cd.c revision 213760
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 * 4. Neither the name of the University nor the names of its contributors 171556Srgrimes * may be used to endorse or promote products derived from this software 181556Srgrimes * without specific prior written permission. 191556Srgrimes * 201556Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 211556Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 221556Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 231556Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 241556Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 251556Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 261556Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 271556Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 281556Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 291556Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 301556Srgrimes * SUCH DAMAGE. 311556Srgrimes */ 321556Srgrimes 331556Srgrimes#ifndef lint 3436150Scharnier#if 0 3536150Scharnierstatic char sccsid[] = "@(#)cd.c 8.2 (Berkeley) 5/4/95"; 3636150Scharnier#endif 371556Srgrimes#endif /* not lint */ 3899110Sobrien#include <sys/cdefs.h> 3999110Sobrien__FBSDID("$FreeBSD: head/bin/sh/cd.c 213760 2010-10-13 04:01:01Z obrien $"); 401556Srgrimes 4117987Speter#include <sys/types.h> 4217987Speter#include <sys/stat.h> 4317987Speter#include <stdlib.h> 4420425Ssteve#include <string.h> 4517987Speter#include <unistd.h> 4617987Speter#include <errno.h> 47100661Stjr#include <limits.h> 4817987Speter 491556Srgrimes/* 501556Srgrimes * The cd and pwd commands. 511556Srgrimes */ 521556Srgrimes 531556Srgrimes#include "shell.h" 541556Srgrimes#include "var.h" 551556Srgrimes#include "nodes.h" /* for jobs.h */ 561556Srgrimes#include "jobs.h" 571556Srgrimes#include "options.h" 581556Srgrimes#include "output.h" 591556Srgrimes#include "memalloc.h" 601556Srgrimes#include "error.h" 6120425Ssteve#include "exec.h" 6217987Speter#include "redir.h" 631556Srgrimes#include "mystring.h" 6417987Speter#include "show.h" 6520425Ssteve#include "cd.h" 661556Srgrimes 6797092StjrSTATIC int cdlogical(char *); 6897092StjrSTATIC int cdphysical(char *); 6997092StjrSTATIC int docd(char *, int, int); 7090111SimpSTATIC char *getcomponent(void); 71176521SstefanfSTATIC char *findcwd(char *); 72176521SstefanfSTATIC void updatepwd(char *); 73206759SjillesSTATIC char *getpwd(void); 74199631SstefanfSTATIC char *getpwd2(void); 751556Srgrimes 76213760Sobrienstatic char *curdir = NULL; /* current working directory */ 77213760Sobrienstatic char *prevdir; /* previous working directory */ 78213760Sobrienstatic char *cdcomppath; 791556Srgrimes 801556Srgrimesint 8197092Stjrcdcmd(int argc, char **argv) 8217987Speter{ 83201053Sjilles const char *dest; 84200956Sjilles const char *path; 851556Srgrimes char *p; 861556Srgrimes struct stat statb; 8797092Stjr int ch, phys, print = 0; 881556Srgrimes 89100663Stjr optreset = 1; optind = 1; opterr = 0; /* initialize getopt */ 90100664Stjr phys = Pflag; 9197092Stjr while ((ch = getopt(argc, argv, "LP")) != -1) { 9297092Stjr switch (ch) { 9397092Stjr case 'L': 9497092Stjr phys = 0; 9597092Stjr break; 9697092Stjr case 'P': 9797092Stjr phys = 1; 9897092Stjr break; 9997092Stjr default: 10097092Stjr error("unknown option: -%c", optopt); 10197092Stjr break; 10297092Stjr } 10397092Stjr } 10497092Stjr argc -= optind; 10597092Stjr argv += optind; 10697092Stjr 10797092Stjr if (argc > 1) 10897092Stjr error("too many arguments"); 10997092Stjr 11097092Stjr if ((dest = *argv) == NULL && (dest = bltinlookup("HOME", 1)) == NULL) 1111556Srgrimes error("HOME not set"); 1125234Sbde if (*dest == '\0') 1135234Sbde dest = "."; 1141556Srgrimes