contrib/tcsh-6/sh.dir.c

   1 /* $Header: /p/tcsh/cvsroot/tcsh/sh.dir.c,v 3.82 2011/10/16 16:25:05 christos Exp $ */
   2 /*
   3  * sh.dir.c: Directory manipulation functions
   4  */
   5 /*-
   6  * Copyright (c) 1980, 1991 The Regents of the University of California.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33 #include "sh.h"
  34 #include "ed.h"
  35
  36 RCSID("$tcsh: sh.dir.c,v 3.82 2011/10/16 16:25:05 christos Exp $")
  37
  38 /*
  39  * C Shell - directory management
  40  */
  41
  42 static  Char                    *agetcwd        (void);
  43 static  void                     dstart         (const char *);
  44 static  struct directory        *dfind          (Char *);
  45 static  Char                    *dfollow        (Char *, int);
  46 static  void                     printdirs      (int);
  47 static  Char                    *dgoto          (Char *);
  48 static  void                     dnewcwd        (struct directory *, int);
  49 static  void                     dset           (Char *);
  50 static  void                     dextract       (struct directory *);
  51 static  int                      skipargs       (Char ***, const char *,
  52                                                  const char *);
  53 static  void                     dgetstack      (void);
  54
  55 static struct directory dhead INIT_ZERO_STRUCT;         /* "head" of loop */
  56 static int    printd;                   /* force name to be printed */
  57
  58 int     bequiet = 0;            /* do not print dir stack -strike */
  59
  60 static Char *
  61 agetcwd(void)
  62 {
  63     char *buf;
  64     Char *cwd;
  65     size_t len;
  66
  67     len = MAXPATHLEN;
  68     buf = xmalloc(len);
  69     while (getcwd(buf, len) == NULL) {
  70         int err;
  71
  72         err = errno;
  73         if (err != ERANGE) {
  74             xfree(buf);
  75             errno = err;
  76             return NULL;
  77         }
  78         len *= 2;
  79         buf = xrealloc(buf, len);
  80     }
  81     if (*buf == '\0') {
  82         xfree(buf);
  83         return NULL;
  84     }
  85     cwd = SAVE(buf);
  86     xfree(buf);
  87     return cwd;
  88 }
  89
  90 static void
  91 dstart(const char *from)
  92 {
  93     xprintf(CGETS(12, 1, "%s: Trying to start from \"%s\"\n"), progname, from);
  94 }
  95
  96 /*
  97  * dinit - initialize current working directory
  98  */
  99 void
 100 dinit(Char *hp)
 101 {
 102     Char *cp, *tcp;
 103     struct directory *dp;
 104
 105     /* Don't believe the login shell home, because it may be a symlink */
 106     tcp = agetcwd();
 107     if (tcp == NULL) {
 108         xprintf("%s: %s\n", progname, strerror(errno));
 109         if (hp && *hp) {
 110             char *xcp = short2str(hp);
 111             dstart(xcp);
 112             if (chdir(xcp) == -1)
 113                 cp = NULL;
 114             else
 115                 cp = Strsave(hp);
 116         }
 117         else
 118             cp = NULL;
 119         if (cp == NULL) {
 120             dstart("/");
 121             if (chdir("/") == -1)
 122                 /* I am not even try to print an error message! */
 123                 xexit(1);
 124             cp = SAVE("/");
 125         }
 126     }
 127     else {
 128 #ifdef S_IFLNK
 129         struct stat swd, shp;
 130         int swd_ok;
 131
 132         swd_ok = stat(short2str(tcp), &swd) == 0;
 133         /*
 134          * See if $HOME is the working directory we got and use that
 135          */
 136         if (swd_ok && hp && *hp && stat(short2str(hp), &shp) != -1 &&
 137             DEV_DEV_COMPARE(swd.st_dev, shp.st_dev)  &&
 138                 swd.st_ino == shp.st_ino)
 139             cp = Strsave(hp);
 140         else {
 141             char   *cwd;
 142
 143             /*
 144              * use PWD if we have it (for subshells)
 145              */
 146             if (swd_ok && (cwd = getenv("PWD")) != NULL) {
 147                 if (stat(cwd, &shp) != -1 &&
 148                         DEV_DEV_COMPARE(swd.st_dev, shp.st_dev) &&
 149                         swd.st_ino == shp.st_ino) {
 150                     tcp = SAVE(cwd);
 151                     cleanup_push(tcp, xfree);
 152                 }
 153             }
 154             cleanup_push(tcp, xfree);
 155             cp = dcanon(tcp, STRNULL);
 156             cleanup_ignore(tcp);
 157             cleanup_until(tcp);
 158         }
 159 #else /* S_IFLNK */
 160         cleanup_push(tcp, xfree);
 161         cp = dcanon(tcp, STRNULL);
 162         cleanup_ignore(tcp);
 163         cleanup_until(tcp);
 164 #endif /* S_IFLNK */
 165     }
 166
 167     dp = xcalloc(sizeof(struct directory), 1);
 168     dp->di_name = cp;
 169     dp->di_count = 0;
 170     dhead.di_next = dhead.di_prev = dp;
 171     dp->di_next = dp->di_prev = &dhead;
 172     printd = 0;
 173     dnewcwd(dp, 0);
 174     setcopy(STRdirstack, dp->di_name, VAR_READWRITE|VAR_NOGLOB);
 175 }
 176
 177 static void
 178 dset(Char *dp)
 179 {
 180     /*
 181      * Don't call set() directly cause if the directory contains ` or
 182      * other junk characters glob will fail.
