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minix/commands/bmake/dir.c
Arun Thomas 4b02d003db Import NetBSD's make
2010-02-04 16:52:54 +00:00

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/* $NetBSD: dir.c,v 1.61 2009/01/24 10:59:09 dsl Exp $ */
/*
* Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
* 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. 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.
*/
/*
* 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.
*/
#ifndef MAKE_NATIVE
static char rcsid[] = "$NetBSD: dir.c,v 1.61 2009/01/24 10:59:09 dsl Exp $";
#else
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)dir.c 8.2 (Berkeley) 1/2/94";
#else
__RCSID("$NetBSD: dir.c,v 1.61 2009/01/24 10:59:09 dsl Exp $");
#endif
#endif /* not lint */
#endif
/*-
* 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_InitCur Set the cur Path.
*
* Dir_InitDot Set the dot Path.
*
* Dir_End Cleanup the module.
*
* Dir_SetPATH Set ${.PATH} to reflect state of dirSearchPath.
*
* 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_FindHereOrAbove Search for a path in the current directory and
* then all the directories above it in turn until
* the path is found or we reach the root ("/").
*
* 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 <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <errno.h>
#include <stdio.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 Path *cur; /* contents of current directory, if not dot */
static Path *dotLast; /* a fake path entry indicating we need to
* look for . last */
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(const void *, const void *);
static int DirMatchFiles(const char *, Path *, Lst);
static void DirExpandCurly(const char *, const char *, Lst, Lst);
static void DirExpandInt(const char *, Lst, Lst);
static int DirPrintWord(void *, void *);
static int DirPrintDir(void *, void *);
static char *DirLookup(Path *, const char *, const char *, Boolean);
static char *DirLookupSubdir(Path *, const char *);
static char *DirFindDot(Boolean, const char *, const char *);
static char *DirLookupAbs(Path *, const char *, const char *);
/*-
*-----------------------------------------------------------------------
* Dir_Init --
* initialize things for this module
*
* Results:
* none
*
* Side Effects:
* some directories may be opened.
*-----------------------------------------------------------------------
*/
void
Dir_Init(const char *cdname)
{
dirSearchPath = Lst_Init(FALSE);
openDirectories = Lst_Init(FALSE);
Hash_InitTable(&mtimes, 0);
Dir_InitCur(cdname);
dotLast = bmake_malloc(sizeof(Path));
dotLast->refCount = 1;
dotLast->hits = 0;
dotLast->name = bmake_strdup(".DOTLAST");
Hash_InitTable(&dotLast->files, -1);
}
/*
* Called by Dir_Init() and whenever .CURDIR is assigned to.
*/
void
Dir_InitCur(const char *cdname)
{
Path *p;
if (cdname != NULL) {
/*
* Our build directory is not the same as our source directory.
* Keep this one around too.
*/
if ((p = Dir_AddDir(NULL, cdname))) {
p->refCount += 1;
if (cur && cur != p) {
/*
* We've been here before, cleanup.
*/
cur->refCount -= 1;
Dir_Destroy(cur);
}
cur = p;
}
}
}
/*-
*-----------------------------------------------------------------------
* Dir_InitDot --
* (re)initialize "dot" (current/object directory) path hash
*
* Results:
* none
*
* Side Effects:
* some directories may be opened.
*-----------------------------------------------------------------------
*/
void
Dir_InitDot(void)
{
if (dot != NULL) {
LstNode ln;
/* Remove old entry from openDirectories, but do not destroy. */
ln = Lst_Member(openDirectories, dot);
(void)Lst_Remove(openDirectories, ln);
}
dot = Dir_AddDir(NULL, ".");
if (dot == NULL) {
Error("Cannot open `.' (%s)", strerror(errno));
exit(1);
}
/*
* We always need to have dot around, so we increment its reference count
* to make sure it's not destroyed.
