/* Implementation of pattern-matching file search paths for GNU Make.
Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software
Foundation, Inc.
This file is part of GNU Make.
GNU Make is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 2, or (at your option) any later version.
GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
GNU Make; see the file COPYING. If not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. */
#include "make.h"
#include "filedef.h"
#include "variable.h"
#ifdef WINDOWS32
#include "pathstuff.h"
#endif
/* Structure used to represent a selective VPATH searchpath. */
struct vpath
{
struct vpath *next; /* Pointer to next struct in the linked list. */
char *pattern; /* The pattern to match. */
char *percent; /* Pointer into `pattern' where the `%' is. */
unsigned int patlen;/* Length of the pattern. */
char **searchpath; /* Null-terminated list of directories. */
unsigned int maxlen;/* Maximum length of any entry in the list. */
};
/* Linked-list of all selective VPATHs. */
static struct vpath *vpaths;
/* Structure for the general VPATH given in the variable. */
static struct vpath *general_vpath;
/* Structure for GPATH given in the variable. */
static struct vpath *gpaths;
static int selective_vpath_search PARAMS ((struct vpath *path, char **file, FILE_TIMESTAMP *mtime_ptr));
/* Reverse the chain of selective VPATH lists so they
will be searched in the order given in the makefiles
and construct the list from the VPATH variable. */
void
build_vpath_lists ()
{
register struct vpath *new = 0;
register struct vpath *old, *nexto;
register char *p;
/* Reverse the chain. */
for (old = vpaths; old != 0; old = nexto)
{
nexto = old->next;
old->next = new;
new = old;
}
vpaths = new;
/* If there is a VPATH variable with a nonnull value, construct the
general VPATH list from it. We use variable_expand rather than just
calling lookup_variable so that it will be recursively expanded. */
{
/* Turn off --warn-undefined-variables while we expand SHELL and IFS. */
int save = warn_undefined_variables_flag;
warn_undefined_variables_flag = 0;
p = variable_expand ("$(strip $(VPATH))");
warn_undefined_variables_flag = save;
}
if (*p != '\0')
{
/* Save the list of vpaths. */
struct vpath *save_vpaths = vpaths;
/* Empty `vpaths' so the new one will have no next, and `vpaths'
will still be nil if P contains no existing directories. */
vpaths = 0;
/* Parse P. */
construct_vpath_list ("%", p);
/* Store the created path as the general path,
and restore the old list of vpaths. */
general_vpath = vpaths;
vpaths = save_vpaths;
}
/* If there is a GPATH variable with a nonnull value, construct the
GPATH list from it. We use variable_expand rather than just
calling lookup_variable so that it will be recursively expanded. */
{
/* Turn off --warn-undefined-variables while we expand SHELL and IFS. */
int save = warn_undefined_variables_flag;
warn_undefined_variables_flag = 0;
p = variable_expand ("$(strip $(GPATH))");
warn_undefined_variables_flag = save;
}
if (*p != '\0')
{
/* Save the list of vpaths. */
struct vpath *save_vpaths = vpaths;
/* Empty `vpaths' so the new one will have no next, and `vpaths'
will still be nil if P contains no existing directories. */
vpaths = 0;
/* Parse P. */
construct_vpath_list ("%", p);
/* Store the created path as the GPATH,
and restore the old list of vpaths. */
gpaths = vpaths;
vpaths = save_vpaths;
}
}
/* Construct the VPATH listing for the pattern and searchpath given.
This function is called to generate selective VPATH lists and also for
the general VPATH list (which is in fact just a selective VPATH that
is applied to everything). The returned pointer is either put in the
linked list of all selective VPATH lists or in the GENERAL_VPATH
variable.
