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freebsd/usr.bin/make/dir.c
Juli Mallett 30617de0f3 Remove a stray asterisk in a comment.
2002-06-01 00:52:28 +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_End Cleanup the module.
*
* Dir_HasWildcards Returns TRUE if the name given it needs to
* be wildcard-expanded.
*
* Dir_Expand Given a pattern and a path, return a Lst of names
* which match the pattern on the search path.
*
* Dir_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.
*
* Dir_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 <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <err.h>
#include "make.h"
#include "hash.h"
#include "dir.h"
/*
* A search path consists of a Lst of Path structures. A Path 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 Lst. 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 Path 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, Dir_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.
*/
Lst dirSearchPath; /* main search path */
static Lst openDirectories; /* the list of all open directories */
/*
* Variables for gathering statistics on the efficiency of the hashing
* mechanism.
*/
static int hits, /* Found in directory cache */
misses, /* Sad, but not evil misses */
nearmisses, /* Found under search path */
bigmisses; /* Sought by itself */
static Path *dot; /* contents of current directory */
static Hash_Table mtimes; /* Results of doing a last-resort stat in
* Dir_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 int DirFindName(void *, void *);
static int DirMatchFiles(char *, Path *, Lst);
static void DirExpandCurly(char *, char *, Lst, Lst);
static void DirExpandInt(char *, Lst, Lst);
static int DirPrintWord(void *, void *);
static int DirPrintDir(void *, void *);
/*-
*-----------------------------------------------------------------------
* Dir_Init --
* initialize things for this module
*
* Results:
* none
*
* Side Effects:
* some directories may be opened.
*-----------------------------------------------------------------------
*/
void
Dir_Init ()
{
dirSearchPath = Lst_Init (FALSE);
openDirectories = Lst_Init (FALSE);
Hash_InitTable(&mtimes, 0);
/*
* Since the Path structure is placed on both openDirectories and
* the path we give Dir_AddDir (which in this case is openDirectories),
* we need to remove "." from openDirectories and what better time to
* do it than when we have to fetch the thing anyway?
*/
Dir_AddDir (openDirectories, ".");
dot = (Path *) Lst_DeQueue (openDirectories);
if (dot == (Path *) 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_End --
* cleanup things for this module
*
* Results:
* none
*
* Side Effects:
* none
*-----------------------------------------------------------------------
*/
void
Dir_End()
{
dot->refCount -= 1;
Dir_Destroy((void *) dot);
Dir_ClearPath(dirSearchPath);
Lst_Destroy(dirSearchPath, NOFREE);
Dir_ClearPath(openDirectories);
Lst_Destroy(openDirectories, NOFREE);
Hash_DeleteTable(&mtimes);
}
/*-
*-----------------------------------------------------------------------
* DirFindName --
* See if the Path structure describes the same directory as the
* given one by comparing their names. Called from Dir_AddDir via
* Lst_Find when searching the list of open directories.
*
* Results:
* 0 if it is the same. Non-zero otherwise
*
* Side Effects:
* None
*-----------------------------------------------------------------------
*/
static int
DirFindName (p, dname)
void * p; /* Current name */
void * dname; /* Desired name */
{
return (strcmp (((Path *)p)->name, (char *) dname));
}
/*-
*-----------------------------------------------------------------------
* 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 (name)
char *name; /* name to check */
{
char *cp;
for (cp = name; *cp; cp++) {
switch(*cp) {
case '{':
case '[':
case '?':
case '*':
return (TRUE);
}
}
return (FALSE);
}
/*-
*-----------------------------------------------------------------------
* DirMatchFiles --
* Given a pattern and a Path 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 (pattern, p, expansions)
char *pattern; /* Pattern to look for */
Path *p; /* Directory to search */
Lst expansions; /* Place to store the results */
{
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 != (Hash_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] == '.')))
{
(void)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.
*
* Results:
* None.
*
* Side Effects:
* The given list is filled with the expansions...
*
*-----------------------------------------------------------------------
*/
static void
DirExpandCurly(word, brace, path, expansions)
char *word; /* Entire word to expand */
char *brace; /* First curly brace in it */
Lst path; /* Search path to use */
Lst expansions; /* Place to store the expansions */
{
char *end; /* Character after the closing brace */
char *cp; /* Current position in brace clause */
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 '[':
Dir_Expand(file, path, expansions);
goto next;
}
}
if (*cp2 == '\0') {
/*
* Hit the end w/o finding any wildcards, so stick the expansion
* on the end of the list.
*/
(void)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...
*
* Results:
* None.
*
* Side Effects:
* Things are added to the expansions list.