 183      */
 184     setcopy(STRowd, varval(STRcwd), VAR_READWRITE|VAR_NOGLOB);
 185     setcopy(STRcwd, dp, VAR_READWRITE|VAR_NOGLOB);
 186     tsetenv(STRPWD, dp);
 187 }
 188
 189 #define DIR_PRINT       0x01    /* -p */
 190 #define DIR_LONG        0x02    /* -l */
 191 #define DIR_VERT        0x04    /* -v */
 192 #define DIR_LINE        0x08    /* -n */
 193 #define DIR_SAVE        0x10    /* -S */
 194 #define DIR_LOAD        0x20    /* -L */
 195 #define DIR_CLEAR       0x40    /* -c */
 196 #define DIR_OLD         0x80    /* - */
 197
 198 static int
 199 skipargs(Char ***v, const char *dstr, const char *str)
 200 {
 201     Char  **n = *v, *s;
 202
 203     int dflag = 0, loop = 1;
 204     for (n++; loop && *n != NULL && (*n)[0] == '-'; n++)
 205         if (*(s = &((*n)[1])) == '\0')  /* test for bare "-" argument */
 206             dflag |= DIR_OLD;
 207         else if ((*n)[1] == '-' && (*n)[2] == '\0') {   /* test for -- */
 208             n++;
 209             break;
 210         } else {
 211             char *p;
 212             while (*s != '\0')  /* examine flags */ {
 213                 if ((p = strchr(dstr, *s++)) != NULL)
 214                     dflag |= (1 << (p - dstr));
 215                 else
 216                     stderror(ERR_DIRUS, short2str(**v), dstr, str);
 217             }
 218         }
 219     if (*n && (dflag & DIR_OLD))
 220         stderror(ERR_DIRUS, short2str(**v), dstr, str);
 221     *v = n;
 222     /* make -l, -v, and -n imply -p */
 223     if (dflag & (DIR_LONG|DIR_VERT|DIR_LINE))
 224         dflag |= DIR_PRINT;
 225     return dflag;
 226 }
 227
 228 /*
 229  * dodirs - list all directories in directory loop
 230  */
 231 /*ARGSUSED*/
 232 void
 233 dodirs(Char **v, struct command *c)
 234 {
 235     static const char flags[] = "plvnSLc";
 236     int dflag = skipargs(&v, flags, "");
 237
 238     USE(c);
 239     if ((dflag & DIR_CLEAR) != 0) {
 240         struct directory *dp, *fdp;
 241         for (dp = dcwd->di_next; dp != dcwd; ) {
 242             fdp = dp;
 243             dp = dp->di_next;
 244             if (fdp != &dhead)
 245                 dfree(fdp);
 246         }
 247         dhead.di_next = dhead.di_prev = dp;
 248         dp->di_next = dp->di_prev = &dhead;
 249     }
 250     if ((dflag & DIR_LOAD) != 0)
 251         loaddirs(*v);
 252     else if ((dflag & DIR_SAVE) != 0)
 253         recdirs(*v, 1);
 254
 255     if (*v && (dflag & (DIR_SAVE|DIR_LOAD)))
 256         v++;
 257
 258     if (*v != NULL || (dflag & DIR_OLD))
 259         stderror(ERR_DIRUS, "dirs", flags, "");
 260     if ((dflag & (DIR_CLEAR|DIR_LOAD|DIR_SAVE)) == 0 || (dflag & DIR_PRINT))
 261         printdirs(dflag);
 262 }
 263
 264 static void
 265 printdirs(int dflag)
 266 {
 267     struct directory *dp;
 268     Char   *s, *user;
 269     int     idx, len, cur;
 270
 271     dp = dcwd;
 272     idx = 0;
 273     cur = 0;
 274     do {
 275         if (dp == &dhead)
 276             continue;
 277         if (dflag & DIR_VERT) {
 278             xprintf("%d\t", idx++);
 279             cur = 0;
 280         }
 281         s = dp->di_name;
 282         user = NULL;
 283         if (!(dflag & DIR_LONG) && (user = getusername(&s)) != NULL)
 284             len = (int) (Strlen(user) + Strlen(s) + 2);
 285         else
 286             len = (int) (Strlen(s) + 1);
 287
 288         cur += len;
 289         if ((dflag & DIR_LINE) && cur >= TermH - 1 && len < TermH) {
 290             xputchar('\n');
 291             cur = len;
 292         }
 293         if (user)
 294             xprintf("~%S", user);
 295         xprintf("%-S%c", s, (dflag & DIR_VERT) ? '\n' : ' ');
 296     } while ((dp = dp->di_prev) != dcwd);
 297     if (!(dflag & DIR_VERT))
 298         xputchar('\n');
 299 }
 300
 301 void
 302 dtildepr(Char *dir)
 303 {
 304     Char* user;
 305     if ((user = getusername(&dir)) != NULL)
 306         xprintf("~%-S%S", user, dir);
 307     else
 308         xprintf("%S", dir);
 309 }
 310
 311 void
 312 dtilde(void)
 313 {
 314     struct directory *d = dcwd;
 315
 316     do {
 317         if (d == &dhead)
 318             continue;
 319         d->di_name = dcanon(d->di_name, STRNULL);
 320     } while ((d = d->di_prev) != dcwd);
 321
 322     dset(dcwd->di_name);
 323 }
 324
 325
 326 /* dnormalize():
 327  *      The path will be normalized if it
 328  *      1) is "..",
 329  *      2) or starts with "../",
 330  *      3) or ends with "/..",
 331  *      4) or contains the string "/../",
 332  *      then it will be normalized, unless those strings are quoted.
 333  *      Otherwise, a copy is made and sent back.
 334  */
 335 Char   *
 336 dnormalize(const Char *cp, int expnd)
 337 {
 338
 339 /* return true if dp is of the form "../xxx" or "/../xxx" */
 340 #define IS_DOTDOT(sp, p) (ISDOTDOT(p) && ((p) == (sp) || *((p) - 1) == '/'))
 341 #define IS_DOT(sp, p) (ISDOT(p) && ((p) == (sp) || *((p) - 1) == '/'))
 342
 343 #ifdef S_IFLNK
 344     if (expnd) {
 345         struct Strbuf buf = Strbuf_INIT;
 346         int     dotdot = 0;
 347         Char   *dp, *cwd;
 348         const Char *start = cp;
 349 # ifdef HAVE_SLASHSLASH
 350         int slashslash;
 351 # endif /* HAVE_SLASHSLASH */
 352
 353         /*
 354          * count the number of "../xxx" or "xxx/../xxx" in the path
 355          */
 356         for ( ; *cp && *(cp + 1); cp++)
 357             if (IS_DOTDOT(start, cp))
 358                 dotdot++;
 359
 360         /*
 361          * if none, we are done.
 362          */
 363         if (dotdot == 0)
 364             return (Strsave(start));
 365
 366 # ifdef notdef
 367         struct stat sb;
 368         /*
 369          * We disable this test because:
 370          * cd /tmp; mkdir dir1 dir2; cd dir2; ln -s /tmp/dir1; cd dir1;
 371          * echo ../../dir1 does not expand. We had enabled this before
 372          * because it was bothering people with expansions in compilation
 373          * lines like -I../../foo. Maybe we need some kind of finer grain
 374          * control?
