char *
getwd(char *pathname)
{
DIR *dp;
struct dirent *d;
extern int errno;
struct stat st_root, st_cur, st_next, st_dotdot;
char pathbuf[MAXPATHLEN], nextpathbuf[MAXPATHLEN * 2];
char *pathptr, *nextpathptr, *cur_name_add;
/* find the inode of root */
if (stat("/", &st_root) == -1) {
(void)sprintf(pathname,
"getwd: Cannot stat \"/\" (%s)", strerror(errno));
return (NULL);
}
pathbuf[MAXPATHLEN - 1] = '\0';
pathptr = &pathbuf[MAXPATHLEN - 1];
nextpathbuf[MAXPATHLEN - 1] = '\0';
cur_name_add = nextpathptr = &nextpathbuf[MAXPATHLEN - 1];
/* find the inode of the current directory */
if (lstat(".", &st_cur) == -1) {
(void)sprintf(pathname,
"getwd: Cannot stat \".\" (%s)", strerror(errno));
return (NULL);
}
nextpathptr = strrcpy(nextpathptr, "../");
/* Descend to root */
for (;;) {
/* look if we found root yet */
if (st_cur.st_ino == st_root.st_ino &&
DEV_DEV_COMPARE(st_cur.st_dev, st_root.st_dev)) {
(void)strcpy(pathname, *pathptr != '/' ? "/" : pathptr);
return (pathname);
}
/* open the parent directory */
if (stat(nextpathptr, &st_dotdot) == -1) {
(void)sprintf(pathname,
"getwd: Cannot stat directory \"%s\" (%s)",
nextpathptr, strerror(errno));
return (NULL);
}
if ((dp = opendir(nextpathptr)) == NULL) {
(void)sprintf(pathname,
"getwd: Cannot open directory \"%s\" (%s)",
nextpathptr, strerror(errno));
return (NULL);
}
/* look in the parent for the entry with the same inode */
if (DEV_DEV_COMPARE(st_dotdot.st_dev, st_cur.st_dev)) {
/* Parent has same device. No need to stat every member */
for (d = readdir(dp); d != NULL; d = readdir(dp))
if (d->d_fileno == st_cur.st_ino)
break;
}
else {
/*
* Parent has a different device. This is a mount point so we
* need to stat every member
*/
for (d = readdir(dp); d != NULL; d = readdir(dp)) {
if (ISDOT(d->d_name) || ISDOTDOT(d->d_name))
continue;
(void)strcpy(cur_name_add, d->d_name);
if (lstat(nextpathptr, &st_next) == -1) {
(void)sprintf(pathname,
"getwd: Cannot stat \"%s\" (%s)",
d->d_name, strerror(errno));
(void)closedir(dp);
return (NULL);
}
/* check if we found it yet */
if (st_next.st_ino == st_cur.st_ino &&
DEV_DEV_COMPARE(st_next.st_dev, st_cur.st_dev))
break;
}
}
if (d == NULL) {
(void)sprintf(pathname,
"getwd: Cannot find \".\" in \"..\"");
(void)closedir(dp);
return (NULL);
}
st_cur = st_dotdot;
pathptr = strrcpy(pathptr, d->d_name);
pathptr = strrcpy(pathptr, "/");
nextpathptr = strrcpy(nextpathptr, "../");
(void)closedir(dp);
*cur_name_add = '\0';
}
} /* end getwd */
/*
* dcanon - canonicalize the pathname, removing excess ./ and ../ etc.
* we are of course assuming that the file system is standardly
* constructed (always have ..'s, directories have links)
*/
Char *
dcanon(Char *cp, Char *p)
{
Char *sp;
Char *p1, *p2; /* general purpose */
int slash;
#ifdef HAVE_SLASHSLASH
int slashslash;
#endif /* HAVE_SLASHSLASH */
size_t clen;
#ifdef S_IFLNK /* if we have symlinks */
Char *mlink, *newcp;
char *tlink;
size_t cc;
#endif /* S_IFLNK */
clen = Strlen(cp);
/*
* christos: if the path given does not start with a slash prepend cwd. If
* cwd does not start with a slash or the result would be too long try to
* correct it.
