Implement a minimalist 'last' which allows the LEAF project to

no longer need dumtp.  Remove the 'dumtp' applet.
 -Erik


git-svn-id: svn://busybox.net/trunk/busybox@7188 69ca8d6d-28ef-0310-b511-8ec308f3f277

1 files changed, 107 insertions, 0 deletions

diff --git a/miscutils/last.c b/miscutils/last.c
new file mode 100644
index 000000000..e7f9eb57a
--- /dev/null
+++ b/miscutils/last.c
@@ -0,0 +1,107 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * last implementation for busybox
+ *
+ * Copyright (C) 2003  Erik Andersen <andersen@codepoet.org>
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <utmp.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <string.h>
+#include <time.h>
+#include "busybox.h"
+
+#ifndef SHUTDOWN_TIME
+#  define SHUTDOWN_TIME 254
+#endif
+
+/* Grr... utmp char[] members  do not have to be nul-terminated.
+ * Do what we can while still keeping this reasonably small.
+ * Note: We are assuming the ut_id[] size is fixed at 4. */
+
+#if (UT_LINESIZE != 32) || (UT_NAMESIZE != 32) || (UT_HOSTSIZE != 256)
+#error struct utmp member char[] size(s) have changed!
+#endif
+
+extern int last_main(int argc, char **argv)
+{
+        struct utmp ut;
+        int n, file = STDIN_FILENO;
+
+        if (argc > 1) {
+                bb_show_usage();
+        }
+        file = bb_xopen(_PATH_WTMP, O_RDONLY);
+
+        printf("%-10s %-14s %-18s %-12.12s %s\n", "USER", "TTY", "HOST", "LOGIN", "TIME");
+        while ((n = safe_read(file, (void*)&ut, sizeof(struct utmp))) != 0) {
+
+                if (n != sizeof(struct utmp)) {
+                        bb_perror_msg_and_die("short read");
+                }
+
+                if (strncmp(ut.ut_line, "~", 1) == 0) {
+                        if (strncmp(ut.ut_user, "shutdown", 8) == 0)
+                                ut.ut_type = SHUTDOWN_TIME;
+                        else if (strncmp(ut.ut_user, "reboot", 6) == 0)
+                                ut.ut_type = BOOT_TIME;
+                        else if (strncmp(ut.ut_user, "runlevel", 7) == 0)
+                                ut.ut_type = RUN_LVL;
+                } else {
+                        if (!ut.ut_name[0] || strcmp(ut.ut_name, "LOGIN") == 0 || 
+                                        ut.ut_name[0] == 0)
+                        {
+                                /* Don't bother.  This means we can't find how long 
+                                 * someone was logged in for.  Oh well. */
+                                continue;
+                        }
+                        if (ut.ut_type != DEAD_PROCESS &&
+                                        ut.ut_name[0] && ut.ut_line[0])
+                        {
+                                ut.ut_type = USER_PROCESS;
+                        }
+                        if (strcmp(ut.ut_name, "date") == 0) {
+                                if (ut.ut_line[0] == '|') ut.ut_type = OLD_TIME;
+                                if (ut.ut_line[0] == '{') ut.ut_type = NEW_TIME;
+                        }
+                }
+
+                if (ut.ut_type!=USER_PROCESS) {
+                        switch (ut.ut_type) {
+                                case OLD_TIME:
+                                case NEW_TIME:
+                                case RUN_LVL:
+                                case SHUTDOWN_TIME:
+                                        continue;
+                                case BOOT_TIME:
+                                        strcpy(ut.ut_line, "system boot");
+                                        break;
+                        }
+                }
+
+                printf("%-10s %-14s %-18s %-12.12s\n", ut.ut_user, ut.ut_line, ut.ut_host,
+                                ctime(&(ut.ut_tv.tv_sec)) + 4);
+        }
+
+        bb_fflush_stdout_and_exit(EXIT_SUCCESS);
+}