cd.c revision 100663
11556Srgrimes/*- 21556Srgrimes * Copyright (c) 1991, 1993 31556Srgrimes * The Regents of the University of California. All rights reserved. 41556Srgrimes * 51556Srgrimes * This code is derived from software contributed to Berkeley by 61556Srgrimes * Kenneth Almquist. 71556Srgrimes * 81556Srgrimes * Redistribution and use in source and binary forms, with or without 91556Srgrimes * modification, are permitted provided that the following conditions 101556Srgrimes * are met: 111556Srgrimes * 1. Redistributions of source code must retain the above copyright 121556Srgrimes * notice, this list of conditions and the following disclaimer. 131556Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141556Srgrimes * notice, this list of conditions and the following disclaimer in the 151556Srgrimes * documentation and/or other materials provided with the distribution. 161556Srgrimes * 3. All advertising materials mentioning features or use of this software 171556Srgrimes * must display the following acknowledgement: 181556Srgrimes * This product includes software developed by the University of 191556Srgrimes * California, Berkeley and its contributors. 201556Srgrimes * 4. Neither the name of the University nor the names of its contributors 211556Srgrimes * may be used to endorse or promote products derived from this software 221556Srgrimes * without specific prior written permission. 231556Srgrimes * 241556Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 251556Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 261556Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 271556Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 281556Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 291556Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 301556Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 311556Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 321556Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 331556Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 341556Srgrimes * SUCH DAMAGE. 351556Srgrimes */ 361556Srgrimes 371556Srgrimes#ifndef lint 3836150Scharnier#if 0 3936150Scharnierstatic char sccsid[] = "@(#)cd.c 8.2 (Berkeley) 5/4/95"; 4036150Scharnier#endif 411556Srgrimes#endif /* not lint */ 4299110Sobrien#include <sys/cdefs.h> 4399110Sobrien__FBSDID("$FreeBSD: head/bin/sh/cd.c 100663 2002-07-25 10:47:38Z tjr $"); 441556Srgrimes 4517987Speter#include <sys/types.h> 4617987Speter#include <sys/stat.h> 4717987Speter#include <stdlib.h> 4820425Ssteve#include <string.h> 4917987Speter#include <unistd.h> 5017987Speter#include <errno.h> 51100661Stjr#include <limits.h> 5217987Speter 531556Srgrimes/* 541556Srgrimes * The cd and pwd commands. 551556Srgrimes */ 561556Srgrimes 571556Srgrimes#include "shell.h" 581556Srgrimes#include "var.h" 591556Srgrimes#include "nodes.h" /* for jobs.h */ 601556Srgrimes#include "jobs.h" 611556Srgrimes#include "options.h" 621556Srgrimes#include "output.h" 631556Srgrimes#include "memalloc.h" 641556Srgrimes#include "error.h" 6520425Ssteve#include "exec.h" 6617987Speter#include "redir.h" 671556Srgrimes#include "mystring.h" 6817987Speter#include "show.h" 6920425Ssteve#include "cd.h" 701556Srgrimes 7197092StjrSTATIC int cdlogical(char *); 7297092StjrSTATIC int cdphysical(char *); 7397092StjrSTATIC int docd(char *, int, int); 