*/
dot->refCount += 1;
Dir_SetPATH(); /* initialize */
}
/*-
*-----------------------------------------------------------------------
* Dir_End --
* cleanup things for this module
*
* Results:
* none
*
* Side Effects:
* none
*-----------------------------------------------------------------------
*/
void
Dir_End(void)
{
#ifdef CLEANUP
if (cur) {
cur->refCount -= 1;
Dir_Destroy(cur);
}
dot->refCount -= 1;
dotLast->refCount -= 1;
Dir_Destroy(dotLast);
Dir_Destroy(dot);
Dir_ClearPath(dirSearchPath);
Lst_Destroy(dirSearchPath, NULL);
Dir_ClearPath(openDirectories);
Lst_Destroy(openDirectories, NULL);
Hash_DeleteTable(&mtimes);
#endif
}
/*
* We want ${.PATH} to indicate the order in which we will actually
* search, so we rebuild it after any .PATH: target.
* This is the simplest way to deal with the effect of .DOTLAST.
*/
void
Dir_SetPATH(void)
{
LstNode ln; /* a list element */
Path *p;
Boolean hasLastDot = FALSE; /* true we should search dot last */
Var_Delete(".PATH", VAR_GLOBAL);
if (Lst_Open(dirSearchPath) == SUCCESS) {
if ((ln = Lst_First(dirSearchPath)) != NULL) {
p = (Path *)Lst_Datum(ln);
if (p == dotLast) {
hasLastDot = TRUE;
Var_Append(".PATH", dotLast->name, VAR_GLOBAL);
}
}
if (!hasLastDot) {
if (dot)
Var_Append(".PATH", dot->name, VAR_GLOBAL);
if (cur)
Var_Append(".PATH", cur->name, VAR_GLOBAL);
}
while ((ln = Lst_Next(dirSearchPath)) != NULL) {
p = (Path *)Lst_Datum(ln);
if (p == dotLast)
continue;
if (p == dot && hasLastDot)
continue;
Var_Append(".PATH", p->name, VAR_GLOBAL);
}
if (hasLastDot) {
if (dot)
Var_Append(".PATH", dot->name, VAR_GLOBAL);
if (cur)
Var_Append(".PATH", cur->name, VAR_GLOBAL);
}
Lst_Close(dirSearchPath);
}
}
/*-
*-----------------------------------------------------------------------
* 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.
*
* Input:
* p Current name
* dname Desired name
*
* Results:
* 0 if it is the same. Non-zero otherwise
*
* Side Effects:
* None
*-----------------------------------------------------------------------
*/
static int
DirFindName(const void *p, const void *dname)
{
return (strcmp(((const Path *)p)->name, dname));
}
/*-
*-----------------------------------------------------------------------
* Dir_HasWildcards --
* see if the given name has any wildcard characters in it
* be careful not to expand unmatching brackets or braces.
* XXX: This code is not 100% correct. ([^]] fails etc.)
* I really don't think that make(1) should be expanding
* patterns, because then you have to set a mechanism for
* escaping the expansion!
*
* Input:
* name name to check
*
* Results:
* returns TRUE if the word should be expanded, FALSE otherwise
*
* Side Effects:
* none
*-----------------------------------------------------------------------
*/
Boolean
Dir_HasWildcards(char *name)
{
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 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.
*
* Input:
* pattern Pattern to look for
* p Directory to search
* expansion Place to store the results
*
* 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, Path *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] == '.')))
{
(void)Lst_AtEnd(expansions,
(isDot ? bmake_strdup(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.
*
* Input:
* word Entire word to expand
* brace First curly brace in it
* path Search path to use
* expansions Place to store the expansions
*
* Results:
* None.
*
* Side Effects:
* The given list is filled with the expansions...
*
*-----------------------------------------------------------------------
*/
static void
DirExpandCurly(const char *word, const char *brace, Lst 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 = bmake_malloc(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...
*
* Input:
* word Word to expand
* path Path on which to look
* expansions Place to store the result
*
* Results:
* None.
*
* Side Effects:
* Things are added to the expansions list.
