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- /*
- Unix SMB/Netbios implementation.
- Version 1.9.
- Directory handling routines
- Copyright (C) Andrew Tridgell 1992-1998
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
- #include "includes.h"
-
- extern int DEBUGLEVEL;
- extern connection_struct Connections[];
-
- /*
- This module implements directory related functions for Samba.
- */
-
-
-
- uint32 dircounter = 0;
-
-
- #define NUMDIRPTRS 256
-
-
- static struct dptr_struct
- {
- int pid;
- int cnum;
- uint32 lastused;
- void *ptr;
- BOOL valid;
- BOOL finished;
- BOOL expect_close;
- char *wcard; /* Field only used for lanman2 trans2_findfirst/next searches */
- uint16 attr; /* Field only used for lanman2 trans2_findfirst/next searches */
- char *path;
- }
- dirptrs[NUMDIRPTRS];
-
-
- static int dptrs_open = 0;
-
- /****************************************************************************
- initialise the dir array
- ****************************************************************************/
- void init_dptrs(void)
- {
- static BOOL dptrs_init=False;
- int i;
-
- if (dptrs_init) return;
- for (i=0;i<NUMDIRPTRS;i++)
- {
- dirptrs[i].valid = False;
- dirptrs[i].wcard = NULL;
- dirptrs[i].ptr = NULL;
- string_init(&dirptrs[i].path,"");
- }
- dptrs_init = True;
- }
-
- /****************************************************************************
- idle a dptr - the directory is closed but the control info is kept
- ****************************************************************************/
- static void dptr_idle(int key)
- {
- if (dirptrs[key].valid && dirptrs[key].ptr) {
- DEBUG(4,("Idling dptr key %d\n",key));
- dptrs_open--;
- CloseDir(dirptrs[key].ptr);
- dirptrs[key].ptr = NULL;
- }
- }
-
- /****************************************************************************
- idle the oldest dptr
- ****************************************************************************/
- static void dptr_idleoldest(void)
- {
- int i;
- uint32 old=dircounter+1;
- int oldi= -1;
- for (i=0;i<NUMDIRPTRS;i++)
- if (dirptrs[i].valid && dirptrs[i].ptr && dirptrs[i].lastused < old) {
- old = dirptrs[i].lastused;
- oldi = i;
- }
- if (oldi != -1)
- dptr_idle(oldi);
- else
- DEBUG(0,("No dptrs available to idle??\n"));
- }
-
- /****************************************************************************
- get the dir ptr for a dir index
- ****************************************************************************/
- static void *dptr_get(int key,uint32 lastused)
- {
- struct dptr_struct *dp = &dirptrs[key];
-
- if (dp->valid) {
- if (lastused) dp->lastused = lastused;
- if (!dp->ptr) {
- if (dptrs_open >= MAXDIR)
- dptr_idleoldest();
- DEBUG(4,("Reopening dptr key %d\n",key));
- if ((dp->ptr = OpenDir(dp->cnum, dp->path, True)))
- dptrs_open++;
- }
- return(dp->ptr);
- }
- return(NULL);
- }
-
- /****************************************************************************
- get the dir path for a dir index
- ****************************************************************************/
- char *dptr_path(int key)
- {
- if (dirptrs[key].valid)
- return(dirptrs[key].path);
- return(NULL);
- }
-
- /****************************************************************************
- get the dir wcard for a dir index (lanman2 specific)
- ****************************************************************************/
- char *dptr_wcard(int key)
- {
- if (dirptrs[key].valid)
- return(dirptrs[key].wcard);
- return(NULL);
- }
-
- /****************************************************************************
- set the dir wcard for a dir index (lanman2 specific)
- Returns 0 on ok, 1 on fail.
- ****************************************************************************/
- BOOL dptr_set_wcard(int key, char *wcard)
- {
- if (dirptrs[key].valid) {
- dirptrs[key].wcard = wcard;
- return True;
- }
- return False;
- }
-
- /****************************************************************************
- set the dir attrib for a dir index (lanman2 specific)
- Returns 0 on ok, 1 on fail.