*/
if (!ABSOLUTEP(cp)) {
Char *tmpdir;
size_t len;
p1 = varval(STRcwd);
if (p1 == STRNULL || !ABSOLUTEP(p1)) {
Char *new_cwd = agetcwd();
if (new_cwd == NULL) {
xprintf("%s: %s\n", progname, strerror(errno));
setcopy(STRcwd, str2short("/"), VAR_READWRITE|VAR_NOGLOB);
}
else
setv(STRcwd, new_cwd, VAR_READWRITE|VAR_NOGLOB);
p1 = varval(STRcwd);
}
len = Strlen(p1);
tmpdir = xmalloc((len + clen + 2) * sizeof (*tmpdir));
(void) Strcpy(tmpdir, p1);
(void) Strcat(tmpdir, STRslash);
(void) Strcat(tmpdir, cp);
xfree(cp);
cp = p = tmpdir;
}
#ifdef HAVE_SLASHSLASH
slashslash = (cp[0] == '/' && cp[1] == '/');
#endif /* HAVE_SLASHSLASH */
while (*p) { /* for each component */
sp = p; /* save slash address */
while (*++p == '/') /* flush extra slashes */
continue;
if (p != ++sp)
for (p1 = sp, p2 = p; (*p1++ = *p2++) != '\0';)
continue;
p = sp; /* save start of component */
slash = 0;
if (*p)
while (*++p) /* find next slash or end of path */
if (*p == '/') {
slash = 1;
*p = 0;
break;
}
#ifdef HAVE_SLASHSLASH
if (&cp[1] == sp && sp[0] == '.' && sp[1] == '.' && sp[2] == '\0')
slashslash = 1;
#endif /* HAVE_SLASHSLASH */
if (*sp == '\0') { /* if component is null */
if (--sp == cp) /* if path is one char (i.e. /) */
break;
else
*sp = '\0';
}
else if (sp[0] == '.' && sp[1] == 0) {
if (slash) {
for (p1 = sp, p2 = p + 1; (*p1++ = *p2++) != '\0';)
continue;
p = --sp;
}
else if (--sp != cp)
*sp = '\0';
else
sp[1] = '\0';
}
else if (sp[0] == '.' && sp[1] == '.' && sp[2] == 0) {
/*
* We have something like "yyy/xxx/..", where "yyy" can be null or
* a path starting at /, and "xxx" is a single component. Before
* compressing "xxx/..", we want to expand "yyy/xxx", if it is a
* symbolic link.
*/
*--sp = 0; /* form the pathname for readlink */
#ifdef S_IFLNK /* if we have symlinks */
if (sp != cp && /* symlinks != SYM_IGNORE && */
(tlink = areadlink(short2str(cp))) != NULL) {
mlink = str2short(tlink);
xfree(tlink);
if (slash)
*p = '/';
/*
* Point p to the '/' in "/..", and restore the '/'.
*/
*(p = sp) = '/';
if (*mlink != '/') {
/*
* Relative path, expand it between the "yyy/" and the
* "/..". First, back sp up to the character past "yyy/".
*/
while (*--sp != '/')
continue;
sp++;
*sp = 0;
/*
* New length is "yyy/" + mlink + "/.." and rest
*/
p1 = newcp = xmalloc(((sp - cp) + Strlen(mlink) +
Strlen(p) + 1) * sizeof(Char));
/*
* Copy new path into newcp
*/
for (p2 = cp; (*p1++ = *p2++) != '\0';)
continue;
for (p1--, p2 = mlink; (*p1++ = *p2++) != '\0';)
continue;
for (p1--, p2 = p; (*p1++ = *p2++) != '\0';)
continue;
/*
* Restart canonicalization at expanded "/xxx".
*/
p = sp - cp - 1 + newcp;
}
else {
newcp = Strspl(mlink, p);
/*
* Restart canonicalization at beginning
*/
p = newcp;
}
xfree(cp);
cp = newcp;
#ifdef HAVE_SLASHSLASH
slashslash = (cp[0] == '/' && cp[1] == '/');
#endif /* HAVE_SLASHSLASH */
continue; /* canonicalize the link */
}
#endif /* S_IFLNK */
*sp = '/';
if (sp != cp)
while (*--sp != '/')
continue;
if (slash) {
for (p1 = sp + 1, p2 = p + 1; (*p1++ = *p2++) != '\0';)
continue;
p = sp;
}
else if (cp == sp)
*++sp = '\0';
else
*sp = '\0';
}
else { /* normal dir name (not . or .. or nothing) */
#ifdef S_IFLNK /* if we have symlinks */
if (sp != cp && symlinks == SYM_CHASE &&
(tlink = areadlink(short2str(cp))) != NULL) {
mlink = str2short(tlink);
xfree(tlink);
/*
* restore the '/'.
*/
if (slash)
*p = '/';
/*
* point sp to p (rather than backing up).
*/
sp = p;
if (*mlink != '/') {
/*
* Relative path, expand it between the "yyy/" and the
* remainder. First, back sp up to the character past
* "yyy/".
