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-rw-r--r--Utilities/cmlibarchive/examples/minitar/tree.c423
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diff --git a/Utilities/cmlibarchive/examples/minitar/tree.c b/Utilities/cmlibarchive/examples/minitar/tree.c
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--- a/Utilities/cmlibarchive/examples/minitar/tree.c
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-/*-
- * Copyright (c) 2003-2004 Tim Kientzle
- * All rights reserved.
- *
- * 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
- * in this position and unchanged.
- * 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.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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 AUTHOR(S) 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.
- */
-
-/*-
- * There is a single list of "tree_entry" items that represent
- * filesystem objects that require further attention. Non-directories
- * are not kept in memory: they are pulled from readdir(), returned to
- * the client, then freed as soon as possible. Any directory entry to
- * be traversed gets pushed onto the stack.
- *
- * There is surprisingly little information that needs to be kept for
- * each item on the stack. Just the name, depth (represented here as the
- * string length of the parent directory's pathname), and some markers
- * indicating how to get back to the parent (via chdir("..") for a
- * regular dir or via fchdir(2) for a symlink).
- */
-
-#include <sys/stat.h>
-#include <dirent.h>
-#include <fcntl.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include "tree.h"
-
-/*
- * TODO:
- * 1) Loop checking.
- * 3) Arbitrary logical traversals by closing/reopening intermediate fds.
- */
-
-struct tree_entry {
- struct tree_entry *next;
- char *name;
- size_t dirname_length;
- int fd;
- int flags;
-};
-
-/* Definitions for tree_entry.flags bitmap. */
-#define isDir 1 /* This entry is a regular directory. */
-#define isDirLink 2 /* This entry is a symbolic link to a directory. */
-#define needsTraversal 4 /* This entry hasn't yet been traversed. */
-
-/*
- * Local data for this package.
- */
-struct tree {
- struct tree_entry *stack;
- DIR *d;
- int initialDirFd;
- int flags;
-
- char *buff;
- char *basename;
- size_t buff_length;
- size_t path_length;
- size_t dirname_length;
-
- int depth;
- int openCount;
- int maxOpenCount;
-
- struct stat lst;
- struct stat st;
-};
-
-/* Definitions for tree.flags bitmap. */
-#define needsReturn 8 /* Marks first entry as not having been returned yet. */
-#define hasStat 16 /* The st entry is set. */
-#define hasLstat 32 /* The lst entry is set. */
-
-
-#define HAVE_DIRENT_D_NAMLEN 1
-#ifdef HAVE_DIRENT_D_NAMLEN
-/* BSD extension; avoids need for a strlen() call. */
-#define D_NAMELEN(dp) (dp)->d_namlen
-#else
-#define D_NAMELEN(dp) (strlen((dp)->d_name))
-#endif
-
-#if 0
-static void
-dumpStack(struct tree *t)
-{
- struct tree_entry *te;
-
- printf("\tbuff: %s\n", t->buff);
- printf("\tpwd: "); fflush(stdout); system("pwd");
- printf("\tstack:\n");
- for (te = t->stack; te != NULL; te = te->next) {
- printf("\t\tte->name: %s %s\n", te->name, te->flags & needsTraversal ? "" : "*");
- }
-}
-#endif
-
-/*
- * Add a directory path to the current stack.
- */
-static void
-tree_add(struct tree *t, const char *path)
-{
- struct tree_entry *te;
-
- te = malloc(sizeof(*te));
- memset(te, 0, sizeof(*te));
- te->next = t->stack;
- t->stack = te;
- te->fd = -1;
- te->name = strdup(path);
- te->flags = needsTraversal;
- te->dirname_length = t->dirname_length;
-}
-
-/*
- * Append a name to the current path.
- */
-static void
-tree_append(struct tree *t, const char *name, size_t name_length)
-{
- if (t->buff != NULL)
- t->buff[t->dirname_length] = '\0';
-
- /* Resize pathname buffer as needed. */
- while (name_length + 1 + t->dirname_length >= t->buff_length) {
- t->buff_length *= 2;
- if (t->buff_length < 1024)
- t->buff_length = 1024;
- t->buff = realloc(t->buff, t->buff_length);
- }
- t->basename = t->buff + t->dirname_length;
- t->path_length = t->dirname_length + name_length;
- if (t->dirname_length > 0) {
- *t->basename++ = '/';
- t->path_length ++;
- }
- strcpy(t->basename, name);
-}
-
-/*
- * Open a directory tree for traversal.
- */
-struct tree *
-tree_open(const char *path)
-{
- struct tree *t;
-
- t = malloc(sizeof(*t));
- memset(t, 0, sizeof(*t));
- tree_append(t, path, strlen(path));
- t->initialDirFd = open(".", O_RDONLY);
- /*
- * During most of the traversal, items are set up and then
- * returned immediately from tree_next(). That doesn't work
- * for the very first entry, so we set a flag for this special
- * case.
- */
- t->flags = needsReturn;
- return (t);
-}
-
-/*
- * We've finished a directory; ascend back to the parent.
- */
-static void
-tree_ascend(struct tree *t)
-{
- struct tree_entry *te;
-
- te = t->stack;
- t->depth--;
- if (te->flags & isDirLink) {
- fchdir(te->fd);
- close(te->fd);
- t->openCount--;
- } else {
- chdir("..");
- }
-}
-
-/*
- * Pop the working stack.