 375          *
 376          * If the path doesn't exist, we are done too.
 377          */
 378         if (lstat(short2str(start), &sb) != 0 && errno == ENOENT)
 379             return (Strsave(start));
 380 # endif
 381
 382         cwd = xmalloc((Strlen(dcwd->di_name) + 3) * sizeof(Char));
 383         (void) Strcpy(cwd, dcwd->di_name);
 384
 385         /*
 386          * If the path starts with a slash, we are not relative to
 387          * the current working directory.
 388          */
 389         if (ABSOLUTEP(start))
 390             *cwd = '\0';
 391 # ifdef HAVE_SLASHSLASH
 392         slashslash = cwd[0] == '/' && cwd[1] == '/';
 393 # endif /* HAVE_SLASHSLASH */
 394
 395         /*
 396          * Ignore . and count ..'s
 397          */
 398         cp = start;
 399         do {
 400             dotdot = 0;
 401             buf.len = 0;
 402             while (*cp)
 403                 if (IS_DOT(start, cp)) {
 404                     if (*++cp)
 405                         cp++;
 406                 }
 407                 else if (IS_DOTDOT(start, cp)) {
 408                     if (buf.len != 0)
 409                         break; /* finish analyzing .././../xxx/[..] */
 410                     dotdot++;
 411                     cp += 2;
 412                     if (*cp)
 413                         cp++;
 414                 }
 415                 else
 416                     Strbuf_append1(&buf, *cp++);
 417
 418             Strbuf_terminate(&buf);
 419             while (dotdot > 0)
 420                 if ((dp = Strrchr(cwd, '/')) != NULL) {
 421 # ifdef HAVE_SLASHSLASH
 422                     if (dp == &cwd[1])
 423                         slashslash = 1;
 424 # endif /* HAVE_SLASHSLASH */
 425                         *dp = '\0';
 426                         dotdot--;
 427                 }
 428                 else
 429                     break;
 430
 431             if (!*cwd) {        /* too many ..'s, starts with "/" */
 432                 cwd[0] = '/';
 433 # ifdef HAVE_SLASHSLASH
 434                 /*
 435                  * Only append another slash, if already the former cwd
 436                  * was in a double-slash path.
 437                  */
 438                 cwd[1] = slashslash ? '/' : '\0';
 439                 cwd[2] = '\0';
 440 # else /* !HAVE_SLASHSLASH */
 441                 cwd[1] = '\0';
 442 # endif /* HAVE_SLASHSLASH */
 443             }
 444 # ifdef HAVE_SLASHSLASH
 445             else if (slashslash && cwd[1] == '\0') {
 446                 cwd[1] = '/';
 447                 cwd[2] = '\0';
 448             }
 449 # endif /* HAVE_SLASHSLASH */
 450
 451             if (buf.len != 0) {
 452                 size_t i;
 453
 454                 i = Strlen(cwd);
 455                 if (TRM(cwd[i - 1]) != '/') {
 456                     cwd[i++] = '/';
 457                     cwd[i] = '\0';
 458                 }
 459                 dp = Strspl(cwd, TRM(buf.s[0]) == '/' ? &buf.s[1] : buf.s);
 460                 xfree(cwd);
 461                 cwd = dp;
 462                 i = Strlen(cwd) - 1;
 463                 if (TRM(cwd[i]) == '/')
 464                     cwd[i] = '\0';
 465             }
 466             /* Reduction of ".." following the stuff we collected in buf
 467              * only makes sense if the directory item in buf really exists.
 468              * Avoid reduction of "-I../.." (typical compiler call) to ""
 469              * or "/usr/nonexistant/../bin" to "/usr/bin":
 470              */
 471             if (cwd[0]) {
 472                 struct stat exists;
 473                 if (0 != stat(short2str(cwd), &exists)) {
 474                     xfree(buf.s);
 475                     xfree(cwd);
 476                     return Strsave(start);
 477                 }
 478             }
 479         } while (*cp != '\0');
 480         xfree(buf.s);
 481         return cwd;
 482     }
 483 #endif /* S_IFLNK */
 484     return Strsave(cp);
 485 }
 486
 487
 488 /*
 489  * dochngd - implement chdir command.
 490  */
 491 /*ARGSUSED*/
 492 void
 493 dochngd(Char **v, struct command *c)
 494 {
 495     Char *cp;
 496     struct directory *dp;
 497     int dflag = skipargs(&v, "plvn", "[-|<dir>]");
 498
 499     USE(c);
 500     printd = 0;
 501     cp = (dflag & DIR_OLD) ? varval(STRowd) : *v;
 502
 503     if (cp == NULL) {
 504         if ((cp = varval(STRhome)) == STRNULL || *cp == 0)
 505             stderror(ERR_NAME | ERR_NOHOMEDIR);
 506         if (chdir(short2str(cp)) < 0)
 507             stderror(ERR_NAME | ERR_CANTCHANGE);
 508         cp = Strsave(cp);
 509     }
 510     else if ((dflag & DIR_OLD) == 0 && v[1] != NULL) {
 511         stderror(ERR_NAME | ERR_TOOMANY);
 512         /* NOTREACHED */
 513         return;
 514     }
 515     else if ((dp = dfind(cp)) != 0) {
 516         char   *tmp;
 517
 518         printd = 1;
 519         if (chdir(tmp = short2str(dp->di_name)) < 0)
 520             stderror(ERR_SYSTEM, tmp, strerror(errno));
 521         dcwd->di_prev->di_next = dcwd->di_next;
 522         dcwd->di_next->di_prev = dcwd->di_prev;
 523         dfree(dcwd);
 524         dnewcwd(dp, dflag);
 525         return;
 526     }
 527     else
 528         if ((cp = dfollow(cp, dflag & DIR_OLD)) == NULL)
 529             return;
 530     dp = xcalloc(sizeof(struct directory), 1);
