Adding upstream version 9.4.upstream/9.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 148 insertions, 0 deletions

diff --git a/src/users.c b/src/users.c
new file mode 100644
index 0000000..f89fe65
--- /dev/null
+++ b/src/users.c
@@ -0,0 +1,148 @@
+/* GNU's users.
+   Copyright (C) 1992-2023 Free Software Foundation, Inc.
+
+   This program 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 3 of the License, or
+   (at your option) any later version.
+
+   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, see <https://www.gnu.org/licenses/>.  */
+
+/* Written by jla; revised by djm */
+
+#include <config.h>
+#include <stdio.h>
+
+#include <sys/types.h>
+#include "system.h"
+
+#include "long-options.h"
+#include "quote.h"
+#include "readutmp.h"
+
+/* The official name of this program (e.g., no 'g' prefix).  */
+#define PROGRAM_NAME "users"
+
+#define AUTHORS \
+  proper_name ("Joseph Arceneaux"), \
+  proper_name ("David MacKenzie")
+
+static int
+userid_compare (const void *v_a, const void *v_b)
+{
+  char **a = (char **) v_a;
+  char **b = (char **) v_b;
+  return strcmp (*a, *b);
+}
+
+static void
+list_entries_users (idx_t n, struct gl_utmp const *this)
+{
+  char **u = xinmalloc (n, sizeof *u);
+  idx_t i;
+  idx_t n_entries = 0;
+
+  while (n--)
+    {
+      if (IS_USER_PROCESS (this))
+        {
+          char *trimmed_name;
+
+          trimmed_name = extract_trimmed_name (this);
+
+          u[n_entries] = trimmed_name;
+          ++n_entries;
+        }
+      this++;
+    }
+
+  qsort (u, n_entries, sizeof (u[0]), userid_compare);
+
+  for (i = 0; i < n_entries; i++)
+    {
+      char c = (i < n_entries - 1 ? ' ' : '\n');
+      fputs (u[i], stdout);
+      putchar (c);
+    }
+
+  for (i = 0; i < n_entries; i++)
+    free (u[i]);
+  free (u);
+}
+
+/* Display a list of users on the system, according to utmp file FILENAME.
+   Use read_utmp OPTIONS to read FILENAME.  */
+
+static void
+users (char const *filename, int options)
+{
+  idx_t n_users;
+  struct gl_utmp *utmp_buf;
+  options |= READ_UTMP_USER_PROCESS;
+  if (read_utmp (filename, &n_users, &utmp_buf, options) != 0)
+    error (EXIT_FAILURE, errno, "%s", quotef (filename));
+
+  list_entries_users (n_users, utmp_buf);
+
+  free (utmp_buf);
+}
+
+void
+usage (int status)
+{
+  if (status != EXIT_SUCCESS)
+    emit_try_help ();
+  else
+    {
+      printf (_("Usage: %s [OPTION]... [FILE]\n"), program_name);
+      printf (_("\
+Output who is currently logged in according to FILE.\n\
+If FILE is not specified, use %s.  %s as FILE is common.\n\
+\n\
+"),
+              UTMP_FILE, WTMP_FILE);
+      fputs (HELP_OPTION_DESCRIPTION, stdout);
+      fputs (VERSION_OPTION_DESCRIPTION, stdout);
+      emit_ancillary_info (PROGRAM_NAME);
+    }
+  exit (status);
+}
+
+int
+main (int argc, char **argv)
+{
+  initialize_main (&argc, &argv);
+  set_program_name (argv[0]);
+  setlocale (LC_ALL, "");
+  bindtextdomain (PACKAGE, LOCALEDIR);
+  textdomain (PACKAGE);
+
+  atexit (close_stdout);
+
+  parse_gnu_standard_options_only (argc, argv, PROGRAM_NAME, PACKAGE_NAME,
+                                   Version, true, usage, AUTHORS,
+                                   (char const *) nullptr);
+
+  switch (argc - optind)
+    {
+    case 0:			/* users */
+      users (UTMP_FILE, READ_UTMP_CHECK_PIDS);
+      break;
+
+    case 1:			/* users <utmp file> */
+      users (argv[optind], 0);
+      break;
+
+    default:			/* lose */
+      error (0, 0, _("extra operand %s"), quote (argv[optind + 1]));
+      usage (EXIT_FAILURE);
+    }
+
+  return EXIT_SUCCESS;
+}