cd.c revision 223060
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 223060 2011-06-13 21:03:27Z 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" 66223060Sjilles#include "builtins.h" 671556Srgrimes 68213811Sobrienstatic int cdlogical(char *); 69213811Sobrienstatic int cdphysical(char *); 70213811Sobrienstatic int docd(char *, int, int); 71213811Sobrienstatic char *getcomponent(void); 72213811Sobrienstatic char *findcwd(char *); 73213811Sobrienstatic void updatepwd(char *); 74213811Sobrienstatic char *getpwd(void); 75213811Sobrienstatic char *getpwd2(void); 761556Srgrimes 77213760Sobrienstatic char *curdir = NULL; /* current working directory */ 78213760Sobrienstatic char *prevdir; /* previous working directory */ 79213760Sobrienstatic char *cdcomppath; 801556Srgrimes 811556Srgrimesint 8297092Stjrcdcmd(int argc, char **argv) 8317987Speter{ 84201053Sjilles const char *dest; 85200956Sjilles const char *path; 861556Srgrimes char *p; 871556Srgrimes struct stat statb; 88222154Sjilles int ch, phys, print = 0, getcwderr = 0; 89222154Sjilles int rc; 90222292Sjilles int errno1 = ENOENT; 911556Srgrimes 92100663Stjr optreset = 1; optind = 1; opterr = 0; /* initialize getopt */ 93100664Stjr phys = Pflag; 94222154Sjilles while ((ch = getopt(argc, argv, "eLP")) != -1) { 9597092Stjr switch (ch) { 96222154Sjilles case 'e': 97222154Sjilles getcwderr = 1; 98222154Sjilles break; 9997092Stjr case 'L': 10097092Stjr phys = 0; 10197092Stjr break; 10297092Stjr case 'P': 10397092Stjr phys = 1; 10497092Stjr break; 10597092Stjr default: 10697092Stjr error("unknown option: -%c", optopt); 10797092Stjr break; 10897092Stjr } 10997092Stjr } 11097092Stjr argc -= optind; 11197092Stjr argv += optind; 11297092Stjr 11397092Stjr if (argc > 1) 11497092Stjr error("too many arguments"); 11597092Stjr 11697092Stjr if ((dest = *argv) == NULL && (dest = bltinlookup("HOME", 1)) == NULL) 1171556Srgrimes error("HOME not set"); 1185234Sbde if (*dest == '\0') 1195234Sbde dest = "."; 1201556Srgrimes if (dest[0] == '-' && dest[1] == '\0') { 1211556Srgrimes dest = prevdir ? prevdir : curdir; 12212273Speter if (dest) 12312273Speter print = 1; 12412273Speter else 12512273Speter dest = "."; 1261556Srgrimes } 127222381Sjilles if (dest[0] == '/' || 128222381Sjilles (dest[0] == '.' && (dest[1] == '/' || dest[1] == '\0')) || 129222381Sjilles (dest[0] == '.' && dest[1] == '.' && (dest[2] == '/' || dest[2] == '\0')) || 130222381Sjilles (path = bltinlookup("CDPATH", 1)) == NULL) 1311556Srgrimes path = nullstr; 1321556Srgrimes while ((p = padvance(&path, dest)) != NULL) { 13317987Speter if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) { 1341556Srgrimes if (!print) { 1351556Srgrimes /* 1361556Srgrimes * XXX - rethink 1371556Srgrimes */ 13838886Stegge if (p[0] == '.' && p[1] == '/' && p[2] != '\0') 139159551Sstefanf print = strcmp(p + 2, dest); 140159551Sstefanf else 141159551Sstefanf print = strcmp(p, dest); 1421556Srgrimes } 143222154Sjilles rc = docd(p, print, phys); 144222154Sjilles if (rc >= 0) 145222154Sjilles return getcwderr ? rc : 0; 146222292Sjilles if (errno != ENOENT) 147222292Sjilles errno1 = errno; 1481556Srgrimes } 1491556Srgrimes } 150222292Sjilles error("%s: %s", dest, strerror(errno1)); 15117987Speter /*NOTREACHED*/ 15217987Speter return 0; 1531556Srgrimes} 1541556Srgrimes 1551556Srgrimes 1561556Srgrimes/* 15797092Stjr * Actually change the directory. In an interactive shell, print the 15820774Ssteve * directory name if "print" is nonzero. 