*
*-----------------------------------------------------------------------
*/
static void
DirExpandInt(const char *word, Lst path, Lst expansions)
{
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(void *word, void *dummy)
{
fprintf(debug_file, "%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.
*
* Input:
* word the word to expand
* path the list of directories in which to find the
* resulting files
* expansions the list on which to place the results
*
* 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(const char *word, Lst path, Lst expansions)
{
const char *cp;
if (DEBUG(DIR)) {
fprintf(debug_file, "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];
((char *)UNCONST(cp))[1] = '\0';
dirpath = Dir_FindFile(word, path);
((char *)UNCONST(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 != NULL) {
char *dp = &dirpath[strlen(dirpath) - 1];
if (*dp == '/')
*dp = '\0';
path = Lst_Init(FALSE);
(void)Dir_AddDir(path, dirpath);
DirExpandInt(cp+1, path, expansions);
Lst_Destroy(path, NULL);
}
} 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, NULL);
fprintf(debug_file, "\n");
}
}
/*-
*-----------------------------------------------------------------------
* DirLookup --
* Find if the file with the given name exists in the given 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:
* None.
*-----------------------------------------------------------------------
*/
static char *
DirLookup(Path *p, const char *name __unused, const char *cp,
Boolean hasSlash __unused)
{
char *file; /* the current filename to check */
if (DEBUG(DIR)) {
fprintf(debug_file, " %s ...\n", p->name);
}
if (Hash_FindEntry(&p->files, cp) == NULL)
return NULL;
file = str_concat(p->name, cp, STR_ADDSLASH);
if (DEBUG(DIR)) {
fprintf(debug_file, " returning %s\n", file);
}
p->hits += 1;
hits += 1;
return file;
}
/*-
*-----------------------------------------------------------------------
* DirLookupSubdir --
* Find if the file with the given name exists in the given 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, it is added in the modification times hash
* table.
*-----------------------------------------------------------------------
*/
static char *
DirLookupSubdir(Path *p, const char *name)
{
struct stat stb; /* Buffer for stat, if necessary */
Hash_Entry *entry; /* Entry for mtimes table */
char *file; /* the current filename to check */
if (p != dot) {
file = str_concat(p->name, name, STR_ADDSLASH);
} else {
/*
* Checking in dot -- DON'T put a leading ./ on the thing.
*/
file = bmake_strdup(name);
}
if (DEBUG(DIR)) {
fprintf(debug_file, "checking %s ...\n", file);
}
if (stat(file, &stb) == 0) {
if (stb.st_mtime == 0)
stb.st_mtime = 1;
/*
* Save the modification time so if it's needed, we don't have
* to fetch it again.
*/
if (DEBUG(DIR)) {
fprintf(debug_file, " Caching %s for %s\n", Targ_FmtTime(stb.st_mtime),
file);
}
entry = Hash_CreateEntry(&mtimes, file, NULL);
Hash_SetTimeValue(entry, stb.st_mtime);
nearmisses += 1;
return (file);
}
free(file);
return NULL;
}
/*-
*-----------------------------------------------------------------------
* DirLookupAbs --
* Find if the file with the given name exists in the given path.
*
* Results:
* The path to the file, the empty string or NULL. If the file is
* the empty string, the search should be terminated.
* This path is guaranteed to be in a different part of memory
* than name and so may be safely free'd.
*
* Side Effects:
* None.
*-----------------------------------------------------------------------
*/
static char *
DirLookupAbs(Path *p, const char *name, const char *cp)
{
char *p1; /* pointer into p->name */
const char *p2; /* pointer into name */
if (DEBUG(DIR)) {
fprintf(debug_file, " %s ...\n", p->name);
}
/*
* If the file has a leading path component and that component
* exactly matches the entire name of the current search
* directory, we can attempt another cache lookup. And if we don't
* have a hit, we can safely assume the file does not exist at all.
