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sh.dir.c
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/* $Header: /p/tcsh/cvsroot/tcsh/sh.dir.c,v 3.79 2006/09/25 18:17:26 christos Exp $ */
/*
* sh.dir.c: Directory manipulation functions
*/
/*-
* Copyright (c) 1980, 1991 The Regents of the University of California.
* 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.
* 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.
*/
#include "sh.h"
#include "ed.h"
RCSID("$tcsh: sh.dir.c,v 3.79 2006/09/25 18:17:26 christos Exp $")
/*
* C Shell - directory management
*/
static Char *agetcwd (void);
static void dstart (const char *);
static struct directory *dfind (Char *);
static Char *dfollow (Char *);
static void printdirs (int);
static Char *dgoto (Char *);
static void dnewcwd (struct directory *, int);
static void dset (Char *);
static void dextract (struct directory *);
static int skipargs (Char ***, const char *,
const char *);
static void dgetstack (void);
static struct directory dhead INIT_ZERO_STRUCT; /* "head" of loop */
static int printd; /* force name to be printed */
int bequiet = 0; /* do not print dir stack -strike */
static Char *
agetcwd(void)
{
char *buf;
Char *cwd;
size_t len;
len = MAXPATHLEN;
buf = xmalloc(len);
while (getcwd(buf, len) == NULL) {
int err;
err = errno;
if (err != ERANGE) {
xfree(buf);
errno = err;
return NULL;
}
len *= 2;
buf = xrealloc(buf, len);
}
if (*buf == '\0') {
xfree(buf);
return NULL;
}
cwd = SAVE(buf);
xfree(buf);
return cwd;
}
static void
dstart(const char *from)
{
xprintf(CGETS(12, 1, "%s: Trying to start from \"%s\"\n"), progname, from);
}
/*
* 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);
}
static void
dset(Char *dp)
{
/*
* Don't call set() directly cause if the directory contains ` or
* other junk characters glob will fail.
*/
setcopy(STRowd, varval(STRcwd), VAR_READWRITE|VAR_NOGLOB);
setcopy(STRcwd, dp, VAR_READWRITE|VAR_NOGLOB);
tsetenv(STRPWD, dp);
}
#define DIR_PRINT 0x01 /* -p */
#define DIR_LONG 0x02 /* -l */
#define DIR_VERT 0x04 /* -v */
#define DIR_LINE 0x08 /* -n */
#define DIR_SAVE 0x10 /* -S */
#define DIR_LOAD 0x20 /* -L */
#define DIR_CLEAR 0x40 /* -c */
#define DIR_OLD 0x80 /* - */
static int
skipargs(Char ***v, const char *dstr, const char *str)
{
Char **n = *v, *s;
int dflag = 0, loop = 1;
for (n++; loop && *n != NULL && (*n)[0] == '-'; n++)
if (*(s = &((*n)[1])) == '\0') /* test for bare "-" argument */
dflag |= DIR_OLD;
else {
char *p;
while (*s != '\0') /* examine flags */
{
if ((p = strchr(dstr, *s++)) != NULL)
dflag |= (1 << (p - dstr));
else
stderror(ERR_DIRUS, short2str(**v), dstr, str);
}
}
if (*n && (dflag & DIR_OLD))
stderror(ERR_DIRUS, short2str(**v), dstr, str);
*v = n;
/* make -l, -v, and -n imply -p */
if (dflag & (DIR_LONG|DIR_VERT|DIR_LINE))
dflag |= DIR_PRINT;
return dflag;
}
/*
* dodirs - list all directories in directory loop
*/
/*ARGSUSED*/
void
dodirs(Char **v, struct command *c)
{
static const char flags[] = "plvnSLc";
int dflag = skipargs(&v, flags, "");
USE(c);
if ((dflag & DIR_CLEAR) != 0) {
