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freebsd/usr.bin/make/dir.c
Xin LI 512be259a7 Remove unnecessary includes. 
Reviewed by:	rodrigc
2009-12-11 23:20:02 +00:00

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/*-
* Copyright (c) 1988, 1989, 1990, 1993
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1988, 1989 by Adam de Boor
* Copyright (c) 1989 by Berkeley Softworks
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Adam de Boor.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)dir.c 8.2 (Berkeley) 1/2/94
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*-
* dir.c --
* Directory searching using wildcards and/or normal names...
* Used both for source wildcarding in the Makefile and for finding
* implicit sources.
*
* The interface for this module is:
* Dir_Init Initialize the module.
*
* Dir_HasWildcards Returns TRUE if the name given it needs to
* be wildcard-expanded.
*
* Path_Expand Given a pattern and a path, return a Lst of names
* which match the pattern on the search path.
*
* Path_FindFile Searches for a file on a given search path.
* If it exists, the entire path is returned.
* Otherwise NULL is returned.
*
* Dir_MTime Return the modification time of a node. The file
* is searched for along the default search path.
* The path and mtime fields of the node are filled in.
*
* Path_AddDir Add a directory to a search path.
*
* Dir_MakeFlags Given a search path and a command flag, create
* a string with each of the directories in the path
* preceded by the command flag and all of them
* separated by a space.
*
* Dir_Destroy Destroy an element of a search path. Frees up all
* things that can be freed for the element as long
* as the element is no longer referenced by any other
* search path.
*
* Dir_ClearPath Resets a search path to the empty list.
*
* For debugging:
* Dir_PrintDirectories Print stats about the directory cache.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "arch.h"
#include "dir.h"
#include "globals.h"
#include "GNode.h"
#include "hash.h"
#include "lst.h"
#include "str.h"
#include "targ.h"
#include "util.h"
/*
* A search path consists of a list of Dir structures. A Dir structure
* has in it the name of the directory and a hash table of all the files
* in the directory. This is used to cut down on the number of system
* calls necessary to find implicit dependents and their like. Since
* these searches are made before any actions are taken, we need not
* worry about the directory changing due to creation commands. If this
* hampers the style of some makefiles, they must be changed.
*
* A list of all previously-read directories is kept in the
* openDirectories list. This list is checked first before a directory
* is opened.
*
* The need for the caching of whole directories is brought about by
* the multi-level transformation code in suff.c, which tends to search
* for far more files than regular make does. In the initial
* implementation, the amount of time spent performing "stat" calls was
* truly astronomical. The problem with hashing at the start is,
* of course, that pmake doesn't then detect changes to these directories
* during the course of the make. Three possibilities suggest themselves:
*
* 1) just use stat to test for a file's existence. As mentioned
* above, this is very inefficient due to the number of checks
* engendered by the multi-level transformation code.
* 2) use readdir() and company to search the directories, keeping
* them open between checks. I have tried this and while it
* didn't slow down the process too much, it could severely
* affect the amount of parallelism available as each directory
* open would take another file descriptor out of play for
* handling I/O for another job. Given that it is only recently
* that UNIX OS's have taken to allowing more than 20 or 32
* file descriptors for a process, this doesn't seem acceptable
* to me.
* 3) record the mtime of the directory in the Dir structure and
* verify the directory hasn't changed since the contents were
* hashed. This will catch the creation or deletion of files,
* but not the updating of files. However, since it is the
* creation and deletion that is the problem, this could be
* a good thing to do. Unfortunately, if the directory (say ".")
* were fairly large and changed fairly frequently, the constant
* rehashing could seriously degrade performance. It might be
* good in such cases to keep track of the number of rehashes
* and if the number goes over a (small) limit, resort to using
* stat in its place.
*
* An additional thing to consider is that pmake is used primarily
* to create C programs and until recently pcc-based compilers refused
* to allow you to specify where the resulting object file should be
* placed. This forced all objects to be created in the current
* directory. This isn't meant as a full excuse, just an explanation of
* some of the reasons for the caching used here.
