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/* dir.c: directory operations.
Copyright 1992, 1993, 1994, 1995, 2008-2012 Karl Berry.
Copyright 2000, 2002, 2005 Olaf Weber.
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-dir.h>
#include <kpathsea/c-stat.h>
#include <kpathsea/hash.h>
#include <kpathsea/pathsearch.h>
/* Return true if FN is a directory or a symlink to a directory,
false if not. */
boolean
kpathsea_dir_p (kpathsea kpse, string fn)
{
/* FIXME : using the stat() replacement in gnuw32,
we could avoid this win32 specific code. However,
I wonder if it would be as fast as this one is ?
*/
#ifdef WIN32
int fa;
kpathsea_normalize_path(kpse, fn);
fa = GetFileAttributes(fn);
#ifdef KPSE_DEBUG
if (KPATHSEA_DEBUG_P (KPSE_DEBUG_STAT)) {
if (fa == 0xFFFFFFFF) {
fprintf(stderr, "failed to get file attributes for %s (%d)\n",
fn, (int)(GetLastError()));
} else {
fprintf(stderr, "path %s %s a directory\n",
fn , (fa & FILE_ATTRIBUTE_DIRECTORY) ?
"is" : "is not");
}
}
#endif /* KPSE_DEBUG */
return (fa != 0xFFFFFFFF && (fa & FILE_ATTRIBUTE_DIRECTORY));
#else /* !WIN32 */
struct stat stats;
return stat (fn, &stats) == 0 && S_ISDIR (stats.st_mode);
#endif /* !WIN32 */
}
#if defined(KPSE_COMPAT_API)
boolean
dir_p (string fn)
{
return kpathsea_dir_p (kpse_def, fn);
}
#endif
/*
Return -1 if FN isn't a directory, else its number of links.
Duplicate the call to stat; no need to incur overhead of a function
call for that little bit of cleanliness.
The process is a bit different under Win32 : the first call
memoizes the nlinks value, the following ones retrieve it.
*/
int
kpathsea_dir_links (kpathsea kpse, const_string fn, long nlinks)
{
const_string *hash_ret;
if (kpse->link_table.size == 0)
kpse->link_table = hash_create (457);
#ifdef KPSE_DEBUG
/* This is annoying, but since we're storing integers as pointers, we
can't print them as strings. */
if (KPATHSEA_DEBUG_P (KPSE_DEBUG_HASH))
kpse->debug_hash_lookup_int = true;
#endif
hash_ret = hash_lookup (kpse->link_table, fn);
#ifdef KPSE_DEBUG
if (KPATHSEA_DEBUG_P (KPSE_DEBUG_HASH))
kpse->debug_hash_lookup_int = false;
#endif
/* Have to cast the int we need to/from the const_string that the hash
table stores for values. Let's hope an int fits in a pointer. */
if (hash_ret) {
#ifdef WIN32
memcpy(&nlinks, hash_ret, sizeof(nlinks));
#else
nlinks = (long) *hash_ret;
#endif
} else {
#ifdef WIN32
/* Insert it only if we have some informations about it. */
if (nlinks) {
char str_nlinks[sizeof(nlinks)+1];
memcpy(str_nlinks, (char *)&nlinks, sizeof(nlinks));
str_nlinks[sizeof(nlinks)] = '\0';
/* It's up to us to copy the value. */
hash_insert(&(kpse->link_table), xstrdup (fn),
(const_string) str_nlinks);
}
#else
struct stat stats;
if (stat (fn, &stats) == 0 && S_ISDIR (stats.st_mode))
nlinks = stats.st_nlink;
else
nlinks = -1;
/* It's up to us to copy the value. */
hash_insert(&(kpse->link_table), xstrdup(fn), (const_string)nlinks);
#endif
#ifdef KPSE_DEBUG
if (KPATHSEA_DEBUG_P (KPSE_DEBUG_STAT))
DEBUGF2 ("dir_links(%s) => %ld\n", fn, nlinks);
#endif
}
/* In any case, return nlinks
(either 0, the value inserted or the value retrieved. */
return nlinks;
}
#if defined (KPSE_COMPAT_API)
int
dir_links (const_string fn, long nlinks)
{
return kpathsea_dir_links (kpse_def, fn, nlinks);
}
#endif
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