struct directory *dp, *fdp;
for (dp = dcwd->di_next; dp != dcwd; ) {
fdp = dp;
dp = dp->di_next;
if (fdp != &dhead)
dfree(fdp);
}
dhead.di_next = dhead.di_prev = dp;
dp->di_next = dp->di_prev = &dhead;
}
if ((dflag & DIR_LOAD) != 0)
loaddirs(*v);
else if ((dflag & DIR_SAVE) != 0)
recdirs(*v, 1);
if (*v && (dflag & (DIR_SAVE|DIR_LOAD)))
v++;
if (*v != NULL || (dflag & DIR_OLD))
stderror(ERR_DIRUS, "dirs", flags, "");
if ((dflag & (DIR_CLEAR|DIR_LOAD|DIR_SAVE)) == 0 || (dflag & DIR_PRINT))
printdirs(dflag);
}
static void
printdirs(int dflag)
{
struct directory *dp;
Char *s, *user;
int idx, len, cur;
dp = dcwd;
idx = 0;
cur = 0;
do {
if (dp == &dhead)
continue;
if (dflag & DIR_VERT) {
xprintf("%d\t", idx++);
cur = 0;
}
s = dp->di_name;
user = NULL;
if (!(dflag & DIR_LONG) && (user = getusername(&s)) != NULL)
len = (int) (Strlen(user) + Strlen(s) + 2);
else
len = (int) (Strlen(s) + 1);
cur += len;
if ((dflag & DIR_LINE) && cur >= TermH - 1 && len < TermH) {
xputchar('\n');
cur = len;
}
if (user)
xprintf("~%S", user);
xprintf("%-S%c", s, (dflag & DIR_VERT) ? '\n' : ' ');
} while ((dp = dp->di_prev) != dcwd);
if (!(dflag & DIR_VERT))
xputchar('\n');
}
void
dtildepr(Char *dir)
{
Char* user;
if ((user = getusername(&dir)) != NULL)
xprintf("~%-S%S", user, dir);
else
xprintf("%S", dir);
}
void
dtilde(void)
{
struct directory *d = dcwd;
do {
if (d == &dhead)
continue;
d->di_name = dcanon(d->di_name, STRNULL);
} while ((d = d->di_prev) != dcwd);
dset(dcwd->di_name);
}
/* dnormalize():
* The path will be normalized if it
* 1) is "..",
* 2) or starts with "../",
* 3) or ends with "/..",
* 4) or contains the string "/../",
* then it will be normalized, unless those strings are quoted.
* Otherwise, a copy is made and sent back.
*/
Char *
dnormalize(const Char *cp, int expnd)
{
/* return true if dp is of the form "../xxx" or "/../xxx" */
#define IS_DOTDOT(sp, p) (ISDOTDOT(p) && ((p) == (sp) || *((p) - 1) == '/'))
#define IS_DOT(sp, p) (ISDOT(p) && ((p) == (sp) || *((p) - 1) == '/'))
#ifdef S_IFLNK
if (expnd) {
struct Strbuf buf = Strbuf_INIT;
int dotdot = 0;
Char *dp, *cwd;
const Char *start = cp;
# ifdef HAVE_SLASHSLASH
int slashslash;
# endif /* HAVE_SLASHSLASH */
/*
* count the number of "../xxx" or "xxx/../xxx" in the path
*/
for ( ; *cp && *(cp + 1); cp++)
if (IS_DOTDOT(start, cp))
dotdot++;
/*
* if none, we are done.
*/
if (dotdot == 0)
return (Strsave(start));
# ifdef notdef
struct stat sb;
/*
* We disable this test because:
* cd /tmp; mkdir dir1 dir2; cd dir2; ln -s /tmp/dir1; cd dir1;
* echo ../../dir1 does not expand. We had enabled this before
* because it was bothering people with expansions in compilation
* lines like -I../../foo. Maybe we need some kind of finer grain
* control?
*
* If the path doesn't exist, we are done too.
*/
if (lstat(short2str(start), &sb) != 0 && errno == ENOENT)
return (Strsave(start));
# endif
cwd = xmalloc((Strlen(dcwd->di_name) + 3) * sizeof(Char));
(void) Strcpy(cwd, dcwd->di_name);
/*
* If the path starts with a slash, we are not relative to
* the current working directory.