If SEARCHPATH is nil, remove all previous listings with the same
pattern. If PATTERN is nil, remove all VPATH listings. Existing
and readable directories that are not "." given in the searchpath
separated by the path element separator (defined in make.h) are
loaded into the directory hash table if they are not there already
and put in the VPATH searchpath for the given pattern with trailing
slashes stripped off if present (and if the directory is not the
root, "/"). The length of the longest entry in the list is put in
the structure as well. The new entry will be at the head of the
VPATHS chain. */
void
construct_vpath_list (char *pattern, char *dirpath)
{
register unsigned int elem;
register char *p;
register char **vpath;
register unsigned int maxvpath;
unsigned int maxelem;
char *percent = NULL;
if (pattern != 0)
{
pattern = xstrdup (pattern);
percent = find_percent (pattern);
}
if (dirpath == 0)
{
/* Remove matching listings. */
register struct vpath *path, *lastpath;
lastpath = 0;
path = vpaths;
while (path != 0)
{
struct vpath *next = path->next;
if (pattern == 0
|| (((percent == 0 && path->percent == 0)
|| (percent - pattern == path->percent - path->pattern))
&& streq (pattern, path->pattern)))
{
/* Remove it from the linked list. */
if (lastpath == 0)
vpaths = path->next;
else
lastpath->next = next;
/* Free its unused storage. */
free (path->pattern);
free ((char *) path->searchpath);
free ((char *) path);
}
else
lastpath = path;
path = next;
}
if (pattern != 0)
free (pattern);
return;
}
#ifdef WINDOWS32
convert_vpath_to_windows32(dirpath, ';');
#endif
/* Figure out the maximum number of VPATH entries and put it in
MAXELEM. We start with 2, one before the first separator and one
nil (the list terminator) and increment our estimated number for
each separator or blank we find. */
maxelem = 2;
p = dirpath;
while (*p != '\0')
if (*p++ == PATH_SEPARATOR_CHAR || isblank ((unsigned char)*p))
++maxelem;
vpath = (char **) xmalloc (maxelem * sizeof (char *));
maxvpath = 0;
/* Skip over any initial separators and blanks. */
p = dirpath;
while (*p == PATH_SEPARATOR_CHAR || isblank ((unsigned char)*p))
++p;
elem = 0;
while (*p != '\0')
{
char *v;
unsigned int len;
/* Find the end of this entry. */
v = p;
while (*p != '\0' && *p != PATH_SEPARATOR_CHAR
&& !isblank ((unsigned char)*p))
++p;
len = p - v;
/* Make sure there's no trailing slash,
but still allow "/" as a directory. */
#if defined(__MSDOS__) || defined(__EMX__)
/* We need also to leave alone a trailing slash in "d:/". */
if (len > 3 || (len > 1 && v[1] != ':'))
#endif
if (len > 1 && p[-1] == '/')
--len;
if (len > 1 || *v != '.')
{
v = savestring (v, len);
/* Verify that the directory actually exists. */
if (dir_file_exists_p (v, ""))
{
/* It does. Put it in the list. */
vpath[elem++] = dir_name (v);
free (v);
if (len > maxvpath)
maxvpath = len;
}
else
/* The directory does not exist. Omit from the list. */
free (v);
}
/* Skip over separators and blanks between entries. */
while (*p == PATH_SEPARATOR_CHAR || isblank ((unsigned char)*p))
++p;
}
if (elem > 0)
{
struct vpath *path;
/* ELEM is now incremented one element past the last
entry, to where the nil-pointer terminator goes.
Usually this is maxelem - 1. If not, shrink down. */
if (elem < (maxelem - 1))
vpath = (char **) xrealloc ((char *) vpath,
(elem + 1) * sizeof (char *));
/* Put the nil-pointer terminator on the end of the VPATH list. */
vpath[elem] = 0;
/* Construct the vpath structure and put it into the linked list. */
path = (struct vpath *) xmalloc (sizeof (struct vpath));
path->searchpath = vpath;
path->maxlen = maxvpath;
path->next = vpaths;
vpaths = path;
/* Set up the members. */
path->pattern = pattern;
path->percent = percent;
path->patlen = strlen (pattern);
}
else
{
/* There were no entries, so free whatever space we allocated. */
free ((char *) vpath);
if (pattern != 0)
free (pattern);
}
}
/* Search the GPATH list for a pathname string that matches the one passed
in. If it is found, return 1. Otherwise we return 0. */
int
gpath_search (char *file, unsigned int len)
{
char **gp;
if (gpaths && (len <= gpaths->maxlen))
for (gp = gpaths->searchpath; *gp != NULL; ++gp)
if (strneq (*gp, file, len) && (*gp)[len] == '\0')
return 1;
return 0;
}
/* Search the VPATH list whose pattern matches *FILE for a directory
where the name pointed to by FILE exists. If it is found, we set *FILE to
the newly malloc'd name of the existing file, *MTIME_PTR (if MTIME_PTR is
not NULL) to its modtime (or zero if no stat call was done), and return 1.