*
*-----------------------------------------------------------------------
*/
static void
DirExpandInt(word, path, expansions)
char *word; /* Word to expand */
Lst path; /* Path on which to look */
Lst expansions; /* Place to store the result */
{
LstNode ln; /* Current node */
Path *p; /* Directory in the node */
if (Lst_Open(path) == SUCCESS) {
while ((ln = Lst_Next(path)) != NULL) {
p = (Path *)Lst_Datum(ln);
DirMatchFiles(word, p, expansions);
}
Lst_Close(path);
}
}
/*-
*-----------------------------------------------------------------------
* DirPrintWord --
* Print a word in the list of expansions. Callback for Dir_Expand
* when DEBUG(DIR), via Lst_ForEach.
*
* Results:
* === 0
*
* Side Effects:
* The passed word is printed, followed by a space.
*
*-----------------------------------------------------------------------
*/
static int
DirPrintWord(word, dummy)
void * word;
void * dummy;
{
printf("%s ", (char *) word);
return(dummy ? 0 : 0);
}
/*-
*-----------------------------------------------------------------------
* 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.
*
* Side Effects:
* Directories may be opened. Who knows?
*-----------------------------------------------------------------------
*/
void
Dir_Expand (word, path, expansions)
char *word; /* the word to expand */
Lst path; /* the list of directories in which to find
* the resulting files */
Lst expansions; /* the list on which to place the results */
{
char *cp;
if (DEBUG(DIR)) {
printf("expanding \"%s\"...", word);
}
cp = strchr(word, '{');
if (cp) {
DirExpandCurly(word, cp, path, expansions);
} else {
cp = strchr(word, '/');
if (cp) {
/*
* The thing has a directory component -- find the first wildcard
* in the string.
*/
for (cp = word; *cp; 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 = Dir_FindFile(word, path);
cp[1] = sc;
/*
* dirpath is null if can't find the leading component
* XXX: Dir_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 != (char *)NULL) {
char *dp = &dirpath[strlen(dirpath) - 1];
if (*dp == '/')
*dp = '\0';
path = Lst_Init(FALSE);
Dir_AddDir(path, dirpath);
DirExpandInt(cp+1, path, expansions);
Lst_Destroy(path, NOFREE);
}
} 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(expansions, DirPrintWord, (void *) 0);
fputc('\n', stdout);
}
}
/*-
*-----------------------------------------------------------------------
* Dir_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 *
Dir_FindFile (name, path)
char *name; /* the file to find */
Lst path; /* the Lst of directories to search */
{
char *p1; /* pointer into p->name */
char *p2; /* pointer into name */
LstNode ln; /* a list element */
char *file; /* the current filename to check */
Path *p; /* current path member */
char *cp; /* index of first slash, if any */
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) {
hasSlash = TRUE;
cp += 1;
} else {
hasSlash = FALSE;
cp = name;
}
if (DEBUG(DIR)) {
printf("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) != (Hash_Entry *)NULL)) {
if (DEBUG(DIR)) {
printf("in '.'\n");
}
hits += 1;
dot->hits += 1;
return (estrdup (name));
}
if (Lst_Open (path) == FAILURE) {
if (DEBUG(DIR)) {
printf("couldn't open path, file not found\n");
}
misses += 1;
return ((char *) NULL);
}
/*
* 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...
*/
while ((ln = Lst_Next (path)) != NULL) {
p = (Path *) Lst_Datum (ln);
if (DEBUG(DIR)) {
printf("%s...", p->name);
}
if (Hash_FindEntry (&p->files, cp) != (Hash_Entry *)NULL) {
if (DEBUG(DIR)) {
printf("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 = p->name + strlen (p->name) - 1;
p2 = cp - 2;
while (p2 >= name && p1 >= p->name && *p1 == *p2) {
p1 -= 1; p2 -= 1;
}
if (p2 >= name || (p1 >= p->name && *p1 != '/')) {
if (DEBUG(DIR)) {
printf("component mismatch -- continuing...");
}
continue;
}
}
file = str_concat (p->name, cp, STR_ADDSLASH);
if (DEBUG(DIR)) {
printf("returning %s\n", file);
}
Lst_Close (path);
p->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 = p->name, p2 = name; *p1 && *p1 == *p2; p1++, p2++) {
continue;
}
if (*p1 == '\0' && p2 == cp - 1) {
if (DEBUG(DIR)) {
printf("must be here but isn't -- returing NULL\n");
}
Lst_Close (path);
return ((char *) 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) {
if (DEBUG(DIR)) {
printf("failed.\n");
}
misses += 1;
return ((char *) NULL);
}
if (*name != '/') {
Boolean checkedDot = FALSE;
if (DEBUG(DIR)) {
printf("failed. Trying subdirectories...");
}
(void) Lst_Open (path);
while ((ln = Lst_Next (path)) != NULL) {
p = (Path *) Lst_Datum (ln);
if (p != dot) {
file = str_concat (p->name, name, STR_ADDSLASH);
} else {
/*
* Checking in dot -- DON'T put a leading ./ on the thing.
