cd.c revision 222154
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 222154 2011-05-20 22:55:18Z jilles $"); 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 67213811Sobrienstatic int cdlogical(char *); 68213811Sobrienstatic int cdphysical(char *); 69213811Sobrienstatic int docd(char *, int, int); 70213811Sobrienstatic char *getcomponent(void); 71213811Sobrienstatic char *findcwd(char *); 72213811Sobrienstatic void updatepwd(char *); 73213811Sobrienstatic char *getpwd(void); 74213811Sobrienstatic 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; 87222154Sjilles int ch, phys, print = 0, getcwderr = 0; 88222154Sjilles int rc; 891556Srgrimes 90100663Stjr optreset = 1; optind = 1; opterr = 0; /* initialize getopt */ 91100664Stjr phys = Pflag; 92222154Sjilles while ((ch = getopt(argc, argv, "eLP")) != -1) { 9397092Stjr switch (ch) { 94222154Sjilles case 'e': 95222154Sjilles getcwderr = 1; 96222154Sjilles break; 9797092Stjr case 'L': 9897092Stjr phys = 0; 9997092Stjr break; 10097092Stjr case 'P': 10197092Stjr phys = 1; 10297092Stjr break; 10397092Stjr default: 10497092Stjr error("unknown option: -%c", optopt); 10597092Stjr break; 10697092Stjr } 10797092Stjr } 10897092Stjr argc -= optind; 10997092Stjr argv += optind; 11097092Stjr 11197092Stjr if (argc > 1) 11297092Stjr error("too many arguments"); 11397092Stjr 11497092Stjr if ((dest = *argv) == NULL && (dest = bltinlookup("HOME", 1)) == NULL) 1151556Srgrimes error("HOME not set"); 1165234Sbde if (*dest == '\0') 1175234Sbde dest = "."; 1181556Srgrimes if (dest[0] == '-' && dest[1] == '\0') { 1191556Srgrimes dest = prevdir ? prevdir : curdir; 12012273Speter if (dest) 12112273Speter print = 1; 12212273Speter else 12312273Speter dest = "."; 1241556Srgrimes } 1251556Srgrimes if (*dest == '/' || (path = bltinlookup("CDPATH", 1)) == NULL) 1261556Srgrimes path = nullstr; 1271556Srgrimes while ((p = padvance(&path, dest)) != NULL) { 12817987Speter if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) { 1291556Srgrimes if (!print) { 1301556Srgrimes /* 1311556Srgrimes * XXX - rethink 1321556Srgrimes */ 13338886Stegge if (p[0] == '.' && p[1] == '/' && p[2] != '\0') 134159551Sstefanf print = strcmp(p + 2, dest); 135159551Sstefanf else 136159551Sstefanf print = strcmp(p, dest); 1371556Srgrimes } 138222154Sjilles rc = docd(p, print, phys); 139222154Sjilles if (rc >= 0) 140222154Sjilles return getcwderr ? rc : 0; 1411556Srgrimes } 1421556Srgrimes } 1431556Srgrimes error("can't cd to %s", dest); 14417987Speter /*NOTREACHED*/ 14517987Speter return 0; 1461556Srgrimes} 1471556Srgrimes 1481556Srgrimes 1491556Srgrimes/* 15097092Stjr * Actually change the directory. In an interactive shell, print the 15120774Ssteve * directory name if "print" is nonzero. 1521556Srgrimes */ 153213811Sobrienstatic int 15497092Stjrdocd(char *dest, int print, int phys) 15520425Ssteve{ 156222154Sjilles int rc; 15797092Stjr 15897092Stjr TRACE(("docd(\"%s\", %d, %d) called\n", dest, print, phys)); 15997092Stjr 16097092Stjr /* If logical cd fails, fall back to physical. */ 161222154Sjilles if ((phys || (rc = cdlogical(dest)) < 0) && (rc = cdphysical(dest)) < 0) 16297092Stjr return (-1); 16397092Stjr 16497092Stjr if (print && iflag && curdir) 16597092Stjr out1fmt("%s\n", curdir); 16697092Stjr 167222154Sjilles return (rc); 16897092Stjr} 16997092Stjr 170213811Sobrienstatic int 17197092Stjrcdlogical(char *dest) 17297092Stjr{ 17338886Stegge char *p; 17438886Stegge char *q; 17538886Stegge char *component; 17638886Stegge struct stat statb; 17738886Stegge int first; 17838886Stegge int badstat; 17920425Ssteve 18038886Stegge /* 18138886Stegge * Check each component of the path. If we find a symlink or 18238886Stegge * something we can't stat, clear curdir to force a getcwd() 18338886Stegge * next time we get the value of the current directory. 