- */
-static void
-tree_pop(struct tree *t)
-{
- struct tree_entry *te;
-
- te = t->stack;
- t->stack = te->next;
- t->dirname_length = te->dirname_length;
- free(te->name);
- free(te);
-}
-
-/*
- * Get the next item in the tree traversal.
- */
-int
-tree_next(struct tree *t)
-{
- struct dirent *de = NULL;
-
- /* Handle the startup case by returning the initial entry. */
- if (t->flags & needsReturn) {
- t->flags &= ~needsReturn;
- return (1);
- }
-
- while (t->stack != NULL) {
- /* If there's an open dir, get the next entry from there. */
- while (t->d != NULL) {
- de = readdir(t->d);
- if (de == NULL) {
- closedir(t->d);
- t->d = NULL;
- } else if (de->d_name[0] == '.'
- && de->d_name[1] == '\0') {
- /* Skip '.' */
- } else if (de->d_name[0] == '.'
- && de->d_name[1] == '.'
- && de->d_name[2] == '\0') {
- /* Skip '..' */
- } else {
- /*
- * Append the path to the current path
- * and return it.
- */
- tree_append(t, de->d_name, D_NAMELEN(de));
- t->flags &= ~hasLstat;
- t->flags &= ~hasStat;
- return (1);
- }
- }
-
- /* If the current dir needs to be traversed, set it up. */
- if (t->stack->flags & needsTraversal) {
- tree_append(t, t->stack->name, strlen(t->stack->name));
- t->stack->flags &= ~needsTraversal;
- /* If it is a link, set up fd for the ascent. */
- if (t->stack->flags & isDirLink) {
- t->stack->fd = open(".", O_RDONLY);
- t->openCount++;
- if (t->openCount > t->maxOpenCount)
- t->maxOpenCount = t->openCount;
- }
- if (chdir(t->stack->name) == 0) {
- t->depth++;
- t->dirname_length = t->path_length;
- t->d = opendir(".");
- } else
- tree_pop(t);
- continue;
- }
-
- /* We've done everything necessary for the top stack entry. */
- tree_ascend(t);
- tree_pop(t);
- }
- return (0);
-}
-
-/*
- * Called by the client to mark the directory just returned from
- * tree_next() as needing to be visited.
- */
-void
-tree_descend(struct tree *t)
-{
- const struct stat *s = tree_current_lstat(t);
-
- if (S_ISDIR(s->st_mode)) {
- tree_add(t, t->basename);
- t->stack->flags |= isDir;
- }
-
- if (S_ISLNK(s->st_mode) && S_ISDIR(tree_current_stat(t)->st_mode)) {
- tree_add(t, t->basename);
- t->stack->flags |= isDirLink;
- }
-}
-
-/*
- * Get the stat() data for the entry just returned from tree_next().
- */
-const struct stat *
-tree_current_stat(struct tree *t)
-{
- if (!(t->flags & hasStat)) {
- stat(t->basename, &t->st);
- t->flags |= hasStat;
- }
- return (&t->st);
-}
-
-/*
- * Get the lstat() data for the entry just returned from tree_next().
- */
-const struct stat *
-tree_current_lstat(struct tree *t)
-{
- if (!(t->flags & hasLstat)) {
- lstat(t->basename, &t->lst);
- t->flags |= hasLstat;
- }
- return (&t->lst);
-}
-
-/*
- * Return the access path for the entry just returned from tree_next().
- */
-const char *
-tree_current_access_path(struct tree *t)
-{
- return (t->basename);
-}
-
-/*
- * Return the full path for the entry just returned from tree_next().
- */
-const char *
-tree_current_path(struct tree *t)
-{
- return (t->buff);
-}
-
-/*
- * Return the length of the path for the entry just returned from tree_next().
- */
-size_t
-tree_current_pathlen(struct tree *t)
-{
- return (t->path_length);
-}
-
-/*
- * Return the nesting depth of the entry just returned from tree_next().
- */
-int
-tree_current_depth(struct tree *t)
-{
- return (t->depth);
-}
-
-/*
- * Terminate the traversal and release any resources.
- */
-void
-tree_close(struct tree *t)
-{
- /* Release anything remaining in the stack. */
- while (t->stack != NULL)
- tree_pop(t);
- if (t->buff)
- free(t->buff);
- /* chdir() back to where we started. */
- if (t->initialDirFd >= 0) {
- fchdir(t->initialDirFd);
- close(t->initialDirFd);
- t->initialDirFd = -1;
- }
- free(t);
-}
-
-
-#if 0
-/* Main function for testing. */
-#include <stdio.h>
-
-int main(int argc, char **argv)
-{
- size_t max_path_len = 0;
- int max_depth = 0;
-
- system("pwd");
- while (*++argv) {
- struct tree *t = tree_open(*argv);
- while (tree_next(t)) {
- size_t path_len = tree_current_pathlen(t);
- int depth = tree_current_depth(t);
- if (path_len > max_path_len)
- max_path_len = path_len;
- if (depth > max_depth)
- max_depth = depth;
- printf("%s\n", tree_current_path(t));
- if (S_ISDIR(tree_current_lstat(t)->st_mode))
- tree_descend(t); /* Descend into every dir. */
- }
- tree_close(t);
- printf("Max path length: %d\n", max_path_len);
- printf("Max depth: %d\n", max_depth);
- printf("Final open count: %d\n", t->openCount);
- printf("Max open count: %d\n", t->maxOpenCount);
- fflush(stdout);
- system("pwd");
- }
- return (0);
-}
-#endif
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