7490111SimpSTATIC char *getcomponent(void); 7597092StjrSTATIC int updatepwd(char *); 761556Srgrimes 7720425Sstevechar *curdir = NULL; /* current working directory */ 781556Srgrimeschar *prevdir; /* previous working directory */ 791556SrgrimesSTATIC char *cdcomppath; 801556Srgrimes 811556Srgrimesint 8297092Stjrcdcmd(int argc, char **argv) 8317987Speter{ 841556Srgrimes char *dest; 851556Srgrimes char *path; 861556Srgrimes char *p; 871556Srgrimes struct stat statb; 8897092Stjr int ch, phys, print = 0; 891556Srgrimes 90100663Stjr optreset = 1; optind = 1; opterr = 0; /* initialize getopt */ 9197092Stjr phys = 0; 9297092Stjr while ((ch = getopt(argc, argv, "LP")) != -1) { 9397092Stjr switch (ch) { 9497092Stjr case 'L': 9597092Stjr phys = 0; 9697092Stjr break; 9797092Stjr case 'P': 9897092Stjr phys = 1; 9997092Stjr break; 10097092Stjr default: 10197092Stjr error("unknown option: -%c", optopt); 10297092Stjr break; 10397092Stjr } 10497092Stjr } 10597092Stjr argc -= optind; 10697092Stjr argv += optind; 10797092Stjr 10897092Stjr if (argc > 1) 10997092Stjr error("too many arguments"); 11097092Stjr 11197092Stjr if ((dest = *argv) == NULL && (dest = bltinlookup("HOME", 1)) == NULL) 1121556Srgrimes error("HOME not set"); 1135234Sbde if (*dest == '\0') 1145234Sbde dest = "."; 1151556Srgrimes if (dest[0] == '-' && dest[1] == '\0') { 1161556Srgrimes dest = prevdir ? prevdir : curdir; 11712273Speter if (dest) 11812273Speter print = 1; 11912273Speter else 12012273Speter dest = "."; 1211556Srgrimes } 1221556Srgrimes if (*dest == '/' || (path = bltinlookup("CDPATH", 1)) == NULL) 1231556Srgrimes path = nullstr; 1241556Srgrimes while ((p = padvance(&path, dest)) != NULL) { 12517987Speter if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) { 1261556Srgrimes if (!print) { 1271556Srgrimes /* 1281556Srgrimes * XXX - rethink 1291556Srgrimes */ 13038886Stegge if (p[0] == '.' && p[1] == '/' && p[2] != '\0') 1311556Srgrimes p += 2; 1321556Srgrimes print = strcmp(p, dest); 1331556Srgrimes } 13497092Stjr if (docd(p, print, phys) >= 0) 1351556Srgrimes return 0; 1361556Srgrimes } 1371556Srgrimes } 1381556Srgrimes error("can't cd to %s", dest); 13917987Speter /*NOTREACHED*/ 14017987Speter return 0; 1411556Srgrimes} 1421556Srgrimes 1431556Srgrimes 1441556Srgrimes/* 14597092Stjr * Actually change the directory. In an interactive shell, print the 14620774Ssteve * directory name if "print" is nonzero. 1471556Srgrimes */ 1481556SrgrimesSTATIC int 14997092Stjrdocd(char *dest, int print, int phys) 15020425Ssteve{ 15197092Stjr 15297092Stjr TRACE(("docd(\"%s\", %d, %d) called\n", dest, print, phys)); 15397092Stjr 15497092Stjr /* If logical cd fails, fall back to physical. */ 15597092Stjr if ((phys || cdlogical(dest) < 0) && cdphysical(dest) < 0) 15697092Stjr return (-1); 15797092Stjr 15897092Stjr if (print && iflag && curdir) 15997092Stjr out1fmt("%s\n", curdir); 16097092Stjr 16197092Stjr return 0; 16297092Stjr} 16397092Stjr 16497092StjrSTATIC int 16597092Stjrcdlogical(char *dest) 16697092Stjr{ 16738886Stegge char *p; 16838886Stegge char *q; 16938886Stegge char *component; 17038886Stegge struct stat statb; 17138886Stegge int first; 17238886Stegge int badstat; 17320425Ssteve 17438886Stegge /* 17538886Stegge * Check each component of the path. If we find a symlink or 17638886Stegge * something we can't stat, clear curdir to force a getcwd() 17738886Stegge * next time we get the value of the current directory. 