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/* dir.c: directory operations.
Copyright (C) 1992, 93, 94, 95, 2000 Free Software Foundation, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#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
dir_p P1C(const_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;
kpse_normalize_path((string)fn);
fa = GetFileAttributes(fn);
if (KPSE_DEBUG_P(KPSE_DEBUG_STAT)) {
if (fa == 0xFFFFFFFF) {
fprintf(stderr, "failed to get file attributes for %s (%d)\n",
fn, GetLastError());
} else {
fprintf(stderr, "path %s %s a directory\n",
fn , (fa & FILE_ATTRIBUTE_DIRECTORY) ?
"is" : "is not");
}
}
return (fa != 0xFFFFFFFF && (fa & FILE_ATTRIBUTE_DIRECTORY));
#else
struct stat stats;
return stat (fn, &stats) == 0 && S_ISDIR (stats.st_mode);
#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
dir_links P2C(const_string, fn, long, nlinks)
{
static hash_table_type link_table;
string *hash_ret;
if (link_table.size == 0)
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 (KPSE_DEBUG_P (KPSE_DEBUG_HASH))
kpse_debug_hash_lookup_int = true;
#endif
hash_ret = hash_lookup (link_table, fn);
#ifdef KPSE_DEBUG
if (KPSE_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(&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(&link_table, xstrdup(fn), (const_string)nlinks);
#endif
#ifdef KPSE_DEBUG
if (KPSE_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;
}
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