- ****************************************************************************/
- BOOL dptr_set_attr(int key, uint16 attr)
- {
- if (dirptrs[key].valid) {
- dirptrs[key].attr = attr;
- return True;
- }
- return False;
- }
-
- /****************************************************************************
- get the dir attrib for a dir index (lanman2 specific)
- ****************************************************************************/
- uint16 dptr_attr(int key)
- {
- if (dirptrs[key].valid)
- return(dirptrs[key].attr);
- return(0);
- }
-
- /****************************************************************************
- close a dptr
- ****************************************************************************/
- void dptr_close(int key)
- {
- /* OS/2 seems to use -1 to indicate "close all directories" */
- if (key == -1) {
- int i;
- for (i=0;i<NUMDIRPTRS;i++)
- dptr_close(i);
- return;
- }
-
- if (key < 0 || key >= NUMDIRPTRS) {
- DEBUG(3,("Invalid key %d given to dptr_close\n",key));
- return;
- }
-
- if (dirptrs[key].valid) {
- DEBUG(4,("closing dptr key %d\n",key));
- if (dirptrs[key].ptr) {
- CloseDir(dirptrs[key].ptr);
- dptrs_open--;
- }
- /* Lanman 2 specific code */
- if (dirptrs[key].wcard)
- free(dirptrs[key].wcard);
- dirptrs[key].valid = False;
- string_set(&dirptrs[key].path,"");
- }
- }
-
- /****************************************************************************
- close all dptrs for a cnum
- ****************************************************************************/
- void dptr_closecnum(int cnum)
- {
- int i;
- for (i=0;i<NUMDIRPTRS;i++)
- if (dirptrs[i].valid && dirptrs[i].cnum == cnum)
- dptr_close(i);
- }
-
- /****************************************************************************
- idle all dptrs for a cnum
- ****************************************************************************/
- void dptr_idlecnum(int cnum)
- {
- int i;
- for (i=0;i<NUMDIRPTRS;i++)
- if (dirptrs[i].valid && dirptrs[i].cnum == cnum && dirptrs[i].ptr)
- dptr_idle(i);
- }
-
- /****************************************************************************
- close a dptr that matches a given path, only if it matches the pid also
- ****************************************************************************/
- void dptr_closepath(char *path,int pid)
- {
- int i;
- for (i=0;i<NUMDIRPTRS;i++)
- if (dirptrs[i].valid && pid == dirptrs[i].pid &&
- strequal(dirptrs[i].path,path))
- dptr_close(i);
- }
-
- /****************************************************************************
- start a directory listing
- ****************************************************************************/
- static BOOL start_dir(int cnum,char *directory)
- {
- DEBUG(5,("start_dir cnum=%d dir=%s\n",cnum,directory));
-
- if (!check_name(directory,cnum))
- return(False);
-
- if (! *directory)
- directory = ".";
-
- Connections[cnum].dirptr = OpenDir(cnum, directory, True);
- if (Connections[cnum].dirptr) {
- dptrs_open++;
- string_set(&Connections[cnum].dirpath,directory);
- return(True);
- }
-
- return(False);
- }
-
-
- /****************************************************************************
- create a new dir ptr
- ****************************************************************************/
- int dptr_create(int cnum,char *path, BOOL expect_close,int pid)
- {
- int i;
- uint32 old;
- int oldi;
-
- if (!start_dir(cnum,path))
- return(-2); /* Code to say use a unix error return code. */
-
- if (dptrs_open >= MAXDIR)
- dptr_idleoldest();
-
- for (i=0;i<NUMDIRPTRS;i++)
- if (!dirptrs[i].valid)
- break;
- if (i == NUMDIRPTRS) i = -1;
-
-
- /* as a 2nd option, grab the oldest not marked for expect_close */
- if (i == -1) {
- old=dircounter+1;
- oldi= -1;
- for (i=0;i<NUMDIRPTRS;i++)
- if (!dirptrs[i].expect_close && dirptrs[i].lastused < old) {
- old = dirptrs[i].lastused;
- oldi = i;
- }
- i = oldi;
- }
-
- /* a 3rd option - grab the oldest one */
- if (i == -1) {
- old=dircounter+1;
- oldi= -1;
- for (i=0;i<NUMDIRPTRS;i++)
- if (dirptrs[i].lastused < old) {
- old = dirptrs[i].lastused;
- oldi = i;
- }
- i = oldi;
- }
-
- if (i == -1) {
- DEBUG(0,("Error - all dirptrs in use??\n"));
- return(-1);
- }
-
- if (dirptrs[i].valid)
