blob: 89c6c30c09153afb2c8652a2bcf1d206d023cb79 [file] [log] [blame]
/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1997-2005
* Herbert Xu <herbert@gondor.apana.org.au>. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Kenneth Almquist.
*
* 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 <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
/*
* The cd and pwd commands.
*/
#include "shell.h"
#include "var.h"
#include "nodes.h" /* for jobs.h */
#include "jobs.h"
#include "options.h"
#include "output.h"
#include "memalloc.h"
#include "error.h"
#include "exec.h"
#include "redir.h"
#include "main.h"
#include "mystring.h"
#include "show.h"
#include "cd.h"
#define CD_PHYSICAL 1
#define CD_PRINT 2
STATIC int docd(const char *, int);
STATIC const char *updatepwd(const char *);
STATIC char *getpwd(void);
STATIC int cdopt(void);
STATIC char *curdir = nullstr; /* current working directory */
STATIC char *physdir = nullstr; /* physical working directory */
STATIC int
cdopt()
{
int flags = 0;
int i, j;
j = 'L';
while ((i = nextopt("LP"))) {
if (i != j) {
flags ^= CD_PHYSICAL;
j = i;
}
}
return flags;
}
int
cdcmd(int argc, char **argv)
{
const char *dest;
const char *path;
const char *p;
char c;
struct stat statb;
int flags;
flags = cdopt();
dest = *argptr;
if (!dest)
dest = bltinlookup(homestr);
else if (dest[0] == '-' && dest[1] == '\0') {
dest = bltinlookup("OLDPWD");
flags |= CD_PRINT;
}
if (!dest)
dest = nullstr;
if (*dest == '/')
goto step6;
if (*dest == '.') {
c = dest[1];
dotdot:
switch (c) {
case '\0':
case '/':
goto step6;
case '.':
c = dest[2];
if (c != '.')
goto dotdot;
}
}
if (!*dest)
dest = ".";
path = bltinlookup("CDPATH");
while (path) {
c = *path;
p = padvance(&path, dest);
if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
if (c && c != ':')
flags |= CD_PRINT;
docd:
if (!docd(p, flags))
goto out;
goto err;
}
}
step6:
p = dest;
goto docd;
err:
sh_error("can't cd to %s", dest);
/* NOTREACHED */
out:
if (flags & CD_PRINT)
out1fmt(snlfmt, curdir);
return 0;
}
/*
* Actually do the chdir. We also call hashcd to let the routines in exec.c
* know that the current directory has changed.
*/
STATIC int
docd(const char *dest, int flags)
{
const char *dir = 0;
int err;
TRACE(("docd(\"%s\", %d) called\n", dest, flags));
INTOFF;
if (!(flags & CD_PHYSICAL)) {
dir = updatepwd(dest);
if (dir)
dest = dir;
}
err = chdir(dest);
if (err)
goto out;
setpwd(dir, 1);
hashcd();
out:
INTON;
return err;
}
/*
* Update curdir (the name of the current directory) in response to a
* cd command.
*/
STATIC const char *
updatepwd(const char *dir)
{
char *new;
char *p;
char *cdcomppath;
const char *lim;
cdcomppath = sstrdup(dir);
STARTSTACKSTR(new);
if (*dir != '/') {
if (curdir == nullstr)
return 0;
new = stputs(curdir, new);
}
new = makestrspace(strlen(dir) + 2, new);
lim = stackblock() + 1;
if (*dir != '/') {
if (new[-1] != '/')
USTPUTC('/', new);
if (new > lim && *lim == '/')
lim++;
} else {
USTPUTC('/', new);
cdcomppath++;
if (dir[1] == '/' && dir[2] != '/') {
USTPUTC('/', new);
cdcomppath++;
lim++;
}
}
p = strtok(cdcomppath, "/");
while (p) {
switch(*p) {
case '.':
if (p[1] == '.' && p[2] == '\0') {
while (new > lim) {
STUNPUTC(new);
if (new[-1] == '/')
break;
}
break;
} else if (p[1] == '\0')
break;
/* fall through */
default:
new = stputs(p, new);
USTPUTC('/', new);
}
p = strtok(0, "/");
}
if (new > lim)
STUNPUTC(new);
*new = 0;
return stackblock();
}
/*
* Find out what the current directory is. If we already know the current
* directory, this routine returns immediately.
*/
inline
STATIC char *
getpwd()
{
#ifdef __GLIBC__
char *dir = getcwd(0, 0);
if (dir)
return dir;
#else
char buf[PATH_MAX];
if(getcwd(buf, sizeof(buf)))
return savestr(buf);
#endif
sh_warnx("getcwd() failed: %s", strerror(errno));
return nullstr;
}
int
pwdcmd(int argc, char **argv)
{
int flags;
const char *dir = curdir;
flags = cdopt();
if (flags) {
if (physdir == nullstr)
setpwd(dir, 0);
dir = physdir;
}
out1fmt(snlfmt, dir);
return 0;
}
void
setpwd(const char *val, int setold)
{
char *oldcur, *dir;
oldcur = dir = curdir;
if (setold) {
setvar("OLDPWD", oldcur, VEXPORT);
}
INTOFF;
if (physdir != nullstr) {
if (physdir != oldcur)
free(physdir);
physdir = nullstr;
}
if (oldcur == val || !val) {
char *s = getpwd();
physdir = s;
if (!val)
dir = s;
} else
dir = savestr(val);
if (oldcur != dir && oldcur != nullstr) {
free(oldcur);
}
curdir = dir;
INTON;
setvar("PWD", dir, VEXPORT);
}