initctl: Break out UTMP logic to separate file

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

utmp-api.c

@@ -0,0 +1,67 @@
+/* UTMP API
+ *
+ * Copyright (c) 2016  Joachim Nilsson <troglobit@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <time.h>
+#include <utmp.h>
+
+int utmp_show(char *file)
+{
+	time_t sec;
+	struct utmp *ut;
+	struct tm *sectm;
+
+	int pid;
+	char id[sizeof(ut->ut_id)], user[sizeof(ut->ut_user)], when[80];
+
+	printf("%s =============================================================================================\n", file);
+	utmpname(file);
+
+	setutent();
+	while ((ut = getutent())) {
+		memset(id, 0, sizeof(id));
+		strncpy(id, ut->ut_id, sizeof(ut->ut_id));
+
+		memset(user, 0, sizeof(user));
+		strncpy(user, ut->ut_user, sizeof(ut->ut_user));
+
+		sec = ut->ut_tv.tv_sec;
+		sectm = localtime(&sec);
+		strftime(when, sizeof(when), "%F %T", sectm);
+
+		pid = ut->ut_pid;
+
+		printf("[%d] [%05d] [%-4.4s] [%-8.8s] [%-12.12s] [%-20.20s] [%-15.15s] [%-19.19s]\n",
+		       ut->ut_type, pid, id, user, ut->ut_line, ut->ut_host, "0.0.0.0", when);
+	}
+	endutent();
+
+	return 0;
+}
+
+/**
+ * Local Variables:
+ *  indent-tabs-mode: t
+ *  c-file-style: "linux"
+ * End:
+ */