 531     dp->di_name = cp;
 532     dp->di_count = 0;
 533     dp->di_next = dcwd->di_next;
 534     dp->di_prev = dcwd->di_prev;
 535     dp->di_prev->di_next = dp;
 536     dp->di_next->di_prev = dp;
 537     dfree(dcwd);
 538     dnewcwd(dp, dflag);
 539 }
 540
 541 static Char *
 542 dgoto(Char *cp)
 543 {
 544     Char *dp, *ret;
 545
 546     if (!ABSOLUTEP(cp))
 547     {
 548         Char *p, *q;
 549         size_t cwdlen;
 550
 551         cwdlen = Strlen(dcwd->di_name);
 552         if (cwdlen == 1)        /* root */
 553             cwdlen = 0;
 554         dp = xmalloc((cwdlen + Strlen(cp) + 2) * sizeof(Char));
 555         for (p = dp, q = dcwd->di_name; (*p++ = *q++) != '\0';)
 556             continue;
 557         if (cwdlen)
 558             p[-1] = '/';
 559         else
 560             p--;                /* don't add a / after root */
 561         Strcpy(p, cp);
 562         xfree(cp);
 563         cp = dp;
 564         dp += cwdlen;
 565     }
 566     else
 567         dp = cp;
 568
 569 #if defined(WINNT_NATIVE)
 570     return agetcwd();
 571 #elif defined(__CYGWIN__)
 572     if (ABSOLUTEP(cp) && cp[1] == ':') { /* Only DOS paths are treated that way */
 573         return agetcwd();
 574     } else {
 575         cleanup_push(cp, xfree);
 576         ret = dcanon(cp, dp);
 577         cleanup_ignore(cp);
 578         cleanup_until(cp);
 579     }
 580 #else /* !WINNT_NATIVE */
 581     cleanup_push(cp, xfree);
 582     ret = dcanon(cp, dp);
 583     cleanup_ignore(cp);
 584     cleanup_until(cp);
 585 #endif /* WINNT_NATIVE */
 586     return ret;
 587 }
 588
 589 /*
 590  * dfollow - change to arg directory; fall back on cdpath if not valid
 591  */
 592 static Char *
 593 dfollow(Char *cp, int old)
 594 {
 595     Char *dp;
 596     struct varent *c;
 597     int serrno;
 598
 599     cp = old ? Strsave(cp) : globone(cp, G_ERROR);
 600     cleanup_push(cp, xfree);
 601 #ifdef apollo
 602     if (Strchr(cp, '`')) {
 603         char *dptr;
 604         if (chdir(dptr = short2str(cp)) < 0)
 605             stderror(ERR_SYSTEM, dptr, strerror(errno));
 606         dp = agetcwd();
 607         cleanup_push(dp, xfree);
 608         if (dp != NULL) {
 609             cleanup_until(cp);
 610             return dgoto(dp);
 611         }
 612         else
 613             stderror(ERR_SYSTEM, dptr, strerror(errno));
 614     }
 615 #endif /* apollo */
 616
 617     /*
 618      * if we are ignoring symlinks, try to fix relatives now.
 619      * if we are expading symlinks, it should be done by now.
 620      */
 621     dp = dnormalize(cp, symlinks == SYM_IGNORE);
 622     if (chdir(short2str(dp)) >= 0) {
 623         cleanup_until(cp);
 624         return dgoto(dp);
 625     }
 626     else {
 627         xfree(dp);
 628         if (chdir(short2str(cp)) >= 0) {
 629             cleanup_ignore(cp);
 630             cleanup_until(cp);
 631             return dgoto(cp);
 632         }
 633         else if (errno != ENOENT && errno != ENOTDIR) {
 634             int err;
 635
 636             err = errno;
 637             stderror(ERR_SYSTEM, short2str(cp), strerror(err));
 638         }
 639         serrno = errno;
 640     }
 641
 642     if (cp[0] != '/' && !prefix(STRdotsl, cp) && !prefix(STRdotdotsl, cp)
 643         && (c = adrof(STRcdpath)) && c->vec != NULL) {
 644         struct Strbuf buf = Strbuf_INIT;
 645         Char  **cdp;
 646
 647         for (cdp = c->vec; *cdp; cdp++) {
 648             size_t len = Strlen(*cdp);
 649             buf.len = 0;
 650             if (len > 0) {
 651                 Strbuf_append(&buf, *cdp);
 652                 if ((*cdp)[len - 1] != '/')
 653                     Strbuf_append1(&buf, '/');
 654             }
 655             Strbuf_append(&buf, cp);
 656             Strbuf_terminate(&buf);
 657             /*
 658              * We always want to fix the directory here
 659              * If we are normalizing symlinks
 660              */
 661             dp = dnormalize(buf.s, symlinks == SYM_IGNORE ||
 662                                    symlinks == SYM_EXPAND);
 663             if (chdir(short2str(dp)) >= 0) {
 664                 printd = 1;
 665                 xfree(buf.s);
 666                 cleanup_until(cp);
 667                 return dgoto(dp);
 668             }
 669             else if (chdir(short2str(cp)) >= 0) {
 670                 printd = 1;
 671                 xfree(dp);
 672                 xfree(buf.s);
 673                 cleanup_ignore(cp);
 674                 cleanup_until(cp);
 675                 return dgoto(cp);
 676             }
 677         }
 678         xfree(buf.s);
 679     }
 680     dp = varval(cp);
 681     if ((dp[0] == '/' || dp[0] == '.') && chdir(short2str(dp)) >= 0) {
 682         cleanup_until(cp);
 683         cp = Strsave(dp);
 684         printd = 1;
 685         return dgoto(cp);
 686     }
 687     /*
 688      * on login source of ~/.cshdirs, errors are eaten. the dir stack is all
 689      * directories we could get to.
 690      */
 691     if (!bequiet)
 692         stderror(ERR_SYSTEM, short2str(cp), strerror(serrno));
 693     cleanup_until(cp);
 694     return (NULL);
 695 }
 696
 697
 698 /*
 699  * dopushd - push new directory onto directory stack.
 700  *      with no arguments exchange top and second.
 701  *      with numeric argument (+n) bring it to top.
