external/bsd/nvi/dist/ex/ex_cd.c

   1 /*      $NetBSD: ex_cd.c,v 1.3 2014/01/26 21:43:45 christos Exp $ */
   2 /*-
   3  * Copyright (c) 1992, 1993, 1994
   4  *      The Regents of the University of California.  All rights reserved.
   5  * Copyright (c) 1992, 1993, 1994, 1995, 1996
   6  *      Keith Bostic.  All rights reserved.
   7  *
   8  * See the LICENSE file for redistribution information.
   9  */
  10
  11 #include "config.h"
  12
  13 #include <sys/cdefs.h>
  14 #if 0
  15 #ifndef lint
  16 static const char sccsid[] = "Id: ex_cd.c,v 10.12 2001/06/25 15:19:14 skimo Exp  (Berkeley) Date: 2001/06/25 15:19:14 ";
  17 #endif /* not lint */
  18 #else
  19 __RCSID("$NetBSD: ex_cd.c,v 1.3 2014/01/26 21:43:45 christos Exp $");
  20 #endif
  21
  22 #include <sys/param.h>
  23 #include <sys/queue.h>
  24
  25 #include <bitstring.h>
  26 #include <errno.h>
  27 #include <limits.h>
  28 #include <pwd.h>
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <unistd.h>
  33
  34 #include "../common/common.h"
  35
  36 /*
  37  * ex_cd -- :cd[!] [directory]
  38  *      Change directories.
  39  *
  40  * PUBLIC: int ex_cd __P((SCR *, EXCMD *));
  41  */
  42 int
  43 ex_cd(SCR *sp, EXCMD *cmdp)
  44 {
  45         struct passwd *pw;
  46         ARGS *ap;
  47         const char *p, *t;      /* XXX: END OF THE STACK, DON'T TRUST GETCWD. */
  48         const char *dir;
  49         char buf[MAXPATHLEN * 2];
  50         size_t dlen;
  51
  52         /*
  53          * !!!
  54          * Historic practice is that the cd isn't attempted if the file has
  55          * been modified, unless its name begins with a leading '/' or the
  56          * force flag is set.
  57          */
  58         if (F_ISSET(sp->ep, F_MODIFIED) &&
  59             !FL_ISSET(cmdp->iflags, E_C_FORCE) && sp->frp->name[0] != '/') {
  60                 msgq(sp, M_ERR,
  61     "120|File modified since last complete write; write or use ! to override");
  62                 return (1);
  63         }
  64
  65         switch (cmdp->argc) {
  66         case 0:
  67                 /* If no argument, change to the user's home directory. */
  68                 if ((dir = getenv("HOME")) == NULL) {
  69                         if ((pw = getpwuid(getuid())) == NULL ||
  70                             pw->pw_dir == NULL || pw->pw_dir[0] == '\0') {
  71                                 msgq(sp, M_ERR,
  72                            "121|Unable to find home directory location");
  73                                 return (1);
  74                         }
  75                         dir = pw->pw_dir;
  76                 }
  77                 break;
  78         case 1:
  79                 INT2CHAR(sp, cmdp->argv[0]->bp, cmdp->argv[0]->len + 1,
  80                          dir, dlen);
  81                 break;
  82         default:
  83                 abort();
  84         }
  85
  86         /*
  87          * Try the current directory first.  If this succeeds, don't display
  88          * a message, vi didn't historically, and it should be obvious to the
  89          * user where they are.
  90          */
  91         if (!chdir(dir))
  92                 return (0);
  93
  94         /*
  95          * If moving to the user's home directory, or, the path begins with
  96          * "/", "./" or "../", it's the only place we try.
  97          */
  98         if (cmdp->argc == 0 ||
  99             (ap = cmdp->argv[0])->bp[0] == '/' ||
 100             (ap->len == 1 && ap->bp[0] == '.') ||
 101             (ap->len >= 2 && ap->bp[0] == '.' && ap->bp[1] == '.' &&
 102             (ap->bp[2] == '/' || ap->bp[2] == '\0')))
 103                 goto err;
 104
 105         /* Try the O_CDPATH option values. */
 106         for (p = t = O_STR(sp, O_CDPATH);; ++p)
 107                 if (*p == '\0' || *p == ':') {
 108                         /*
 109                          * Empty strings specify ".".  The only way to get an
 110                          * empty string is a leading colon, colons in a row,
 111                          * or a trailing colon.  Or, to put it the other way,
 112                          * if the length is 1 or less, then we're dealing with
 113                          * ":XXX", "XXX::XXXX" , "XXX:", or "".  Since we've
 114                          * already tried dot, we ignore tham all.
 115                          */
 116                         if (t < p - 1) {
 117                                 (void)snprintf(buf,
 118                                     sizeof(buf), "%.*s/%s", (int)(p - t),
 119                                         t, dir);
 120                                 if (!chdir(buf)) {
 121                                         if (getcwd(buf, sizeof(buf)) != NULL)
 122                 msgq_str(sp, M_INFO, buf, "122|New current directory: %s");
 123                                         return (0);
 124                                 }
 125                         }
 126                         t = p + 1;
 127                         if (*p == '\0')
 128                                 break;
 129                 }
 130
 131 err:    msgq_str(sp, M_SYSERR, dir, "%s");
 132         return (1);
 133 }