*/
file = estrdup(name);
checkedDot = TRUE;
}
if (DEBUG(DIR)) {
printf("checking %s...", file);
}
if (stat (file, &stb) == 0) {
if (DEBUG(DIR)) {
printf("got it.\n");
}
Lst_Close (path);
/*
* 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 Dir_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';
Dir_AddDir (path, file);
*cp = '/';
/*
* Save the modification time so if it's needed, we don't have
* to fetch it again.
*/
if (DEBUG(DIR)) {
printf("Caching %s for %s\n", Targ_FmtTime(stb.st_mtime),
file);
}
entry = Hash_CreateEntry(&mtimes, (char *) file,
(Boolean *)NULL);
Hash_SetValue(entry, (long)stb.st_mtime);
nearmisses += 1;
return (file);
} else {
free (file);
}
}
if (DEBUG(DIR)) {
printf("failed. ");
}
Lst_Close (path);
if (checkedDot) {
/*
* Already checked by the given name, since . was in the path,
* so no point in proceeding...
*/
if (DEBUG(DIR)) {
printf("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...
*/
#ifdef notdef
cp[-1] = '\0';
Dir_AddDir (path, name);
cp[-1] = '/';
bigmisses += 1;
ln = Lst_Last (path);
if (ln == NULL) {
return ((char *) NULL);
} else {
p = (Path *) Lst_Datum (ln);
}
if (Hash_FindEntry (&p->files, cp) != (Hash_Entry *)NULL) {
return (estrdup (name));
} else {
return ((char *) NULL);
}
#else /* !notdef */
if (DEBUG(DIR)) {
printf("Looking for \"%s\"...", name);
}
bigmisses += 1;
entry = Hash_FindEntry(&mtimes, name);
if (entry != (Hash_Entry *)NULL) {
if (DEBUG(DIR)) {
printf("got it (in mtime cache)\n");
}
return(estrdup(name));
} else if (stat (name, &stb) == 0) {
entry = Hash_CreateEntry(&mtimes, name, (Boolean *)NULL);
if (DEBUG(DIR)) {
printf("Caching %s for %s\n", Targ_FmtTime(stb.st_mtime),
name);
}
Hash_SetValue(entry, (long)stb.st_mtime);
return (estrdup (name));
} else {
if (DEBUG(DIR)) {
printf("failed. Returning NULL\n");
}
return ((char *)NULL);
}
#endif /* notdef */
}
/*-
*-----------------------------------------------------------------------
* 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 Dir_FindFile
* found one for it, the full name is placed in the path slot.
*-----------------------------------------------------------------------
*/
int
Dir_MTime (gn)
GNode *gn; /* the file whose modification time is
* desired */
{
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 == (char *)NULL) {
fullName = Dir_FindFile (gn->name, dirSearchPath);
} else {
fullName = gn->path;
}
if (fullName == (char *)NULL) {
fullName = estrdup(gn->name);
}
entry = Hash_FindEntry(&mtimes, fullName);
if (entry != (Hash_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.
*/
if (DEBUG(DIR)) {
printf("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);
}
/*-
*-----------------------------------------------------------------------
* Dir_AddDir --
* Add the given name to the end of the given path. The order of
* the arguments is backwards so ParseDoDependency can do a
* Lst_ForEach of its list of paths...
*
* Results:
* none
*
* Side Effects:
* A structure is added to the list and the directory is
* read and hashed.
*-----------------------------------------------------------------------
*/
void
Dir_AddDir (path, name)
Lst path; /* the path to which the directory should be
* added */
char *name; /* the name of the directory to add */
{
LstNode ln; /* node in case Path structure is found */
Path *p; /* pointer to new Path structure */
DIR *d; /* for reading directory */
struct dirent *dp; /* entry in directory */
ln = Lst_Find (openDirectories, (void *)name, DirFindName);
if (ln != NULL) {
p = (Path *)Lst_Datum (ln);
if (Lst_Member(path, (void *)p) == NULL) {
p->refCount += 1;
(void)Lst_AtEnd (path, (void *)p);
}
} else {
if (DEBUG(DIR)) {
printf("Caching %s...", name);
fflush(stdout);
}
if ((d = opendir (name)) != (DIR *) NULL) {
p = (Path *) emalloc (sizeof (Path));
p->name = estrdup (name);
p->hits = 0;
p->refCount = 1;
Hash_InitTable (&p->files, -1);
while ((dp = readdir (d)) != (struct dirent *) 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;
(void)Hash_CreateEntry(&p->files, dp->d_name, (Boolean *)NULL);
}
(void) closedir (d);
(void)Lst_AtEnd (openDirectories, (void *)p);
(void)Lst_AtEnd (path, (void *)p);
}
if (DEBUG(DIR)) {
printf("done\n");
}
}
}
/*-
*-----------------------------------------------------------------------
* Dir_CopyDir --
* Callback function for duplicating a search path via Lst_Duplicate.
