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+/*
+ * globbing.c: interface to the POSIX glob routines
+ *
+ * Copyright (C) 1995 Graeme W. Wilford. (Wilf.)
+ * Copyright (C) 2001, 2002, 2003, 2006, 2007, 2008 Colin Watson.
+ *
+ * This file is part of man-db.
+ *
+ * man-db is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * man-db 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with man-db; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * Mon Mar 13 20:27:36 GMT 1995 Wilf. (G.Wilford@ee.surrey.ac.uk)
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif /* HAVE_CONFIG_H */
+
+#include <string.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <glob.h>
+#include <sys/types.h>
+#include <dirent.h>
+
+#include "fnmatch.h"
+#include "regex.h"
+#include "xvasprintf.h"
+
+#include "manconfig.h"
+
+#include "error.h"
+#include "hashtable.h"
+#include "cleanup.h"
+#include "xregcomp.h"
+
+#include "globbing.h"
+
+const char *extension;
+static const char *mandir_layout = MANDIR_LAYOUT;
+
+static char *make_pattern (const char *name, const char *sec, int opts)
+{
+ char *pattern;
+
+ if (opts & LFF_REGEX) {
+ if (extension) {
+ char *esc_ext = escape_shell (extension);
+ pattern = xasprintf ("%s\\..*%s.*", name, esc_ext);
+ free (esc_ext);
+ } else {
+ char *esc_sec = escape_shell (sec);
+ pattern = xasprintf ("%s\\.%s.*", name, esc_sec);
+ free (esc_sec);
+ }
+ } else {
+ if (extension)
+ pattern = xasprintf ("%s.*%s*", name, extension);
+ else
+ pattern = xasprintf ("%s.%s*", name, sec);
+ }
+
+ return pattern;
+}
+
+#define LAYOUT_GNU 1
+#define LAYOUT_HPUX 2
+#define LAYOUT_IRIX 4
+#define LAYOUT_SOLARIS 8
+#define LAYOUT_BSD 16
+
+static int parse_layout (const char *layout)
+{
+ if (!*layout)
+ return LAYOUT_GNU | LAYOUT_HPUX | LAYOUT_IRIX |
+ LAYOUT_SOLARIS | LAYOUT_BSD;
+ else {
+ int flags = 0;
+
+ char *upper_layout = xstrdup (layout);
+ char *layoutp;
+ for (layoutp = upper_layout; *layoutp; layoutp++)
+ *layoutp = CTYPE (toupper, *layoutp);
+
+ if (strstr (upper_layout, "GNU"))
+ flags |= LAYOUT_GNU;
+ if (strstr (upper_layout, "HPUX"))
+ flags |= LAYOUT_HPUX;
+ if (strstr (upper_layout, "IRIX"))
+ flags |= LAYOUT_IRIX;
+ if (strstr (upper_layout, "SOLARIS"))
+ flags |= LAYOUT_SOLARIS;
+ if (strstr (upper_layout, "BSD"))
+ flags |= LAYOUT_BSD;
+
+ free (upper_layout);
+ return flags;
+ }
+}
+
+struct dirent_hashent {
+ char **names;
+ size_t names_len, names_max;
+};
+
+static void dirent_hashtable_free (void *defn)
+{
+ struct dirent_hashent *hashent = defn;
+ size_t i;
+
+ for (i = 0; i < hashent->names_len; ++i)
+ free (hashent->names[i]);
+ free (hashent->names);
+ free (hashent);
+}
+
+static struct hashtable *dirent_hash = NULL;
+
+static int cache_compare (const void *a, const void *b)
+{
+ const char *left = *(const char **) a;
+ const char *right = *(const char **) b;
+ return strcasecmp (left, right);
+}
+
+static struct dirent_hashent *update_directory_cache (const char *path)
+{
+ struct dirent_hashent *cache;
+ DIR *dir;
+ struct dirent *entry;
+
+ if (!dirent_hash) {
+ dirent_hash = hashtable_create (&dirent_hashtable_free);
+ push_cleanup ((cleanup_fun) hashtable_free, dirent_hash, 0);
+ }
+ cache = hashtable_lookup (dirent_hash, path, strlen (path));
+
+ /* Check whether we've got this one already. */
+ if (cache) {
+ debug ("update_directory_cache %s: hit\n", path);
+ return cache;
+ }
+
+ debug ("update_directory_cache %s: miss\n", path);
+
+ dir = opendir (path);
+ if (!dir) {
+ debug_error ("can't open directory %s", path);
+ return NULL;
+ }
+
+ cache = XMALLOC (struct dirent_hashent);
+ cache->names_len = 0;
+ cache->names_max = 1024;
+ cache->names = XNMALLOC (cache->names_max, char *);
+
+ /* Dump all the entries into cache->names, resizing if necessary. */
+ for (entry = readdir (dir); entry; entry = readdir (dir)) {
+ if (cache->names_len >= cache->names_max) {
+ cache->names_max *= 2;
+ cache->names =
+ xnrealloc (cache->names, cache->names_max,
+ sizeof (char *));
+ }
+ cache->names[cache->names_len++] = xstrdup (entry->d_name);
+ }
+
+ qsort (cache->names, cache->names_len, sizeof *cache->names,
+ &cache_compare);
+
+ hashtable_install (dirent_hash, path, strlen (path), cache);
+ closedir (dir);
+
+ return cache;
+}
+
+struct pattern_bsearch {
+ char *pattern;
+ size_t len;
+};
+
+static int pattern_compare (const void *a, const void *b)
+{
+ const struct pattern_bsearch *key = a;
+ const char *memb = *(const char **) b;
+ return strncasecmp (key->pattern, memb, key->len);
+}
+
+static void clear_glob (glob_t *pglob)
+{
+ /* look_for_file declares this static, so it's zero-initialised.