*/
for (p1 = p->name, p2 = name; *p1 && *p1 == *p2; p1++, p2++) {
continue;
}
if (*p1 != '\0' || p2 != cp - 1) {
return NULL;
}
if (Hash_FindEntry(&p->files, cp) == NULL) {
if (DEBUG(DIR)) {
fprintf(debug_file, " must be here but isn't -- returning\n");
}
/* Return empty string: terminates search */
return bmake_strdup("");
}
p->hits += 1;
hits += 1;
if (DEBUG(DIR)) {
fprintf(debug_file, " returning %s\n", name);
}
return (bmake_strdup(name));
}
/*-
*-----------------------------------------------------------------------
* DirFindDot --
* Find the file given on "." or curdir
*
* 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:
* Hit counts change
*-----------------------------------------------------------------------
*/
static char *
DirFindDot(Boolean hasSlash __unused, const char *name, const char *cp)
{
if (Hash_FindEntry(&dot->files, cp) != NULL) {
if (DEBUG(DIR)) {
fprintf(debug_file, " in '.'\n");
}
hits += 1;
dot->hits += 1;
return (bmake_strdup(name));
}
if (cur &&
Hash_FindEntry(&cur->files, cp) != NULL) {
if (DEBUG(DIR)) {
fprintf(debug_file, " in ${.CURDIR} = %s\n", cur->name);
}
hits += 1;
cur->hits += 1;
return str_concat(cur->name, cp, STR_ADDSLASH);
}
return NULL;
}
/*-
*-----------------------------------------------------------------------
* Dir_FindFile --
* Find the file with the given name along the given search path.
*
* Input:
* name the file to find
* path the Lst of directories to search
*
* 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(const char *name, Lst path)
{
LstNode ln; /* a list element */
char *file; /* the current filename to check */
Path *p; /* current path member */
const char *cp; /* Terminal name of file */
Boolean hasLastDot = FALSE; /* true we should search dot last */
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)) {
fprintf(debug_file, "Searching for %s ...", name);
}
if (Lst_Open(path) == FAILURE) {
if (DEBUG(DIR)) {
fprintf(debug_file, "couldn't open path, file not found\n");
}
misses += 1;
return NULL;
}
if ((ln = Lst_First(path)) != NULL) {
p = (Path *)Lst_Datum(ln);
if (p == dotLast) {
hasLastDot = TRUE;
if (DEBUG(DIR))
fprintf(debug_file, "[dot last]...");
}
}
if (DEBUG(DIR)) {
fprintf(debug_file, "\n");
}
/*
* If there's no leading directory components or if the leading
* directory component is exactly `./', consult the cached contents
* of each of the directories on the search path.
*/
if (!hasSlash || (cp - name == 2 && *name == '.')) {
/*
* We look through all the directories on the path seeking one which
* contains the final component of the given name. 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...
*
* No matter what, we always look for the file in the current
* directory before anywhere else (unless we found the magic
* DOTLAST path, in which case we search it last) 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 (!hasLastDot &&
(file = DirFindDot(hasSlash, name, cp)) != NULL) {
Lst_Close(path);
return file;
}
while ((ln = Lst_Next(path)) != NULL) {
p = (Path *)Lst_Datum(ln);
if (p == dotLast)
continue;
if ((file = DirLookup(p, name, cp, hasSlash)) != NULL) {
Lst_Close(path);
return file;
}
}
if (hasLastDot &&
(file = DirFindDot(hasSlash, name, cp)) != NULL) {
Lst_Close(path);
return file;
}
}
Lst_Close(path);
/*
* We didn't find the file on any directory in the search path.
* 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).