if (dest[0] == '-' && dest[1] == '\0') { 1151556Srgrimes dest = prevdir ? prevdir : curdir; 11612273Speter if (dest) 11712273Speter print = 1; 11812273Speter else 11912273Speter dest = "."; 1201556Srgrimes } 1211556Srgrimes if (*dest == '/' || (path = bltinlookup("CDPATH", 1)) == NULL) 1221556Srgrimes path = nullstr; 1231556Srgrimes while ((p = padvance(&path, dest)) != NULL) { 12417987Speter if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) { 1251556Srgrimes if (!print) { 1261556Srgrimes /* 1271556Srgrimes * XXX - rethink 1281556Srgrimes */ 12938886Stegge if (p[0] == '.' && p[1] == '/' && p[2] != '\0') 130159551Sstefanf print = strcmp(p + 2, dest); 131159551Sstefanf else 132159551Sstefanf 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; 207176521Sstefanf if ((p = findcwd(badstat ? NULL : dest)) == NULL || chdir(p) < 0) { 2081556Srgrimes INTON; 20997092Stjr return (-1); 2101556Srgrimes } 211176521Sstefanf updatepwd(p); 2121556Srgrimes INTON; 21397092Stjr return (0); 2141556Srgrimes} 2151556Srgrimes 21697092StjrSTATIC int 21797092Stjrcdphysical(char *dest) 21897092Stjr{ 219176521Sstefanf char *p; 2201556Srgrimes 22197092Stjr INTOFF; 222176521Sstefanf if (chdir(dest) < 0 || (p = findcwd(NULL)) == NULL) { 22397092Stjr INTON; 22497092Stjr return (-1); 22597092Stjr } 226176521Sstefanf updatepwd(p); 22797092Stjr INTON; 22897092Stjr return (0); 22997092Stjr} 23097092Stjr 2311556Srgrimes/* 2321556Srgrimes * Get the next component of the path name pointed to by cdcomppath. 2331556Srgrimes * This routine overwrites the string pointed to by cdcomppath. 2341556Srgrimes */ 2351556SrgrimesSTATIC char * 23690111Simpgetcomponent(void) 23720774Ssteve{ 23825222Ssteve char *p; 2391556Srgrimes char *start; 2401556Srgrimes 2411556Srgrimes if ((p = cdcomppath) == NULL) 2421556Srgrimes return NULL; 2431556Srgrimes start = cdcomppath; 2441556Srgrimes while (*p != '/' && *p != '\0') 2451556Srgrimes p++; 2461556Srgrimes if (*p == '\0') { 2471556Srgrimes cdcomppath = NULL; 2481556Srgrimes } else { 2491556Srgrimes *p++ = '\0'; 2501556Srgrimes cdcomppath = p; 2511556Srgrimes } 2521556Srgrimes return start; 2531556Srgrimes} 2541556Srgrimes 2551556Srgrimes 256176521SstefanfSTATIC char * 257176521Sstefanffindcwd(char *dir) 25820774Ssteve{ 2591556Srgrimes char *new; 2601556Srgrimes char *p; 2611556Srgrimes 26238886Stegge /* 26338886Stegge * If our argument is NULL, we don't know the current directory 26438886Stegge * any more because we traversed a symbolic link or something 26538886Stegge * we couldn't stat(). 26638886Stegge */ 267199631Sstefanf if (dir == NULL || curdir == NULL) 268199631Sstefanf return getpwd2(); 2691556Srgrimes cdcomppath = stalloc(strlen(dir) + 1); 2701556Srgrimes scopy(dir, cdcomppath); 2711556Srgrimes STARTSTACKSTR(new); 2721556Srgrimes if (*dir != '/') { 2731556Srgrimes p = curdir; 2741556Srgrimes while (*p) 2751556Srgrimes STPUTC(*p++, new); 2761556Srgrimes if (p[-1] == '/') 2771556Srgrimes STUNPUTC(new); 2781556Srgrimes } 2791556Srgrimes while ((p = getcomponent()) != NULL) { 2801556Srgrimes if (equal(p, "..")) { 2811556Srgrimes while (new > stackblock() && (STUNPUTC(new), *new) != '/'); 2821556Srgrimes } else if (*p != '\0' && ! equal(p, ".")) { 2831556Srgrimes STPUTC('/', new); 2841556Srgrimes while (*p) 2851556Srgrimes STPUTC(*p++, new); 2861556Srgrimes } 2871556Srgrimes } 2881556Srgrimes if (new == stackblock()) 2891556Srgrimes STPUTC('/', new); 2901556Srgrimes STACKSTRNUL(new); 291176521Sstefanf return stackblock(); 292176521Sstefanf} 293176521Sstefanf 294176521Sstefanf/* 295176521Sstefanf * Update curdir (the name of the current directory) in response to a 296176521Sstefanf * cd command. We also call hashcd to let the routines in exec.c know 297176521Sstefanf * that the current directory has changed. 