*/
while (*--sp != '/')
continue;
sp++;
*sp = 0;
/*
* New length is "yyy/" + mlink + "/.." and rest
*/
p1 = newcp = xmalloc(((sp - cp) + Strlen(mlink) +
Strlen(p) + 1) * sizeof(Char));
/*
* Copy new path into newcp
*/
for (p2 = cp; (*p1++ = *p2++) != '\0';)
continue;
for (p1--, p2 = mlink; (*p1++ = *p2++) != '\0';)
continue;
for (p1--, p2 = p; (*p1++ = *p2++) != '\0';)
continue;
/*
* Restart canonicalization at expanded "/xxx".
*/
p = sp - cp - 1 + newcp;
}
else {
newcp = Strspl(mlink, p);
/*
* Restart canonicalization at beginning
*/
p = newcp;
}
xfree(cp);
cp = newcp;
#ifdef HAVE_SLASHSLASH
slashslash = (cp[0] == '/' && cp[1] == '/');
#endif /* HAVE_SLASHSLASH */
continue; /* canonicalize the mlink */
}
#endif /* S_IFLNK */
if (slash)
*p = '/';
}
}
/*
* fix home...
*/
#ifdef S_IFLNK
p1 = varval(STRhome);
cc = Strlen(p1);
/*
* See if we're not in a subdir of STRhome
*/
if (p1 && *p1 == '/' && (Strncmp(p1, cp, cc) != 0 ||
(cp[cc] != '/' && cp[cc] != '\0'))) {
static ino_t home_ino = (ino_t) -1;
static dev_t home_dev = (dev_t) -1;
static Char *home_ptr = NULL;
struct stat statbuf;
int found;
Char *copy;
/*
* Get dev and ino of STRhome
*/
if (home_ptr != p1 &&
stat(short2str(p1), &statbuf) != -1) {
home_dev = statbuf.st_dev;
home_ino = statbuf.st_ino;
home_ptr = p1;
}
/*
* Start comparing dev & ino backwards
*/
p2 = copy = Strsave(cp);
found = 0;
while (*p2 && stat(short2str(p2), &statbuf) != -1) {
if (DEV_DEV_COMPARE(statbuf.st_dev, home_dev) &&
statbuf.st_ino == home_ino) {
found = 1;
break;
}
if ((sp = Strrchr(p2, '/')) != NULL)
*sp = '\0';
}
/*
* See if we found it
*/
if (*p2 && found) {
/*
* Use STRhome to make '~' work
*/
newcp = Strspl(p1, cp + Strlen(p2));
xfree(cp);
cp = newcp;
}
xfree(copy);
}
#endif /* S_IFLNK */
#ifdef HAVE_SLASHSLASH
if (slashslash) {
if (cp[1] != '/') {
p = xmalloc((Strlen(cp) + 2) * sizeof(Char));
*p = '/';
(void) Strcpy(&p[1], cp);
xfree(cp);
cp = p;
}
}
if (cp[1] == '/' && cp[2] == '/') {
for (p1 = &cp[1], p2 = &cp[2]; (*p1++ = *p2++) != '\0';)
continue;
}
#endif /* HAVE_SLASHSLASH */
return cp;
}
/*
* dinit - initialize current working directory
*/
void
dinit(Char *hp)
{
Char *cp, *tcp;
struct directory *dp;
/* Don't believe the login shell home, because it may be a symlink */
tcp = agetcwd();
if (tcp == NULL) {
xprintf("%s: %s\n", progname, strerror(errno));
if (hp && *hp) {
char *xcp = short2str(hp);
dstart(xcp);
if (chdir(xcp) == -1)
cp = NULL;
else
cp = Strsave(hp);
}
else
cp = NULL;
if (cp == NULL) {
dstart("/");
if (chdir("/") == -1)
/* I am not even try to print an error message! */
xexit(1);
cp = SAVE("/");
}
}
else {
#ifdef S_IFLNK
struct stat swd, shp;
int swd_ok;
swd_ok = stat(short2str(tcp), &swd) == 0;
/*
* See if $HOME is the working directory we got and use that
*/
if (swd_ok && hp && *hp && stat(short2str(hp), &shp) != -1 &&
DEV_DEV_COMPARE(swd.st_dev, shp.st_dev) &&
swd.st_ino == shp.st_ino)
cp = Strsave(hp);
else {
char *cwd;
/*
* use PWD if we have it (for subshells)
*/
if (swd_ok && (cwd = getenv("PWD")) != NULL) {
if (stat(cwd, &shp) != -1 &&
DEV_DEV_COMPARE(swd.st_dev, shp.st_dev) &&
swd.st_ino == shp.st_ino) {
tcp = SAVE(cwd);
cleanup_push(tcp, xfree);
}
}
cleanup_push(tcp, xfree);
cp = dcanon(tcp, STRNULL);
cleanup_ignore(tcp);
cleanup_until(tcp);
}
#else /* S_IFLNK */
cleanup_push(tcp, xfree);
cp = dcanon(tcp, STRNULL);
cleanup_ignore(tcp);
cleanup_until(tcp);