*
* One more note: the location of a target's file is only performed
* on the downward traversal of the graph and then only for terminal
* nodes in the graph. This could be construed as wrong in some cases,
* but prevents inadvertent modification of files when the "installed"
* directory for a file is provided in the search path.
*
* Another data structure maintained by this module is an mtime
* cache used when the searching of cached directories fails to find
* a file. In the past, Path_FindFile would simply perform an access()
* call in such a case to determine if the file could be found using
* just the name given. When this hit, however, all that was gained
* was the knowledge that the file existed. Given that an access() is
* essentially a stat() without the copyout() call, and that the same
* filesystem overhead would have to be incurred in Dir_MTime, it made
* sense to replace the access() with a stat() and record the mtime
* in a cache for when Dir_MTime was actually called.
*/
typedef struct Dir {
char *name; /* Name of directory */
int refCount; /* No. of paths with this directory */
int hits; /* No. of times a file has been found here */
Hash_Table files; /* Hash table of files in directory */
TAILQ_ENTRY(Dir) link; /* allDirs link */
} Dir;
/*
* A path is a list of pointers to directories. These directories are
* reference counted so a directory can be on more than one path.
*/
struct PathElement {
struct Dir *dir; /* pointer to the directory */
TAILQ_ENTRY(PathElement) link; /* path link */
};
/* main search path */
struct Path dirSearchPath = TAILQ_HEAD_INITIALIZER(dirSearchPath);
/* the list of all open directories */
static TAILQ_HEAD(, Dir) openDirectories =
TAILQ_HEAD_INITIALIZER(openDirectories);
/*
* Variables for gathering statistics on the efficiency of the hashing
* mechanism.
*/
static int hits; /* Found in directory cache */
static int misses; /* Sad, but not evil misses */
static int nearmisses; /* Found under search path */
static int bigmisses; /* Sought by itself */
static Dir *dot; /* contents of current directory */
/* Results of doing a last-resort stat in Path_FindFile --
* if we have to go to the system to find the file, we might as well
* have its mtime on record.
* XXX: If this is done way early, there's a chance other rules will
* have already updated the file, in which case we'll update it again.
* Generally, there won't be two rules to update a single file, so this
* should be ok, but...
*/
static Hash_Table mtimes;
/*-
*-----------------------------------------------------------------------
* Dir_Init --
* initialize things for this module
*
* Results:
* none
*
* Side Effects:
* none
*-----------------------------------------------------------------------
*/
void
Dir_Init(void)
{
Hash_InitTable(&mtimes, 0);
}
/*-
*-----------------------------------------------------------------------
* Dir_InitDot --
* initialize the "." directory
*
* Results:
* none
*
* Side Effects:
* some directories may be opened.
*-----------------------------------------------------------------------
*/
void
Dir_InitDot(void)
{
dot = Path_AddDir(NULL, ".");
if (dot == NULL)
err(1, "cannot open current directory");
/*
* We always need to have dot around, so we increment its
* reference count to make sure it's not destroyed.
*/
dot->refCount += 1;
}
/*-
*-----------------------------------------------------------------------
* Dir_HasWildcards --
* See if the given name has any wildcard characters in it.
*
* Results:
* returns TRUE if the word should be expanded, FALSE otherwise
*
* Side Effects:
* none
*-----------------------------------------------------------------------
*/
Boolean
Dir_HasWildcards(const char *name)
{
const char *cp;
int wild = 0, brace = 0, bracket = 0;
for (cp = name; *cp; cp++) {
switch (*cp) {
case '{':
brace++;
wild = 1;
break;
case '}':
brace--;
break;
case '[':
bracket++;
wild = 1;
break;
case ']':
bracket--;
break;
case '?':
case '*':
wild = 1;
break;
default:
break;
}
}
return (wild && bracket == 0 && brace == 0);
}
/*-
*-----------------------------------------------------------------------
* DirMatchFiles --
* Given a pattern and a Dir structure, see if any files
* match the pattern and add their names to the 'expansions' list if
* any do. This is incomplete -- it doesn't take care of patterns like
* src / *src / *.c properly (just *.c on any of the directories), but it
* will do for now.