* [ This no longer applies: 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)) {
fprintf(debug_file, " failed.\n");
}
misses += 1;
return NULL;
}
if (name[0] != '/') {
Boolean checkedDot = FALSE;
if (DEBUG(DIR)) {
fprintf(debug_file, " Trying subdirectories...\n");
}
if (!hasLastDot) {
if (dot) {
checkedDot = TRUE;
if ((file = DirLookupSubdir(dot, name)) != NULL)
return file;
}
if (cur && (file = DirLookupSubdir(cur, name)) != NULL)
return file;
}
(void)Lst_Open(path);
while ((ln = Lst_Next(path)) != NULL) {
p = (Path *)Lst_Datum(ln);
if (p == dotLast)
continue;
if (p == dot) {
if (checkedDot)
continue;
checkedDot = TRUE;
}
if ((file = DirLookupSubdir(p, name)) != NULL) {
Lst_Close(path);
return file;
}
}
Lst_Close(path);
if (hasLastDot) {
if (dot && !checkedDot) {
checkedDot = TRUE;
if ((file = DirLookupSubdir(dot, name)) != NULL)
return file;
}
if (cur && (file = DirLookupSubdir(cur, name)) != NULL)
return file;
}
if (checkedDot) {
/*
* Already checked by the given name, since . was in the path,
* so no point in proceeding...
*/
if (DEBUG(DIR)) {
fprintf(debug_file, " Checked . already, returning NULL\n");
}
return NULL;
}
} else { /* name[0] == '/' */
/*
* For absolute names, compare directory path prefix against the
* the directory path of each member on the search path for an exact
* match. If we have an exact match on any member of the search path,
* use the cached contents of that member to lookup the final file
* component. If that lookup fails we can safely assume that the
* file does not exist at all. This is signified by DirLookupAbs()
* returning an empty string.
*/
if (DEBUG(DIR)) {
fprintf(debug_file, " Trying exact path matches...\n");
}
if (!hasLastDot && cur && (file = DirLookupAbs(cur, name, cp)) != NULL)
return *file?file:NULL;
(void)Lst_Open(path);
while ((ln = Lst_Next(path)) != NULL) {
p = (Path *)Lst_Datum(ln);
if (p == dotLast)
continue;
if ((file = DirLookupAbs(p, name, cp)) != NULL) {
Lst_Close(path);
return *file?file:NULL;
}
}
Lst_Close(path);
if (hasLastDot && cur && (file = DirLookupAbs(cur, name, cp)) != NULL)
return *file?file: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';
(void)Dir_AddDir(path, name);
cp[-1] = '/';
bigmisses += 1;
ln = Lst_Last(path);
if (ln == NULL) {
return NULL;
} else {
p = (Path *)Lst_Datum(ln);
}
if (Hash_FindEntry(&p->files, cp) != NULL) {
return (bmake_strdup(name));
} else {
return NULL;
}
#else /* !notdef */
if (DEBUG(DIR)) {
fprintf(debug_file, " Looking for \"%s\" ...\n", name);
}
bigmisses += 1;
entry = Hash_FindEntry(&mtimes, name);
if (entry != NULL) {
if (DEBUG(DIR)) {
fprintf(debug_file, " got it (in mtime cache)\n");
}
return(bmake_strdup(name));
} else if (stat(name, &stb) == 0) {
if (stb.st_mtime == 0)
stb.st_mtime = 1;
entry = Hash_CreateEntry(&mtimes, name, NULL);
if (DEBUG(DIR)) {
fprintf(debug_file, " Caching %s for %s\n", Targ_FmtTime(stb.st_mtime),
name);
}
Hash_SetTimeValue(entry, stb.st_mtime);
return (bmake_strdup(name));
} else {
if (DEBUG(DIR)) {
fprintf(debug_file, " failed. Returning NULL\n");
}
return NULL;
}
#endif /* notdef */
}
/*-
*-----------------------------------------------------------------------
* Dir_FindHereOrAbove --
* search for a path starting at a given directory and then working
* our way up towards the root.
*
* Input:
* here starting directory
* search_path the path we are looking for
* result the result of a successful search is placed here
* rlen the length of the result buffer
* (typically MAXPATHLEN + 1)
*
* Results:
* 0 on failure, 1 on success [in which case the found path is put
* in the result buffer].