- dptr_close(i);
-
- dirptrs[i].ptr = Connections[cnum].dirptr;
- string_set(&dirptrs[i].path,path);
- dirptrs[i].lastused = dircounter++;
- dirptrs[i].finished = False;
- dirptrs[i].cnum = cnum;
- dirptrs[i].pid = pid;
- dirptrs[i].expect_close = expect_close;
- dirptrs[i].wcard = NULL; /* Only used in lanman2 searches */
- dirptrs[i].attr = 0; /* Only used in lanman2 searches */
- dirptrs[i].valid = True;
-
- DEBUG(3,("creating new dirptr %d for path %s, expect_close = %d\n",
- i,path,expect_close));
-
- return(i);
- }
-
- #define DPTR_MASK ((uint32)(((uint32)1)<<31))
-
- /****************************************************************************
- fill the 5 byte server reserved dptr field
- ****************************************************************************/
- BOOL dptr_fill(char *buf1,unsigned int key)
- {
- unsigned char *buf = (unsigned char *)buf1;
- void *p = dptr_get(key,0);
- uint32 offset;
- if (!p) {
- DEBUG(1,("filling null dirptr %d\n",key));
- return(False);
- }
- offset = TellDir(p);
- DEBUG(6,("fill on key %d dirptr 0x%x now at %d\n",key,p,offset));
- buf[0] = key;
- SIVAL(buf,1,offset | DPTR_MASK);
- return(True);
- }
-
-
- /****************************************************************************
- return True is the offset is at zero
- ****************************************************************************/
- BOOL dptr_zero(char *buf)
- {
- return((IVAL(buf,1)&~DPTR_MASK) == 0);
- }
-
- /****************************************************************************
- fetch the dir ptr and seek it given the 5 byte server field
- ****************************************************************************/
- void *dptr_fetch(char *buf,int *num)
- {
- unsigned int key = *(unsigned char *)buf;
- void *p = dptr_get(key,dircounter++);
- uint32 offset;
- if (!p) {
- DEBUG(3,("fetched null dirptr %d\n",key));
- return(NULL);
- }
- *num = key;
- offset = IVAL(buf,1)&~DPTR_MASK;
- SeekDir(p,offset);
- DEBUG(3,("fetching dirptr %d for path %s at offset %d\n",
- key,dptr_path(key),offset));
- return(p);
- }
-
- /****************************************************************************
- fetch the dir ptr.
- ****************************************************************************/
- void *dptr_fetch_lanman2(int dptr_num)
- {
- void *p = dptr_get(dptr_num,dircounter++);
-
- if (!p) {
- DEBUG(3,("fetched null dirptr %d\n",dptr_num));
- return(NULL);
- }
- DEBUG(3,("fetching dirptr %d for path %s\n",dptr_num,dptr_path(dptr_num)));
- return(p);
- }
-
- /****************************************************************************
- check a filetype for being valid
- ****************************************************************************/
- BOOL dir_check_ftype(int cnum,int mode,struct stat *st,int dirtype)
- {
- if (((mode & ~dirtype) & (aHIDDEN | aSYSTEM | aDIR)) != 0)
- return False;
- return True;
- }
-
- /****************************************************************************
- get a directory entry
- ****************************************************************************/
- BOOL get_dir_entry(int cnum,char *mask,int dirtype,char *fname,int *size,int *mode,time_t *date,BOOL check_descend)
- {
- char *dname;
- BOOL found = False;
- struct stat sbuf;
- pstring path;
- pstring pathreal;
- BOOL isrootdir;
- pstring filename;
- BOOL matched;
- BOOL needslash;
-
- *path = *pathreal = *filename = 0;
-
- isrootdir = (strequal(Connections[cnum].dirpath,"./") ||
- strequal(Connections[cnum].dirpath,".") ||
- strequal(Connections[cnum].dirpath,"/"));
-
- needslash =
- ( Connections[cnum].dirpath[strlen(Connections[cnum].dirpath) -1] != '/');
-
- if (!Connections[cnum].dirptr)
- return(False);
-
- while (!found)
- {
- dname = ReadDirName(Connections[cnum].dirptr);
-
- DEBUG(6,("readdir on dirptr 0x%x now at offset %d\n",
- Connections[cnum].dirptr,TellDir(Connections[cnum].dirptr)));
-
- if (dname == NULL)
- return(False);
-
- matched = False;
-
- pstrcpy(filename,dname);
-
- if ((strcmp(filename,mask) == 0) ||
- (name_map_mangle(filename,True,SNUM(cnum)) &&
- mask_match(filename,mask,False,False)))
- {
- if (isrootdir && (strequal(filename,"..") || strequal(filename,".")))