*
* Results:
* Always returns 0
*
* Side Effects:
* File names are added to the expansions lst. The directory will be
* fully hashed when this is done.
*-----------------------------------------------------------------------
*/
static int
DirMatchFiles(const char *pattern, const Dir *p, Lst *expansions)
{
Hash_Search search; /* Index into the directory's table */
Hash_Entry *entry; /* Current entry in the table */
Boolean isDot; /* TRUE if the directory being searched is . */
isDot = (*p->name == '.' && p->name[1] == '\0');
for (entry = Hash_EnumFirst(&p->files, &search);
entry != NULL;
entry = Hash_EnumNext(&search)) {
/*
* See if the file matches the given pattern. Note we follow
* the UNIX convention that dot files will only be found if
* the pattern begins with a dot (note also that as a side
* effect of the hashing scheme, .* won't match . or ..
* since they aren't hashed).
*/
if (Str_Match(entry->name, pattern) &&
((entry->name[0] != '.') ||
(pattern[0] == '.'))) {
Lst_AtEnd(expansions, (isDot ? estrdup(entry->name) :
str_concat(p->name, entry->name, STR_ADDSLASH)));
}
}
return (0);
}
/*-
*-----------------------------------------------------------------------
* DirExpandCurly --
* Expand curly braces like the C shell. Does this recursively.
* Note the special case: if after the piece of the curly brace is
* done there are no wildcard characters in the result, the result is
* placed on the list WITHOUT CHECKING FOR ITS EXISTENCE. The
* given arguments are the entire word to expand, the first curly
* brace in the word, the search path, and the list to store the
* expansions in.
*
* Results:
* None.
*
* Side Effects:
* The given list is filled with the expansions...
*
*-----------------------------------------------------------------------
*/
static void
DirExpandCurly(const char *word, const char *brace, struct Path *path,
Lst *expansions)
{
const char *end; /* Character after the closing brace */
const char *cp; /* Current position in brace clause */
const char *start; /* Start of current piece of brace clause */
int bracelevel; /* Number of braces we've seen. If we see a right brace
* when this is 0, we've hit the end of the clause. */
char *file; /* Current expansion */
int otherLen; /* The length of the other pieces of the expansion
* (chars before and after the clause in 'word') */
char *cp2; /* Pointer for checking for wildcards in
* expansion before calling Dir_Expand */
start = brace + 1;
/*
* Find the end of the brace clause first, being wary of nested brace
* clauses.
*/
for (end = start, bracelevel = 0; *end != '\0'; end++) {
if (*end == '{')
bracelevel++;
else if ((*end == '}') && (bracelevel-- == 0))
break;
}
if (*end == '\0') {
Error("Unterminated {} clause \"%s\"", start);
return;
} else
end++;
otherLen = brace - word + strlen(end);
for (cp = start; cp < end; cp++) {
/*
* Find the end of this piece of the clause.
*/
bracelevel = 0;
while (*cp != ',') {
if (*cp == '{')
bracelevel++;
else if ((*cp == '}') && (bracelevel-- <= 0))
break;
cp++;
}
/*
* Allocate room for the combination and install the
* three pieces.
*/
file = emalloc(otherLen + cp - start + 1);
if (brace != word)
strncpy(file, word, brace - word);
if (cp != start)
strncpy(&file[brace - word], start, cp - start);
strcpy(&file[(brace - word) + (cp - start)], end);
/*
* See if the result has any wildcards in it. If we find one,
* call Dir_Expand right away, telling it to place the result
* on our list of expansions.
