| 1 | /*-
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| 2 | * Copyright (c) 1991 The Regents of the University of California.
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * This code is derived from software contributed to Berkeley by
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| 6 | * Kenneth Almquist.
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| 7 | *
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| 8 | * Redistribution and use in source and binary forms, with or without
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| 9 | * modification, are permitted provided that the following conditions
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| 10 | * are met:
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| 11 | * 1. Redistributions of source code must retain the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer.
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer in the
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| 15 | * documentation and/or other materials provided with the distribution.
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| 16 | * 3. All advertising materials mentioning features or use of this software
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| 17 | * must display the following acknowledgement:
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| 18 | * This product includes software developed by the University of
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| 19 | * California, Berkeley and its contributors.
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| 20 | * 4. Neither the name of the University nor the names of its contributors
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| 21 | * may be used to endorse or promote products derived from this software
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| 22 | * without specific prior written permission.
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| 23 | *
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| 24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 34 | * SUCH DAMAGE.
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| 35 | */
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| 36 |
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| 37 | #ifndef lint
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| 38 | static char sccsid[] = "@(#)cd.c 5.2 (Berkeley) 3/13/91";
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| 39 | #endif /* not lint */
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| 40 |
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| 41 | /*
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| 42 | * The cd and pwd commands.
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| 43 | */
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| 44 |
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| 45 | #include "shell.h"
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| 46 | #include "var.h"
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| 47 | #include "nodes.h" /* for jobs.h */
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| 48 | #include "jobs.h"
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| 49 | #include "options.h"
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| 50 | #include "output.h"
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| 51 | #include "memalloc.h"
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| 52 | #include "error.h"
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| 53 | #include "mystring.h"
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| 54 | #include <sys/types.h>
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| 55 | #include <sys/stat.h>
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| 56 | #include <errno.h>
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| 57 |
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| 58 |
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| 59 | #ifdef __STDC__
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| 60 | STATIC int docd(char *, int, int);
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| 61 | STATIC void updatepwd(char *);
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| 62 | STATIC void getpwd(void);
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| 63 | STATIC char *getcomponent(void);
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| 64 | #else
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| 65 | STATIC int docd();
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| 66 | STATIC void updatepwd();
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| 67 | STATIC void getpwd();
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| 68 | STATIC char *getcomponent();
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| 69 | #endif
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| 70 |
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| 71 |
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| 72 | char *curdir; /* current working directory */
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| 73 | STATIC char *cdcomppath;
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| 74 |
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| 75 | #if UDIR || TILDE
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| 76 | extern int didudir; /* set if /u/logname or ~logname expanded */
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| 77 | #endif
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| 78 |
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| 79 |
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| 80 | int
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| 81 | cdcmd(argc, argv) char **argv; {
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| 82 | char *dest;
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| 83 | char *path;
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| 84 | char *p;
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| 85 | struct stat statb;
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| 86 | char *padvance();
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| 87 | int tohome= 0;
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| 88 |
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| 89 | nextopt(nullstr);
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| 90 | if ((dest = *argptr) == NULL) {
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| 91 | if ((dest = bltinlookup("HOME", 1)) == NULL)
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| 92 | error("HOME not set");
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| 93 | tohome = 1;
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| 94 | }
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| 95 | if (*dest == '/' || (path = bltinlookup("CDPATH", 1)) == NULL)
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| 96 | path = nullstr;
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| 97 | while ((p = padvance(&path, dest)) != NULL) {
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| 98 | if (stat(p, &statb) >= 0
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| 99 | && (statb.st_mode & S_IFMT) == S_IFDIR
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| 100 | && docd(p, strcmp(p, dest), tohome) >= 0)
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| 101 | return 0;
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| 102 | }
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| 103 | error("can't cd to %s", dest);
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| 104 | }
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| 105 |
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| 106 |
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| 107 | /*
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| 108 | * Actually do the chdir. If the name refers to symbolic links, we
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| 109 | * compute the actual directory name before doing the cd. In an
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| 110 | * interactive shell, print the directory name if "print" is nonzero
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| 111 | * or if the name refers to a symbolic link. We also print the name
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| 112 | * if "/u/logname" was expanded in it, since this is similar to a
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| 113 | * symbolic link. (The check for this breaks if the user gives the
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| 114 | * cd command some additional, unused arguments.)
