159243Sobrien/*-
259243Sobrien * Copyright (c) 1992, 1993, 1994
3231990Smp *	The Regents of the University of California.  All rights reserved.
4231990Smp * Copyright (c) 1992, 1993, 1994, 1995, 1996
5231990Smp *	Keith Bostic.  All rights reserved.
659243Sobrien *
7231990Smp * See the LICENSE file for redistribution information.
859243Sobrien */
9231990Smp
10231990Smp#include "config.h"
11231990Smp
12231990Smp#ifndef lint
13231990Smpstatic const char sccsid[] = "$Id: ex_cd.c,v 10.13 2012/04/12 06:28:27 zy Exp $";
14231990Smp#endif /* not lint */
15231990Smp
16231990Smp#include <sys/queue.h>
17231990Smp#include <sys/time.h>
1859243Sobrien
1959243Sobrien#include <bitstring.h>
2059243Sobrien#include <errno.h>
21231990Smp#include <limits.h>
22231990Smp#include <pwd.h>
23231990Smp#include <stdio.h>
24231990Smp#include <stdlib.h>
25231990Smp#include <string.h>
26231990Smp#include <unistd.h>
27231990Smp
28231990Smp#include "../common/common.h"
29231990Smp
30231990Smp/*
31 * ex_cd -- :cd[!] [directory]
32 *	Change directories.
33 *
34 * PUBLIC: int ex_cd __P((SCR *, EXCMD *));
35 */
36int
37ex_cd(SCR *sp, EXCMD *cmdp)
38{
39	struct passwd *pw;
40	ARGS *ap;
41	int savech;
42	char *dir, *p, *t;
43	char *buf;
44	size_t dlen;
45
46	/*
47	 * !!!
48	 * Historic practice is that the cd isn't attempted if the file has
49	 * been modified, unless its name begins with a leading '/' or the
50	 * force flag is set.
51	 */
52	if (F_ISSET(sp->ep, F_MODIFIED) &&
53	    !FL_ISSET(cmdp->iflags, E_C_FORCE) && sp->frp->name[0] != '/') {
54		msgq(sp, M_ERR,
55    "120|File modified since last complete write; write or use ! to override");
56		return (1);
57	}
58
59	switch (cmdp->argc) {
60	case 0:
61		/* If no argument, change to the user's home directory. */
62		if ((dir = getenv("HOME")) == NULL) {
63			if ((pw = getpwuid(getuid())) == NULL ||
64			    pw->pw_dir == NULL || pw->pw_dir[0] == '\0') {
65				msgq(sp, M_ERR,
66			   "121|Unable to find home directory location");
67				return (1);
68			}
69			dir = pw->pw_dir;
70		}
71		break;
72	case 1:
73		INT2CHAR(sp, cmdp->argv[0]->bp, cmdp->argv[0]->len + 1,
74			 dir, dlen);
75		break;
76	default:
77		abort();
78	}
79
80	/*
81	 * Try the current directory first.  If this succeeds, don't display
82	 * a message, vi didn't historically, and it should be obvious to the
83	 * user where they are.
84	 */
85	if (!chdir(dir))
86		return (0);
87
88	/*
89	 * If moving to the user's home directory, or, the path begins with
90	 * "/", "./" or "../", it's the only place we try.
91	 */
92	if (cmdp->argc == 0 ||
93	    (ap = cmdp->argv[0])->bp[0] == '/' ||
94	    (ap->len == 1 && ap->bp[0] == '.') ||
95	    (ap->len >= 2 && ap->bp[0] == '.' && ap->bp[1] == '.' &&
96	    (ap->bp[2] == '/' || ap->bp[2] == '\0')))
97		goto err;
98
99	/* Try the O_CDPATH option values. */
100	for (p = t = O_STR(sp, O_CDPATH);; ++p)
101		if (*p == '\0' || *p == ':') {
102			/*
103			 * Ignore the empty strings and ".", since we've already
104			 * tried the current directory.
105			 */
106			if (t < p && (p - t != 1 || *t != '.')) {
107				savech = *p;
108				*p = '\0';
109				if ((buf = join(t, dir)) == NULL) {
110					msgq(sp, M_SYSERR, NULL);
111					return (1);
112				}
113				*p = savech;
114				if (!chdir(buf)) {
115					free(buf);
116					if ((buf = getcwd(NULL, 0)) != NULL) {
117		msgq_str(sp, M_INFO, buf, "122|New current directory: %s");
118						free(buf);
119					}
120					return (0);
121				}
122				free(buf);
123			}
124			t = p + 1;
125			if (*p == '\0')
126				break;
127		}
128
129err:	msgq_str(sp, M_SYSERR, dir, "%s");
130	return (1);
131}
132