*/
for (cp2 = file; *cp2 != '\0'; cp2++) {
switch (*cp2) {
case '*':
case '?':
case '{':
case '[':
Path_Expand(file, path, expansions);
goto next;
default:
break;
}
}
if (*cp2 == '\0') {
/*
* Hit the end w/o finding any wildcards, so stick
* the expansion on the end of the list.
*/
Lst_AtEnd(expansions, file);
} else {
next:
free(file);
}
start = cp + 1;
}
}
/*-
*-----------------------------------------------------------------------
* DirExpandInt --
* Internal expand routine. Passes through the directories in the
* path one by one, calling DirMatchFiles for each. NOTE: This still
* doesn't handle patterns in directories... Works given a word to
* expand, a path to look in, and a list to store expansions in.
*
* Results:
* None.
*
* Side Effects:
* Things are added to the expansions list.
*
*-----------------------------------------------------------------------
*/
static void
DirExpandInt(const char *word, const struct Path *path, Lst *expansions)
{
struct PathElement *pe;
TAILQ_FOREACH(pe, path, link)
DirMatchFiles(word, pe->dir, expansions);
}
/*-
*-----------------------------------------------------------------------
* Dir_Expand --
* Expand the given word into a list of words by globbing it looking
* in the directories on the given search path.
*
* Results:
* A list of words consisting of the files which exist along the search
* path matching the given pattern is placed in expansions.
*
* Side Effects:
* Directories may be opened. Who knows?
*-----------------------------------------------------------------------
*/
void
Path_Expand(char *word, struct Path *path, Lst *expansions)
{
LstNode *ln;
char *cp;
DEBUGF(DIR, ("expanding \"%s\"...", word));
cp = strchr(word, '{');
if (cp != NULL)
DirExpandCurly(word, cp, path, expansions);
else {
cp = strchr(word, '/');
if (cp != NULL) {
/*
* The thing has a directory component -- find the
* first wildcard in the string.
*/
for (cp = word; *cp != '\0'; cp++) {
if (*cp == '?' || *cp == '[' ||
*cp == '*' || *cp == '{') {
break;
}
}
if (*cp == '{') {
/*
* This one will be fun.
*/
DirExpandCurly(word, cp, path, expansions);
return;
} else if (*cp != '\0') {
/*
* Back up to the start of the component
*/
char *dirpath;
while (cp > word && *cp != '/')
cp--;
if (cp != word) {
char sc;
/*
* If the glob isn't in the first
* component, try and find all the
* components up to the one with a
* wildcard.
*/
sc = cp[1];
cp[1] = '\0';
dirpath = Path_FindFile(word, path);
cp[1] = sc;
/*
* dirpath is null if can't find the
* leading component
* XXX: Path_FindFile won't find internal
* components. i.e. if the path contains
* ../Etc/Object and we're looking for
* Etc, * it won't be found. Ah well.
* Probably not important.
*/
if (dirpath != NULL) {
char *dp =
&dirpath[strlen(dirpath)
- 1];
struct Path tp =
TAILQ_HEAD_INITIALIZER(tp);
if (*dp == '/')
*dp = '\0';
Path_AddDir(&tp, dirpath);
DirExpandInt(cp + 1, &tp,
expansions);
Path_Clear(&tp);
}
} else {
/*
* Start the search from the local
* directory
*/
DirExpandInt(word, path, expansions);
}
} else {
/*
* Return the file -- this should never happen.
*/
DirExpandInt(word, path, expansions);
}
} else {
/*
* First the files in dot
*/
DirMatchFiles(word, dot, expansions);
/*
* Then the files in every other directory on the path.
*/
DirExpandInt(word, path, expansions);
}
}
if (DEBUG(DIR)) {
LST_FOREACH(ln, expansions)
DEBUGF(DIR, ("%s ", (const char *)Lst_Datum(ln)));
DEBUGF(DIR, ("\n"));
}
}
/**
* Path_FindFile
* Find the file with the given name along the given search path.