#endif /* S_IFLNK */
}
dp = xcalloc(sizeof(struct directory), 1);
dp->di_name = cp;
dp->di_count = 0;
dhead.di_next = dhead.di_prev = dp;
dp->di_next = dp->di_prev = &dhead;
printd = 0;
dnewcwd(dp, 0);
setcopy(STRdirstack, dp->di_name, VAR_READWRITE|VAR_NOGLOB);
}
char *
xgetcwd(char *pathname, size_t pathlen)
{
DIR *dp;
struct dirent *d;
struct stat st_root, st_cur, st_next, st_dotdot;
char pathbuf[MAXPATHLEN], nextpathbuf[MAXPATHLEN * 2];
char *pathptr, *nextpathptr, *cur_name_add;
int save_errno = 0;
/* find the inode of root */
if (stat("/", &st_root) == -1) {
(void) xsnprintf(pathname, pathlen, CGETS(23, 23,
"getcwd: Cannot stat \"/\" (%s)"),
strerror(errno));
return NULL;
}
pathbuf[MAXPATHLEN - 1] = '\0';
pathptr = &pathbuf[MAXPATHLEN - 1];
nextpathbuf[MAXPATHLEN - 1] = '\0';
cur_name_add = nextpathptr = &nextpathbuf[MAXPATHLEN - 1];
/* find the inode of the current directory */
if (lstat(".", &st_cur) == -1) {
(void) xsnprintf(pathname, pathlen, CGETS(23, 24,
"getcwd: Cannot stat \".\" (%s)"),
strerror(errno));
return NULL;
}
nextpathptr = strnrcpy(nextpathptr, "../", nextpathptr - nextpathbuf);
/* Descend to root */
for (;;) {
/* look if we found root yet */
if (st_cur.st_ino == st_root.st_ino &&
DEV_DEV_COMPARE(st_cur.st_dev, st_root.st_dev)) {
(void) strncpy(pathname, *pathptr != '/' ? "/" : pathptr, pathlen);
pathname[pathlen - 1] = '\0';
return pathname;
}
/* open the parent directory */
if (stat(nextpathptr, &st_dotdot) == -1) {
(void) xsnprintf(pathname, pathlen, CGETS(23, 25,
"getcwd: Cannot stat directory \"%s\" (%s)"),
nextpathptr, strerror(errno));
return NULL;
}
if ((dp = opendir(nextpathptr)) == NULL) {
(void) xsnprintf(pathname, pathlen, CGETS(23, 26,
"getcwd: Cannot open directory \"%s\" (%s)"),
nextpathptr, strerror(errno));
return NULL;
}
/* look in the parent for the entry with the same inode */
if (DEV_DEV_COMPARE(st_dotdot.st_dev, st_cur.st_dev)) {
/* Parent has same device. No need to stat every member */
for (d = readdir(dp); d != NULL; d = readdir(dp)) {
#ifdef __clipper__
if (((unsigned long)d->d_ino & 0xffff) == st_cur.st_ino)
break;
#else
if (d->d_ino == st_cur.st_ino)
break;
#endif
}
}
else {
/*
* Parent has a different device. This is a mount point so we
* need to stat every member
*/
for (d = readdir(dp); d != NULL; d = readdir(dp)) {
if (ISDOT(d->d_name) || ISDOTDOT(d->d_name))
continue;
(void)strncpy(cur_name_add, d->d_name,
(size_t) (&nextpathbuf[sizeof(nextpathbuf) - 1] - cur_name_add));
if (lstat(nextpathptr, &st_next) == -1) {
/*
* We might not be able to stat() some path components
* if we are using afs, but this is not an error as
* long as we find the one we need; we also save the
* first error to report it if we don't finally succeed.
*/
if (save_errno == 0)
save_errno = errno;
continue;
}
/* check if we found it yet */
if (st_next.st_ino == st_cur.st_ino &&
DEV_DEV_COMPARE(st_next.st_dev, st_cur.st_dev))
break;
}
}
if (d == NULL) {
(void) xsnprintf(pathname, pathlen, CGETS(23, 27,
"getcwd: Cannot find \".\" in \"..\" (%s)"),
strerror(save_errno ? save_errno : ENOENT));
closedir(dp);
return NULL;
}
else
save_errno = 0;
st_cur = st_dotdot;
pathptr = strnrcpy(pathptr, d->d_name, pathptr - pathbuf);
pathptr = strnrcpy(pathptr, "/", pathptr - pathbuf);
nextpathptr = strnrcpy(nextpathptr, "../", nextpathptr - nextpathbuf);
*cur_name_add = '\0';
closedir(dp);
}
} /* end getcwd */
