freebsd-dev/bin/sh/cd.c

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/*-
* 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.
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*
* $Id: cd.c,v 1.15 1997/04/28 03:06:32 steve Exp $
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*/
#ifndef lint
static char const sccsid[] = "@(#)cd.c 8.2 (Berkeley) 5/4/95";
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#endif /* not lint */
#include <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
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/*
* 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"
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#include "mystring.h"
#include "show.h"
#include "cd.h"
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STATIC int docd __P((char *, int));
STATIC char *getcomponent __P((void));
STATIC void updatepwd __P((char *));
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char *curdir = NULL; /* current working directory */
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char *prevdir; /* previous working directory */
STATIC char *cdcomppath;
int
cdcmd(argc, argv)
int argc __unused;
char **argv __unused;
{
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char *dest;
char *path;
char *p;
struct stat statb;
int print = 0;
nextopt(nullstr);
if ((dest = *argptr) == NULL && (dest = bltinlookup("HOME", 1)) == NULL)
error("HOME not set");
if (*dest == '\0')
dest = ".";
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if (dest[0] == '-' && dest[1] == '\0') {
dest = prevdir ? prevdir : curdir;
if (dest)
print = 1;
else
dest = ".";
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}
if (*dest == '/' || (path = bltinlookup("CDPATH", 1)) == NULL)
path = nullstr;
while ((p = padvance(&path, dest)) != NULL) {
if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
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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);
/*NOTREACHED*/
return 0;
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}
/*
* Actually do the chdir. In an interactive shell, print the
* directory name if "print" is nonzero.
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*/
STATIC int
docd(dest, print)
char *dest;
int print;
{
TRACE(("docd(\"%s\", %d) called\n", dest, print));
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INTOFF;
updatepwd(dest);
if (chdir(stackblock()) < 0) {
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INTON;
return -1;
}
hashcd(); /* update command hash table */
if (prevdir)
ckfree(prevdir);
prevdir = curdir;
curdir = savestr(stackblock());
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INTON;
if (print && iflag)
out1fmt("%s\n", stackblock());
return 0;
}
/*
* Get the next component of the path name pointed to by cdcomppath.
* This routine overwrites the string pointed to by cdcomppath.
*/
STATIC char *
getcomponent()
{
char *p;
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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;
}
/*
* Determine the new working directory, but don't actually enforce
* any changes.
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*/
STATIC void
updatepwd(dir)
char *dir;
{
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char *new;
char *p;
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);
}
int
pwdcmd(argc, argv)
int argc __unused;
char **argv __unused;
{
if (!getpwd())
error("getcwd() failed: %s", strerror(errno));
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out1str(curdir);
out1c('\n');
return 0;
}
/*
* Find out what the current directory is. If we already know the current
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* directory, this routine returns immediately.
*/
char *
getpwd()
{
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if (curdir)
return (curdir);
return ((curdir = getcwd(NULL, 0)));
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}