164 unsigned int maxelem;
165 const char *percent = NULL;
168 percent = find_percent (pattern);
172 /* Remove matching listings. */
173 struct vpath *path, *lastpath;
179 struct vpath *next = path->next;
182 || (((percent == 0 && path->percent == 0)
183 || (percent - pattern == path->percent - path->pattern))
184 && streq (pattern, path->pattern)))
186 /* Remove it from the linked list. */
190 lastpath->next = next;
192 /* Free its unused storage. */
193 /* MSVC erroneously warns without a cast here. */
194 free ((void *)path->searchpath);
207 convert_vpath_to_windows32 (dirpath, ';');
210 /* Skip over any initial separators and blanks. */
211 while (STOP_SET (*dirpath, MAP_BLANK|MAP_PATHSEP))
214 /* Figure out the maximum number of VPATH entries and put it in
215 MAXELEM. We start with 2, one before the first separator and one
216 nil (the list terminator) and increment our estimated number for
217 each separator or blank we find. */
221 if (STOP_SET (*p++, MAP_BLANK|MAP_PATHSEP))
224 vpath = xmalloc (maxelem * sizeof (const char *));
234 /* Find the end of this entry. */
237 #if defined(HAVE_DOS_PATHS) && (PATH_SEPARATOR_CHAR == ':')
238 /* Platforms whose PATH_SEPARATOR_CHAR is ':' and which
239 also define HAVE_DOS_PATHS would like us to recognize
240 colons after the drive letter in the likes of
241 "D:/foo/bar:C:/xyzzy". */
242 && (*p != PATH_SEPARATOR_CHAR || (p == v + 1 && ISDIRSEP (p[1])))
244 && *p != PATH_SEPARATOR_CHAR
250 /* Make sure there's no trailing slash,
251 but still allow "/" as a directory. */
252 #if defined(__MSDOS__) || defined(__EMX__) || defined(HAVE_DOS_PATHS)
253 /* We need also to leave alone a trailing slash in "d:/". */
254 if (len > 3 || (len > 1 && v[1] != ':'))
256 if (len > 1 && p[-1] == '/')
259 /* Put the directory on the vpath list. */
260 if (len > 1 || *v != '.')
262 vpath[elem++] = dir_name (strcache_add_len (v, len));
267 /* Skip over separators and blanks between entries. */
268 while (STOP_SET (*p, MAP_BLANK|MAP_PATHSEP))
275 /* ELEM is now incremented one element past the last
276 entry, to where the nil-pointer terminator goes.
277 Usually this is maxelem - 1. If not, shrink down. */
278 if (elem < (maxelem - 1))
279 vpath = xrealloc ((void *)vpath, (elem+1) * sizeof (const char *));
281 /* Put the nil-pointer terminator on the end of the VPATH list. */
284 /* Construct the vpath structure and put it into the linked list. */
285 path = xmalloc (sizeof (struct vpath));
286 path->searchpath = vpath;
287 path->maxlen = maxvpath;
291 /* Set up the members. */
292 path->pattern = strcache_add (pattern);
293 path->patlen = strlen (pattern);
294 path->percent = percent ? path->pattern + (percent - pattern) : 0;
297 /* There were no entries, so free whatever space we allocated. */
298 /* MSVC erroneously warns without a cast here. */
299 free ((void *)vpath);
302 /* Search the GPATH list for a pathname string that matches the one passed
303 in. If it is found, return 1. Otherwise we return 0. */
306 gpath_search (const char *file, size_t len)
308 if (gpaths && (len <= gpaths->maxlen))
311 for (gp = gpaths->searchpath; *gp != NULL; ++gp)
312 if (strneq (*gp, file, len) && (*gp)[len] == '\0')
320 /* Search the given VPATH list for a directory where the name pointed to by
321 FILE exists. If it is found, we return a cached name of the existing file
322 and set *MTIME_PTR (if MTIME_PTR is not NULL) to its modtime (or zero if no
323 stat call was done). Also set the matching directory index in PATH_INDEX
324 if it is not NULL. Otherwise we return NULL. */
327 selective_vpath_search (struct vpath *path, const char *file,
328 FILE_TIMESTAMP *mtime_ptr, unsigned int* path_index)
333 const char *filename;
334 const char **vpath = path->searchpath;
335 size_t maxvpath = path->maxlen;
337 size_t flen, name_dplen;
340 /* Find out if *FILE is a target.
341 If and only if it is NOT a target, we will accept prospective
342 files that don't exist but are mentioned in a makefile. */
344 struct file *f = lookup_file (file);
345 not_target = f == 0 || !f->is_target;
348 flen = strlen (file);
350 /* Split *FILE into a directory prefix and a name-within-directory.
