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Editing: ftree.c
/*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 1992 Keith Muller. * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Keith Muller of the University of California, San Diego. * * 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. */ #ifndef lint #if 0 static char sccsid[] = "@(#)ftree.c 8.2 (Berkeley) 4/18/94"; #endif #endif /* not lint */ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); #include <sys/types.h> #include <sys/time.h> #include <sys/stat.h> #include <unistd.h> #include <string.h> #include <stdio.h> #include <errno.h> #include <stdlib.h> #include <fts.h> #include "pax.h" #include "ftree.h" #include "extern.h" /* * routines to interface with the fts library function. * * file args supplied to pax are stored on a single linked list (of type FTREE) * and given to fts to be processed one at a time. pax "selects" files from * the expansion of each arg into the corresponding file tree (if the arg is a * directory, otherwise the node itself is just passed to pax). The selection * is modified by the -n and -u flags. The user is informed when a specific * file arg does not generate any selected files. -n keeps expanding the file * tree arg until one of its files is selected, then skips to the next file * arg. when the user does not supply the file trees as command line args to * pax, they are read from stdin */ static FTS *ftsp = NULL; /* current FTS handle */ static int ftsopts; /* options to be used on fts_open */ static char *farray[2]; /* array for passing each arg to fts */ static FTREE *fthead = NULL; /* head of linked list of file args */ static FTREE *fttail = NULL; /* tail of linked list of file args */ static FTREE *ftcur = NULL; /* current file arg being processed */ static FTSENT *ftent = NULL; /* current file tree entry */ static int ftree_skip; /* when set skip to next file arg */ static int ftree_arg(void); /* * ftree_start() * initialize the options passed to fts_open() during this run of pax * options are based on the selection of pax options by the user * fts_start() also calls fts_arg() to open the first valid file arg. We * also attempt to reset directory access times when -t (tflag) is set. * Return: * 0 if there is at least one valid file arg to process, -1 otherwise */ int ftree_start(void) { /* * Set up the operation mode of fts, open the first file arg. We must * use FTS_NOCHDIR, as the user may have to open multiple archives and * if fts did a chdir off into the boondocks, we may create an archive * volume in a place where the user did not expect to. */ ftsopts = FTS_NOCHDIR; /* * optional user flags that effect file traversal * -H command line symlink follow only (half follow) * -L follow symlinks (logical) * -P do not follow symlinks (physical). This is the default. * -X do not cross over mount points * -t preserve access times on files read. * -n select only the first member of a file tree when a match is found * -d do not extract subtrees rooted at a directory arg. */ if (Lflag) ftsopts |= FTS_LOGICAL; else ftsopts |= FTS_PHYSICAL; if (Hflag) # ifdef NET2_FTS paxwarn(0, "The -H flag is not supported on this version"); # else ftsopts |= FTS_COMFOLLOW; # endif if (Xflag) ftsopts |= FTS_XDEV; if ((fthead == NULL) && ((farray[0] = malloc(PAXPATHLEN+2)) == NULL)) { paxwarn(1, "Unable to allocate memory for file name buffer"); return(-1); } if (ftree_arg() < 0) return(-1); if (tflag && (atdir_start() < 0)) return(-1); return(0); } /* * ftree_add() * add the arg to the linked list of files to process. Each will be * processed by fts one at a time * Return: * 0 if added to the linked list, -1 if failed */ int ftree_add(char *str, int chflg) { FTREE *ft; int len; /* * simple check for bad args */ if ((str == NULL) || (*str == '\0')) { paxwarn(0, "Invalid file name argument"); return(-1); } /* * allocate FTREE node and add to the end of the linked list (args are * processed in the same order they were