- continue;
-
- pstrcpy(fname,filename);
- *path = 0;
- pstrcpy(path,Connections[cnum].dirpath);
- if(needslash)
- pstrcat(path,"/");
- pstrcpy(pathreal,path);
- pstrcat(path,fname);
- pstrcat(pathreal,dname);
- if (sys_stat(pathreal,&sbuf) != 0)
- {
- DEBUG(5,("Couldn't stat 1 [%s]\n",path));
- continue;
- }
-
- if (check_descend &&
- !strequal(fname,".") && !strequal(fname,".."))
- continue;
-
- *mode = dos_mode(cnum,pathreal,&sbuf);
-
- if (!dir_check_ftype(cnum,*mode,&sbuf,dirtype)) {
- DEBUG(5,("[%s] attribs didn't match %x\n",filename,dirtype));
- continue;
- }
-
- *size = sbuf.st_size;
- *date = sbuf.st_mtime;
-
- DEBUG(5,("get_dir_entry found %s fname=%s\n",pathreal,fname));
-
- found = True;
- }
- }
-
- return(found);
- }
-
-
-
- typedef struct
- {
- int pos;
- int numentries;
- int mallocsize;
- char *data;
- char *current;
- } Dir;
-
-
- /*******************************************************************
- open a directory
- ********************************************************************/
- void *OpenDir(int cnum, char *name, BOOL use_veto)
- {
- Dir *dirp;
- char *n;
- void *p = sys_opendir(name);
- int used=0;
-
- if (!p) return(NULL);
- dirp = (Dir *)malloc(sizeof(Dir));
- if (!dirp) {
- closedir(p);
- return(NULL);
- }
- dirp->pos = dirp->numentries = dirp->mallocsize = 0;
- dirp->data = dirp->current = NULL;
-
- while ((n = readdirname(p)))
- {
- int l = strlen(n)+1;
-
- /* If it's a vetoed file, pretend it doesn't even exist */
- if (use_veto && IS_VETO_PATH(cnum, n)) continue;
-
- if (used + l > dirp->mallocsize) {
- int s = MAX(used+l,used+2000);
- char *r;
- r = (char *)Realloc(dirp->data,s);
- if (!r) {
- DEBUG(0,("Out of memory in OpenDir\n"));
- break;
- }
- dirp->data = r;
- dirp->mallocsize = s;
- dirp->current = dirp->data;
- }
- pstrcpy(dirp->data+used,n);
- used += l;
- dirp->numentries++;
- }
-
- closedir(p);
- return((void *)dirp);
- }
-
-
- /*******************************************************************
- close a directory
- ********************************************************************/
- void CloseDir(void *p)
- {
- Dir *dirp = (Dir *)p;
- if (!dirp) return;
- if (dirp->data) free(dirp->data);
- free(dirp);
- }
-
- /*******************************************************************
- read from a directory
- ********************************************************************/
- char *ReadDirName(void *p)
- {
- char *ret;
- Dir *dirp = (Dir *)p;
-
- if (!dirp || !dirp->current || dirp->pos >= dirp->numentries) return(NULL);
-
- ret = dirp->current;
- dirp->current = skip_string(dirp->current,1);
- dirp->pos++;
-
- return(ret);
- }
-
-
- /*******************************************************************
- seek a dir
- ********************************************************************/
- BOOL SeekDir(void *p,int pos)
- {
- Dir *dirp = (Dir *)p;
-
- if (!dirp) return(False);
-
- if (pos < dirp->pos) {
- dirp->current = dirp->data;
- dirp->pos = 0;
- }
-
- while (dirp->pos < pos && ReadDirName(p)) ;
-
- return(dirp->pos == pos);
- }
-
- /*******************************************************************
- tell a dir position
- ********************************************************************/
- int TellDir(void *p)
- {
- Dir *dirp = (Dir *)p;
-
- if (!dirp) return(-1);
-
- return(dirp->pos);
- }
-
-
- /* -------------------------------------------------------------------------- **
- * This section manages a global directory cache.