Otherwise we return 0. */
int
vpath_search (char **file, FILE_TIMESTAMP *mtime_ptr)
{
register struct vpath *v;
/* If there are no VPATH entries or FILENAME starts at the root,
there is nothing we can do. */
if (**file == '/'
#ifdef HAVE_DOS_PATHS
|| **file == '\\'
|| (*file)[1] == ':'
#endif
|| (vpaths == 0 && general_vpath == 0))
return 0;
for (v = vpaths; v != 0; v = v->next)
if (pattern_matches (v->pattern, v->percent, *file))
if (selective_vpath_search (v, file, mtime_ptr))
return 1;
if (general_vpath != 0
&& selective_vpath_search (general_vpath, file, mtime_ptr))
return 1;
return 0;
}
/* Search the given VPATH list for a directory where the name pointed
to by FILE exists. If it is found, we set *FILE to the newly malloc'd
name of the existing file, *MTIME_PTR (if MTIME_PTR is not NULL) to
its modtime (or zero if no stat call was done), and we return 1.
Otherwise we return 0. */
static int
selective_vpath_search (struct vpath *path, char **file,
FILE_TIMESTAMP *mtime_ptr)
{
int not_target;
char *name, *n;
char *filename;
register char **vpath = path->searchpath;
unsigned int maxvpath = path->maxlen;
register unsigned int i;
unsigned int flen, vlen, name_dplen;
int exists = 0;
/* Find out if *FILE is a target.
If and only if it is NOT a target, we will accept prospective
files that don't exist but are mentioned in a makefile. */
{
struct file *f = lookup_file (*file);
not_target = f == 0 || !f->is_target;
}
flen = strlen (*file);
/* Split *FILE into a directory prefix and a name-within-directory.
NAME_DPLEN gets the length of the prefix; FILENAME gets the
pointer to the name-within-directory and FLEN is its length. */
n = strrchr (*file, '/');
#ifdef HAVE_DOS_PATHS
/* We need the rightmost slash or backslash. */
{
char *bslash = strrchr(*file, '\\');
if (!n || bslash > n)
n = bslash;
}
#endif
name_dplen = n != 0 ? n - *file : 0;
filename = name_dplen > 0 ? n + 1 : *file;
if (name_dplen > 0)
flen -= name_dplen + 1;
/* Allocate enough space for the biggest VPATH entry,
a slash, the directory prefix that came with *FILE,
another slash (although this one may not always be
necessary), the filename, and a null terminator. */
name = (char *) xmalloc (maxvpath + 1 + name_dplen + 1 + flen + 1);
/* Try each VPATH entry. */
for (i = 0; vpath[i] != 0; ++i)
{
int exists_in_cache = 0;
n = name;
/* Put the next VPATH entry into NAME at N and increment N past it. */
vlen = strlen (vpath[i]);
bcopy (vpath[i], n, vlen);
n += vlen;
/* Add the directory prefix already in *FILE. */
if (name_dplen > 0)
{
#ifndef VMS
*n++ = '/';
#endif
bcopy (*file, n, name_dplen);
n += name_dplen;
}
#ifdef HAVE_DOS_PATHS
/* Cause the next if to treat backslash and slash alike. */
if (n != name && n[-1] == '\\' )
n[-1] = '/';
#endif
/* Now add the name-within-directory at the end of NAME. */
#ifndef VMS
if (n != name && n[-1] != '/')
{
*n = '/';
bcopy (filename, n + 1, flen + 1);
}
else
#endif
bcopy (filename, n, flen + 1);
/* Check if the file is mentioned in a makefile. If *FILE is not
a target, that is enough for us to decide this file exists.