*/
if (ABSOLUTEP(start))
*cwd = '\0';
# ifdef HAVE_SLASHSLASH
slashslash = cwd[0] == '/' && cwd[1] == '/';
# endif /* HAVE_SLASHSLASH */
/*
* Ignore . and count ..'s
*/
cp = start;
do {
dotdot = 0;
buf.len = 0;
while (*cp)
if (IS_DOT(start, cp)) {
if (*++cp)
cp++;
}
else if (IS_DOTDOT(start, cp)) {
if (buf.len != 0)
break; /* finish analyzing .././../xxx/[..] */
dotdot++;
cp += 2;
if (*cp)
cp++;
}
else
Strbuf_append1(&buf, *cp++);
Strbuf_terminate(&buf);
while (dotdot > 0)
if ((dp = Strrchr(cwd, '/')) != NULL) {
# ifdef HAVE_SLASHSLASH
if (dp == &cwd[1])
slashslash = 1;
# endif /* HAVE_SLASHSLASH */
*dp = '\0';
dotdot--;
}
else
break;
if (!*cwd) { /* too many ..'s, starts with "/" */
cwd[0] = '/';
# ifdef HAVE_SLASHSLASH
/*
* Only append another slash, if already the former cwd
* was in a double-slash path.
*/
cwd[1] = slashslash ? '/' : '\0';
cwd[2] = '\0';
# else /* !HAVE_SLASHSLASH */
cwd[1] = '\0';
# endif /* HAVE_SLASHSLASH */
}
# ifdef HAVE_SLASHSLASH
else if (slashslash && cwd[1] == '\0') {
cwd[1] = '/';
cwd[2] = '\0';
}
# endif /* HAVE_SLASHSLASH */
if (buf.len != 0) {
size_t i;
i = Strlen(cwd);
if (TRM(cwd[i - 1]) != '/') {
cwd[i++] = '/';
cwd[i] = '\0';
}
dp = Strspl(cwd, TRM(buf.s[0]) == '/' ? &buf.s[1] : buf.s);
xfree(cwd);
cwd = dp;
i = Strlen(cwd) - 1;
if (TRM(cwd[i]) == '/')
cwd[i] = '\0';
}
/* Reduction of ".." following the stuff we collected in buf
* only makes sense if the directory item in buf really exists.
* Avoid reduction of "-I../.." (typical compiler call) to ""
* or "/usr/nonexistant/../bin" to "/usr/bin":
*/
if (cwd[0]) {
struct stat exists;
if (0 != stat(short2str(cwd), &exists)) {
xfree(buf.s);
xfree(cwd);
return Strsave(start);
}
}
} while (*cp != '\0');
xfree(buf.s);
return cwd;
}
#endif /* S_IFLNK */
return Strsave(cp);
}
/*
* dochngd - implement chdir command.
*/
/*ARGSUSED*/
void
dochngd(Char **v, struct command *c)
{
Char *cp;
struct directory *dp;
int dflag = skipargs(&v, "plvn", "[-|<dir>]");
USE(c);
printd = 0;
cp = (dflag & DIR_OLD) ? varval(STRowd) : *v;
if (cp == NULL) {
if ((cp = varval(STRhome)) == STRNULL || *cp == 0)
stderror(ERR_NAME | ERR_NOHOMEDIR);
if (chdir(short2str(cp)) < 0)
stderror(ERR_NAME | ERR_CANTCHANGE);
cp = Strsave(cp);
}
else if ((dflag & DIR_OLD) == 0 && v[1] != NULL) {
stderror(ERR_NAME | ERR_TOOMANY);
/* NOTREACHED */
return;
}
else if ((dp = dfind(cp)) != 0) {
char *tmp;
printd = 1;
if (chdir(tmp = short2str(dp->di_name)) < 0)
stderror(ERR_SYSTEM, tmp, strerror(errno));
dcwd->di_prev->di_next = dcwd->di_next;
dcwd->di_next->di_prev = dcwd->di_prev;
dfree(dcwd);
dnewcwd(dp, dflag);
return;
}
else
if ((cp = dfollow(cp)) == NULL)
return;
dp = xcalloc(sizeof(struct directory), 1);
dp->di_name = cp;
dp->di_count = 0;
dp->di_next = dcwd->di_next;
dp->di_prev = dcwd->di_prev;
dp->di_prev->di_next = dp;
dp->di_next->di_prev = dp;
dfree(dcwd);
dnewcwd(dp, dflag);
}
static Char *
dgoto(Char *cp)
{
Char *dp, *ret;
if (!ABSOLUTEP(cp))
{
Char *p, *q;
size_t cwdlen;