- * (It should probably be split into a separate module. crh)
- * -------------------------------------------------------------------------- **
- */
-
- typedef struct
- {
- ubi_dlNode node;
- char *path;
- char *name;
- char *dname;
- int snum;
- } dir_cache_entry;
-
- static ubi_dlList dir_cache[1] = { { NULL, NULL, 0 } };
-
- void DirCacheAdd( char *path, char *name, char *dname, int snum )
- /* ------------------------------------------------------------------------ **
- * Add an entry to the directory cache.
- *
- * Input: path -
- * name -
- * dname -
- * snum -
- *
- * Output: None.
- *
- * ------------------------------------------------------------------------ **
- */
- {
- int pathlen;
- int namelen;
- dir_cache_entry *entry;
-
- /* Allocate the structure & string space in one go so that it can be freed
- * in one call to free().
- */
- pathlen = strlen( path ) +1; /* Bytes required to store path (with nul). */
- namelen = strlen( name ) +1; /* Bytes required to store name (with nul). */
- entry = (dir_cache_entry *)malloc( sizeof( dir_cache_entry )
- + pathlen
- + namelen
- + strlen( dname ) +1 );
- if( NULL == entry ) /* Not adding to the cache is not fatal, */
- return; /* so just return as if nothing happened. */
-
- /* Set pointers correctly and load values. */
- entry->path = pstrcpy( (char *)&entry[1], path);
- entry->name = pstrcpy( &(entry->path[pathlen]), name);
- entry->dname = pstrcpy( &(entry->name[namelen]), dname);
- entry->snum = snum;
-
- /* Add the new entry to the linked list. */
- (void)ubi_dlAddHead( dir_cache, entry );
- DEBUG( 4, ("Added dir cache entry %s %s -> %s\n", path, name, dname ) );
-
- /* Free excess cache entries. */
- while( DIRCACHESIZE < dir_cache->count )
- free( ubi_dlRemTail( dir_cache ) );
-
- } /* DirCacheAdd */
-
-
- char *DirCacheCheck( char *path, char *name, int snum )
- /* ------------------------------------------------------------------------ **
- * Search for an entry to the directory cache.
- *
- * Input: path -
- * name -
- * snum -
- *
- * Output: The dname string of the located entry, or NULL if the entry was
- * not found.
- *
- * Notes: This uses a linear search, which is is okay because of
- * the small size of the cache. Use a splay tree or hash
- * for large caches.
- *
- * ------------------------------------------------------------------------ **
- */
- {
- dir_cache_entry *entry;
-
- for( entry = (dir_cache_entry *)ubi_dlFirst( dir_cache );
- NULL != entry;
- entry = (dir_cache_entry *)ubi_dlNext( entry ) )
- {
- if( entry->snum == snum
- && 0 == strcmp( name, entry->name )
- && 0 == strcmp( path, entry->path ) )
- {
- DEBUG(4, ("Got dir cache hit on %s %s -> %s\n",path,name,entry->dname));
- return( entry->dname );
- }
- }
-
- return(NULL);
- } /* DirCacheCheck */
-
- void DirCacheFlush( int snum )
- /* ------------------------------------------------------------------------ **
- * Remove all cache entries which have an snum that matches the input.
- *
- * Input: snum -
- *
- * Output: None.