 702  */
 703 /*ARGSUSED*/
 704 void
 705 dopushd(Char **v, struct command *c)
 706 {
 707     struct directory *dp;
 708     Char *cp;
 709     int dflag = skipargs(&v, "plvn", " [-|<dir>|+<n>]");
 710
 711     USE(c);
 712     printd = 1;
 713     cp = (dflag & DIR_OLD) ? varval(STRowd) : *v;
 714
 715     if (cp == NULL) {
 716         if (adrof(STRpushdtohome)) {
 717             if ((cp = varval(STRhome)) == STRNULL || *cp == 0)
 718                 stderror(ERR_NAME | ERR_NOHOMEDIR);
 719             if (chdir(short2str(cp)) < 0)
 720                 stderror(ERR_NAME | ERR_CANTCHANGE);
 721             if ((cp = dfollow(cp, dflag & DIR_OLD)) == NULL)
 722                 return;
 723             dp = xcalloc(sizeof(struct directory), 1);
 724             dp->di_name = cp;
 725             dp->di_count = 0;
 726             dp->di_prev = dcwd;
 727             dp->di_next = dcwd->di_next;
 728             dcwd->di_next = dp;
 729             dp->di_next->di_prev = dp;
 730         }
 731         else {
 732             char   *tmp;
 733
 734             if ((dp = dcwd->di_prev) == &dhead)
 735                 dp = dhead.di_prev;
 736             if (dp == dcwd)
 737                 stderror(ERR_NAME | ERR_NODIR);
 738             if (chdir(tmp = short2str(dp->di_name)) < 0)
 739                 stderror(ERR_SYSTEM, tmp, strerror(errno));
 740             dp->di_prev->di_next = dp->di_next;
 741             dp->di_next->di_prev = dp->di_prev;
 742             dp->di_next = dcwd->di_next;
 743             dp->di_prev = dcwd;
 744             dcwd->di_next->di_prev = dp;
 745             dcwd->di_next = dp;
 746         }
 747     }
 748     else if ((dflag & DIR_OLD) == 0 && v[1] != NULL) {
 749         stderror(ERR_NAME | ERR_TOOMANY);
 750         /* NOTREACHED */
 751         return;
 752     }
 753     else if ((dp = dfind(cp)) != NULL) {
 754         char   *tmp;
 755
 756         if (chdir(tmp = short2str(dp->di_name)) < 0)
 757             stderror(ERR_SYSTEM, tmp, strerror(errno));
 758         /*
 759          * kfk - 10 Feb 1984 - added new "extraction style" pushd +n
 760          */
 761         if (adrof(STRdextract))
 762             dextract(dp);
 763     }
 764     else {
 765         Char *ccp;
 766
 767         if ((ccp = dfollow(cp, dflag & DIR_OLD)) == NULL)
 768             return;
 769         dp = xcalloc(sizeof(struct directory), 1);
 770         dp->di_name = ccp;
 771         dp->di_count = 0;
 772         dp->di_prev = dcwd;
 773         dp->di_next = dcwd->di_next;
 774         dcwd->di_next = dp;
 775         dp->di_next->di_prev = dp;
 776     }
 777     dnewcwd(dp, dflag);
 778 }
 779
 780 /*
 781  * dfind - find a directory if specified by numeric (+n) argument
 782  */
 783 static struct directory *
 784 dfind(Char *cp)
 785 {
 786     struct directory *dp;
 787     int i;
 788     Char *ep;
 789
 790     if (*cp++ != '+')
 791         return (0);
 792     for (ep = cp; Isdigit(*ep); ep++)
 793         continue;
 794     if (*ep)
 795         return (0);
 796     i = getn(cp);
 797     if (i <= 0)
 798         return (0);
 799     for (dp = dcwd; i != 0; i--) {
 800         if ((dp = dp->di_prev) == &dhead)
 801             dp = dp->di_prev;
 802         if (dp == dcwd)
 803             stderror(ERR_NAME | ERR_DEEP);
 804     }
 805     return (dp);
 806 }
 807
 808 /*
 809  * dopopd - pop a directory out of the directory stack
 810  *      with a numeric argument just discard it.
 811  */
 812 /*ARGSUSED*/
 813 void
 814 dopopd(Char **v, struct command *c)
 815 {
 816     Char *cp;
 817     struct directory *dp, *p = NULL;
 818     int dflag = skipargs(&v, "plvn", " [-|+<n>]");
 819
 820     USE(c);
 821     printd = 1;
 822     cp = (dflag & DIR_OLD) ? varval(STRowd) : *v;
 823
 824     if (cp == NULL)
 825         dp = dcwd;
 826     else if ((dflag & DIR_OLD) == 0 && v[1] != NULL) {
 827         stderror(ERR_NAME | ERR_TOOMANY);
 828         /* NOTREACHED */
 829         return;
 830     }
 831     else if ((dp = dfind(cp)) == 0)
 832         stderror(ERR_NAME | ERR_BADDIR);
 833     if (dp->di_prev == &dhead && dp->di_next == &dhead)
 834         stderror(ERR_NAME | ERR_EMPTY);
 835     if (dp == dcwd) {
 836         char   *tmp;
 837
 838         if ((p = dp->di_prev) == &dhead)
 839             p = dhead.di_prev;
 840         if (chdir(tmp = short2str(p->di_name)) < 0)
 841             stderror(ERR_SYSTEM, tmp, strerror(errno));
 842     }
 843     dp->di_prev->di_next = dp->di_next;
 844     dp->di_next->di_prev = dp->di_prev;
 845     dfree(dp);
 846     if (dp == dcwd) {
 847         dnewcwd(p, dflag);
 848     }
 849     else {
 850         printdirs(dflag);
 851     }
 852 }
 853
 854 /*
 855  * dfree - free the directory (or keep it if it still has ref count)
 856  */
 857 void
 858 dfree(struct directory *dp)
 859 {
 860
 861     if (dp->di_count != 0) {
 862         dp->di_next = dp->di_prev = 0;
 863     }
 864     else {
 865         xfree(dp->di_name);
 866         xfree(dp);
 867     }
 868 }
 869
 870 /*
 871  * dcanon - canonicalize the pathname, removing excess ./ and ../ etc.
 872  *      we are of course assuming that the file system is standardly
 873  *      constructed (always have ..'s, directories have links)
 874  */
 875 Char   *
 876 dcanon(Char *cp, Char *p)
 877 {
 878     Char *sp;
 879     Char *p1, *p2;      /* general purpose */
 880     int    slash;
 881 #ifdef HAVE_SLASHSLASH
 882     int    slashslash;
 883 #endif /* HAVE_SLASHSLASH */
 884     size_t  clen;
 885
 886 #ifdef S_IFLNK                  /* if we have symlinks */
 887     Char *mlink, *newcp;
 888     char *tlink;
 889     size_t cc;
 890 #endif /* S_IFLNK */
 891
 892     clen = Strlen(cp);
 893
 894     /*
 895      * christos: if the path given does not start with a slash prepend cwd. If
 896      * cwd does not start with a slash or the result would be too long try to
 897      * correct it.