*
* Results:
* The path to the file or NULL. This path is guaranteed to be in a
* different part of memory than name and so may be safely free'd.
*
* Side Effects:
* If the file is found in a directory which is not on the path
* already (either 'name' is absolute or it is a relative path
* [ dir1/.../dirn/file ] which exists below one of the directories
* already on the search path), its directory is added to the end
* of the path on the assumption that there will be more files in
* that directory later on. Sometimes this is true. Sometimes not.
*/
char *
Path_FindFile(char *name, struct Path *path)
{
char *p1; /* pointer into p->name */
char *p2; /* pointer into name */
char *file; /* the current filename to check */
const struct PathElement *pe; /* current path member */
char *cp; /* final component of the name */
Boolean hasSlash; /* true if 'name' contains a / */
struct stat stb; /* Buffer for stat, if necessary */
Hash_Entry *entry; /* Entry for mtimes table */
/*
* Find the final component of the name and note whether it has a
* slash in it (the name, I mean)
*/
cp = strrchr(name, '/');
if (cp != NULL) {
hasSlash = TRUE;
cp += 1;
} else {
hasSlash = FALSE;
cp = name;
}
DEBUGF(DIR, ("Searching for %s...", name));
/*
* No matter what, we always look for the file in the current directory
* before anywhere else and we *do not* add the ./ to it if it exists.
* This is so there are no conflicts between what the user specifies
* (fish.c) and what pmake finds (./fish.c).
*/
if ((!hasSlash || (cp - name == 2 && *name == '.')) &&
(Hash_FindEntry(&dot->files, cp) != NULL)) {
DEBUGF(DIR, ("in '.'\n"));
hits += 1;
dot->hits += 1;
return (estrdup(name));
}
/*
* We look through all the directories on the path seeking one which
* contains the final component of the given name and whose final
* component(s) match the name's initial component(s). If such a beast
* is found, we concatenate the directory name and the final component
* and return the resulting string. If we don't find any such thing,
* we go on to phase two...
*/
TAILQ_FOREACH(pe, path, link) {
DEBUGF(DIR, ("%s...", pe->dir->name));
if (Hash_FindEntry(&pe->dir->files, cp) != NULL) {
DEBUGF(DIR, ("here..."));
if (hasSlash) {
/*
* If the name had a slash, its initial
* components and p's final components must
* match. This is false if a mismatch is
* encountered before all of the initial
* components have been checked (p2 > name at
* the end of the loop), or we matched only
* part of one of the components of p
* along with all the rest of them (*p1 != '/').
*/
p1 = pe->dir->name + strlen(pe->dir->name) - 1;
p2 = cp - 2;
while (p2 >= name && p1 >= pe->dir->name &&
*p1 == *p2) {
p1 -= 1; p2 -= 1;
}
if (p2 >= name || (p1 >= pe->dir->name &&
*p1 != '/')) {
DEBUGF(DIR, ("component mismatch -- "
"continuing..."));
continue;
}
}
file = str_concat(pe->dir->name, cp, STR_ADDSLASH);
DEBUGF(DIR, ("returning %s\n", file));
pe->dir->hits += 1;
hits += 1;
return (file);
} else if (hasSlash) {
/*
* If the file has a leading path component and that
* component exactly matches the entire name of the
* current search directory, we assume the file
* doesn't exist and return NULL.
*/
for (p1 = pe->dir->name, p2 = name; *p1 && *p1 == *p2;
p1++, p2++)
continue;
if (*p1 == '\0' && p2 == cp - 1) {
if (*cp == '\0' || ISDOT(cp) || ISDOTDOT(cp)) {
DEBUGF(DIR, ("returning %s\n", name));
return (estrdup(name));
} else {
DEBUGF(DIR, ("must be here but isn't --"
" returning NULL\n"));
return (NULL);
}
}
}
}
/*
* We didn't find the file on any existing members of the directory.