- *
- * ------------------------------------------------------------------------ **
- */
- {
- dir_cache_entry *entry;
- ubi_dlNodePtr next;
-
- for( entry = (dir_cache_entry *)ubi_dlFirst( dir_cache ); NULL != entry; )
- {
- next = ubi_dlNext( entry );
- if( entry->snum == snum )
- free( ubi_dlRemThis( dir_cache, entry ) );
- entry = (dir_cache_entry *)next;
- }
- } /* DirCacheFlush */
-
- /* -------------------------------------------------------------------------- **
- * End of the section that manages the global directory cache.
- * -------------------------------------------------------------------------- **
- */
-
-
- #ifdef REPLACE_GETWD
- /* This is getcwd.c from bash. It is needed in Interactive UNIX. To
- * add support for another OS you need to determine which of the
- * conditional compilation macros you need to define. All the options
- * are defined for Interactive UNIX.
- */
- #ifdef ISC
- #define HAVE_UNISTD_H
- #define USGr3
- #define USG
- #endif
-
- #if defined (HAVE_UNISTD_H)
- # include <unistd.h>
- #endif
-
- #if defined (__STDC__)
- # define CONST const
- # define PTR void *
- #else /* !__STDC__ */
- # define CONST
- # define PTR char *
- #endif /* !__STDC__ */
-
- #if !defined (PATH_MAX)
- # if defined (MAXPATHLEN)
- # define PATH_MAX MAXPATHLEN
- # else /* !MAXPATHLEN */
- # define PATH_MAX 1024
- # endif /* !MAXPATHLEN */
- #endif /* !PATH_MAX */
-
- #if defined (_POSIX_VERSION) || defined (USGr3) || defined (HAVE_DIRENT_H)
- # if !defined (HAVE_DIRENT)
- # define HAVE_DIRENT
- # endif /* !HAVE_DIRENT */
- #endif /* _POSIX_VERSION || USGr3 || HAVE_DIRENT_H */
-
- #if defined (HAVE_DIRENT)
- # define D_NAMLEN(d) (strlen ((d)->d_name))
- #else
- # define D_NAMLEN(d) ((d)->d_namlen)
- #endif /* ! (_POSIX_VERSION || USGr3) */
-
- #if defined (USG) || defined (USGr3)
- # define d_fileno d_ino
- #endif
-
- #if !defined (alloca)
- extern char *alloca ();
- #endif /* alloca */
-
- /* Get the pathname of the current working directory,
- and put it in SIZE bytes of BUF. Returns NULL if the
- directory couldn't be determined or SIZE was too small.
- If successful, returns BUF. In GNU, if BUF is NULL,
- an array is allocated with `malloc'; the array is SIZE
- bytes long, unless SIZE <= 0, in which case it is as
- big as necessary. */
- #if defined (__STDC__)
- char *
- getcwd (char *buf, size_t size)
- #else /* !__STDC__ */
- char *
- getcwd (buf, size)
- char *buf;
- int size;
- #endif /* !__STDC__ */
- {
- static CONST char dots[]
- = "../../../../../../../../../../../../../../../../../../../../../../../\
- ../../../../../../../../../../../../../../../../../../../../../../../../../../\
- ../../../../../../../../../../../../../../../../../../../../../../../../../..";
- CONST char *dotp, *dotlist;
- size_t dotsize;
- dev_t rootdev, thisdev;
- ino_t rootino, thisino;
- char path[PATH_MAX + 1];
- register char *pathp;
- char *pathbuf;
- size_t pathsize;
- struct stat st;
-
- if (buf != NULL && size == 0)
- {
- errno = EINVAL;
- return ((char *)NULL);
- }
-
- pathsize = sizeof (path);
- pathp = &path[pathsize];
- *--pathp = '\0';
- pathbuf = path;
-
- if (stat (".", &st) < 0)
- return ((char *)NULL);
- thisdev = st.st_dev;
- thisino = st.st_ino;
-