passed to pax). Get rid of any * trailing / the user may pass us. (watch out for / by itself). */ if ((ft = (FTREE *)malloc(sizeof(FTREE))) == NULL) { paxwarn(0, "Unable to allocate memory for filename"); return(-1); } if (((len = strlen(str) - 1) > 0) && (str[len] == '/')) str[len] = '\0'; ft->fname = str; ft->refcnt = 0; ft->chflg = chflg; ft->fow = NULL; if (fthead == NULL) { fttail = fthead = ft; return(0); } fttail->fow = ft; fttail = ft; return(0); } /* * ftree_sel() * this entry has been selected by pax. bump up reference count and handle * -n and -d processing. */ void ftree_sel(ARCHD *arcn) { /* * set reference bit for this pattern. This linked list is only used * when file trees are supplied pax as args. The list is not used when * the trees are read from stdin. */ if (ftcur != NULL) ftcur->refcnt = 1; /* * if -n we are done with this arg, force a skip to the next arg when * pax asks for the next file in next_file(). * if -d we tell fts only to match the directory (if the arg is a dir) * and not the entire file tree rooted at that point. */ if (nflag) ftree_skip = 1; if (!dflag || (arcn->type != PAX_DIR)) return; if (ftent != NULL) (void)fts_set(ftsp, ftent, FTS_SKIP); } /* * ftree_notsel() * this entry has not been selected by pax. */ void ftree_notsel(void) { if (ftent != NULL) (void)fts_set(ftsp, ftent, FTS_SKIP); } /* * ftree_chk() * called at end on pax execution. Prints all those file args that did not * have a selected member (reference count still 0) */ void ftree_chk(void) { FTREE *ft; int wban = 0; /* * make sure all dir access times were reset. */ if (tflag) atdir_end(); /* * walk down list and check reference count. Print out those members * that never had a match */ for (ft = fthead; ft != NULL; ft = ft->fow) { if ((ft->refcnt > 0) || ft->chflg) continue; if (wban == 0) { paxwarn(1,"WARNING! These file names were not selected:"); ++wban; } (void)fprintf(stderr, "%s\n", ft->fname); } } /* * ftree_arg() * Get the next file arg for fts to process. Can be from either the linked * list or read from stdin when the user did not them as args to pax. Each * arg is processed until the first successful fts_open(). * Return: * 0 when the next arg is ready to go, -1 if out of file args (or EOF on * stdin). */ static int ftree_arg(void) { char *pt; /* * close off the current file tree */ if (ftsp != NULL) { (void)fts_close(ftsp); ftsp = NULL; } /* * keep looping until we get a valid file tree to process. Stop when we * reach the end of the list (or get an eof on stdin) */ for(;;) { if (fthead == NULL) { /* * the user didn't supply any args, get the file trees * to process from stdin; */ if (fgets(farray[0], PAXPATHLEN+1, stdin) == NULL) return(-1); if ((pt = strchr(farray[0], '\n')) != NULL) *pt = '\0'; } else { /* * the user supplied the file args as arguments to pax */ if (ftcur == NULL) ftcur = fthead; else if ((ftcur = ftcur->fow) == NULL) return(-1); if (ftcur->chflg) { /* First fchdir() back... */ if (fchdir(cwdfd) < 0) { syswarn(1, errno, "Can't fchdir to starting directory"); return(-1); } if (chdir(ftcur->fname) < 0) { syswarn(1, errno, "Can't chdir to %s", ftcur->fname); return(-1); } continue; } else farray[0] = ftcur->fname; } /* * Watch it, fts wants the file arg stored in an array of char * ptrs, with the last one a null. We use a two element array * and set farray[0] to point at the buffer with the file name * in it. We cannot pass all the file args to fts at one shot * as we need to keep a handle on which file arg generates what * files (the -n and -d flags need this). If the open is * successful, return a 0. */ if ((ftsp = fts_open(farray, ftsopts, NULL)) != NULL) break; } return(0); } /* * next_file() * supplies the next file to process in the supplied archd structure. * Return: * 0 when contents of arcn have been set with the next file, -1 when done. */ int next_file(ARCHD *arcn) { int cnt; time_t atime; time_t mtime; /* * ftree_sel() might have set the ftree_skip flag if the user has