| 1 | /* $NetBSD: cd.c,v 1.34 2003/11/14 20:00:28 dsl Exp $ */
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| 2 |
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| 3 | /*-
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| 4 | * Copyright (c) 1991, 1993
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| 5 | * The Regents of the University of California. All rights reserved.
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| 6 | *
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| 7 | * This code is derived from software contributed to Berkeley by
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| 8 | * Kenneth Almquist.
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| 9 | *
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| 10 | * Redistribution and use in source and binary forms, with or without
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| 11 | * modification, are permitted provided that the following conditions
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| 12 | * are met:
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| 13 | * 1. Redistributions of source code must retain the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer.
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| 15 | * 2. Redistributions in binary form must reproduce the above copyright
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| 16 | * notice, this list of conditions and the following disclaimer in the
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| 17 | * documentation and/or other materials provided with the distribution.
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| 18 | * 3. Neither the name of the University nor the names of its contributors
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| 19 | * may be used to endorse or promote products derived from this software
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| 20 | * without specific prior written permission.
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| 21 | *
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| 22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 32 | * SUCH DAMAGE.
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| 33 | */
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| 34 |
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| 35 | #include <sys/cdefs.h>
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| 36 | #ifndef lint
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| 37 | #if 0
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| 38 | static char sccsid[] = "@(#)cd.c 8.2 (Berkeley) 5/4/95";
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| 39 | #else
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| 40 | __RCSID("$NetBSD: cd.c,v 1.34 2003/11/14 20:00:28 dsl Exp $");
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| 41 | #endif
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| 42 | #endif /* not lint */
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| 43 |
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| 44 | #include <sys/types.h>
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| 45 | #include <sys/stat.h>
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| 46 | #include <stdlib.h>
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| 47 | #include <string.h>
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| 48 | #include <unistd.h>
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| 49 | #include <errno.h>
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| 50 |
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| 51 | /*
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| 52 | * The cd and pwd commands.
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| 53 | */
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| 54 |
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| 55 | #include "shell.h"
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| 56 | #include "var.h"
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| 57 | #include "nodes.h" /* for jobs.h */
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| 58 | #include "jobs.h"
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| 59 | #include "options.h"
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| 60 | #include "output.h"
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| 61 | #include "memalloc.h"
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| 62 | #include "error.h"
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| 63 | #include "exec.h"
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| 64 | #include "redir.h"
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| 65 | #include "mystring.h"
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| 66 | #include "show.h"
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| 67 | #include "cd.h"
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| 68 |
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| 69 | STATIC int docd(char *, int);
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| 70 | STATIC char *getcomponent(void);
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| 71 | STATIC void updatepwd(char *);
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| 72 | STATIC void find_curdir(int noerror);
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| 73 |
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| 74 | char *curdir = NULL; /* current working directory */
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| 75 | char *prevdir; /* previous working directory */
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| 76 | STATIC char *cdcomppath;
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| 77 |
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| 78 | int
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| 79 | cdcmd(int argc, char **argv)
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| 80 | {
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| 81 | const char *dest;
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| 82 | const char *path;
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| 83 | char *p, *d;
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| 84 | struct stat statb;
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| 85 | int print = cdprint; /* set -cdprint to enable */
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| 86 |
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| 87 | nextopt(nullstr);
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| 88 |
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| 89 | /*
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| 90 | * Try (quite hard) to have 'curdir' defined, nothing has set
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| 91 | * it on entry to the shell, but we want 'cd fred; cd -' to work.
