Revert "Delete unused file."

This reverts commit 2a8c3e471aef17b6841451d471a84b0937dcf8bf.

lib.cpp was not unused at all. Thanks to Manpreet Singh for noticing.

diff --git a/lib.cpp b/lib.cpp
new file mode 100644 (file)
index 0000000..83a9692
--- /dev/null
+++ b/lib.cpp
@@ -0,0 +1,92 @@
+/* Common functions.
+
+Copyright (C) 2005, 2007 Red Hat, Inc. All rights reserved.
+This copyrighted material is made available to anyone wishing to use, modify,
+copy, or redistribute it subject to the terms and conditions of the GNU General
+Public License v.2.
+
+This program 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
+this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
+Street, Fifth Floor, Boston, MA 02110-1301, USA.
+
+Author: Miloslav Trmac <mitr@redhat.com>
+
+plocate modifications: Copyright (C) 2020 Steinar H. Gunderson.
+plocate parts and modifications are licensed under the GPLv2 or, at your option,
+any later version.
+*/
+
+#include "lib.h"
+
+#include "db.h"
+#include "error.h"
+
+#include <algorithm>
+#include <arpa/inet.h>
+#include <assert.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+using namespace std;
+
+/* Compare two path names using the database directory order. This is not
+   exactly strcmp () order: "a" < "a.b", so "a/z" < "a.b". */
+int dir_path_cmp(const string &a, const string &b)
+{
+       auto [ai, bi] = mismatch(a.begin(), a.end(), b.begin(), b.end());
+       if (ai == a.end() && bi == b.end()) {
+               return 0;
+       }
+       if (ai == a.end()) {
+               return -1;
+       }
+       if (bi == b.end()) {
+               return 1;
+       }
+       if (*ai == *bi) {
+               return 0;
+       }
+       if (*ai == '/') {
+               return -1;
+       }
+       if (*bi == '/') {
+               return 1;
+       }
+       return int((unsigned char)*ai) - int((unsigned char)*bi);
+}
+
+/* Sort LIST using dir_path_cmp () */
+void string_list_dir_path_sort(vector<string> *list)
+{
+       sort(list->begin(), list->end(), [](const string &a, const string &b) {
+               return dir_path_cmp(a, b) < 0;
+       });
+}
+
+/* Is PATH included in LIST?  Update *IDX to move within LIST.
+
+   LIST is assumed to be sorted using dir_path_cmp (), successive calls to this
+   function are assumed to use PATH values increasing in dir_path_cmp (). */
+bool string_list_contains_dir_path(const vector<string> *list, size_t *idx,
+                                   const string &path)
+{
+       int cmp = 0;
+       while (*idx < list->size() && (cmp = dir_path_cmp((*list)[*idx], path)) < 0) {
+               (*idx)++;
+       }
+       if (*idx < list->size() && cmp == 0) {
+               (*idx)++;
+               return true;
+       }
+       return false;
+}