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/* $OpenBSD: ex_cd.c,v 1.11 2015/01/16 06:40:14 deraadt Exp $ */
/*-
* Copyright (c) 1992, 1993, 1994
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1992, 1993, 1994, 1995, 1996
* Keith Bostic. All rights reserved.
*
* See the LICENSE file for redistribution information.
*/
#include "config.h"
#include <sys/queue.h>
#include <bitstring.h>
#include <errno.h>
#include <limits.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "../common/common.h"
/*
* ex_cd -- :cd[!] [directory]
* Change directories.
*
* PUBLIC: int ex_cd(SCR *, EXCMD *);
*/
int
ex_cd(SCR *sp, EXCMD *cmdp)
{
struct passwd *pw;
ARGS *ap;
CHAR_T savech;
char *dir, *p, *t; /* XXX: END OF THE STACK, DON'T TRUST GETCWD. */
char buf[PATH_MAX * 2];
/*
* !!!
* Historic practice is that the cd isn't attempted if the file has
* been modified, unless its name begins with a leading '/' or the
* force flag is set.
*/
if (F_ISSET(sp->ep, F_MODIFIED) &&
!FL_ISSET(cmdp->iflags, E_C_FORCE) && sp->frp->name[0] != '/') {
msgq(sp, M_ERR,
"120|File modified since last complete write; write or use ! to override");
return (1);
}
switch (cmdp->argc) {
case 0:
/* If no argument, change to the user's home directory. */
if ((dir = getenv("HOME")) == NULL || *dir == '\0') {
if ((pw = getpwuid(getuid())) == NULL ||
pw->pw_dir == NULL || pw->pw_dir[0] == '\0') {
msgq(sp, M_ERR,
"121|Unable to find home directory location");
return (1);
}
dir = pw->pw_dir;
}
break;
case 1:
dir = cmdp->argv[0]->bp;
break;
default:
abort();
}
/*
* Try the current directory first. If this succeeds, don't display
* a message, vi didn't historically, and it should be obvious to the
* user where they are.
*/
if (!chdir(dir))
return (0);
/*
* If moving to the user's home directory, or, the path begins with
* "/", "./" or "../", it's the only place we try.
*/
if (cmdp->argc == 0 ||
(ap = cmdp->argv[0])->bp[0] == '/' ||
(ap->len == 1 && ap->bp[0] == '.') ||
(ap->len >= 2 && ap->bp[0] == '.' && ap->bp[1] == '.' &&
(ap->bp[2] == '/' || ap->bp[2] == '\0')))
goto err;
/* Try the O_CDPATH option values. */
for (p = t = O_STR(sp, O_CDPATH);; ++p)
if (*p == '\0' || *p == ':') {
/*
* Empty strings specify ".". The only way to get an
* empty string is a leading colon, colons in a row,
* or a trailing colon. Or, to put it the other way,
* if the length is 1 or less, then we're dealing with
* ":XXX", "XXX::XXXX" , "XXX:", or "". Since we've
* already tried dot, we ignore them all.
*/
if (t < p - 1) {
savech = *p;
*p = '\0';
(void)snprintf(buf,
sizeof(buf), "%s/%s", t, dir);
*p = savech;
if (!chdir(buf)) {
if (getcwd(buf, sizeof(buf)) != NULL)
msgq_str(sp, M_INFO, buf, "122|New current directory: %s");
return (0);
}
}
t = p + 1;
if (*p == '\0')
break;
}
err: msgq_str(sp, M_SYSERR, dir, "%s");
return (1);
}
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