cwdlen = Strlen(dcwd->di_name);
if (cwdlen == 1) /* root */
cwdlen = 0;
dp = xmalloc((cwdlen + Strlen(cp) + 2) * sizeof(Char));
for (p = dp, q = dcwd->di_name; (*p++ = *q++) != '\0';)
continue;
if (cwdlen)
p[-1] = '/';
else
p--; /* don't add a / after root */
Strcpy(p, cp);
xfree(cp);
cp = dp;
dp += cwdlen;
}
else
dp = cp;
#if defined(WINNT_NATIVE)
return agetcwd();
#elif defined(__CYGWIN__)
if (ABSOLUTEP(cp) && cp[1] == ':') { /* Only DOS paths are treated that way */
return agetcwd();
} else {
cleanup_push(cp, xfree);
ret = dcanon(cp, dp);
cleanup_ignore(cp);
cleanup_until(cp);
}
#else /* !WINNT_NATIVE */
cleanup_push(cp, xfree);
ret = dcanon(cp, dp);
cleanup_ignore(cp);
cleanup_until(cp);
#endif /* WINNT_NATIVE */
return ret;
}
/*
* dfollow - change to arg directory; fall back on cdpath if not valid
*/
static Char *
dfollow(Char *cp)
{
Char *dp;
struct varent *c;
int serrno;
cp = globone(cp, G_ERROR);
cleanup_push(cp, xfree);
#ifdef apollo
if (Strchr(cp, '`')) {
char *dptr;
if (chdir(dptr = short2str(cp)) < 0)
stderror(ERR_SYSTEM, dptr, strerror(errno));
dp = agetcwd();
cleanup_push(dp, xfree);
if (dp != NULL) {
cleanup_until(cp);
return dgoto(dp);
}
else
stderror(ERR_SYSTEM, dptr, strerror(errno));
}
#endif /* apollo */
/*
* if we are ignoring symlinks, try to fix relatives now.
* if we are expading symlinks, it should be done by now.
*/
dp = dnormalize(cp, symlinks == SYM_IGNORE);
if (chdir(short2str(dp)) >= 0) {
cleanup_until(cp);
return dgoto(dp);
}
else {
xfree(dp);
if (chdir(short2str(cp)) >= 0) {
cleanup_ignore(cp);
cleanup_until(cp);
return dgoto(cp);
}
else if (errno != ENOENT && errno != ENOTDIR) {
int err;
err = errno;
stderror(ERR_SYSTEM, short2str(cp), strerror(err));
}
serrno = errno;
}
if (cp[0] != '/' && !prefix(STRdotsl, cp) && !prefix(STRdotdotsl, cp)
&& (c = adrof(STRcdpath)) && c->vec != NULL) {
struct Strbuf buf = Strbuf_INIT;
Char **cdp;
for (cdp = c->vec; *cdp; cdp++) {
buf.len = 0;
Strbuf_append(&buf, *cdp);
Strbuf_append1(&buf, '/');
Strbuf_append(&buf, cp);
Strbuf_terminate(&buf);
/*
* We always want to fix the directory here
* If we are normalizing symlinks
*/
dp = dnormalize(buf.s, symlinks == SYM_IGNORE ||
symlinks == SYM_EXPAND);
if (chdir(short2str(dp)) >= 0) {
printd = 1;
xfree(buf.s);
cleanup_until(cp);
return dgoto(dp);
}
else if (chdir(short2str(cp)) >= 0) {
printd = 1;
xfree(dp);
xfree(buf.s);
cleanup_ignore(cp);
cleanup_until(cp);
return dgoto(cp);
}
}
xfree(buf.s);
}
dp = varval(cp);
if ((dp[0] == '/' || dp[0] == '.') && chdir(short2str(dp)) >= 0) {
cleanup_until(cp);
cp = Strsave(dp);
printd = 1;
return dgoto(cp);
}
/*
* on login source of ~/.cshdirs, errors are eaten. the dir stack is all
* directories we could get to.
*/
if (!bequiet)
stderror(ERR_SYSTEM, short2str(cp), strerror(serrno));
cleanup_until(cp);
return (NULL);
}
/*
* dopushd - push new directory onto directory stack.
* with no arguments exchange top and second.
* with numeric argument (+n) bring it to top.
