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/* tilde.c: expand user's home directories.
Copyright 1997, 1998, 2005, Olaf Weber.
Copyright 1993, 1995, 1996, 1997, 2008, 2011, 2016 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>
#undef USE_GETPWNAM
#ifdef HAVE_PWD_H
#include <pwd.h>
#define USE_GETPWNAM 1
#elif defined (WIN32) && !defined (__MINGW32__)
#define USE_GETPWNAM 1
#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;
#if defined(WIN32)
string p;
#endif
(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 != '~'
#ifndef USE_GETPWNAM
/* Same for `~user' or `~user/', but no passwd database. */
|| (name[1] && !IS_DIR_SEP (name[1]))
#endif
) {
if (*prefix)
name -= 2;
expansion = name;
} else {
/* If a bare tilde, return the home directory or `.'; if just `~user',
return that user's home directory or `.'. Very unlikely that the
directory name will do anyone any good, but ... */
unsigned c;
#ifdef USE_GETPWNAM
/* If `~user' or `~user/', look up user in the passwd database. */
if (name[1] && !IS_DIR_SEP (name[1])) {
struct passwd *p;
string user;
c = 2;
while (!IS_DIR_SEP (name[c]) && name[c] != 0) { /* find user name */
#if defined(WIN32)
if (kpathsea_IS_KANJI(kpse, name+c))
c++;
#endif
c++;
}
user = (string) xmalloc (c);
strncpy (user, name + 1, c - 1);
user[c - 1] = 0;
#if defined(WIN32) && !defined(__MINGW32__)
p = kpathsea_getpwnam (kpse, user);
#else
/* We only need the cast here for (deficient) systems
which do not declare `getpwnam' in <pwd.h>. */
p = (struct passwd *) getpwnam (user);
#endif
free (user);
/* If no such user, just use `.'. */
home = p ? p->pw_dir : ".";
} else
#endif /* USE_GETPWNAM */
{
c = 1;
home = getenv (HOMEVAR);
if (!home)
home = ".";
}
/* handle leading // */
if (IS_DIR_SEP (*home) && IS_DIR_SEP (home[1]))
home++;
/* If HOME ends in /, omit the / in ~/ or ~user/. */
if (name[c]) {
#if defined(WIN32)
const_string q;
for (q = home; *q; q++) {
if (IS_DIR_SEP (*q) && q[1] == 0)
c++;
else if (kpathsea_IS_KANJI(kpse, q))
q++;
}
#else
if (IS_DIR_SEP (home[strlen (home) - 1]))
c++;
#endif
}
expansion = concat3 (prefix, home, name + c);
}
#if defined(WIN32)
for (p = expansion; *p; p++) {
if (*p == '\\')
*p = '/';
else if (kpathsea_IS_KANJI(kpse, p))
p++;
}
#endif
/* 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:
*/
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