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| 92 | */
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| 93 | getpwd(1);
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| 94 | dest = *argptr;
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| 95 | if (dest == NULL) {
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| 96 | dest = bltinlookup("HOME", 1);
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| 97 | if (dest == NULL)
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| 98 | error("HOME not set");
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| 99 | } else {
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| 100 | if (argptr[1]) {
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| 101 | /* Do 'ksh' style substitution */
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| 102 | if (!curdir)
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| 103 | error("PWD not set");
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| 104 | p = strstr(curdir, dest);
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| 105 | if (!p)
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| 106 | error("bad substitution");
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| 107 | d = stalloc(strlen(curdir) + strlen(argptr[1]) + 1);
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| 108 | memcpy(d, curdir, p - curdir);
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| 109 | strcpy(d + (p - curdir), argptr[1]);
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| 110 | strcat(d, p + strlen(dest));
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| 111 | dest = d;
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| 112 | print = 1;
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| 113 | }
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| 114 | }
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| 115 |
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| 116 | if (dest[0] == '-' && dest[1] == '\0') {
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| 117 | dest = prevdir ? prevdir : curdir;
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| 118 | print = 1;
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| 119 | }
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| 120 | if (*dest == '\0')
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| 121 | dest = ".";
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| 122 | if (IS_ROOT(dest) || (path = bltinlookup("CDPATH", 1)) == NULL)
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| 123 | path = nullstr;
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| 124 | while ((p = padvance(&path, dest)) != NULL) {
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| 125 | if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
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| 126 | if (!print) {
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| 127 | /*
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| 128 | * XXX - rethink
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| 129 | */
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| 130 | if (p[0] == '.' && p[1] == '/' && p[2] != '\0')
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| 131 | p += 2;
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| 132 | print = strcmp(p, dest);
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| 133 | }
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| 134 | if (docd(p, print) >= 0)
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| 135 | return 0;
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| 136 |
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| 137 | }
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| 138 | }
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| 139 | error("can't cd to %s", dest);
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| 140 | /* NOTREACHED */
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| 141 | }
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| 142 |
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| 143 |
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| 144 | /*
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| 145 | * Actually do the chdir. In an interactive shell, print the
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| 146 | * directory name if "print" is nonzero.
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| 147 | */
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| 148 |
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| 149 | STATIC int
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| 150 | docd(char *dest, int print)
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| 151 | {
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| 152 | char *p;
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| 153 | char *q;
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| 154 | char *component;
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| 155 | struct stat statb;
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| 156 | int first;
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| 157 | int badstat;
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| 158 |
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| 159 | TRACE(("docd(\"%s\", %d) called\n", dest, print));
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| 160 |
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| 161 | /*
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| 162 | * Check each component of the path. If we find a symlink or
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| 163 | * something we can't stat, clear curdir to force a getcwd()
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| 164 | * next time we get the value of the current directory.
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| 165 | */
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| 166 | badstat = 0;
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| 167 | cdcomppath = stalloc(strlen(dest) + 1);
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| 168 | scopy(dest, cdcomppath);
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| 169 | STARTSTACKSTR(p);
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| 170 | if (IS_ROOT(dest)) {
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| 171 | STPUTC('/', p);
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| 172 | cdcomppath++;
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| 173 | }
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| 174 | first = 1;
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| 175 | while ((q = getcomponent()) != NULL) {
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| 176 | if (q[0] == '\0' || (q[0] == '.' && q[1] == '\0'))
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| 177 | continue;
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| 178 | if (! first)
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| 179 | STPUTC('/', p);
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| 180 | first = 0;
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| 181 | component = q;
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| 182 | while (*q)
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| 183 | STPUTC(*q++, p);
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| 184 | if (equal(component, ".."))
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| 185 | continue;
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| 186 | STACKSTRNUL(p);
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| 187 | if ((lstat(stackblock(), &statb) < 0)
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| 188 | || (S_ISLNK(statb.st_mode))) {
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| 189 | /* print = 1; */
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| 190 | badstat = 1;
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| 191 | break;
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| 192 | }
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| 193 | }
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| 194 |
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| 195 | INTOFF;
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| 196 | if (chdir(dest) < 0) {
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| 197 | INTON;
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| 198 | return -1;
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| 199 | }
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| 200 | updatepwd(badstat ? NULL : dest);
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| 201 | INTON;
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| 202 | if (print && iflag && curdir)
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| 203 | out1fmt("%s\n", curdir);
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| 204 | return 0;
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| 205 | }
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| 206 |
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| 207 |
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| 208 | /*
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| 209 | * Get the next component of the path name pointed to by cdcomppath.
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| 210 | * This routine overwrites the string pointed to by cdcomppath.
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| 211 | */
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| 212 |
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| 213 | STATIC char *
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| 214 | getcomponent()
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| 215 | {
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| 216 | char *p;
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| 217 | char *start;
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| 218 |
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| 219 | if ((p = cdcomppath) == NULL)
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| 220 | return NULL;
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| 221 | start = cdcomppath;
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| 222 | while (*p != '/' && *p != '\0')
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| 223 | p++;
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| 224 | if (*p == '\0') {
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| 225 | cdcomppath = NULL;
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| 226 | } else {
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| 227 | *p++ = '\0';
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| 228 | cdcomppath = p;
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| 229 | }
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| 230 | return start;
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| 231 | }
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| 232 |
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| 233 |
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| 234 |
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| 235 | /*
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| 236 | * Update curdir (the name of the current directory) in response to a
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| 237 | * cd command. We also call hashcd to let the routines in exec.c know
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| 238 | * that the current directory has changed.
