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Diffstat (limited to 'usr.bin/make/dir.c')
| -rw-r--r-- | usr.bin/make/dir.c | 1274 |
1 files changed, 1274 insertions, 0 deletions
diff --git a/usr.bin/make/dir.c b/usr.bin/make/dir.c new file mode 100644 index 000000000000..e515fbb731e1 --- /dev/null +++ b/usr.bin/make/dir.c @@ -0,0 +1,1274 @@ +/* + * Copyright (c) 1988, 1989, 1990, 1993 + * The Regents of the University of California. All rights reserved. + * 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 lint +static char sccsid[] = "@(#)dir.c 8.3 (Berkeley) 4/28/95"; +#endif /* not lint */ + +/*- + * 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 <dirent.h> +#include <sys/stat.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 __P((ClientData, ClientData)); +static int DirMatchFiles __P((char *, Path *, Lst)); +static void DirExpandCurly __P((char *, char *, Lst, Lst)); +static void DirExpandInt __P((char *, Lst, Lst)); +static int DirPrintWord __P((ClientData, ClientData)); +static int DirPrintDir __P((ClientData, ClientData)); + +/*- + *----------------------------------------------------------------------- + * 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); + + /* + * 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((ClientData) 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) + ClientData p; /* Current name */ + ClientData 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 */ +{ + register 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 ? 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. + * + * 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)) != NILLNODE) { + 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) + ClientData word; + ClientData 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, (ClientData) 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 */ +{ + register char *p1; /* pointer into p->name */ + register char *p2; /* pointer into name */ + LstNode ln; /* a list element */ + register char *file; /* the current filename to check */ + register Path *p; /* current path member */ + register 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 (strdup (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)) != NILLNODE) { + 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)) != NILLNODE) { + 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 = strdup(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 == NILLNODE) { + return ((char *) NULL); + } else { + p = (Path *) Lst_Datum (ln); + } + + if (Hash_FindEntry (&p->files, cp) != (Hash_Entry *)NULL) { + return (strdup (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(strdup(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 (strdup (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 = strdup(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 file system. + */ + 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 */ + register Path *p; /* pointer to new Path structure */ + DIR *d; /* for reading directory */ + register struct dirent *dp; /* entry in directory */ + + ln = Lst_Find (openDirectories, (ClientData)name, DirFindName); + if (ln != NILLNODE) { + p = (Path *)Lst_Datum (ln); + if (Lst_Member(path, (ClientData)p) == NILLNODE) { + p->refCount += 1; + (void)Lst_AtEnd (path, (ClientData)p); + } + } else { + if (DEBUG(DIR)) { + printf("Caching %s...", name); + fflush(stdout); + } + + if ((d = opendir (name)) != (DIR *) NULL) { + p = (Path *) emalloc (sizeof (Path)); + p->name = strdup (name); + p->hits = 0; + p->refCount = 1; + Hash_InitTable (&p->files, -1); + + /* + * Skip the first two entries -- these will *always* be . and .. + */ + (void)readdir(d); + (void)readdir(d); + + while ((dp = readdir (d)) != (struct dirent *) NULL) { +#ifdef sun + /* + * 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 */ + (void)Hash_CreateEntry(&p->files, dp->d_name, (Boolean *)NULL); + } + (void) closedir (d); + (void)Lst_AtEnd (openDirectories, (ClientData)p); + (void)Lst_AtEnd (path, (ClientData)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. + * + *----------------------------------------------------------------------- + */ +ClientData +Dir_CopyDir(p) + ClientData p; +{ + ((Path *) p)->refCount += 1; + + return ((ClientData)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 = strdup (""); + + if (Lst_Open (path) == SUCCESS) { + while ((ln = Lst_Next (path)) != NILLNODE) { + 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) + ClientData pp; /* The directory descriptor to nuke */ +{ + Path *p = (Path *) pp; + p->refCount -= 1; + + if (p->refCount == 0) { + LstNode ln; + + ln = Lst_Member (openDirectories, (ClientData)p); + (void) Lst_Remove (openDirectories, ln); + + Hash_DeleteTable (&p->files); + free((Address)p->name); + free((Address)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((ClientData) 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 != NILLNODE; ln = Lst_Succ(ln)) { + p = (Path *)Lst_Datum(ln); + if (Lst_Member(path1, (ClientData)p) == NILLNODE) { + p->refCount += 1; + (void)Lst_AtEnd(path1, (ClientData)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)) != NILLNODE) { + 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) + ClientData p; + ClientData dummy; +{ + printf ("%s ", ((Path *) p)->name); + return (dummy ? 0 : 0); +} + +void +Dir_PrintPath (path) + Lst path; +{ + Lst_ForEach (path, DirPrintDir, (ClientData)0); +} |