 898      */
 899     if (!ABSOLUTEP(cp)) {
 900         Char *tmpdir;
 901         size_t  len;
 902
 903         p1 = varval(STRcwd);
 904         if (p1 == STRNULL || !ABSOLUTEP(p1)) {
 905             Char *new_cwd = agetcwd();
 906
 907             if (new_cwd == NULL) {
 908                 xprintf("%s: %s\n", progname, strerror(errno));
 909                 setcopy(STRcwd, str2short("/"), VAR_READWRITE|VAR_NOGLOB);
 910             }
 911             else
 912                 setv(STRcwd, new_cwd, VAR_READWRITE|VAR_NOGLOB);
 913             p1 = varval(STRcwd);
 914         }
 915         len = Strlen(p1);
 916         tmpdir = xmalloc((len + clen + 2) * sizeof (*tmpdir));
 917         (void) Strcpy(tmpdir, p1);
 918         (void) Strcat(tmpdir, STRslash);
 919         (void) Strcat(tmpdir, cp);
 920         xfree(cp);
 921         cp = p = tmpdir;
 922     }
 923
 924 #ifdef HAVE_SLASHSLASH
 925     slashslash = (cp[0] == '/' && cp[1] == '/');
 926 #endif /* HAVE_SLASHSLASH */
 927
 928     while (*p) {                /* for each component */
 929         sp = p;                 /* save slash address */
 930         while (*++p == '/')     /* flush extra slashes */
 931             continue;
 932         if (p != ++sp)
 933             for (p1 = sp, p2 = p; (*p1++ = *p2++) != '\0';)
 934                 continue;
 935         p = sp;                 /* save start of component */
 936         slash = 0;
 937         if (*p)
 938             while (*++p)        /* find next slash or end of path */
 939                 if (*p == '/') {
 940                     slash = 1;
 941                     *p = 0;
 942                     break;
 943                 }
 944
 945 #ifdef HAVE_SLASHSLASH
 946         if (&cp[1] == sp && sp[0] == '.' && sp[1] == '.' && sp[2] == '\0')
 947             slashslash = 1;
 948 #endif /* HAVE_SLASHSLASH */
 949         if (*sp == '\0') {      /* if component is null */
 950             if (--sp == cp)     /* if path is one char (i.e. /) */
 951                 break;
 952             else
 953                 *sp = '\0';
 954         }
 955         else if (sp[0] == '.' && sp[1] == 0) {
 956             if (slash) {
 957                 for (p1 = sp, p2 = p + 1; (*p1++ = *p2++) != '\0';)
 958                     continue;
 959                 p = --sp;
 960             }
 961             else if (--sp != cp)
 962                 *sp = '\0';
 963             else
 964                 sp[1] = '\0';
 965         }
 966         else if (sp[0] == '.' && sp[1] == '.' && sp[2] == 0) {
 967             /*
 968              * We have something like "yyy/xxx/..", where "yyy" can be null or
 969              * a path starting at /, and "xxx" is a single component. Before
 970              * compressing "xxx/..", we want to expand "yyy/xxx", if it is a
 971              * symbolic link.
 972              */
 973             *--sp = 0;          /* form the pathname for readlink */
 974 #ifdef S_IFLNK                  /* if we have symlinks */
 975             if (sp != cp && /* symlinks != SYM_IGNORE && */
 976                 (tlink = areadlink(short2str(cp))) != NULL) {
 977                 mlink = str2short(tlink);
 978                 xfree(tlink);
 979
 980                 if (slash)
 981                     *p = '/';
 982                 /*
 983                  * Point p to the '/' in "/..", and restore the '/'.
 984                  */
 985                 *(p = sp) = '/';
 986                 if (*mlink != '/') {
 987                     /*
 988                      * Relative path, expand it between the "yyy/" and the
 989                      * "/..". First, back sp up to the character past "yyy/".
 990                      */
 991                     while (*--sp != '/')
 992                         continue;
 993                     sp++;
 994                     *sp = 0;
 995                     /*
 996                      * New length is "yyy/" + mlink + "/.." and rest
 997                      */
 998                     p1 = newcp = xmalloc(((sp - cp) + Strlen(mlink) +
 999                                           Strlen(p) + 1) * sizeof(Char));
1000                     /*
1001                      * Copy new path into newcp
1002                      */
1003                     for (p2 = cp; (*p1++ = *p2++) != '\0';)
1004                         continue;
1005                     for (p1--, p2 = mlink; (*p1++ = *p2++) != '\0';)
1006                         continue;
1007                     for (p1--, p2 = p; (*p1++ = *p2++) != '\0';)
1008                         continue;
1009                     /*
1010                      * Restart canonicalization at expanded "/xxx".
1011                      */
1012                     p = sp - cp - 1 + newcp;
1013                 }
1014                 else {
1015                     newcp = Strspl(mlink, p);
1016                     /*
1017                      * Restart canonicalization at beginning
1018                      */
1019                     p = newcp;
1020                 }
1021                 xfree(cp);
1022                 cp = newcp;
1023 #ifdef HAVE_SLASHSLASH
1024                 slashslash = (cp[0] == '/' && cp[1] == '/');
1025 #endif /* HAVE_SLASHSLASH */
1026                 continue;       /* canonicalize the link */
1027             }
1028 #endif /* S_IFLNK */
1029             *sp = '/';
1030             if (sp != cp)
1031                 while (*--sp != '/')
1032                     continue;
1033             if (slash) {
1034                 for (p1 = sp + 1, p2 = p + 1; (*p1++ = *p2++) != '\0';)
1035                     continue;
1036                 p = sp;
1037             }
1038             else if (cp == sp)
1039                 *++sp = '\0';
1040             else
1041                 *sp = '\0';
1042         }
1043         else {                  /* normal dir name (not . or .. or nothing) */
1044
1045 #ifdef S_IFLNK                  /* if we have symlinks */
1046             if (sp != cp && symlinks == SYM_CHASE &&
1047                 (tlink = areadlink(short2str(cp))) != NULL) {
1048                 mlink = str2short(tlink);
1049                 xfree(tlink);
1050
1051                 /*
1052                  * restore the '/'.