18438886Stegge */ 18538886Stegge badstat = 0; 18638886Stegge cdcomppath = stalloc(strlen(dest) + 1); 18738886Stegge scopy(dest, cdcomppath); 18838886Stegge STARTSTACKSTR(p); 18938886Stegge if (*dest == '/') { 19038886Stegge STPUTC('/', p); 19138886Stegge cdcomppath++; 19238886Stegge } 19338886Stegge first = 1; 19438886Stegge while ((q = getcomponent()) != NULL) { 19538886Stegge if (q[0] == '\0' || (q[0] == '.' && q[1] == '\0')) 19638886Stegge continue; 19738886Stegge if (! first) 19838886Stegge STPUTC('/', p); 19938886Stegge first = 0; 20038886Stegge component = q; 201215783Sjilles STPUTS(q, p); 20238886Stegge if (equal(component, "..")) 20338886Stegge continue; 20438886Stegge STACKSTRNUL(p); 20597092Stjr if (lstat(stackblock(), &statb) < 0) { 20638886Stegge badstat = 1; 20738886Stegge break; 20838886Stegge } 20938886Stegge } 21038886Stegge 2111556Srgrimes INTOFF; 212176521Sstefanf if ((p = findcwd(badstat ? NULL : dest)) == NULL || chdir(p) < 0) { 2131556Srgrimes INTON; 21497092Stjr return (-1); 2151556Srgrimes } 216176521Sstefanf updatepwd(p); 2171556Srgrimes INTON; 21897092Stjr return (0); 2191556Srgrimes} 2201556Srgrimes 221213811Sobrienstatic int 22297092Stjrcdphysical(char *dest) 22397092Stjr{ 224176521Sstefanf char *p; 225222154Sjilles int rc = 0; 2261556Srgrimes 22797092Stjr INTOFF; 228215727Sjilles if (chdir(dest) < 0) { 22997092Stjr INTON; 23097092Stjr return (-1); 23197092Stjr } 232215727Sjilles p = findcwd(NULL); 233222154Sjilles if (p == NULL) { 234216622Sjilles warning("warning: failed to get name of current directory"); 235222154Sjilles rc = 1; 236222154Sjilles } 237176521Sstefanf updatepwd(p); 23897092Stjr INTON; 239222154Sjilles return (rc); 24097092Stjr} 24197092Stjr 2421556Srgrimes/* 2431556Srgrimes * Get the next component of the path name pointed to by cdcomppath. 2441556Srgrimes * This routine overwrites the string pointed to by cdcomppath. 2451556Srgrimes */ 246213811Sobrienstatic char * 24790111Simpgetcomponent(void) 24820774Ssteve{ 24925222Ssteve char *p; 2501556Srgrimes char *start; 2511556Srgrimes 2521556Srgrimes if ((p = cdcomppath) == NULL) 2531556Srgrimes return NULL; 2541556Srgrimes start = cdcomppath; 2551556Srgrimes while (*p != '/' && *p != '\0') 2561556Srgrimes p++; 2571556Srgrimes if (*p == '\0') { 2581556Srgrimes cdcomppath = NULL; 2591556Srgrimes } else { 2601556Srgrimes *p++ = '\0'; 2611556Srgrimes cdcomppath = p; 2621556Srgrimes } 2631556Srgrimes return start; 2641556Srgrimes} 2651556Srgrimes 2661556Srgrimes 267213811Sobrienstatic char * 268176521Sstefanffindcwd(char *dir) 26920774Ssteve{ 2701556Srgrimes char *new; 2711556Srgrimes char *p; 2721556Srgrimes 27338886Stegge /* 27438886Stegge * If our argument is NULL, we don't know the current directory 27538886Stegge * any more because we traversed a symbolic link or something 27638886Stegge * we couldn't stat(). 27738886Stegge */ 278199631Sstefanf if (dir == NULL || curdir == NULL) 279199631Sstefanf return getpwd2(); 2801556Srgrimes cdcomppath = stalloc(strlen(dir) + 1); 2811556Srgrimes scopy(dir, cdcomppath); 2821556Srgrimes STARTSTACKSTR(new); 2831556Srgrimes if (*dir != '/') { 284215783Sjilles STPUTS(curdir, new); 285215783Sjilles if (STTOPC(new) == '/') 2861556Srgrimes STUNPUTC(new); 2871556Srgrimes } 2881556Srgrimes while ((p = getcomponent()) != NULL) { 2891556Srgrimes if (equal(p, "..")) { 2901556Srgrimes while (new > stackblock() && (STUNPUTC(new), *new) != '/'); 2911556Srgrimes } else