351 NAME_DPLEN gets the length of the prefix; FILENAME gets the pointer to
352 the name-within-directory and FLEN is its length. */
354 n = strrchr (file, '/');
355 #ifdef HAVE_DOS_PATHS
356 /* We need the rightmost slash or backslash. */
358 const char *bslash = strrchr (file, '\\');
359 if (!n || bslash > n)
363 name_dplen = n != 0 ? n - file : 0;
364 filename = name_dplen > 0 ? n + 1 : file;
366 flen -= name_dplen + 1;
368 /* Get enough space for the biggest VPATH entry, a slash, the directory
369 prefix that came with FILE, another slash (although this one may not
370 always be necessary), the filename, and a null terminator. */
371 name = alloca (maxvpath + 1 + name_dplen + 1 + flen + 1);
373 /* Try each VPATH entry. */
374 for (i = 0; vpath[i] != 0; ++i)
376 int exists_in_cache = 0;
378 size_t vlen = strlen (vpath[i]);
380 /* Put the next VPATH entry into NAME at P and increment P past it. */
381 p = mempcpy (p, vpath[i], vlen);
383 /* Add the directory prefix already in *FILE. */
389 /* VMS: if this is not in VMS format, treat as Unix format */
390 if ((*p != ':') && (*p != ']') && (*p != '>'))
393 p = mempcpy (p, file, name_dplen);
396 #ifdef HAVE_DOS_PATHS
397 /* Cause the next if to treat backslash and slash alike. */
398 if (p != name && p[-1] == '\\' )
401 /* Now add the name-within-directory at the end of NAME. */
403 if (p != name && p[-1] != '/')
406 memcpy (p + 1, filename, flen + 1);
410 /* VMS use a slash if no directory terminator present */
411 if (p != name && p[-1] != '/' && p[-1] != ':' &&
412 p[-1] != '>' && p[-1] != ']')
415 memcpy (p + 1, filename, flen + 1);
419 memcpy (p, filename, flen + 1);
421 /* Check if the file is mentioned in a makefile. If *FILE is not
422 a target, that is enough for us to decide this file exists.
423 If *FILE is a target, then the file must be mentioned in the
424 makefile also as a target to be chosen.
426 The restriction that *FILE must not be a target for a
427 makefile-mentioned file to be chosen was added by an
428 inadequately commented change in July 1990; I am not sure off
429 hand what problem it fixes.
431 In December 1993 I loosened this restriction to allow a file
432 to be chosen if it is mentioned as a target in a makefile. This
435 Special handling for -W / -o: make sure we preserve the special
436 values here. Actually this whole thing is a little bogus: I think
437 we should ditch the name/hname thing and look into the renamed
438 capability that already exists for files: that is, have a new struct
439 file* entry for the VPATH-found file, and set the renamed field if
443 struct file *f = lookup_file (name);
446 exists = not_target || f->is_target;
447 if (exists && mtime_ptr
448 && (f->last_mtime == OLD_MTIME || f->last_mtime == NEW_MTIME))
450 *mtime_ptr = f->last_mtime;
458 /* That file wasn't mentioned in the makefile.
459 See if it actually exists. */
462 /* For VMS syntax just use the original vpath */
464 exists_in_cache = exists = dir_file_exists_p (vpath[i], filename);
468 /* Clobber a null into the name at the last slash.
469 Now NAME is the name of the directory to look in. */
471 /* We know the directory is in the hash table now because either
472 construct_vpath_list or the code just above put it there.
473 Does the file we seek exist in it? */
474 exists_in_cache = exists = dir_file_exists_p (name, filename);
480 /* The file is in the directory cache.
481 Now check that it actually exists in the filesystem.
482 The cache may be out of date. When vpath thinks a file
483 exists, but stat fails for it, confusion results in the
489 /* Put the slash back in NAME. */
492 /* If the slash was removed, put it back */
497 if (exists_in_cache) /* Makefile-mentioned file need not exist. */
501 EINTRLOOP (e, stat (name, &st)); /* Does it really exist? */
508 /* Store the modtime into *MTIME_PTR for the caller. */
511 *mtime_ptr = FILE_TIMESTAMP_STAT_MODTIME (name, st);
516 /* We have found a file.
517 If we get here and mtime_ptr hasn't been set, record
518 UNKNOWN_MTIME to indicate this. */
520 *mtime_ptr = UNKNOWN_MTIME;
522 /* Store the name we found and return it. */
527 return strcache_add_len (name, (p + 1 - name) + flen);
535 /* Search the VPATH list whose pattern matches FILE for a directory where FILE
536 exists. If it is found, return the cached name of an existing file, and
537 set *MTIME_PTR (if MTIME_PTR is not NULL) to its modtime (or zero if no
538 stat call was done). Also set the matching directory index in VPATH_INDEX
539 and PATH_INDEX if they are not NULL. Otherwise we return 0. */
542 vpath_search (const char *file, FILE_TIMESTAMP *mtime_ptr,
543 unsigned int* vpath_index, unsigned int* path_index)
547 /* If there are no VPATH entries or FILENAME starts at the root,
548 there is nothing we can do. */
551 #ifdef HAVE_DOS_PATHS
552 || file[0] == '\\' || file[1] == ':'
554 || (vpaths == 0 && general_vpath == 0))
563 for (v = vpaths; v != 0; v = v->next)
565 if (pattern_matches (v->pattern, v->percent, file))
567 const char *p = selective_vpath_search (
568 v, file, mtime_ptr, path_index);
578 if (general_vpath != 0)
580 const char *p = selective_vpath_search (
581 general_vpath, file, mtime_ptr, path_index);
592 /* Print the data base of VPATH search paths. */
595 print_vpath_data_base (void)
597 unsigned int nvpaths;
600 puts (_("\n# VPATH Search Paths\n"));
603 for (v = vpaths; v != 0; v = v->next)
609 printf ("vpath %s ", v->pattern);
611 for (i = 0; v->searchpath[i] != 0; ++i)
612 printf ("%s%c", v->searchpath[i],
613 v->searchpath[i + 1] == 0 ? '\n' : PATH_SEPARATOR_CHAR);
617 puts (_("# No 'vpath' search paths."));
619 printf (_("\n# %u 'vpath' search paths.\n"), nvpaths);
621 if (general_vpath == 0)
622 puts (_("\n# No general ('VPATH' variable) search path."));
625 const char **path = general_vpath->searchpath;
628 fputs (_("\n# General ('VPATH' variable) search path:\n# "), stdout);
630 for (i = 0; path[i] != 0; ++i)
631 printf ("%s%c", path[i],
632 path[i + 1] == 0 ? '\n' : PATH_SEPARATOR_CHAR);