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| 239 | */
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| 240 |
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| 241 | STATIC void
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| 242 | updatepwd(char *dir)
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| 243 | {
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| 244 | char *new;
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| 245 | char *p;
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| 246 |
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| 247 | hashcd(); /* update command hash table */
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| 248 |
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| 249 | /*
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| 250 | * If our argument is NULL, we don't know the current directory
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| 251 | * any more because we traversed a symbolic link or something
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| 252 | * we couldn't stat().
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| 253 | */
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| 254 | if (dir == NULL || curdir == NULL) {
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| 255 | if (prevdir)
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| 256 | ckfree(prevdir);
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| 257 | INTOFF;
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| 258 | prevdir = curdir;
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| 259 | curdir = NULL;
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| 260 | getpwd(1);
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| 261 | INTON;
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| 262 | if (curdir)
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| 263 | setvar("PWD", curdir, VEXPORT);
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| 264 | else
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| 265 | unsetvar("PWD", 0);
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| 266 | return;
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| 267 | }
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| 268 | cdcomppath = stalloc(strlen(dir) + 1);
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| 269 | scopy(dir, cdcomppath);
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| 270 | STARTSTACKSTR(new);
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| 271 | if (!IS_ROOT(dir)) {
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| 272 | p = curdir;
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| 273 | while (*p)
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| 274 | STPUTC(*p++, new);
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| 275 | if (p[-1] == '/')
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| 276 | STUNPUTC(new);
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| 277 | }
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| 278 | while ((p = getcomponent()) != NULL) {
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| 279 | if (equal(p, "..")) {
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| 280 | while (new > stackblock() && (STUNPUTC(new), *new) != '/');
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| 281 | } else if (*p != '\0' && ! equal(p, ".")) {
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| 282 | STPUTC('/', new);
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| 283 | while (*p)
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| 284 | STPUTC(*p++, new);
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| 285 | }
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| 286 | }
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| 287 | if (new == stackblock())
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| 288 | STPUTC('/', new);
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| 289 | STACKSTRNUL(new);
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| 290 | INTOFF;
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| 291 | if (prevdir)
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| 292 | ckfree(prevdir);
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| 293 | prevdir = curdir;
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| 294 | curdir = savestr(stackblock());
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| 295 | setvar("PWD", curdir, VEXPORT);
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| 296 | INTON;
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| 297 | }
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| 298 |
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| 299 | /*
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| 300 | * Posix says the default should be 'pwd -L' (as below), however
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| 301 | * the 'cd' command (above) does something much nearer to the
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| 302 | * posix 'cd -P' (not the posix default of 'cd -L').
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| 303 | * If 'cd' is changed to support -P/L then the default here
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| 304 | * needs to be revisited if the historic behaviour is to be kept.
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| 305 | */
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| 306 |
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| 307 | int
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| 308 | pwdcmd(int argc, char **argv)
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| 309 | {
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| 310 | int i;
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| 311 | char opt = 'L';
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| 312 |
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| 313 | while ((i = nextopt("LP")) != '\0')
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| 314 | opt = i;
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| 315 | if (*argptr)
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| 316 | error("unexpected argument");
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| 317 |
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| 318 | if (opt == 'L')
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| 319 | getpwd(0);
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| 320 | else
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| 321 | find_curdir(0);
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| 322 |
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| 323 | setvar("PWD", curdir, VEXPORT);
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| 324 | out1str(curdir);
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| 325 | out1c('\n');
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| 326 | return 0;
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| 327 | }
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| 328 |
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| 329 |
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| 330 |
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| 331 |
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| 332 | #define MAXPWD 256
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| 333 |
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| 334 | /*
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| 335 | * Find out what the current directory is. If we already know the current
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| 336 | * directory, this routine returns immediately.
