130 lines
3.1 KiB
C
130 lines
3.1 KiB
C
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/*-
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* Copyright (c) 1992, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 1992, 1993, 1994, 1995, 1996
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* Keith Bostic. All rights reserved.
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*
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* See the LICENSE file for redistribution information.
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*/
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#include "config.h"
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#ifndef lint
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static const char sccsid[] = "@(#)ex_cd.c 10.10 (Berkeley) 8/12/96";
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/queue.h>
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#include <bitstring.h>
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#include <errno.h>
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#include <limits.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "../common/common.h"
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/*
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* ex_cd -- :cd[!] [directory]
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* Change directories.
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*
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* PUBLIC: int ex_cd __P((SCR *, EXCMD *));
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*/
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int
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ex_cd(sp, cmdp)
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SCR *sp;
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EXCMD *cmdp;
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{
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struct passwd *pw;
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ARGS *ap;
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CHAR_T savech;
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char *dir, *p, *t; /* XXX: END OF THE STACK, DON'T TRUST GETCWD. */
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char buf[MAXPATHLEN * 2];
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/*
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* !!!
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* Historic practice is that the cd isn't attempted if the file has
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* been modified, unless its name begins with a leading '/' or the
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* force flag is set.
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*/
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if (F_ISSET(sp->ep, F_MODIFIED) &&
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!FL_ISSET(cmdp->iflags, E_C_FORCE) && sp->frp->name[0] != '/') {
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msgq(sp, M_ERR,
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"120|File modified since last complete write; write or use ! to override");
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return (1);
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}
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switch (cmdp->argc) {
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case 0:
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/* If no argument, change to the user's home directory. */
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if ((dir = getenv("HOME")) == NULL) {
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if ((pw = getpwuid(getuid())) == NULL ||
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pw->pw_dir == NULL || pw->pw_dir[0] == '\0') {
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msgq(sp, M_ERR,
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"121|Unable to find home directory location");
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return (1);
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}
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dir = pw->pw_dir;
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}
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break;
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case 1:
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dir = cmdp->argv[0]->bp;
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break;
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default:
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abort();
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}
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/*
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* Try the current directory first. If this succeeds, don't display
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* a message, vi didn't historically, and it should be obvious to the
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* user where they are.
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*/
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if (!chdir(dir))
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return (0);
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/*
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* If moving to the user's home directory, or, the path begins with
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* "/", "./" or "../", it's the only place we try.
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*/
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if (cmdp->argc == 0 ||
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(ap = cmdp->argv[0])->bp[0] == '/' ||
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ap->len == 1 && ap->bp[0] == '.' ||
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ap->len >= 2 && ap->bp[0] == '.' && ap->bp[1] == '.' &&
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(ap->bp[2] == '/' || ap->bp[2] == '\0'))
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goto err;
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/* Try the O_CDPATH option values. */
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for (p = t = O_STR(sp, O_CDPATH);; ++p)
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if (*p == '\0' || *p == ':') {
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/*
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* Empty strings specify ".". The only way to get an
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* empty string is a leading colon, colons in a row,
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* or a trailing colon. Or, to put it the other way,
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* if the length is 1 or less, then we're dealing with
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* ":XXX", "XXX::XXXX" , "XXX:", or "". Since we've
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* already tried dot, we ignore tham all.
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*/
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if (t < p - 1) {
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savech = *p;
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*p = '\0';
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(void)snprintf(buf,
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sizeof(buf), "%s/%s", t, dir);
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*p = savech;
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if (!chdir(buf)) {
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if (getcwd(buf, sizeof(buf)) != NULL)
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msgq_str(sp, M_INFO, buf, "122|New current directory: %s");
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return (0);
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}
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}
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t = p + 1;
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if (*p == '\0')
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break;
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}
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err: msgq_str(sp, M_SYSERR, dir, "%s");
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return (1);
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}
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