If *FILE is a target, then the file must be mentioned in the
makefile also as a target to be chosen.
The restriction that *FILE must not be a target for a
makefile-mentioned file to be chosen was added by an
inadequately commented change in July 1990; I am not sure off
hand what problem it fixes.
In December 1993 I loosened this restriction to allow a file
to be chosen if it is mentioned as a target in a makefile. This
seem logical.
Special handling for -W / -o: make sure we preserve the special
values here. Actually this whole thing is a little bogus: I think
we should ditch the name/hname thing and look into the renamed
capability that already exists for files: that is, have a new struct
file* entry for the VPATH-found file, and set the renamed field if
we use it.
*/
{
struct file *f = lookup_file (name);
if (f != 0)
{
exists = not_target || f->is_target;
if (exists && mtime_ptr
&& (f->last_mtime == OLD_MTIME || f->last_mtime == NEW_MTIME))
{
*mtime_ptr = f->last_mtime;
mtime_ptr = 0;
}
}
}
if (!exists)
{
/* That file wasn't mentioned in the makefile.
See if it actually exists. */
#ifdef VMS
exists_in_cache = exists = dir_file_exists_p (vpath[i], filename);
#else
/* Clobber a null into the name at the last slash.
Now NAME is the name of the directory to look in. */
*n = '\0';
/* We know the directory is in the hash table now because either
construct_vpath_list or the code just above put it there.
Does the file we seek exist in it? */
exists_in_cache = exists = dir_file_exists_p (name, filename);
#endif
}
if (exists)
{
/* The file is in the directory cache.
Now check that it actually exists in the filesystem.
The cache may be out of date. When vpath thinks a file
exists, but stat fails for it, confusion results in the
higher levels. */
struct stat st;
#ifndef VMS
/* Put the slash back in NAME. */
*n = '/';
#endif
if (exists_in_cache) /* Makefile-mentioned file need not exist. */
{
int e;
EINTRLOOP (e, stat (name, &st)); /* Does it really exist? */
if (e != 0)
{
exists = 0;
continue;
}
/* Store the modtime into *MTIME_PTR for the caller. */
if (mtime_ptr != 0)
{
*mtime_ptr = FILE_TIMESTAMP_STAT_MODTIME (name, st);
mtime_ptr = 0;
}
}
/* We have found a file.
Store the name we found into *FILE for the caller. */
*file = savestring (name, (n + 1 - name) + flen);
/* If we get here and mtime_ptr hasn't been set, record
UNKNOWN_MTIME to indicate this. */
if (mtime_ptr != 0)
*mtime_ptr = UNKNOWN_MTIME;
free (name);
return 1;
}
}
free (name);
return 0;
}
/* Print the data base of VPATH search paths. */
void
print_vpath_data_base (void)
{
register unsigned int nvpaths;
register struct vpath *v;
puts (_("\n# VPATH Search Paths\n"));
nvpaths = 0;
for (v = vpaths; v != 0; v = v->next)
{
register unsigned int i;
++nvpaths;
printf ("vpath %s ", v->pattern);
for (i = 0; v->searchpath[i] != 0; ++i)
printf ("%s%c", v->searchpath[i],
v->searchpath[i + 1] == 0 ? '\n' : PATH_SEPARATOR_CHAR);
}
if (vpaths == 0)
puts (_("# No `vpath' search paths."));
else
printf (_("\n# %u `vpath' search paths.\n"), nvpaths);
if (general_vpath == 0)
puts (_("\n# No general (`VPATH' variable) search path."));
else
{
register char **path = general_vpath->searchpath;
register unsigned int i;
fputs (_("\n# General (`VPATH' variable) search path:\n# "), stdout);
for (i = 0; path[i] != 0; ++i)
printf ("%s%c", path[i],
path[i + 1] == 0 ? '\n' : PATH_SEPARATOR_CHAR);
}
}