- if (stat ("/", &st) < 0)
- return ((char *)NULL);
- rootdev = st.st_dev;
- rootino = st.st_ino;
-
- dotsize = sizeof (dots) - 1;
- dotp = &dots[sizeof (dots)];
- dotlist = dots;
- while (!(thisdev == rootdev && thisino == rootino))
- {
- register DIR *dirstream;
- register struct dirent *d;
- dev_t dotdev;
- ino_t dotino;
- char mount_point;
- int namlen;
-
- /* Look at the parent directory. */
- if (dotp == dotlist)
- {
- /* My, what a deep directory tree you have, Grandma. */
- char *new;
- if (dotlist == dots)
- {
- new = malloc (dotsize * 2 + 1);
- if (new == NULL)
- goto lose;
- memcpy (new, dots, dotsize);
- }
- else
- {
- new = realloc ((PTR) dotlist, dotsize * 2 + 1);
- if (new == NULL)
- goto lose;
- }
- memcpy (&new[dotsize], new, dotsize);
- dotp = &new[dotsize];
- dotsize *= 2;
- new[dotsize] = '\0';
- dotlist = new;
- }
-
- dotp -= 3;
-
- /* Figure out if this directory is a mount point. */
- if (stat (dotp, &st) < 0)
- goto lose;
- dotdev = st.st_dev;
- dotino = st.st_ino;
- mount_point = dotdev != thisdev;
-
- /* Search for the last directory. */
- dirstream = opendir(dotp);
- if (dirstream == NULL)
- goto lose;
- while ((d = (struct dirent *)readdir(dirstream)) != NULL)
- {
- if (d->d_name[0] == '.' &&
- (d->d_name[1] == '\0' ||
- (d->d_name[1] == '.' && d->d_name[2] == '\0')))
- continue;
- if (mount_point || d->d_fileno == thisino)
- {
- char *name;
-
- namlen = D_NAMLEN(d);
- name = (char *)
- alloca (dotlist + dotsize - dotp + 1 + namlen + 1);
- memcpy (name, dotp, dotlist + dotsize - dotp);
- name[dotlist + dotsize - dotp] = '/';
- memcpy (&name[dotlist + dotsize - dotp + 1],
- d->d_name, namlen + 1);
- if (lstat (name, &st) < 0)
- {
- int save = errno;
- closedir(dirstream);
- errno = save;
- goto lose;
- }
- if (st.st_dev == thisdev && st.st_ino == thisino)
- break;
- }
- }
- if (d == NULL)
- {
- int save = errno;
- closedir(dirstream);
- errno = save;
- goto lose;
- }
- else
- {
- size_t space;
-
- while ((space = pathp - pathbuf) <= namlen)
- {
- char *new;
-
- if (pathbuf == path)
- {
- new = malloc (pathsize * 2);
- if (!new)
- goto lose;
- }
- else
- {
- new = realloc ((PTR) pathbuf, (pathsize * 2));
- if (!new)
- goto lose;
- pathp = new + space;
- }
- (void) memcpy (new + pathsize + space, pathp, pathsize - space);
- pathp = new + pathsize + space;
- pathbuf = new;
- pathsize *= 2;
- }
-
- pathp -= namlen;
- (void) memcpy (pathp, d->d_name, namlen);
- *--pathp = '/';
- closedir(dirstream);
- }
-
- thisdev = dotdev;
- thisino = dotino;
- }
-
- if (pathp == &path[sizeof(path) - 1])
- *--pathp = '/';
-
- if (dotlist != dots)
- free ((PTR) dotlist);
-
- {
- size_t len = pathbuf + pathsize - pathp;
- if (buf == NULL)
- {
- if (len < (size_t) size)
- len = size;
- buf = (char *) malloc (len);
- if (buf == NULL)
- goto lose2;
- }
- else if ((size_t) size < len)
- {
- errno = ERANGE;
- goto lose2;
- }
- (void) memcpy((PTR) buf, (PTR) pathp, len);
- }
-
- if (pathbuf != path)
- free (pathbuf);
-
- return (buf);
-
- lose:
- if ((dotlist != dots) && dotlist)
- {
- int e = errno;
- free ((PTR) dotlist);
- errno = e;
- }
-
- lose2:
- if ((pathbuf != path) && pathbuf)
- {
- int e = errno;
- free ((PTR) pathbuf);
- errno = e;
- }
- return ((char *)NULL);
- }
- #endif
-