1591556Srgrimes */ 160213811Sobrienstatic int 16197092Stjrdocd(char *dest, int print, int phys) 16220425Ssteve{ 163222154Sjilles int rc; 16497092Stjr 16597092Stjr TRACE(("docd(\"%s\", %d, %d) called\n", dest, print, phys)); 16697092Stjr 16797092Stjr /* If logical cd fails, fall back to physical. */ 168222154Sjilles if ((phys || (rc = cdlogical(dest)) < 0) && (rc = cdphysical(dest)) < 0) 16997092Stjr return (-1); 17097092Stjr 17197092Stjr if (print && iflag && curdir) 17297092Stjr out1fmt("%s\n", curdir); 17397092Stjr 174222154Sjilles return (rc); 17597092Stjr} 17697092Stjr 177213811Sobrienstatic int 17897092Stjrcdlogical(char *dest) 17997092Stjr{ 18038886Stegge char *p; 18138886Stegge char *q; 18238886Stegge char *component; 18338886Stegge struct stat statb; 18438886Stegge int first; 18538886Stegge int badstat; 18620425Ssteve 18738886Stegge /* 18838886Stegge * Check each component of the path. If we find a symlink or 18938886Stegge * something we can't stat, clear curdir to force a getcwd() 19038886Stegge * next time we get the value of the current directory. 19138886Stegge */ 19238886Stegge badstat = 0; 19338886Stegge cdcomppath = stalloc(strlen(dest) + 1); 19438886Stegge scopy(dest, cdcomppath); 19538886Stegge STARTSTACKSTR(p); 19638886Stegge if (*dest == '/') { 19738886Stegge STPUTC('/', p); 19838886Stegge cdcomppath++; 19938886Stegge } 20038886Stegge first = 1; 20138886Stegge while ((q = getcomponent()) != NULL) { 20238886Stegge if (q[0] == '\0' || (q[0] == '.' && q[1] == '\0')) 20338886Stegge continue; 20438886Stegge if (! first) 20538886Stegge STPUTC('/', p); 20638886Stegge first = 0; 20738886Stegge component = q; 208215783Sjilles STPUTS(q, p); 20938886Stegge if (equal(component, "..")) 21038886Stegge continue; 21138886Stegge STACKSTRNUL(p); 21297092Stjr if (lstat(stackblock(), &statb) < 0) { 21338886Stegge badstat = 1; 21438886Stegge break; 21538886Stegge } 21638886Stegge } 21738886Stegge 2181556Srgrimes INTOFF; 219176521Sstefanf if ((p = findcwd(badstat ? NULL : dest)) == NULL || chdir(p) < 0) { 2201556Srgrimes INTON; 22197092Stjr return (-1); 2221556Srgrimes } 223176521Sstefanf updatepwd(p); 2241556Srgrimes INTON; 22597092Stjr return (0); 2261556Srgrimes} 2271556Srgrimes 228213811Sobrienstatic int 22997092Stjrcdphysical(char *dest) 23097092Stjr{ 231176521Sstefanf char *p; 232222154Sjilles int rc = 0; 2331556Srgrimes 23497092Stjr INTOFF; 235215727Sjilles if (chdir(dest) < 0) { 23697092Stjr INTON; 23797092Stjr return (-1); 23897092Stjr } 239215727Sjilles p = findcwd(NULL); 240222154Sjilles if (p == NULL) { 241216622Sjilles warning("warning: failed to get name of current directory"); 242222154Sjilles rc = 1; 243222154Sjilles } 244176521Sstefanf updatepwd(p); 24597092Stjr INTON; 246222154Sjilles return (rc); 24797092Stjr} 24897092Stjr 2491556Srgrimes/* 2501556Srgrimes * Get the next component of the path name pointed to by cdcomppath. 