the * -n option and a file was selected from this file arg tree. (-n says * only one member is matched for each pattern) ftree_skip being 1 * forces us to go to the next arg now. */ if (ftree_skip) { /* * clear and go to next arg */ ftree_skip = 0; if (ftree_arg() < 0) return(-1); } /* * loop until we get a valid file to process */ for(;;) { if ((ftent = fts_read(ftsp)) == NULL) { /* * out of files in this tree, go to next arg, if none * we are done */ if (ftree_arg() < 0) return(-1); continue; } /* * handle each type of fts_read() flag */ switch(ftent->fts_info) { case FTS_D: case FTS_DEFAULT: case FTS_F: case FTS_SL: case FTS_SLNONE: /* * these are all ok */ break; case FTS_DP: /* * already saw this directory. If the user wants file * access times reset, we use this to restore the * access time for this directory since this is the * last time we will see it in this file subtree * remember to force the time (this is -t on a read * directory, not a created directory). */ # ifdef NET2_FTS if (!tflag || (get_atdir(ftent->fts_statb.st_dev, ftent->fts_statb.st_ino, &mtime, &atime) < 0)) # else if (!tflag || (get_atdir(ftent->fts_statp->st_dev, ftent->fts_statp->st_ino, &mtime, &atime) < 0)) # endif continue; set_ftime(ftent->fts_path, mtime, atime, 1); continue; case FTS_DC: /* * fts claims a file system cycle */ paxwarn(1,"File system cycle found at %s",ftent->fts_path); continue; case FTS_DNR: # ifdef NET2_FTS syswarn(1, errno, # else syswarn(1, ftent->fts_errno, # endif "Unable to read directory %s", ftent->fts_path); continue; case FTS_ERR: # ifdef NET2_FTS syswarn(1, errno, # else syswarn(1, ftent->fts_errno, # endif "File system traversal error"); continue; case FTS_NS: case FTS_NSOK: # ifdef NET2_FTS syswarn(1, errno, # else syswarn(1, ftent->fts_errno, # endif "Unable to access %s", ftent->fts_path); continue; } /* * ok got a file tree node to process. copy info into arcn * structure (initialize as required) */ arcn->skip = 0; arcn->pad = 0; arcn->ln_nlen = 0; arcn->ln_name[0] = '\0'; # ifdef NET2_FTS arcn->sb = ftent->fts_statb; # else arcn->sb = *(ftent->fts_statp); # endif /* * file type based set up and copy into the arcn struct * SIDE NOTE: * we try to reset the access time on all files and directories * we may read when the -t flag is specified. files are reset * when we close them after copying. we reset the directories * when we are done with their file tree (we also clean up at * end in case we cut short a file tree traversal). However * there is no way to reset access times on symlinks. */ switch(S_IFMT & arcn->sb.st_mode) { case S_IFDIR: arcn->type = PAX_DIR; if (!tflag) break; add_atdir(ftent->fts_path, arcn->sb.st_dev, arcn->sb.st_ino, arcn->sb.st_mtime, arcn->sb.st_atime); break; case S_IFCHR: arcn->type = PAX_CHR; break; case S_IFBLK: arcn->type = PAX_BLK; break; case S_IFREG: /* * only regular files with have data to store on the * archive. all others will store a zero length skip. * the skip field is used by pax for actual data it has * to read (or skip over). */ arcn->type = PAX_REG; arcn->skip = arcn->sb.st_size; break; case S_IFLNK: arcn->type = PAX_SLK; /* * have to read the symlink path from the file */ if ((cnt = readlink(ftent->fts_path, arcn->ln_name, PAXPATHLEN - 1)) < 0) { syswarn(1, errno, "Unable to read symlink %s", ftent->fts_path); continue; } /* * set link name length, watch out readlink does not * always NUL terminate the link path */ arcn->ln_name[cnt] = '\0'; arcn->ln_nlen = cnt; break; case S_IFSOCK: /* * under BSD storing a socket is senseless but we will * let the format specific write function make the * decision of what to do with it. */ arcn->type = PAX_SCK; break; case S_IFIFO: arcn->type = PAX_FIF; break; } break; } /* * copy file name, set file name length */ arcn->nlen = l_strncpy(arcn->name, ftent->fts_path, sizeof(arcn->name) - 1); arcn->name[arcn->nlen] = '\0'; arcn->org_name = ftent->fts_path; return(0); }
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