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| 115 | */
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| 116 |
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| 117 | #if SYMLINKS == 0
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| 118 | STATIC int
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| 119 | docd(dest, print, tohome)
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| 120 | char *dest;
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| 121 | {
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| 122 | #if UDIR || TILDE
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| 123 | if (didudir)
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| 124 | print = 1;
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| 125 | #endif
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| 126 | INTOFF;
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| 127 | if (chdir(dest) < 0) {
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| 128 | INTON;
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| 129 | return -1;
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| 130 | }
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| 131 | updatepwd(dest);
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| 132 | INTON;
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| 133 | if (print && iflag)
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| 134 | out1fmt("%s\n", stackblock());
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| 135 | return 0;
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| 136 | }
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| 137 |
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| 138 | #else
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| 139 |
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| 140 |
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| 141 |
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| 142 | STATIC int
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| 143 | docd(dest, print, tohome)
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| 144 | char *dest;
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| 145 | {
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| 146 | register char *p;
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| 147 | register char *q;
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| 148 | char *symlink;
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| 149 | char *component;
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| 150 | struct stat statb;
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| 151 | int first;
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| 152 | int i;
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| 153 |
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| 154 | TRACE(("docd(\"%s\", %d, %d) called\n", dest, print, tohome));
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| 155 | #if UDIR || TILDE
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| 156 | if (didudir)
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| 157 | print = 1;
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| 158 | #endif
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| 159 |
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| 160 | top:
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| 161 | cdcomppath = dest;
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| 162 | STARTSTACKSTR(p);
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| 163 | if (*dest == '/') {
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| 164 | STPUTC('/', p);
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| 165 | cdcomppath++;
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| 166 | }
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| 167 | first = 1;
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| 168 | while ((q = getcomponent()) != NULL) {
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| 169 | if (q[0] == '\0' || q[0] == '.' && q[1] == '\0')
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| 170 | continue;
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| 171 | if (! first)
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| 172 | STPUTC('/', p);
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| 173 | first = 0;
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| 174 | component = q;
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| 175 | while (*q)
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| 176 | STPUTC(*q++, p);
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| 177 | if (equal(component, ".."))
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| 178 | continue;
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| 179 | STACKSTRNUL(p);
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| 180 | if (lstat(stackblock(), &statb) < 0)
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| 181 | error("lstat %s failed", stackblock());
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| 182 | if ((statb.st_mode & S_IFMT) != S_IFLNK)
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| 183 | continue;
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| 184 |
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| 185 | /* Hit a symbolic link. We have to start all over again. */
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| 186 | print = 1;
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| 187 | STPUTC('\0', p);
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| 188 | symlink = grabstackstr(p);
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| 189 | i = (int)statb.st_size + 2; /* 2 for '/' and '\0' */
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| 190 | if (cdcomppath != NULL)
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| 191 | i += strlen(cdcomppath);
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| 192 | p = stalloc(i);
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| 193 | if (readlink(symlink, p, (int)statb.st_size) < 0) {
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| 194 | error("readlink %s failed", stackblock());
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| 195 | }
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| 196 | if (cdcomppath != NULL) {
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| 197 | p[(int)statb.st_size] = '/';
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| 198 | scopy(cdcomppath, p + (int)statb.st_size + 1);
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| 199 | } else {
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| 200 | p[(int)statb.st_size] = '\0';
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| 201 | }
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| 202 | if (p[0] != '/') { /* relative path name */
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| 203 | char *r;
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| 204 | q = r = symlink;
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| 205 | while (*q) {
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| 206 | if (*q++ == '/')
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| 207 | r = q;
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| 208 | }
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| 209 | *r = '\0';
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| 210 | dest = stalloc(strlen(symlink) + strlen(p) + 1);
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| 211 | scopy(symlink, dest);
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| 212 | strcat(dest, p);
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| 213 | } else {
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| 214 | dest = p;
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| 215 | }
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| 216 | goto top;
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| 217 | }
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| 218 | STPUTC('\0', p);
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| 219 | p = grabstackstr(p);
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| 220 | INTOFF;
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| 221 | /* The empty string is not a legal argument to chdir on a POSIX 1003.1
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| 222 | * system. */
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| 223 | if (p[0] != '\0' && chdir(p) < 0) {
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| 224 | INTON;
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| 225 | return -1;
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| 226 | }
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| 227 | updatepwd(p);
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| 228 | INTON;
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| 229 | if (print && !tohome && iflag)
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| 230 | out1fmt("%s\n", p);
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| 231 | return 0;
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| 232 | }
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| 233 | #endif /* SYMLINKS */
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| 234 |
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| 235 |
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| 236 |
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| 237 | /*
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| 238 | * Get the next component of the path name pointed to by cdcomppath.
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| 239 | * This routine overwrites the string pointed to by cdcomppath.