* If the name doesn't contain a slash, that means it doesn't exist.
* If it *does* contain a slash, however, there is still hope: it
* could be in a subdirectory of one of the members of the search
* path. (eg. /usr/include and sys/types.h. The above search would
* fail to turn up types.h in /usr/include, but it *is* in
* /usr/include/sys/types.h) If we find such a beast, we assume there
* will be more (what else can we assume?) and add all but the last
* component of the resulting name onto the search path (at the
* end). This phase is only performed if the file is *not* absolute.
*/
if (!hasSlash) {
DEBUGF(DIR, ("failed.\n"));
misses += 1;
return (NULL);
}
if (*name != '/') {
Boolean checkedDot = FALSE;
DEBUGF(DIR, ("failed. Trying subdirectories..."));
TAILQ_FOREACH(pe, path, link) {
if (pe->dir != dot) {
file = str_concat(pe->dir->name,
name, STR_ADDSLASH);
} else {
/*
* Checking in dot -- DON'T put a leading ./
* on the thing.
*/
file = estrdup(name);
checkedDot = TRUE;
}
DEBUGF(DIR, ("checking %s...", file));
if (stat(file, &stb) == 0) {
DEBUGF(DIR, ("got it.\n"));
/*
* We've found another directory to search. We
* know there's a slash in 'file' because we put
* one there. We nuke it after finding it and
* call Path_AddDir to add this new directory
* onto the existing search path. Once that's
* done, we restore the slash and triumphantly
* return the file name, knowing that should a
* file in this directory every be referenced
* again in such a manner, we will find it
* without having to do numerous numbers of
* access calls. Hurrah!
*/
cp = strrchr(file, '/');
*cp = '\0';
Path_AddDir(path, file);
*cp = '/';
/*
* Save the modification time so if
* it's needed, we don't have to fetch it again.
*/
DEBUGF(DIR, ("Caching %s for %s\n",
Targ_FmtTime(stb.st_mtime), file));
entry = Hash_CreateEntry(&mtimes, file,
(Boolean *)NULL);
Hash_SetValue(entry,
(void *)(long)stb.st_mtime);
nearmisses += 1;
return (file);
} else {
free(file);
}
}
DEBUGF(DIR, ("failed. "));
if (checkedDot) {
/*
* Already checked by the given name, since . was in
* the path, so no point in proceeding...
*/
DEBUGF(DIR, ("Checked . already, returning NULL\n"));
return (NULL);
}
}
/*
* Didn't find it that way, either. Sigh. Phase 3. Add its directory
* onto the search path in any case, just in case, then look for the
* thing in the hash table. If we find it, grand. We return a new
* copy of the name. Otherwise we sadly return a NULL pointer. Sigh.
* Note that if the directory holding the file doesn't exist, this will
* do an extra search of the final directory on the path. Unless
* something weird happens, this search won't succeed and life will
* be groovy.
*
* Sigh. We cannot add the directory onto the search path because
* of this amusing case:
* $(INSTALLDIR)/$(FILE): $(FILE)
*
* $(FILE) exists in $(INSTALLDIR) but not in the current one.
* When searching for $(FILE), we will find it in $(INSTALLDIR)
* b/c we added it here. This is not good...
*/
DEBUGF(DIR, ("Looking for \"%s\"...", name));
bigmisses += 1;
entry = Hash_FindEntry(&mtimes, name);
if (entry != NULL) {
DEBUGF(DIR, ("got it (in mtime cache)\n"));
return (estrdup(name));
} else if (stat (name, &stb) == 0) {
entry = Hash_CreateEntry(&mtimes, name, (Boolean *)NULL);
DEBUGF(DIR, ("Caching %s for %s\n",
Targ_FmtTime(stb.st_mtime), name));
Hash_SetValue(entry, (void *)(long)stb.st_mtime);
return (estrdup(name));
} else {
DEBUGF(DIR, ("failed. Returning NULL\n"));
return (NULL);
}
}
/*-
*-----------------------------------------------------------------------
* Dir_MTime --
* Find the modification time of the file described by gn along the
* search path dirSearchPath.
