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238 lines
5.5 KiB
C
238 lines
5.5 KiB
C
/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: cd.c,v 1.15 1997/04/28 03:06:32 steve Exp $
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*/
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#ifndef lint
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static char const sccsid[] = "@(#)cd.c 8.2 (Berkeley) 5/4/95";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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/*
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* The cd and pwd commands.
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*/
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#include "shell.h"
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#include "var.h"
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#include "nodes.h" /* for jobs.h */
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#include "jobs.h"
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#include "options.h"
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#include "output.h"
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#include "memalloc.h"
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#include "error.h"
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#include "exec.h"
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#include "redir.h"
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#include "mystring.h"
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#include "show.h"
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#include "cd.h"
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STATIC int docd __P((char *, int));
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STATIC char *getcomponent __P((void));
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STATIC void updatepwd __P((char *));
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char *curdir = NULL; /* current working directory */
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char *prevdir; /* previous working directory */
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STATIC char *cdcomppath;
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int
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cdcmd(argc, argv)
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int argc __unused;
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char **argv __unused;
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{
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char *dest;
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char *path;
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char *p;
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struct stat statb;
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int print = 0;
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nextopt(nullstr);
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if ((dest = *argptr) == NULL && (dest = bltinlookup("HOME", 1)) == NULL)
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error("HOME not set");
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if (*dest == '\0')
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dest = ".";
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if (dest[0] == '-' && dest[1] == '\0') {
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dest = prevdir ? prevdir : curdir;
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if (dest)
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print = 1;
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else
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dest = ".";
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}
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if (*dest == '/' || (path = bltinlookup("CDPATH", 1)) == NULL)
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path = nullstr;
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while ((p = padvance(&path, dest)) != NULL) {
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if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
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if (!print) {
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/*
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* XXX - rethink
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*/
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if (p[0] == '.' && p[1] == '/')
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p += 2;
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print = strcmp(p, dest);
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}
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if (docd(p, print) >= 0)
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return 0;
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}
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}
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error("can't cd to %s", dest);
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/*NOTREACHED*/
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return 0;
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}
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/*
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* Actually do the chdir. In an interactive shell, print the
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* directory name if "print" is nonzero.
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*/
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STATIC int
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docd(dest, print)
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char *dest;
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int print;
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{
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TRACE(("docd(\"%s\", %d) called\n", dest, print));
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INTOFF;
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updatepwd(dest);
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if (chdir(stackblock()) < 0) {
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INTON;
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return -1;
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}
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hashcd(); /* update command hash table */
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if (prevdir)
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ckfree(prevdir);
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prevdir = curdir;
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curdir = savestr(stackblock());
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INTON;
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if (print && iflag)
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out1fmt("%s\n", stackblock());
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return 0;
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}
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/*
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* Get the next component of the path name pointed to by cdcomppath.
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* This routine overwrites the string pointed to by cdcomppath.
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*/
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STATIC char *
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getcomponent()
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{
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char *p;
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char *start;
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if ((p = cdcomppath) == NULL)
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return NULL;
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start = cdcomppath;
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while (*p != '/' && *p != '\0')
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p++;
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if (*p == '\0') {
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cdcomppath = NULL;
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} else {
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*p++ = '\0';
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cdcomppath = p;
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}
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return start;
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}
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/*
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* Determine the new working directory, but don't actually enforce
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* any changes.
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*/
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STATIC void
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updatepwd(dir)
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char *dir;
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{
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char *new;
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char *p;
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cdcomppath = stalloc(strlen(dir) + 1);
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scopy(dir, cdcomppath);
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STARTSTACKSTR(new);
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if (*dir != '/') {
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if (curdir == NULL)
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return;
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p = curdir;
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while (*p)
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STPUTC(*p++, new);
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if (p[-1] == '/')
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STUNPUTC(new);
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}
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while ((p = getcomponent()) != NULL) {
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if (equal(p, "..")) {
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while (new > stackblock() && (STUNPUTC(new), *new) != '/');
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} else if (*p != '\0' && ! equal(p, ".")) {
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STPUTC('/', new);
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while (*p)
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STPUTC(*p++, new);
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}
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}
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if (new == stackblock())
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STPUTC('/', new);
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STACKSTRNUL(new);
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}
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int
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pwdcmd(argc, argv)
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int argc __unused;
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char **argv __unused;
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{
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if (!getpwd())
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error("getcwd() failed: %s", strerror(errno));
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out1str(curdir);
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out1c('\n');
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return 0;
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}
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/*
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* Find out what the current directory is. If we already know the current
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* directory, this routine returns immediately.
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*/
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char *
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getpwd()
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{
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if (curdir)
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return (curdir);
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return ((curdir = getcwd(NULL, 0)));
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}
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