*
* Side Effects:
*-----------------------------------------------------------------------
*/
int
Dir_FindHereOrAbove(char *here, char *search_path, char *result, int rlen) {
struct stat st;
char dirbase[MAXPATHLEN + 1], *db_end;
char try[MAXPATHLEN + 1], *try_end;
/* copy out our starting point */
snprintf(dirbase, sizeof(dirbase), "%s", here);
db_end = dirbase + strlen(dirbase);
/* loop until we determine a result */
while (1) {
/* try and stat(2) it ... */
snprintf(try, sizeof(try), "%s/%s", dirbase, search_path);
if (stat(try, &st) != -1) {
/*
* success! if we found a file, chop off
* the filename so we return a directory.
*/
if ((st.st_mode & S_IFMT) != S_IFDIR) {
try_end = try + strlen(try);
while (try_end > try && *try_end != '/')
try_end--;
if (try_end > try)
*try_end = 0; /* chop! */
}
/*
* done!
*/
snprintf(result, rlen, "%s", try);
return(1);
}
/*
* nope, we didn't find it. if we used up dirbase we've
* reached the root and failed.
*/
if (db_end == dirbase)
break; /* failed! */
/*
* truncate dirbase from the end to move up a dir
*/
while (db_end > dirbase && *db_end != '/')
db_end--;
*db_end = 0; /* chop! */
} /* while (1) */
/*
* we failed...
*/
return(0);
}
/*-
*-----------------------------------------------------------------------
* Dir_MTime --
* Find the modification time of the file described by gn along the
* search path dirSearchPath.
*
* Input:
* gn the file whose modification time is desired
*
* 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(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->type & OP_PHONY) {
gn->mtime = 0;
return 0;
} else if (gn->path == NULL) {
if (gn->type & OP_NOPATH)
fullName = NULL;
else {
fullName = Dir_FindFile(gn->name, Suff_FindPath(gn));
if (DEBUG(DIR))
fprintf(debug_file, "Found '%s' as '%s'\n",
gn->name, fullName ? fullName : "(not found)" );
}
} else {
fullName = gn->path;
}
if (fullName == NULL) {
fullName = bmake_strdup(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 file system.
*/
if (DEBUG(DIR)) {
fprintf(debug_file, "Using cached time %s for %s\n",
Targ_FmtTime(Hash_GetTimeValue(entry)), fullName);
}
stb.st_mtime = Hash_GetTimeValue(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;
}
} else if (stb.st_mtime == 0) {
/*
* 0 handled specially by the code, if the time is really 0, return
* something else instead
*/
stb.st_mtime = 1;
}
if (fullName && gn->path == 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...
*
* Input:
* path the path to which the directory should be
* added
* name the name of the directory to add
*
* Results:
* none
*
* Side Effects:
* A structure is added to the list and the directory is
* read and hashed.
*-----------------------------------------------------------------------
*/
Path *
Dir_AddDir(Lst path, const char *name)
{
LstNode ln = NULL; /* node in case Path structure is found */
Path *p = NULL; /* pointer to new Path structure */
DIR *d; /* for reading directory */
struct dirent *dp; /* entry in directory */
if (strcmp(name, ".DOTLAST") == 0) {
ln = Lst_Find(path, name, DirFindName);
if (ln != NULL)
return (Path *)Lst_Datum(ln);
else {
dotLast->refCount += 1;
(void)Lst_AtFront(path, dotLast);
}
}
if (path)
ln = Lst_Find(openDirectories, name, DirFindName);
if (ln != NULL) {
p = (Path *)Lst_Datum(ln);
if (path && Lst_Member(path, p) == NULL) {
p->refCount += 1;
(void)Lst_AtEnd(path, p);
}
} else {
if (DEBUG(DIR)) {
fprintf(debug_file, "Caching %s ...", name);
}
if ((d = opendir(name)) != NULL) {
p = bmake_malloc(sizeof(Path));
p->name = bmake_strdup(name);
p->hits = 0;
p->refCount = 1;
Hash_InitTable(&p->files, -1);
while ((dp = readdir(d)) != 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 */
(void)Hash_CreateEntry(&p->files, dp->d_name, NULL);
}
(void)closedir(d);
(void)Lst_AtEnd(openDirectories, p);
if (path != NULL)
(void)Lst_AtEnd(path, p);
}
if (DEBUG(DIR)) {
fprintf(debug_file, "done\n");
}
}
return p;
}
/*-
*-----------------------------------------------------------------------
* 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(void *p)
{
((Path *)p)->refCount += 1;
return (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.