+ * globfree() can deal with checking it before freeing.
+ */
+ globfree (pglob);
+
+ pglob->gl_pathc = 0;
+ pglob->gl_pathv = NULL;
+ pglob->gl_offs = 0;
+}
+
+static void match_in_directory (const char *path, const char *pattern, int opts,
+ glob_t *pglob, size_t *allocated)
+{
+ struct dirent_hashent *cache;
+ size_t my_allocated = 0;
+ int flags;
+ regex_t preg;
+ struct pattern_bsearch pattern_start = { NULL, -1 };
+ char **bsearched;
+ size_t i;
+
+ if (!allocated)
+ allocated = &my_allocated;
+ if (!*allocated)
+ clear_glob (pglob);
+
+ cache = update_directory_cache (path);
+ if (!cache) {
+ debug ("directory cache update failed\n");
+ return;
+ }
+
+ debug ("globbing pattern in %s: %s\n", path, pattern);
+
+ if (!*allocated) {
+ *allocated = 4;
+ pglob->gl_pathv = XNMALLOC (*allocated, char *);
+ pglob->gl_pathv[0] = NULL;
+ }
+
+ if (opts & LFF_REGEX)
+ flags = REG_EXTENDED | REG_NOSUB |
+ ((opts & LFF_MATCHCASE) ? 0 : REG_ICASE);
+ else
+ flags = (opts & LFF_MATCHCASE) ? 0 : FNM_CASEFOLD;
+
+ if (opts & LFF_REGEX) {
+ xregcomp (&preg, pattern, flags);
+ bsearched = cache->names;
+ } else {
+ pattern_start.pattern = xstrndup (pattern,
+ strcspn (pattern, "?*{}\\"));
+ pattern_start.len = strlen (pattern_start.pattern);
+ bsearched = bsearch (&pattern_start, cache->names,
+ cache->names_len, sizeof *cache->names,
+ &pattern_compare);
+ if (!bsearched) {
+ free (pattern_start.pattern);
+ return;
+ }
+ while (bsearched > cache->names &&
+ !strncasecmp (pattern_start.pattern, *(bsearched - 1),
+ pattern_start.len))
+ --bsearched;
+ }
+
+ for (i = bsearched - cache->names; i < cache->names_len; ++i) {
+ if (opts & LFF_REGEX) {
+ if (regexec (&preg, cache->names[i], 0, NULL, 0) != 0)
+ continue;
+ } else {
+ if (strncasecmp (pattern_start.pattern,
+ cache->names[i], pattern_start.len))
+ break;
+
+ if (fnmatch (pattern, cache->names[i], flags) != 0)
+ continue;
+ }
+
+ debug ("matched: %s/%s\n", path, cache->names[i]);
+
+ if (pglob->gl_pathc >= *allocated) {
+ *allocated *= 2;
+ pglob->gl_pathv = xnrealloc (
+ pglob->gl_pathv, *allocated, sizeof (char *));
+ }
+ pglob->gl_pathv[pglob->gl_pathc++] =
+ xasprintf ("%s/%s", path, cache->names[i]);
+ }
+
+ if (opts & LFF_REGEX)
+ regfree (&preg);
+ else
+ free (pattern_start.pattern);
+
+ if (pglob->gl_pathc >= *allocated) {
+ *allocated *= 2;
+ pglob->gl_pathv = xnrealloc (pglob->gl_pathv,
+ *allocated, sizeof (char *));
+ }
+ pglob->gl_pathv[pglob->gl_pathc] = NULL;
+
+ return;
+}
+
+char **look_for_file (const char *hier, const char *sec,
+ const char *unesc_name, int cat, int opts)
+{
+ char *pattern, *path = NULL;
+ static glob_t gbuf;
+ static int cleanup_installed = 0;
+ static int layout = -1;
+ char *name;
+
+ if (!cleanup_installed) {
+ /* appease valgrind */
+ push_cleanup ((cleanup_fun) globfree, &gbuf, 0);
+ cleanup_installed = 1;
+ }
+
+ clear_glob (&gbuf);
+
+ /* This routine only does a minimum amount of matching. It does not
+ find cat files in the alternate cat directory. */
+
+ if (layout == -1) {
+ layout = parse_layout (mandir_layout);
+ debug ("Layout is %s (%d)\n", mandir_layout, layout);