*/
/*ARGSUSED*/
void
dopushd(Char **v, struct command *c)
{
struct directory *dp;
Char *cp;
int dflag = skipargs(&v, "plvn", " [-|<dir>|+<n>]");
USE(c);
printd = 1;
cp = (dflag & DIR_OLD) ? varval(STRowd) : *v;
if (cp == NULL) {
if (adrof(STRpushdtohome)) {
if ((cp = varval(STRhome)) == STRNULL || *cp == 0)
stderror(ERR_NAME | ERR_NOHOMEDIR);
if (chdir(short2str(cp)) < 0)
stderror(ERR_NAME | ERR_CANTCHANGE);
if ((cp = dfollow(cp)) == NULL)
return;
dp = xcalloc(sizeof(struct directory), 1);
dp->di_name = cp;
dp->di_count = 0;
dp->di_prev = dcwd;
dp->di_next = dcwd->di_next;
dcwd->di_next = dp;
dp->di_next->di_prev = dp;
}
else {
char *tmp;
if ((dp = dcwd->di_prev) == &dhead)
dp = dhead.di_prev;
if (dp == dcwd)
stderror(ERR_NAME | ERR_NODIR);
if (chdir(tmp = short2str(dp->di_name)) < 0)
stderror(ERR_SYSTEM, tmp, strerror(errno));
dp->di_prev->di_next = dp->di_next;
dp->di_next->di_prev = dp->di_prev;
dp->di_next = dcwd->di_next;
dp->di_prev = dcwd;
dcwd->di_next->di_prev = dp;
dcwd->di_next = dp;
}
}
else if ((dflag & DIR_OLD) == 0 && v[1] != NULL) {
stderror(ERR_NAME | ERR_TOOMANY);
/* NOTREACHED */
return;
}
else if ((dp = dfind(cp)) != NULL) {
char *tmp;
if (chdir(tmp = short2str(dp->di_name)) < 0)
stderror(ERR_SYSTEM, tmp, strerror(errno));
/*
* kfk - 10 Feb 1984 - added new "extraction style" pushd +n
*/
if (adrof(STRdextract))
dextract(dp);
}
else {
Char *ccp;
if ((ccp = dfollow(cp)) == NULL)
return;
dp = xcalloc(sizeof(struct directory), 1);
dp->di_name = ccp;
dp->di_count = 0;
dp->di_prev = dcwd;
dp->di_next = dcwd->di_next;
dcwd->di_next = dp;
dp->di_next->di_prev = dp;
}
dnewcwd(dp, dflag);
}
/*
* dfind - find a directory if specified by numeric (+n) argument
*/
static struct directory *
dfind(Char *cp)
{
struct directory *dp;
int i;
Char *ep;
if (*cp++ != '+')
return (0);
for (ep = cp; Isdigit(*ep); ep++)
continue;
if (*ep)
return (0);
i = getn(cp);
if (i <= 0)
return (0);
for (dp = dcwd; i != 0; i--) {
if ((dp = dp->di_prev) == &dhead)
dp = dp->di_prev;
if (dp == dcwd)
stderror(ERR_NAME | ERR_DEEP);
}
return (dp);
}
/*
* dopopd - pop a directory out of the directory stack
* with a numeric argument just discard it.
*/
/*ARGSUSED*/
void
dopopd(Char **v, struct command *c)
{
Char *cp;
struct directory *dp, *p = NULL;
int dflag = skipargs(&v, "plvn", " [-|+<n>]");
USE(c);
printd = 1;
cp = (dflag & DIR_OLD) ? varval(STRowd) : *v;
if (cp == NULL)
dp = dcwd;
else if ((dflag & DIR_OLD) == 0 && v[1] != NULL) {
stderror(ERR_NAME | ERR_TOOMANY);
/* NOTREACHED */
return;
}
else if ((dp = dfind(cp)) == 0)
stderror(ERR_NAME | ERR_BADDIR);
if (dp->di_prev == &dhead && dp->di_next == &dhead)
stderror(ERR_NAME | ERR_EMPTY);
if (dp == dcwd) {
char *tmp;
if ((p = dp->di_prev) == &dhead)
p = dhead.di_prev;
if (chdir(tmp = short2str(p->di_name)) < 0)
stderror(ERR_SYSTEM, tmp, strerror(errno));
}
dp->di_prev->di_next = dp->di_next;
dp->di_next->di_prev = dp->di_prev;
dfree(dp);
if (dp == dcwd) {
dnewcwd(p, dflag);
}
else {
printdirs(dflag);
}
}
/*
* dfree - free the directory (or keep it if it still has ref count)
*/
void
dfree(struct directory *dp)
{
if (dp->di_count != 0) {
dp->di_next = dp->di_prev = 0;
}
else {
xfree(dp->di_name);
xfree(dp);
}
}
/*
* 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;