*
* Input:
* flag flag which should precede each directory
* path list of directories
*
* 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(const char *flag, Lst path)
{
char *str; /* the string which will be returned */
char *s1, *s2;/* the current directory preceded by 'flag' */
LstNode ln; /* the node of the current directory */
Path *p; /* the structure describing the current directory */
str = bmake_strdup("");
if (Lst_Open(path) == SUCCESS) {
while ((ln = Lst_Next(path)) != NULL) {
p = (Path *)Lst_Datum(ln);
s2 = str_concat(flag, p->name, 0);
str = str_concat(s1 = str, s2, STR_ADDSPACE);
free(s1);
free(s2);
}
Lst_Close(path);
}
return (str);
}
/*-
*-----------------------------------------------------------------------
* Dir_Destroy --
* Nuke a directory descriptor, if possible. Callback procedure
* for the suffixes module when destroying a search path.
*
* Input:
* pp The directory descriptor to nuke
*
* Results:
* None.
*
* Side Effects:
* If no other path references this directory (refCount == 0),
* the Path and all its data are freed.
*
*-----------------------------------------------------------------------
*/
void
Dir_Destroy(void *pp)
{
Path *p = (Path *)pp;
p->refCount -= 1;
if (p->refCount == 0) {
LstNode ln;
ln = Lst_Member(openDirectories, 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.
*
* Input:
* path Path to clear
*
* Results:
* None.
*
* Side Effects:
* The path is set to the empty list.
*
*-----------------------------------------------------------------------
*/
void
Dir_ClearPath(Lst path)
{
Path *p;
while (!Lst_IsEmpty(path)) {
p = (Path *)Lst_DeQueue(path);
Dir_Destroy(p);
}
}
/*-
*-----------------------------------------------------------------------
* Dir_Concat --
* Concatenate two paths, adding the second to the end of the first.
* Makes sure to avoid duplicates.
*
* Input:
* path1 Dest
* path2 Source
*
* Results:
* None
*
* Side Effects:
* Reference counts for added dirs are upped.
*
*-----------------------------------------------------------------------
*/
void
Dir_Concat(Lst path1, Lst path2)
{
LstNode ln;
Path *p;
for (ln = Lst_First(path2); ln != NULL; ln = Lst_Succ(ln)) {
p = (Path *)Lst_Datum(ln);
if (Lst_Member(path1, p) == NULL) {
p->refCount += 1;
(void)Lst_AtEnd(path1, p);
}
}
}
/********** DEBUG INFO **********/
void
Dir_PrintDirectories(void)
{
LstNode ln;
Path *p;
fprintf(debug_file, "#*** Directory Cache:\n");
fprintf(debug_file, "# 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));
fprintf(debug_file, "# %-20s referenced\thits\n", "directory");
if (Lst_Open(openDirectories) == SUCCESS) {
while ((ln = Lst_Next(openDirectories)) != NULL) {
p = (Path *)Lst_Datum(ln);
fprintf(debug_file, "# %-20s %10d\t%4d\n", p->name, p->refCount, p->hits);
}
Lst_Close(openDirectories);
}
}
static int
DirPrintDir(void *p, void *dummy)
{
fprintf(debug_file, "%s ", ((Path *)p)->name);
return (dummy ? 0 : 0);
}
void
Dir_PrintPath(Lst path)
{
Lst_ForEach(path, DirPrintDir, NULL);
}
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