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/* tilde.c: Expand user's home directories.
Copyright 1997, 98, 2005, Olaf Weber.
Copyright 1993, 95, 96, 97 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, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <kpathsea/config.h>
#include <kpathsea/c-pathch.h>
#include <kpathsea/tilde.h>
#ifdef HAVE_PWD_H
#include <pwd.h>
#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
kpse_tilde_expand P1C(const_string, name)
{
const_string expansion;
const_string home;
const_string prefix;
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 ("HOME");
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 ("HOME");
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 (string) expansion;
}
#ifdef TEST
void
test_expand_tilde (const_string filename)
{
string answer;
printf ("Tilde expansion of `%s':\t", filename ? filename : "(nil)");
answer = kpse_tilde_expand (filename);
puts (answer);
}
int
main ()
{
string tilde_path = "tilde";
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:
*/
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