17838886Stegge */ 17938886Stegge badstat = 0; 18038886Stegge cdcomppath = stalloc(strlen(dest) + 1); 18138886Stegge scopy(dest, cdcomppath); 18238886Stegge STARTSTACKSTR(p); 18338886Stegge if (*dest == '/') { 18438886Stegge STPUTC('/', p); 18538886Stegge cdcomppath++; 18638886Stegge } 18738886Stegge first = 1; 18838886Stegge while ((q = getcomponent()) != NULL) { 18938886Stegge if (q[0] == '\0' || (q[0] == '.' && q[1] == '\0')) 19038886Stegge continue; 19138886Stegge if (! first) 19238886Stegge STPUTC('/', p); 19338886Stegge first = 0; 19438886Stegge component = q; 19538886Stegge while (*q) 19638886Stegge STPUTC(*q++, p); 19738886Stegge if (equal(component, "..")) 19838886Stegge continue; 19938886Stegge STACKSTRNUL(p); 20097092Stjr if (lstat(stackblock(), &statb) < 0) { 20138886Stegge badstat = 1; 20238886Stegge break; 20338886Stegge } 20438886Stegge } 20538886Stegge 2061556Srgrimes INTOFF; 20797092Stjr if (updatepwd(badstat ? NULL : dest) < 0 || chdir(curdir) < 0) { 2081556Srgrimes INTON; 20997092Stjr return (-1); 2101556Srgrimes } 2111556Srgrimes INTON; 21297092Stjr return (0); 2131556Srgrimes} 2141556Srgrimes 21597092StjrSTATIC int 21697092Stjrcdphysical(char *dest) 21797092Stjr{ 2181556Srgrimes 21997092Stjr INTOFF; 22097092Stjr if (chdir(dest) < 0 || updatepwd(NULL) < 0) { 22197092Stjr INTON; 22297092Stjr return (-1); 22397092Stjr } 22497092Stjr INTON; 22597092Stjr return (0); 22697092Stjr} 22797092Stjr 2281556Srgrimes/* 2291556Srgrimes * Get the next component of the path name pointed to by cdcomppath. 2301556Srgrimes * This routine overwrites the string pointed to by cdcomppath. 2311556Srgrimes */ 2321556SrgrimesSTATIC char * 23390111Simpgetcomponent(void) 23420774Ssteve{ 23525222Ssteve char *p; 2361556Srgrimes char *start; 2371556Srgrimes 2381556Srgrimes if ((p = cdcomppath) == NULL) 2391556Srgrimes return NULL; 2401556Srgrimes start = cdcomppath; 2411556Srgrimes while (*p != '/' && *p != '\0') 2421556Srgrimes p++; 2431556Srgrimes if (*p == '\0') { 2441556Srgrimes cdcomppath = NULL; 2451556Srgrimes } else { 2461556Srgrimes *p++ = '\0'; 2471556Srgrimes cdcomppath = p; 2481556Srgrimes } 2491556Srgrimes return start; 2501556Srgrimes} 2511556Srgrimes 2521556Srgrimes 2531556Srgrimes/* 25438886Stegge * Update curdir (the name of the current directory) in response to a 25538886Stegge * cd command. We also call hashcd to let the routines in exec.c know 25638886Stegge * that the current directory has changed. 2571556Srgrimes */ 25897092StjrSTATIC int 25990111Simpupdatepwd(char *dir) 26020774Ssteve{ 2611556Srgrimes char *new; 2621556Srgrimes char *p; 2631556Srgrimes 26438886Stegge hashcd(); /* update command hash table */ 26538886Stegge 26638886Stegge /* 26738886Stegge * If our argument is NULL, we don't know the current directory 26838886Stegge * any more because we traversed a symbolic link or something 26938886Stegge * we couldn't stat(). 