* Ups the reference count for the directory.
*
* Results:
* Returns the Path it was given.
*
* Side Effects:
* The refCount of the path is incremented.
*
*-----------------------------------------------------------------------
*/
void *
Dir_CopyDir(p)
void * p;
{
((Path *) p)->refCount += 1;
return ((void *)p);
}
/*-
*-----------------------------------------------------------------------
* Dir_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.
*
* Side Effects:
* None
*-----------------------------------------------------------------------
*/
char *
Dir_MakeFlags (flag, path)
char *flag; /* flag which should precede each directory */
Lst path; /* list of directories */
{
char *str; /* the string which will be returned */
char *tstr; /* the current directory preceded by 'flag' */
LstNode ln; /* the node of the current directory */
Path *p; /* the structure describing the current directory */
str = estrdup ("");
if (Lst_Open (path) == SUCCESS) {
while ((ln = Lst_Next (path)) != NULL) {
p = (Path *) Lst_Datum (ln);
tstr = str_concat (flag, p->name, 0);
str = str_concat (str, tstr, STR_ADDSPACE | STR_DOFREE);
}
Lst_Close (path);
}
return (str);
}
/*-
*-----------------------------------------------------------------------
* Dir_Destroy --
* Nuke a directory descriptor, if possible. Callback procedure
* for the suffixes module when destroying a search path.
*
* Results:
* None.
*
* Side Effects:
* If no other path references this directory (refCount == 0),
* the Path and all its data are freed.
*
*-----------------------------------------------------------------------
*/
void
Dir_Destroy (pp)
void * pp; /* The directory descriptor to nuke */
{
Path *p = (Path *) pp;
p->refCount -= 1;
if (p->refCount == 0) {
LstNode ln;
ln = Lst_Member (openDirectories, (void *)p);
(void) Lst_Remove (openDirectories, ln);
Hash_DeleteTable (&p->files);
free(p->name);
free(p);
}
}
/*-
*-----------------------------------------------------------------------
* Dir_ClearPath --
* Clear out all elements of the given search path. This is different
* from destroying the list, notice.
*
* Results:
* None.
*
* Side Effects:
* The path is set to the empty list.
*
*-----------------------------------------------------------------------
*/
void
Dir_ClearPath(path)
Lst path; /* Path to clear */
{
Path *p;
while (!Lst_IsEmpty(path)) {
p = (Path *)Lst_DeQueue(path);
Dir_Destroy((void *) p);
}
}
/*-
*-----------------------------------------------------------------------
* Dir_Concat --
* Concatenate two paths, adding the second to the end of the first.
* Makes sure to avoid duplicates.
*
* Results:
* None
*
* Side Effects:
* Reference counts for added dirs are upped.
*
*-----------------------------------------------------------------------
*/
void
Dir_Concat(path1, path2)
Lst path1; /* Dest */
Lst path2; /* Source */
{
LstNode ln;
Path *p;
for (ln = Lst_First(path2); ln != NULL; ln = Lst_Succ(ln)) {
p = (Path *)Lst_Datum(ln);
if (Lst_Member(path1, (void *)p) == NULL) {
p->refCount += 1;
(void)Lst_AtEnd(path1, (void *)p);
}
}
}
/********** DEBUG INFO **********/
void
Dir_PrintDirectories()
{
LstNode ln;
Path *p;
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");
if (Lst_Open (openDirectories) == SUCCESS) {
while ((ln = Lst_Next (openDirectories)) != NULL) {
p = (Path *) Lst_Datum (ln);
printf ("# %-20s %10d\t%4d\n", p->name, p->refCount, p->hits);
}
Lst_Close (openDirectories);
}
}
static int DirPrintDir (p, dummy)
void * p;
void * dummy;
{
printf ("%s ", ((Path *) p)->name);
return (dummy ? 0 : 0);
}
void
Dir_PrintPath (path)
Lst path;
{
Lst_ForEach (path, DirPrintDir, (void *)0);
}
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