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| 337 | */
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| 338 | void
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| 339 | getpwd(int noerror)
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| 340 | {
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| 341 | char *pwd;
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| 342 | struct stat stdot, stpwd;
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| 343 | static int first = 1;
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| 344 |
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| 345 | if (curdir)
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| 346 | return;
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| 347 |
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| 348 | if (first) {
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| 349 | first = 0;
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| 350 | pwd = getenv("PWD");
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| 351 | if (pwd && IS_ROOT(pwd) && stat(".", &stdot) != -1 &&
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| 352 | stat(pwd, &stpwd) != -1 &&
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| 353 | stdot.st_dev == stpwd.st_dev &&
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| 354 | stdot.st_ino == stpwd.st_ino) {
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| 355 | curdir = savestr(pwd);
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| 356 | return;
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| 357 | }
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| 358 | }
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| 359 |
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| 360 | find_curdir(noerror);
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| 361 |
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| 362 | return;
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| 363 | }
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| 364 |
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| 365 | STATIC void
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| 366 | find_curdir(int noerror)
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| 367 | {
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| 368 | int i;
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| 369 | char *pwd;
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| 370 |
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| 371 | /*
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| 372 | * Things are a bit complicated here; we could have just used
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| 373 | * getcwd, but traditionally getcwd is implemented using popen
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| 374 | * to /bin/pwd. This creates a problem for us, since we cannot
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| 375 | * keep track of the job if it is being ran behind our backs.
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| 376 | * So we re-implement getcwd(), and we suppress interrupts
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| 377 | * throughout the process. This is not completely safe, since
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| 378 | * the user can still break out of it by killing the pwd program.
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| 379 | * We still try to use getcwd for systems that we know have a
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| 380 | * c implementation of getcwd, that does not open a pipe to
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| 381 | * /bin/pwd.
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| 382 | */
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| 383 | #if defined(__NetBSD__) || defined(__SVR4) || defined(__INNOTEK_LIBC__)
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| 384 |
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| 385 | for (i = MAXPWD;; i *= 2) {
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| 386 | pwd = stalloc(i);
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| 387 | if (getcwd(pwd, i) != NULL) {
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| 388 | curdir = savestr(pwd);
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| 389 | return;
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| 390 | }
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| 391 | stunalloc(pwd);
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| 392 | if (errno == ERANGE)
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| 393 | continue;
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| 394 | if (!noerror)
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| 395 | error("getcwd() failed: %s", strerror(errno));
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| 396 | return;
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| 397 | }
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| 398 | #else
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| 399 | {
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| 400 | char *p;
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| 401 | int status;
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| 402 | struct job *jp;
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| 403 | int pip[2];
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| 404 |
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| 405 | pwd = stalloc(MAXPWD);
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| 406 | INTOFF;
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| 407 | if (pipe(pip) < 0)
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| 408 | error("Pipe call failed");
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| 409 | jp = makejob((union node *)NULL, 1);
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| 410 | if (forkshell(jp, (union node *)NULL, FORK_NOJOB) == 0) {
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| 411 | (void) close(pip[0]);
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| 412 | if (pip[1] != 1) {
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| 413 | close(1);
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| 414 | copyfd(pip[1], 1);
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| 415 | close(pip[1]);
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| 416 | }
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| 417 | (void) execl("/bin/pwd", "pwd", (char *)0);
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| 418 | error("Cannot exec /bin/pwd");
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| 419 | }
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| 420 | (void) close(pip[1]);
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| 421 | pip[1] = -1;
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| 422 | p = pwd;
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| 423 | while ((i = read(pip[0], p, pwd + MAXPWD - p)) > 0
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| 424 | || (i == -1 && errno == EINTR)) {
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| 425 | if (i > 0)
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| 426 | p += i;
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| 427 | }
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| 428 | (void) close(pip[0]);
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| 429 | pip[0] = -1;
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| 430 | status = waitforjob(jp);
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| 431 | if (status != 0)
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| 432 | error((char *)0);
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| 433 | if (i < 0 || p == pwd || p[-1] != '\n') {
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| 434 | if (noerror) {
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| 435 | INTON;
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|---|
| 436 | return;
|
|---|
| 437 | }
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|---|
| 438 | error("pwd command failed");
|
|---|
| 439 | }
|
|---|
| 440 | p[-1] = '\0';
|
|---|
| 441 | INTON;
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|---|
| 442 | curdir = savestr(pwd);
|
|---|
| 443 | return;
|
|---|
| 444 | }
|
|---|
| 445 | #endif
|
|---|
| 446 | }
|
|---|