*
* Results:
* The modification time or 0 if it doesn't exist
*
* Side Effects:
* The modification time is placed in the node's mtime slot.
* If the node didn't have a path entry before, and Path_FindFile
* found one for it, the full name is placed in the path slot.
*-----------------------------------------------------------------------
*/
int
Dir_MTime(GNode *gn)
{
char *fullName; /* the full pathname of name */
struct stat stb; /* buffer for finding the mod time */
Hash_Entry *entry;
if (gn->type & OP_ARCHV)
return (Arch_MTime(gn));
else if (gn->path == NULL)
fullName = Path_FindFile(gn->name, &dirSearchPath);
else
fullName = gn->path;
if (fullName == NULL)
fullName = estrdup(gn->name);
entry = Hash_FindEntry(&mtimes, fullName);
if (entry != NULL) {
/*
* Only do this once -- the second time folks are checking to
* see if the file was actually updated, so we need to
* actually go to the filesystem.
*/
DEBUGF(DIR, ("Using cached time %s for %s\n",
Targ_FmtTime((time_t)(long)Hash_GetValue(entry)),
fullName));
stb.st_mtime = (time_t)(long)Hash_GetValue(entry);
Hash_DeleteEntry(&mtimes, entry);
} else if (stat(fullName, &stb) < 0) {
if (gn->type & OP_MEMBER) {
if (fullName != gn->path)
free(fullName);
return (Arch_MemMTime(gn));
} else {
stb.st_mtime = 0;
}
}
if (fullName && gn->path == (char *)NULL)
gn->path = fullName;
gn->mtime = stb.st_mtime;
return (gn->mtime);
}
/*-
*-----------------------------------------------------------------------
* Path_AddDir --
* Add the given name to the end of the given path.
*
* Results:
* none
*
* Side Effects:
* A structure is added to the list and the directory is
* read and hashed.
*-----------------------------------------------------------------------
*/
struct Dir *
Path_AddDir(struct Path *path, const char *name)
{
Dir *d; /* pointer to new Path structure */
DIR *dir; /* for reading directory */
struct PathElement *pe;
struct dirent *dp; /* entry in directory */
/* check whether we know this directory */
TAILQ_FOREACH(d, &openDirectories, link) {
if (strcmp(d->name, name) == 0) {
/* Found it. */
if (path == NULL)
return (d);
/* Check whether its already on the path. */
TAILQ_FOREACH(pe, path, link) {
if (pe->dir == d)
return (d);
}
/* Add it to the path */
d->refCount += 1;
pe = emalloc(sizeof(*pe));
pe->dir = d;
TAILQ_INSERT_TAIL(path, pe, link);
return (d);
}
}
DEBUGF(DIR, ("Caching %s...", name));
if ((dir = opendir(name)) == NULL) {
DEBUGF(DIR, (" cannot open\n"));
return (NULL);
}
d = emalloc(sizeof(*d));
d->name = estrdup(name);
d->hits = 0;
d->refCount = 1;
Hash_InitTable(&d->files, -1);
while ((dp = readdir(dir)) != NULL) {
#if defined(sun) && defined(d_ino) /* d_ino is a sunos4 #define for d_fileno */
/*
* The sun directory library doesn't check for
* a 0 inode (0-inode slots just take up space),
* so we have to do it ourselves.
*/
if (dp->d_fileno == 0)
continue;
#endif /* sun && d_ino */
/* Skip the '.' and '..' entries by checking
* for them specifically instead of assuming
* readdir() reuturns them in that order when
* first going through a directory. This is
* needed for XFS over NFS filesystems since
* SGI does not guarantee that these are the
* first two entries returned from readdir().
