contrib/nvi2/ex/ex_cd.c

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