1053                  */
1054                 if (slash)
1055                     *p = '/';
1056
1057                 /*
1058                  * point sp to p (rather than backing up).
1059                  */
1060                 sp = p;
1061
1062                 if (*mlink != '/') {
1063                     /*
1064                      * Relative path, expand it between the "yyy/" and the
1065                      * remainder. First, back sp up to the character past
1066                      * "yyy/".
1067                      */
1068                     while (*--sp != '/')
1069                         continue;
1070                     sp++;
1071                     *sp = 0;
1072                     /*
1073                      * New length is "yyy/" + mlink + "/.." and rest
1074                      */
1075                     p1 = newcp = xmalloc(((sp - cp) + Strlen(mlink) +
1076                                           Strlen(p) + 1) * sizeof(Char));
1077                     /*
1078                      * Copy new path into newcp
1079                      */
1080                     for (p2 = cp; (*p1++ = *p2++) != '\0';)
1081                         continue;
1082                     for (p1--, p2 = mlink; (*p1++ = *p2++) != '\0';)
1083                         continue;
1084                     for (p1--, p2 = p; (*p1++ = *p2++) != '\0';)
1085                         continue;
1086                     /*
1087                      * Restart canonicalization at expanded "/xxx".
1088                      */
1089                     p = sp - cp - 1 + newcp;
1090                 }
1091                 else {
1092                     newcp = Strspl(mlink, p);
1093                     /*
1094                      * Restart canonicalization at beginning
1095                      */
1096                     p = newcp;
1097                 }
1098                 xfree(cp);
1099                 cp = newcp;
1100 #ifdef HAVE_SLASHSLASH
1101                 slashslash = (cp[0] == '/' && cp[1] == '/');
1102 #endif /* HAVE_SLASHSLASH */
1103                 continue;       /* canonicalize the mlink */
1104             }
1105 #endif /* S_IFLNK */
1106             if (slash)
1107                 *p = '/';
1108         }
1109     }
1110
1111     /*
1112      * fix home...
1113      */
1114 #ifdef S_IFLNK
1115     p1 = varval(STRhome);
1116     cc = Strlen(p1);
1117     /*
1118      * See if we're not in a subdir of STRhome
1119      */
1120     if (p1 && *p1 == '/' && (Strncmp(p1, cp, cc) != 0 ||
1121         (cp[cc] != '/' && cp[cc] != '\0'))) {
1122         static ino_t home_ino = (ino_t) -1;
1123         static dev_t home_dev = (dev_t) -1;
1124         static Char *home_ptr = NULL;
1125         struct stat statbuf;
1126         int found;
1127         Char *copy;
1128
1129         /*
1130          * Get dev and ino of STRhome
1131          */
1132         if (home_ptr != p1 &&
1133             stat(short2str(p1), &statbuf) != -1) {
1134             home_dev = statbuf.st_dev;
1135             home_ino = statbuf.st_ino;
1136             home_ptr = p1;
1137         }
1138         /*
1139          * Start comparing dev & ino backwards
1140          */
1141         p2 = copy = Strsave(cp);
1142         found = 0;
1143         while (*p2 && stat(short2str(p2), &statbuf) != -1) {
1144             if (DEV_DEV_COMPARE(statbuf.st_dev, home_dev) &&
1145                         statbuf.st_ino == home_ino) {
1146                         found = 1;
1147                         break;
1148             }
1149             if ((sp = Strrchr(p2, '/')) != NULL)
1150                 *sp = '\0';
1151         }
1152         /*
1153          * See if we found it
1154          */
1155         if (*p2 && found) {
1156             /*
1157              * Use STRhome to make '~' work
1158              */
1159             newcp = Strspl(p1, cp + Strlen(p2));
1160             xfree(cp);
1161             cp = newcp;
1162         }
1163         xfree(copy);
1164     }
1165 #endif /* S_IFLNK */
1166
1167 #ifdef HAVE_SLASHSLASH
1168     if (slashslash) {
1169         if (cp[1] != '/') {
1170             p = xmalloc((Strlen(cp) + 2) * sizeof(Char));
1171             *p = '/';
1172             (void) Strcpy(&p[1], cp);
1173             xfree(cp);
1174             cp = p;
1175         }
1176     }
1177     if (cp[1] == '/' && cp[2] == '/') {
1178         for (p1 = &cp[1], p2 = &cp[2]; (*p1++ = *p2++) != '\0';)
1179             continue;
1180     }
1181 #endif /* HAVE_SLASHSLASH */
1182     return cp;
1183 }
1184
1185
1186 /*
1187  * dnewcwd - make a new directory in the loop the current one
1188  */
1189 static void
1190 dnewcwd(struct directory *dp, int dflag)
1191 {
1192     int print;
1193
1194     if (adrof(STRdunique)) {
1195         struct directory *dn;
1196
1197         for (dn = dhead.di_prev; dn != &dhead; dn = dn->di_prev)
1198             if (dn != dp && Strcmp(dn->di_name, dp->di_name) == 0) {
1199                 dn->di_next->di_prev = dn->di_prev;
1200                 dn->di_prev->di_next = dn->di_next;
1201                 dfree(dn);
1202                 break;
1203             }
1204     }
1205     dcwd = dp;
1206     dset(dcwd->di_name);
1207     dgetstack();
1208     print = printd;             /* if printd is set, print dirstack... */
1209     if (adrof(STRpushdsilent))  /* but pushdsilent overrides printd... */
1210         print = 0;
1211     if (dflag & DIR_PRINT)      /* but DIR_PRINT overrides pushdsilent... */
1212         print = 1;
1213     if (bequiet)                /* and bequiet overrides everything */
1214         print = 0;
1215     if (print)
1216         printdirs(dflag);
1217     cwd_cmd();                  /* PWP: run the defined cwd command */
