1 /* $OpenBSD: ex_cd.c,v 1.15 2016/05/27 09:18:12 martijn Exp $ */
2
3 /*-
4 * Copyright (c) 1992, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
6 * Copyright (c) 1992, 1993, 1994, 1995, 1996
7 * Keith Bostic. All rights reserved.
8 *
9 * See the LICENSE file for redistribution information.
10 */
11
12 #include "config.h"
13
14 #include <sys/queue.h>
15
16 #include <bitstring.h>
17 #include <errno.h>
18 #include <limits.h>
19 #include <pwd.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <unistd.h>
24
25 #include "../common/common.h"
26
27 /*
28 * ex_cd -- :cd[!] [directory]
29 * Change directories.
30 *
31 * PUBLIC: int ex_cd(SCR *, EXCMD *);
32 */
33 int
ex_cd(SCR * sp,EXCMD * cmdp)34 ex_cd(SCR *sp, EXCMD *cmdp)
35 {
36 struct passwd *pw;
37 ARGS *ap;
38 CHAR_T savech;
39 char *dir, *p, *t;
40 char buf[PATH_MAX * 2];
41
42 /*
43 * !!!
44 * Historic practice is that the cd isn't attempted if the file has
45 * been modified, unless its name begins with a leading '/' or the
46 * force flag is set.
47 */
48 if (F_ISSET(sp->ep, F_MODIFIED) &&
49 !FL_ISSET(cmdp->iflags, E_C_FORCE) && sp->frp->name[0] != '/') {
50 msgq(sp, M_ERR,
51 "File modified since last complete write; write or use ! to override");
52 return (1);
53 }
54
55 switch (cmdp->argc) {
56 case 0:
57 /* If no argument, change to the user's home directory. */
58 if ((dir = getenv("HOME")) == NULL || *dir == '\0') {
59 if ((pw = getpwuid(getuid())) == NULL ||
60 pw->pw_dir == NULL || pw->pw_dir[0] == '\0') {
61 msgq(sp, M_ERR,
62 "Unable to find home directory location");
63 return (1);
64 }
65 dir = pw->pw_dir;
66 }
67 break;
68 case 1:
69 dir = cmdp->argv[0]->bp;
70 break;
71 default:
72 abort();
73 }
74
75 /*
76 * Try the current directory first. If this succeeds, don't display
77 * a message, vi didn't historically, and it should be obvious to the
78 * user where they are.
79 */
80 if (!chdir(dir))
81 return (0);
82
83 /*
84 * If moving to the user's home directory, or, the path begins with
85 * "/", "./" or "../", it's the only place we try.
86 */
87 if (cmdp->argc == 0 ||
88 (ap = cmdp->argv[0])->bp[0] == '/' ||
89 (ap->len == 1 && ap->bp[0] == '.') ||
90 (ap->len >= 2 && ap->bp[0] == '.' && ap->bp[1] == '.' &&
91 (ap->bp[2] == '/' || ap->bp[2] == '\0')))
92 goto err;
93
94 /* Try the O_CDPATH option values. */
95 for (p = t = O_STR(sp, O_CDPATH);; ++p)
96 if (*p == '\0' || *p == ':') {
97 /*
98 * Empty strings specify ".". The only way to get an
99 * empty string is a leading colon, colons in a row,
100 * or a trailing colon. Or, to put it the other way,
101 * if the length is 1 or less, then we're dealing with
102 * ":XXX", "XXX::XXXX" , "XXX:", or "". Since we've
103 * already tried dot, we ignore them all.
104 */
105 if (t < p - 1) {
106 savech = *p;
107 *p = '\0';
108 (void)snprintf(buf,
109 sizeof(buf), "%s/%s", t, dir);
110 *p = savech;
111 if (!chdir(buf)) {
112 if (getcwd(buf, sizeof(buf)) != NULL)
113 msgq_str(sp, M_INFO, buf, "New current directory: %s");
114 return (0);
115 }
116 }
117 t = p + 1;
118 if (*p == '\0')
119 break;
120 }
121
122 err: msgq_str(sp, M_SYSERR, dir, "%s");
123 return (1);
124 }
125