298176521Sstefanf */ 299176521SstefanfSTATIC void 300176521Sstefanfupdatepwd(char *dir) 301176521Sstefanf{ 302176521Sstefanf hashcd(); /* update command hash table */ 303176521Sstefanf 30438886Stegge if (prevdir) 30538886Stegge ckfree(prevdir); 30638886Stegge prevdir = curdir; 307176521Sstefanf curdir = savestr(dir); 30886176Stegge setvar("PWD", curdir, VEXPORT); 30986176Stegge setvar("OLDPWD", prevdir, VEXPORT); 3101556Srgrimes} 3111556Srgrimes 3121556Srgrimesint 313100660Stjrpwdcmd(int argc, char **argv) 31417987Speter{ 315199631Sstefanf char *p; 31697092Stjr int ch, phys; 3171556Srgrimes 318100663Stjr optreset = 1; optind = 1; opterr = 0; /* initialize getopt */ 319100664Stjr phys = Pflag; 32097092Stjr while ((ch = getopt(argc, argv, "LP")) != -1) { 32197092Stjr switch (ch) { 32297092Stjr case 'L': 32397092Stjr phys = 0; 32497092Stjr break; 32597092Stjr case 'P': 32697092Stjr phys = 1; 32797092Stjr break; 32897092Stjr default: 32997092Stjr error("unknown option: -%c", optopt); 33097092Stjr break; 33197092Stjr } 33297092Stjr } 33397092Stjr argc -= optind; 33497092Stjr argv += optind; 3351556Srgrimes 33697092Stjr if (argc != 0) 33797092Stjr error("too many arguments"); 33838886Stegge 33997092Stjr if (!phys && getpwd()) { 34097092Stjr out1str(curdir); 34197092Stjr out1c('\n'); 34297092Stjr } else { 343199631Sstefanf if ((p = getpwd2()) == NULL) 34497092Stjr error(".: %s", strerror(errno)); 345199631Sstefanf out1str(p); 34697092Stjr out1c('\n'); 34797092Stjr } 34838886Stegge 34997092Stjr return 0; 35097092Stjr} 35138886Stegge 3521556Srgrimes/* 353176521Sstefanf * Get the current directory and cache the result in curdir. 3541556Srgrimes */ 355206759SjillesSTATIC char * 35690111Simpgetpwd(void) 35720425Ssteve{ 358176521Sstefanf char *p; 35938886Stegge 3601556Srgrimes if (curdir) 36138886Stegge return curdir; 362176521Sstefanf 363199631Sstefanf p = getpwd2(); 364176521Sstefanf if (p != NULL) 365176521Sstefanf curdir = savestr(p); 366176521Sstefanf 367176521Sstefanf return curdir; 368176521Sstefanf} 369176521Sstefanf 370199631Sstefanf#define MAXPWD 256 371199631Sstefanf 372176521Sstefanf/* 373176521Sstefanf * Return the current directory. 374176521Sstefanf */ 375176521SstefanfSTATIC char * 376199631Sstefanfgetpwd2(void) 377176521Sstefanf{ 378199631Sstefanf char *pwd; 379199631Sstefanf int i; 38038886Stegge 381199631Sstefanf for (i = MAXPWD;; i *= 2) { 382199631Sstefanf pwd = stalloc(i); 383199631Sstefanf if (getcwd(pwd, i) != NULL) 384176521Sstefanf return pwd; 385199631Sstefanf stunalloc(pwd); 386199631Sstefanf if (errno != ERANGE) 387199631Sstefanf break; 38838886Stegge } 389199631Sstefanf 390206759Sjilles return NULL; 391206759Sjilles} 392206759Sjilles 393206759Sjilles/* 394206759Sjilles * Initialize PWD in a new shell. 395206759Sjilles * If the shell is interactive, we need to warn if this fails. 396206759Sjilles */ 397206759Sjillesvoid 398206759Sjillespwd_init(int warn) 399206759Sjilles{ 400206759Sjilles char *pwd; 401206759Sjilles struct stat stdot, stpwd; 402206759Sjilles 403206759Sjilles pwd = lookupvar("PWD"); 404199631Sstefanf if (pwd && *pwd == '/' && stat(".", &stdot) != -1 && 405199631Sstefanf stat(pwd, &stpwd) != -1 && 406199631Sstefanf stdot.st_dev == stpwd.st_dev && 407199631Sstefanf stdot.st_ino == stpwd.st_ino) { 408206759Sjilles if (curdir) 409206759Sjilles ckfree(curdir); 410206759Sjilles curdir = savestr(pwd); 411199631Sstefanf } 412206759Sjilles if (getpwd() == NULL && warn) 413206759Sjilles out2fmt_flush("sh: cannot determine working directory\n"); 414206759Sjilles setvar("PWD", curdir, VEXPORT); 4151556Srgrimes} 416