if (*p != '\0' && ! equal(p, ".")) { 2921556Srgrimes STPUTC('/', new); 293215783Sjilles STPUTS(p, new); 2941556Srgrimes } 2951556Srgrimes } 2961556Srgrimes if (new == stackblock()) 2971556Srgrimes STPUTC('/', new); 2981556Srgrimes STACKSTRNUL(new); 299176521Sstefanf return stackblock(); 300176521Sstefanf} 301176521Sstefanf 302176521Sstefanf/* 303176521Sstefanf * Update curdir (the name of the current directory) in response to a 304176521Sstefanf * cd command. We also call hashcd to let the routines in exec.c know 305176521Sstefanf * that the current directory has changed. 306176521Sstefanf */ 307213811Sobrienstatic void 308176521Sstefanfupdatepwd(char *dir) 309176521Sstefanf{ 310176521Sstefanf hashcd(); /* update command hash table */ 311176521Sstefanf 31238886Stegge if (prevdir) 31338886Stegge ckfree(prevdir); 31438886Stegge prevdir = curdir; 315215727Sjilles curdir = dir ? savestr(dir) : NULL; 31686176Stegge setvar("PWD", curdir, VEXPORT); 31786176Stegge setvar("OLDPWD", prevdir, VEXPORT); 3181556Srgrimes} 3191556Srgrimes 3201556Srgrimesint 321100660Stjrpwdcmd(int argc, char **argv) 32217987Speter{ 323199631Sstefanf char *p; 32497092Stjr int ch, phys; 3251556Srgrimes 326100663Stjr optreset = 1; optind = 1; opterr = 0; /* initialize getopt */ 327100664Stjr phys = Pflag; 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 { 351199631Sstefanf if ((p = getpwd2()) == NULL) 35297092Stjr error(".: %s", strerror(errno)); 353199631Sstefanf out1str(p); 35497092Stjr out1c('\n'); 35597092Stjr } 35638886Stegge 35797092Stjr return 0; 35897092Stjr} 35938886Stegge 3601556Srgrimes/* 361176521Sstefanf * Get the current directory and cache the result in curdir. 3621556Srgrimes */ 363213811Sobrienstatic char * 36490111Simpgetpwd(void) 36520425Ssteve{ 366176521Sstefanf char *p; 36738886Stegge 3681556Srgrimes if (curdir) 36938886Stegge return curdir; 370176521Sstefanf 371199631Sstefanf p = getpwd2(); 372176521Sstefanf if (p != NULL) 373176521Sstefanf curdir = savestr(p); 374176521Sstefanf 375176521Sstefanf return curdir; 376176521Sstefanf} 377176521Sstefanf 378199631Sstefanf#define MAXPWD 256 379199631Sstefanf 380176521Sstefanf/* 381176521Sstefanf * Return the current directory. 382176521Sstefanf */ 383213811Sobrienstatic char * 384199631Sstefanfgetpwd2(void) 385176521Sstefanf{ 386199631Sstefanf char *pwd; 387199631Sstefanf int i; 38838886Stegge 389199631Sstefanf for (i = MAXPWD;; i *= 2) { 390199631Sstefanf pwd = stalloc(i); 391199631Sstefanf if (getcwd(pwd, i) != NULL) 392176521Sstefanf return pwd; 393199631Sstefanf stunalloc(pwd); 394199631Sstefanf if (errno != ERANGE) 395199631Sstefanf break; 39638886Stegge } 397199631Sstefanf 398206759Sjilles return NULL; 399206759Sjilles} 400206759Sjilles 401206759Sjilles/* 402206759Sjilles * Initialize PWD in a new shell. 403206759Sjilles * If the shell is interactive, we need to warn if this fails. 404206759Sjilles */ 405206759Sjillesvoid 406206759Sjillespwd_init(int warn) 407206759Sjilles{ 408206759Sjilles char *pwd; 409206759Sjilles struct stat stdot, stpwd; 410206759Sjilles 411206759Sjilles pwd = lookupvar("PWD"); 412199631Sstefanf if (pwd && *pwd == '/' && stat(".", &stdot) != -1 && 413199631Sstefanf stat(pwd, &stpwd) != -1 && 414199631Sstefanf stdot.st_dev == stpwd.st_dev && 415199631Sstefanf stdot.st_ino == stpwd.st_ino) { 416206759Sjilles if (curdir) 417206759Sjilles ckfree(curdir); 418206759Sjilles curdir = savestr(pwd); 419199631Sstefanf } 420206759Sjilles if (getpwd() == NULL && warn) 421206759Sjilles out2fmt_flush("sh: cannot determine working directory\n"); 422206759Sjilles setvar("PWD", curdir, VEXPORT); 4231556Srgrimes} 424