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/*-
* 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"
#ifndef lint
static const char sccsid[] = "@(#)ex_cd.c 10.9 (Berkeley) 3/30/96";
#endif /* not lint */
#include <sys/param.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 __P((SCR *, EXCMD *));
*/
int
ex_cd(sp, cmdp)
SCR *sp;
EXCMD *cmdp;
{
struct passwd *pw;
ARGS *ap;
CDPATH *cdp;
char *dir; /* XXX END OF THE STACK, DON'T TRUST GETCWD. */
char buf[MAXPATHLEN * 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) {
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's real
* 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;
/* If the user has a CDPATH variable, try its elements. */
for (cdp = EXP(sp)->cdq.tqh_first; cdp != NULL; cdp = cdp->q.tqe_next) {
(void)snprintf(buf, sizeof(buf), "%s/%s", cdp->path, dir);
if (!chdir(buf)) {
if (getcwd(buf, sizeof(buf)) != NULL)
msgq_str(sp, M_INFO, buf,
"122|New current directory: %s");
return (0);
}
}
err: msgq_str(sp, M_SYSERR, dir, "%s");
return (1);
}
#define FREE_CDPATH(cdp) { \
TAILQ_REMOVE(&exp->cdq, (cdp), q); \
free((cdp)->path); \
free(cdp); \
}
/*
* ex_cdalloc --
* Create a new list of cd paths.
*
* PUBLIC: int ex_cdalloc __P((SCR *, char *));
*/
int
ex_cdalloc(sp, str)
SCR *sp;
char *str;
{
EX_PRIVATE *exp;
CDPATH *cdp;
size_t len;
int founddot;
char *p, *t;
/* Free current queue. */
exp = EXP(sp);
while ((cdp = exp->cdq.tqh_first) != NULL)
FREE_CDPATH(cdp);
/*
* Create new queue. The CDPATH environmental variable (and the
* user's manual entry) are delimited by colon characters.
*/
for (p = t = str, founddot = 0;; ++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 the length is zero, then it's either ":XXX",
* "XXX::XXXX" , "XXX:", or "", and the only failure
* mode is the last one. Note, the string ":" gives
* us two entries of '.', so we only include one of
* them.
*/
if ((len = p - t) == 0) {
if (p == str && *p == '\0')
break;
if (founddot) {
if (*p == '\0')
break;
continue;
}
len = 1;
t = ".";
founddot = 1;
}
MALLOC_RET(sp, cdp, CDPATH *, sizeof(CDPATH));
MALLOC(sp, cdp->path, char *, len + 1);
if (cdp->path == NULL) {
free(cdp);
return (1);
}
memmove(cdp->path, t, len);
cdp->path[len] = '\0';
TAILQ_INSERT_TAIL(&exp->cdq, cdp, q);
t = p + 1;
}
if (*p == '\0')
break;
}
return (0);
}
/* Free previous queue. */
/*
* ex_cdfree --
* Free the cd path list.
*
* PUBLIC: int ex_cdfree __P((SCR *));
*/
int
ex_cdfree(sp)
SCR *sp;
{
EX_PRIVATE *exp;
CDPATH *cdp;
/* Free up cd path information. */
exp = EXP(sp);
while ((cdp = exp->cdq.tqh_first) != NULL)
FREE_CDPATH(cdp);
return (0);
}
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