+ }
+
+ if (opts & (LFF_REGEX | LFF_WILDCARD))
+ name = xstrdup (unesc_name);
+ else
+ name = escape_shell (unesc_name);
+
+ /* allow lookups like "3x foo" to match "../man3/foo.3x" */
+
+ if (layout & LAYOUT_GNU) {
+ glob_t dirs;
+ size_t i;
+ size_t allocated = 0;
+
+ memset (&dirs, 0, sizeof (dirs));
+ pattern = xasprintf ("%s\t*", cat ? "cat" : "man");
+ *strrchr (pattern, '\t') = *sec;
+ match_in_directory (hier, pattern, LFF_MATCHCASE, &dirs, NULL);
+ free (pattern);
+
+ pattern = make_pattern (name, sec, opts);
+ for (i = 0; i < dirs.gl_pathc; ++i) {
+ if (path)
+ *path = '\0';
+ match_in_directory (dirs.gl_pathv[i], pattern, opts,
+ &gbuf, &allocated);
+ }
+ free (pattern);
+ globfree (&dirs);
+ }
+
+ /* Try HPUX style compressed man pages */
+ if ((layout & LAYOUT_HPUX) && gbuf.gl_pathc == 0) {
+ if (path)
+ *path = '\0';
+ path = appendstr (path, hier, cat ? "/cat" : "/man",
+ sec, ".Z", (void *) 0);
+ pattern = make_pattern (name, sec, opts);
+
+ match_in_directory (path, pattern, opts, &gbuf, NULL);
+ free (pattern);
+ }
+
+ /* Try man pages without the section extension --- IRIX man pages */
+ if ((layout & LAYOUT_IRIX) && gbuf.gl_pathc == 0) {
+ if (path)
+ *path = '\0';
+ path = appendstr (path, hier, cat ? "/cat" : "/man", sec,
+ (void *) 0);
+ if (opts & LFF_REGEX)
+ pattern = xasprintf ("%s\\..*", name);
+ else
+ pattern = xasprintf ("%s.*", name);
+
+ match_in_directory (path, pattern, opts, &gbuf, NULL);
+ free (pattern);
+ }
+
+ /* Try Solaris style man page directories */
+ if ((layout & LAYOUT_SOLARIS) && gbuf.gl_pathc == 0) {
+ if (path)
+ *path = '\0';
+ /* TODO: This needs to be man/sec*, not just man/sec. */
+ path = appendstr (path, hier, cat ? "/cat" : "/man", sec,
+ (void *) 0);
+ pattern = make_pattern (name, sec, opts);
+
+ match_in_directory (path, pattern, opts, &gbuf, NULL);
+ free (pattern);
+ }
+
+ /* BSD cat pages take the extension .0 */
+ if ((layout & LAYOUT_BSD) && gbuf.gl_pathc == 0) {
+ if (path)
+ *path = '\0';
+ if (cat) {
+ path = appendstr (path, hier, "/cat", sec, (void *) 0);
+ if (opts & LFF_REGEX)
+ pattern = xasprintf ("%s\\.0.*", name);
+ else
+ pattern = xasprintf ("%s.0*", name);
+ } else {
+ path = appendstr (path, hier, "/man", sec, (void *) 0);
+ pattern = make_pattern (name, sec, opts);
+ }
+ match_in_directory (path, pattern, opts, &gbuf, NULL);
+ free (pattern);
+ }
+
+ free (name);
+ free (path);
+
+ if (gbuf.gl_pathc == 0)
+ return NULL;
+ else
+ return gbuf.gl_pathv;
+}
+
+char **expand_path (const char *path)
+{
+ int res = 0;
+ char **result = NULL;
+ glob_t globbuf;
+ size_t i;
+
+ res = glob (path, GLOB_NOCHECK, NULL, &globbuf);
+ /* if glob failed, return the given path */
+ if (res != 0) {
+ result = XNMALLOC (2, char *);
+ result[0] = xstrdup (path);
+ result[1] = NULL;
+ return result;
+ }
+
+ result = XNMALLOC (globbuf.gl_pathc + 1, char *);
+ for (i = 0; i < globbuf.gl_pathc; i++) {
+ result[i] = xstrdup (globbuf.gl_pathv[i]);
+ }
+ result[globbuf.gl_pathc] = NULL;
+
+ globfree (&globbuf);
+
+ return result;
+}
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