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| 240 | */
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| 241 |
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| 242 | STATIC char *
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| 243 | getcomponent() {
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| 244 | register char *p;
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| 245 | char *start;
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| 246 |
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| 247 | if ((p = cdcomppath) == NULL)
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| 248 | return NULL;
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| 249 | start = cdcomppath;
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| 250 | while (*p != '/' && *p != '\0')
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| 251 | p++;
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| 252 | if (*p == '\0') {
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| 253 | cdcomppath = NULL;
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| 254 | } else {
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| 255 | *p++ = '\0';
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| 256 | cdcomppath = p;
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| 257 | }
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| 258 | return start;
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| 259 | }
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| 260 |
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| 261 |
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| 262 |
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| 263 | /*
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| 264 | * Update curdir (the name of the current directory) in response to a
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| 265 | * cd command. We also call hashcd to let the routines in exec.c know
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| 266 | * that the current directory has changed.
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| 267 | */
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| 268 |
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| 269 | void hashcd();
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| 270 |
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| 271 | STATIC void
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| 272 | updatepwd(dir)
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| 273 | char *dir;
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| 274 | {
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| 275 | char *new;
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| 276 | char *p;
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| 277 |
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| 278 | hashcd(); /* update command hash table */
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| 279 | cdcomppath = stalloc(strlen(dir) + 1);
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| 280 | scopy(dir, cdcomppath);
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| 281 | STARTSTACKSTR(new);
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| 282 | if (*dir != '/') {
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| 283 | if (curdir == NULL)
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| 284 | return;
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| 285 | p = curdir;
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| 286 | while (*p)
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| 287 | STPUTC(*p++, new);
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| 288 | if (p[-1] == '/')
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| 289 | STUNPUTC(new);
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| 290 | }
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| 291 | while ((p = getcomponent()) != NULL) {
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| 292 | if (equal(p, "..")) {
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| 293 | while (new > stackblock() && (STUNPUTC(new), *new) != '/');
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| 294 | } else if (*p != '\0' && ! equal(p, ".")) {
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| 295 | STPUTC('/', new);
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| 296 | while (*p)
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| 297 | STPUTC(*p++, new);
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| 298 | }
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| 299 | }
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| 300 | if (new == stackblock())
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| 301 | STPUTC('/', new);
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| 302 | STACKSTRNUL(new);
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| 303 | if (curdir)
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| 304 | ckfree(curdir);
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| 305 | curdir = savestr(stackblock());
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| 306 | }
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| 307 |
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| 308 |
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| 309 |
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| 310 | int
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| 311 | pwdcmd(argc, argv) char **argv; {
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| 312 | getpwd();
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| 313 | out1str(curdir);
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| 314 | out1c('\n');
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| 315 | return 0;
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| 316 | }
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| 317 |
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| 318 |
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| 319 |
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| 320 | /*
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| 321 | * Run /bin/pwd to find out what the current directory is. We suppress
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| 322 | * interrupts throughout most of this, but the user can still break out
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| 323 | * of it by killing the pwd program. If we already know the current
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| 324 | * directory, this routine returns immediately.
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| 325 | */
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| 326 |
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| 327 | #define MAXPWD 256
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| 328 |
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| 329 | STATIC void
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| 330 | getpwd() {
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| 331 | char buf[MAXPWD];
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| 332 | char *p;
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| 333 | int i;
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| 334 | int status;
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| 335 | struct job *jp;
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| 336 | int pip[2];
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| 337 |
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| 338 | if (curdir)
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| 339 | return;
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| 340 | INTOFF;
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| 341 | if (pipe(pip) < 0)
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| 342 | error("Pipe call failed");
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| 343 | jp = makejob((union node *)NULL, 1);
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| 344 | if (forkshell(jp, (union node *)NULL, FORK_NOJOB) == 0) {
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| 345 | close(pip[0]);
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| 346 | if (pip[1] != 1) {
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| 347 | close(1);
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| 348 | copyfd(pip[1], 1);
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| 349 | close(pip[1]);
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| 350 | }
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| 351 | execl("/bin/pwd", "pwd", (char *)0);
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| 352 | error("Cannot exec /bin/pwd");
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| 353 | }
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| 354 | close(pip[1]);
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| 355 | pip[1] = -1;
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| 356 | p = buf;
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| 357 | while ((i = read(pip[0], p, buf + MAXPWD - p)) > 0
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| 358 | || i == -1 && errno == EINTR) {
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| 359 | if (i > 0)
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| 360 | p += i;
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| 361 | }
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| 362 | close(pip[0]);
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| 363 | pip[0] = -1;
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| 364 | status = waitforjob(jp);
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| 365 | if (status != 0)
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| 366 | error((char *)0);
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| 367 | if (i < 0 || p == buf || p[-1] != '\n')
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| 368 | error("pwd command failed");
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| 369 | p[-1] = '\0';
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| 370 | curdir = savestr(buf);
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| 371 | INTON;
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| 372 | }
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