*/
if (ISDOT(dp->d_name) || ISDOTDOT(dp->d_name))
continue;
Hash_CreateEntry(&d->files, dp->d_name, (Boolean *)NULL);
}
closedir(dir);
if (path != NULL) {
/* Add it to the path */
d->refCount += 1;
pe = emalloc(sizeof(*pe));
pe->dir = d;
TAILQ_INSERT_TAIL(path, pe, link);
}
/* Add to list of all directories */
TAILQ_INSERT_TAIL(&openDirectories, d, link);
DEBUGF(DIR, ("done\n"));
return (d);
}
/**
* Path_Duplicate
* Duplicate a path. Ups the reference count for the directories.
*/
void
Path_Duplicate(struct Path *dst, const struct Path *src)
{
struct PathElement *ped, *pes;
TAILQ_FOREACH(pes, src, link) {
ped = emalloc(sizeof(*ped));
ped->dir = pes->dir;
ped->dir->refCount++;
TAILQ_INSERT_TAIL(dst, ped, link);
}
}
/**
* Path_MakeFlags
* Make a string by taking all the directories in the given search
* path and preceding them by the given flag. Used by the suffix
* module to create variables for compilers based on suffix search
* paths.
*
* Results:
* The string mentioned above. Note that there is no space between
* the given flag and each directory. The empty string is returned if
* Things don't go well.
*/
char *
Path_MakeFlags(const char *flag, const struct Path *path)
{
char *str; /* the string which will be returned */
char *tstr; /* the current directory preceded by 'flag' */
char *nstr;
const struct PathElement *pe;
str = estrdup("");
TAILQ_FOREACH(pe, path, link) {
tstr = str_concat(flag, pe->dir->name, 0);
nstr = str_concat(str, tstr, STR_ADDSPACE);
free(str);
free(tstr);
str = nstr;
}
return (str);
}
/**
* Path_Clear
*
* Destroy a path. This decrements the reference counts of all
* directories of this path and, if a reference count goes 0,
* destroys the directory object.
*/
void
Path_Clear(struct Path *path)
{
struct PathElement *pe;
while ((pe = TAILQ_FIRST(path)) != NULL) {
pe->dir->refCount--;
TAILQ_REMOVE(path, pe, link);
if (pe->dir->refCount == 0) {
TAILQ_REMOVE(&openDirectories, pe->dir, link);
Hash_DeleteTable(&pe->dir->files);
free(pe->dir->name);
free(pe->dir);
}
free(pe);
}
}
/**
* Path_Concat
*
* Concatenate two paths, adding the second to the end of the first.
* Make sure to avoid duplicates.
*
* Side Effects:
* Reference counts for added dirs are upped.
*/
void
Path_Concat(struct Path *path1, const struct Path *path2)
{
struct PathElement *p1, *p2;
TAILQ_FOREACH(p2, path2, link) {
TAILQ_FOREACH(p1, path1, link) {
if (p1->dir == p2->dir)
break;
}
if (p1 == NULL) {
p1 = emalloc(sizeof(*p1));
p1->dir = p2->dir;
p1->dir->refCount++;
TAILQ_INSERT_TAIL(path1, p1, link);
}
}
}
/********** DEBUG INFO **********/
void
Dir_PrintDirectories(void)
{
const Dir *d;
printf("#*** Directory Cache:\n");
printf("# Stats: %d hits %d misses %d near misses %d losers (%d%%)\n",
hits, misses, nearmisses, bigmisses,
(hits + bigmisses + nearmisses ?
hits * 100 / (hits + bigmisses + nearmisses) : 0));
printf("# %-20s referenced\thits\n", "directory");
TAILQ_FOREACH(d, &openDirectories, link)
printf("# %-20s %10d\t%4d\n", d->name, d->refCount, d->hits);
}
void
Path_Print(const struct Path *path)
{
const struct PathElement *p;
TAILQ_FOREACH(p, path, link)
printf("%s ", p->dir->name);
}
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