1218 }
1219
1220 void
1221 dsetstack(void)
1222 {
1223     Char **cp;
1224     struct varent *vp;
1225     struct directory *dn, *dp;
1226
1227     if ((vp = adrof(STRdirstack)) == NULL || vp->vec == NULL)
1228         return;
1229
1230     /* Free the whole stack */
1231     while ((dn = dhead.di_prev) != &dhead) {
1232         dn->di_next->di_prev = dn->di_prev;
1233         dn->di_prev->di_next = dn->di_next;
1234         if (dn != dcwd)
1235             dfree(dn);
1236     }
1237
1238     /* thread the current working directory */
1239     dhead.di_prev = dhead.di_next = dcwd;
1240     dcwd->di_next = dcwd->di_prev = &dhead;
1241
1242     /* put back the stack */
1243     for (cp = vp->vec; cp && *cp && **cp; cp++) {
1244         dp = xcalloc(sizeof(struct directory), 1);
1245         dp->di_name = Strsave(*cp);
1246         dp->di_count = 0;
1247         dp->di_prev = dcwd;
1248         dp->di_next = dcwd->di_next;
1249         dcwd->di_next = dp;
1250         dp->di_next->di_prev = dp;
1251     }
1252     dgetstack();        /* Make $dirstack reflect the current state */
1253 }
1254
1255 static void
1256 dgetstack(void)
1257 {
1258     int i = 0;
1259     Char **dblk, **dbp;
1260     struct directory *dn;
1261
1262     if (adrof(STRdirstack) == NULL)
1263         return;
1264
1265     for (dn = dhead.di_prev; dn != &dhead; dn = dn->di_prev, i++)
1266         continue;
1267     dbp = dblk = xmalloc((i + 1) * sizeof(Char *));
1268     for (dn = dhead.di_prev; dn != &dhead; dn = dn->di_prev, dbp++)
1269          *dbp = Strsave(dn->di_name);
1270     *dbp = NULL;
1271     cleanup_push(dblk, blk_cleanup);
1272     setq(STRdirstack, dblk, &shvhed, VAR_READWRITE);
1273     cleanup_ignore(dblk);
1274     cleanup_until(dblk);
1275 }
1276
1277 /*
1278  * getstakd - added by kfk 17 Jan 1984
1279  * Support routine for the stack hack.  Finds nth directory in
1280  * the directory stack, or finds last directory in stack.
1281  */
1282 const Char *
1283 getstakd(int cnt)
1284 {
1285     struct directory *dp;
1286
1287     dp = dcwd;
1288     if (cnt < 0) {              /* < 0 ==> last dir requested. */
1289         dp = dp->di_next;
1290         if (dp == &dhead)
1291             dp = dp->di_next;
1292     }
1293     else {
1294         while (cnt-- > 0) {
1295             dp = dp->di_prev;
1296             if (dp == &dhead)
1297                 dp = dp->di_prev;
1298             if (dp == dcwd)
1299                 return NULL;
1300         }
1301     }
1302     return dp->di_name;
1303 }
1304
1305 /*
1306  * Karl Kleinpaste - 10 Feb 1984
1307  * Added dextract(), which is used in pushd +n.
1308  * Instead of just rotating the entire stack around, dextract()
1309  * lets the user have the nth dir extracted from its current
1310  * position, and pushes it onto the top.
1311  */
1312 static void
1313 dextract(struct directory *dp)
1314 {
1315     if (dp == dcwd)
1316         return;
1317     dp->di_next->di_prev = dp->di_prev;
1318     dp->di_prev->di_next = dp->di_next;
1319     dp->di_next = dcwd->di_next;
1320     dp->di_prev = dcwd;
1321     dp->di_next->di_prev = dp;
1322     dcwd->di_next = dp;
1323 }
1324
1325 static void
1326 bequiet_cleanup(void *dummy)
1327 {
1328     USE(dummy);
1329     bequiet = 0;
1330 }
1331
1332 void
1333 loaddirs(Char *fname)
1334 {
1335     static Char *loaddirs_cmd[] = { STRsource, NULL, NULL };
1336
1337     bequiet = 1;
1338     cleanup_push(&bequiet, bequiet_cleanup);
1339     if (fname)
1340         loaddirs_cmd[1] = fname;
1341     else if ((fname = varval(STRdirsfile)) != STRNULL)
1342         loaddirs_cmd[1] = fname;
1343     else
1344         loaddirs_cmd[1] = STRtildotdirs;
1345     dosource(loaddirs_cmd, NULL);
1346     cleanup_until(&bequiet);
1347 }
1348
1349 /*
1350  * create a file called ~/.cshdirs which has a sequence
1351  * of pushd commands which will restore the dir stack to
1352  * its state before exit/logout. remember that the order
1353  * is reversed in the file because we are pushing.
1354  * -strike
1355  */
1356 void
1357 recdirs(Char *fname, int def)
1358 {
1359     int     fp, ftmp, oldidfds;
1360     int     cdflag = 0;
1361     struct directory *dp;
1362     unsigned int    num;
1363     Char   *snum;
1364     struct Strbuf qname = Strbuf_INIT;
1365
1366     if (fname == NULL && !def)
1367         return;
1368
1369     if (fname == NULL) {
1370         if ((fname = varval(STRdirsfile)) == STRNULL)
1371             fname = Strspl(varval(STRhome), &STRtildotdirs[1]);
1372         else
1373             fname = Strsave(fname);
1374     }
1375     else
1376         fname = globone(fname, G_ERROR);
1377     cleanup_push(fname, xfree);
1378
1379     if ((fp = xcreat(short2str(fname), 0600)) == -1) {
1380         cleanup_until(fname);
1381         return;
1382     }
1383
1384     if ((snum = varval(STRsavedirs)) == STRNULL || snum[0] == '\0')
1385         num = (unsigned int) ~0;
1386     else
1387         num = (unsigned int) atoi(short2str(snum));
1388
1389     oldidfds = didfds;
1390     didfds = 0;
1391     ftmp = SHOUT;
1392     SHOUT = fp;
1393
1394     cleanup_push(&qname, Strbuf_cleanup);
1395     dp = dcwd->di_next;
1396     do {
1397         if (dp == &dhead)
1398             continue;
1399
1400         if (cdflag == 0) {
1401             cdflag = 1;
1402             xprintf("cd %S\n", quote_meta(&qname, dp->di_name));
1403         }
1404         else
1405             xprintf("pushd %S\n", quote_meta(&qname, dp->di_name));
1406
1407         if (num-- == 0)
1408             break;
1409
1410     } while ((dp = dp->di_next) != dcwd->di_next);
1411
1412     xclose(fp);
1413     SHOUT = ftmp;
1414     didfds = oldidfds;
1415     cleanup_until(fname);
1416 }