382 lines
8.5 KiB
C
382 lines
8.5 KiB
C
/*-
|
|
* Copyright (c) 1991, 1993
|
|
* The Regents of the University of California. 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. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. 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.
|
|
*
|
|
* $Id: cd.c,v 1.3 1994/11/06 01:29:26 jkh Exp $
|
|
*/
|
|
|
|
#ifndef lint
|
|
static char sccsid[] = "@(#)cd.c 8.1 (Berkeley) 5/31/93";
|
|
#endif /* not lint */
|
|
|
|
/*
|
|
* 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 "mystring.h"
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/unistd.h>
|
|
#include <errno.h>
|
|
|
|
|
|
#ifdef __STDC__
|
|
STATIC int docd(char *, int);
|
|
STATIC void updatepwd(char *);
|
|
STATIC void getpwd(void);
|
|
STATIC char *getcomponent(void);
|
|
#else
|
|
STATIC int docd();
|
|
STATIC void updatepwd();
|
|
STATIC void getpwd();
|
|
STATIC char *getcomponent();
|
|
#endif
|
|
|
|
|
|
char *curdir; /* current working directory */
|
|
char *prevdir; /* previous working directory */
|
|
STATIC char *cdcomppath;
|
|
|
|
int
|
|
cdcmd(argc, argv) char **argv; {
|
|
char *dest;
|
|
char *path;
|
|
char *p;
|
|
struct stat statb;
|
|
char *padvance();
|
|
int print = 0;
|
|
|
|
nextopt(nullstr);
|
|
if ((dest = *argptr) == NULL && (dest = bltinlookup("HOME", 1)) == NULL)
|
|
error("HOME not set");
|
|
if (*dest == '\0')
|
|
dest = ".";
|
|
if (dest[0] == '-' && dest[1] == '\0') {
|
|
dest = prevdir ? prevdir : curdir;
|
|
print = 1;
|
|
}
|
|
if (*dest == '/' || (path = bltinlookup("CDPATH", 1)) == NULL)
|
|
path = nullstr;
|
|
while ((p = padvance(&path, dest)) != NULL) {
|
|
if (stat(p, &statb) >= 0
|
|
&& (statb.st_mode & S_IFMT) == S_IFDIR) {
|
|
if (!print) {
|
|
/*
|
|
* XXX - rethink
|
|
*/
|
|
if (p[0] == '.' && p[1] == '/')
|
|
p += 2;
|
|
print = strcmp(p, dest);
|
|
}
|
|
if (docd(p, print) >= 0)
|
|
return 0;
|
|
|
|
}
|
|
}
|
|
error("can't cd to %s", dest);
|
|
}
|
|
|
|
|
|
/*
|
|
* Actually do the chdir. If the name refers to symbolic links, we
|
|
* compute the actual directory name before doing the cd. In an
|
|
* interactive shell, print the directory name if "print" is nonzero
|
|
* or if the name refers to a symbolic link. We also print the name
|
|
* if "/u/logname" was expanded in it, since this is similar to a
|
|
* symbolic link. (The check for this breaks if the user gives the
|
|
* cd command some additional, unused arguments.)
|
|
*/
|
|
|
|
#if SYMLINKS == 0
|
|
STATIC int
|
|
docd(dest, print)
|
|
char *dest;
|
|
{
|
|
INTOFF;
|
|
if (chdir(dest) < 0) {
|
|
INTON;
|
|
return -1;
|
|
}
|
|
updatepwd(dest);
|
|
INTON;
|
|
if (print && iflag)
|
|
out1fmt("%s\n", stackblock());
|
|
return 0;
|
|
}
|
|
|
|
#else
|
|
|
|
|
|
|
|
STATIC int
|
|
docd(dest, print)
|
|
char *dest;
|
|
{
|
|
register char *p;
|
|
register char *q;
|
|
char *symlink;
|
|
char *component;
|
|
struct stat statb;
|
|
int first;
|
|
int i;
|
|
|
|
TRACE(("docd(\"%s\", %d) called\n", dest, print));
|
|
|
|
top:
|
|
cdcomppath = dest;
|
|
STARTSTACKSTR(p);
|
|
if (*dest == '/') {
|
|
STPUTC('/', p);
|
|
cdcomppath++;
|
|
}
|
|
first = 1;
|
|
while ((q = getcomponent()) != NULL) {
|
|
if (q[0] == '\0' || q[0] == '.' && q[1] == '\0')
|
|
continue;
|
|
if (! first)
|
|
STPUTC('/', p);
|
|
first = 0;
|
|
component = q;
|
|
while (*q)
|
|
STPUTC(*q++, p);
|
|
if (equal(component, ".."))
