/* tilde.c: expand user's home directories.

   Copyright 1997, 1998, 2005, Olaf Weber.
   Copyright 1993, 1995, 1996, 1997, 2008 Karl Berry.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with this library; if not, see <http://www.gnu.org/licenses/>.  */

#include <kpathsea/config.h>

#include <kpathsea/c-pathch.h>
#include <kpathsea/tilde.h>

#ifdef HAVE_PWD_H
#include <pwd.h>
#endif

#ifdef WIN32
#define HOMEVAR "USERPROFILE"
#else
#define HOMEVAR "HOME"
#endif

/* If NAME has a leading ~ or ~user, Unix-style, expand it to the user's
  home directory, and return a new malloced string.  If no ~, or no
  <pwd.h>, just return NAME.  */

string
kpathsea_tilde_expand (kpathsea kpse, string name)
{
 string expansion;
 const_string home;
 const_string prefix;

 (void)kpse; /* currenty not used */
 assert (name);

 /* If there is a leading "!!", set prefix to "!!", otherwise use
    the empty string.  After this, we can test whether a prefix was
    found by checking *prefix, and it is safe to unconditionally
    prepend it. */
 if (name[0] == '!' && name[1] == '!') {
   name += 2;
   prefix = "!!";
 } else {
   prefix = "";
 }

 /* If no leading tilde, do nothing, and return the original string.  */
 if (*name != '~') {
   if (*prefix)
     name -= 2;
   expansion = name;

 /* If a bare tilde, return the home directory or `.'.  (Very unlikely
    that the directory name will do anyone any good, but ...  */
 } else if (name[1] == 0) {
   home = getenv (HOMEVAR);
   if (!home) {
     home = ".";
   }
   expansion = concat (prefix, home);

 /* If `~/', remove any trailing / or replace leading // in $HOME.
    Should really check for doubled intermediate slashes, too.  */
 } else if (IS_DIR_SEP (name[1])) {
   unsigned c = 1;
   home = getenv (HOMEVAR);
   if (!home) {
     home = ".";
   }
   if (IS_DIR_SEP (*home) && IS_DIR_SEP (home[1])) {  /* handle leading // */
     home++;
   }
   if (IS_DIR_SEP (home[strlen (home) - 1])) {        /* omit / after ~ */
     c++;
   }
   expansion = concat3 (prefix, home, name + c);

 /* If `~user' or `~user/', look up user in the passwd database (but
    OS/2 doesn't have this concept.  */
 } else {
#ifdef HAVE_PWD_H
     struct passwd *p;
     string user;
     unsigned c = 2;
     while (!IS_DIR_SEP (name[c]) && name[c] != 0) /* find user name */
       c++;

     user = (string) xmalloc (c);
     strncpy (user, name + 1, c - 1);
     user[c - 1] = 0;

     /* We only need the cast here for (deficient) systems
        which do not declare `getpwnam' in <pwd.h>.  */
     p = (struct passwd *) getpwnam (user);
     free (user);

     /* If no such user, just use `.'.  */
     home = p ? p->pw_dir : ".";
     if (IS_DIR_SEP (*home) && IS_DIR_SEP (home[1])) { /* handle leading // */
       home++;
     }
     if (IS_DIR_SEP (home[strlen (home) - 1]) && name[c] != 0)
       c++; /* If HOME ends in /, omit the / after ~user. */

     expansion = concat3 (prefix, home, name + c);
#else /* not HAVE_PWD_H */
     /* Since we don't know how to look up a user name, just return the
        original string. */
     if (*prefix)
       name -= 2;
     expansion = name;
#endif /* not HAVE_PWD_H */
 }
 /* We may return the same thing as the original, and then we might not
    be returning a malloc-ed string.  Callers beware.  Sorry.  */
 return expansion;
}

#ifdef TEST

void
test_expand_tilde (const_string filename)
{
 string answer;

 printf ("Tilde expansion of `%s':\t", filename ? filename : "(nil)");
 answer = kpathsea_tilde_expand (kpse_def, (string)filename);
 puts (answer);
}

int
main (int argc, char **argv)
{
 string tilde_path = "tilde";
 kpse_set_program_name(argv[0],NULL);
 test_expand_tilde ("");
 test_expand_tilde ("none");
 test_expand_tilde ("~root");
 test_expand_tilde ("~");
 test_expand_tilde ("foo~bar");

 test_expand_tilde ("!!");
 test_expand_tilde ("!!none");
 test_expand_tilde ("!!~root");
 test_expand_tilde ("!!~");
 test_expand_tilde ("!!foo~bar");

 return 0;
}

#endif /* TEST */


/*
Local variables:
standalone-compile-command: "gcc -g -I. -I.. -DTEST tilde.c kpathsea.a"
End:
*/

You are viewing proxied material from ftp.icm.edu.pl. The copyright of proxied material belongs to its original authors. Any comments or complaints in relation to proxied material should be directed to the original authors of the content concerned. Please see the disclaimer for more details.