2511556Srgrimes * This routine overwrites the string pointed to by cdcomppath. 2521556Srgrimes */ 253213811Sobrienstatic char * 25490111Simpgetcomponent(void) 25520774Ssteve{ 25625222Ssteve char *p; 2571556Srgrimes char *start; 2581556Srgrimes 2591556Srgrimes if ((p = cdcomppath) == NULL) 2601556Srgrimes return NULL; 2611556Srgrimes start = cdcomppath; 2621556Srgrimes while (*p != '/' && *p != '\0') 2631556Srgrimes p++; 2641556Srgrimes if (*p == '\0') { 2651556Srgrimes cdcomppath = NULL; 2661556Srgrimes } else { 2671556Srgrimes *p++ = '\0'; 2681556Srgrimes cdcomppath = p; 2691556Srgrimes } 2701556Srgrimes return start; 2711556Srgrimes} 2721556Srgrimes 2731556Srgrimes 274213811Sobrienstatic char * 275176521Sstefanffindcwd(char *dir) 27620774Ssteve{ 2771556Srgrimes char *new; 2781556Srgrimes char *p; 2791556Srgrimes 28038886Stegge /* 28138886Stegge * If our argument is NULL, we don't know the current directory 28238886Stegge * any more because we traversed a symbolic link or something 28338886Stegge * we couldn't stat(). 28438886Stegge */ 285199631Sstefanf if (dir == NULL || curdir == NULL) 286199631Sstefanf return getpwd2(); 2871556Srgrimes cdcomppath = stalloc(strlen(dir) + 1); 2881556Srgrimes scopy(dir, cdcomppath); 2891556Srgrimes STARTSTACKSTR(new); 2901556Srgrimes if (*dir != '/') { 291215783Sjilles STPUTS(curdir, new); 292215783Sjilles if (STTOPC(new) == '/') 2931556Srgrimes STUNPUTC(new); 2941556Srgrimes } 2951556Srgrimes while ((p = getcomponent()) != NULL) { 2961556Srgrimes if (equal(p, "..")) { 2971556Srgrimes while (new > stackblock() && (STUNPUTC(new), *new) != '/'); 2981556Srgrimes } else if (*p != '\0' && ! equal(p, ".")) { 2991556Srgrimes STPUTC('/', new); 300215783Sjilles STPUTS(p, new); 3011556Srgrimes } 3021556Srgrimes } 3031556Srgrimes if (new == stackblock()) 3041556Srgrimes STPUTC('/', new); 3051556Srgrimes STACKSTRNUL(new); 306176521Sstefanf return stackblock(); 307176521Sstefanf} 308176521Sstefanf 309176521Sstefanf/* 310176521Sstefanf * Update curdir (the name of the current directory) in response to a 311176521Sstefanf * cd command. We also call hashcd to let the routines in exec.c know 312176521Sstefanf * that the current directory has changed. 313176521Sstefanf */ 314213811Sobrienstatic void 315176521Sstefanfupdatepwd(char *dir) 316176521Sstefanf{ 317176521Sstefanf hashcd(); /* update command hash table */ 318176521Sstefanf 31938886Stegge if (prevdir) 32038886Stegge ckfree(prevdir); 32138886Stegge prevdir = curdir; 322215727Sjilles curdir = dir ? savestr(dir) : NULL; 32386176Stegge setvar("PWD", curdir, VEXPORT); 32486176Stegge setvar("OLDPWD", prevdir, VEXPORT); 3251556Srgrimes} 3261556Srgrimes 3271556Srgrimesint 328100660Stjrpwdcmd(int argc, char **argv) 32917987Speter{ 330199631Sstefanf char *p; 33197092Stjr int ch, phys; 3321556Srgrimes 333100663Stjr optreset = 1; optind = 1; opterr = 0; /* initialize getopt */ 334100664Stjr phys = Pflag; 33597092Stjr while ((ch = getopt(argc, argv, "LP")) != -1) { 33697092Stjr switch (ch) { 33797092Stjr case 'L': 33897092Stjr phys = 0; 33997092Stjr break; 34097092Stjr case 'P': 34197092Stjr phys = 1; 34297092Stjr break; 34397092Stjr default: 34497092Stjr error("unknown option: -%c", optopt); 34597092Stjr break; 34697092Stjr } 34797092Stjr } 34897092Stjr argc -= optind; 34997092Stjr argv += optind; 3501556Srgrimes 35197092Stjr if (argc != 0) 35297092Stjr error("too many arguments"); 35338886Stegge 35497092Stjr if (!phys && getpwd()) { 35597092Stjr out1str(curdir); 35697092Stjr out1c('\n'); 35797092Stjr } else { 358199631Sstefanf if ((p = getpwd2()) == NULL) 35997092Stjr error(".: %s", strerror(errno)); 360199631Sstefanf out1str(p); 36197092Stjr out1c('\n'); 36297092Stjr } 36338886Stegge 36497092Stjr return 0; 36597092Stjr} 36638886Stegge 3671556Srgrimes/* 368176521Sstefanf * Get the current directory and cache the result in curdir. 3691556Srgrimes */ 370213811Sobrienstatic char * 37190111Simpgetpwd(void) 37220425Ssteve{ 373176521Sstefanf char *p; 37438886Stegge 3751556Srgrimes if (curdir) 37638886Stegge return curdir; 377176521Sstefanf 378199631Sstefanf p = getpwd2(); 379176521Sstefanf if (p != NULL) 380176521Sstefanf curdir = savestr(p); 381176521Sstefanf 382176521Sstefanf return curdir; 383176521Sstefanf} 384176521Sstefanf 385199631Sstefanf#define MAXPWD 256 386199631Sstefanf 387176521Sstefanf/* 388176521Sstefanf * Return the current directory. 389176521Sstefanf */ 390213811Sobrienstatic char * 391199631Sstefanfgetpwd2(void) 392176521Sstefanf{ 393199631Sstefanf char *pwd; 394199631Sstefanf int i; 39538886Stegge 396199631Sstefanf for (i = MAXPWD;; i *= 2) { 397199631Sstefanf pwd = stalloc(i); 398199631Sstefanf if (getcwd(pwd, i) != NULL) 399176521Sstefanf return pwd; 400199631Sstefanf stunalloc(pwd); 401199631Sstefanf if (errno != ERANGE) 402199631Sstefanf break; 40338886Stegge } 404199631Sstefanf 405206759Sjilles return NULL; 406206759Sjilles} 407206759Sjilles 408206759Sjilles/* 409206759Sjilles * Initialize PWD in a new shell. 410206759Sjilles * If the shell is interactive, we need to warn if this fails. 411206759Sjilles */ 412206759Sjillesvoid 413206759Sjillespwd_init(int warn) 414206759Sjilles{ 415206759Sjilles char *pwd; 416206759Sjilles struct stat stdot, stpwd; 417206759Sjilles 418206759Sjilles pwd = lookupvar("PWD"); 419199631Sstefanf if (pwd && *pwd == '/' && stat(".", &stdot) != -1 && 420199631Sstefanf stat(pwd, &stpwd) != -1 && 421199631Sstefanf stdot.st_dev == stpwd.st_dev && 422199631Sstefanf stdot.st_ino == stpwd.st_ino) { 423206759Sjilles if (curdir) 424206759Sjilles ckfree(curdir); 425206759Sjilles curdir = savestr(pwd); 426199631Sstefanf } 427206759Sjilles if (getpwd() == NULL && warn) 428206759Sjilles out2fmt_flush("sh: cannot determine working directory\n"); 429206759Sjilles setvar("PWD", curdir, VEXPORT); 4301556Srgrimes} 431