|
|
continue;
|
|
STACKSTRNUL(p);
|
|
if (lstat(stackblock(), &statb) < 0)
|
|
error("lstat %s failed", stackblock());
|
|
if ((statb.st_mode & S_IFMT) != S_IFLNK)
|
|
continue;
|
|
|
|
/* Hit a symbolic link. We have to start all over again. */
|
|
print = 1;
|
|
STPUTC('\0', p);
|
|
symlink = grabstackstr(p);
|
|
i = (int)statb.st_size + 2; /* 2 for '/' and '\0' */
|
|
if (cdcomppath != NULL)
|
|
i += strlen(cdcomppath);
|
|
p = stalloc(i);
|
|
if (readlink(symlink, p, (int)statb.st_size) < 0) {
|
|
error("readlink %s failed", stackblock());
|
|
}
|
|
if (cdcomppath != NULL) {
|
|
p[(int)statb.st_size] = '/';
|
|
scopy(cdcomppath, p + (int)statb.st_size + 1);
|
|
} else {
|
|
p[(int)statb.st_size] = '\0';
|
|
}
|
|
if (p[0] != '/') { /* relative path name */
|
|
char *r;
|
|
q = r = symlink;
|
|
while (*q) {
|
|
if (*q++ == '/')
|
|
r = q;
|
|
}
|
|
*r = '\0';
|
|
dest = stalloc(strlen(symlink) + strlen(p) + 1);
|
|
scopy(symlink, dest);
|
|
strcat(dest, p);
|
|
} else {
|
|
dest = p;
|
|
}
|
|
goto top;
|
|
}
|
|
STPUTC('\0', p);
|
|
p = grabstackstr(p);
|
|
INTOFF;
|
|
if (chdir(*p ? p : ".") < 0) {
|
|
INTON;
|
|
return -1;
|
|
}
|
|
updatepwd(p);
|
|
INTON;
|
|
if (print && iflag)
|
|
out1fmt("%s\n", p);
|
|
return 0;
|
|
}
|
|
#endif /* SYMLINKS */
|
|
|
|
|
|
|
|
/*
|
|
* Get the next component of the path name pointed to by cdcomppath.
|
|
* This routine overwrites the string pointed to by cdcomppath.
|
|
*/
|
|
|
|
STATIC char *
|
|
getcomponent() {
|
|
register char *p;
|
|
char *start;
|
|
|
|
if ((p = cdcomppath) == NULL)
|
|
return NULL;
|
|
start = cdcomppath;
|
|
while (*p != '/' && *p != '\0')
|
|
p++;
|
|
if (*p == '\0') {
|
|
cdcomppath = NULL;
|
|
} else {
|
|
*p++ = '\0';
|
|
cdcomppath = p;
|
|
}
|
|
return start;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Update curdir (the name of the current directory) in response to a
|
|
* cd command. We also call hashcd to let the routines in exec.c know
|
|
* that the current directory has changed.
|
|
*/
|
|
|
|
void hashcd();
|
|
|
|
STATIC void
|
|
updatepwd(dir)
|
|
char *dir;
|
|
{
|
|
char *new;
|
|
char *p;
|
|
|
|
hashcd(); /* update command hash table */
|
|
cdcomppath = stalloc(strlen(dir) + 1);
|
|
scopy(dir, cdcomppath);
|
|
STARTSTACKSTR(new);
|
|
if (*dir != '/') {
|
|
if (curdir == NULL)
|
|
return;
|
|
p = curdir;
|
|
while (*p)
|
|
STPUTC(*p++, new);
|
|
if (p[-1] == '/')
|
|
STUNPUTC(new);
|
|
}
|
|
while ((p = getcomponent()) != NULL) {
|
|
if (equal(p, "..")) {
|
|
while (new > stackblock() && (STUNPUTC(new), *new) != '/');
|
|
} else if (*p != '\0' && ! equal(p, ".")) {
|
|
STPUTC('/', new);
|
|
while (*p)
|
|
STPUTC(*p++, new);
|
|
}
|
|
}
|
|
if (new == stackblock())
|
|
STPUTC('/', new);
|
|
STACKSTRNUL(new);
|
|
INTOFF;
|
|
if (prevdir)
|
|
ckfree(prevdir);
|
|
prevdir = curdir;
|
|
curdir = savestr(stackblock());
|
|
INTON;
|
|
}
|
|
|
|
|
|
|
|
int
|
|
pwdcmd(argc, argv) char **argv; {
|
|
getpwd();
|
|
out1str(curdir);
|
|
out1c('\n');
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Run /bin/pwd to find out what the current directory is. We suppress
|
|
* interrupts throughout most of this, but the user can still break out
|
|
* of it by killing the pwd program. If we already know the current
|
|
* directory, this routine returns immediately.
|
|
*/
|
|
|
|
#define MAXPWD 256
|
|
|
|
STATIC void
|
|
getpwd() {
|
|
char buf[MAXPWD];
|
|
char *p;
|
|
int i;
|
|
int status;
|
|
struct job *jp;
|
|
int pip[2];
|
|
char *pwd_bin = "/bin/pwd";
|
|
|
|
if (curdir)
|
|
return;
|
|
INTOFF;
|
|
if (pipe(pip) < 0)
|
|
error("Pipe call failed");
|
|
/* make a fall-back guess, otherwise we're simply screwed */
|
|
if (access(pwd_bin, X_OK) == -1)
|
|
pwd_bin = "/stand/pwd";
|
|
jp = makejob((union node *)NULL, 1);
|
|
if (forkshell(jp, (union node *)NULL, FORK_NOJOB) == 0) {
|
|
close(pip[0]);
|
|
if (pip[1] != 1) {
|
|
close(1);
|
|
copyfd(pip[1], 1);
|
|
close(pip[1]);
|
|
}
|
|
execl(pwd_bin, "pwd", (char *)0);
|
|
error("Cannot exec %s", pwd_bin);
|
|
}
|
|
close(pip[1]);
|
|
pip[1] = -1;
|
|
p = buf;
|
|
while ((i = read(pip[0], p, buf + MAXPWD - p)) > 0
|
|
|| i == -1 && errno == EINTR) {
|
|
if (i > 0)
|
|
p += i;
|
|
}
|
|
close(pip[0]);
|
|
pip[0] = -1;
|
|
status = waitforjob(jp);
|
|
if (status != 0)
|
|
error((char *)0);
|
|
if (i < 0 || p == buf || p[-1] != '\n')
|
|
error("pwd command failed");
|
|
p[-1] = '\0';
|
|
curdir = savestr(buf);
|
|
INTON;
|
|
}
|