27038886Stegge */ 27138886Stegge if (dir == NULL || curdir == NULL) { 27238886Stegge if (prevdir) 27338886Stegge ckfree(prevdir); 27438886Stegge INTOFF; 27538886Stegge prevdir = curdir; 27638886Stegge curdir = NULL; 27797092Stjr if (getpwd() == NULL) { 27897092Stjr INTON; 27997092Stjr return (-1); 28097092Stjr } 28186176Stegge setvar("PWD", curdir, VEXPORT); 28286176Stegge setvar("OLDPWD", prevdir, VEXPORT); 28338886Stegge INTON; 28497092Stjr return (0); 28538886Stegge } 2861556Srgrimes cdcomppath = stalloc(strlen(dir) + 1); 2871556Srgrimes scopy(dir, cdcomppath); 2881556Srgrimes STARTSTACKSTR(new); 2891556Srgrimes if (*dir != '/') { 2901556Srgrimes p = curdir; 2911556Srgrimes while (*p) 2921556Srgrimes STPUTC(*p++, new); 2931556Srgrimes if (p[-1] == '/') 2941556Srgrimes STUNPUTC(new); 2951556Srgrimes } 2961556Srgrimes while ((p = getcomponent()) != NULL) { 2971556Srgrimes if (equal(p, "..")) { 2981556Srgrimes while (new > stackblock() && (STUNPUTC(new), *new) != '/'); 2991556Srgrimes } else if (*p != '\0' && ! equal(p, ".")) { 3001556Srgrimes STPUTC('/', new); 3011556Srgrimes while (*p) 3021556Srgrimes STPUTC(*p++, new); 3031556Srgrimes } 3041556Srgrimes } 3051556Srgrimes if (new == stackblock()) 3061556Srgrimes STPUTC('/', new); 3071556Srgrimes STACKSTRNUL(new); 30838886Stegge INTOFF; 30938886Stegge if (prevdir) 31038886Stegge ckfree(prevdir); 31138886Stegge prevdir = curdir; 31238886Stegge curdir = savestr(stackblock()); 31386176Stegge setvar("PWD", curdir, VEXPORT); 31486176Stegge setvar("OLDPWD", prevdir, VEXPORT); 31538886Stegge INTON; 31697092Stjr 31797092Stjr return (0); 3181556Srgrimes} 3191556Srgrimes 3201556Srgrimesint 321100660Stjrpwdcmd(int argc, char **argv) 32217987Speter{ 323100661Stjr char buf[PATH_MAX]; 32497092Stjr int ch, phys; 3251556Srgrimes 326100663Stjr optreset = 1; optind = 1; opterr = 0; /* initialize getopt */ 32797092Stjr phys = 0; 32897092Stjr while ((ch = getopt(argc, argv, "LP")) != -1) { 32997092Stjr switch (ch) { 33097092Stjr case 'L': 33197092Stjr phys = 0; 33297092Stjr break; 33397092Stjr case 'P': 33497092Stjr phys = 1; 33597092Stjr break; 33697092Stjr default: 33797092Stjr error("unknown option: -%c", optopt); 33897092Stjr break; 33997092Stjr } 34097092Stjr } 34197092Stjr argc -= optind; 34297092Stjr argv += optind; 3431556Srgrimes 34497092Stjr if (argc != 0) 34597092Stjr error("too many arguments"); 34638886Stegge 34797092Stjr if (!phys && getpwd()) { 34897092Stjr out1str(curdir); 34997092Stjr out1c('\n'); 35097092Stjr } else { 35197092Stjr if (getcwd(buf, sizeof(buf)) == NULL) 35297092Stjr error(".: %s", strerror(errno)); 35397092Stjr out1str(buf); 35497092Stjr out1c('\n'); 35597092Stjr } 35638886Stegge 35797092Stjr return 0; 35897092Stjr} 35938886Stegge 3601556Srgrimes/* 36120774Ssteve * Find out what the current directory is. If we already know the current 3621556Srgrimes * directory, this routine returns immediately. 3631556Srgrimes */ 36420774Sstevechar * 36590111Simpgetpwd(void) 36620425Ssteve{ 367100661Stjr char buf[PATH_MAX]; 36838886Stegge 3691556Srgrimes if (curdir) 37038886Stegge return curdir; 37138886Stegge if (getcwd(buf, sizeof(buf)) == NULL) { 37238886Stegge char *pwd = getenv("PWD"); 37338886Stegge struct stat stdot, stpwd; 37438886Stegge 37538886Stegge if (pwd && *pwd == '/' && stat(".", &stdot) != -1 && 37638886Stegge stat(pwd, &stpwd) != -1 && 37738886Stegge stdot.st_dev == stpwd.st_dev && 37838886Stegge stdot.st_ino == stpwd.st_ino) { 37938886Stegge curdir = savestr(pwd); 38038886Stegge return curdir; 38138886Stegge } 38238886Stegge return NULL; 38338886Stegge } 38438886Stegge curdir = savestr(buf); 38538886Stegge 38638886Stegge return curdir; 3871556Srgrimes} 388